A temperature and humidity control system for substation control cabinets based on dynamic switching of multiple cold sources

Abstract

This invention provides a substation control cabinet temperature and humidity control system based on dynamic switching of multiple cold sources. The system includes a main cooling module, a refrigerant circulation module, internal heat exchange components, a natural cooling module, a control module, and an anti-condensation structure. The main cooling module is connected to an energy storage tank, which supplies refrigerant to the internal heat exchange components through the refrigerant circulation module. The natural cooling module bypasses the compressor for cooling under low-temperature conditions. The control module collects environmental data in real time and controls the coordinated operation of all components. This system features a compact structure, high control precision, low energy consumption, and strong adaptability, making it suitable for various substation terminal control cabinets.

Description

Technical Field

[0001] This utility model relates to the field of environmental control of smart grid equipment, specifically to a temperature and humidity control system for a substation control cabinet based on dynamic switching of multiple cold sources. Background Technology

[0002] With the advancement of the national smart grid construction, intelligent control cabinets are widely used in field equipment such as substation control layers and bay layers. These control cabinets are often deployed in outdoor or semi-outdoor environments, facing complex climatic interferences such as high temperature, severe cold, and high humidity. The cabinets integrate microprocessor-based protection, data acquisition, and communication electronic equipment, which are highly susceptible to environmental factors, resulting in condensation, overheating, or malfunctions.

[0003] Traditional control cabinet temperature and humidity regulation uses independent air conditioners, fans, or semi-enclosed cavities for temperature control, but it has the following shortcomings:

[0004] Independent systems have limited control precision and cannot achieve multi-point coordinated control;

[0005] Traditional air-cooled solutions have low heat exchange efficiency, high energy consumption, and difficulty in dehumidifying during humid seasons.

[0006] Fragmented deployment leads to high operation and maintenance costs and poor system reliability;

[0007] Lacking environmental adaptability, it cannot automatically switch cooling sources, resulting in energy waste.

[0008] Therefore, there is an urgent need to design a control cabinet temperature and humidity control system that can adapt to environmental changes, achieve centralized control, and is both energy-saving and highly reliable. Utility Model Content

[0009] To address the shortcomings of existing technologies, this utility model provides a substation control cabinet temperature and humidity control system based on dynamic switching of multiple cold sources. It features dual cold source switching, adaptive control, centralized layout, energy saving and high efficiency, thereby improving the safety and stability of the operating environment of the equipment inside the cabinet.

[0010] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0011] A substation control cabinet temperature and humidity control system based on dynamic switching of multiple cold sources includes a main cooling module, a refrigerant circulation module, an internal heat exchange component, a natural cooling module, a control module, and an anti-condensation structure. The main cooling module is connected to an energy storage box, and the energy storage box and the internal heat exchange component form a closed heat exchange loop through the refrigerant circulation module. The natural cooling module is connected in parallel with the main cooling module, and the control module is used to collect ambient temperature and humidity signals and control the system's operating status.

[0012] Preferably, the main refrigeration module includes a variable frequency compressor, an air-cooled finned tube condenser, an electronic expansion valve, and a plate evaporator, wherein the evaporator exchanges heat with cold water to provide a refrigerant.

[0013] Preferably, the refrigerant circulation module includes a variable frequency water pump, an electric regulating valve, and a temperature sensor. The outlet of the variable frequency water pump is connected to a serpentine coil via the electric regulating valve. The temperature sensor is located inside and outside the cabinet and is used to provide feedback for regulating the refrigerant flow rate.

[0014] Preferably, the heat exchange components inside the cabinet include a serpentine coil coated with a nano-hydrophobic coating and a high- and low-speed intelligent fan. The fan forces the air inside the cabinet to flow across the surface of the coil to achieve cooling and dehumidification. The coil is located in the middle of the main air duct of the control cabinet.

[0015] Preferably, the natural cooling module includes an electric three-way valve and a cooler, and the cold water circulation automatically switches to the natural cooling path under the command of the control module according to the external temperature and load conditions.

[0016] Preferably, the control module includes a central controller, as well as a temperature and humidity sensor group, an execution control unit, and a remote communication module electrically connected to the central controller.

[0017] Preferably, the anti-condensation structure includes a nano-micro drainage layer disposed on the outer wall of the heat exchange coil, and a nano-hydrophobic anti-condensation coating is applied to all refrigerant heat exchange surfaces to suppress condensation formation; at the same time, a condensation collection groove, a water guide pipe and a micro drainage pump are provided at the bottom of the coil. The drainage pump is used to collect and automatically discharge the condensate that accumulates at the bottom of the coil to prevent water droplets from accumulating and causing corrosion or short circuit hazards to the components inside the cabinet.

[0018] Preferably, the energy storage box is equipped with a flow guide baffle to form a hot and cold zone, which avoids direct mixing of the refrigerant return water and the outlet water, thereby improving the efficiency of cold energy utilization.

[0019] Preferably, the energy storage tank is equipped with a water quality adjustment module, including a physical filter, an ion exchanger, and a sterilization component, to ensure the quality of the refrigerant water.

[0020] Preferably, the control system supports remote configuration and multi-cabinet joint control, and the communication interface supports RS485 or Ethernet, enabling data exchange with the station control system.

[0021] Preferably, the temperature and humidity control system adopts a modular structure design, which facilitates quick disassembly and replacement during maintenance. It can also be flexibly expanded or combined according to the needs of different control cabinets, thereby adapting to various models and specifications of outdoor power cabinet equipment.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. Achieving multi-source fusion and dynamic switching to improve system operating efficiency: This utility model system integrates the compressor refrigeration circuit and the natural cooling channel in parallel structure. The control module collects ambient temperature information in real time. When the outside temperature is lower than the preset value, the compressor refrigeration is automatically turned off and only the natural cooling circuit is turned on to avoid unnecessary energy consumption. During high-temperature load stages, it automatically switches to compressor refrigeration operation to ensure a stable supply of cooling capacity, realizing intelligent and energy-saving switching of cold sources.

[0024] 2. Precise temperature and humidity control ensures stable equipment operation: This system employs a high-efficiency heat exchange assembly consisting of serpentine finned coils and a variable frequency fan within the cabinet, combined with a closed-loop refrigerant circulation system, achieving high heat exchange efficiency and rapid response. By configuring a dual-feedback temperature and humidity control unit, the system monitors the cabinet status in real time and executes PID regulation to control the cooling flow and air volume distribution, ensuring the target environment fluctuates within ±0.5℃ and ±3%RH, meeting the high-precision operating environment requirements of critical equipment.

[0025] 3. Enhanced anti-condensation capability, avoiding condensate corrosion and short-circuit risks: This invention introduces a nano-hydrophobic anti-condensation coating on the surface of the heat exchange component and sets up a condensation collection groove and a water guide pipe to achieve efficient guidance and discharge of condensate. A miniature automatic drainage pump is installed under the groove to continuously pump out condensate, avoiding safety hazards such as corrosion of electronic components and signal short circuits caused by water accumulation, significantly improving system safety and reliability.

[0026] 4. Modular deployment and multi-cabinet interconnection facilitate operation and maintenance and expansion: This system adopts a distributed modular structure design. Functional modules such as main unit refrigeration, refrigerant system, control unit and heat exchanger can be deployed independently or run in parallel cabinets, supporting rapid replacement and system upgrade. At the same time, it can be linked with the station control system through Ethernet or 485 bus to realize load sharing and status monitoring among multiple units, and is suitable for centralized control and remote operation and maintenance in various scenarios. Attached Figure Description

[0027] Figure 1 This is an overall structural diagram of the temperature and humidity control system of this utility model.

[0028] Figure 2 This is a schematic diagram of the working principle of the main unit's refrigeration system.

[0029] Figure 3 This is a schematic diagram of the refrigerant circulation module connection.

[0030] Figure 4 This is a schematic diagram of the heat exchange components inside the cabinet. Detailed Implementation

[0031] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0032] like Figure 1 As shown, the present invention provides a substation control cabinet temperature and humidity control system based on dynamic switching of multiple cold sources, including: a main cooling module 1, a refrigerant circulation module 2, a cabinet heat exchange component 3, a natural cooling module 4, a control module, an anti-condensation structure, and an energy storage box 7.

[0033] The main refrigeration module 1 includes a compressor 10, a condenser 11, an electronic expansion valve 12, and an evaporator 13. Its refrigerant circulation loop forms a cold energy exchange structure with the energy storage tank 7, which is used to prepare the refrigerant. The energy storage tank 7 forms a closed water circuit with the heat exchange components 3 inside the cabinet through the refrigerant circulation module 2. The refrigerant is driven by a variable frequency water pump and circulates within the system to complete the heat transfer.

[0034] The refrigerant circulation module 2 includes a variable frequency water pump 21, a temperature-controlled electric regulating valve 22, and a multi-branch distribution network. The variable frequency water pump is used to regulate the water supply flow rate, and the electric regulating valve adjusts the opening degree according to the load requirements inside the cabinet.

[0035] The heat exchange assembly 3 inside the cabinet includes a combination of a serpentine finned coil and a fan. The refrigerant flows through the inside of the coil, and the fan is positioned on the windward side of the coil. Forced airflow accelerates heat and humidity exchange between the air and the outer wall of the coil, thus regulating the temperature and humidity of the air inside the cabinet. To adapt to different heat load conditions, the fan supports switching between high and low speeds. It operates at low speed during low loads or when maintaining temperature and humidity to reduce energy consumption and noise, and switches to high speed during high temperature and humidity periods or when the equipment is generating high heat to improve heat exchange efficiency and dehumidification capacity.

[0036] To further improve operational reliability in high humidity environments, the outer wall of the coil is equipped with a nano-micro-drainage layer, and all refrigerant heat exchange surfaces are coated with an anti-condensation nano-coating, which can significantly reduce the risk of condensate accumulation. Condensate is diverted to the drainage module through a collection channel and a water guide pipe, effectively preventing condensation from causing short circuits or corrosion to the components inside the cabinet.

[0037] Natural cooling module 4 includes a bypass circuit and an electric three-way valve. When the ambient temperature is lower than the set value, the system automatically shuts down the compressor for cooling and introduces external cold air into the system through the natural cooling circuit to achieve cooling, thereby reducing energy consumption.

[0038] The intelligent control module includes a PLC, temperature and humidity sensors, pressure transmitters, flow meters, and a remote communication interface. Based on the collected temperature, humidity, load demand, and refrigerant status parameters, the PLC performs model prediction and logical judgment, outputs control commands to adjust the operating status of each module, and achieves on-demand temperature and humidity control, avoiding excessive adjustment that would lead to energy waste.

[0039] In addition, to ensure system stability and maintainability, the energy storage tank 7 is equipped with a flow guide baffle to create hot and cold zones, preventing direct mixing of return water and supply water. A water treatment module, including a filter, sterilizer, and ion exchanger, is installed at the bottom of the tank to improve the stability of the refrigerant water quality.

[0040] The system adopts a modular design, and each functional unit supports independent replacement and rapid installation.

[0041] In actual operation, this utility model system can switch between compressor cooling and natural cooling modes according to changes in ambient temperature and load inside the cabinet, achieving all-weather, low-energy consumption, and high-precision environmental regulation. It is widely applicable to intelligent terminal control cabinets in substations with various high reliability requirements.

[0042] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. Any obvious variations or modifications derived from the technical solutions of this utility model are still within the protection scope of this utility model.

Claims

1. A substation control cabinet temperature and humidity control system based on dynamic switching of multiple cold sources, characterized in that: It includes a main cooling module, a refrigerant circulation module, an internal heat exchange component, a natural cooling module, a control module, and an anti-condensation structure. The main cooling module is connected to an energy storage tank. The energy storage tank supplies refrigerant to the internal heat exchange component through the refrigerant circulation module. The natural cooling module is used to bypass the compressor for cooling under low ambient temperature conditions. The control module is used to collect environmental data in real time and control the coordinated operation of various components.

2. The system according to claim 1, characterized in that: The refrigerant circulation module includes a variable frequency water pump, a temperature-controlled electric regulating valve, and a multi-branch distribution network. The variable frequency water pump is used to regulate the water supply flow rate, and the electric regulating valve adjusts the opening degree according to the load requirements inside the cabinet.

3. The system according to claim 1, characterized in that: The heat exchange components inside the cabinet include a serpentine finned coil, high and low speed fans, and a temperature and humidity linkage control module. The fan speed is adjusted based on the load conditions to drive air through the surface of the coil for forced convection heat exchange.

4. The system according to claim 1, characterized in that: The natural cooling module includes an electric three-way valve and a bypass circuit structure. The electric three-way valve switches the operating mode according to the ambient temperature to link the compressor refrigeration and natural cold source cooling.

5. The system according to claim 1, characterized in that: The control module includes a central controller, as well as a temperature and humidity sensor group, an execution control unit, and a remote communication module electrically connected to the central controller.

6. The system according to claim 1, characterized in that: The anti-condensation structure includes a nano-micro drainage layer disposed on the outer wall of the heat exchange coil and a nano-hydrophobic anti-condensation coating on the refrigerant heat exchange surface, and is provided with a condensation collection groove, a water guide pipe and a micro drainage pump. The drainage pump is used to automatically discharge the condensate collected below the coil.

7. The system according to claim 1, characterized in that: The energy storage tank is equipped with a flow guide baffle to form hot and cold zones, so as to avoid direct mixing of refrigerant return water and outlet water.

8. The system according to claim 1, characterized in that: The energy storage tank is equipped with a water quality regulation module, including a physical filter, an ion exchanger, and a sterilization component.

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