CN111682325A

CN111682325A - Terminal assembly

Info

Publication number: CN111682325A
Application number: CN202010363200.9A
Authority: CN
Inventors: 李海; 熊欣; 李克飞; 程旎; 曾庆威; 马平安
Original assignee: Wuhan Marine Machinery Plant Co Ltd
Current assignee: Wuhan Marine Machinery Plant Co Ltd
Priority date: 2020-04-30
Filing date: 2020-04-30
Publication date: 2020-09-18
Anticipated expiration: 2040-04-30
Also published as: CN111682325B

Abstract

The utility model provides a binding post subassembly relates to electrical equipment technical field. The wiring terminal assembly comprises a wiring terminal, a gasket and a fastening nut. The connecting piece is connected to one end of the connecting tube and provided with a first surface and a second surface which are opposite to each other, the bimetallic strips are installed on one of the first surface and the second surface and arranged around a first installation hole of the connecting piece, the bimetallic strips comprise a first metal layer and a second metal layer which are arranged in a stacked mode, and the first metal layer is located between the second metal layer and the connecting piece. The gasket and the bimetallic strip are positioned on the same side of the connecting sheet, and the fastening nut is used for pressing the gasket on the connecting sheet. The wiring terminal assembly can ensure that the wiring terminal assembly is fixedly connected with an external conductor of electric equipment, and the phenomenon of poor contact is avoided.

Description

Terminal assembly

Technical Field

The present disclosure relates to electrical devices, and more particularly, to a terminal assembly.

Background

A terminal is an element provided at an end of a wire in an electrical apparatus for connecting a terminal. The terminal generally includes a contact tube and a tab disposed at one end of the contact tube, both the contact tube and the tab being made of a metallic material. When the wire clamp is used, one end of a wire is inserted into the wiring tube, the wiring tube deforms under the action of the wire clamp to clamp the wire in the wiring tube, and the connecting sheet is connected with the wiring terminal of the electrical equipment, so that the electric connection between the wiring terminal and the wire is realized.

In the related art, in order to secure the connection of the connection terminal to the terminal post, the connection piece of the connection terminal is usually fixedly connected to the terminal post of the electrical device by a nut.

Electrical equipment is in the circular telegram use, and electrical equipment's terminal and binding post's the connection position of connection piece are through producing the heat because of the electric current, and the connection piece can be heated and produce the inflation, and when electrical equipment closed, refrigerated connection piece can produce the shrink again, and the expend with heat and contract with cold of connection piece can lead to the connection of connection piece and terminal not hard up, produces contact failure, influences electrical equipment's normal work.

Disclosure of Invention

The embodiment of the disclosure provides a wiring terminal assembly, which can ensure that the wiring terminal assembly and a wiring terminal of electric equipment are kept in fastening connection, and the phenomenon of poor contact is avoided. The technical scheme is as follows:

the disclosed embodiment provides a binding post subassembly, includes:

a connecting terminal, a gasket and a fastening nut,

the connecting terminal comprises a connecting tube, a connecting piece and a plurality of bimetallic strips, wherein the connecting piece is connected to one end of the connecting tube, the connecting piece is provided with a first surface and a second surface which are opposite, and a first mounting hole which is used for being sleeved on the connecting terminal, and the first mounting hole is communicated with the first surface and the second surface;

the bimetallic strips are arranged on one of the first surface and the second surface and distributed around the first mounting hole, each bimetallic strip comprises a first metal layer and a second metal layer which are arranged in a stacked mode, the first metal layer is located between the second metal layer and the connecting piece, and the coefficient of thermal expansion of the first metal layer is larger than that of the second metal layer;

the gasket is provided with a second mounting hole which is sleeved on the wiring terminal, and the gasket and the bimetallic strip are positioned on the same side of the connecting sheet;

the fastening nut is used for being connected with the wiring terminal and pressing the gasket on the connecting piece.

Optionally, the plurality of bimetal strips are arranged at equal angular intervals around the first mounting hole.

Optionally, the connecting piece has a plurality of mounting grooves, and the plurality of bimetallic strips are mounted in the mounting grooves in a one-to-one correspondence manner.

Optionally, the connecting piece has an outer side surface connecting the first surface and the second surface, and the mounting groove is communicated with the outer side surface.

Optionally, the thickness of the bimetal in the axial direction of the connecting piece is smaller than the depth of the mounting groove in the axial direction of the connecting piece.

Optionally, the first metal layer is connected to the connecting piece in a welding manner at a middle portion in a radial direction of the first mounting hole.

Optionally, the length direction of the bimetallic strip is arranged along the radial direction of the first mounting hole, and the middle part of the first metal layer is connected with the connecting piece in the width direction of the bimetallic strip.

Optionally, the partition plate and the axis of the cylinder are arranged at an acute angle, and in the axis direction of the cylinder, the distance between the plate surface of the partition plate and the plane where the connecting sheet is located gradually increases.

Optionally, the partition plate is provided with a viewing hole communicated with the cylinder.

Optionally, the terminal is a copper structural member.

The beneficial effects brought by the technical scheme provided by the embodiment of the disclosure at least comprise:

the gasket, the wiring terminal and the external conductor are fixedly connected through the fastening nut, opposite two side faces of a connecting piece of the wiring terminal are respectively attached to the gasket and the wiring terminal of the external conductor, the bimetallic strip is arranged on the side face, opposite to the gasket, of the connecting piece in a surrounding mode through the first mounting hole, and the first metal layers of the bimetallic strips are located between the second metal layers and the connecting piece. When the electrical equipment connected with the external conductor works in a power-on mode, the connecting sheet of the wiring terminal is heated and expanded due to the heat generated by current passing, when the electrical equipment does not work, the connecting sheet can be cooled and contracted, when the expansion and contraction of the connecting sheet cause the situation that the connecting sheet and the external conductor cannot be normally attached due to the gap, the bimetallic strip can absorb the current and generate bending deformation to one side of the gasket through the generated heat and offset with the gasket, the stress opposite to the connecting sheet is given and the connecting sheet is pushed to move towards the direction far away from the gasket, the connecting sheet is attached to the wiring terminal of the external conductor again, the automatic compensation of the gap is realized, the wiring terminal assembly is ensured to be kept in fastening connection with the surface of the external conductor of the electrical equipment, and the phenomenon of poor contact is avoided.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a cross-sectional view of a terminal assembly according to an embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram of a connecting sheet according to an embodiment of the disclosure;

fig. 3 is a partially enlarged schematic view illustrating a normal operation of a connection terminal according to an embodiment of the disclosure;

fig. 4 is a partially enlarged schematic view of a terminal provided in an embodiment of the disclosure in a heat-generating state;

fig. 5 is a schematic view of a connection structure of a terminal assembly and an external conductor with a gap according to an embodiment of the disclosure;

fig. 6 is a schematic view of a connection structure of a terminal assembly according to an embodiment of the present disclosure, which realizes automatic compensation;

FIG. 7 is a cross-sectional view of a wire barrel according to an embodiment of the present disclosure;

fig. 8 is a flowchart of a wiring method provided by an embodiment of the present disclosure.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

Fig. 1 is a structural sectional view of a terminal assembly according to an embodiment of the present disclosure. As shown in fig. 1, the terminal assembly includes: a terminal 1, a washer 2 and a fastening nut 3. Wherein,

the terminal 1 includes a connecting tube 11, a connecting piece 12 and a plurality of bimetal strips 13, the connecting piece 12 is connected to one end of the connecting tube 11, the connecting piece 12 has a first surface 121 and a second surface 122 which are opposite, and a first mounting hole 12a for being sleeved on a terminal m1, and the first mounting hole 12a communicates the first surface 121 and the second surface 122.

Fig. 2 is a schematic structural diagram of a connecting sheet according to an embodiment of the disclosure. As shown in fig. 1 and 2, a plurality of bimetal strips 13 are mounted on one of the first surface 121 and the second surface 122, and the plurality of bimetal strips 13 are distributed around the first mounting hole 12a, the bimetal strips 13 include a first metal layer 131 and a second metal layer 132 which are stacked, the first metal layer 131 is located between the second metal layer 132 and the connecting piece 12, and the first metal layer 131 has a thermal expansion coefficient greater than that of the second metal layer 132.

The spacer 2 is provided with a second mounting hole 21 which is sleeved on the terminal m1, and the spacer 2 and the bimetallic strip 13 are positioned on the same side of the connecting piece 12. The fastening nut 3 is used to connect with the post m1, and press the gasket 2 against the connecting piece 12.

In the disclosed embodiment, the terminal assembly is used for connecting the wire n and the post m1 of the external conductor m, which are independent of each other. Wherein, binding post 1 includes wire barrel 11, and through inserting wire n's one end in wire barrel 11's the body, rethread wire pressing pliers presss from both sides tightly wire barrel 11's outer wall, makes wire barrel 11's body take place to deform and compresses tightly fixedly wire n who inserts in the body, realizes wire n and binding post 1's being connected. A plurality of bimetal strips 13 are arranged around the first mounting hole 12a on one of the first surface 121 and the second surface 122 of the connecting plate 12, which are opposite and parallel to each other, the bimetal strips 13 include a first metal layer 131 with a larger expansion coefficient and a second metal layer 132 with a smaller expansion coefficient, wherein the first metal layer 131 and the connecting plate 12 are fixedly mounted on the connecting plate. Illustratively, the bimetal 13 of the present disclosure is mounted on the first surface 121 for illustrative purposes.

Fig. 3 is a partially enlarged schematic view illustrating a normal operation of a connection terminal according to an embodiment of the disclosure. Fig. 4 is a partially enlarged schematic view of a terminal in a heat-generating state according to an embodiment of the disclosure. As shown in fig. 3 and 4, the bimetal 13 is also called a thermal bimetal, and because the thermal expansion coefficients of the constituent layers are different, when the temperature changes, the deformation of the first metal layer is larger than that of the second metal layer, so that the whole bimetal bends toward the second metal layer, and the curvature of the composite material changes to generate deformation. Among them, the layer with a higher expansion coefficient is called an active layer, and the layer with a lower expansion coefficient is called a passive layer. In the embodiment of the disclosure, the first metal layer 131 is located between the second metal layer 132 and the first surface 121 of the connection pad 12, and since the expansion coefficient of the first metal layer 131 is greater than that of the second metal layer 132, that is, the first metal layer 131 is an active layer, and the second metal layer 132 is a passive layer. When the bimetal 13 on the connecting plate 12 is heated, the whole bimetal 13 bends and deforms toward the second metal layer 132 side, i.e. the direction away from the first surface 121.

Referring to fig. 1 again, in the embodiment of the present disclosure, the connecting pad 12 is sleeved on the post m1 of the external conductor m through the first mounting hole 12a, the connecting pad 12 is attached to a side surface of the external conductor m through the second surface 122, and the gasket 2 is sleeved on the post m1 through the second mounting hole 21 and is located on a side where the first surface 121 of the connecting pad 12 is located. When being connected wire n and external conductor m through binding post subassembly electricity, fastening nut 3 is connected with terminal m1, compresses tightly gasket 2 on connection piece 12 through screwing up fastening nut 3, with gasket 2, connection piece 12 and external conductor m fixed connection in proper order, and a plurality of bimetallic strips 13 are located between gasket 2 and the first surface 121 of connection piece 12.

Fig. 5 is a schematic view of a connection structure in which a gap occurs between a terminal assembly and an external conductor according to an embodiment of the disclosure. As shown in fig. 5, in the power-on use process of the electrical device connected with the external conductor m, the connection portion of the connection piece 12 and the terminal m1 generates heat due to the passing of current, the connection piece 12 is heated to expand, and when the electrical device is closed, the cooled connection piece 12 contracts again, and the expansion caused by heat and the contraction caused by cold of the connection piece 12 cause the gap to occur in the fastening connection between the second surface 122 and the external conductor m, so that the fastening connection is loosened.

Fig. 6 is a schematic view of a connection structure of a terminal assembly according to an embodiment of the present disclosure, which realizes automatic compensation. As shown in fig. 6, when a gap occurs between the pad 2, the connecting sheet 12 and the external conductor m, which causes the second surface 122 of the connecting sheet 12 not to be normally attached to the external conductor m, the resistance between the connection terminal 1 and the external conductor m increases due to poor contact, the temperature of the connecting sheet 12 is correspondingly increased in the energized state, and at this time, the temperature of the plurality of bimetallic strips 13 mounted on the first surface 121 also increases, because the thermal expansion coefficient of the first metal layer 131 connected to the first side surface 121 is greater than that of the second metal layer 132 away from the first surface 121, the whole bimetallic strip 13 bends and deforms toward the second metal layer 132 side, i.e. the direction away from the first surface 121, and the bent and deformed bimetallic strip 13 abuts against the pad 2 and applies a stress opposite to the first surface 121, so that the connecting sheet 12 moves toward the direction away from the pad 2, and the second surface 122 is attached to the external conductor m again, the terminal 1 is brought back into good contact with the external conductor m.

According to the wiring terminal assembly provided by the embodiment of the disclosure, the gasket, the wiring terminal and the external conductor are fixedly connected through the fastening nut, so that two opposite side surfaces of the connecting sheet of the wiring terminal are respectively attached to the gasket and the wiring terminal of the external conductor, the bimetallic strip is arranged around the first mounting hole on the side surface, opposite to the gasket, of the connecting sheet, and the first metal layers of the bimetallic strips are located between the second metal layer and the connecting sheet. When the electrical equipment connected with the external conductor works in a power-on mode, the connecting sheet of the wiring terminal is heated and expanded due to the heat generated by current passing, when the electrical equipment does not work, the connecting sheet can be cooled and contracted, when the expansion and contraction of the connecting sheet cause the situation that the connecting sheet and the external conductor cannot be normally attached due to the gap, the bimetallic strip can absorb the current and generate bending deformation to one side of the gasket through the generated heat and offset with the gasket, the stress opposite to the connecting sheet is given and the connecting sheet is pushed to move towards the direction far away from the gasket, the connecting sheet is attached to the wiring terminal of the external conductor again, the automatic compensation of the gap is realized, the wiring terminal assembly is ensured to be kept in fastening connection with the surface of the external conductor of the electrical equipment, and the phenomenon of poor contact is avoided.

For example, in the embodiment of the present disclosure, the first metal layer 131 of the bimetal 13 may use a metal material having a larger coefficient of thermal expansion, such as nickel-manganese-copper alloy, and the second metal layer 132 may use a metal material having a smaller coefficient of thermal expansion relative to the first metal layer 131, such as nickel-iron alloy. As long as the whole of the bimetal 13 can be bent and deformed to the side of the gasket 2 when heated, the specific material of the bimetal 13 is not limited in the embodiment of the present disclosure.

Exemplarily, in the embodiment of the present disclosure, after the gasket 2 and the connecting sheet 12 are both sleeved on the post m1 of the external conductor m, the gasket 2 is pressed on the connecting sheet 12 by using the fastening nut 3 for locking, and the connecting strength is high and is not easy to loosen. When the staff is in maintenance and inspection of the wiring terminal assembly, if a loose gap occurs between the connecting sheet 12 and the external conductor m, the fastening connection between the wiring terminal 1 and the external conductor m can be realized only by screwing the fastening nut 3, and the structure is simple and the maintenance is convenient.

Alternatively, as shown in fig. 2 and 3, the length direction of the bimetal 13 is arranged in the radial direction of the first mounting hole 12a, and the middle of the first metal layer 131 is connected to the connecting piece 12 in the width direction of the bimetal 13. Illustratively, in the embodiment of the present disclosure, the bimetal 13 is in a strip shape, the length direction of the bimetal is arranged along the radial direction of the first mounting hole 12a, and the middle of the first metal layer 131 of the bimetal 13 in the radial direction of the first mounting hole 12a, that is, the middle area of the first metal layer 131 in the length direction is fixedly connected with the first surface 121 of the connecting piece 12 by spot welding in the width direction of the bimetal 13. When the bimetal 13 is heated and expanded, because only the middle part of the first metal layer 131 is fixedly connected with the first surface 121, the end faces of the two opposite side surfaces of the bimetal 13 in the length direction can be tilted towards the gasket 2 and are symmetrically abutted against the gasket 2, so that the support of the bimetal 13 on the gasket 2 is more stable, and the second side surface 122 of the connecting terminal 12 is ensured to be stably contacted with the surface of the external conductor m.

Optionally, the connecting piece 12 has an outer side 124 connecting the first surface 121 and the second surface 122, and the mounting groove 123 is communicated with the outer side 124. The bimetal 13 may be broken by metal fatigue after being deformed many times after being used for a long time and may not be restored. At this time, it is necessary to remove the broken bimetal 13 and weld a new bimetal 13 in the mounting groove 123, and since the connection form of connecting the first metal layer 131 of the bimetal 13 to the connecting piece 12 by welding in the middle of the first mounting hole 12a in the radial direction is adopted in the embodiment of the present disclosure, it is difficult for the welding gun to directly extend into the first metal layer 131 from above the mounting groove 123 and the bottom of the mounting groove 123 for welding. Through communicating mounting groove 123 with the lateral surface 124 of connection piece 12, when welding first metal level 131 and the tank bottom of mounting groove 123, welder can directly stretch into mounting groove 123 by one side of the lateral surface 124 of connection piece and weld, and simple structure facilitates the processing, has improved the maintenance efficiency to the terminal subassembly of binding post.

Alternatively, a plurality of bimetal strips 13 are arranged at equal angular intervals around the first mounting hole 12 a. If a plurality of bimetallic strips 13 are simply arranged on the first surface 121 around the first mounting hole 12a, when the areas of the first surface 121 and the second surface 122 of the connecting strip are large, the bimetallic strips 13 are prone to pushing the connecting strip 12 out of place, so that only a partial area of the second surface 122 is brought back into contact with the terminal of the external conductor m, and the phenomenon of poor contact between the terminal and the external conductor m may still exist. In the embodiment of the present disclosure, the connecting sheet 12 is circular, 6 bimetallic strips 13 are arranged around the first mounting hole 12a at equal angular intervals, in the circumferential direction of the connecting sheet 12, the included angle between two adjacent bimetallic strips 13 is 60 °, when the connecting sheet 12, the gasket 2 and the external conductor m have a gap, the 6 bimetallic strips 13 are heated simultaneously and are bent to deform to abut against the gasket 2, the connecting sheet 12 is supported at multiple points in the circumferential direction of the connecting sheet 12, the stress on the first surface 121 of the connecting sheet 12 is more uniform, the whole area of the second surface 122 of the connecting sheet 12 can be moved towards the direction of the external conductor m and is restored to contact with the side face of the terminal of the external conductor m, and the possibility of poor contact between the terminal and the external conductor is further reduced.

Alternatively, the connecting piece 12 has a plurality of mounting grooves 123 thereon, and the plurality of bimetal pieces 13 are mounted in the mounting grooves 123 in a one-to-one correspondence. If the plurality of bimetal strips 13 are directly arranged on the first surface 121 of the connecting piece 12, since the bimetal strips 13 themselves have a certain thickness, when the gasket 2, the connecting piece 12 and the surface of the external conductor m are fixedly connected by the fastening nut 3, a certain gap inevitably exists between the gasket 2 and the first surface 121 of the connecting piece 12, which is not favorable for good contact between the connection terminal 1 and the external conductor m. In the embodiment of the present disclosure, by providing a plurality of mounting grooves 123 on the connecting piece 12, the plurality of mounting grooves 123 are arranged on the first surface 121 at even intervals around the circumference of the first mounting hole 12a, and each mounting groove 123 corresponds to one bimetal 13. Through installing a plurality of bimetallic strips 13 in mounting groove 123 one-to-one, can effectively reduce the clearance length between the first surface 121 of connecting piece 12 and gasket 2 when fastening connection, further reduce the possibility that contact failure takes place between binding post and the external conductor.

Alternatively, the thickness of the bimetal 13 in the axial direction of the connecting piece 12 is smaller than the depth of the mounting groove 123 in the axial direction of the connecting piece 12. Exemplarily, in the embodiment of the present disclosure, the depth of the mounting groove 123 is greater than the thickness of the bimetal 13 in the axial direction of the connecting piece 12. When the wiring terminal 1 is not used or is disassembled for repair and maintenance, the thickness of the bimetallic strip 13 arranged in the mounting groove 123 is smaller than the depth of the mounting groove 123 in the axial direction of the connecting piece 12, so that the bimetallic strip 13 can be prevented from being scratched with the gasket 2 or other external objects, and the service life of the wiring terminal assembly is prolonged.

FIG. 7 is a cross-sectional view of a wire barrel according to an embodiment of the present disclosure. As shown in fig. 7, the wire barrel 11 includes a barrel 111 and a spacer 112, and the spacer 112 is attached to an end of the barrel 111 near the connection piece 12. When inserting one end of a wire n into a barrel 11, a worker usually holds a connecting piece 12 connected to one end of the barrel 11 with one hand and inserts the exposed end of the wire n into the barrel 11 with the other hand. Since the length of the wire barrel 11 is limited, if the length of the wire n inserted is too long, a situation may occur in which one end of the wire n scratches the hand of the worker. In the embodiment of the disclosure, the partition plate 112 is arranged at one end, close to the connecting sheet 12, of the cylinder body 111 of the wire connecting tube 11, and the cylinder body 111 is sealed by the partition plate 112, so that the lead n can be prevented from extending out of the cylinder body 111 to scratch workers, and the safety of the wire connecting terminal assembly is improved.

Optionally, the partition plate 112 is disposed at an acute angle with respect to the axis of the cylinder 111, and in the axial direction of the cylinder 111, the distance between the plate surface of the partition plate 112 and the plane where the connecting piece 12 is located gradually increases. Illustratively, in the embodiment of the present disclosure, by arranging the partition plate 112 at an acute angle with respect to the axis of the barrel 111, when the wire n extending into the barrel 111 is too long, the wire n blocked by the partition plate 112 may bend and lie in the inclined cavity formed by the partition plate 112 and the inner wall of the barrel 111, compared to the way of arranging the partition plate 112 perpendicular to the axis of the barrel 111, the partition plate 112 arranged obliquely can increase the contact area between the wire n bent and laid in the barrel 111 and the barrel 111, increase the friction force, avoid the wire n inserted into the barrel 111 from sliding when the barrel 111 and the wire n are clamped by the crimping pliers, and facilitate the improvement of the connection firmness between the wire n and the wire barrel 11.

Optionally, the partition 112 has a viewing hole 113 communicating with the cylinder 111. Exemplarily, in the embodiment of the present disclosure, by providing the observation hole 113 on the partition 112, a worker can observe whether the wire n inserted into the cylinder 111 is inserted in place or not and the plugging state through the observation hole 113. When a worker connects the wire n with the wire connecting tube 11, the inside of the insertion cylinder 111 is observed through the observation hole 113, if the wire inserted into the cylinder 111 can be observed through the observation hole 113, and the wire n inserted into the cylinder 111 is obviously blocked, the wire n is proved to have contacted with the partition plate 112, the insertion is proved to be in place, the contact area between the wire connecting tube 11 and one end of the wire n can be ensured to the maximum extent, and the connection firmness degree between the wire connecting tube 11 and the wire n is effectively ensured.

Optionally, the terminal 1 is a copper structural member. Copper has high electrical and thermal conductivity as a metal material, and has corrosion resistance, high mechanical strength, easy processing and molding, and is less expensive than other electrically conductive metal materials, such as silver. The wiring terminal 1 processed by the copper structural member can effectively reduce the production cost while ensuring the normal electric connection between the lead n and the external conductor m.

Fig. 8 is a flowchart of a wiring method provided by an embodiment of the present disclosure. As shown in fig. 8, the wiring method is implemented by using the wiring terminal assembly shown in fig. 1 to 7, and includes the following steps:

s81, a terminal assembly, an external conductor m and a wire n are provided.

The wiring assembly comprises a wiring terminal 1, a gasket 2 and a fastening nut 3, the wiring terminal 1 comprises a wiring tube 11, a connecting piece 12 and a plurality of bimetallic strips 13, the connecting piece 12 is connected to one end of the wiring tube 11, the connecting piece 12 is provided with a first surface 121 and a second surface 122 which are opposite, a first mounting hole 12a is used for being sleeved on a wiring post m1, and the first mounting hole 12a is communicated with the first surface 121 and the second surface 122. A plurality of bimetal strips 13 are mounted on one of the first surface 121 and the second surface 122, and the plurality of bimetal strips 13 are distributed around the first mounting hole 12a, the bimetal strips 13 include a first metal layer 131 and a second metal layer 132 which are stacked, the first metal layer 131 is located between the second metal layer 132 and the connecting piece 12, and the thermal expansion coefficient of the first metal layer 131 is greater than that of the second metal layer 132. The spacer 2 is provided with a second mounting hole 21 which is sleeved on the terminal m1, and the spacer 2 and the bimetallic strip 13 are positioned on the same side of the connecting piece 12. The fastening nut 3 is used to connect with the post m1, and press the gasket 2 against the connecting piece 12.

And S82, fixedly connecting the lead n with the junction tube 11.

The wire connecting tube 11 comprises a tube body 111 and a partition plate 112, an inner hole of the tube body 111 is communicated with one end, far away from the connecting piece 12, of the wire connecting tube 11, and the partition plate 112 is connected to one end, close to the connecting piece 12, of the tube body 111.

When the staff connects the wire n with the wire connecting tube 11, the staff observes the inside of the insertion cylinder 111 through the observation hole 113, if the wire inserted into the cylinder 111 can be observed through the observation hole 113 and the wire n inserted into the cylinder 111 is obviously blocked, the staff proves that the wire n contacts the partition plate 112 and is inserted in place

S83, the spacer 2 is arranged on the side of the connecting piece 12 on which the bimetal 13 is mounted.

The gasket 2 and the bimetal 13 are located on the same side of the connecting sheet 12, and both are located on the first surface 121 of the connecting sheet 12, and the second surface 122 of the connecting sheet 12 is attached to the terminal of the external conductor m.

And S84, fixedly connecting the gasket 2, the connecting sheet 12 and the external conductor m by using a fastening nut.

Wherein, through screwing up fastening nut 3 with gasket 2 compress tightly on connecting piece 12, with gasket 2, connecting piece 12 and external conductor m fixed connection in proper order.

The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.

Claims

1. A terminal assembly, comprising: a connecting terminal (1), a gasket (2) and a fastening nut (3),

the wiring terminal (1) comprises a wiring tube (11), a connecting piece (12) and a plurality of bimetallic strips (13), wherein the connecting piece (12) is connected to one end of the wiring tube (11), the connecting piece (12) is provided with a first surface (121) and a second surface (122) which are opposite, and a first mounting hole (12a) used for being sleeved on a wiring post (m1), and the first mounting hole (12a) is communicated with the first surface (121) and the second surface (122);

the bimetallic strips (13) are mounted on one of the first surface (121) and the second surface (122), the bimetallic strips (13) are distributed around the first mounting hole (12a), the bimetallic strips (13) comprise a first metal layer (131) and a second metal layer (132) which are arranged in a stacking mode, the first metal layer (131) is located between the second metal layer (132) and the connecting piece (12), and the coefficient of thermal expansion of the first metal layer (131) is larger than that of the second metal layer (132);

the gasket (2) is provided with a second mounting hole (21) sleeved on the binding post (m1), and the gasket (2) and the bimetallic strip (13) are positioned on the same side of the connecting strip (12);

the fastening nut (3) is used for being connected with the binding post (m1) and pressing the gasket (2) on the connecting sheet (12).

2. The terminal assembly according to claim 1, wherein the plurality of bimetal strips (13) are arranged at equal angular intervals around the first mounting hole (12 a).

3. The terminal assembly according to claim 2, wherein the connecting strip (12) has a plurality of mounting grooves (123) formed therein, and the plurality of bimetal strips (13) are mounted in the mounting grooves (123) in a one-to-one correspondence.

4. The terminal assembly according to claim 3, characterized in that the connecting tab (12) has an outer side face (124) connecting the first surface (121) and the second surface (122), the mounting slot (123) communicating with the outer side face (124).

5. The terminal assembly according to claim 3, wherein the thickness of the bimetal blade (13) is smaller than the depth of the mounting groove (123).

6. The terminal assembly according to claim 1, wherein the bimetal (13) has a length direction arranged in a radial direction of the first mounting hole (12a), and a middle portion of the first metal layer (131) is connected to the connecting piece (12) in a width direction of the bimetal (13).

7. A terminal assembly according to any one of claims 1 to 6, characterised in that the barrel (11) includes a barrel (111) and a spacer (112), the spacer (112) being attached to the barrel (111) at an end thereof adjacent the lug (12).

8. The terminal assembly of claim 7, wherein said septum (112) is at an acute angle to the axis of said barrel (111).

9. The terminal assembly of claim 8, wherein said spacer (112) has a sight hole (113) therein.

10. The terminal assembly according to any one of claims 1 to 6, characterized in that the terminal (1) is a copper structural part.