Temperature regulation and control system for operating environment of frequency converter

Abstract

The invention discloses a frequency converter operating environment temperature regulation and control system, which is characterized in that a cooling fan is arranged on a frequency converter, and a first air inlet is communicated with the upstream of a heating element; a heat exchanger and a circulating fan are arranged in a shell of the air-water cooling device, the shell is provided with a second air inlet and a second air outlet, cooling water flows through the heat exchanger through a water inlet and a water outlet, and the circulating fan drives air to flow through the heat exchanger and then is fed into the frequency converter chamber through the second air outlet; a first rainproof shutter air opening with a first butterfly valve is formed in one end of the heat dissipation air channel; one end of the heat-conducting air duct is provided with a second butterfly valve for control communication, and the other end of the heat-conducting air duct is communicated with the second air inlet through a second rainproof shutter air port with a third butterfly valve. By switching the opening and closing combination of the butterfly valves, an outdoor fresh air cooling mode, an indoor air circulation cooling mode or a mixed cooling mode is achieved, outdoor humid and hot air is effectively isolated, air-water cooling is efficiently utilized, and the main purpose is to ensure stable operation of the frequency converter in a high-temperature environment and improve the heat dissipation efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of temperature control equipment. More particularly, the present application relates to a frequency converter operating environment temperature regulation system. BACKGROUND

[0002] Current industrial frequency converters generally use forced air cooling or air conditioning cooling schemes to maintain operating temperature. Forced air cooling relies on direct exchange of indoor and outdoor air: when the outdoor temperature is low, new air is introduced through louvers to cool the frequency converter and hot air is discharged, which is energy-saving but has a fatal flaw - in high temperature and high humidity environments, hot and humid air flows into the equipment with the new air, which may cause condensation to cause circuit short circuit, or even insulation failure. While closed air conditioning cooling can isolate moisture, it has extremely high energy consumption, and air conditioning failure will directly cause the system to overheat and malfunction. More importantly, the traditional scheme lacks a heat recovery mechanism: in the forced air cooling mode, the frequency converter exhaust at 40-60℃ is directly discharged to the atmosphere, resulting in a large amount of low-grade heat waste; in the air conditioning mode, additional power consumption is required to offset this heat, which doubles the energy burden.

[0003] Existing improved technologies attempt to introduce air cooling heat exchangers, but their single operating mode cannot adapt to complex working conditions: fixed air ducts are forced to switch to pure internal circulation in high outdoor temperatures, and the heat exchanger's cooling efficiency is rapidly reduced due to continuous processing of high-temperature return air; and simple fresh air / return air switching valves are prone to air flow short circuit or moisture back infiltration during mode conversion. These problems are particularly prominent in high-temperature workshops such as metallurgy and chemical industry - the frequency converter room is in an environment above 45℃ all year round, and the heat dissipation system is running in an extreme state for a long time, resulting in equipment derating and frequent maintenance failures, which has become an industry problem.

[0004] Therefore, there is an urgent need to develop a temperature control system for the frequency converter operating environment that can simultaneously achieve three core breakthroughs: complete isolation of external hot and humid air, efficient cooling in extreme high temperatures, and deep recovery of frequency converter waste heat. SUMMARY

[0005] An object of the present application is to solve at least the above problems and to provide at least the advantages to be described later.

[0006] Another object of the present application is to provide a frequency converter operating environment temperature regulation system that aims to solve the technical problem of unstable operation of the frequency converter due to the decrease in heat dissipation efficiency caused by the high temperature in the frequency converter room in high temperature weather.

[0007] In order to achieve these objects and other advantages according to the present application, a frequency converter operating environment temperature regulation system is provided, which comprises: a frequency converter arranged in a frequency converter room; a heat dissipation fan arranged on the frequency converter, and a first air inlet of the heat dissipation fan is in communication with the airflow upstream of the heat generating element; The air-water cooling device comprises a shell, a heat exchanger arranged in the shell, a circulating fan arranged in the shell, and a cooling water inlet and a cooling water outlet arranged on the shell; a second air inlet and a second air outlet are arranged on the shell; the cooling water inlet is communicated with a water inlet end of the heat exchanger, and the cooling water outlet is communicated with a water outlet end of the heat exchanger; the circulating fan is arranged in the shell and is used to drive air to flow through the heat exchanger; the circulating fan is located at the side of the second air inlet; an air outlet of the heat exchanger is communicated with the frequency converter chamber through the second air outlet; The heat dissipation air duct is communicated with the second air outlet of the heat dissipation fan at one end and extends to the outside of the frequency converter chamber at the other end; The heat conduction air duct is communicated with one side of the heat dissipation air duct at one end and is communicated with the second air inlet at the other end; The first rainproof louver air inlet is arranged at the other end of the heat dissipation air duct; The second rainproof louver air inlet is arranged at one side of the heat conduction air duct; The first butterfly valve is connected with the first rainproof louver air inlet and the inside of the heat dissipation air duct; The second butterfly valve is arranged at one end of the heat conduction air duct and controls whether the heat conduction air duct is communicated with the heat dissipation air duct; The third butterfly valve is connected with the second rainproof louver air inlet and the second air inlet.

[0008] Preferably, the frequency converter operating environment temperature regulation system further comprises: The temperature monitoring unit comprises an outdoor temperature sensor and an indoor temperature sensor; The electric control device is electrically connected with the first butterfly valve, the second butterfly valve, the third butterfly valve, the fan and the temperature monitoring unit; When the detection value of the outdoor temperature sensor is lower than the detection value of the indoor temperature sensor, the first butterfly valve and the third butterfly valve are opened, and the second butterfly valve is closed; when the detection value of the outdoor temperature sensor is higher than the detection value of the indoor temperature sensor, the first butterfly valve and the third butterfly valve are closed, and the second butterfly valve is opened.

[0009] Preferably, the frequency converter operating environment temperature regulation system, the blade inclination angles of the first rainproof louver air inlet and the second rainproof louver air inlet are both 30°-45°, and a silica gel sealing strip is embedded in the inside of each air inlet.

[0010] Preferably, the frequency converter operating environment temperature regulation system, the first butterfly valve, the second butterfly valve and the third butterfly valve are all driven to open and close by a stepping motor, and the opening and closing response time is ≤0.5 seconds.

[0011] Preferably, the frequency converter operating environment temperature regulation system, the circulating fan is a variable frequency fan, and the rotating speed of the circulating fan is increased with the increase of the indoor temperature.

[0012] Preferably, the variable frequency drive operating environment temperature regulation system is provided with a 80-100 mesh stainless steel filter screen in the cooling water inlet.

[0013] Preferably, the variable frequency drive operating environment temperature regulation system further comprises a normally open fireproof valve arranged in the heat dissipation air duct; the normally open fireproof valve is electrically connected with the electric control device; when the indoor temperature sensor or the outdoor temperature sensor detects a value reaching 70 DEG C, the electric control device controls the normally open fireproof valve to close.

[0014] Preferably, the variable frequency drive operating environment temperature regulation system, the electric control device is further set to dynamically adjust the temperature difference threshold T used for controlling the switching of the first butterfly valve, the second butterfly valve and the third butterfly valve according to different preset temperature intervals of the detection value of the outdoor temperature sensor, and execute corresponding instructions. When the detection value of the outdoor temperature sensor is ≤ the first preset temperature threshold L (L is 5 DEG C to 10 DEG C), the temperature difference threshold T1 (T1 is 0.5 DEG C to 2 DEG C) is set, and: If the detection value of the outdoor temperature sensor is lower than the detection value of the indoor temperature sensor, and the difference between the two reaches or exceeds T1, the first butterfly valve and the third butterfly valve are opened, and the second butterfly valve is closed. If the detection value of the outdoor temperature sensor is higher than the detection value of the indoor temperature sensor, or the difference between the two is less than T1, the first butterfly valve and the third butterfly valve are closed, and the second butterfly valve is opened. When the detection value of the outdoor temperature sensor is > the first preset temperature threshold L and ≤ the second preset temperature threshold H (H is 25 DEG C to 30 DEG C), the temperature difference threshold T2 (T2 is 2 DEG C to 4 DEG C) is set, and: If the detection value of the outdoor temperature sensor is lower than the detection value of the indoor temperature sensor, and the difference between the two reaches or exceeds T2, the first butterfly valve and the third butterfly valve are opened, and the second butterfly valve is closed. If the detection value of the outdoor temperature sensor is higher than the detection value of the indoor temperature sensor, or the difference between the two is less than T2, the first butterfly valve and the third butterfly valve are closed, and the second butterfly valve is opened. When the detection value of the outdoor temperature sensor is > the second preset temperature threshold H, the temperature difference threshold T3 (T3 is 4 DEG C to 6 DEG C) is set, and: If the detection value of the outdoor temperature sensor is lower than the detection value of the indoor temperature sensor, and the difference between the two reaches or exceeds T3, the first butterfly valve and the third butterfly valve are opened, and the second butterfly valve is closed. If the detection value of the outdoor temperature sensor is higher than the detection value of the indoor temperature sensor, or the difference between the two is less than T3, the first butterfly valve and the third butterfly valve are closed, and the second butterfly valve is opened. The temperature difference threshold satisfies: T1 < T2 < T3.

[0015] The present application at least includes the following beneficial effects: 1. The present invention constructs a physically isolated dual-circulation channel through the parallel layout of the heat dissipation duct and the heat conduction duct and the precise control of the butterfly valve. The heat dissipation duct extends directly to the outside to ensure the rapid discharge of high-temperature exhaust gas; the heat conduction duct acts as a bypass to guide part of the hot air flow to the air-water cooling device, forming a heat recovery hub. The structural design of the temperature control system of the present invention not only realizes a rigid path for directional heat conduction, but also gives the system topology variability through the switching of the butterfly valve, so that the introduction of fresh air, internal circulation cooling or mixed mode can all be completed without interference through a purely mechanical structure. 2. The first rain-proof louver vent is rigidly connected to the end of the heat dissipation duct, forming the primary waterproof barrier. Its tilted blades, combined with the silicone sealing strip, prevent rainwater infiltration while maintaining unimpeded airflow. The second rain-proof louver vent is independently located on the side of the heat transfer duct, forming a secondary protection node with the third butterfly valve. The dual-vent physical isolation design avoids the risk of a single point of failure, and the elastic compression properties of the silicone sealing strip ensure complete isolation of external moisture when the butterfly valve is closed, eliminating the condensation risk caused by reverse infiltration of moist and hot air from the structural root. 3. The air-to-water cooling system's housing integrates the heat exchanger and circulating fan into a sealed unit. The second air inlet is directly connected to the heat transfer duct, and the second air outlet is directed toward the inverter's heating zone. This closed-flow design forces airflow to follow a strict "heat transfer duct → circulating fan → heat exchanger → inverter compartment" path, eliminating the risk of short-circuiting. The circulating fan's placement on the air inlet side creates negative pressure, enhancing heat recovery stability. The direct connection between the cooling water port and the heat exchanger shortens the refrigerant transfer path and maximizes the use of water temperature differences. 4. The first butterfly valve anchors the outdoor exhaust terminal, the third butterfly valve guards the fresh air inlet, and the second butterfly valve serves as the switching hub for the dual air ducts. The three valves are spatially distributed to form a "triangular control node," allowing the airflow network to be reconfigured simply by opening and closing them. When the second butterfly valve is closed, air is forced out (fresh air mode is activated); when it is open, an internal circulation loop is formed (heat transfer mode is activated). This purely mechanical linkage mechanism avoids complex control logic, achieving inherently safe switching of system operating modes based solely on the valve opening and closing angles. 5. The present invention further provides a temperature monitoring unit and an electronic control device. Through real-time monitoring of the outdoor / indoor temperature sensors and the linked control of the electronic control device, the system can adaptively select the optimal cooling mode. Regardless of the temperature difference between day and night or the change of seasons, it can ensure that the inverter room is always within the appropriate operating temperature range, effectively coping with complex and changing external climate conditions. 6、The application further sets a dynamic threshold adjustment mechanism to give the system climate self-adaptive intelligence, accurately avoids the decision risk of the traditional fixed threshold in extreme weather by establishing the correlation mapping of the temperature difference threshold and the outdoor temperature, and automatically reduces the temperature difference determination standard when the outdoor temperature approaches the freezing point in the cold season, so as to more sensitively capture the short-term temperature rise window, and meanwhile, relies on the preheating of the air-water cooling device to the fresh air to form a freeze-proof barrier; in the hot summer, the switching threshold is greatly increased, and the fresh air is only used when there is a significant low-temperature advantage outside, so as to block the attack of hot and humid air from the source. The control strategy which intelligently evolves with the seasons can not only fully absorb the natural cold source in spring and autumn to realize efficient energy saving, but also can build a dynamic protection network in winter and summer, completely solves the problem of the fixed threshold scheme that hesitates when it should be switched and blindly responds when it should not be switched, so that the frequency converter cooling system truly has the ability to harmoniously coexist with the natural environment.

[0016] Other advantages, objects, and features of the application will be apparent from the following specification, and will be appreciated by those skilled in the art. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 The structural schematic diagram of the frequency converter operating environment temperature regulation system described in the application; Fig. 2 The structural schematic diagram of the specific application scene of the frequency converter operating environment temperature regulation system described in the application.

[0018] Explanation of reference numerals: 1-frequency converter; 2-frequency converter; 21-heat dissipation fan; 3-air-water cooling device; 31-heat exchanger; 32-circulating fan; 4-heat dissipation air duct; 41-first rainproof louver air outlet; 42-first butterfly valve; 43-fire damper; 5-heat conduction air duct; 51-second rainproof louver air outlet; 52-second butterfly valve; 53-third butterfly valve; 61-outdoor temperature sensor; 62-indoor temperature sensor. DETAILED DESCRIPTION

[0019] The application will be further described in detail below with reference to the accompanying drawings and examples, so that those skilled in the art can implement the application according to the description.

[0020] It should be understood that the terms such as "have", "contain" and "include" used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0021] It should be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials can be obtained from commercial channels unless otherwise specified.

[0022] In the description of the present application, the terms "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0023] As shown in Figs. 1-2 The present application provides a frequency converter operating environment temperature regulation system, which comprises: a frequency converter (2) arranged in a frequency converter room; a heat dissipation fan (21) arranged on the frequency converter (2), and a first air inlet of the heat dissipation fan (21) being in communication with the airflow upstream of the heat generating element; an air-water cooling device (3) comprising a shell, a heat exchanger (31) arranged in the shell, a circulating fan (32) arranged in the shell, and a cooling water inlet and a cooling water outlet arranged on the shell; wherein a second air inlet and a second air outlet are arranged on the shell; the cooling water inlet is in communication with a water inlet end of the heat exchanger (31), and the cooling water outlet is in communication with a water outlet end of the heat exchanger (31); the circulating fan (32) is arranged in the shell and is used to drive air to flow through the heat exchanger (31); the circulating fan (32) is located on one side of the second air inlet; an air outlet of the heat exchanger (31) is in communication with the frequency converter room through the second air outlet; a heat dissipation air duct (4) having one end in communication with the second air outlet of the heat dissipation fan (21) and the other end extending to outside of the frequency converter room; a heat conduction air duct (5) having one end in communication with one side of the heat dissipation air duct (4) and the other end in communication with the second air inlet; a first rainproof louver air inlet (41) arranged at the other end of the heat dissipation air duct (4); a second rainproof louver air inlet (51) arranged on one side of the heat conduction air duct (5); a first butterfly valve (42) connecting the first rainproof louver air inlet (41) and the inside of the heat dissipation air duct (4); a second butterfly valve (52) arranged at one end of the heat conduction air duct (5) and used to control whether the heat conduction air duct (5) is in communication with the heat dissipation air duct (4); a third butterfly valve (53) connecting the second rainproof louver air inlet (51) and the second air inlet.

[0024] The traditional variable frequency converter cooling scheme generally adopts a single air duct design: when the outdoor temperature is suitable, the louver is directly opened to introduce fresh air to cool the equipment and then discharge hot air; when the temperature is high, the air duct is closed to switch to air conditioning cooling mode. This structure has a fundamental defect - the fresh air mode cannot isolate the invasion of hot and humid air, resulting in the risk of equipment condensation; the air conditioning mode is continuously energy-consuming and relies on external refrigeration units, resulting in high failure rate and cost increase. The present application completely breaks through the above technical shackles through the unique parallel structure of double air ducts and the air-water cooling hub.

[0025] The variable frequency converter operating environment temperature regulation system provided by the present application sets a cooling fan upstream of the heat generating element of the variable frequency converter, and the exhaust port of the cooling fan is bifurcated to form two independent paths: the main path is a cooling air duct extending to the outdoor, and the terminal is provided with a first rainproof louver air inlet with a butterfly valve; the branch path is connected to the second air inlet of the air-water cooling device through a heat conduction air duct. The air-water cooling device is a sealed unit, and a circulating fan is built-in to drive the airflow to flow through the heat exchanger, and then sprayed to the core area of the variable frequency converter through the second exhaust port after cooling.

[0026] Further, the present application sets three butterfly valves: the first butterfly valve is arranged at the other end (outlet) of the cooling air duct, the second butterfly valve is arranged at one end of the heat conduction air duct (the end communicating with the cooling air duct, i.e. the inlet of the heat conduction air duct), and the third butterfly valve is arranged at the second rainproof louver air inlet; the first butterfly valve controls the outdoor discharge, the third butterfly valve controls the fresh air inlet, and the second butterfly valve bridges the cooling air duct and the heat conduction air duct, and the three cooperate to reconstruct the airflow network.

[0027] When the outdoor temperature is lower than the indoor temperature, the second butterfly valve is closed, the first butterfly valve and the third butterfly valve are opened, the hot airflow generated by the heat generating element of the variable frequency converter enters the first air inlet of the cooling fan, enters the cooling air duct through the first exhaust port of the cooling fan, and is discharged outside the variable frequency converter through the first butterfly valve; at the same time, the outdoor cold air enters the heat conduction air duct through the third butterfly valve, enters the shell through the second air inlet, and then enters the variable frequency converter room through the second exhaust port in sequence via the circulating fan and the heat exchanger; (the hot airflow generated by the variable frequency converter is directly discharged to the outdoor, and the outdoor cold air is introduced into the air-water cooling device for further cooling, and then introduced into the variable frequency converter room) When the outdoor temperature is higher than the indoor temperature, the second butterfly valve is opened, the first butterfly valve and the third butterfly valve are closed, the hot airflow generated by the heat generating element of the variable frequency converter enters the first air inlet of the cooling fan, enters the cooling air duct through the first exhaust port of the cooling fan, and then enters the shell through the heat conduction air duct and the second air inlet, and then enters the variable frequency converter room through the second exhaust port in sequence via the circulating fan and the heat exchanger; (irrespective of the outdoor, the hot airflow generated by the variable frequency converter is directly introduced into the air-water cooling device through the cooling channel and the heat conduction channel for cooling, and then recycled back to the variable frequency converter room); When the outdoor temperature is low (such as in spring and autumn), the first and third butterfly valves are opened and the second butterfly valve is closed, realizing the bidirectional clean circulation of "frequency converter heat generation → heat dissipation air duct → outdoor discharge" and "outdoor fresh air → heat conduction air duct → air-water cold precooling → frequency converter room". In this mode, the heat exchanger precooling of fresh air can offset more than 20% of the heat load, which is significantly energy-saving compared with the traditional pure fresh air mode, and completely isolates the invasion of moisture. When high temperature comes in summer, the first and third butterfly valves are closed and the second butterfly valve is opened, forming a closed internal circulation: frequency converter heat discharge → heat dissipation air duct → heat conduction air duct → air-water cold deep cooling → return to frequency converter room. Compared with the air conditioning refrigeration scheme, this mode recovers waste heat through water cooling with high efficiency, and the energy consumption is reduced by more than 40%, and the risk of system collapse caused by air conditioner compressor failure is avoided.

[0028] The existing technology of louver air inlet is usually directly exposed to the outdoor, and is forced to be closed during heavy rain, resulting in interruption of heat dissipation. The present application adopts double sealing of rainproof louver air inlet and butterfly valve: the inclination angle of the blade is designed to make the rainwater flow out along the inclined surface, and the silicone sealing strip is pressed tightly to form a physical barrier when the valve is closed, ensuring continuous operation in extreme weather. More importantly, the air-water cooling device is hard connected with the heat dissipation system through the heat conduction air duct, so that the heat exchanger can stably handle 40-60℃ medium temperature waste gas (traditional air conditioner needs to handle high temperature wind above 60℃), which significantly improves the cooling efficiency and prolongs the service life of the equipment. This modular integrated design fundamentally solves the technical deadlocks of "waterproof and heat dissipation cannot be achieved simultaneously" and "energy saving and reliability are mutually contradictory" in traditional schemes.

[0029] In another technical solution, the temperature monitoring unit includes an outdoor temperature sensor (61) and an indoor temperature sensor (62); The electric control device is electrically connected with the first butterfly valve (42), the second butterfly valve (52), the third butterfly valve (53), the fan and the temperature monitoring unit; The electric control device is set to: when the outdoor temperature sensor (61) detects a value lower than the indoor temperature sensor (62), open the first and third butterfly valves (42) and (53), and close the second butterfly valve (52); when the outdoor temperature sensor (61) detects a value higher than the indoor temperature sensor (62), close the first and third butterfly valves (42) and (53), and open the second butterfly valve (52).

[0030] The existing frequency converter temperature control system generally uses a single temperature threshold to control the start and stop of the ventilation equipment, for example, the exhaust fan is started when the indoor temperature exceeds the set value. This simple logic has a serious risk of misjudgment: in summer at night, although the indoor temperature may drop to a safe range, the outdoor hot and humid air is still destructive, and at this time, if new air is blindly introduced, it will cause equipment condensation; on the contrary, during the low temperature period in winter, although the outdoor cold air is beneficial to heat dissipation, it may cause the equipment to frost. More troublesome is that the traditional system cannot sense the temperature difference between the inside and outside environment, and often appears contradictory operation such as "mistakenly opening new air to intensify the invasion of hot and humid air at high temperature" or "missing natural cold source at low temperature".

[0031] The present application has environment temperature difference sensing ability through the cooperative monitoring of the outdoor temperature sensor and the indoor temperature sensor. The electric control device compares the data of the two sensors in real time, when the outdoor temperature is lower than the indoor temperature, the first butterfly valve and the third butterfly valve are automatically opened and the second butterfly valve is closed, forming an outdoor new air cooling channel. In this mode, the air-water cooling device first pre-cools the dry cold air and then delivers it to the frequency converter room, which not only prevents the invasion of moisture but also enhances the cooling effect. When the outdoor temperature exceeds the indoor temperature, the system immediately closes the first and third butterfly valves and opens the second butterfly valve, switching to a pure internal circulation mode, and the air-water cooling device focuses on processing the hot air in the closed space. This switching mechanism based on temperature difference criterion avoids the decision-making defects of traditional schemes that "only focus on absolute temperature and ignore environmental humidity and cold source quality".

[0032] Manual or semi-automatic air valve control in the prior art often has a lag, for example, it takes several minutes for the operator to switch modes after discovering temperature abnormalities, and at this time the equipment may have already overheated and alarmed. The electric control device of the present scheme converts the temperature difference signal into a millisecond-level instruction to drive the butterfly valve group to instantaneously reconstruct the air duct. Especially in the case of sudden rain, the outdoor temperature may drop and trigger a false new air mode, but the system can identify the "low temperature and high humidity" dangerous working condition through real-time temperature difference monitoring and maintain internal circulation until the environment returns to stability. This dynamic risk avoidance capability cannot be achieved by a fixed program control system, and the traditional scheme often needs to install an additional humidity sensor to partially alleviate the problem, while the present system only needs to associate the logic of the two temperature sensors to build an environmental safety barrier.

[0033] In another technical solution, the leaf inclination angles of the first rainproof louver air inlet (41) and the second rainproof louver air inlet (51) are both 30°-45°, and a silica gel sealing strip is embedded on the inner side of each air inlet.

[0034] The rainproof louver of the traditional heat dissipation system generally adopts horizontal blades or small-angle inclined design, and its rainproof principle only relies on gravity natural drainage. In the case of strong storm, raindrops are wrapped by airflow and penetrate through the gap between the blades, and flow into the equipment along the air duct. More seriously, the louver and the air duct flange are connected by hard bolts, and the thermal expansion and contraction of metal and vibration can easily cause micro cracks on the joint surface, which becomes a hidden channel for moisture penetration. Some improvement schemes try to add a rain cover outside the louver, which greatly sacrifices the ventilation cross-sectional area, forcing the fan power consumption to soar.

[0035] The present application accurately sets the inclination angle of the louver blade to the optimal range of fluid dynamics. When the raindrops hit the blade surface, they are affected by the double action of the inclination angle and the air shear force, and are thrown away along the preset trajectory. The vortex area formed on the back of the blade generates an air curtain barrier, which actively ejects the invading water droplets. The silicone sealing strip inside the air inlet is the core breakthrough. Its elastic properties are mechanically extruded by the valve plate when the butterfly valve is closed, and it is directionally deformed to fill all micro irregularities of the metal flange. This dynamic sealing mechanism completely overturns the traditional static sealing concept - when the valve plate is opened, the sealing strip rebounds and restores, without hindering the airflow; when the valve plate is closed, it becomes a super-elastic sealing body, which still maintains the rebound force even under long-term pressure.

[0036] The metal louver of the prior art is prone to fatigue deformation in the high-frequency vibration environment of the frequency converter, resulting in expansion of the gap between the blades and forming permanent water leakage points. The special formula of the silicone sealing strip in the present application gives it weather resistance and anti-creep ability, maintaining the stability of the sealing interface in the continuous vibration of the equipment. Extreme temperature tests show that the hardness of the silicone slowly rises at subzero temperatures without brittle fracture, and the softening rate is lower than that of standard rubber at high temperatures, ensuring that the sealing pressure is always higher than the pressure difference between the inside and outside of the air duct. This self-adaptive sealing structure fundamentally eliminates the technical malady of "mechanical wear leading to rainproof failure", enabling the system to safely switch to the ventilation mode in typhoons and heavy rain.

[0037] In another technical solution, the first butterfly valve (42), the second butterfly valve (52) and the third butterfly valve (53) are driven to open and close by a stepping motor, and the opening and closing response time is ≤0.5 seconds.

[0038] The wind valve of the traditional frequency converter heat dissipation system generally uses an ordinary AC motor for driving, and its opening and closing process needs to go through three stages of acceleration, uniform speed and deceleration, and it usually takes more than 2 seconds to complete a 90° rotary motion. In emergency conditions such as sudden rainstorm or temperature change, the valve lag causes a large amount of hot and humid air to flow into the air duct, and by the time the valve is fully closed, a water film has been formed inside the equipment. Some precision control systems try to use servo motors to improve precision, but the complex position feedback mechanism increases the failure rate, and the high cost makes it difficult to be popularized in industrial scenarios.

[0039] The application selects a stepping motor as a butterfly valve driving core, and the tooth groove meshing structure of the electromagnetic rotor and stator can decompose rotation into discrete angle steps. When the electric control device sends a pulse command, the motor shaft can respond instantaneously with constant torque without acceleration process, and the limit stroke from full opening to full closing can be completed in milliseconds. This opening and closing mechanism completely avoids the inertia delay problem of traditional motors, and when the first drop of rain hits the rainproof louver, the third butterfly valve has reached the sealing station in advance. The open-loop control characteristics of the stepping motor bring essential reliability, which can accurately position without encoder feedback, and still maintains zero drift in the strong electromagnetic interference environment of the frequency converter.

[0040] The valve sealing of the prior art relies on a mechanical stopper to force compression, and long-term impact causes the stopper to deform and cause leakage. The micro-step driving technology of the stepping motor creates a revolutionary sealing method: after receiving the closing command, the motor first rotates at high speed to 85° position, and then switches to 200 subdivision micro-steps for slow advancement. Finally, the valve plate is attached to the sealing strip with a gentle pressure of 0.1 newton-meter, which not only eliminates impact loss but also optimizes the silicone deformation. When the system switches to the ventilation mode, the motor reverses the micro-step to release the sealing pressure and opens at high speed, avoiding the tearing of the sealing strip. This hard and soft action logic enables the equipment to run maintenance-free for ten years, while the traditional valve needs to replace more than three limit components per year.

[0041] In another technical solution, the circulating fan (32) is a variable frequency fan, and the rotating speed of the fan increases with the increase of indoor temperature.

[0042] The circulating fan of the existing air-water cooling device mostly uses a power frequency motor to run at constant speed, and the air volume setting only considers the maximum heat load condition of the equipment. During the light load or low temperature period of the frequency converter, continuous full-speed airflow causes multiple problems: excessive cold air causes the surface temperature of the heat exchanger to drop sharply, and the water vapor in the air condenses into water droplets to corrode the fins; strong wind pressure increases pipeline vibration and noise, and accelerates mechanical structure fatigue; more seriously, constant air volume cannot adapt to dynamic heat load, and excessive cooling during the low temperature period induces condensation. Some systems try to adjust the flow through a damper, but the turbulence caused by the valve throttling seriously reduces the heat exchange efficiency.

[0043] The application transforms the circulating fan into a permanent magnet synchronous variable frequency motor driven, and the rotating speed control signal is derived from the continuous feedback of the indoor temperature sensor. When the frequency converter is in the starting or low load state, the electric control device outputs a low frequency command to make the fan maintain the minimum turbulent rotating speed, at which time the airflow gently sweeps over the surface of the heat exchanger, avoiding condensation and reducing mechanical loss. As the device load rises, the fan rotating speed increases in a smooth curve, and the air volume and heat load establish a dynamic balance. This self-adaptive adjustment mechanism makes the heat exchanger always work in the safety zone above the dew point temperature, completely eliminating the low temperature corrosion caused by the "big horse pulling a small cart" of the traditional system.

[0044] Traditional power frequency fan response lag when sudden load, for example, the rolling mill instant speed up to produce a large amount of waste heat, need several minutes to conduct the room temperature to the fan control system. The frequency converter of the scheme is embedded in the feedforward algorithm, the temperature rise trend is predicted by monitoring the power curve of the frequency converter, and the speed is raised in advance before the temperature sensor detects the change. When the load drops, the fan slows down according to the thermal inertia model instead of stopping suddenly, preventing airflow disturbance from disturbing precision electronic components. This predictive control makes the air-water cooling device a synchronous mirror of the heat state of the frequency converter, while the traditional system operates blindly - either the reaction lags and the temperature rises, or the over response causes thermal oscillation.

[0045] In another technical scheme, a 80-100 mesh stainless steel filter screen is arranged in the cooling water inlet.

[0046] Industrial field cooling water generally contains welding slag, scale fragments and pipeline corrosion, and traditional air-water cooling device only installs coarse filter in the main pipeline. Such filter is mostly single layer punched metal plate with aperture larger than millimeter, which cannot intercept small particles. When the cooling water enters the heat exchanger capillary pipeline, the suspended matter gradually deposits to form hard scale, like blood vessel plaque accumulation. A case of a chemical plant shows that the heat exchange efficiency decays by 40% after three months of operation, and needs to be stopped for acid washing to recover. More dangerously, local overheating of scale may cause pipe explosion, and high pressure cooling water splashing to the frequency converter will cause catastrophic accident.

[0047] The application embeds a special stainless steel filter screen in the air-water cooling device inlet, and the precise woven structure forms a micron level physical barrier. The mesh size is optimized by fluid dynamics, which can capture fine iron oxide particles like flour, and avoid excessive water flow resistance. The filter screen and the flange are connected by quick release clamp, which can be replaced by one person in three minutes. The deep protection mechanism lies in the three-dimensional structure design of the net body - after being blocked, the pollutants are guided by vortex to settle at the bottom of the net pocket, and the surface accumulation mode of the non-traditional plane filter screen makes the actual pollutant capacity increase by more than five times.

[0048] The existing coarse filter often tears the screen surface due to excessive pressure difference, and the pollutants backwash into the system during backwashing. The reinforced support framework and elastic woven layer of the filter screen of the scheme form a composite, when the water inlet pressure abnormally rises, the elastic layer locally deforms to expand the mesh to release pressure, and automatically resets to maintain the filtering accuracy after the pressure returns. This self-protection feature completely avoids the dilemma of "blockage" and "breakdown". The metallurgical plant shows that in the circulating cooling water containing a large amount of iron oxide scales, the heat exchanger internal pipeline still maintains the mirror surface state after one year of continuous operation, while the traditional system needs to be disassembled and cleaned every quarter. This source interception technology makes the air-water cooling device transform from a fragile component to a reliable heat exchange core.

[0049] Another technical solution is that the normally open fireproof valve (43) is arranged in the heat dissipation air duct (4); the normally open fireproof valve (43) is electrically connected with the electric control device; when the detection value of the indoor temperature sensor (62) or the outdoor temperature sensor (61) reaches 70 DEG C, the electric control device controls the normally open fireproof valve (43) to close.

[0050] The fireproof design of the conventional frequency converter heat dissipation system usually relies on an independent smoke detector or a fusible alloy fireproof valve, and the response mechanism has a fundamental defect. The smoke detector needs smoke particles to diffuse to the probe to trigger, and the initial fire smoke is difficult to escape in the closed environment in the frequency converter cabinet. The fusible alloy valve needs the flame to directly burn the fuse link to act, and at this time, the fire has spread to the air duct. The accident analysis of a power plant shows that the fireproof valve is started only after six minutes after the cable overheating, and the high-temperature toxic smoke has invaded the adjacent equipment through the air duct. More passive is that the conventional fireproof valve is locked after closing, and it cannot be determined whether the fire is eliminated, and the equipment is often damaged due to false triggering.

[0051] The application embeds a normally open fireproof valve at a key node of the heat dissipation air duct, and the initial state guarantees that the airflow is unobstructed. The fireproof valve is deeply linked with the electric control device, and continuously receives global monitoring data from indoor and outdoor temperature sensors. When the detection value of any sensor exceeds the critical temperature threshold, the electric control device instantly issues a command to drive the fireproof valve actuator to cut off the air duct. This judgment logic based on temperature jump rate has predictability - cable overload or component short circuit often accompanies temperature rise, and the system has physically isolated the dangerous area before the fire occurs. The reset mechanism of the fireproof valve supports remote command unlocking, and the ventilation can be quickly restored after the fire alarm is removed, avoiding the irreversible damage of the conventional fuse valve.

[0052] The existing fireproof valve adopts a pure mechanical structure, and the execution speed depends on the spring energy storage efficiency. The scheme combines electromagnetic drive and mechanical redundancy: when the electric control signal is triggered, the electromagnet releases the lock first, and the valve plate falls under the action of gravity, and the auxiliary spring overcomes the friction resistance to accelerate the closing. The dual power guarantee mechanism makes the action time of the valve several times shorter than that of the conventional valve, which wins the key window for the initial fire extinguishing. More importantly, the system identifies the fire source position by comparing the data difference of the indoor and outdoor temperature sensors: if only the indoor sensor is overheated, it is determined that the frequency converter body is abnormal; if the outdoor sensor is also overheated, it may be caused by external fire. This intelligent criterion avoids the misoperation caused by inter-fire, and the conventional valve treats all high-temperature signals equally.

[0053] Another technical solution is that the frequency converter operating environment temperature regulation system, the electric control device is further arranged to dynamically adjust the temperature difference threshold T used for controlling the switching of the first butterfly valve, the second butterfly valve and the third butterfly valve according to different preset temperature intervals of the detection value of the outdoor temperature sensor, and execute corresponding instructions. When the outdoor temperature sensor detection value ≤ first preset temperature threshold L (L is 5-10℃), set temperature difference threshold T1 (T1 is 0.5-2℃), and: If the outdoor temperature sensor detection value is lower than the indoor temperature sensor detection value, and the difference between the two reaches or exceeds T1, open the first and third butterfly valves and close the second butterfly valve; If the outdoor temperature sensor detection value is higher than the indoor temperature sensor detection value, or the difference between the two is less than T1, close the first and third butterfly valves and open the second butterfly valve; When the outdoor temperature sensor detection value > first preset temperature threshold L and ≤ second preset temperature threshold H (H is 25-30℃), set temperature difference threshold T2 (T2 is 2-4℃), and: If the outdoor temperature sensor detection value is lower than the indoor temperature sensor detection value, and the difference between the two reaches or exceeds T2, open the first and third butterfly valves and close the second butterfly valve; If the outdoor temperature sensor detection value is higher than the indoor temperature sensor detection value, or the difference between the two is less than T2, close the first and third butterfly valves and open the second butterfly valve; When the outdoor temperature sensor detection value > second preset temperature threshold H, set temperature difference threshold T3 (T3 is 4-6℃), and: If the outdoor temperature sensor detection value is lower than the indoor temperature sensor detection value, and the difference between the two reaches or exceeds T3, open the first and third butterfly valves and close the second butterfly valve; If the outdoor temperature sensor detection value is higher than the indoor temperature sensor detection value, or the difference between the two is less than T3, close the first and third butterfly valves and open the second butterfly valve; Wherein, the temperature difference threshold satisfies: T1 < T2 < T3.

[0054] The conventional frequency converter temperature control system adopts fixed temperature difference threshold to switch cooling mode, for example, the new air mode is started when the outdoor temperature is 2℃ lower than the indoor temperature all year round. This rigid control logic causes serious misjudgment in complex natural environment: in the early morning of the winter, the outdoor temperature may drop to minus, although it is 3℃ lower than the indoor temperature, which meets the new air opening condition, but the bone-chilling cold wind directly poured into the equipment will cause the electronic components to frost damage; before the thunderstorm in the hot summer, the outdoor temperature is temporarily lower than the indoor temperature by 1.5℃, which does not reach the fixed threshold and continues to circulate, missing the valuable opportunity to take advantage of the short cool period to reduce temperature. More difficult is that the fixed threshold cannot adapt to seasonal characteristics - a larger temperature difference is needed in winter to prevent overcooling, and a smaller temperature difference is needed in summer to capture the cooling window.

[0055] The application initiates a temperature difference threshold dynamic following mechanism, so that the system control strategy intelligently evolves with the ambient temperature. When the outdoor temperature drops to the critical zone of freezing point (5-10℃), the system automatically enables the minimum temperature difference threshold T1 (0.5-2℃). This setting is like wearing a “temperature magnifying glass” for the device: the outdoor temperature slightly rises and the fresh air mode is started, but the fresh air is preheated by the air-water cooling device to avoid the cold current directly hitting the electronic components. In the comfortable zone of spring and autumn (10-25℃), the medium threshold T2 (2-4℃) is switched to, which can prevent the mode from oscillating due to the slight wind disturbance and can also respond to the diurnal temperature difference. In the high temperature zone of summer (>25℃), the maximum threshold T3 (4-6℃) is enabled, and fresh air is introduced only when there is a significant low temperature advantage outside, which greatly reduces the probability of invasion of hot and humid air. This three-stage adaptive logic essentially encodes the annual climate map into control parameters.

[0056] The prior art often encounters a dilemma when encountering extreme weather: increasing the threshold value avoids mis-switching, but sacrifices energy-saving opportunities; reducing the threshold value captures the cold source, but increases the risk of the device. The present scheme breaks this paradox through the positive correlation design of the threshold value and the outdoor temperature: a small threshold value is used in the low temperature season, because dry cold air is harmless and the air-water cooling device can heat; a large threshold value is used in the high temperature season, because the harm of hot and humid air is doubled. The actual measurement of a coastal wind farm shows that the outdoor temperature frequently fluctuates at 28℃ in the typhoon season, and the traditional system switches the mode 17 times within 24 hours, while the present scheme only switches 3 times and all in the stable weather period. This intelligent regulation based on environmental risk assessment establishes a precise balance between capturing natural cold sources and ensuring device safety.

[0057] The present technical solution gives the system “climate awareness”. When the cold wave comes, it is cautious like an experienced operator and does not easily introduce outdoor air unless it is confirmed to be warm enough; when the heat wave subsides, it instantly captures the coolness brought by the breeze like a sharp hunter. This dynamic intelligence makes the variable frequency cooler control from mechanical execution to environmental integration, while the traditional system always swings between “overly conservative” and “blindly aggressive”.

[0058] The number of devices and the scale of processing described herein are used to simplify the description of the application. Applications, modifications and variations of the application are obvious to those skilled in the art.

[0059] Although the embodiments of the present application have been disclosed as above, they are not limited to the applications and embodiments listed in the specification, and can be fully applied to various fields suitable for the present application, and additional modifications can be easily realized by those skilled in the art, therefore the present application is not limited to specific details and the figures shown and described herein, without departing from the general concept defined by the claims and the equivalent scope.

Claims

1. A frequency converter operating environment temperature control system, characterized in that: include: A frequency converter, which is arranged in a frequency converter room; A heat dissipation fan is provided on the frequency converter, and a first air inlet of the heat dissipation fan is connected to the upstream of the air flow of the heating element; An air-water cooling device includes a housing, a heat exchanger built into the housing, a circulating fan built into the housing, and a cooling water inlet and a cooling water outlet provided on the housing; wherein the housing is provided with a second air inlet and a second air outlet; the cooling water inlet is connected to the water inlet end of the heat exchanger, and the cooling water outlet is connected to the water outlet end of the heat exchanger; the circulating fan is provided in the housing for driving air to flow through the heat exchanger; the circulating fan is located on one side of the second air inlet; the air outlet of the heat exchanger is connected to the inverter room through the second air outlet; A heat dissipation duct, one end of which is connected to the second exhaust port of the heat dissipation fan and the other end of which extends to the outside of the inverter room; a heat-conducting air duct, one end of which is connected to one side of the heat-dissipating air duct, and the other end of which is connected to the second air inlet; A first rainproof louver air vent, which is provided at the other end of the heat dissipation air duct; A second rainproof louver air vent is provided on one side of the heat conducting air duct; a first butterfly valve connecting the first rainproof louver air outlet and the interior of the heat dissipation air duct; The second butterfly valve is located at one end of the heat transfer air duct to control the connection between the heat transfer air duct and the heat dissipation air duct; a third butterfly valve connecting the second rainproof louver air outlet and the second air inlet; a temperature monitoring unit comprising an outdoor temperature sensor and an indoor temperature sensor; an electric control device electrically connected to the first butterfly valve, the second butterfly valve, the third butterfly valve, the fan and the temperature monitoring unit; Among them, the electronic control device is set to: when the detection value of the outdoor temperature sensor is lower than the detection value of the indoor temperature sensor, the first butterfly valve and the third butterfly valve are opened, and the second butterfly valve is closed; when the detection value of the outdoor temperature sensor is higher than the detection value of the indoor temperature sensor, the first butterfly valve and the third butterfly valve are closed, and the second butterfly valve is opened.

2. The inverter operating environment temperature control system according to claim 1, characterized in that: The blade inclination angles of the first rainproof louver air vent and the second rainproof louver air vent are both 30°-45°, and silicone sealing strips are embedded on the inner sides of the air vents.

3. The inverter operating environment temperature control system according to claim 1, characterized in that: The first butterfly valve, the second butterfly valve and the third butterfly valve are all driven to open and close by a stepper motor, and the opening and closing response time is ≤0.5 seconds.

4. The inverter operating environment temperature control system according to claim 1, characterized in that: The circulation fan is a variable frequency fan, and its speed increases as the indoor temperature rises.

5. The inverter operating environment temperature control system according to claim 4, characterized in that: The cooling water inlet is equipped with an 80-100 mesh stainless steel filter.

6. The inverter operating environment temperature control system according to claim 1, characterized in that: Also includes: A normally open fire damper is installed in the heat dissipation duct; the normally open fire damper is electrically connected to the electronic control device. When the detection value of the indoor temperature sensor or the outdoor temperature sensor reaches 70°C, the electronic control device controls the normally open fire damper to close.

7. The inverter operating environment temperature control system according to claim 1, characterized in that: The electronic control device is further configured to dynamically adjust the temperature difference threshold T used to control the switching of the first butterfly valve, the second butterfly valve, and the third butterfly valve according to the different preset temperature ranges of the detection value of the outdoor temperature sensor, and execute the corresponding instructions: When the outdoor temperature sensor detection value is less than or equal to the first preset temperature threshold L, the temperature difference threshold T1 is set, and: If the outdoor temperature sensor detection value is lower than the indoor temperature sensor detection value, and the difference between the two reaches or exceeds T1, the first and third butterfly valves are opened, and the second butterfly valve is closed; If the outdoor temperature sensor detection value is higher than the indoor temperature sensor detection value, or the difference between the two is less than T1, the first butterfly valve and the third butterfly valve are closed, and the second butterfly valve is opened; When the outdoor temperature sensor detection value is greater than the first preset temperature threshold L and less than or equal to the second preset temperature threshold H, the temperature difference threshold T2 is set, and: If the outdoor temperature sensor detection value is lower than the indoor temperature sensor detection value, and the difference between the two reaches or exceeds T2, the first butterfly valve and the third butterfly valve are opened, and the second butterfly valve is closed; If the outdoor temperature sensor detection value is higher than the indoor temperature sensor detection value, or the difference between the two is less than T2, the first butterfly valve and the third butterfly valve are closed, and the second butterfly valve is opened; When the outdoor temperature sensor detection value is greater than the second preset temperature threshold H, the temperature difference threshold T3 is set, and: If the outdoor temperature sensor detection value is lower than the indoor temperature sensor detection value, and the difference between the two reaches or exceeds T3, the first and third butterfly valves are opened, and the second butterfly valve is closed; If the outdoor temperature sensor detection value is higher than the indoor temperature sensor detection value, or the difference between the two is less than T3, the first butterfly valve and the third butterfly valve are closed, and the second butterfly valve is opened; The temperature difference threshold satisfies: T1 < T2 < T3.

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