High-protection low-voltage draw-out type switch cabinet and protection method thereof

Abstract

The invention discloses a high-protection low-voltage draw-out type switch cabinet and a protection method thereof, and relates to the technical field of electrical equipment.The high-protection low-voltage draw-out type switch cabinet comprises a cold-roll steel sheet outer shielding layer, a double-layer shielding assembly is connected to the inner side of the cold-roll steel sheet outer shielding layer, and connecting grooves are symmetrically formed in the inner side of the double-layer shielding assembly; a draw-out type element mounting assembly is mounted in the connecting groove, the draw-out type element mounting assembly comprises a connecting bottom plate mounted in the connecting groove, a metal shielding cover is mounted at the top of the connecting bottom plate, and a first sliding groove and a second sliding groove which are symmetrically formed are formed in the side wall and the bottom wall of the metal shielding cover correspondingly; sliding plates are installed in the first sliding grooves, a fixing plate is installed between the two sets of sliding plates, and a ball guide rail is installed at the bottom of the fixing plate. By arranging the double-layer shielding assembly on the inner side of the cold-roll steel sheet outer shielding layer, the problems that an existing switch cabinet is poor in adaptability in a complex electromagnetic environment, and element faults and signal distortion are easily caused by electromagnetic interference can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of electrical equipment, in particular to a high-protection low-voltage withdrawable switch cabinet and a protection method thereof. Background Art

[0002] Traditional low-voltage withdrawable switchgear cannot build a wide-band, multi-level, and pulse-resistant electromagnetic shielding system, and cannot effectively cope with medium and low-frequency electromagnetic interference and electromagnetic pulse shocks in complex electromagnetic environments, resulting in frequent failures of internal electrical components and severe signal distortion in strong electromagnetic interference scenarios. The low-voltage withdrawable switchgear of the present application can solve the problem that existing switchgear has poor adaptability in complex electromagnetic environments and is prone to component failures and signal distortion due to electromagnetic interference.

[0003] The defects of the existing low-voltage withdrawable switch cabinet are: 1. Patent document CN108429178B discloses a low-voltage withdrawable switch cabinet. The document mainly considers how to solve the problem that when the drawer unit is withdrawn, it cannot effectively prevent the drawer unit from accidentally falling, which is not conducive to the operator's operation of the equipment. It does not consider how to solve the problem that the existing switch cabinet has poor adaptability in complex electromagnetic environments and is prone to component failure and signal distortion due to electromagnetic interference; 2. Patent document CN106786036B discloses a low-voltage withdrawable switch cabinet. The document mainly considers how to solve the problem of switch cabinet heating, but does not consider how to solve the problems of poor electromagnetic compatibility and low maintenance efficiency caused by unreasonable component layout and installation structure of existing switch cabinets; 3. Patent document CN118739102B discloses a low-voltage withdrawable switch cabinet. The document mainly considers how to solve the problem that most of the withdrawable low-voltage cabinets in the prior art cannot limit the pushing mechanism when the drawer is not pushed to the bottom, which makes the staff operate incorrectly and the virtual connection of the main contacts of the drawer will lead to arc generation, short circuit and other dangerous situations. It does not consider how to solve the problem that the electromagnetic protection performance of the existing switch cabinet door is rapidly degraded in long-term use or in harsh environments due to the simple sealing and shielding measures; 4. Patent document CN109066441B discloses a low-voltage withdrawable switch cabinet. The document mainly considers how to solve the problem of inconvenience in moving drawers, but does not consider how to solve the problem of external electromagnetic interference invading along the line due to lack or weak shielding at the inlet and outlet positions of the existing switch cabinet, causing internal line failures and component malfunctions. Summary of the invention

[0004] The object of the present invention is to provide a low-voltage withdrawable switch cabinet with high protection and a protection method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: a highly protective low-voltage withdrawable switch cabinet, comprising a cold-rolled steel plate outer shielding layer, the inner side of which is connected to a double-layer shielding component, the double-layer shielding component is used to provide electromagnetic shielding protection for the interior of the switch cabinet; The double-layer shielding assembly includes a filling gap arranged inside the outer shielding layer of the cold-rolled steel plate, triangular absorbing rubber blocks are evenly arranged inside the filling gap, and the inner side of the triangular absorbing rubber blocks is connected to the inner shielding layer of the galvanized steel plate; The inner side of the double-layer shielding component is provided with symmetrically arranged connection grooves, and a withdrawable component mounting component is installed inside the connection groove, and the withdrawable component mounting component is used to fix the electrical components; The pull-out component installation assembly includes a connecting base plate installed inside the connecting groove, a metal shielding cover is installed on the top of the connecting base plate, and the side wall and bottom wall of the metal shielding cover are respectively provided with a symmetrically arranged sliding groove one and a sliding groove two, a sliding plate is installed inside the sliding groove one, a fixed plate is installed between the two sets of sliding plates, a ball guide rail is installed at the bottom of the fixed plate, and the ball guide rail is installed inside the sliding groove two.

[0006] Preferably, a limit plate is connected to the outer side of the metal shielding cover, and the limit plate is installed inside the connecting groove; The contact surfaces of the limit plate and the connecting bottom plate with the connecting groove are provided with a wear-resistant coating, which is a ceramic coating with a thickness of 120 μm-260 μm.

[0007] Preferably, the front sides of the metal shielding cover and the cold-rolled steel plate outer shielding layer are connected to a cabinet door shielding assembly via a hinge, and the cabinet door shielding assembly is used to perform electromagnetic shielding and sealing protection on the front side of the switch cabinet; The cabinet door shielding assembly includes a cabinet door frame 1 and a cabinet door frame 2 connected to the front of the metal shielding cover and the cold-rolled steel plate outer shielding layer through hinges, the inner edges of the cabinet door frame 1 and the cabinet door frame 2 are installed with electromagnetic sealing strips, the interior of the electromagnetic sealing strip is provided with a steel wire mesh, the inner side of the steel wire mesh is installed with a protective cabinet door 1 and a protective cabinet door 2, the front of the protective cabinet door 1 and the protective cabinet door 2 is coated with an aluminum oxide film, the back of the protective cabinet door 1 and the protective cabinet door 2 is coated with a metallized polyester film, and the metallized polyester film includes a polyester film base layer and a metal conductive layer vapor-deposited on the surface of one side of the polyester film base layer; Handle three is installed on the front of the protective cabinet door one and the protective cabinet door two.

[0008] Preferably, the metal conductive layer is a copper-zinc alloy layer with a thickness of 62nm-132nm, and the mass ratio of copper to zinc in the copper-zinc alloy layer is 3:2.

[0009] Preferably, a handle 1 is installed on the front of the connecting bottom plate, a handle 2 is installed on the front of the fixing plate, and the handle 1 is located below the handle 2; The surfaces of handle one, handle two and handle three are all provided with anti-slip patterns, which are semicircular grooves distributed at equal intervals, and the radius of the semicircular grooves is mm-mm. Shock-absorbing rubber pads are provided between handle one and the connecting base plate, between handle two and the fixed plate, and between handle three and protective cabinet door one and protective cabinet door two, and the thickness of the shock-absorbing rubber pads is 3mm-8mm.

[0010] Preferably, the fixing plate, the metal shielding cover and the connecting bottom plate are provided with inlet and outlet holes, and inlet and outlet shielding components are installed inside the inlet and outlet holes, and the inlet and outlet shielding components are used to shield electromagnetic interference signals entering the switch cabinet through the inlet and outlet holes; The inlet and outlet wire shielding assembly includes a stainless steel shielding sleeve installed inside the inlet and outlet wire holes, and the interior of the stainless steel shielding sleeve is filled with conductive rubber; Metal flanges are installed at both ends of the stainless steel shielding sleeve, and the metal flanges are connected to the outer shielding layer of the cold-rolled steel plate through bolts.

[0011] Preferably, an annular sealing gasket is provided at the connection between the metal flange and the stainless steel shielding sleeve. The annular sealing gasket is made of fluororubber and has a thickness of 2mm-6mm. The outer edge of the metal flange is provided with an outwardly protruding annular rib, and the height of the annular rib is 3mm-7mm.

[0012] Preferably, a honeycomb brass ventilation plate is embedded in the top of the cold-rolled steel plate outer shielding layer, the double-layer shielding assembly and the metal shielding cover, and an electromagnetic interference filter is installed at the bottom of the honeycomb brass ventilation plate.

[0013] Preferably, the protection method of the low-voltage withdrawable switch cabinet is as follows: S1. Install the component on the top of the fixed plate through the pull-out component installation assembly; S2, electromagnetic shielding protection is provided inside the switch cabinet through double-layer shielding components; S3. Use the cabinet door shielding assembly to provide electromagnetic shielding and sealing protection for the front of the switch cabinet; S4. Shield the electromagnetic interference signal that enters the switch cabinet through the inlet and outlet holes through the inlet and outlet wire shielding components.

[0014] Preferably, in S2, the following steps are also included: S21, the outer shielding layer of the cold-rolled steel plate performs preliminary shielding and blocking of external electromagnetic interference, and the triangular absorbing rubber block is in the filling gap to absorb part of the electromagnetic radiation that passes through the outer shielding layer of the cold-rolled steel plate; S22, the inner shielding layer of the galvanized steel plate provides shielding protection for the interior again, and cooperates with the outer shielding layer of the cold-rolled steel plate and the triangular absorbing rubber block to form a multi-layered electromagnetic shielding structure; In S3, the following steps are also included: S31. The electromagnetic sealing strips on the inner edge of the cabinet door frame and the internal steel wire mesh enhance the structural strength and electromagnetic shielding performance to prevent electromagnetic signals from leaking from the cabinet door gap; S32. The aluminum oxide film on the front of the protective cabinet door protects the cabinet door surface and prevents surface charge accumulation, and the metallized polyester film on the back reflects and shields electromagnetic signals.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention sets a double-layer shielding component on the inner side of the outer shielding layer of the cold-rolled steel plate. The triangular absorbing rubber block can effectively absorb electromagnetic radiation in a specific frequency band, complementing the outer shielding layer of the cold-rolled steel plate and the inner shielding layer of the galvanized steel plate, and constructing a wide-band and multi-level electromagnetic shielding system, which greatly improves the electromagnetic shielding efficiency inside the switch cabinet. Compared with the single shielding structure or simple combined shielding method in the prior art, it can more accurately block interference signals in complex electromagnetic environments, thereby ensuring that the internal electrical components can still operate stably and accurately in strong electromagnetic interference scenarios, such as large industrial electrical equipment concentrated areas or near communication base stations, effectively solving the problem that the existing switch cabinet has poor adaptability in complex electromagnetic environments and is prone to component failure and signal distortion due to electromagnetic interference.

[0016] 2. The present invention uses the metal shielding cover, sliding plate, fixed plate and ball guide rail in the pull-out component installation assembly to work together. The metal shielding cover provides a local independent shielding space for the electrical components to reduce electromagnetic crosstalk between components. The sliding plate and the ball guide rail cooperate to enable the fixed plate to be smoothly pulled out and pushed in, which is convenient for component installation, maintenance and replacement, and has low mechanical wear and high stability during frequent operation. Compared with the traditional switch cabinet component installation that relies on simple frame fixation, the pull-out operation is stuck and lacks independent shielding protection, it significantly improves the working reliability and operational convenience of electrical components throughout their life cycle, and solves the problems of poor electromagnetic compatibility and low maintenance efficiency caused by unreasonable component layout and installation structure in existing switch cabinets.

[0017] 3. The present invention is equipped with a cabinet door shielding component. The electromagnetic sealing strip of the cabinet door frame fits tightly with the wire mesh to form a mechanical and electromagnetic double sealing barrier, which prevents electromagnetic signals from leaking from the tiny door gap. The aluminum oxide film protecting the cabinet door has high insulation and corrosion resistance, which prevents the risk of discharge caused by static charge accumulation on the cabinet door surface. The metallized polyester film efficiently shields external electromagnetic waves based on the principle of electromagnetic reflection. Compared with the existing switch cabinet doors that only rely on simple sealing strips and door panels for protection, this component greatly improves the electromagnetic shielding integrity and protection durability of the cabinet door, and effectively solves the problem that the electromagnetic protection performance of the existing switch cabinet doors is rapidly attenuated due to simple sealing and shielding measures in long-term use or harsh environments.

[0018] 4. The present invention uses an inlet and outlet wire shielding assembly set in the inlet and outlet wire holes, a stainless steel shielding sleeve combined with an internal conductive rubber to effectively absorb and shield the electromagnetic interference signals conducted by the inlet and outlet wires, and the stable connection between the metal flange and the outer shielding layer of the cold-rolled steel plate ensures the integrity of the shielding structure and the reliability of grounding. Compared with the existing switch cabinet inlet and outlet wires that only use ordinary sleeves or simple shielding rings, this assembly can fully resist the external electromagnetic interference from entering the switch cabinet through line coupling, ensuring the purity of the internal line signal transmission and protecting the electrical components from the electromagnetic impact introduced by the line, and effectively solving the problem of external electromagnetic interference invading along the line due to the lack or weak shielding at the inlet and outlet wire positions of the existing switch cabinet, causing internal line failures and component malfunctions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention; Figure 3 It is a schematic diagram of the structure of the double-layer shielding assembly of the present invention; Figure 4 It is a schematic diagram of the structure of the withdrawable component installation assembly of the present invention; Figure 5 It is a schematic diagram of the internal structure of the metal shielding cover of the present invention; Figure 6 It is a schematic diagram of the structure of the cabinet door shielding assembly of the present invention; Figure 7 It is a schematic diagram of the fixing plate structure of the present invention; Figure 8 It is a protection flow chart of the present invention.

[0020] In the figure: 1. Outer shielding layer of cold-rolled steel plate; 2. Triangular absorbing rubber block; 3. Inner shielding layer of galvanized steel plate; 4. Connecting groove; 5. Connecting bottom plate; 6. Metal shielding cover; 7. Sliding groove one; 8. Sliding groove two; 9. Sliding plate; 10. Fixed plate; 11. Limiting plate; 12. Cabinet door frame one; 13. Protective cabinet door one; 14. Aluminum oxide film; 15. Metallized polyester film; 16. Inlet and outlet holes; 17. Honeycomb brass ventilation plate; 18. Cabinet door frame two; 19. Protective cabinet door two. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 7 and Figure 8 , an embodiment provided by the present invention: a high-protection low-voltage withdrawable switch cabinet, comprising a cold-rolled steel plate outer shielding layer 1, the inner side of the cold-rolled steel plate outer shielding layer 1 is connected with a double-layer shielding component, and the double-layer shielding component is used to perform electromagnetic shielding protection on the inside of the switch cabinet; The double-layer shielding assembly includes a filling gap arranged inside the outer shielding layer 1 of the cold-rolled steel plate, triangular absorbing rubber blocks 2 are evenly arranged inside the filling gap, and the inner side of the triangular absorbing rubber blocks 2 is connected to the inner shielding layer 3 of the galvanized steel plate; The inner side of the double-layer shielding assembly is provided with symmetrically arranged connection grooves 4, and a withdrawable component mounting assembly is installed inside the connection groove 4, and the withdrawable component mounting assembly is used to fix the electrical components; The pull-out component installation assembly includes a connecting base plate 5 installed inside the connecting groove 4, a metal shielding cover 6 is installed on the top of the connecting base plate 5, and the side wall and bottom wall of the metal shielding cover 6 are respectively provided with a symmetrically arranged sliding groove 1 7 and a sliding groove 2 8, a sliding plate 9 is installed inside the sliding groove 1 7, a fixed plate 10 is installed between the two groups of sliding plates 9, a ball guide rail is installed at the bottom of the fixed plate 10, and the ball guide rail is installed inside the sliding groove 2 8.

[0025] Furthermore, the outer shielding layer 1 of the cold-rolled steel plate withstands the mechanical impact of the external environment and the preliminary electromagnetic protection task, provides support and basic protection framework for the internal double-layer shielding components, and fills the gap to provide installation space for the triangular absorbing rubber blocks 2, which are arranged in a uniformly distributed manner. The triangular shape increases the contact area and arrangement density of the rubber blocks in the gap, improving the space utilization. The triangular absorbing rubber block 2 absorbs electromagnetic radiation in a specific frequency band, especially the medium and low frequency electromagnetic interference commonly found in industrial environments. It can convert part of the electromagnetic radiation that passes through the outer shielding layer 1 of the cold-rolled steel plate into heat energy or other forms of energy and consume it, effectively reducing the amount of electromagnetic interference that enters deeper into the switch cabinet, further purifying the internal electromagnetic environment, and reducing the potential impact of electromagnetic interference on electrical components.

[0026] The galvanized steel plate inner shielding layer 3 serves as the inner shielding layer of the double-layer shielding assembly, and works in conjunction with the cold-rolled steel plate outer shielding layer 1 and the triangular absorbing rubber block 2. It can re-shield and reflect the electromagnetic residual signals that may still exist after being processed by the first two, and isolate the internal electrical components from the external electromagnetic environment more effectively, forming a multi-level electromagnetic shielding structure, greatly improving the overall electromagnetic shielding efficiency inside the switch cabinet, and ensuring that the electrical components work in a relatively pure electromagnetic environment.

[0027] The connecting groove 4 is symmetrically arranged on the inner side of the double-layer shielding component, and its shape and size match the connecting base plate 5. The connecting groove 4 serves to connect and support the pull-out component installation component, so that the installation component can be firmly installed on the inner side of the double-layer shielding component, and during the installation, extraction and maintenance of electrical components, it provides a stable track and space restriction for the movement of the component, ensuring the smoothness and accuracy of the operation process.

[0028] The connecting base plate 5 provides a stable installation plane for the metal shielding cover 6 and the electrical components, evenly distributes the weight of the electrical components on the connecting slot 4, and assists the electromagnetic conduction and grounding of the entire shielding system through its own conductivity, ensuring the firmness of the installation of the electrical components and the reliability of the electrical connection. At the same time, during the extraction operation, it cooperates with the connecting slot 4 to provide a smooth moving foundation.

[0029] The metal shielding cover 6 provides a local independent shielding space for the electrical components installed inside, reducing the electromagnetic crosstalk between the components. The metal shielding cover 6 wraps the electrical components inside to form a relatively independent electromagnetic environment, preventing the electromagnetic signals generated by the components themselves from leaking outward and affecting other components, while also preventing external electromagnetic interference from entering the cover and affecting the normal operation of the components.

[0030] The sliding groove 1 7 and the sliding groove 2 8 provide guidance for the sliding plate 9 and the ball guide rail, so that the fixed plate 10 can be smoothly pulled out and pushed in along the predetermined direction in the metal shielding cover 6. The friction resistance during the movement of the fixed plate 10 is reduced, and the mechanical wear caused by friction is reduced, thereby improving the service life and operational reliability of the withdrawable component mounting assembly.

[0031] See also Figure 2 , Figure 4 and Figure 5 , an embodiment provided by the present invention: a high-protection low-voltage withdrawable switch cabinet, the outer side of the metal shielding cover 6 is connected to a limit plate 11, and the limit plate 11 is installed inside the connecting groove 4; The contact surfaces of the limiting plate 11 and the connecting bottom plate 5 and the connecting groove 4 are provided with a wear-resistant coating, which is a ceramic coating with a thickness of 120 μm-260 μm.

[0032] Furthermore, the limit plate 11 is connected to the outside of the metal shielding cover 6 and installed inside the connecting groove 4. The shape of the limit plate 11 is adapted to the contour of the connecting groove 4 to ensure that the stability and reliability of the metal shielding cover 6 can be maintained when subjected to various forces. When the pull-out component installation assembly is pulled out or pushed in the connecting groove 4, the limit plate 11 can prevent the metal shielding cover 6 from excessive lateral displacement due to uneven force or improper operation, and ensure that it always runs smoothly along the predetermined track. At the same time, when the switch cabinet is subjected to external vibration or impact, the limit plate 11 can evenly disperse and transfer the force to the connecting groove 4, enhance the seismic resistance and stability of the entire structure, ensure that the internal electrical components are not damaged or adversely affected by displacement, and maintain the reliability and stability of the electrical connection.

[0033] The wear-resistant coating is made of ceramic material and is evenly coated on the contact surface between the limit plate 11 and the connecting bottom plate 5 and the connecting groove 4. During long-term use, the pull-out component installation assembly needs to be frequently pulled out and pushed in the connecting groove 4, which will inevitably cause friction on the contact surface between the components. The presence of the wear-resistant ceramic coating can significantly reduce the wear on the surface of the components caused by this friction. It can effectively resist the scratches, abrasions and wear caused by friction, extend the service life of the limit plate 11, the connecting bottom plate 5 and the connecting groove 4, and reduce the frequency of component replacement and maintenance costs caused by wear. At the same time, the high hardness and chemical stability of the ceramic coating can also prevent corrosion caused by exposure to the environment due to wear of the metal surface in humid or corrosive gas conditions, further protecting the integrity of the internal structure of the switch cabinet and the stability of the electrical performance, ensuring that the switch cabinet can operate reliably under various working conditions, and continuously providing a good protection and support environment for electrical components.

[0034] See also Figure 1 and Figure 4 , an embodiment provided by the present invention: a highly protective low-voltage withdrawable switch cabinet, the front of the metal shielding cover 6 and the cold-rolled steel plate outer shielding layer 1 are connected with a cabinet door shielding assembly through a hinge, and the cabinet door shielding assembly is used to perform electromagnetic shielding and sealing protection on the front of the switch cabinet; The cabinet door shielding assembly includes a cabinet door frame 12 and a cabinet door frame 2 18 connected to the front of the metal shielding cover 6 and the cold-rolled steel plate outer shielding layer 1 through hinges, the inner edges of the cabinet door frame 12 and the cabinet door frame 2 18 are installed with electromagnetic sealing strips, the interior of the electromagnetic sealing strip is provided with a steel wire mesh, and the inner side of the steel wire mesh is installed with a protective cabinet door 13 and a protective cabinet door 2 19, the front of the protective cabinet door 13 and the protective cabinet door 2 19 is coated with an aluminum oxide film 14, and the back of the protective cabinet door 13 and the protective cabinet door 2 19 is coated with a metallized polyester film 15, and the metallized polyester film 15 includes a polyester film base layer and a metal conductive layer vapor-deposited on the surface of one side of the polyester film base layer; Handle three is installed on the front of the protection cabinet door 1 13 and the protection cabinet door 2 19 .

[0035] The metal conductive layer is a copper-zinc alloy layer with a thickness of 62nm-132nm, and the mass ratio of copper to zinc in the copper-zinc alloy layer is 3:2.

[0036] Furthermore, the cabinet door frame 12 and the cabinet door frame 2 18 are respectively connected to the front of the metal shielding cover 6 and the cold-rolled steel plate outer shielding layer 1 through hinges to form a frame structure on the front of the switch cabinet. The cabinet door frame 12 and the cabinet door frame 2 18 serve as support frames for the protective cabinet door 13 and the protective cabinet door 2 19, providing a stable structural foundation for the entire cabinet door shielding assembly. The connection with the metal shielding cover 6 and the cold-rolled steel plate outer shielding layer 1 ensures the integrity and continuity of the electromagnetic shielding structure of the entire switch cabinet when the cabinet door is closed, effectively preventing electromagnetic signals from leaking from the gaps on the front.

[0037] The electromagnetic sealing strip is installed on the inner edge of the cabinet door frame, and a steel wire mesh is embedded inside. The electromagnetic sealing strip is compressed by the elastic deformation ability when the protective cabinet door 13 and the protective cabinet door 2 19 are closed, filling the tiny gap between the protective cabinet door 13 and the protective cabinet door 2 19 and the cabinet door frame 12 and the cabinet door frame 2 18, forming a mechanical seal to prevent impurities such as dust or moisture from entering the interior of the switch cabinet. At the same time, due to the presence of the internal steel wire mesh and its own conductivity, it can effectively conduct and shield electromagnetic signals, and work together with the metallized polyester film 15 of the protective cabinet door 13 and the protective cabinet door 2 19 to enhance the overall electromagnetic shielding performance of the cabinet door, forming the first line of defense for electromagnetic shielding, and reducing the possibility of electromagnetic interference entering the interior of the switch cabinet from the cabinet door gap.

[0038] The aluminum oxide film 14 has high insulation and good corrosion resistance, forming an insulating barrier to prevent the cabinet door surface from absorbing dust, impurities, etc. due to static electricity accumulation, while avoiding safety hazards caused by static electricity discharge, protecting the surface smoothness and integrity of protective cabinet door 1 13 and protective cabinet door 2 19, extending the service life of protective cabinet door 1 13 and protective cabinet door 2 19, and maintaining the stability of their electromagnetic shielding performance.

[0039] The metallized polyester film 15 includes a polyester film base and a metal conductive layer vapor-deposited on one side of the polyester film base. The polyester film base provides good flexibility and mechanical support, and the copper-zinc alloy layer vapor-deposited on one side of the surface with a thickness of 62nm-132nm and a copper-zinc mass ratio of 3:2 is used as a metal conductive layer, which has good conductivity and electromagnetic reflection characteristics. The metal conductive layer can efficiently reflect and shield external electromagnetic interference signals and reflect most of the electromagnetic energy back to the external environment. Together with the electromagnetic sealing strip and wire mesh, the metal shielding cover 6, the cold-rolled steel plate outer shielding layer 1, etc., a multi-level electromagnetic shielding system is formed to ensure that the electrical components inside the switch cabinet are protected from external electromagnetic interference. Handle three is installed on the front of the protective cabinet door 1 13 and the protective cabinet door 2 19 to facilitate the operator to open and close the cabinet door.

[0040] See also Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 7 , an embodiment provided by the present invention: a high-protection low-voltage withdrawable switch cabinet, wherein a handle 1 is installed on the front of the connecting bottom plate 5, a handle 2 is installed on the front of the fixing plate 10, and the handle 1 is located below the handle 2; The surfaces of handle one, handle two and handle three are all provided with anti-slip patterns, which are semicircular grooves distributed at equal intervals, and the radius of the semicircular grooves is 2mm-5mm. Shock-absorbing rubber pads are provided between handle one and the connecting base plate 5, between handle two and the fixing plate 10, and between handle three and protective cabinet door one 13 and protective cabinet door two 19, and the thickness of the shock-absorbing rubber pads is 3mm-8mm.

[0041] Furthermore, handle 1 is installed on the front of the connecting bottom plate 5, and handle 2 is installed on the front of the fixing plate 10, and they are distributed up and down. The anti-slip texture on the surface is semicircular grooves distributed at equal intervals, and the depth of these grooves is moderate, and the radius is between 2mm-5mm, which can effectively increase the friction between the hand and the handle without causing discomfort to the hand.

[0042] The handle 1 is used to provide a fulcrum when pulling out or pushing in the connection base plate 5 and its accessories, so as to facilitate the operation of the operator, so that the connection base plate 5 can move smoothly in the connection slot 4. The handle 2 is used to perform similar operations on the fixing plate 10, especially when it is necessary to maintain, replace or debug the electrical components installed on the fixing plate 10, the fixing plate 10 can be easily pulled out of the metal shielding cover 6 by pulling the handle 2, thereby improving the convenience and efficiency of the operation.

[0043] See also Figure 7 , an embodiment of the present invention: a high-protection low-voltage withdrawable switch cabinet, wherein the fixed plate 10, the metal shielding cover 6 and the connecting bottom plate 5 are provided with inlet and outlet holes 16, and the inlet and outlet wire shielding components are installed inside the inlet and outlet wire holes 16, and the inlet and outlet wire shielding components are used to shield the electromagnetic interference signals entering the switch cabinet through the inlet and outlet wire holes 16; The inlet and outlet wire shielding assembly comprises a stainless steel shielding sleeve installed inside the inlet and outlet wire hole 16, and the interior of the stainless steel shielding sleeve is filled with conductive rubber; Metal flanges are installed at both ends of the stainless steel shielding sleeve, and the metal flanges are connected to the cold-rolled steel plate outer shielding layer 1 through bolts.

[0044] An annular sealing gasket is arranged at the connection between the metal flange and the stainless steel shielding sleeve. The annular sealing gasket is made of fluororubber and has a thickness of 2mm-6mm. An outwardly protruding annular rib is arranged on the outer edge of the metal flange and has a height of 3mm-7mm.

[0045] Furthermore, the stainless steel shielding sleeve is installed inside the fixed plate 10, the metal shielding cover 6 and the inlet and outlet holes 16 connecting the bottom plate 5. As the main electromagnetic shielding channel for the inlet and outlet lines, the stainless steel shielding sleeve can effectively block the external electromagnetic interference signal from being conducted along the cable into the switch cabinet. Its metal material can reflect and absorb electromagnetic waves, limiting most of the interference signals outside the sleeve, thereby protecting the electrical components in the switch cabinet from the electromagnetic interference introduced by the line.

[0046] Conductive rubber is filled inside the stainless steel shielding sleeve. For those weak electromagnetic interference signals that penetrate the stainless steel shielding sleeve, the conductive rubber can further absorb and attenuate them. When the electromagnetic interference wave enters the conductive rubber, the conductive network inside it will cause the electromagnetic wave to generate induced current. These currents are converted into other forms of energy such as heat energy inside the conductive rubber and are consumed, thereby achieving secondary shielding of electromagnetic interference, greatly improving the electromagnetic shielding effect at the inlet and outlet holes 16, and ensuring the purity of the line signal entering the switch cabinet.

[0047] The metal flange is installed at both ends of the stainless steel shielding sleeve and connected to the outer shielding layer 1 of the cold-rolled steel plate by bolts. On the one hand, the metal flange plays the role of fixing the stainless steel shielding sleeve to ensure its stable position in the inlet and outlet holes 16 to prevent displacement or loosening due to external forces. On the other hand, as part of the electromagnetic shielding structure, it connects the stainless steel shielding sleeve and the outer shielding layer 1 of the cold-rolled steel plate into a complete electrical path, so that the electromagnetic shielding effect can be better conducted and synergistic in the shielding system of the entire switch cabinet. Through the reliable connection with the outer shielding layer 1 of the cold-rolled steel plate, the electromagnetic interference signal that may leak to the metal flange can be timely introduced into the earth, further enhancing the reliability of the electromagnetic shielding.

[0048] The annular sealing gasket is located at the connection between the metal flange and the stainless steel shielding sleeve. It is made of fluororubber and has excellent chemical corrosion resistance, high and low temperature resistance, good elasticity and sealing. Its thickness is between 2mm-6mm, and it can form a tight sealing layer between the metal flange and the stainless steel shielding sleeve. It prevents impurities such as dust or moisture from entering the inlet and outlet holes 16 through the gap between the metal flange and the stainless steel shielding sleeve, and avoids the accumulation of impurities that affect the electromagnetic shielding performance of the conductive rubber or cause safety hazards such as line short circuit. At the same time, good sealing performance also helps to maintain the electromagnetic shielding integrity of the entire inlet and outlet shielding assembly, and prevents electromagnetic interference signals from leaking or intruding from these gaps.

[0049] The annular rib is set on the outer edge of the metal flange, protruding outward with a height of 3mm-7mm. To a certain extent, it protects the connection between the metal flange and the stainless steel shielding sleeve from accidental collision or damage from the outside, ensuring the reliability and stability of the connection. At the same time, the annular rib also helps to guide possible impurities such as dust and water droplets to slide along its edge, reducing the accumulation of impurities at the connection point, further assisting the annular sealing gasket to maintain a good sealing and protection effect, and ensuring the normal operation of the inlet and outlet cable shielding components and the continued effectiveness of the electromagnetic shielding function.

[0050] See also Figure 1 , Figure 4 and Figure 5 An embodiment of the present invention is a highly protective low-voltage withdrawable switch cabinet, wherein a honeycomb brass ventilation plate 17 is embedded in the top of the cold-rolled steel plate outer shielding layer 1, the double-layer shielding assembly and the metal shielding cover 6, and an electromagnetic interference filter is installed at the bottom of the honeycomb brass ventilation plate 17.

[0051] Furthermore, the primary function of the honeycomb brass ventilation plate 17 is to provide a ventilation and heat dissipation channel for the interior of the switch cabinet. Heat will be generated during the operation of electrical components. If the heat cannot be dissipated in time, the temperature of the components will be too high, affecting their performance and service life, and may even cause failures. The honeycomb brass ventilation plate 17 discharges the hot air inside the switch cabinet and introduces external cold air through natural convection of air or forced convection with the assistance of ventilation equipment, thereby maintaining the internal temperature within a suitable range and ensuring the normal working environment of the electrical components. At the same time, due to the conductivity of brass, the ventilation plate also participates in the electromagnetic shielding system of the entire switch cabinet. It can shield electromagnetic interference that may invade from the top direction, and work in conjunction with the cold-rolled steel plate outer shielding layer 1, the double-layer shielding assembly and the metal shielding cover 6 to prevent external electromagnetic signals from entering the interior of the switch cabinet through the vents, ensuring the stability of the internal electromagnetic environment and avoiding adverse effects of electromagnetic interference on electrical components.

[0052] The electromagnetic interference filter is installed at the bottom of the honeycomb brass ventilation plate 17, and is used to further filter and purify the electromagnetic interference signals that enter the switch cabinet through the honeycomb brass ventilation plate 17. Although the honeycomb brass ventilation plate 17 already has a certain electromagnetic shielding capability, some electromagnetic interference signals may still enter through the honeycomb brass ventilation plate 17. The electromagnetic interference filter can carry out targeted processing of these residual interference signals according to their frequency characteristics. For high-frequency electromagnetic interference, the capacitor element plays a major role, bypassing the high-frequency signal to the ground through the charging and discharging process; for low-frequency electromagnetic interference, the inductor element attenuates and filters the low-frequency signal through its hindering effect on current changes. Through the action of the electromagnetic interference filter, the electromagnetic interference signal entering the switch cabinet can be reduced to an extremely low level, maximizing the normal operation of the internal electrical components, improving the anti-interference ability of the entire switch cabinet in a complex electromagnetic environment, ensuring the stability and reliability of the electrical system, and reducing the occurrence of problems such as signal distortion and malfunction caused by electromagnetic interference.

[0053] Working principle: The cold-rolled steel plate outer shielding layer 1 is the outermost protection of the switch cabinet. It mainly uses the good conductivity and magnetic conductivity of the cold-rolled steel plate to perform preliminary shielding and blocking of external electromagnetic interference, reflect or absorb most of the electromagnetic radiation, and reduce the amount of electromagnetic interference entering the switch cabinet.

[0054] The triangular absorbing rubber block 2 is located in the filling gap. When electromagnetic radiation passes through the cold-rolled steel plate outer shielding layer 1, the triangular absorbing rubber block 2 can convert electromagnetic energy into other forms of energy such as heat energy, thereby absorbing part of the electromagnetic radiation and further weakening the intensity of electromagnetic interference entering the interior.

[0055] The galvanized steel plate inner shielding layer 3 works together with the cold-rolled steel plate outer shielding layer 1 and the triangular absorbing rubber block 2 to provide shielding protection for the interior again. The galvanized steel plate has good conductivity and can reflect and absorb the remaining electromagnetic radiation, forming a multi-level electromagnetic shielding structure, which effectively protects the electrical components inside the switch cabinet from external electromagnetic interference.

[0056] The connecting base plate 5 serves as the installation base, providing stable support and fixed position for the metal shield 6 and other components, ensuring the structural stability and reliability of the entire installation assembly. The metal shield 6 performs local electromagnetic shielding on the electrical components installed inside. Through its own metal material and closed structure, the electromagnetic radiation generated by the electrical components is limited to a certain range to prevent it from interfering with other components or the external environment, and at the same time, it can also block the influence of external electromagnetic interference on internal components.

[0057] The sliding groove 1 7 and the sliding groove 2 8 provide sliding tracks for the sliding plate 9, so that the fixed plate 10 can slide flexibly in the metal shielding cover 6, which is convenient for the extraction and insertion of electrical components, while maintaining good electrical connection and shielding effect during the sliding process. The installation of the ball guide rail further reduces the sliding friction and makes the operation smoother.

[0058] The wire mesh inside the electromagnetic sealing strip on the inner edge of the cabinet door frame 12 and the cabinet door frame 2 18 can enhance the structural strength of the strip, so that it can better fill the gap when the protective cabinet door 13 and the protective cabinet door 2 19 are closed. At the same time, the wire mesh itself also has certain electromagnetic shielding performance, and works together with the electromagnetic sealing strip to prevent electromagnetic signals from leaking from the gap between the protective cabinet door 13 and the protective cabinet door 2 19, thereby ensuring the electromagnetic shielding effect on the front of the switch cabinet.

[0059] The aluminum oxide film 14 on the front of the protective cabinet door 13 and the protective cabinet door 2 19 has good insulation properties and chemical stability, which can protect the surface of the protective cabinet door 13 and the protective cabinet door 2 19 from external physical damage and chemical corrosion, and can also prevent surface charge accumulation and avoid damage to electrical components caused by electrostatic discharge caused by charge accumulation.

[0060] The metal conductive layer in the metallized polyester film 15 on the back of the protective cabinet door 13 and the protective cabinet door 2 19 can reflect and shield electromagnetic signals. When external electromagnetic radiation shines on the cabinet door, the metal conductive layer reflects most of the electromagnetic signals back, further enhancing the electromagnetic shielding performance of the cabinet door and protecting the electrical components inside the switch cabinet.

[0061] The stainless steel shielding sleeve is installed inside the inlet and outlet holes 16, and uses the good conductivity of stainless steel to shield the electromagnetic interference signals entering the switch cabinet through the inlet and outlet holes 16, preventing external electromagnetic interference from entering the switch cabinet through the lines. At the same time, it can also prevent the electromagnetic signals inside the switch cabinet from radiating outward through the lines.

[0062] The conductive rubber filled inside the stainless steel shielding sleeve has good conductivity and elasticity, which can fill the gap between the stainless steel shielding sleeve and the line to ensure good electrical contact and further enhance the electromagnetic shielding effect. At the same time, it can also play a role in shock absorption or sealing to prevent electromagnetic interference from entering or leaking through the gap.

[0063] The metal flange is connected to the outer shielding layer 1 of the cold-rolled steel plate by bolts. On the one hand, it fixes the position of the stainless steel shielding sleeve to ensure its stable installation at the inlet and outlet holes 16. On the other hand, an annular sealing gasket is provided at the connection between the metal flange and the stainless steel shielding sleeve to ensure the sealing of the connection and prevent electromagnetic interference from entering the interior of the switch cabinet from the connection.

[0064] The honeycomb brass ventilation plate 17 can block and reflect electromagnetic radiation to a certain extent while ensuring ventilation and heat dissipation, preventing external electromagnetic interference from entering the switch cabinet through the ventilation holes. The electromagnetic interference filter is installed at the bottom of the honeycomb brass ventilation plate 17, which can filter the electromagnetic interference signal entering through the ventilation holes, filter out the high-frequency components in the interference signal, and only allow normal working frequency signals to pass, further improving the electromagnetic environment quality inside the switch cabinet and protecting the normal operation of electrical components.

[0065] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A high-protection low-voltage withdrawable switch cabinet, comprising a cold-rolled steel plate outer shielding layer (1), characterized in that: A double-layer shielding component is connected to the inner side of the cold-rolled steel plate outer shielding layer (1), and the double-layer shielding component is used to provide electromagnetic shielding protection for the interior of the switch cabinet; The double-layer shielding assembly comprises a filling gap arranged inside a cold-rolled steel plate outer shielding layer (1), triangular absorbing rubber blocks (2) are evenly arranged inside the filling gap, and the inner side of the triangular absorbing rubber blocks (2) is connected to a galvanized steel plate inner shielding layer (3); The inner side of the double-layer shielding component is provided with symmetrically arranged connection grooves (4), and a withdrawable component mounting component is installed inside the connection groove (4), and the withdrawable component mounting component is used to fix the electrical component; The withdrawable component installation assembly comprises a connecting base plate (5) installed inside a connecting groove (4), a metal shielding cover (6) is installed on the top of the connecting base plate (5), a sliding groove (7) and a sliding groove (8) are symmetrically arranged on the side wall and the bottom wall of the metal shielding cover (6), a sliding plate (9) is installed inside the sliding groove (7), a fixing plate (10) is installed between the two sets of sliding plates (9), a ball guide rail is installed on the bottom of the fixing plate (10), and the ball guide rail is installed inside the sliding groove (8).

2. A high-protection low-voltage withdrawable switch cabinet according to claim 1, characterized in that: The outer side of the metal shielding cover (6) is connected to a limiting plate (11), and the limiting plate (11) is installed inside the connecting groove (4); A wear-resistant coating is provided on the contact surfaces of the limit plate (11) and the connecting bottom plate (5) and the connecting groove (4); the wear-resistant coating is a ceramic coating with a thickness of 120 μm-260 μm.

3. A high-protection low-voltage withdrawable switch cabinet according to claim 1, characterized in that: The front sides of the metal shielding cover (6) and the cold-rolled steel plate outer shielding layer (1) are connected to a cabinet door shielding assembly via a hinge, and the cabinet door shielding assembly is used to provide electromagnetic shielding and sealing protection for the front side of the switch cabinet; The cabinet door shielding assembly comprises a cabinet door frame 1 (12) and a cabinet door frame 2 (18) connected to the front of the metal shielding cover (6) and the cold-rolled steel plate outer shielding layer (1) by hinges, the inner edges of the cabinet door frame 1 (12) and the cabinet door frame 2 (18) are installed with electromagnetic sealing strips, the interior of the electromagnetic sealing strip is provided with a steel wire mesh, the inner side of the steel wire mesh is installed with a protective cabinet door 1 (13) and a protective cabinet door 2 (19), the front sides of the protective cabinet door 1 (13) and the protective cabinet door 2 (19) are coated with an aluminum oxide film (14), the back sides of the protective cabinet door 1 (13) and the protective cabinet door 2 (19) are coated with a metallized polyester film (15), and the metallized polyester film (15) comprises a polyester film base layer and a metal conductive layer vapor-deposited on one side of the polyester film base layer; Handle three is installed on the front of the protective cabinet door 1 (13) and the protective cabinet door 2 (19).

4. A high-protection low-voltage withdrawable switch cabinet according to claim 3, characterized in that: The metal conductive layer is a copper-zinc alloy layer with a thickness of 62nm-132nm, and the mass ratio of copper to zinc in the copper-zinc alloy layer is 3:

2.

5. The high-protection low-voltage withdrawable switch cabinet according to claim 3 is characterized in that: A handle 1 is installed on the front of the connecting bottom plate (5), and a handle 2 is installed on the front of the fixing plate (10), and the handle 1 is located below the handle 2; The surfaces of the handles 1, 2 and 3 are all provided with anti-skid patterns, the anti-skid patterns are semicircular grooves distributed at equal intervals, the radius of the semicircular grooves is 2 mm-5 mm, and shock-absorbing rubber pads are provided between the handle 1 and the connecting bottom plate (5), between the handle 2 and the fixing plate (10), and between the handle 3 and the protective cabinet door 1 (13) and the protective cabinet door 2 (19), the thickness of the shock-absorbing rubber pads is 3 mm-8 mm.

6. The high-protection low-voltage withdrawable switch cabinet according to claim 1 is characterized in that: The fixing plate (10), the metal shielding cover (6) and the connecting bottom plate (5) are provided with inlet and outlet holes (16), and an inlet and outlet shielding assembly is installed inside the inlet and outlet holes (16), and the inlet and outlet shielding assembly is used to shield electromagnetic interference signals entering the switch cabinet through the inlet and outlet holes (16); The inlet and outlet wire shielding assembly comprises a stainless steel shielding sleeve installed inside the inlet and outlet wire hole (16), and the interior of the stainless steel shielding sleeve is filled with conductive rubber; Metal flanges are installed at both ends of the stainless steel shielding sleeve, and the metal flanges are connected to the cold-rolled steel plate outer shielding layer (1) through bolts.

7. A high-protection low-voltage withdrawable switch cabinet according to claim 6, characterized in that: An annular sealing gasket is arranged at the connection between the metal flange and the stainless steel shielding sleeve. The annular sealing gasket is made of fluororubber and has a thickness of 2mm-6mm. An outwardly protruding annular rib is arranged on the outer edge of the metal flange and has a height of 3mm-7mm.

8. The high-protection low-voltage withdrawable switch cabinet according to claim 1, characterized in that: A honeycomb brass ventilation plate (17) is embedded on the top of the cold-rolled steel plate outer shielding layer (1), the double-layer shielding assembly and the metal shielding cover (6), and an electromagnetic interference filter is installed on the bottom of the honeycomb brass ventilation plate (17).

9. A protection method for a high-protection low-voltage withdrawable switch cabinet according to any one of claims 1 to 6, characterized in that: The protection methods of low-voltage withdrawable switchgear are as follows: S1, installing the component on the top of the fixed plate (10) by means of a pull-out component installation assembly; S2, electromagnetic shielding protection is provided inside the switch cabinet through double-layer shielding components; S3. Use the cabinet door shielding assembly to provide electromagnetic shielding and sealing protection for the front of the switch cabinet; S4. Shield the electromagnetic interference signal entering the switch cabinet through the inlet and outlet holes (16) by using the inlet and outlet shielding assembly.

10. A protection method for a high-protection low-voltage withdrawable switch cabinet according to claim 9, characterized in that: In S2, the following steps are also included: S21, the outer shielding layer (1) of the cold-rolled steel plate performs preliminary shielding and blocking of external electromagnetic interference, and the triangular absorbing rubber block (2) is in the filling gap to absorb part of the electromagnetic radiation that passes through the outer shielding layer (1) of the cold-rolled steel plate; S22, the galvanized steel plate inner shielding layer (3) further shields the interior and cooperates with the cold-rolled steel plate outer shielding layer (1) and the triangular absorbing rubber block (2) to form a multi-layered electromagnetic shielding structure; In S3, the following steps are also included: S31, the electromagnetic sealing strip and the internal steel mesh on the inner edge of the cabinet door frame (12) enhance the structural strength and electromagnetic shielding performance, and prevent electromagnetic signals from leaking from the cabinet door gap; S32, the aluminum oxide film (14) on the front side of the protective cabinet door (13) protects the cabinet door surface and prevents surface charge accumulation, and the metallized polyester film (15) on the back side reflects and shields electromagnetic signals.

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