Terminal Blocks

Abstract

The present invention relates to the structure of a terminal block, and discloses a terminal block with reduced overall thickness. The terminal body is a combined structure, including a metal part and a shell part. The shell part includes an outer shell and an inner shell with elastic legs. The metal part includes a connecting piece and left and right wire pressing frames conductively connected by the connecting piece. The shell part is used to fix the metal part. The metal part is assembled on the inner end surface of the inner shell in the Y-axis direction and then encapsulated and fixed by the outer shell. The metal part and the inner shell, as well as the inner shell and the outer shell, are all mutually engaged along the Y-axis direction. The terminal body, the inner shell, and the outer shell are all left-right symmetrical structures with the plane passing through the Y-axis as the symmetry plane. The combination of multiple buckles ensures the close fit of the inner shell and the outer shell, ensures the fixation of the metal part, ensures the mechanical strength, saves space, saves materials, improves product safety and electrical performance, and is easy to operate and use.

Description

Technical Field

[0001] The invention relates to an improvement on the structure of a connecting terminal. Background Art

[0002] At present, the shell structure of the terminal blocks on the market is usually molded, and the metal parts used for conductive connection are fixed on the shell structure. The shell structure is usually a shell. After the metal parts are fixed on the shell, part of its surface is exposed. When installing the terminal blocks, it is necessary to distinguish the front and back sides. Once installed upside down, the metal parts of adjacent terminal blocks may contact and cause a short circuit, and the assembly efficiency is low. Moreover, the metal parts are usually fixed to the plastic parts through certain interference or interference fit. There is a stop structure only on the back of the metal, but not on the front. If the torque of the screw is too large during wiring, the metal parts will shift, causing the inner shell of the plastic parts to be easily deformed.

[0003] In order to achieve complete insulation protection for metal parts, the prior art also includes a terminal block that wraps the metal parts in an insulating shell. For example, the "terminal block with a fully symmetrical structure" authorized and announced on September 10, 2014 includes two symmetrical shells on the left and right, which are connected and formed by a cylinder on one shell and a circular hole on the other completely identical shell. In addition, in the Chinese invention patent "a terminal block" with publication number CN104022367A published on September 3, 2014, in order to solve the problem of convenient assembly, the combination of the shells is designed to be assembled and connected by Tai Chi buckles with the same left and right half shells, and the elastic legs of the shells are symmetrically arranged on the left and right shells, which simplifies the equipment and reduces costs.

[0004] The only drawback of the above structure is that the cylinder and the hole are butt-connected, and the design of the corresponding cylinder and hole requires a large space to ensure the connection strength. When the torque of the two shells connected by the Tai Chi buckle is too large, the Tai Chi buckle may break, causing the shell to deform and affecting the normal use of the terminal. To ensure that its connection strength meets the use requirements, a thicker shell is required. When used on a terminal block, the same number of terminals will take up more layout space. Summary of the invention

[0005] In order to further reduce the thickness of the terminal block to save arrangement space, or to arrange as many terminal blocks as possible in a relatively narrow arrangement space, the technical problem to be solved by the present invention is to provide a terminal block with reduced overall thickness while ensuring the strength of the terminal block by improving its combined structure, which has obvious advantages when used for terminal blocks of larger sizes.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a terminal block, the terminal body is a combined structure, including a metal part and a shell part, the shell part includes elastic legs, the shell part includes an inner shell and an outer shell for fixing the metal part, the metal part is assembled on the inner end face of the inner shell in the Y-axis direction and then encapsulated and fixed by the outer shell, and the metal part and the inner shell and the inner shell and the outer shell are mutually engaged along the Y-axis direction. The above structure improves the combination of the left and right pieces of the existing shell into an inner and outer piece combination, and the metal part is fixed in a three-dimensional direction perpendicular to each other by the inner shell and the outer shell to provide insulation protection for it. The connection between the inner shell and the outer shell is similar to the prior art, and the positioning and docking are achieved by using the snap-fit ​​structures arranged on the inner shell and the outer shell respectively and corresponding to each other. The "assembly" formed by the inner shell and the metal part can also be regarded as a snap-fit ​​structure corresponding to the "shell", thereby forming a terminal block with better connection strength.

[0007] In order to facilitate the assembly and positioning between the metal part and the inner shell, the metal part includes a connecting piece and left and right wire pressing frames conductively connected by the connecting piece, and the inner shell is correspondingly provided with a first positioning structure cooperating with the connecting piece and a first limiting structure for cooperating with the wire pressing frame. The first positioning structure and the first limiting structure are used to determine the relative position between the inner shell and the metal part on a projection plane perpendicular to the Y-axis, or to ensure the concentricity of the two in the Y-axis direction, and avoid relative rotation between the two, and combined with the snap-fit ​​structure design between the outer shell to ensure the reliability of the overall connection. The snap-fit ​​structure is similar to the mutual combination of the existing left and right shells, and is used for the interlocking positioning between the inner shell and the outer shell.

[0008] The first positioning structure is four columns arranged on the inner end surface, which are used to ensure the concentricity of the connecting piece and the inner shell in the Y-axis direction and avoid relative rotation between the two.

[0009] The first limiting structure is a wall arranged on the inner shell body and extending to the inner end surface and a rib connected to the wall, which is used to ensure the concentricity of the wire pressing frame and the inner shell in the Y-axis direction and avoid relative rotation between the two.

[0010] A first screw hole is provided at the center of the connecting piece, and the outer hole wall of the first screw hole cooperates with the hole axis of the card hole on the inner shell to increase the connection strength between the connecting piece and the inner shell. The first screw hole can be used as a connecting piece hole between adjacent connecting terminals. After the connecting piece is conductively connected, the simultaneous on and off control of multiple connecting terminals can be realized. A first operating hole corresponding to the first screw hole is provided on the outer shell for easy operation.

[0011] The left and right wire pressing frames are hollow structures with through holes. The wire pressing frames are provided with second screw holes connected to the through holes. The connecting piece is fixed on the inner end face of the second screw hole after passing through the through holes. The axis of the second screw hole is parallel to the Y axis. The through hole design is designed to facilitate the positioning of the connecting piece after insertion. The connecting piece with this design is similar to a "pole" that supports the wire pressing frames at both ends, so that the metal part has a symmetrical structure and balanced force after being fixed. The second screw hole is used to cooperate with the screw to fix the wire connected to the terminal. The housing is provided with a second operating hole corresponding to the second screw hole, which provides a certain distance of contact protection for the exposed metal part at the second screw hole without affecting the realization of its function.

[0012] As mentioned above, the metal part is assembled on the inner end surface of the inner shell in the Y-axis direction and then fixed by the outer shell. The metal part and the inner shell and the inner shell and the outer shell are mutually engaged along the Y-axis direction. In order to achieve the interlocking positioning between the inner shell and the outer shell, in addition to the inclusive relationship in the outer shape structure, at least one clamping structure is required to limit the relative displacement between the two in the Y-axis direction. Therefore, the first inner buckle is provided on the inner shell and is locked with the first outer buckle correspondingly provided on the outer shell.

[0013] The first inner buckle has elasticity in the X-axis direction perpendicular to both the Y-axis and the thickness direction of the shell portion. The elasticity allows the corresponding first outer buckle to be snapped into the first inner buckle, and after the elastic deformation of the first inner buckle is restored, the first outer buckle is locked, so that the relative displacement between the inner shell and the outer shell in the Y-axis direction is limited.

[0014] In order to relatively simplify the mold structure of the parts on the basis of achieving the purpose of the invention, the elastic legs are located on the inner shell.

[0015] The first inner component buckle is arranged at a position corresponding to the elastic leg, and the two are respectively located on both sides of a supporting plane perpendicular to the Y-axis. Then, under normal use, the pressure or tension on the elastic leg can be transmitted from the inner shell to the outer shell.

[0016] To improve the reliability of the connection, the first inner buckle is a pair of gate-shaped buckles arranged parallel to each other, and the first outer buckle is a T-shaped buckle that can be inserted into the gate-shaped buckles and limited by them.

[0017] In order to improve the reliability of the connection, a second inner buckle is arranged on the inner shell and is locked with a second outer buckle correspondingly arranged on the outer shell.

[0018] The second inner buckle has elasticity in the thickness direction of the shell part. The existence of the elasticity allows the corresponding second outer buckle to be snapped into the second inner buckle, and after the elastic deformation of the first inner buckle is restored, the second outer buckle is locked, so that the relative displacement between the inner shell and the outer shell in the Y-axis direction and the thickness direction of the shell part is limited.

[0019] To improve the reliability of the connection, the second inner buckle is a V-shaped buckle or a U-shaped buckle, and the second outer buckle is a slot into which the V-shaped buckle or the U-shaped buckle can be inserted and limit its position.

[0020] In order to improve the reliability of the connection, a third inner buckle is arranged on the inner shell and is locked with a third outer buckle correspondingly arranged on the outer shell.

[0021] The third inner component buckle is elastic in the thickness direction of the shell part, so that the inner shell and the outer shell do not rotate relative to each other, and the inner shell and the outer shell are prevented from collapsing.

[0022] The third inner component buckle is four guide grooves parallel to the Y-axis direction, and the third outer component buckle is four corresponding ribs.

[0023] The inner shell and the outer shell are both planar symmetrical structures.

[0024] At least two pairs of corresponding snap-fit ​​structures are arranged on the inner shell and the outer shell.

[0025] The inner shell and the outer shell are at least partially structured in an inside-outside containing relationship in the thickness direction of the shell portion.

[0026] The beneficial effects of the present invention are as follows: by changing the component structure of the product, the connection method of the assembly process is changed, the metal part is fixed by the inner shell and the outer shell in a three-dimensional direction that is perpendicular to each other, and the combination of multiple buckles ensures the close fit of the inner shell and the outer shell, ensures the fixation of the metal part, and is not easy to deform during use. While ensuring the mechanical strength, the product can be made thinner, saving the space occupied by the terminal block, thereby reducing the weight of the product, saving materials, and reducing pollution. In addition, since the metal parts are better protected by the shell and are not directly exposed, people can be prevented from touching the metal parts, and short-circuiting the metal parts of two adjacent terminals can be prevented, thereby improving product safety and improving the electrical performance of the product. At the same time, a planar symmetrical structure is adopted, and there is no need to distinguish between the front and back sides during assembly and product installation. The operation is simple and the efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the assembly of the wiring terminal of the present invention.

[0028] Figure 2 It is an axonometric view of the wiring terminal of the present invention.

[0029] Figure 3 It is a front view of the wiring terminal of the present invention.

[0030] Figure 4 yes Figure 3 AA section view.

[0031] Figure 5 yes Figure 3 BB cross-sectional view.

[0032] Figure 6 yes Figure 1 Axonometric view of the middle connecting piece.

[0033] Figure 7 yes Figure 1 Axonometric view of the metal part.

[0034] Figure 8 yes Figure 1 Axonometric view of the inner shell.

[0035] Fig. 9 yes Figure 1 Schematic diagram of the corresponding relationship between the medium voltage wire frame and the inner shell assembly.

[0036] Fig.10 yes Figure 1 Schematic diagram of the corresponding relationship between the middle connecting piece and the inner shell assembly.

[0037] Fig.11 yes Figure 1 Schematic diagram of the assembly relationship between the middle metal part and the inner shell.

[0038] Fig.12 yes Figure 1 Schematic diagram of the longitudinal section of the middle shell.

[0039] Fig.13 yes Figure 1 Axonometric view of the middle shell.

[0040] Fig.14 yes Figure 2 A partial schematic diagram of the engagement structure between the inner shell and the outer shell.

[0041] Markings in the figure are: 1-connecting piece, 2-wire pressing frame, 3-inner shell, 4-outer shell, 5-elastic leg, 6-screw, 11-first screw hole, 21-through hole, 22-second screw hole, 30-inner end face, 31-column, 32-wall, 33-rib, 34-first inner part buckle, 35-second inner part buckle, 36-third inner part buckle, 37-clamping hole, 38-support plane, 41-first operating hole, 42-second operating hole, 43-weight reduction hole, 44-first outer part buckle, 45-second outer part buckle, 46-third outer part buckle. DETAILED DESCRIPTION

[0042] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0043] like Figure 1 to Figure 14 As shown, the terminal block of the present invention has a terminal body of a combined structure, including a metal part and a shell part, the shell part includes an elastic leg 5, the terminal body is a left-right symmetrical structure with the plane passing through the Y-axis as the symmetry plane, the metal part includes a connecting piece 1 and left and right wire pressing frames 2 conductively connected by the connecting piece 1, the shell part includes an inner shell 3 and an outer shell 4 for fixing the metal part, the metal part is assembled on the inner end face 30 of the inner shell 3 in the Y-axis direction and then encapsulated and fixed by the outer shell 4, the metal part and the inner shell 3 as well as the inner shell 3 and the outer shell 4 are mutually engaged along the Y-axis direction, and the positioning and fixation between the components are achieved by arranging corresponding snap-fit ​​structures on the metal part and the inner shell 3 and the outer shell 4.

[0044] Since the inner shell 3 and the outer shell 4 are at least partially structured in an inner and outer containing relationship in the thickness direction of the shell part, the overall mechanical strength is increased, so that the overall product can be made thinner, achieving the purpose of the present invention. At the same time, the inner shell 3 and the outer shell 4 are both plane symmetrical structures, which are very convenient to assemble, and there is no need to distinguish the front and back during installation. The snap-fit ​​structure for interlocking the inner shell 3 and the outer shell 4 is also arranged symmetrically on the left and right, so that the inner shell 3 and the outer shell 4 are balancedly fixed to each other, so that the metal part is reliably fixed in the shell part.

[0045] like Figure 1 to Figure 14 As shown, the specific arrangement position and shape of the snap-fit ​​structure can be designed in a variety of ways. At least one pair of snap-fit ​​structures is used to limit the movement of the inner shell 3 and the outer shell 4 in the Y-axis direction. In addition, at least one pair of snap-fit ​​structures is designed to limit the mutual movement of the inner shell 3 and the outer shell 4 in at least one direction of the X-axis direction or the thickness direction of the shell part (i.e., the Z-axis direction). The snap-fit ​​structures are used together to limit the inner shell 3 and the outer shell 4 from mutual movement in the Y-axis direction, the X-axis direction, and the Z-axis direction, so as to achieve the purpose of locking the positional relationship between the components such as the connecting piece 1, the wire pressing frame 2, the inner shell 3, and the outer shell 4.

[0046] In order to relatively simplify the mold structure of the parts on the basis of achieving the purpose of the invention, it is not recommended to design the inner shell to be completely covered by the outer shell, but to set the elastic legs 5 that are usually present in the terminals on the inner shell 3. The elastic legs 5 are used to regularly arrange and fix multiple identical terminals on the same track to form a terminal row.

[0047] Example:

[0048] like Figure 1 to Figure 14As shown, the terminal block of the present invention is a combined structure including a metal part and a shell part, wherein the metal part is composed of a connecting piece 1 and two left and right wire pressing frames 2 conductively connected by the connecting piece 1, and the shell part is composed of an inner shell 3 and an outer shell 4, wherein an elastic leg 5 is arranged on the inner shell 3, and the terminal body is a structure that is symmetrical in the left and right and also symmetrical in the front and back with two mutually perpendicular planes passing through the Y axis as symmetry planes, and the shell part is used to fix the metal part. For the convenience of description, the thickness direction of the shell part is defined as the Z axis direction, and the direction perpendicular to both the Y axis and the Z axis is the X axis direction.

[0049] Specifically, the metal part is assembled on the inner end surface 30 of the inner shell 3 in the Y-axis direction and then encapsulated and fixed by the outer shell 4. The assembly sequence is used to guide and limit the design of the snap-fit ​​structure or positioning structure and limiting structure provided between the corresponding parts. The metal part and the inner shell 3, as well as the inner shell 3 and the outer shell 4, are all engaged with each other along the Y-axis direction. The inner shell 3 is provided with four columns 31 arranged on the inner end face 30 to cooperate with the connecting piece 1 as a first positioning structure. In the X-axis direction and the Z-axis direction, the connecting piece 1 cannot move relative to the inner shell 3 to prevent the metal part from falling off the inner shell 3 and preventing it from rotating. The inner shell 3 is also provided with a wall 32 arranged on the inner shell body and extending to the inner end face 30 and a rib 33 connected to the wall 32 to cooperate with the wire pressing frame 2 as a first limiting structure. The wall 32 has two pieces that are opposite and parallel to each other. The ribs 33 are distributed on both sides of the wall 32 and are located on the inner side of the opposite wall 32. The wall 32 limits the movement of the wire pressing frame 2 relative to the inner shell 3 in the Z-axis direction. The ribs 33 limit the movement of the wire pressing frame 2 relative to the inner shell 3 in the X-axis direction, and at the same time ensure that the position of the second screw hole 22 on the wire pressing frame 2 is accurate.

[0050] like Figure 1 and Figure 6 , Figure 7As shown, a first screw hole 11 is provided at the center of the connecting piece 1, and the wire pressing frame 2 is a hollow structure with a through hole 21. A second screw hole 22 connected to the through hole 21 is arranged on the wire pressing frame 2, and the second screw hole 22 is used to cooperate with the screw 6 to fix the wire connected to the terminal. The axes of the first screw hole 11 and the second screw hole 22 are parallel to the Y axis. After passing through the through hole 21, the connecting piece 1 is fixed on the inner end face of the second screw hole 22. The purpose of designing the through hole 21 is to facilitate the positioning of the connecting piece after insertion. The connecting piece with this design is similar to a "pole" that supports the wire pressing frames at both ends, so that the metal part structure is symmetrical and the force is balanced after fixing. The outer hole wall of the first screw hole 11 cooperates with the hole axis of the clamping hole 37 on the inner shell 3 to further increase the connection strength. The outer shell 4 is provided with a first operating hole 41 corresponding to the first screw hole 11, and the outer shell 4 is provided with a second operating hole 42 corresponding to the second screw hole 22, providing a certain distance of contact protection for the exposed metal part at the second screw hole 22, so as to realize the wiring operation without causing direct exposure of the metal part.

[0051] like Figure 1 , Figure 2 , Figure 3 and Figure 8 to Figure 14 As shown, the inner shell 3 is provided with a first inner buckle 34 and a first outer buckle 44 correspondingly provided on the outer shell 4 are locked with each other to form a first pair of locking structures. The first inner buckle 34 is provided at a position corresponding to the elastic leg 5 to balance the force connection point. The first inner buckle 34 and the elastic leg 5 are respectively located on both sides of a support plane 38 perpendicular to the Y axis. The first inner buckle 34 is a pair of door-shaped buckles arranged in parallel to each other. Specifically, the door-shaped buckles are two "convex" frame door-shaped buckles arranged in parallel to each other with a certain distance in the X-axis direction. The bending structure ensures that the door-shaped buckle itself has a certain strength. The first inner buckle 34 is in the Y-axis and X-axis directions. The first outer buckle 44 is a rib plate connected to the inner wall of the outer shell 4, which increases the shell strength. Its cross-sectional shape is a left-right symmetrical T-shaped structure, called a T-shaped buckle. In the Y-axis direction, one end is narrower and the other end is wider. When the inner shell 3 and the outer shell 4 are engaged with each other in the Y-axis direction, the narrower end gradually snaps into the door-shaped buckle, and the width of the wider end is greater than the spacing between the two door-shaped buckles. The end faces of the wider end form limit locks with the two door-shaped buckles, so they can be limited by them and the force is more balanced. Obviously, if only one door-shaped buckle is designed to cooperate with a variable-section wedge, the purpose of limiting the relative movement between the inner shell and the outer shell in the Y-axis direction can be achieved.

[0052] like Figure 1 , Figure 3 , Figure 4 and Figure 8 to Figure 14As shown, the inner shell 3 is provided with a second inner buckle 35 and the second outer buckle 45 correspondingly provided on the outer shell 4 are locked with each other to form a second pair of locking structures. The second inner buckle 35 is a V-shaped buckle, which is also arranged on the support plane 38 and maintains a certain distance in the X-axis direction with the first inner buckle 34 mentioned above. When the elastic leg 5 is deformed, it may cause the inner shell 3 to deform, and there is a very small possibility that the mutual locking of the first inner buckle 34 and the first outer buckle 44 fails due to deformation. At this time, the second pair of locking structures can continue to play a locking role. The free end of the V-shaped buckle has an outward extension part and is elastic in the Z-axis direction. The second outer buckle 45 is a slot for the V-shaped buckle to be inserted and limited. The slot is formed by ribs arranged on the inner shell wall of the outer shell, which increases the shell strength. When the first pair of locking structures are locked in place, the second pair of locking structures are also locked in place. At this time, the inner shell 3 and the outer shell 4 cannot move relative to each other in the Y-axis direction. The second pair of snap-fit ​​structures is relatively independent from the first pair of snap-fit ​​structures. If one pair of snaps fails, the other pair can continue to function, thereby improving the reliability of the product.

[0053] like Figure 1 , Figure 3 , Figure 5 and Figure 8 to Figure 12 As shown, the inner shell 3 is provided with a third inner component buckle 36 which is locked with the corresponding third outer component buckle 46 on the outer shell 4. The third inner component buckle 36 is four guide grooves parallel to the Y-axis direction, and the third outer component buckle 46 is four corresponding ribs. The third inner component buckle 36 is elastic in the Z-axis direction, so that the assembly composed of the metal part and the inner shell 3 can be slidably assembled into the outer shell 4. The guide groove makes it easier to slide in and convenient to operate. After sliding in, the assembly can be prevented from rotating or deforming in the outer shell 4.

[0054] In summary, this embodiment improves the strength of individual parts and assemblies by changing the structure of the metal part and the shell part of the terminal and designing multiple groups of snap-fit ​​structures with carefully selected shapes and positions. It will not collapse between the inner shell 3 and the outer shell 4 when the torque is large. It can be made thinner at the same strength, and the product as a whole has a closed symmetrical structure.

[0055] Table 1 below is a comparison of relevant parameters of this embodiment and existing commercially available Phoenix brand terminal blocks of different specifications.

[0056] Table 1

[0057]

[0058]

[0059] It can be seen that by using the wiring terminal of this embodiment, its voltage level can be increased to 1000V, its creepage distance can be increased to 12.5mm, it has excellent electrical performance, is easy to assemble and easy to use. For wiring terminals of larger specifications, the application of this embodiment can significantly reduce its thickness and weight, save costs and occupy space.

Claims

1. A terminal block, wherein the terminal body is a combined structure, comprising a metal part and a shell part, wherein the metal part comprises a connecting piece (1) and left and right wire pressing frames (2) conductively connected via the connecting piece (1), wherein the shell part comprises an inner shell (3) and an outer shell (4) for fixing the metal part, wherein the metal part is assembled on an inner end surface (30) of the inner shell (3) in the Y-axis direction and then encapsulated and fixed by the outer shell (4), wherein the metal part and the inner shell (3) and the inner shell (3) and the outer shell (4) are mutually joined along the Y-axis direction, Its characteristics are: The inner shell (3) is provided with a first positioning structure for cooperating with the connecting piece (1) and a first limiting structure for cooperating with the wire pressing frame (2); A first screw hole (11) is provided at the center of the connecting piece (1), an outer hole wall of the first screw hole (11) cooperates with the hole axis of the clamping hole (37) on the inner shell (3), and a first operating hole (41) corresponding to the first screw hole (11) is provided on the outer shell (4); The inner shell (3) is provided with a first inner buckle (34) which is locked with a first outer buckle (44) correspondingly provided on the outer shell (4); The shell portion comprises an elastic leg (5), the elastic leg (5) being located on the inner shell (3), the first inner component buckle (34) being arranged at a position corresponding to the elastic leg (5), and the elastic leg (5) and the first inner component buckle (34) being respectively located on two sides of a supporting plane (38) perpendicular to the Y axis.

2. The terminal block according to claim 1, characterized in that: The first positioning structure is four upright posts (31) arranged on the inner end surface (30).

3. The terminal block according to claim 1, characterized in that: The first limiting structure is a wall (32) arranged on the inner shell body and extending to the inner end surface (30), and a rib (33) connected to the wall (32).

4. The terminal block according to claim 1, characterized in that: The left and right wire pressing frames (2) are both hollow structures having a through hole (21); a second screw hole (22) connected to the through hole (21) is arranged on the wire pressing frame (2); the connecting piece (1) is fixed to the inner end surface of the second screw hole (22) after passing through the through hole (21); the axis of the second screw hole (22) is parallel to the Y axis; and a second operating hole (42) corresponding to the second screw hole (22) is arranged on the housing (4).

5. The connection terminal according to any one of claims 1 to 4, characterized in that: The first inner component buckle (34) has elasticity in an X-axis direction perpendicular to both the Y-axis and the thickness direction of the shell portion.

6. The connection terminal according to any one of claims 1 to 4, characterized in that: The first inner buckle (34) is a pair of door-shaped buckles arranged parallel to each other, and the first outer buckle (44) is a T-shaped buckle that can be inserted into the door-shaped buckle and limited by it.

7. The connecting terminal according to any one of claims 1 to 4, characterized in that: The inner shell (3) is provided with a second inner buckle (35) which is locked with a corresponding second outer buckle (45) provided on the outer shell (4).

8. The terminal block according to claim 7, characterized in that: The second inner component buckle (35) has elasticity in the thickness direction of the shell part.

9. The terminal block according to claim 7, characterized in that: The second inner buckle (35) is a V-shaped buckle or a U-shaped buckle, and the second outer buckle (45) is a slot into which the V-shaped buckle or the U-shaped buckle can be inserted and limit the position.

10. The connecting terminal according to any one of claims 1 to 4, characterized in that: The inner shell (3) is provided with a third inner buckle (36) which is locked with a corresponding third outer buckle (46) provided on the outer shell (4).

11. The connecting terminal according to claim 10, characterized in that: The third inner component buckle (36) has elasticity in the thickness direction of the shell part.

12. The connecting terminal according to claim 10, characterized in that: The third inner component buckle (36) is four guide grooves parallel to the Y-axis direction, and the third outer component buckle (46) is four corresponding ribs.

13. The connecting terminal according to any one of claims 1 to 4, characterized in that: The inner shell (3) and the outer shell (4) are both planar symmetrical structures with two mutually perpendicular planes passing through the Y axis as symmetry planes.

14. The connecting terminal according to claim 13, characterized in that: At least two pairs of corresponding snap-fit ​​structures are arranged on the inner shell (3) and the outer shell (4).

15. The connecting terminal according to claim 13, characterized in that: The inner shell (3) and the outer shell (4) are at least partially structured in an inside-outside containing relationship in the thickness direction of the shell portion.

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