CN107396578B

CN107396578B - Connection structure of electric cabinet and electric cabinet

Info

Publication number: CN107396578B
Application number: CN201710816891.1A
Authority: CN
Inventors: 江金源; 黄福豪; 梁荣鑫; 樊超; 王健
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2017-09-12
Filing date: 2017-09-12
Publication date: 2023-05-16
Anticipated expiration: 2037-09-12
Also published as: WO2019052288A1; CN107396578A

Abstract

The invention discloses a connecting structure of an electric cabinet and the electric cabinet, and relates to the field of electric control equipment. The connecting structure of the electric cabinet comprises a cabinet body, a cabinet cover and a connecting piece, wherein the connecting piece is arranged outside the cabinet cover and the cabinet body and used for clamping the cabinet cover and the cabinet body. Above-mentioned technical scheme, design the connecting piece between box, case lid, install the elastic component on the connecting piece, after connecting piece and box combine, utilize the elasticity of elastic component can the buckle case lid, the removal of connecting piece can be restricted to upper and second apron of electric cabinet, can protect the spring simultaneously from corroding, has improved the life of connecting piece.

Description

Connection structure of electric cabinet and electric cabinet

Technical Field

The invention relates to the field of electric control equipment, in particular to a connection structure of an electric control box and the electric control box.

Background

As shown in fig. 1, a conventional cabinet 400 of an electric cabinet is connected to a panel 100 by a connector such as a hinge 300, and then a door lock 200 is installed on the panel 100 to lock the panel 100 and the cabinet 400.

The inventors found that at least the following problems exist in the prior art: because the electric cabinet can be placed outdoors for use, if the hinge 300 is used as a connecting piece in a wet and rainy use environment, the hinge 300 is easy to corrode, and the panel 100 needs to be opened and closed frequently, the hinge 300 is easy to fatigue and damage, so that the panel 100 is easy to fall off.

Disclosure of Invention

One of the purposes of the invention is to provide a connecting structure of an electric cabinet and the electric cabinet, which are used for locking a cabinet body and a panel of the electric cabinet.

In order to achieve the above purpose, the present invention provides the following technical solutions:

the invention provides a connecting structure of an electric cabinet, which comprises a cabinet body, a cabinet cover and a connecting piece, wherein the connecting piece is arranged outside the cabinet cover and the cabinet body and is used for clamping the cabinet cover and the cabinet body.

In an alternative embodiment, the connecting member is rotatably connected to the case, and the connecting member applies a force to the case cover toward the case; or alternatively, the process may be performed,

the connecting piece is rotatably connected with the box cover, and the connecting piece applies a force towards the box cover to the box body.

In an alternative embodiment, the connecting piece comprises a connecting body and an elastic piece, the connecting body is rotatably connected with the box body, the elastic piece is clamped between the connecting body and the box body, the first clamping part of the connecting body and the elastic piece are positioned on one side of the rotatable connection part, and the second clamping part of the connecting body is positioned on the other side of the rotatable connection part;

the elastic piece applies a rotating force to the first clamping part so that the connecting body rotates relative to the box body, and the second clamping part applies a pressing force to the box cover under the action of the rotating force so that the box cover is close to the box body.

In an alternative embodiment, a clamping portion is arranged on one side, facing the box body, of the box cover, the clamping portion is in surface contact with a second clamping portion of the connecting body, and a contact surface of the clamping portion and the second clamping portion is parallel to the extending direction of the box cover.

In an alternative embodiment, a step part is arranged outside the box body, the step part is in surface contact with the first clamping part, and the direction of the contact surface of the step part and the first clamping part is perpendicular to the extending direction of the box cover.

In an alternative embodiment, the connection body and the box body are rotatably connected through spherical contact.

In an alternative embodiment, the elastic member is selected from one of the following: a spring and a spring piece.

In an alternative embodiment, the side of the box cover facing the box body is provided with a clamping groove, and the edge of the box body is clamped in the clamping groove.

In an alternative embodiment, the part of the box body clamped in the clamping groove is provided with an inner concave part, and a sealing element is arranged in the inner concave part.

In an alternative embodiment, the tank is an aluminum alloy.

In an alternative embodiment, the cover is an aluminum alloy.

In an alternative embodiment, the number of the connecting pieces is a plurality, and each connecting piece is arranged in a scattered manner.

In an alternative embodiment, the distance L1 between the rotatable connection of the connection body and the housing and the end of the first holding part is greater than the distance L2 between the rotatable connection and the end of the second holding part.

In an alternative embodiment, L1: l2=1.5 to 3.5.

In an alternative embodiment, the elastic member includes a spring, where the spring includes a first section connected to the connection body and a second section for abutting against the case, and an included angle between the first section and the second section is a right angle or an obtuse angle.

In an alternative embodiment, the angle between the first section and the second section is 120 ° to 135 °.

In an alternative embodiment, the box comprises a U-shaped body, a first cover plate and a second cover plate, the U-shaped body comprising a first opening, a second opening and a third opening, the first opening being opposite to the second opening; the first cover plate is arranged at the first opening, the second cover plate is arranged at the second opening, and the box cover is arranged at the third opening.

In an alternative embodiment, two longitudinal ends of the connecting piece are respectively attached to the first cover plate and the second cover plate.

In an alternative embodiment, the first cover plate is detachably connected to the U-shaped body, and/or the second cover plate is detachably connected to the U-shaped body.

Another embodiment of the present invention provides an electric cabinet, which includes the connection structure of the electric cabinet provided by any one of the technical schemes of the present invention.

Based on the technical scheme, the embodiment of the invention at least has the following technical effects:

above-mentioned technical scheme has designed the connecting piece between box, case lid, installs the elastic component on the connecting piece, and after connecting piece and box combined, the elasticity that utilizes the elastic component can the buckle case lid, and the box of electric cabinet, case lid can restrict the removal of connecting piece, can protect the spring to avoid corroding simultaneously, have improved the life of connecting piece.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:

fig. 1 is a schematic diagram of connection between a case cover and a case body of an electric control case in the prior art;

fig. 2 is a schematic diagram of a matching relationship between parts of a connection structure of an electric cabinet according to an embodiment of the present invention;

FIG. 3 is an enlarged schematic view of part A of FIG. 2;

fig. 4 is a schematic diagram of a matching relationship of each part of a connection structure of an electric cabinet according to an embodiment of the present invention;

FIG. 5 is an enlarged schematic view of part B of FIG. 4;

FIG. 6 is a schematic view of the connector of FIG. 2;

FIG. 7 is a schematic front view of the elastic member in FIG. 2;

FIG. 8 is a schematic side view of the spring of FIG. 2;

FIG. 9 is a schematic cross-sectional view of C-C of FIG. 8;

FIG. 10 is a schematic side view of the spring with the maximum outer diameter labeled;

fig. 11 is a schematic partial structure diagram of an electric cabinet connection structure according to another embodiment of the present invention;

FIG. 12 is a schematic front view of the spring in FIG. 11;

fig. 13 is a schematic side view of the structure of fig. 12.

Reference numerals: 1. a case; 2. a case cover; 3. a connecting piece; 11. a first groove; 12. a second groove; 13. a step part; 14. an inner concave portion; 15. a U-shaped body; 16. a first cover plate; 17. a second cover plate; 21. a first protrusion; 22. a second protrusion; 23. a clamping part; 24. clamping grooves; 31. a connection body; 32. an elastic member; 311. a first clamping part; 312. a second clamping part; 321. a first section; 322. and a second section.

100. A panel; 200. a door lock; 300. a hinge; 400. a box body.

Detailed Description

The technical scheme provided by the invention is described in more detail below with reference to fig. 2 to 13.

Referring to fig. 2 and 4, the embodiment of the invention provides a connection structure of an electric cabinet, which comprises a cabinet body 1, a cabinet cover 2 and a connecting piece 3, wherein the connecting piece 3 is arranged outside the cabinet cover 2 and the cabinet body 1, and the connecting piece 3 is used for clamping the cabinet cover 2 and the cabinet body 1, namely, the cabinet cover 2 and the cabinet body 1 are tightly attached, and a gap between the cabinet cover 2 and the cabinet body 1 is very small.

The electric cabinet is internally used for installing electrical components. After the connecting member 3 is provided, the case 1 and the cover 2 can be directly firmly held together without providing other connecting structures.

Referring to fig. 4 and 5, in the present embodiment, the connecting member 3 is disposed outside the case 1 and the case cover 2, and does not penetrate the case 1 and the case cover 2, so that the sealing performance of the electric cabinet is not affected unlike the penetrating connection manner of bolts and the like. After the connecting piece 3 is installed in place, clamping of the box body 1 and the box cover 2 is automatically achieved, and additional operations such as locking are not needed.

Referring to fig. 4, the number of the connection members 3 is plural, and the connection members 3 are arranged in a dispersed manner.

The connector 3 can fasten the case 1 and the case cover 2 together using the principle of leverage. Such as the following two ways:

mode one: the connecting member 3 is rotatably connected to the case 1, and the connecting member 3 applies a force to the case cover 2 toward the case 1.

Mode two: the connecting member 3 is rotatably connected to the case cover 2, and the connecting member 3 applies a force to the case body 1 toward the case cover 2.

When the size of the box body 1 is obviously larger than that of the box cover 2, the former mode is simpler, more convenient and more stable to install.

Referring to fig. 5, an alternative embodiment is: the connecting member 3 includes a connecting body 31 and an elastic member 32. The connection body 31 is rotatably connected with the case 1, and the elastic member 32 is sandwiched between the connection body 31 and the case 1 (specifically, the U-shaped body 15). The first clamping portion 311 of the connecting body 31 and the elastic member 32 are located at one side of the rotatable connection, and the second clamping portion 312 of the connecting body 31 is located at the other side of the rotatable connection. The elastic member 32 is in a compressed state after being mounted.

Wherein, the elastic member 32 applies a rotational force to the first clamping portion 311 to rotate the connection body 31 relative to the case 1, and the second clamping portion 312 applies a pressing force to the case cover 2 to bring the case cover 2 close to the case 1 under the rotational force.

In the above structure, the cover 2 is firmly connected with the case 1 by the elastic force of the elastic member 32.

Referring to fig. 5, the case 1 is provided with a step portion 13 on the outside, the step portion 13 is in surface contact with the first holding portion 311, and the contact surface of the step portion 13 with the first holding portion 311 is perpendicular to the extending direction of the surface of the case cover 2. The elastic force of the elastic member 32 can be effectively transmitted to the stepped portion 13 by this structure.

Referring to fig. 5, a side of the case cover 2 facing the case 1 is provided with a clamping portion 23, the clamping portion 23 is in surface contact with a second clamping portion 312 of the connection body 31, and a contact surface of the clamping portion 23 and the second clamping portion 312 is parallel to an extending direction of a surface of the case cover 2. The clamping part 23 is in surface-to-surface contact with the second clamping part 312, so that the installation is convenient, and the force can be reliably transmitted.

The connecting piece 3 is arranged in the concave outside the box body 1, and the outer surface of the connecting piece 3 is basically flush with the outer surface of the box body 1, so that the appearance of the whole electric control box is smoother and the whole electric control box is more compact.

Referring to fig. 5, the connection body 31 is rotatably connected to the case 1 by spherical contact. The connection mode is convenient to install and reliable in connection.

Referring to fig. 5 and 6, the connecting member 3 uses the lever principle when being locked, the left and right sides of the case body are provided with the connecting members 3, each connecting member 3 is provided with a rotation pivot, each connecting member 3 is provided with a first clamping portion 311 and a second clamping portion 312, each connecting member 3 comprises a spring serving as an elastic member 32, before the connecting member 3 is inserted, the spring is fastened on the connecting body 31 of the connecting member 3 through the screw, the height of the spring is larger than the distance between the connecting body 31 and the case body 1, the connecting member 3 compresses the spring when being inserted into the case body along the rotation pivot, the clamping portion 23 on the case cover 2 and the second clamping portion 312 of the connecting member 3 are mutually buckled by the elastic force of the spring, the first clamping portion 311 of the connecting member 3 and the step portion 13 on the case body are mutually buckled, the function of fastening the case cover 2 and the case body 1 together is realized under the combined action of the two groups of buckles, and the sealing performance of the case body is improved.

The connection body 31, the box cover 2 and the box body 1 are all formed by extrusion, so that the rotating pivot of the box body 1 is in a rib shape, corresponding rotating grooves are formed in the connecting piece 3, the rotating grooves are matched with the rotating pivot, the connecting piece can be inserted from the upper end or the lower end of the box body, and then the whole connecting piece 3 can rotate around the pivot.

Referring to fig. 5 and 6, when the case cover 2 is to be taken out, the connecting pieces 3 on both sides need to be pressed simultaneously, because the locking of the connecting pieces 3 uses the lever principle, when pressing, the connecting pieces 3 rotate around the supporting point, the distance from the first clamping portion 311 to the supporting point is the pressing position of the finger of a person, the length is L1, the distance from the second clamping portion 312 to the supporting point is L2, and the distance L1 is greater than the distance L2. Alternatively, L1: l2=1.5 to 3.5. In this embodiment, the two distances satisfy the relationship: l2:l1=1: 2. l2:l1=1: 2 is an optional value, mainly considering the installation space of the connecting piece 3 reserved on two sides of the box body 1 and the elasticity generated by the spring; the ratio is selected so that the larger the length L1, the easier the connector is pressed to open the cover, and the cover is easily opened to avoid erroneous operation during installation, using the same spring, under the condition of generating the same elastic force.

The fastening force of the connecting piece 3 is provided by the elastic force of a spring, the structure and the size of the spring are shown in fig. 5, the spring is designed with two mounting holes, the spring can be fastened on the connecting piece by screwing in a screw, and the following relation is satisfied for each size of the spring:

(1) Referring to fig. 7, the height H of the spring is greater than the distance between the connector 3 and the case 1, the connector 3 can compress the spring when inserted, so that the spring generates elastic force, the value range of H is 6 mm-12 mm, and the compression amount of the spring is 1 mm-7 mm.

(2) Referring to fig. 8 and 9, the diameter D and the pitch L of the spring affect the deformation difficulty of the spring, considering that the force generated when the finger is pressed by the hand should be greater than the elastic force of the spring, the cover can be opened, and the value range of the diameter D is as follows: the value range of the pitch L is 0.6 mm-1.2 mm: 1 mm-3 mm.

(3) Referring to fig. 10, the outer diameter E of the maximum coil of the spring and the number of turns C of the spring are mainly limited by the installation space between the connecting piece and the main body, and if the outer diameter E is too large, the connecting piece cannot be inserted into the box body, and the reasonable value range is 10 mm-13.5 mm; the number of spring turns C is determined by the height H and the pitch L, and the three have the following relation: c is approximately equal to H/L.

In the embodiment illustrated in fig. 2 to 10, the elastic member 32 is exemplified by a spring, and in the embodiment illustrated in fig. 11 to 13, the elastic member 32 is exemplified by a spring sheet. However, the structures of other parts can be referred to with each other except for the spring and the elastic sheet.

Referring to fig. 5, the side of the case cover 2 facing the case 1 is provided with a catching groove 24, and the edge of the case 1 is caught in the catching groove 24. This serves on the one hand for positioning and on the other hand also makes the connection of the housing 1 and the cover 2 more stable.

Referring to fig. 5, the portion of the case 1 caught in the catching groove 24 is provided with an inner recess 14, and a seal is provided in the inner recess 14. The seal 4 includes a seal ring or the like. The electric cabinet can reach the protection level of IP65 by adopting the box cover and the sealing piece 4 with the structures.

Optionally, the case 1 is an aluminum alloy. Optionally, the cover 2 is of an aluminium alloy. Therefore, the overall heat dissipation performance of the aluminum-plastic electric cabinet can be greatly improved.

Referring to fig. 4, in the present embodiment, the number of the connection members 3 is plural, and the connection members 3 are arranged in a dispersed manner.

Referring to fig. 4 and 6, in order to make the case 1 and the case cover 2 detachable, but not easily detachable, the distance L1 between the rotatable connection of the connection body 31 and the case 1 and the end of the first catching portion 311 is greater than the distance L2 between the rotatable connection and the end of the second catching portion 312.

Referring to fig. 11 to 13, in another embodiment of the present invention, the elastic member 32 includes a spring, and the spring includes a first section 321 connected to the connecting body 31 and a second section 322 for abutting against the case 1, where an included angle between the first section 321 and the second section 322 is a right angle or an obtuse angle.

In this embodiment, the included angle between the first section 321 and the second section 322 is 120 ° to 135 °.

Referring to fig. 11 to 13, the spring plate is mounted in the same manner as the spring, and when the connecting piece is inserted into the box body, the spring plate is deformed, and the original bending angle of the spring plate is increased, so that elastic force is generated to fasten the box cover and the main body; the factors influencing the deformation difficulty degree of the elastic sheet mainly comprise a bending angle B and the thickness A of the elastic sheet, and the two dimensions should meet the following relation:

(1) The thickness M1 of the elastic sheet has the following value range: 0.8 mm-1.2 mm; if the elastic sheet is too thick, the elastic sheet is difficult to deform and the case cover is difficult to take out when the elastic sheet is pressed by a finger of a person; if the elastic sheet is too thin, when the elastic sheet is pressed by a finger of a person, the elastic sheet cannot recover after deformation, the elastic sheet loses elasticity, and the case cover and the main body cannot be fastened;

(2) The bending angle alpha of the elastic sheet has the following value range: 120-135 degrees, and the bending angle of the elastic sheet is 5-10 degrees when the connector is inserted; if the bending angle is too small, the elastic piece is difficult to deform when the connecting piece is inserted into the box body, so that the connecting piece cannot be inserted smoothly; if the bending angle is too large, the elastic sheet cannot deform when the connecting piece is inserted into the box body, the elastic sheet cannot generate elastic force, and the box cover and the main body cannot be fastened.

Above-mentioned technical scheme, at the left and right both sides design connecting piece mounting structure of electric cabinet main part, install the elastic component on the connecting piece, after connecting piece and box combine, utilize the elasticity of elastic component can the fastening case lid, the removal of connecting piece can be restricted to upper and second apron of electric cabinet, can protect the spring to avoid corroding simultaneously, has improved the life of connecting piece.

Referring to fig. 2 and 4, in each embodiment, the case 1 may adopt the following structure: the box 1 comprises a U-shaped main body 15, a first cover plate 16 and a second cover plate 17, wherein the U-shaped main body 15 comprises a first opening, a second opening and a third opening, and the first opening is opposite to the second opening; the first cover 16 is provided in the first opening, the second cover 17 is provided in the second opening, and the cover 2 is provided in the third opening.

Alternatively, both ends of the connector 3 in the longitudinal direction are respectively attached to the first cover plate 16 and the second cover plate 17.

As shown in fig. 3, the springs are fastened on the connecting piece 3 by screws, and the upper and lower planes of the connecting piece 3 are respectively clung to the first cover plate 16 and the second cover plate 17 of the electric cabinet, so that the first cover plate 16 and the second cover plate 17 can effectively prevent rainwater, dust and the like from entering the connecting piece 3 from the upper and lower ends of the connecting piece, the possibility of corrosion of the springs in the connecting piece 3 is reduced, and the service lives of the springs and the screws are prolonged. In fig. 3, the upper and lower ends refer to the ends of the connecting member 3 contacting the first cover plate 16 and the second cover plate 17. After the connecting piece 3 combines with the box 1, because the connecting piece 3 includes the spring, utilize the elasticity of spring can the fastening case lid 2, first apron 16, the second apron 17 of electric cabinet carry out the joint with box 1, can restrict the removal of connecting piece 3, can protect the spring simultaneously and avoid corroding, improved the life of connecting piece 3.

Optionally, the first cover plate 16 is detachably inserted into the U-shaped body 15, and/or the second cover plate 17 is detachably inserted into the U-shaped body 15.

In the description of the present invention, it should be understood that the terms "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the protection of the present invention.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may be modified or some technical features may be replaced with others, which may not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. The connecting structure of the electric cabinet is characterized by comprising a cabinet body (1), a cabinet cover (2) and a connecting piece (3), wherein the connecting piece (3) is arranged outside the cabinet cover (2) and the cabinet body (1), and the connecting piece (3) is configured to clamp the cabinet cover (2) and the cabinet body (1);

a step part (13) is arranged outside the box body (1); the box cover (2) comprises a clamping part (23);

the connecting piece (3) comprises a connecting body (31) and an elastic piece (32); the connecting body (31) comprises a first clamping part (311) and a second clamping part (312);

the connecting body (31) is rotatably connected with the box body (1), the elastic piece (32) is clamped between the connecting body (31) and the box body (1), the first clamping part (311) and the elastic piece (32) are positioned on one side of the rotatable connection part, and the second clamping part (312) is positioned on the other side of the rotatable connection part;

the step part (13) is in surface contact with the first clamping part (311), and the contact surface of the step part (13) and the first clamping part (311) is perpendicular to the extending direction of the box cover (2); the clamping part (23) is in surface contact with the second clamping part (312), and the contact surface of the clamping part (23) and the second clamping part (312) is parallel to the extending direction of the surface of the box cover (2);

wherein the elastic member (32) applies a rotational force to the first holding portion (311) to rotate the connection body (31) relative to the case (1), and the second holding portion (312) applies a pressing force to the case cover (2) to bring the case cover (2) close to the case (1) under the action of the rotational force;

the elastic force of the elastic piece (32) enables the clamping part (23) and the second clamping part (312) to be buckled with each other, the first clamping part (311) of the connecting piece (3) and the step part (13) to be buckled with each other, and under the combined action of the two groups of buckles, the box cover (2) and the box body (1) are buckled.

2. The connection structure of the electric cabinet according to claim 1, wherein a clamping portion (23) is provided on a side of the case cover (2) facing the case body (1), the clamping portion (23) is in surface contact with a second clamping portion (312) of the connection body (31), and a contact surface of the clamping portion (23) and the second clamping portion (312) is parallel to an extending direction of the case cover (2).

3. The connection structure of an electric cabinet according to claim 1, characterized in that the connection body (31) is rotatably connected to the cabinet (1) by spherical contact.

4. The connection structure of an electric cabinet according to claim 1, wherein the elastic member (32) is selected from one of the following: a spring and a spring piece.

5. The connection structure of an electric cabinet according to claim 1, characterized in that the side of the cabinet cover (2) facing the cabinet body (1) is provided with a clamping groove (24), and the edge of the cabinet body (1) is clamped in the clamping groove (24).

6. The connection structure of an electric cabinet according to claim 5, characterized in that the part of the cabinet (1) clamped in the clamping groove (24) is provided with an inner recess (14), and a sealing member is arranged in the inner recess (14).

7. The connection structure of an electric cabinet according to claim 1, characterized in that the cabinet (1) is of aluminum alloy.

8. The connection structure of an electric cabinet according to claim 1, characterized in that the cover (2) is of aluminum alloy.

9. The connection structure of the electric cabinet according to claim 1, wherein the number of the connection members (3) is plural, and each connection member (3) is disposed in a dispersed manner.

10. The connection structure of an electric cabinet according to claim 1, wherein a distance L1 between a rotatable connection of the connection body (31) and the cabinet (1) and an end of the first clamping portion (311) is greater than a distance L2 between the rotatable connection and an end of the second clamping portion (312).

11. The connection structure of an electric cabinet according to claim 10, wherein L1: l2=1.5 to 3.5.

12. The connection structure of an electric cabinet according to claim 4, wherein the elastic member (32) comprises a spring plate, the spring plate comprises a first section (321) connected with the connection body (31) and a second section (322) for abutting against the cabinet (1), and an included angle between the first section (321) and the second section (322) is a right angle or an obtuse angle.

13. The connection structure of an electric cabinet according to claim 12, characterized in that the angle between the first section (321) and the second section (322) is 120 ° to 135 °.

14. The connection structure of an electric cabinet according to claim 1, characterized in that the cabinet (1) comprises a U-shaped body (15), a first cover plate (16) and a second cover plate (17), the U-shaped body (15) comprising a first opening, a second opening and a third opening, the first opening being opposite to the second opening; the first cover plate (16) is arranged at the first opening, the second cover plate (17) is arranged at the second opening, and the box cover (2) is arranged at the third opening.

15. The connection structure of the electric cabinet according to claim 14, wherein the two ends of the connecting piece (3) in the longitudinal direction are respectively attached to the first cover plate (16) and the second cover plate (17).

16. The connection structure of an electric cabinet according to claim 14, characterized in that the first cover plate (16) is detachably inserted with the U-shaped body (15) and/or the second cover plate (17) is detachably inserted with the U-shaped body (15).

17. An electric cabinet, characterized by comprising the connection structure of the electric cabinet according to any one of claims 1 to 16.