High electromagnetic resistance wide temperature protection sewage plant field power intelligent agent control cabinet hardware device
Patent Information
- Application Number
- CN202611244012.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-08-17
- Publication Date
- 2026-10-13
AI Technical Summary
传统PLC控制柜存在以下问题：（1）防护等级低，一般为IP54以下，无法长期抵御户外雨淋与潮湿；（2）无分层电磁屏蔽结构，柜内采集信号受变频器谐波干扰产生漂移，控制精度下降；（3）无一体化除湿散热结构，柜内凝露导致线路短路、器件腐蚀，夏季高温导致控制器死机；（4）需配套独立配电箱，现场安装工程量大，接线复杂
（1）三层分层电磁屏蔽，抗干扰能力强。外层防雨钣金层、空气隔热层、电磁屏蔽夹层（镀锌钢板/铜网复合）与内层设备安装腔构成三层屏蔽结构，屏蔽夹层连续接地，对变频器与大功率电机谐波干扰的屏蔽效能不低于40dB，柜内采集信号误差较普通控制柜降低90%。
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Figure CN122907984A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the technical field of hardware protection structure for wastewater treatment automatic control equipment, specifically relating to a hardware device for a wastewater treatment plant on-site power intelligent agent control cabinet with high electromagnetic resistance and wide temperature protection, specifically referring to a dedicated cabinet structure for an open-air distributed power-type intelligent agent. Background Technology
[0002] Municipal wastewater treatment plants have numerous high-power electrical equipment such as pumps, fans, and frequency converters, which generate strong harmonics and electromagnetic interference during operation. Simultaneously, the plant's automated control equipment is mostly installed in open-air environments near process structures, where there are large temperature differences between day and night, nighttime condensation, humid air, and corrosive gases. These electromagnetic and environmental factors pose a severe challenge to the on-site control equipment. Traditional PLC control cabinets have the following problems: (1) Low protection level, generally below IP54, which cannot withstand outdoor rain and humidity for a long time; (2) No layered electromagnetic shielding structure, the signal collected in the cabinet is affected by the harmonic interference of the frequency converter and drifts, resulting in a decrease in control accuracy; (3) No integrated dehumidification and heat dissipation structure, condensation in the cabinet causes short circuits and corrosion of components, and high temperature in summer causes the controller to crash; (4) Requires a separate distribution box, which results in a large amount of on-site installation work and complicated wiring. With the application of distributed monitoring and control architecture in municipal wastewater treatment plants, a large number of control devices need to be installed directly in the open at the process site. The structure of traditional control cabinets can no longer meet the requirements for long-term reliable operation in environments with strong electromagnetic fields, wide temperature ranges, and humid and corrosive conditions. Therefore, there is an urgent need for a dedicated control cabinet hardware device with layered electromagnetic shielding, integrated dehumidification and heat dissipation, integrated power distribution, and isolation between strong and weak currents. Summary of the Invention
[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a hardware device for a wastewater treatment plant on-site power intelligent control cabinet with high electromagnetic resistance and wide temperature protection. Through a three-layer electromagnetic shielding structure, an integrated dehumidification and heat dissipation module, an integrated power distribution base, and a strong and weak current isolation wiring structure, the control cabinet can operate stably for a long time in the open-air environment of wastewater treatment plants with strong electromagnetic fields, wide temperature range, and humid and corrosive conditions. This achieves the technical effect of reducing signal acquisition error by 90% and eliminating controller crashes. To achieve the above objectives, the present invention adopts the following technical solution: a hardware device for a wastewater treatment plant on-site power intelligent control cabinet with high electromagnetic resistance and wide temperature protection, comprising a cabinet, an integrated dehumidification and heat dissipation module, a power controller mounting base, an integrated power distribution base, and a strong and weak current isolation wiring structure; the cabinet is provided with an outer rainproof sheet metal layer, an air insulation layer, an electromagnetic shielding interlayer, and an inner equipment mounting cavity from the outside to the inside; the integrated dehumidification and heat dissipation module includes a semiconductor cooling chip, a condensate collection tank, a drain pipe, a temperature control fan, a circulating air duct, and a temperature and humidity sensor; the overall protection level of the cabinet is IP65, adaptable to an outdoor ambient temperature range of -40℃ to +70℃. Compared with the prior art, the present invention has the following significant advantages: (1) Three-layer electromagnetic shielding with strong anti-interference ability. The outer rainproof sheet metal layer, the air heat insulation layer, the electromagnetic shielding interlayer (galvanized steel plate / copper mesh composite) and the inner equipment installation cavity constitute a three-layer shielding structure. The shielding interlayer is continuously grounded, and the shielding effectiveness against harmonic interference from frequency converters and high-power motors is not less than 40dB. The signal acquisition error inside the cabinet is reduced by 90% compared with ordinary control cabinets. (2) Integrated wide-temperature dehumidification and heat dissipation to eliminate condensation and high-temperature shutdown. The semiconductor cooling chip and temperature control fan are linked and automatically start when the humidity inside the cabinet is greater than 70%RH or the temperature is higher than 45℃. The condensate is discharged outside the cabinet through the collection tank and drain pipe. The air insulation layer blocks the external temperature conduction, so that the equipment inside the cabinet can operate stably for a long time in the ambient temperature range of -40℃ to +70℃. (3) Integrated power supply, reducing installation workload. The cabinet integrates an integrated power distribution base, which can be directly connected to the 380V industrial power supply in the factory area without the need for an additional power distribution box; the waterproof cable glands enable quick plug-in and plug-out of cables on site, greatly reducing the amount of on-site wiring and installation work. (4) Physical isolation between strong and weak currents ensures safe and reliable operation. Strong current terminal blocks and weak current signal terminals are arranged in separate zones, separated by isolation barriers, with a physical isolation distance of not less than 50mm. Weak current signals are connected using isolated terminals to prevent strong current from entering the weak current circuit and causing acquisition drift and equipment damage. (5) IP65 fully sealed outdoor protection. The rainproof eaves, double-layer sheet metal rainproof door, three-point door lock, fully sealed waterproof strip and waterproof breather valve constitute a complete protection system, suitable for long-term outdoor installation in sewage treatment plants. Attached Figure Description Figure 1 This is a structural diagram of the cabinet of the present invention; the diagram shows a rainproof eaves (11), a double-layer sheet metal rainproof door (12), a touch screen window (13), a waterproof breathing valve (14), a three-point door lock (15), a fully sealed waterproof strip (16), and a floor-mounted outdoor mounting base (17). Figure 2 This is a cross-sectional view of the layered electromagnetic shielding structure of the cabinet of the present invention; the figure shows the stacked structure of the outer rainproof sheet metal layer (21), the air insulation layer (22), the electromagnetic shielding interlayer (23), the inner equipment mounting cavity (24), the power controller (25) and the terminal block (26) and the shielding path of external harmonic interference. Figure 3 This is a cross-sectional view of the dehumidification and heat dissipation integrated module of the present invention; the figure shows the structure and control logic of the semiconductor cooling chip (31), condensate collection tank (32), drain pipe (33), temperature control fan (34), circulating air duct (35) and temperature and humidity sensor (36). Figure 4This is a diagram of the mounting base and terminal arrangement of the power controller of the present invention. The diagram shows the arrangement of the mounting plate (40), standard guide rail (41), power controller mounting base (42), high-voltage terminal block (43), isolation fence (44), low-voltage signal terminal (45), dual communication waterproof interface (46) and cable waterproof gland (47) inside the cabinet. Detailed Implementation The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention. [Example 1] Overall Structure of the Cabinet like Figure 1 As shown, the control cabinet in this embodiment adopts a double-layer sheet metal structure with external dimensions of 800mm × 600mm × 1800mm (width × depth × height). A rainproof eaves 11 is installed on the top, and a double-layer sheet metal rainproof door 12 is installed on the front. A touch screen window 13 is embedded in the door, and the door seams are secured with fully sealed waterproof strips 16 and a three-point door lock 15. A waterproof breather valve 14 is installed on the lower side of the cabinet to balance the air pressure inside and outside the cabinet while preventing liquid water from entering. The cabinet is fixed to the side of the process structure via a floor-mounted outdoor mounting base 17. The overall protection level is IP65. like Figure 2 As shown, the cabinet, from the outside in, consists of an outer rainproof sheet metal layer 21 (1.5mm cold-rolled steel plate with powder coating), an air insulation layer 22 (20mm air gap), an electromagnetic shielding layer 23 (0.8mm galvanized steel plate and copper mesh composite, continuously welded and single-point grounded), and an inner equipment mounting cavity 24. Harmonic interference generated by external frequency converters and high-power motors is reflected by the outer layer, absorbed by the air gap, and discharged by grounding, with a shielding effectiveness of not less than 40dB. [Example 2] Integrated Dehumidification and Heat Dissipation Module like Figure 3 As shown, the integrated dehumidification and heat dissipation module is installed on the inner side wall of the cabinet. Temperature and humidity sensor 36 monitors the temperature and humidity inside the cabinet in real time. When the relative humidity exceeds 70%RH or the temperature exceeds 45℃, the control logic automatically activates the semiconductor cooling chip 31 and the temperature-controlled fan 34. Air inside the cabinet flows through the circulating air duct 35 to the cold end of the cooling chip; water vapor condenses and collects in the condensate collection tank 32, then is discharged outside the cabinet through the drain pipe 33. Heat from the hot end of the cooling chip is discharged by the fan. This module enables the equipment inside the cabinet to operate without condensation under ambient temperatures ranging from -40℃ to +70℃ and a day-night temperature difference exceeding 25℃. [Example 3] Mounting base and strong / weak current isolation wiring like Figure 4As shown, the mounting plate 40 inside the cabinet is fixed with a standard guide rail 41 to a power controller mounting base 42, and the power controller intelligent body is inserted into the mounting base 42; the high-voltage terminal block 43 is arranged on the lower left side of the mounting plate and connected to the 380V power supply of the factory area; the low-voltage signal terminal 45 is arranged on the right side and is an isolated terminal; the isolation fence 44 is set between the high-voltage area and the low-voltage area, with a physical isolation distance of not less than 50mm; the dual communication waterproof interface 46 (wired Ethernet and 4G antenna) is arranged next to the mounting base 42; the bottom of the cabinet is equipped with 6 waterproof cable glands 47 for quick plug-in and plug-out of cables on site. This device, equipped with 20 distributed power intelligent agents, was applied to the Yaodu Municipal Wastewater Treatment Plant. It was installed and operated outdoors for 2 months in an ambient temperature range of -2℃ to 65℃. There were no condensation or signal interference issues, and the controllers did not crash. Compared with ordinary control cabinets, the signal acquisition error was reduced by 90%. The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention should still fall within the scope of the present invention.
Claims
1. A hardware device for a wastewater treatment plant's on-site intelligent power control cabinet with high electromagnetic resistance and wide temperature protection, characterized in that, include: The cabinet is provided with an outer rainproof sheet metal layer (21), an air insulation layer (22), an electromagnetic shielding interlayer (23), and an inner equipment mounting cavity (24) from the outside to the inside, forming a three-layer electromagnetic shielding structure. The electromagnetic shielding interlayer (23) is continuously grounded to isolate the harmonic interference generated by the frequency converter and high-power motor of the sewage treatment plant. The dehumidification and heat dissipation integrated module is set in the cabinet and includes a semiconductor cooling chip (31), a condensate collection tank (32), a drain pipe (33), a temperature control fan (34), a circulating air duct (35), and a temperature and humidity sensor (36). It automatically starts when the humidity or temperature in the cabinet exceeds the set threshold to eliminate condensation in the cabinet. The power controller mounting base (42) is fixed in the inner equipment mounting cavity (24) via a standard guide rail (41) and is used to install the power controller intelligent body (25). The integrated power distribution base is directly connected to the 380V industrial power supply of the plant area and integrates a circuit breaker and a power metering unit. The strong and weak current isolation wiring structure includes a strong current terminal block (43), an isolation barrier (44) and a weak current signal terminal (45). The weak current signal terminal (45) is an isolation terminal, and the strong current circuit and the weak current signal circuit are physically isolated. The overall protection level of the cabinet is IP65, which is suitable for long-term operation in an outdoor environment temperature range of -40℃ to +70℃.
2. The apparatus according to claim 1, characterized in that, The electromagnetic shielding interlayer (23) adopts a composite structure of galvanized steel plate and copper mesh. The interlayer is continuously electrically connected and grounded at a single point. The shielding effectiveness against electromagnetic interference in the 30MHz~1GHz frequency band is not less than 40dB.
3. The apparatus according to claim 1, characterized in that, The cabinet includes a rainproof eaves (11), a double-layer sheet metal rainproof door (12), a touch screen window (13), a waterproof breathing valve (14), a three-point door lock (15), and a fully sealed waterproof strip (16). The double-layer sheet metal rainproof door (12) is filled with heat insulation material.
4. The apparatus according to claim 1, characterized in that, The control logic of the dehumidification and heat dissipation integrated module is as follows: when the relative humidity inside the cabinet is greater than 70%RH or the temperature inside the cabinet is higher than 45℃, the semiconductor cooling chip (31) and the temperature control fan (34) are automatically started, and the condensate is discharged outside the cabinet through the condensate collection tank (32) and the drain pipe (33).
5. The apparatus according to claim 1, characterized in that, The high-voltage terminal block (43) and the low-voltage signal terminal (45) are arranged in separate zones with a physical isolation distance of not less than 50mm. The isolation barrier (44) is set between the high-voltage zone and the low-voltage zone.
6. The apparatus according to claim 1, characterized in that, The bottom of the cabinet is equipped with multiple waterproof cable glands (47), and the field sensors and actuator cables can be quickly plugged in and unplugged through the waterproof cable glands (47), reducing the amount of field wiring work.
7. The apparatus according to claim 1, characterized in that, The cabinet is equipped with a floor-mounted outdoor mounting base (17), and the cabinet is directly installed in the open environment next to the process structure of the sewage treatment plant via the floor-mounted outdoor mounting base (17).
8. The apparatus according to claim 1, characterized in that, The power controller mounting base (42) is provided with dual communication waterproof interfaces (46) on the side, including a wired Ethernet waterproof interface and a 4G wireless module waterproof antenna interface.