CN102088135A

CN102088135A - Earth plate and cabinet using same

Info

Publication number: CN102088135A
Application number: CN2009102119480A
Authority: CN
Inventors: 高冀; 任忠宝
Original assignee: Siemens AG
Current assignee: Siemens AG
Priority date: 2009-12-04
Filing date: 2009-12-04
Publication date: 2011-06-08
Also published as: RU2467439C2; RU2010149737A; IN2010DE02307A; BRPI1005553A2

Abstract

The invention provides an earth plate and a cabinet using the same. The earth plate comprises a base part, a connection part, an extension part, a first contact part and a second contact part, wherein the connection part, the extension part and the second contact part form a semi-closed space; the connection part, the extension part and the first contact part are arrayed in an approximate 'Z' shape; at least one round hole is formed on the first contact part; and at least one circular arc groove is formed on the end part of the second contact part along the extension direction. When the earth plate provided by the invention is used, the second contact part can be fixed by a fastener, so the contact area of the earth plate and the frame can be increased, the resistance can be reduced, and relatively high electromagnetic compatible requirement can be met.

Description

Grounding plate and cabinet using same

Technical Field

The invention relates to a grounding device, in particular to a grounding plate and a cabinet body using the grounding plate.

Background

For some electrical devices, such as frequency converters, different electromagnetic compatibility requirements require different grounding properties. In order to meet the requirement of electromagnetic compatibility, a grounding plate is required to be arranged in the cabinet body.

For the requirement of simpler electromagnetic compatibility, the common grounding plate, the bolt, the washer and the like can be used for meeting the requirement, but the common grounding plate cannot meet the requirement of higher electromagnetic compatibility.

Disclosure of Invention

The invention aims to provide a grounding plate which can meet the requirement for higher electromagnetic compatibility.

In order to achieve the above object, the present invention provides a ground plate, including a base, a connecting portion, an extending portion, a first contact portion and a second contact portion, wherein the connecting portion, the extending portion and the second contact portion form a semi-enclosed space, the connecting portion, the extending portion and the first contact portion are substantially in a "Z" shape, the first contact portion is provided with at least one circular hole, and an end of the second contact portion is provided with at least one arc groove along an extending direction.

Preferably, the connecting portion is substantially perpendicular to the base portion.

Preferably, the extension is substantially perpendicular to the connection portion.

Preferably, the first contact portion is substantially perpendicular to the extension portion.

Preferably, the first contact part is provided with at least one oblong hole.

Preferably, the grounding plate is integrally machined from a material.

Preferably, the material is galvanized steel.

Preferably, the first contact portion is provided with three round holes, and/or the end portion of the second contact portion is provided with three arc grooves along the extending direction.

The invention also provides a cabinet body using the grounding plate, and the cabinet body can further comprise a bus bar, wherein the grounding plate and the bus bar are fixed on the cabinet body through a fastening device. Preferably, the cabinet body is a frequency converter cabinet body or a switch cabinet body.

By utilizing the grounding plate provided by the invention, as the second contact part can be fixed by the fastening device, the contact area of the grounding plate and the cabinet body frame can be increased, the resistance value is reduced, and the higher electromagnetic compatibility requirement is met. Meanwhile, because the bus bar is used in the cabinet body, paint sprayed on the frame of the cabinet body in advance does not need to be removed, and special conductive paint or grease does not need to be additionally coated, so that the cost is reduced, and the oxidation reaction of the frame can be effectively reduced.

Drawings

The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein,

fig. 1 is a schematic perspective view of one embodiment of a ground plate provided by the present invention;

fig. 2 is a top view of the grounding plate embodiment shown in fig. 1;

fig. 3 is a side view of the embodiment of the grounding plate shown in fig. 1;

fig. 4 is a schematic perspective view of another embodiment of a ground plate provided by the present invention;

fig. 5 is a schematic perspective view of another embodiment of a grounding plate provided by the present invention;

fig. 6 is a schematic perspective view of a further embodiment of a grounding plate provided in the present invention;

FIG. 7 is a schematic view of one embodiment of a cabinet provided by the present invention;

fig. 8 is a partial enlarged view at a in fig. 7;

fig. 9 is a partially enlarged view at B in fig. 7.

Detailed Description

In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.

The invention provides a grounding plate which comprises a base part, a connecting part, an extending part, a first contact part and a second contact part, wherein the connecting part, the extending part and the second contact part form a semi-closed space, the connecting part, the extending part and the first contact part are approximately Z-shaped, at least one round hole is formed in the first contact part, and at least one arc groove is formed in the end part of the second contact part along the extending direction.

As shown in fig. 1, 2 and 3, the ground plate 1 includes a base 13, an extending portion 15, a connecting portion 14, a first contact portion 11 and a second contact portion 12, wherein the extending portion 15, the connecting portion 14 and the second contact portion 12 form a semi-enclosed space 19, the semi-enclosed space 19 is open along the X direction, the first contact portion 11 is provided with at least one circular hole 111, an end of the second contact portion 12 is provided with at least one circular arc groove 121, and the opening points to the direction X. The first contact portion 11 extends along the direction Y, and the second contact portion 12 extends along the direction X.

The second contact portion 12 is connected to one end of the base portion 13 along the X direction, the connection portion 14 is connected to the Y direction, and a circular hole 19 may be formed in the base portion 13 to facilitate a user to connect a copper conductive bar and the like, thereby achieving a ground connection function. The base portion 13 may be formed by folding a whole piece of material in two in a Z direction, one end of the material being connected to the second contact portion 12 after folding, and the other end being connected to the connecting portion 14. As shown in fig. 2, the base 13 may also be gradually widened in the X direction to form a structure similar to a trapezoid.

The second contact portion 12 extends from one end of the base portion 13 along the X direction, and is provided with at least one arc groove 121 along the X direction at the extending end thereof, preferably, three arc grooves 121 may be provided, the distance between the arc grooves 121 may be selected according to the design, and with the arc grooves 121, the user may conveniently mount the ground plate 1 on the frame 4 in the cabinet as shown in fig. 8 through fastening devices 23 such as screws or bolts.

The connecting portion 14 may be substantially perpendicular to the base portion 13 in the Y direction away from the second contact portion 12, but of course, other angles may be provided between the connecting portion 14 and the base portion 13. The portion and the base 13 can be smoothly connected and transited through a circular arc.

The extending portion 15 may be substantially perpendicular to the connecting portion 14 in the X direction, and of course, other angles may be provided between the extending portion 15 and the base portion 13 as long as it is ensured that a semi-enclosed space 19 can be formed together with the connecting portion 14 and the second contact portion 12, and the formed semi-enclosed space 19 may be "C" shaped, and of course, the semi-enclosed space 19 may also be "V" shaped, "U" shaped or other similar shapes according to different designs, so as to ensure that the formed space can accommodate the tail portion of a fastening device (such as a prefabricated bolt, a fixing screw, etc.). The size of the space can be determined according to the cabinet body framework section bar, so that the grounding plate 1 can be conveniently installed and fixed on the cabinet body frame.

Preferably, as shown in fig. 3, the extension portion 15 is substantially parallel to the second contact portion 12, and the portion and the base portion 13 may be smoothly connected and transited through a circular arc.

The first contact portion 11 may be substantially perpendicular to the extending portion 15 in the Y direction away from the second contact portion 12, and at least one circular hole 111, preferably three circular holes 111, are formed on the first contact portion 11, and the distance between the circular holes 111 may be selected according to the design. The round hole 111 may be a screw hole for receiving a fastening device 21 such as a screw or a bolt, and fixing the ground plate 1 on another mounting surface of the space of the cabinet frame profile 5; the round hole 111 can be a long round hole, and can compensate manufacturing errors on the space installation surface of the cabinet body frame. Preferably, the grounding plate 1 can be fixed on the cabinet frame section bar 5 through the bus bar 3 and other materials, and the first contact part has a larger contact area, so that the contact resistance of the whole frame can be reduced together with the side bus bar, and simultaneously, the EMC (Electromagnetic Compatibility) effect is enhanced and the effective grounding of the cabinet shell is ensured.

The ground plate 1 may be made of galvanized steel, and is formed by bending a whole piece of material, for example, a steel plate is folded in half, a part of the folded steel plate is folded twice in the Y direction, a connection portion 14, an extension portion 15 and a first contact portion 11 are sequentially formed, the other part of the folded steel plate is a second contact portion 12, and a portion between the connection portion 14 and the second contact portion 12 is a base portion 13.

Of course, it is also possible to fix the parts or parts together by welding or gluing, for example by fixing the connection part and/or the second contact part to the base part by welding or gluing, respectively, on the ends of the base part.

The present invention also provides the ground plate of fig. 2, in the ground plate 1a shown in fig. 2, the base portion 13a is formed on the basis of one piece of material, and then the second contact portion 12a and the connection portion 14a are connected thereto, respectively.

In the ground plate 1b shown in fig. 3, the base portion 13b is located at a substantially middle portion or other position of the connection portion 14b, and is not directly connected to the extension portion 15b or the second contact portion 12b, and the extension portion 15b and the second contact portion 12b are substantially perpendicular to both ends of the connection portion 14b, respectively.

In the ground plate 1d shown in fig. 4, unlike the ground plate 1 shown in fig. 1, the base 13d is located on the first contact portion 11d side, and the end of the base 13d extends to be connected to the extending portion 15 d.

As shown in fig. 7, the present invention further provides a cabinet 100, such as a frequency converter cabinet or a switch cabinet, or other cabinets with electromagnetic compatibility requirements.

In the partial view of the frequency converter cabinet 100 shown in fig. 8, the ground plate 1 provided by the present invention is used, and the ground plate 1 and the bus bar 3 are fixed on the cabinet 100, for example, fixed on the cabinet frame 4, by the

fastening devices

21 and 23, the frame 4 is formed by welding sectional materials, and is used as a supporting framework of the whole cabinet, and is provided with a circular hole 42 for mounting and fixing some supporting beams and mounting plates in the cabinet to fix and support electrical components.

The bus bar 3 and the grounding plate 1 are installed on the frame 5 of the cabinet body through a plurality of (for example, 29) prefabricated bolts 21 (teeth at the end part can break paint on the frame 5 of the cabinet body to reduce the resistance), and the paint breaking effect of the prefabricated bolts 21 can well reduce the resistance through the bus bar 3, thereby being beneficial to grounding of the frame of the cabinet shell. As shown in fig. 9, the bus bar 3 can also be connected with a welding bolt 61 welded on the cabinet door 9 through the grounding copper wire 7 (for example, there can be a similar design at 3) to enhance the EMC shielding effect of the cabinet door 9.

By utilizing the grounding plate provided by the invention, as the second contact part can be fixed by the fastening device, the contact area of the grounding plate and the frequency converter frame can be increased, the resistance value is reduced, and the higher electromagnetic compatibility requirement is met. Meanwhile, due to the adoption of the bus bar, paint sprayed on the frame of the frequency converter in advance does not need to be removed, and special conductive paint or grease does not need to be additionally coated, so that the cost is reduced, and meanwhile, the oxidation reaction of the frame can be effectively reduced.

The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent alterations, modifications and combinations can be made by those skilled in the art without departing from the spirit and principles of the invention.

Claims

1. The grounding plate is characterized by comprising a base part, a connecting part, an extending part, a first contact part and a second contact part, wherein the connecting part, the extending part and the second contact part form a semi-closed space, the connecting part, the extending part and the first contact part are approximately Z-shaped, at least one round hole is formed in the first contact part, and at least one arc groove is formed in the end part of the second contact part along the extending direction.

2. The ground plate of claim 1, wherein the connection portion is substantially perpendicular to the base portion.

3. The ground plate of claim 1, wherein the extension is substantially perpendicular to the connection portion.

4. The ground-plane of claim 1, wherein the first contact is substantially perpendicular to the extension.

5. The ground-plane according to claim 1, characterized in that said first contact portion has at least one oblong hole.

6. The ground plate of claim 1, wherein said ground plate is integrally formed of a material.

7. The ground plate of claim 6, wherein said material is galvanized steel.

8. The ground plate according to claim 1, characterized in that said first contact portion is provided with three circular holes and/or said second contact portion is provided with three circular arc grooves at its end in the extension direction.

9. A cabinet, characterized in that it comprises a ground plate according to any one of claims 1 to 8.

10. The cabinet of claim 9, further comprising a bus bar, wherein the ground plate and the bus bar are secured to the cabinet by a fastening device.

11. The cabinet body according to claim 9, wherein the cabinet body is a frequency converter cabinet body or a switch cabinet body.