Frequency converter device and frequency converter device control method

Abstract

The application relates to a frequency converter device and a frequency converter device control method, and specifically comprises a cabinet body, a frequency converter, a gas pressure adjusting device, a humidity adjusting device and a drying treatment device. The cabinet body has a closed containing space, and the frequency converter is assembled in the containing space. The gas pressure adjusting device is communicated with the containing space and is used for conveying pressurized gas into the containing space, so that the pressure in the containing space is stabilized to a set pressure. Thus, constant pressure control of the inside of the cabinet body is realized. The temperature adjusting device is arranged in the containing space and is used for adjusting the temperature in the containing space to be stabilized to a set temperature, so that constant temperature control of the inside of the cabinet body is realized. The drying treatment device is arranged between the gas pressure adjusting device and the cabinet body and is used for drying the conveyed pressurized gas to a set humidity. Thus, constant humidity control of the inside of the cabinet body is realized. In this way, stable constant temperature, constant pressure and humidity control of the containing space in the frequency converter device are realized, and the condensation phenomenon of the frequency converter device is effectively avoided.

Description

Technical Field

[0001] This application relates to the field of frequency converter equipment technology, and in particular to a frequency converter equipment and a frequency converter equipment control method. Background Technology

[0002] Variable frequency drives (VFDs) are primarily used to regulate the operating frequency of equipment, reduce energy consumption, ensure smooth equipment startup, and minimize damage to motors from the high current generated during direct startup. They are widely applicable to automatic control in various applications, including water supply, drainage, fire protection, sprinkler system pressurization, and HVAC hot and cold water circulation in buildings.

[0003] Variable frequency drive (VFD) equipment operates in diverse environments in typical engineering projects, with significant variations in internal temperature, humidity, and gas pressure. These variations, along with changes in altitude and other environmental factors, cause oxidation and other chemical reactions in electrical components, structural parts, and other components, leading to condensation and accelerated aging. To avoid these problems, most VFD equipment employs a completely sealed design, regulating internal temperature and humidity by exchanging outside air with the internal air.

[0004] However, this adjustment method is greatly affected by the environment, and the influence of air in the environment is uncontrollable, so it still cannot effectively avoid condensation in the frequency converter equipment. Summary of the Invention

[0005] Based on this, this application addresses the serious condensation problem in existing frequency converter equipment by proposing a frequency converter device and a frequency converter device control method. This frequency converter device and frequency converter device control method have good constant pressure, constant temperature and constant humidity control effects, and can effectively avoid condensation in frequency converter equipment.

[0006] A frequency converter device, comprising:

[0007] The cabinet has a closed storage space;

[0008] The frequency converter is installed within the accommodating space;

[0009] A pressure regulating device is connected to the accommodating space, and the pressure regulating device is used to deliver pressurized gas into the accommodating space until the pressure in the accommodating space is stabilized to a set pressure;

[0010] A temperature regulating device is provided within the accommodating space to regulate the temperature within the accommodating space to a set temperature.

[0011] A drying device is located between the air pressure regulating device and the cabinet. The drying device is used to dry the pressurized gas to a set humidity.

[0012] In one embodiment, the air pressure regulating device includes a gas supply unit and a gas recovery unit that are both in communication with the accommodating space, and the drying treatment device is disposed between the gas supply unit and the cabinet or between the gas recovery unit and the gas supply unit;

[0013] When the pressure in the accommodating space is lower than the set pressure, the gas supply unit delivers pressurized gas into the accommodating space to squeeze the original gas in the accommodating space into the gas recovery unit.

[0014] In one embodiment, the temperature regulating device includes a semiconductor cooling chip and a temperature monitoring system;

[0015] When the temperature monitoring system detects that the temperature in the accommodating space is higher than the set temperature, it controls the semiconductor cooling chip to cool.

[0016] When the temperature monitoring system detects that the temperature in the accommodating space is lower than the set temperature, it controls the semiconductor cooling chip to heat up.

[0017] In one embodiment, the inverter device further includes a humidity monitoring system;

[0018] When the humidity monitoring system detects that the humidity in the containment space is higher than the set humidity, it controls the air pressure regulating device to continuously deliver pressurized gas at the set humidity into the containment space or simultaneously controls the semiconductor cooling chip to heat up until the humidity in the containment space reaches the set humidity.

[0019] In one embodiment, the frequency converter device further includes a pressure monitoring system;

[0020] When the humidity monitoring system detects that the pressure in the containment space is lower than the set pressure, it controls the air pressure regulating device to continuously supply pressurized gas into the containment space until the pressure in the containment space stabilizes to the set pressure.

[0021] In one embodiment, the frequency converter device further includes a dust removal device disposed within the accommodating space;

[0022] The dust removal device is used to remove dust adsorbed on the cabinet.

[0023] In one embodiment, the dust removal device is an ultrasonic vibration device.

[0024] According to another aspect of this application, a method for controlling a frequency converter device is provided, comprising the following steps:

[0025] The control drying device dries the pressurized gas flowing through it to a set humidity level;

[0026] The control air pressure regulating device delivers the pressurized gas into the sealed enclosure space inside the inverter equipment cabinet until the pressure in the enclosure space stabilizes at the set pressure.

[0027] The temperature regulating device within the accommodating space adjusts the air temperature within the accommodating space to a set temperature.

[0028] In one embodiment, the step of the control air pressure regulating device supplying pressurized gas to a sealed accommodating space inside the inverter equipment cabinet until the pressure in the accommodating space stabilizes to a set pressure specifically includes:

[0029] The gas supply unit controls the delivery of pressurized gas into the accommodating space to compress the existing gas in the accommodating space into the gas recovery unit;

[0030] Detect whether the pressure within the accommodating space has reached the set pressure; if so, control the gas supply to stop.

[0031] In one embodiment, the step of controlling the temperature regulating device within the accommodating space to adjust the air temperature within the accommodating space to a set temperature specifically includes:

[0032] Detect whether the temperature inside the accommodating space is higher than the set temperature;

[0033] If so, the temperature regulating device includes a semiconductor cooling chip for cooling;

[0034] If not, the temperature regulating device includes a semiconductor cooling chip for heating.

[0035] In one embodiment, the following steps are also included:

[0036] Detect whether the humidity inside the accommodating space is higher than the set humidity;

[0037] If so, control the air pressure regulating device to continuously supply pressurized gas at the set humidity to the accommodating space, or simultaneously control the semiconductor cooling chip to heat, until the humidity in the accommodating space reaches the set humidity.

[0038] In one embodiment, the following steps are also included:

[0039] Detect whether the pressure inside the container is lower than the set pressure;

[0040] If so, the pressure regulating device continuously supplies pressurized gas at the set humidity to the accommodating space until the pressure in the accommodating space stabilizes at the set pressure.

[0041] The aforementioned frequency converter equipment includes a cabinet, a frequency converter, a pressure regulating device, a temperature regulating device, and a drying device. The cabinet has a sealed enclosure within which the frequency converter is installed. The pressure regulating device, connected to the enclosure, supplies pressurized gas to the enclosure until the pressure is stabilized at a set level, thus achieving constant pressure control within the cabinet. The temperature regulating device, located within the enclosure, regulates the temperature to a set level, thereby achieving constant temperature control within the cabinet. The drying device, located between the pressure regulating device and the cabinet, dries the supplied pressurized gas to a set humidity level, thus achieving constant humidity control within the cabinet. This system ensures stable temperature, pressure, and humidity control within the frequency converter equipment's internal enclosure, effectively preventing condensation. Furthermore, because the pressurized gas causes the pressure inside the containment space to be higher than atmospheric pressure, it increases the internal electrical insulation capacity of the frequency converter and improves the internal insulation strength of the frequency converter. During the design, the gaps between various electrical components can be reduced, so that the size of the frequency converter can remain unchanged or become smaller when the power of the frequency converter increases. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the inverter device structure provided in an embodiment of this application;

[0043] Figure 2 for Figure 1 A partial structural diagram of the frequency converter equipment provided in the document;

[0044] Figure 3 for Figure 1 A partial structural diagram of the frequency converter equipment provided in the diagram;

[0045] Figure 4 for Figure 1 A schematic diagram of the control principle of the semiconductor cooling chip in the frequency converter equipment provided in the document;

[0046] Figure 5 for Figure 1 The diagram showing the workflow of the frequency converter equipment provided in the document;

[0047] Figure 6 A flowchart illustrating a frequency converter device control method according to another embodiment of this application is provided.

[0048] Figure 7 for Figure 6 A flowchart illustrating a second specific embodiment of the inverter equipment control method provided in the document;

[0049] Figure 8 for Figure 6 A flowchart illustrating a third specific embodiment of the inverter equipment control method provided in the document;

[0050] Figure 9 for Figure 6 A flowchart illustrating the fourth specific embodiment of the inverter equipment control method provided in the document;

[0051] Figure 10 for Figure 6 A flowchart illustrating the fifth specific embodiment of the frequency converter equipment control method provided in the document.

[0052] Reference numerals: 100, Inverter equipment; 10, Cabinet; 20, Storage space; 30, Temperature control device; 40, Dust removal device; 50, Track; Control1, Compressor; VFDIval, Inlet valve; VFDOval, Outlet valve; C1, Compressor; Cl1, First inlet of compressor; CO2, Compressor outlet; Cl2, Second inlet of compressor; R1, First gas storage device; R2, Second gas storage device; Tval1, First three-way valve; AIval1, Gas release control valve; Tval2, Second three-way valve; AR1, Gas recovery device; Tval2, Interface control valve; AIval2, Gas recovery control valve; NIval1, Gas source control valve; 60, Drying treatment device. Detailed Implementation

[0053] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0054] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0056] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0057] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0058] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0059] As described in the background section, frequency converters operate in diverse environments during typical engineering projects. Internal temperatures and humidity levels fluctuate significantly, and gas pressure changes with altitude and other application conditions. This leads to oxidation and other chemical reactions in electrical components and structural parts due to temperature and humidity variations, accelerating aging. Furthermore, condensation is a major cause of short circuits within the frequency converter. Changes in internal air pressure, coupled with excessive humidity, indirectly reduce electrical safety clearances. The relatively smaller insulation gaps frequently result in voltage breakdown and corona discharge. Therefore, when designing frequency converters for general applications, large insulation gaps are required to ensure sufficient insulation in environments with high humidity and low air pressure at high altitudes. However, this design results in an excessively large overall size for the frequency converter.

[0060] Specifically, condensation, also known as dew, literally means condensed dewdrops. It is a phenomenon where water vapor in the air reaches saturation and condenses on a relatively cool surface. For inverter equipment, condensation refers to the phenomenon where water droplets form on the inner wall surface when the temperature drops below the dew point temperature. This phenomenon is called condensation. The conditions for condensation to occur depend on: humidity, temperature, and dew point temperature. Humidity is divided into absolute humidity and relative humidity. Absolute humidity refers to the mass of water vapor contained in one cubic meter of air. Relative humidity refers to the degree to which water vapor in the air reaches saturation. Dew point temperature refers to the maximum amount of water vapor present in air at a given temperature, called saturated air. When the temperature of saturated air decreases, the water vapor in the air will condense into water droplets. The saturation temperature of air containing water vapor is called the dew point temperature. Condensation occurs when the absolute humidity reaches the saturation point of the air and the air temperature is below the dew point temperature (such as when the air comes into contact with the cabinet of a frequency converter device whose temperature is below the dew point temperature).

[0061] To circumvent the above problems, some variable frequency controller condensation control methods have emerged on the market, as follows:

[0062] 1) The main idea of ​​the first solution is to install ventilation openings and heaters, etc. Generally, the ventilation openings are equipped with filters, which not only prevents a large amount of dust from entering the inverter equipment, but also ensures the IP protection level.

[0063] The key point of this scheme is to initiate heating inside the frequency converter as soon as the humidity becomes too high, and increase ventilation as the temperature rises. When the humidity exceeds a preset value, heating is triggered to raise the internal temperature of the frequency converter, thereby effectively controlling the relative humidity. After the temperature reaches a preset threshold, ventilation is activated, allowing a certain amount of fresh air from outside to enter the frequency converter, ensuring that the relative humidity and temperature inside and outside the frequency converter remain consistent and within a normal range. Generally, the ventilation system is activated when the temperature exceeds 40°C, and the heater is activated when the relative humidity exceeds 80%.

[0064] 2) The main idea of ​​the second approach is that the internal cooling capacity of the frequency converter is relatively controllable, ensuring that the temperature inside the frequency converter cabinet remains within a certain range. When the humidity exceeds a threshold, the heat dissipation capacity of the frequency converter is reduced, and the power consumption generated by the frequency converter is used to increase the temperature inside the frequency converter cabinet, thereby preventing condensation. When the temperature exceeds a threshold, the heat dissipation capacity is increased to prevent excessively high temperatures from affecting the normal operation of the frequency converter.

[0065] 3) The main idea of ​​the third approach is to effectively reduce the relative humidity of the air by decreasing the water vapor content, thereby eliminating condensation. This mainly includes the following three methods: temperature difference dehumidification, adsorption and membrane dehumidification, and condensation dehumidification.

[0066] Temperature difference dehumidification method: Install a heat sink that is conducive to condensation inside the frequency converter equipment, so that condensation only forms on the heat sink and does not form in other parts of the frequency converter equipment. The condensate formed on the heat sink is discharged out through the outlet to ensure that the frequency converter equipment cabinet always maintains a relatively dry environment.

[0067] Adsorption and membrane dehumidification methods: Appropriate adsorption materials are installed inside the frequency converter to adsorb moisture, ensuring a relatively dry environment inside the cabinet. Alternatively, membrane filters can be used to block moisture, allowing only dry air to pass through, thus ensuring that only relatively dry air flows into the frequency converter.

[0068] Condensation dehumidification method: Set the lowest temperature point inside the frequency converter equipment so that condensation only occurs at that point, thereby effectively reducing the relative humidity inside the frequency converter equipment and keeping the inside of the frequency converter equipment in a relatively dry environment at all times.

[0069] However, the humidity inside the inverter equipment cannot be improved when the external fresh air humidity is high. Furthermore, when external fresh air is introduced into the inverter equipment, the inside of the inverter equipment will soon be filled with high humidity air, so the effect is not ideal.

[0070] To address the aforementioned problems, one embodiment of this application provides a frequency converter device 100, such as... Figures 1 to 4 The system includes a cabinet 10, a frequency converter, a pressure regulating device, a temperature regulating device 30, and a drying device 60. The cabinet 10 has a sealed accommodating space 20, within which the frequency converter is installed. The pressure regulating device, connected to the accommodating space 20, supplies pressurized gas to the accommodating space 20 until the pressure is stabilized to a set pressure, thus achieving constant pressure control within the cabinet 10. The temperature regulating device 30, located within the accommodating space 20, regulates the temperature within the accommodating space 20 to a set temperature, thereby achieving constant temperature control within the cabinet 10. The drying device 60, located between the pressure regulating device and the cabinet 10, dries the supplied pressurized gas to a set humidity level, thus achieving constant humidity control within the cabinet 10. This system achieves stable constant temperature, pressure, and humidity control within the accommodating space 20 of the frequency converter equipment 100, effectively preventing condensation within the frequency converter equipment 100.

[0071] Furthermore, since the pressurized gas causes the pressure inside the containment space 20 to be higher than the atmospheric pressure, the internal electrical insulation capacity of the inverter equipment 100 is increased, and the internal insulation strength of the inverter equipment 100 is improved. During the design, the gaps between various electrical components can be reduced, so that the volume of the inverter equipment 100 can remain unchanged or become smaller when the power of the inverter equipment 100 is increased.

[0072] Understandably, the set pressure, set temperature, and set humidity can all be set values, which are determined based on the climate of the region where the inverter equipment 100 is located. Alternatively, they can all be set threshold ranges, thereby effectively ensuring constant temperature, constant pressure, and constant humidity control of the internal space 20 of the cabinet 10.

[0073] In one embodiment, the cabinet 10 is made of metal, with internal joints welded together. Assembly cracks are sealed with rubber sealing strips and further reinforced with adhesive to ensure the airtightness of the internal storage space 20 of the cabinet 10. This also improves the IP protection rating and enhances dust and water resistance.

[0074] In one embodiment, the pressure regulating device includes a gas supply unit and a gas recovery unit, both connected to the accommodating space 20. When the pressure inside the accommodating space 20 is lower than a set pressure, the gas supply unit delivers pressurized gas into the accommodating space 20 to compress the existing gas inside the accommodating space 20 into the gas recovery unit. This establishes a closed gas self-circulation system to maintain constant pressure control in the accommodating space 20, ensuring that the internal gas pressure of the frequency converter device 100 remains constant and is not affected by external environmental factors that could cause a pressure drop.

[0075] Specifically, before the inverter device 100 is powered on, condensation easily occurs when the air, saturated with relative humidity, encounters metal solids with a relatively low temperature. Excessive condensation can lead to short circuits and overvoltages when the inverter device 100 is powered on. This application removes humidity before the inverter device 100 is operated, improving operational safety. Pressurized gas is supplied to the containment space 20 via a gas supply component to expel any non-compliant gas from the containment space 20 into the gas recovery component. After the inverter device 100 has been running for a period of time, if the pressure in the containment space 20 drops below the set pressure due to certain factors, pressurized gas can still be supplied to the containment space 20 via the gas supply component to replace any non-compliant gas.

[0076] In some embodiments, outdoor air can be directly processed and then delivered into the containment space 20. In other embodiments, pure nitrogen, a gas with excellent insulating properties, can be used as a substitute for high-humidity air. This results in the gas being free of moisture; nitrogen has a boiling point of -196.56°C and a liquefaction temperature far below ambient temperature, therefore, it cannot condense on low-temperature radiators, ensuring the safety and reliability of the inverter equipment 100 before and after operation.

[0077] Specifically, for example, with pure nitrogen gas, at one standard atmosphere and a room temperature of 20°C, the breakdown field strength of air is 35.5 kV / cm, while that of nitrogen is 38.0 kV / cm. Filling the housing space 20 of the frequency converter device 100 with nitrogen increases the internal electrical insulation capacity of the cabinet 10, allowing for a reduction in the size of the cabinet 10. Under the premise that the internal pressure is slightly higher than the external ambient pressure, the gas pressure can effectively seal the cabinet 10. This application aims to increase the internal insulation strength of the frequency converter device 100 by increasing the nitrogen gas pressure, thereby reducing the gaps between various electrical components during the design phase, and thus ensuring that the volume of the frequency converter device 100 remains unchanged or decreases when the power of the frequency converter device 100 increases.

[0078] Besides nitrogen, helium, carbon dioxide, carbon tetrafluoride, sulfur hexafluoride, and other gases can be selected. These gases have a purity of over 99%, excellent insulation properties, are non-toxic and harmless, do not easily produce chemical reactions, have good stability, and are easy to prepare. When using these gases, the gas pressure can be appropriately increased based on the insulation strength relationship between the gas and air to improve the insulation strength of the inverter equipment 100 within its cabinet 10. Especially when using inert gases such as sulfur hexafluoride, the internal insulation strength of the inverter equipment 100 cabinet 10 can be significantly improved at the same gas pressure. This allows for the design of miniaturized inverter equipment 100 for special applications.

[0079] In one embodiment, the drying device 60 can be located between the gas supply unit and the cabinet 10, or between the gas recovery unit and the gas supply unit. When located between the gas supply unit and the cabinet 10, the pressurized gas supplied by the gas supply unit is processed to a set humidity by the drying device 60 before entering the cabinet 10. When located between the gas recovery unit and the gas supply unit, the recovered gas is processed to a set humidity by the drying device 60 before entering the gas supply unit, where it is pressurized and can be recycled, thus forming a closed gas circulation system.

[0080] On the other hand, this application can also dry high-humidity air using the drying device 60, saving the amount of pure gas used. This is suitable for operating conditions with low humidity and normal air pressure, where the operating environment requirements are not harsh. When the operating conditions are more demanding, pure media such as nitrogen can be used instead of air to solve the condensation problem caused by high humidity and temperature changes inside the inverter equipment 100. In environments with large temperature differences, the ambient temperature of the enclosure space 20 can be adjusted using the temperature regulating device 30 to achieve temperature control and dehumidification. When operating in environments with large altitude differences, pure gas can be filled into the enclosed enclosure space 20 to keep the air pressure in the enclosure space 20 of the inverter equipment 100 constant, ensuring insulation capability. This eliminates the influence of external air pressure conditions on the air pressure inside the cabinet 10 of the inverter equipment 100, ensuring appropriate miniaturization of the inverter equipment 100 and reducing redundant design. When the inverter equipment 100 is in special operating conditions such as unstable grid voltage or the need for voltage increase, in order to ensure gas insulation capability and avoid overvoltage breakdown, the gas pressure in the containment space 20 can be increased by increasing the pressure of pressurized gas, thereby improving the insulation capability.

[0081] In one embodiment, the temperature regulating device 30 includes a thermoelectric cooler and a temperature monitoring system; when the temperature monitoring system detects that the temperature inside the accommodating space 20 is higher than a set temperature, it controls the thermoelectric cooler to cool. When the temperature inside the accommodating space 20 is lower than the set temperature, it controls the thermoelectric cooler to heat, thereby regulating the temperature of the accommodating space 20 inside the cabinet 10 to maintain a constant temperature.

[0082] Specifically, when the temperature monitoring system detects that the internal temperature of the cabinet 10 is too low, the semiconductor heating function is activated to increase the internal temperature of the cabinet 10. When the internal temperature of the cabinet 10 is too high, the semiconductor cooling function is activated to reduce the internal temperature of the cabinet 10, thereby maintaining a constant temperature in the internal space 20 of the inverter equipment 100 cabinet 10.

[0083] Using a semiconductor cooling chip, it has a faster response speed and occupies a smaller size compared to other devices, and can quickly regulate the temperature within the 20-inch enclosure.

[0084] Specifically, see Figure 4 This is a schematic diagram of a thermoelectric cooler temperature control system. The thermoelectric cooler is fixed to a copper plate assembly. Due to its insulating properties, electrical insulation is not a concern. When condensation occurs on the copper plate assembly and connected devices, the thermoelectric cooler generates heat, with the hot side in contact with the copper plate assembly and the ambient surface serving as the cooling side, releasing cooling energy into the space. When the copper plate assembly operates at high power, its heat loss is significant, requiring auxiliary cooling to improve its utilization. In this case, the cold side of the thermoelectric cooler is in contact with the copper plate assembly, while the heat from the heating side dissipates heat to the environment within the inverter equipment 100. The heat dissipation from the thermoelectric cooler on the copper plate assembly to the environment can be controlled and offset by the semiconductor array on the housing. The copper plate assembly is a good conductor, with low resistance and low loss during normal operation. During semiconductor heating, the copper plate assembly effectively heats the condensation on and connected to the copper plate, evaporating it into water vapor. Simultaneously, the cooling effect of the cooling surface keeps the ambient temperature around the semiconductor on the copper plate assembly low.

[0085] A semiconductor series-parallel array module is also provided, placed at the four corners of one side panel of the cabinet 10 of the inverter equipment 100. When the cabinet 10 is made of metal, it can serve as a heat dissipation path for the semiconductors. When the ambient temperature inside the inverter equipment 100 needs to be heated, the controller controls the drive circuit to adjust the inner surface of the semiconductor array to the heating function, controlling the power of the drive power supply to increase the ambient temperature. When the ambient temperature inside the cabinet needs to be cooled, the semiconductor array drive power supply switches direction, adjusting the cooling direction of the semiconductor array to dissipate heat into the space, reducing the ambient temperature inside the inverter equipment 100, and adjusting the cooling capacity by controlling the output power of the drive circuit.

[0086] In one embodiment, the inverter device 100 further includes a humidity monitoring system. When the humidity monitoring system detects that the humidity in the accommodating space 20 is higher than the set humidity, it controls the air pressure regulating device to continuously supply pressurized gas at the set humidity into the accommodating space 20 or simultaneously controls the semiconductor cooling chip to heat up until the humidity in the accommodating space 20 reaches the set humidity.

[0087] Specifically, to prevent moisture from accidentally seeping in during long-term operation, a humidity monitoring system monitors the humidity of the containment space 20. When the relative humidity inside the containment space 20 is high, the high-humidity gas inside can be discharged by displacement, and pressurized gas that meets the requirements at the set humidity level can be introduced to regulate the humidity.

[0088] Furthermore, when the relative humidity in the containment space 20 is high enough to cause condensation on the device, the semiconductor cooling chip heating function is activated simultaneously to raise the temperature in the containment space 20, evaporate the condensation, and turn it into steam. The gas in the containment space 20 is replaced by a pressure regulating device, and the steam is carried away until the set requirements are met. Then the semiconductor cooling chip is turned off, thereby ensuring that the temperature, humidity, and air pressure in the inverter equipment 100 are constant.

[0089] In one embodiment, the inverter device 100 also includes a pressure monitoring system. When the pressure monitoring system detects that the pressure in the accommodating space 20 is lower than the set pressure, it controls the pressure regulating device to continuously supply pressurized gas into the accommodating space 20 until the pressure in the accommodating space 20 stabilizes to the set pressure.

[0090] In one embodiment, see [reference] Figures 2-3 After the inverter equipment 100 has been running for a long time, dust will accumulate and form solid dust on the bottom of the cabinet 10. The inverter equipment 100 also includes a dust removal device 40, which is located within the accommodating space 20. The dust removal device 40 is used to remove the dust adsorbed on the cabinet 10.

[0091] Specifically, the dust removal device 40 is an ultrasonic vibration device that combines semiconductor cooling heating with ultrasonic vibration dust removal function to activate and break up hardened dust clumps. At the same time, a pressure regulating device is used to recover impurity gases to ensure the cleanliness of the interior of the containment space 20.

[0092] Further, see Figure 3 The cabinet 10 is equipped with a track 50, and the ultrasonic vibration device and semiconductor cooling chip can run automatically along the track 50 to achieve a 100-degree dust removal effect on the inverter equipment.

[0093] In one embodiment, the cabinet 10 is equipped with a powerful circulating fan that cleans up accumulated dust from time to time, and uses an air pressure regulating device to recover impurity gas for circulation and renewal, so as to avoid dust from accumulating for a long time and forming dust solids.

[0094] Specifically, to prevent dust accumulation and moisture buildup in the inverter equipment 100 during long-term operation, which could then adhere to the internal components or bottom of the cabinet 10, a powerful circulating fan is specially designed to periodically clean up accumulated dust and circulate and refresh the air containing impurities within the space through an air pressure regulating device.

[0095] The powerful circulating fan is controlled by a controller. Based on a pre-set schedule, when the gas in the containment space 20 needs to be replaced, or when specific sticky dust needs to be removed, the powerful fan can rotate 180 degrees in a hemispherical shape to powerfully remove dust from the internal components, copper busbars, and cabinet 10 of the inverter equipment 100, ensuring that dust adhering to solid components for extended periods is cleaned on time. After dust removal, the dust-laden gas is recycled for replacement, thus completing the dust removal process.

[0096] Furthermore, after the dust condenses into a solid, removing the solid impurities requires first controlling the heating of the semiconductor cooling chip to increase the activity of the solid impurities. Once the solid reaches a certain temperature, the ultrasonic vibration device emits high-frequency vibrations, vibrating the structure of the cabinet 10. This breaks up the active solid impurities and discharges the impurity-containing gas into the containment space 20, thus achieving the effect of removing the solid impurities.

[0097] Specifically, see Figure 5 This is a schematic diagram of the working process of a frequency converter device provided in an embodiment of this application. The gas in the accommodating space 20 can be replaced by compression. Alternatively, the gas in the accommodating space 20 can be discharged first, and then replaced by introducing pressurized gas.

[0098] In one embodiment, the gas supply unit includes a compressor. The controller Control1 controls the opening of the inlet valve VFDIval and the outlet valve VFDOval, using the compressor C1 to charge pure nitrogen into the inverter device 100, expelling air from the inverter device 100 into the cabinet 10. The gas concentration inside the cabinet is determined by a nitrogen concentration monitoring device and a humidity detection device. The nitrogen concentration monitoring device directly monitors the nitrogen content; when the content reaches a threshold of 99%, or the humidity monitoring device detects an absolute humidity below 1%, the gas medium in the cabinet 10 is considered to have been replaced. This information is fed back to the controller. After determining the threshold criterion, the controller first closes the outlet control valve VFDOval and observes the pressure monitoring system. If the gas pressure inside the cabinet 10 is greater than the external ambient gas pressure, the gas medium replacement is considered complete. Then, the controller Control1 issues a command to close the inlet control valve VFDIval, ensuring that the gas pressure inside the cabinet 10 is slightly greater than the external ambient gas pressure. After the gas medium replacement is completed, the controller Control1 waits for a time T1 before controlling the compressor C1 to recover the gas in the pipe, and then shuts down the compressor C1.

[0099] Specifically, the gas supply unit also includes a first gas storage device R1 and a second gas storage device R2 for storing pure nitrogen. The gas source output of the first gas storage device R1 is connected to channel 1 of the first three-way valve Tval1, channel 2 is connected to the first inlet Cl1 of compressor C1, and channel 3 is connected to the outlet CO2 of compressor C1. Compressor C1 is a dual-channel unit, or two single-channel compressors can be used. The compressor outlet Cl1 is connected to the inlet control valve VFDIval of the frequency converter device 100, and the second inlet Cl2 of compressor C1 is connected to the outlet control valve VFDOval of the frequency converter device 100. When channels 1 and 2 of the first three-way valve Tval1 are opened, the inlet control valve VFDIval and the outlet control valve VFDOval of the frequency converter device 100 are opened, and channel 3 of the first three-way valve Tval1 is closed. After opening the gas release control valve AIval1 and starting compressor C1, the gas in the nitrogen storage device R1 can be filled into the cabinet 10, forcing out the air containing moisture from the cabinet 10 and into the environment. Since the released gas is air and the filling gas medium is a harmless gas such as nitrogen, this method can be used to replace air medium containing moisture.

[0100] In another embodiment, the second method for replacing the gas medium involves opening the inlet control valve VFDIval of the inverter device 100, opening the outlet control valve VFDOval, closing the gas release control valve AIval1, closing the three channels of the first three-way valve Tval1, opening the gas recovery control valve AIval2 of the second gas storage device R2, and opening channels 2 and 3 of the second three-way valve Tval2. The gas recovery device AR1, equipped with a vacuum pump, is then opened to extract air from the cabinet 10. Once the pressure monitoring system detects that the gas pressure in the cabinet 10 is below the threshold pressure, the controller Control1 issues a command to close the outlet control valve VFDOval of the inverter device 100, then close the interface control valve Tval2 of the gas recovery device AR1, and close the gas recovery control valve AIval2 of the second gas storage device R2. Subsequently, the gas recovery device AR1 stops, and the controller Control1 issues a command to open channels 1 and 2 of the first three-way valve Tval1, close channel 3 of the three-way valve, and start the compressor C1 to charge nitrogen medium into the inverter device 100. Once the pressure monitoring system detects that the gas pressure in cabinet 10 is greater than the ambient gas pressure, it sends a feedback to controller Control1, which then issues a command to close the inlet control valve VFDIval of inverter equipment 100. This closes channel 2 of the first three-way valve Tval1 and channel 1, stopping compressor C1. The gas medium replacement is then complete.

[0101] In one embodiment, when it is necessary to open cabinet 10 for inspection or other operations, nitrogen needs to be recovered. First, controller Control1 receives a recovery command and opens the inverter equipment 100 outlet control valve VFDOval, opens the gas source control valve NIval1 of the second gas storage device R2, and opens channels 2 and 3 of the second three-way valve Tval2. Gas recovery device AR1 is started, and the gas is dried and dust-removed by the drying treatment device 60 before being recovered into the independent first gas storage device R1. Once the gas pressure monitoring device detects that the gas pressure in cabinet 10 has dropped to the pressure threshold, the gas source control valve NIval1 of gas recovery device AR1 is closed, and channels 2 and 3 of the second three-way valve Tval2 are closed. Gas recovery device AR1 stops, and controller Control1 issues a command to open the gas release control valve AIval1. When the gas pressure monitoring device detects that the gas pressure inside cabinet 10 is the same as atmospheric pressure, it can be determined that the gas recovery is complete. At this time, cabinet 10 can be opened.

[0102] Using the inverter device 100 of this application, pure nitrogen or dry air can be stored through the first gas storage device R1 and the second gas storage device R2. By opening the first three-way valve Tval1 and the second three-way valve Tval2, the inlet control valve VFDIval and the outlet control valve VFDOval of the inverter device 100, the compressor C1 is started, realizing the internal gas pump circulation of the inverter device 100, circulating the original air out of the containment space 20, and removing moisture and impurities after drying and dust removal, dynamically maintaining a dry and pure environment in the inverter device 100.

[0103] Therefore, by adding a compressor, a gas recovery device AR1, a first gas storage device R1 and a second gas storage device R2, a controller Control1, a first three-way valve Tval1 and a second three-way valve Tval2, etc., to the outside of the cabinet 10 of this application, a set of pump flow sealing frequency converter equipment 100 is formed to achieve the purpose of zero condensation and ensure that the heat dissipation system inside the frequency converter equipment 100 can exert its heat dissipation capacity. In this way, the power modules such as IGBTs of the frequency converter can exert their maximum capacity and operate at the best effect.

[0104] Thus, this application achieves a constant internal temperature, humidity, and air pressure for the inverter equipment 100 by designing a well-sealed inverter device 100, establishing an internal gas circulation control system for the cabinet 10 through an air pressure regulating device, and a gas circulation control system connecting the internal and external parts of the inverter equipment 100. Furthermore, by assembling a temperature regulating device 30 and a drying treatment device 60, the application integrates these features. Combined with a temperature, pressure, and humidity monitoring system, the application also enables the self-regulating function of the internal operating environment of the cabinet 10.

[0105] According to another aspect of this application, a frequency converter device control method is provided, which can be applied to the frequency converter device 100 described in the above embodiments. The frequency converter device control method includes the following steps:

[0106] S10. Control the drying device to dry the pressurized gas flowing through it to the set humidity;

[0107] S20. The control air pressure regulating device delivers pressurized gas into the sealed accommodating space 20 of the cabinet 10 equipped with the frequency converter until the pressure in the accommodating space 20 stabilizes to the set pressure.

[0108] S30, the temperature regulating device 30 in the control compartment 20 regulates the air temperature in the control compartment 20 to the set temperature.

[0109] This achieves stable constant temperature, pressure, and humidity control within the internal enclosure 20 of the frequency converter 100, effectively preventing condensation. Furthermore, because the pressurized gas causes the pressure within the enclosure 20 to exceed atmospheric pressure, it increases the internal electrical insulation capacity and strength of the frequency converter 100. This allows for smaller gaps between electrical components during the design phase, enabling the frequency converter 100 to maintain its size or even decrease in size when its power is increased.

[0110] Understandably, steps S10-S30 can be performed simultaneously, or only one step can be performed as needed. Before the inverter device 100 is powered on, due to the saturated relative humidity in the air, condensation easily occurs when it encounters metal solids with a relatively low temperature compared to the air. Excessive condensation can easily lead to short circuits and overvoltages when the inverter device 100 is powered on. This application can remove humidity before the inverter device 100 is operated, improving operational safety, by supplying pressurized gas to the containment space 20 through a pressure regulating device. After the inverter device 100 has been powered on and running for a period of time, if the pressure in the containment space 20 drops below the set pressure due to certain factors, pressurized gas can still be supplied to the containment space 20 through the pressure regulating device to replace the gas that does not meet the requirements.

[0111] In one embodiment, step S20 specifically includes:

[0112] S21. Control the gas supply unit to deliver pressurized gas into the accommodating space 20 to squeeze the original gas in the accommodating space 20 into the gas recovery unit;

[0113] S22. Detect whether the pressure in the accommodating space 20 has reached the set pressure. If so, control the gas supply to stop.

[0114] Specifically, the pressure regulating device includes a gas supply component and a gas recovery component, both connected to the accommodating space 20. When the pressure inside the accommodating space 20 is lower than the set pressure, the gas supply component delivers pressurized gas into the accommodating space 20 to compress the existing gas inside the accommodating space 20 into the gas recovery component. This establishes a closed gas self-circulation system to maintain constant pressure control in the accommodating space 20, ensuring that the internal gas pressure of the frequency converter device 100 remains constant and is not affected by external environmental factors that could cause a pressure drop.

[0115] Specifically, the drying device 60 can be located between the gas supply unit and the cabinet 10, or between the gas recovery unit and the gas supply unit. When located between the gas supply unit and the cabinet 10, the pressurized gas supplied by the gas supply unit is processed to a set humidity by the drying device 60 before entering the cabinet 10. When located between the gas recovery unit and the gas supply unit, the recovered gas is processed to a set humidity by the drying device 60 before entering the gas supply unit, where it is pressurized and can be recycled, thus forming a closed gas circulation system.

[0116] In one embodiment, step S30 in the above embodiment specifically includes:

[0117] S31. Detect whether the temperature inside the accommodating space 20 is higher than the set temperature;

[0118] S32. If so, the temperature control device 30 includes a semiconductor cooling chip for cooling;

[0119] S33. If not, control the heating of the semiconductor cooling chip included in the temperature regulating device 30.

[0120] Specifically, the temperature regulating device 30 includes a thermoelectric cooler and a temperature monitoring system; when the temperature monitoring system detects that the temperature inside the accommodating space 20 is higher than the set temperature, it controls the thermoelectric cooler to cool. When the temperature inside the accommodating space 20 is lower than the set temperature, it controls the thermoelectric cooler to heat, thereby regulating the temperature of the accommodating space 20 inside the cabinet 10 to maintain a constant temperature.

[0121] Specifically, when the temperature monitoring system detects that the internal temperature of the cabinet 10 is too low, the semiconductor heating function is activated to increase the internal temperature of the cabinet 10. When the internal temperature of the cabinet 10 is too high, the semiconductor cooling function is activated to reduce the internal temperature of the cabinet 10, thereby maintaining a constant temperature in the internal space 20 of the inverter equipment 100 cabinet 10.

[0122] Using a semiconductor cooling chip, it has a faster response speed and occupies a smaller size compared to other devices, and can quickly regulate the temperature within the 20-inch enclosure.

[0123] In one embodiment, after completing steps S10-S30 above, the inverter device 100 is processed into a constant temperature, constant pressure, and stable humidity state. After long-term storage or long-term operation of the inverter device 100, moisture may seep in through accidental channels. Therefore, the inverter device control method further includes the following steps:

[0124] S40. Detect whether the humidity inside the accommodating space 20 is higher than the set humidity;

[0125] S50. If so, control the gas supply unit to continuously supply pressurized gas at a set humidity to the accommodating space 20 or simultaneously control the semiconductor cooling chip to heat up until the humidity in the accommodating space 20 reaches the set humidity.

[0126] Specifically, to prevent moisture from accidentally seeping in during long-term operation, a humidity monitoring system monitors the humidity of the containment space 20. When the relative humidity inside the containment space 20 is high, the high-humidity gas inside can be discharged by displacement, and pressurized gas that meets the requirements at the set humidity level can be introduced to regulate the humidity.

[0127] Furthermore, when the relative humidity in the containment space 20 is high enough to cause condensation on the device, the semiconductor cooling chip heating function is activated simultaneously to raise the temperature in the containment space 20, evaporate the condensation, and turn it into steam. The gas in the containment space 20 is replaced by a pressure regulating device, and the steam is carried away until the set requirements are met. Then the semiconductor cooling chip is turned off, thereby ensuring that the temperature, humidity, and air pressure in the inverter equipment 100 are constant.

[0128] In one embodiment, in addition to steps S40-S50 described above, the following steps are also included:

[0129] S60. Check if the pressure inside the container is lower than the set pressure;

[0130] S70. If so, the control air pressure regulating device continuously supplies pressurized gas at the set humidity to the containment space 20 until the pressure in the containment space 20 stabilizes at the set pressure.

[0131] Specifically, the frequency converter device 100 also includes a pressure monitoring system. When the pressure monitoring system detects that the pressure in the accommodating space 20 is lower than the set pressure, it controls the air pressure regulating device to continuously supply pressurized gas into the accommodating space 20 until the pressure in the accommodating space 20 stabilizes to the set pressure.

[0132] In actual operation, S31, S40 and S60 can be performed simultaneously, as can S32 or S33, and S50 and S70, so that the accommodating space 20 can be controlled at constant temperature, constant pressure and constant humidity simultaneously.

[0133] Thus, this application, by designing a well-sealed inverter device 100, using the whip adjustment method provided in this application, establishes an internal gas circulation control system for the cabinet 10 through a pressure regulating device, a gas circulation control system connecting the internal and external parts of the inverter device 100, and equips it with a temperature regulating device 30 and a drying treatment device 60, thereby achieving a constant internal temperature, humidity, and air pressure for the inverter device 100. Furthermore, combined with a temperature, pressure, and humidity monitoring system, it achieves a self-regulating function for the internal operating environment of the cabinet 10.

[0134] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0135] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A frequency converter device, characterized in that, include: The cabinet (10) has a closed storage space (20). The frequency converter is installed in the accommodating space (20); A pressure regulating device is connected to the accommodating space (20). The pressure regulating device is used to deliver pressurized gas into the accommodating space (20) until the pressure in the accommodating space (20) is stabilized to a set pressure. A temperature regulating device (30) is provided in the accommodating space (20) for regulating the temperature in the accommodating space (20) to stabilize to a set temperature; A drying device (60) is disposed between the air pressure regulating device and the cabinet (10). The drying device (60) is used to dry the pressurized gas to be transported to a set humidity. The air pressure regulating device includes a gas supply component and a gas recovery component that are both connected to the accommodating space (20). The drying treatment device (60) is located between the gas supply component and the cabinet (10) or between the gas recovery component and the gas supply component. When it is necessary to replace the gas medium in the accommodating space (20), the gas supply unit delivers pressurized gas into the accommodating space (20) to squeeze the original gas in the accommodating space (20) into the gas recovery unit. After the gas pressure in the cabinet (10) is detected to be greater than the ambient gas pressure, the gas medium replacement is completed. The gas supply component includes a compressor C1 and a first gas storage device R1; the gas source output of the first gas storage device R1 is connected to a first three-way valve channel 1, the first three-way valve channel 2 is connected to the first inlet C11 of the compressor C1, and the first three-way valve channel 3 is connected to the outlet CO2 of the compressor C1; the compressor outlet CO1 is connected to the inlet control valve of the frequency converter, and the second inlet C12 of the compressor C1 is connected to the outlet control valve of the frequency converter. When it is necessary to open the cabinet (10) for inspection, the gas recovery device is activated and the gas is recovered into the independent first gas storage device R1. After the gas pressure in the cabinet (10) drops to the pressure threshold, the gas recovery device is closed and the gas release control valve is opened. When the gas pressure in the cabinet (10) is the same as the atmospheric pressure, the cabinet (10) is opened.

2. The frequency converter device according to claim 1, characterized in that, The temperature regulating device (30) includes a semiconductor cooling chip and a temperature monitoring system; When the temperature monitoring system detects that the temperature inside the accommodating space (20) is higher than the set temperature, it controls the semiconductor cooling chip to cool down; When the temperature monitoring system detects that the temperature inside the accommodating space (20) is lower than the set temperature, it controls the semiconductor cooling chip to heat up.

3. The frequency converter device according to claim 2, characterized in that, The frequency converter device (100) also includes a humidity monitoring system; When the humidity monitoring system detects that the humidity in the accommodating space (20) is higher than the set humidity, it controls the air pressure regulating device to continuously deliver the pressurized gas at the set humidity into the accommodating space (20) or simultaneously controls the semiconductor cooling chip to heat up until the humidity in the accommodating space (20) is the set humidity.

4. The frequency converter device according to claim 1, characterized in that, The frequency converter device (100) also includes a pressure monitoring system; When the pressure monitoring system detects that the pressure in the accommodating space (20) is lower than the set pressure, it controls the gas pressure regulating device to continuously supply pressurized gas into the accommodating space (20) until the pressure in the accommodating space (20) stabilizes to the set pressure.

5. The frequency converter device according to claim 1, characterized in that, The frequency converter device (100) also includes a dust removal device (40), which is located within the accommodating space (20); The dust removal device (40) is used to remove the dust adsorbed on the cabinet (10).

6. The frequency converter device according to claim 5, characterized in that, The dust removal device (40) is an ultrasonic vibration device.

7. A method for controlling a frequency converter device, characterized in that, A device for controlling the frequency converter equipment according to any one of claims 1-6, comprising the following steps: The control drying device dries the pressurized gas flowing through it to a set humidity level; Control the opening of the first three-way valve channel 1, channel 2, inverter equipment 100 inlet control valve and outlet control valve, and close the first three-way valve channel 3. Control the opening of the gas release control valve and control the compressor C1 to deliver the pressurized gas into the accommodating space (20) to squeeze the original gas in the accommodating space (20) into the gas recovery unit. Detect whether the pressure in the accommodating space (20) has reached the set pressure; if so, control the gas supply to stop. The temperature regulating device (30) in the accommodating space (20) regulates the air temperature in the accommodating space (20) to the set temperature.

8. The inverter equipment control method according to claim 7, characterized in that, The step of the temperature regulating device (30) controlling the temperature inside the accommodating space (20) to regulate the air temperature inside the accommodating space (20) to a set temperature specifically includes: Detect whether the temperature inside the accommodating space (20) is higher than the set temperature; If so, the temperature regulating device (30) includes a semiconductor cooling chip for cooling; If not, the temperature regulating device (30) includes a semiconductor cooling chip for heating.

9. The inverter equipment control method according to claim 8, characterized in that, It also includes the following steps: Detect whether the humidity inside the accommodating space (20) is higher than the set humidity; If so, control the air pressure regulating device to continuously supply the pressurized gas at the set humidity to the accommodating space (20) or simultaneously control the semiconductor cooling chip to heat up until the humidity in the accommodating space (20) is the set humidity.

10. The inverter equipment control method according to claim 9, characterized in that, It also includes the following steps: Detect whether the pressure inside the container is lower than the set pressure; If so, the pressure regulating device continuously supplies the pressurized gas at the set humidity to the accommodating space (20) until the pressure in the accommodating space (20) stabilizes to the set pressure.

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