A temperature and humidity control drawer type modular variable frequency cabinet and a temperature and humidity control method
Through modular design and innovative heat dissipation and dehumidification technologies, the structural flexibility, heat dissipation and dehumidification issues of the frequency converter cabinet have been solved, achieving efficient thermal shock buffering and heatless dehumidification, thus improving the stability and ease of maintenance of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- XIAMEN JUCHUANG TECH CO LTD
- Filing Date
- 2026-05-20
- Publication Date
- 2026-07-14
Smart Images
Figure CN122395908A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of variable frequency cabinet temperature and humidity control technology, specifically relating to a temperature and humidity control drawer-type modular variable frequency cabinet and a temperature and humidity control method. Background Technology
[0002] Variable frequency drive (VFD) cabinets, as core equipment in industrial automation control systems, are widely used in industries such as metallurgy, chemical engineering, building materials, and machinery for variable frequency speed control of AC motors. However, with the increasing demands for equipment integration and reliability in industrial production, traditional VFD cabinets have gradually revealed a series of problems in terms of structural design, heat dissipation management, and environmental adaptability.
[0003] Firstly, in terms of structural layout and installation, most existing frequency converter cabinets adopt a fixed frame structure with integral welding or simple bolt connections. This structural form lacks flexibility, making on-site assembly and expansion difficult. Furthermore, when faced with a mixed arrangement of frequency converters and control components of different power levels, it is often difficult to achieve rational space utilization. Traditional cabinet designs typically mix or simply separate high-voltage frequency converter units and low-voltage control units, lacking effective modular isolation, leading to cumbersome maintenance and a higher risk of electrical interference. In addition, the sealing and connection processes of traditional cabinets are relatively crude, making them unsuitable for harsh industrial environments.
[0004] Secondly, heat dissipation management is a severe challenge for frequency converter cabinets. Frequency converter power devices (such as IGBTs) generate a large amount of heat during operation, especially during startup, braking, or periods of drastic load fluctuation, resulting in instantaneous thermal shocks. Existing heat dissipation solutions mainly rely on air cooling (fans) or liquid cooling. However, air cooling systems are highly dependent on the environment and easily attract dust, leading to dust accumulation and blockage. More importantly, traditional aluminum heat sinks have limited heat capacity; when faced with the rapid temperature rise caused by instantaneous overload, they often cannot dissipate heat quickly enough, easily causing overheating protection or even burnout of the devices. Existing heat dissipation technologies lack a passive heat storage mechanism that can "smooth out peaks and fill valleys" and effectively buffer instantaneous thermal shocks.
[0005] Finally, temperature and humidity control are also key factors affecting the lifespan of inverter cabinets. Industrial environments are often complex, with large diurnal temperature variations or high humidity, making condensation easily form inside the cabinet, leading to short circuits or corrosion of electrical components. Traditional anti-condensation methods typically involve installing heaters (such as PTC heaters) to lower relative humidity by raising the cabinet's internal temperature. However, this method has an inherent contradiction: in summer or when the inverter is operating under high load, the cabinet temperature is already too high; turning on the heater for moisture prevention further deteriorates the inverter's heat dissipation environment, increasing the risk of failure. Existing dehumidification methods struggle to achieve efficient and silent dehumidification without increasing the cabinet's heat load.
[0006] Given the shortcomings of the existing technologies, developing a modular variable frequency drive (VFD) cabinet with flexible assembly, thermal shock resistance, and heatless dehumidification capability has become an urgent technical problem to be solved. Summary of the Invention
[0007] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a temperature and humidity control drawer-type modular frequency converter cabinet and a temperature and humidity control method, which has controllable temperature and humidity and modular design, and the cabinet can be assembled and customized according to actual needs.
[0008] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a temperature and humidity control drawer-type modular frequency converter cabinet and a temperature and humidity control method, including a bottom frame, two top plates, a main cabinet, multiple front frequency converter cabinets and multiple rear control cabinets. The main cabinet is set on the upper surface of the bottom frame. The front frequency converter cabinets and rear control cabinets are set together, and multiple sets of front frequency converter cabinets, rear control cabinets and the main cabinet are set on the bottom frame. The opening and closing door of the main cabinet faces the front side of the bottom frame, and the opening and closing door of the rear control cabinet faces the rear side of the bottom frame. The front inverter cabinet includes a first top mount, a first base, and four uprights arranged in a matrix. The first top mount is connected above the four uprights, and the first base is connected below the four uprights. Each upright has a first straight surface, a first inclined surface, and a second straight surface on its inward side. The first straight surface and the second straight surface are connected by the first inclined surface. A first mounting hole is formed on the first straight surface and the second straight surface. A connecting plate is provided between two uprights on the side. An air inlet is formed below the opening and closing door of the main cabinet, and an air outlet is formed above the first top mount. An electrically conductive polymer solid electrolyte membrane is formed on the switch door of the main cabinet. When the humidity difference between the inside and outside of the cabinet is greater than 10%RH, the electrically conductive polymer solid electrolyte membrane is automatically powered on, or when the humidity difference between adjacent front inverter cabinets is greater than 5%RH, the electrically conductive polymer solid electrolyte membrane in the corresponding front inverter cabinet is activated. An aluminum alloy PCM heat exchange plate is installed between two columns near the rear control cabinet. The number of aluminum alloy PCM heat exchange plates corresponds to the number of frequency converter cabinet bodies placed in the front frequency converter cabinet. When the temperature of the frequency converter cabinet body rises to 60°C, the PCM material in the aluminum alloy PCM heat exchange plate changes from solid to liquid and absorbs heat to control the temperature. One of the top plates connects the main cabinet and the upper surfaces of multiple front frequency converter cabinets, while the other top plate connects the main cabinet and the upper surfaces of multiple rear control cabinets.
[0009] Furthermore, an installation hole is provided above the switch door of the main cabinet. The energized polymer solid electrolyte membrane is installed in the installation hole. The energized polymer solid electrolyte membrane includes a mold body and wires. The mold body is fitted into the installation hole, with the positive electrode of the mold body facing outward and the negative electrode facing inward. The wires are electrically connected to the mold body and to the control code and power supply components of the frequency converter cabinet. The energized polymer solid electrolyte membrane is energized when the humidity inside the cabinet is 10 degrees higher than the humidity outside the cabinet.
[0010] Furthermore, the aluminum alloy PCM heat spreader includes a mounting box with a cavity inside, the cavity being filled with composite PCM material, and the surface of the mounting box being in contact with the back of the frequency converter cabinet body after installation.
[0011] Furthermore, the first base has a closed-loop continuous first missing ring formed on its circumferential sidewall, and each of the four planes of the first missing ring is provided with a downwardly inclined first locking plate. The first top seat has a closed-loop continuous second missing ring formed on its circumferential sidewall, and each of the four planes of the second missing ring is provided with an upwardly inclined second card plate.
[0012] Furthermore, the connecting plate has a plurality of first card holes arranged in a matrix, and a first connecting hole is provided between adjacent first card holes.
[0013] Furthermore, an inverted L-shaped enclosure is formed on the upper surface of the first base, and a plurality of second locking holes are formed on the upper surface and the inward side of the inverted L-shaped enclosure, with a second connecting hole provided between adjacent second locking holes.
[0014] Furthermore, the inverted L-shaped enclosure located on both sides of the door is provided with a support block. The support block includes a base and a fastening plate. A through hole is formed at the bottom of the base, extending through the inverted L-shaped enclosure. The fastening plate is connected to the upper end of the base and rests on the upper surface of the inverted L-shaped enclosure. A third locking hole corresponding to the second locking hole and a third connecting hole corresponding to the second connecting hole are formed on the fastening plate.
[0015] Furthermore, an air outlet seat is provided above the air outlet grille of the first top seat, and air outlet holes are provided on the front and rear sides of the air outlet seat. Extension plates are formed at both ends of the upper surface of the air outlet seat, and V-shaped backflow plates are connected to the ends of the extension plates. The extension plates are located above the air outlet holes.
[0016] Furthermore, the inverter cabinet body is equipped with encapsulation plates on two sides and the back. The upper and lower ends of the encapsulation plates are respectively provided with a third card plate and a fourth card plate. The third card plate is engaged with the second card plate by a buckle, and the fourth card plate is engaged with the first card plate by a buckle. A sealing strip is provided between the encapsulation plate and the main cabinet body.
[0017] further, When the temperature difference between the inside and outside of the cabinet is within 5℃ and the humidity difference between the inside and outside of the cabinet is within 10%RH, air enters through the air inlet grille, passes through the inverter cabinet body, and is blown out through the air outlet grille. When the humidity difference between the inside and outside of the cabinet is greater than 10%RH, the electrified polymer solid electrolyte membrane will convert the water molecules inside the cabinet into hydrogen ions and oxygen ions. The hydrogen ions will pass through the electrified polymer solid electrolyte membrane to the outside of the cabinet. Alternatively, when the humidity difference between adjacent front inverter cabinets is greater than 5%RH, the electrified polymer solid electrolyte membrane on the front inverter cabinet with higher humidity inside the cabinet will convert the water molecules inside the cabinet into hydrogen ions and oxygen ions. The hydrogen ions will pass through the electrified polymer solid electrolyte membrane to the outside of the cabinet, and a warning will be given. When the temperature of the frequency converter cabinet rises sharply to 60℃, the composite PCM material in the aluminum alloy PCM heat spreader melts and absorbs heat, thus reducing the temperature of the frequency converter cabinet.
[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. Possesses "peak shaving and valley filling" thermal buffering capabilities to protect core components: This invention innovatively installs an aluminum alloy PCM heat spreader plate on the inner side of the encapsulation board near the back of the front inverter cabinet, located between two pillars. Utilizing the composite PCM material filling the cavity of the mounting box, when the inverter cabinet body operates under high load causing a rapid temperature rise (e.g., reaching 60°C), the composite PCM material undergoes a phase change and melts, absorbing heat. This passive heat absorption mechanism effectively absorbs instantaneous thermal shocks, slows down the temperature rise rate inside the cabinet, and solves the problem of lag in response of traditional air-cooled heat dissipation when dealing with peak thermal loads.
[0019] 2. High space utilization and strong anti-interference capability: This invention achieves a high-density space layout by setting a base frame and arranging the main cabinet and multiple sets of front frequency converter cabinets and rear control cabinets that fit back-to-back. This physical isolation structure of the front frequency converter cabinet and the rear control cabinet not only significantly reduces the floor space occupied by the equipment, but also effectively isolates the electromagnetic interference between the high-voltage side of the frequency converter and the low-voltage side of the control cabinet, thus improving the stability of system operation.
[0020] 3. Achieve heatless, silent dehumidification, avoiding "heat upon heat": Addressing the issue of overheating in traditional heating dehumidification methods, this invention incorporates an electrically conductive polymer solid electrolyte membrane at the mounting holes of the front inverter cabinet's door. When the humidity inside the cabinet exceeds the outside humidity by 10 degrees Celsius, or when the humidity difference between adjacent inverter cabinets is 5 degrees Celsius, the membrane becomes energized, decomposing water molecules inside the cabinet into hydrogen ions and oxygen. The hydrogen ions pass through the membrane and are expelled outside the cabinet. This electrochemical dehumidification method generates no sensible heat, achieving highly efficient moisture prevention in summer or high-temperature conditions, completely eliminating the conflict between dehumidification and heat dissipation.
[0021] 4. Modular assembly structure for convenient installation and maintenance: This invention abandons the traditional integral welding structure, utilizing a first locking plate on the first notched ring of the first base's circumferential side wall, a second locking plate on the second notched ring of the first top seat's circumferential side wall, and a third and fourth locking plate on the encapsulation plate for snap-fit connection. Combined with the matrix-arranged second locking holes and bearing blocks on the inverted L-shaped enclosure, the cabinet assembly becomes as flexible as "building blocks," greatly reducing transportation costs and on-site construction difficulty. It also facilitates independent modular replacement of the front frequency converter cabinet or the rear control cabinet later.
[0022] 5. Optimized air duct and protection design: This invention features an air outlet seat above the air outlet grille of the first top seat, connected to a V-shaped backflow plate via an extension plate. This V-shaped backflow plate, located above the air outlet, ensures smooth exhaust of hot air while effectively preventing condensate from flowing back into the cabinet through the air outlet, thus enhancing the overall protection level of the unit. Attached Figure Description
[0023] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the air outlet location in this invention; Figure 3 This is a schematic diagram of the front view of the hidden encapsulation plate of the front frequency converter cabinet and the structure after opening and closing the door in this invention; Figure 4 This is a three-dimensional structural diagram of the hidden encapsulation board in the front frequency converter cabinet of the present invention; Figure 5 This is a three-dimensional structural diagram of the hidden encapsulation plate of the front frequency converter cabinet and the aluminum alloy PCM heat dissipation plate in this invention. Figure 6 For the present invention Figure 5 A magnified schematic diagram of the structure at point A in the middle.
[0024] The diagram shows the following markings: 1. Base frame; 2. Top plate; 3. Main cabinet; 4. Front inverter cabinet; 41. First top seat; 411. Second mounting plate; 42. First base; 421. First mounting plate; 422. Inverted L-shaped enclosure; 4221. Second mounting hole; 4222. Second connecting hole; 423. Bearing block; 4231. Seat; 4232. Fastening plate; 43. Column; 431. First straight surface; 432. First inclined surface; 433. Second straight surface; 434. First mounting hole; 435. Connecting plate; 45. Switch door; 451. Air inlet grille; 46. Air outlet seat; 461. Air outlet grille; 462. Extension plate; 463. V-shaped backflow plate; 47. Aluminum alloy PCM heat spreader; 471. Mounting box; 472. Composite PCM material; 5. Rear control cabinet; 6. Electrically conductive polymer solid electrolyte membrane. Detailed Implementation
[0025] To make the above features and advantages of the present invention more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings for detailed explanation.
[0026] like Figures 1-6 As shown, this embodiment provides a temperature and humidity control drawer-type modular frequency converter cabinet and a temperature and humidity control method, which consists of a bottom frame 1, two top plates 2, a main cabinet 3, multiple front frequency converter cabinets 4 and multiple rear control cabinets 5.
[0027] The main cabinet 3 is located at the center of the upper surface of the base frame 1. To achieve high-density space utilization, the front frequency converter cabinet 4 and the rear control cabinet 5 are arranged in a back-to-back configuration, with multiple sets of front frequency converter cabinets 4 and rear control cabinets 5, along with the main cabinet 3, arranged together on the base frame 1. The opening and closing doors 45 of the main cabinet 3 face the front of the base frame 1, while the opening and closing doors 45 of the rear control cabinets 5 face the rear of the base frame 1, achieving physical separation of the power and low-voltage maintenance channels. The main cabinet 3 is connected to the front frequency converter cabinets 4 and the rear control cabinets 5 via two top plates 2. One top plate 2 connects the main cabinet 3 to the upper surfaces of multiple front frequency converter cabinets 4, and the other top plate 2 connects the main cabinet 3 to the upper surfaces of multiple rear control cabinets 5.
[0028] In this scheme, the bottom frame 1 is composed of rectangularly arranged square tubes. Inside the rectangularly arranged square tubes, according to the width of the front frequency converter cabinet 4 and the rear control cabinet 5, there are also stabilizing square tubes arranged along the length of the rectangularly arranged square tubes.
[0029] To enable modular and rapid assembly, this embodiment features a special design in the connection structure of the front inverter cabinet 4.
[0030] The front inverter cabinet 4 includes a first top mount 41, a first base 42, and four uprights 43. The four uprights 43 are arranged in a matrix. The first top mount 41 is connected above the four uprights 43, and the first base 42 is connected below the four uprights 43. Each upright 43 has a first straight surface 431, a first inclined surface 432, and a second straight surface 433 on its inward side. The first straight surface 431 and the second straight surface 433 are connected by the first inclined surface 432. First mounting holes 434 are formed on the first straight surface 431 and the second straight surface 433. A connecting plate 435 is provided between the two columns 43; an air inlet 451 is formed below the switch door 45 of the main cabinet 3, and an air outlet 461 is formed above the first top seat 41; an electrically conductive polymer solid electrolyte membrane 6 is formed on the switch door 45 of the main cabinet 3; an aluminum alloy PCM heat spreader 47 is installed between the two columns 43 near the rear control cabinet 5; one of the top plates 2 connects the main cabinet 3 and the upper surfaces of multiple front frequency converter cabinets 4, and the other top plate 2 connects the main cabinet 3 and the upper surfaces of multiple rear control cabinets 5.
[0031] Preferably, the number of connecting plates 435 can be set in multiple sets, which can be set up vertically. In this way, multiple frequency converter cabinets can be integrated into the same front frequency converter cabinet 4. During the installation of the frequency converter cabinet, slide rails are set on the connecting plates 435 and corresponding sliders are set on the side wall of the frequency converter cabinet, so that it can be installed by pushing and pulling, like a drawer. When installing the connecting plates 435 at high positions, the frequency converter cabinet will be sent to the designated position by a lifting mechanism (such as a jack-like structure) and then pushed in to be installed in the front frequency converter cabinet 4.
[0032] The circumferential sidewall of the first base 42 forms a closed-loop continuous first missing ring, and each of the four planes of this first missing ring is provided with a downwardly inclined first retaining plate 421. Correspondingly, the circumferential sidewall of the first top seat 41 forms a closed-loop continuous second missing ring, and each of its four planes is provided with an upwardly inclined second retaining plate 411. Encapsulation plates are installed on the sides and back of the inverter cabinet body, and the upper and lower ends of these encapsulation plates are respectively provided with a third retaining plate and a fourth retaining plate. During installation, the third retaining plate engages with the second retaining plate 411, and the fourth retaining plate engages with the first retaining plate 421, and are used in conjunction with a sealing strip to achieve screwless, quick, and sealed installation.
[0033] To better accommodate inverter cabinets of different sizes, this embodiment features an inverted L-shaped enclosure 422 folded inward on the upper surface of the first base 42. The inverted L-shaped enclosure 422 has a second locking hole 4221 and a second connecting hole 4222. Support blocks 423 are also provided on the inverted L-shaped enclosures 422 on both sides of the switch door 45. Each support block 423 includes a base 4231 and a fastening plate 4232. The fastening plate 4232 rests on the inverted L-shaped enclosure 422 and is positioned and fastened to the enclosure through the third locking hole and the third connecting hole. The distance between the support blocks 423 and the enclosure can be adjusted according to the size of the inverter cabinet.
[0034] This embodiment integrates three major functions: active ventilation, passive heat storage, and silent dehumidification. Ventilation and rainproof structure: An air inlet 451 is located below the main cabinet door 45, and an air outlet 461 is located above the first top seat 41. The fan can be located inside or outside the air inlet 451, depending on the dimensions of the inverter cabinet body and the external dimensions of the cabinet. To prevent external rainwater from flowing back in, an air outlet seat 46 is installed above the air outlet 461. The end of the extension plate 462 of the air outlet seat 46 is connected to a V-shaped backflow plate 463 located above the air outlet, effectively blocking rainwater intrusion.
[0035] PCM Phase Change Heat Dissipation: An aluminum alloy PCM heat exchanger plate 47 is installed between two columns 43 near the rear control cabinet 5. This aluminum alloy PCM heat exchanger plate 47 includes a mounting box 471, the cavity inside of which is filled with composite PCM material 472 (phase change heat storage material). During installation, the surface of the mounting box 471 is directly and tightly attached to the back of the inverter cabinet body to absorb peak heat.
[0036] Preferably, to address the issue of the low thermal conductivity of the composite PCM material 472, the cavity of the mounting housing 471 is filled with open-cell aluminum foam or an aluminum honeycomb skeleton. The composite PCM material 472 is filled into the micropores of the aluminum foam using a vacuum impregnation process. This interpenetrating network structure of metal skeleton + phase change material increases the overall thermal conductivity of the PCM board by 5-10 times, ensuring that heat can be rapidly conducted to the depths of the PCM board at the moment of thermal shock from the IGBT, achieving instantaneous temperature uniformity.
[0037] Electrolyte membrane dehumidification: An installation hole is provided above the switch door 45 of the main cabinet 3, where an electrically conductive polymer solid electrolyte membrane 6 is embedded. The membrane fits into the hole, with its positive electrode facing outwards and its negative electrode (moisture-absorbing surface) facing inwards. Wires connect to the control power supply components of the frequency converter cabinet.
[0038] Based on the above structure, the frequency converter cabinet in this embodiment controls temperature and humidity according to the following logic: Regular ventilation: When the temperature difference between the inside and outside of the cabinet is within 5°C and the humidity difference is within 10%RH, the system adopts natural or auxiliary ventilation. The airflow enters from the air inlet 451, flows through the inverter cabinet body, and is blown out from the air outlet 461 at the top.
[0039] Silent dehumidification: When the sensor detects that the humidity difference between the inside and outside of the cabinet is greater than 10%RH (or reaches the condensation risk threshold), the energized polymer solid electrolyte membrane 6 is powered on. At this time, water molecules inside the cabinet are electrolyzed into hydrogen ions and oxygen on the membrane surface. The hydrogen ions pass through the membrane to the outside of the cabinet and combine with oxygen, thereby expelling the moisture from the cabinet. This process does not generate heat.
[0040] Alternatively, if the humidity difference between adjacent front inverter cabinets is 5%RH, the energized polymer solid electrolyte membrane 6 on the front inverter cabinet with higher humidity will be energized. Water molecules inside the cabinet will be electrolyzed into hydrogen ions and oxygen on the membrane surface. The hydrogen ions will pass through the membrane to the outside of the cabinet and combine with oxygen. After the humidity drops, if the humidity difference between adjacent front inverter cabinets is still 5 degrees within 1 hour, the energized polymer solid electrolyte membrane 6 on the front inverter cabinet with higher humidity will be energized and an alarm will be triggered immediately, notifying the staff to carry out timely maintenance.
[0041] Another approach is to calculate the current dew point temperature (set value, based on the frequency converter cabinet) based on the cabinet temperature and relative humidity. Temperature sensors are installed at key component locations of the frequency converter inside the cabinet. When the surface temperature of each detection point inside the cabinet approaches the dew point temperature (less than 3°C), the energized polymer solid electrolyte membrane 6 is forcibly activated to dehumidify, regardless of the difference in humidity between inside and outside, thus eliminating condensation at its source.
[0042] Peak Shaving Heat Dissipation: When the inverter cabinet is under high load, causing the temperature to rise sharply to 60℃ (the phase change point of PCM material), the composite PCM material 472 in the aluminum alloy PCM heat dissipation plate 47 attached to the back begins to change from solid to liquid. In this process, it absorbs a large amount of latent heat, thereby forcibly clamping the temperature rise of core components such as IGBT and reducing the temperature of the inverter cabinet.
[0043] Nighttime Regeneration Mode: When the inverter is shut down or under low load, and the temperature of the aluminum alloy PCM vapor chamber plate 47 is still higher than its freezing point (set value), the system controls the fan at the air intake grille 451 to run continuously at low speed. Utilizing the lower ambient temperature at night, the heat stored in the PCM plate is forcibly removed, causing it to change from a liquid to a solid state, thus reserving 'cooling capacity' for the high-load operation the next day.
[0044] The foregoing has shown and described the basic principles and main features of the present invention, as well as its advantages. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.
Claims
1. A temperature and humidity control drawer-type modular frequency converter cabinet, characterized in that: The system includes a base frame, two top plates, a main cabinet, multiple front frequency converter cabinets, and multiple rear control cabinets. The main cabinet is located on the upper surface of the base frame. The front frequency converter cabinets and rear control cabinets are fitted together, forming a group. Multiple groups of front frequency converter cabinets, rear control cabinets, and the main cabinet are mounted on the base frame. The opening and closing doors of the main cabinet face the front of the base frame, and the opening and closing doors of the rear control cabinets face the rear of the base frame. The front inverter cabinet includes a first top mount, a first base, and four uprights arranged in a matrix. The first top mount is connected above the four uprights, and the first base is connected below the four uprights. Each upright has a first straight surface, a first inclined surface, and a second straight surface on its inward side. The first straight surface and the second straight surface are connected by the first inclined surface. A first mounting hole is formed on the first straight surface and the second straight surface. A connecting plate is provided between two uprights on the side. An air inlet is formed below the opening and closing door of the main cabinet, and an air outlet is formed above the first top mount. An electrically conductive polymer solid electrolyte membrane is formed on the switch door of the main cabinet. When the humidity difference between the inside and outside of the cabinet is greater than 10%RH, the electrically conductive polymer solid electrolyte membrane is automatically powered on, or when the humidity difference between adjacent front inverter cabinets is greater than 5%RH, the electrically conductive polymer solid electrolyte membrane in the corresponding front inverter cabinet is activated. An aluminum alloy PCM heat exchange plate is installed between two columns near the rear control cabinet. The number of aluminum alloy PCM heat exchange plates corresponds to the number of frequency converter cabinet bodies placed in the front frequency converter cabinet. When the temperature of the frequency converter cabinet body rises to 60°C, the PCM material in the aluminum alloy PCM heat exchange plate changes from solid to liquid and absorbs heat to control the temperature. One of the top plates connects the main cabinet and the upper surfaces of multiple front frequency converter cabinets, while the other top plate connects the main cabinet and the upper surfaces of multiple rear control cabinets.
2. The temperature and humidity control drawer-type modular frequency converter cabinet according to claim 1, characterized in that: An installation hole is provided above the switch door of the main cabinet. The energized polymer solid electrolyte membrane is installed in the installation hole. The energized polymer solid electrolyte membrane includes a mold body and wires. The mold body is fitted into the installation hole, with the positive electrode of the mold body facing outward and the negative electrode facing inward. The wires are electrically connected to the mold body and to the control code and power supply components of the frequency converter cabinet. The energized polymer solid electrolyte membrane is energized when the humidity inside the cabinet is 10 degrees higher than the humidity outside the cabinet.
3. The temperature and humidity control drawer-type modular frequency converter cabinet according to claim 1, characterized in that: The aluminum alloy PCM heat spreader includes a mounting box with a cavity inside. The cavity is filled with composite PCM material, and the surface of the mounting box is in contact with the back of the frequency converter cabinet body after installation.
4. The temperature and humidity control drawer-type modular frequency converter cabinet according to claim 1, characterized in that: The first base has a closed-loop continuous first missing ring formed on its circumferential sidewall, and each of the four planes of the first missing ring is provided with a first card plate that is inclined downwards. The first top seat has a closed-loop continuous second missing ring formed on its circumferential sidewall, and each of the four planes of the second missing ring is provided with an upwardly inclined second card plate.
5. The temperature and humidity control drawer-type modular frequency converter cabinet according to claim 1, characterized in that: The connecting plate has a plurality of first card holes arranged in a matrix, and a first connecting hole is provided between adjacent first card holes.
6. The temperature and humidity control drawer-type modular frequency converter cabinet according to claim 1, characterized in that: The upper surface of the first base has an inverted L-shaped enclosure that folds inward. The upper surface and the inward side of the inverted L-shaped enclosure have a plurality of second locking holes arranged in a matrix, and a second connecting hole is provided between adjacent second locking holes.
7. A temperature and humidity control drawer-type modular frequency converter cabinet according to claim 6, characterized in that: The inverted L-shaped enclosure located on both sides of the door is provided with a support block. The support block includes a base and a fastening plate. A through hole is formed at the bottom of the base, extending through the inverted L-shaped enclosure. The fastening plate is connected to the upper end of the base and rests on the upper surface of the inverted L-shaped enclosure. A third locking hole corresponding to the second locking hole and a third connecting hole corresponding to the second connecting hole are formed on the fastening plate.
8. The temperature and humidity control drawer-type modular frequency converter cabinet according to claim 1, characterized in that: An air outlet seat is provided above the air outlet grille of the first top seat. Air outlet holes are provided on the front and rear sides of the air outlet seat. Extension plates are formed at both ends of the upper surface of the air outlet seat. A V-shaped backflow plate is connected to the end of the extension plate. The extension plate is located above the air outlet hole.
9. A temperature and humidity control drawer-type modular frequency converter cabinet according to claim 4, characterized in that: The inverter cabinet body is equipped with encapsulation plates on two sides and the back. The upper and lower ends of the encapsulation plates are respectively provided with a third card plate and a fourth card plate. The third card plate is engaged with the second card plate by a buckle, and the fourth card plate is engaged with the first card plate by a buckle. A sealing strip is provided between the encapsulation plate and the main cabinet body.
10. The temperature and humidity control method for a modular, drawer-type frequency converter cabinet according to claim 1, characterized in that: Includes the following steps: When the temperature difference between the inside and outside of the cabinet is within 5℃ and the humidity difference between the inside and outside of the cabinet is within 10%RH, air enters through the air inlet grille, passes through the inverter cabinet body, and is blown out through the air outlet grille. When the humidity difference between the inside and outside of the cabinet is greater than 10%RH, the electrified polymer solid electrolyte membrane will convert the water molecules inside the cabinet into hydrogen ions and oxygen ions. The hydrogen ions will pass through the electrified polymer solid electrolyte membrane to the outside of the cabinet. Alternatively, when the humidity difference between adjacent front inverter cabinets is greater than 5%RH, the electrified polymer solid electrolyte membrane on the front inverter cabinet with higher humidity inside the cabinet will convert the water molecules inside the cabinet into hydrogen ions and oxygen ions. The hydrogen ions will pass through the electrified polymer solid electrolyte membrane to the outside of the cabinet, and a warning will be given. When the temperature of the frequency converter cabinet rises sharply to 60℃, the composite PCM material in the aluminum alloy PCM heat spreader melts and absorbs heat, thus reducing the temperature of the frequency converter cabinet.