Constant-temperature and constant-humidity marine frequency conversion cabinet
By introducing components such as semiconductor coolers, heat conduction plates, and desiccants into marine frequency converter cabinets, air circulation and heat exchange are achieved, solving the corrosion and short-circuit problems of marine frequency converter cabinets during sea voyages, achieving constant temperature and humidity, and extending the equipment lifespan.
Patent Information
- Application Number
- CN202423033140.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-10
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2034-12-10
AI Technical Summary
Marine frequency converters face high humidity and chloride pollution environments when sailing at sea, leading to risks of corrosion and short circuits, which are difficult to effectively solve with existing technologies.
The marine inverter cabinet adopts a constant temperature and humidity design. Through components such as semiconductor coolers, heat conduction plates, salt spray filters and desiccants, it realizes air circulation and heat exchange, filters chlorides, controls humidity, and avoids corrosion and short circuits.
It effectively reduces the ingress of chlorides, maintains constant temperature and humidity inside the cabinet, extends the structural life, avoids corrosion and short circuits, and ensures stable equipment operation.
Smart Images
Figure CN223844081U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power engineering technology, specifically to a constant temperature and humidity marine frequency converter cabinet. Background Technology
[0002] All types of motors used on board have energy-saving opportunities. Marine frequency converters can adjust the motor speed and torque according to process requirements. From main propulsion systems, side thrusters, winches, water pumps, and HVAC systems to deck cranes, marine frequency converters can use fuel more efficiently and reduce maintenance needs. They are key components of shaft-driven generators and the ship's DC power grid.
[0003] Compared to traditional frequency converters, marine frequency converters operate in harsher environments, especially on ships at sea. They not only face dust pollution but also high humidity. Sea breezes contain chlorides, which can easily enter the frequency converter during ventilation and heat dissipation. Chlorides entering the converter can exacerbate structural corrosion, leading to frequent short circuits and increasing fire hazards. Moisture ingress can also contribute to short circuits. Utility Model Content
[0004] Therefore, the purpose of this utility model is to provide a constant temperature and humidity marine frequency converter cabinet to solve the technical problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a constant temperature and humidity marine frequency converter cabinet, comprising a cabinet body, a dustproof net, and a salt spray filter. An exchange chamber is connected to one side of the cabinet body, and a semiconductor cooler is installed inside the exchange chamber. A first heat-conducting plate is connected to one side of the semiconductor cooler, and a second heat-conducting plate is connected to the other side of the semiconductor cooler via a protective plate. A motor is installed at the back of the exchange chamber, and a drive shaft is connected to the motor output end. A housing is connected to the top of the drive shaft, and a transmission groove is formed in the middle of the back of the housing. A desiccant is placed inside the housing, and a filter screen is installed at the bottom of the housing. A cover is connected to the outer surface of the housing, and a bolt penetrates the outer surface of the cover. A limit strip is connected to the lower part of the outer surface of the exchange chamber via a damping shaft.
[0006] By adopting the above technical solution, the left side of the exchange chamber achieves internal air circulation with the cabinet, while the right side achieves external air circulation with the outside. When the external airflow enters the exchange chamber, it passes through a salt spray filter to remove fine dust, moisture, and chlorides from the air, reducing the amount of chlorides entering the exchange chamber and thus improving the service life of the internal structure. Simultaneously, the protective plate prevents chlorides from contacting the thermoelectric cooler and causing corrosion. Furthermore, the cabinet uses internal airflow for heat dissipation or heating, preventing external chlorides from entering and causing corrosion. As the internal and external airflows circulate within the exchange chamber, the thermoelectric cooler heats or cools the first heat-conducting plate. The internal and external airflows exchange heat, causing the internal air to heat up or cool down, thus raising or lowering the temperature inside the cabinet to achieve a constant temperature effect. When the humidity inside the cabinet increases, the motor drives the casing to rotate half a turn, allowing the internal airflow to pass through the filter and enter the casing to contact the desiccant. The desiccant reduces the humidity of the internal airflow, thereby lowering the humidity inside the cabinet. When the relative humidity inside the cabinet reaches normal, the motor drives the casing to rotate half a turn again, preventing the internal airflow from entering the casing to contact the desiccant. This avoids the desiccant continuing to absorb moisture, which can lead to low humidity inside the cabinet and the generation of static electricity, thus achieving a constant humidity effect.
[0007] Furthermore, multiple first heat-conducting plates and multiple second heat-conducting plates are provided, and the multiple first heat-conducting plates and multiple second heat-conducting plates are distributed at equal intervals.
[0008] By adopting the above technical solution, the first heat-conducting plate is heated or cooled by a semiconductor cooler, and the second heat-conducting plate of the protective plate dissipates heat, allowing the internal and external circulating air to exchange heat, thereby raising or lowering the temperature of the internal circulating air, so as to raise or lower the temperature inside the cabinet and achieve a constant temperature effect.
[0009] Furthermore, the first heat-conducting plate, the protective plate, and the second heat-conducting plate are all made of aluminum alloy.
[0010] By adopting the above technical solution, the first heat-conducting plate, the protective plate, and the second heat-conducting plate of aluminum alloy have good thermal conductivity, which facilitates heat transfer. At the same time, the aluminum alloy protective plate avoids corrosion caused by contact between chlorides and the semiconductor cooler.
[0011] Furthermore, the housing is rotatably connected to the exchange chamber, and the filter screen is semi-circular.
[0012] By adopting the above technical solution, the motor drives the housing to rotate half a turn, so that the filter screen faces upward, allowing the internal circulating airflow to pass through the filter screen and enter the housing to contact the desiccant. Then, the desiccant reduces the humidity of the internal circulating airflow, thereby reducing the humidity inside the cabinet. At the same time, the filter screen blocks the desiccant, preventing the airflow from blowing the desiccant away.
[0013] Furthermore, both the drive shaft and the drive groove have a "convex" cross-section, and the housing is detachably connected to the drive shaft through the drive groove.
[0014] By adopting the above technical solution, since the cross-sections of the drive shaft and the drive groove are both convex, it is convenient to transmit torque so that the motor can drive the housing to rotate. Secondly, it plays a foolproof role to ensure that the installation angle of the housing is correct and avoids affecting the dehumidification work.
[0015] Furthermore, the cover is detachably connected to the housing by bolts.
[0016] By adopting the above technical solution, the staff can remove the bolts and then disassemble the cover, at which point the staff can replace the desiccant; after the desiccant is replaced, the staff can put the cover and bolts back on and tighten the bolts, and then put the shell and cover back into the exchange chamber.
[0017] Furthermore, the limiting strip is rotatably connected to the housing via a damping shaft, and the limiting strip abuts against the cover.
[0018] By adopting the above technical solution, the staff forcefully rotates the limiting strip downwards to make the limiting strip abut against the cover, preventing the shell and cover from sliding out of the exchange chamber, and the damping shaft prevents the limiting strip from rotating arbitrarily.
[0019] Furthermore, a sealed cabinet door is connected to the outer surface of the cabinet, a first fan, a temperature sensor, and a humidity sensor are respectively installed on one side of the inside of the exchange compartment, and a second fan is installed on the other side of the inside of the exchange compartment.
[0020] By adopting the above technical solution, the sealed cabinet door on the surface of the cabinet prevents the exchange of outside air with the air inside the cabinet, thereby preventing chloride and moisture from entering. When the frequency converter cabinet is working, the first fan and the second fan start. After the first fan starts, the left side of the exchange compartment achieves internal air circulation with the cabinet. After the second fan starts, the right side of the exchange compartment achieves external air circulation with the outside. The temperature of the internal air circulation air is detected by a temperature sensor, and the relative humidity of the internal air circulation air is detected by a humidity sensor.
[0021] Furthermore, the exchange chamber is fixed with a bracket on the upper side and the lower side of the same side, and the inside of the bracket is connected with a sealing gasket on both sides. The salt spray filter is located in the middle of the inside of the bracket, and the dustproof net is installed on one side of the bracket.
[0022] By adopting the above technical solution, when the external circulating airflow enters the exchange chamber, it first passes through the dust screen to filter out large particulate impurities, and then passes through the salt spray filter to filter out fine dust, moisture and chlorides in the air. When the salt spray filter is clogged, the staff can directly pull the salt spray filter out of the rack.
[0023] Furthermore, the salt spray filter is detachably connected to the insert, and the salt spray filter abuts against two sealing gaskets.
[0024] By adopting the above technical solution, when the salt spray filter is clogged, the staff can directly pull the salt spray filter out of the holder. Then, the staff can insert a new salt spray filter into the holder to complete the assembly operation. At the same time, the gaps between the salt spray filter and the holder are filled with sealing gaskets to prevent unfiltered external airflow from entering the exchange chamber directly through the gaps between the salt spray filter and the holder.
[0025] In summary, the present invention has the following main advantages:
[0026] 1. This utility model, through the arrangement of an exchange chamber, a semiconductor cooler, a first heat-conducting plate, a protective plate, a second heat-conducting plate, and a salt spray filter, achieves internal air circulation between the left side of the exchange chamber and the cabinet, and external air circulation between the right side of the exchange chamber and the outside. When the external airflow enters the exchange chamber, it passes through the salt spray filter to filter out fine dust, moisture, and chlorides in the air, reducing the amount of chlorides entering the exchange chamber and thus improving the service life of the internal structure of the exchange chamber. At the same time, the protective plate prevents chlorides from contacting the semiconductor cooler and causing corrosion. The cabinet uses internal airflow for heat dissipation or heating, preventing external chlorides from entering and causing corrosion. When the internal and external airflows circulate in the exchange chamber, the semiconductor cooler heats or cools the first heat-conducting plate, allowing the internal and external airflows to exchange heat, thereby raising or lowering the temperature of the internal airflow and raising or lowering the temperature inside the cabinet to achieve a constant temperature effect. This prevents hydrogen chloride from entering and causing structural corrosion, and avoids negative impacts on internal components and circuits caused by excessively high or low temperatures.
[0027] 2. This utility model, through the arrangement of a motor, housing, desiccant, and filter, allows the housing to rotate half a turn when the humidity inside the cabinet increases. This enables the internal circulating airflow to pass through the filter and enter the housing to contact the desiccant, thereby reducing the humidity of the internal circulating airflow and thus lowering the humidity inside the cabinet. When the relative humidity inside the cabinet reaches normal levels, the motor drives the housing to rotate half a turn again, preventing the internal circulating airflow from entering the housing and contacting the desiccant. This avoids the desiccant from continuing to absorb moisture, which could lead to low humidity inside the cabinet and the generation of static electricity, thus achieving a constant humidity effect. It also prevents excessively high or low humidity from negatively impacting internal components and circuitry. Attached Figure Description
[0028] Figure 1 This is a schematic diagram of the structure of this utility model;
[0029] Figure 2 This is a schematic cross-sectional view of the exchange chamber of this utility model;
[0030] Figure 3For the present utility model Figure 2 Enlarged view of the structure at point A in the image;
[0031] Figure 4 This is a side sectional view of the exchange compartment of this utility model;
[0032] Figure 5 For the present utility model Figure 4 Enlarged view of the structure at point B in the image;
[0033] Figure 6 This is a schematic diagram of the exploded shell structure of this utility model.
[0034] In the diagram: 1. Cabinet; 2. Sealed cabinet door; 3. Exchange compartment; 4. Semiconductor cooler; 5. First heat conduction plate; 6. Protective plate; 7. Second heat conduction plate; 8. First fan; 9. Second fan; 10. Dustproof net; 11. Salt spray filter; 12. Temperature sensor; 13. Humidity sensor; 14. Motor; 15. Drive shaft; 16. Housing; 17. Transmission groove; 18. Desiccant; 19. Filter screen; 20. Cover; 21. Bolt; 22. Damping shaft; 23. Limiting strip; 24. Insert bracket; 25. Sealing gasket. Detailed Implementation
[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.
[0036] The embodiments of this utility model will be described below based on its overall structure.
[0037] Example 1:
[0038] A type of marine frequency converter cabinet with constant temperature and humidity, such as Figures 1-6As shown, the system includes a cabinet 1, a dust filter 10, and a salt spray filter 11. The dust filter 10 first filters out large particles of impurities, and then the salt spray filter 11 filters out fine dust, moisture, and chlorides from the air, reducing the amount of chlorides entering the exchange chamber 3 and thus improving the service life of the structure inside the exchange chamber 3. One side of the cabinet 1 is connected to the exchange chamber 3, which houses a semiconductor cooler 4. One side of the semiconductor cooler 4 is connected to a first heat-conducting plate 5, and the other side of the semiconductor cooler 4 is connected to a second heat-conducting plate 7 via a protective plate 6. Both the first heat-conducting plate 5 and the second heat-conducting plate 7 are equipped with… There are multiple first heat-conducting plates 5 and second heat-conducting plates 7, which are equidistantly distributed. The first heat-conducting plates 5 are heated or cooled by the semiconductor cooler 4, and the second heat-conducting plates 7 are cooled by the protective plate 6. This allows the internal and external air circulation to exchange heat, thereby raising or lowering the temperature of the internal air circulation, so as to raise or lower the temperature inside the cabinet 1 and achieve a constant temperature effect. The first heat-conducting plates 5, the protective plate 6 and the second heat-conducting plates 7 are all made of aluminum alloy. The protective plate 6 is designed to prevent chloride from contacting the semiconductor cooler 4 and causing corrosion. Aluminum alloy is both corrosion-resistant and has good thermal conductivity.
[0039] A motor 14 is installed on the back of the exchange chamber 3. The output end of the motor 14 is connected to a drive shaft 15. A housing 16 is connected to the top of the drive shaft 15. A transmission groove 17 is formed in the middle of the back of the housing 16. Both the drive shaft 15 and the transmission groove 17 have a convex cross-section. The housing 16 is detachably connected to the drive shaft 15 via the transmission groove 17. The convex cross-sections of the drive shaft 15 and the transmission groove 17 serve two purposes: firstly, they facilitate torque transmission, allowing the motor 14 to drive the housing 16 to rotate; secondly, they act as a foolproof mechanism, ensuring the correct installation angle of the housing 16 and preventing interference with dehumidification operations. A cover 20 is connected to the outer surface of the body 16. A bolt 21 passes through the upper part of the outer surface of the cover 20. The cover 20 is detachably connected to the body 16 through the bolt 21. A limit strip 23 is connected to the lower part of the outer surface of the exchange chamber 3 through a damping shaft 22. The limit strip 23 is rotatably connected to the body 16 through the damping shaft 22. The limit strip 23 abuts against the cover 20. When the operator rotates the limit strip 23 downwards, the limit strip 23 abuts against the cover 20, preventing the body 16 and the cover 20 from sliding out of the exchange chamber 3. The damping shaft 22 also prevents the limit strip 23 from rotating freely.
[0040] A desiccant 18 is placed inside the housing 16, and a filter screen 19 is installed at the bottom of the housing 16. The housing 16 is rotatably connected to the exchange chamber 3. The filter screen 19 is semi-circular. The motor 14 drives the housing 16 to rotate half a turn so that the filter screen 19 faces upward, so that the internal circulating airflow can pass through the filter screen 19 and enter the housing 16 to contact the desiccant 18. Then, the humidity of the internal circulating airflow is reduced by the desiccant 18, thereby reducing the humidity inside the cabinet 1. At the same time, the filter screen 19 blocks the desiccant 18 to prevent the airflow from blowing the desiccant 18 away.
[0041] See Figure 1 and Figure 2 In the above embodiment, a sealed cabinet door 2 is connected to the outer surface of the cabinet 1. The sealed cabinet door 2 on the surface of the cabinet 1 prevents the exchange of outside air with the air inside the cabinet 1, thereby preventing chloride and moisture from entering. A first fan 8, a temperature sensor 12, and a humidity sensor 13 are respectively installed on one side of the inside of the exchange chamber 3. The temperature sensor 12 detects the temperature of the internal circulating airflow, and the humidity sensor 13 detects the relative humidity of the internal circulating airflow. A second fan 9 is installed on the other side of the inside of the exchange chamber 3. When the first fan 8 and the second fan 9 are started, the left side of the exchange chamber 3 achieves internal air circulation with the cabinet 1, and the right side of the exchange chamber 3 achieves external air circulation with the outside.
[0042] Example 2:
[0043] Based on the above embodiment 1, the following settings are made to facilitate the replacement of the salt spray filter 11.
[0044] See Figures 1-3 In the above embodiment, a bracket 24 is fixed on the upper side and the lower side of one side of the exchange chamber 3. Sealing gaskets 25 are connected to both sides inside the bracket 24. The salt spray filter 11 is located in the middle inside the bracket 24. The salt spray filter 11 is detachably connected to the bracket 24. The salt spray filter 11 abuts against the two sealing gaskets 25. The dustproof net 10 is installed on one side of the bracket 24. When the salt spray filter 11 is blocked, the operator can directly pull the salt spray filter 11 out of the bracket 24. Then, the operator inserts a new salt spray filter 11 into the bracket 24 to complete the assembly operation. At the same time, the sealing gaskets 25 fill the gaps between the sides of the salt spray filter 11 and the bracket 24 to prevent unfiltered external airflow from directly entering the exchange chamber 3 through the gaps between the sides of the salt spray filter 11 and the bracket 24.
[0045] The implementation principle of this utility model is as follows: First, the sealed cabinet door 2 on the surface of the cabinet 1 prevents the exchange of outside air with the air inside the cabinet 1, thereby preventing chloride and moisture from entering. When the frequency converter cabinet is working, the first fan 8 and the second fan 9 are started. After the first fan 8 is started, the left side of the exchange chamber 3 achieves internal air circulation with the cabinet 1. After the second fan 9 is started, the right side of the exchange chamber 3 achieves external air circulation with the outside. When the internal and external circulating air flows in the exchange chamber 3, the temperature of the internal circulating air is detected by the temperature sensor 12. Then, the first heat conduction plate 5 is heated or cooled by the semiconductor cooler 4, and the heat is dissipated by the second heat conduction plate 7 through the protective plate 6, so that the internal and external circulating air exchange heat, thereby raising or lowering the temperature of the internal circulating air, so that the temperature inside the cabinet 1 rises or falls, and a constant temperature effect is achieved.
[0046] Simultaneously, the relative humidity of the internal circulating airflow is detected by the humidity sensor 13. When the cabinet 1 is under maintenance and external moisture enters, causing the humidity inside the cabinet 1 to rise, the motor 14 drives the housing 16 to rotate half a turn, so that the filter screen 19 faces upward, allowing the internal circulating airflow to pass through the filter screen 19 and enter the housing 16 to contact the desiccant 18. Then, the desiccant 18 reduces the humidity of the internal circulating airflow, thereby reducing the humidity inside the cabinet 1. At the same time, the filter screen 19 blocks the desiccant 18, preventing the airflow from blowing it away. When the relative humidity inside the cabinet 1 reaches normal, the motor 14 drives the housing 16 to rotate half a turn again, so that the filter screen 19 faces downward, preventing the internal circulating airflow from entering the housing 16 to contact the desiccant 18. This prevents the desiccant 18 from continuing to absorb moisture, which would cause the humidity inside the cabinet 1 to be too low and easily generate static electricity. The sealed door is closed, preventing the outside air from exchanging with the air inside the cabinet 1 and continuing to raise or lower the humidity, thus achieving a constant humidity effect.
[0047] When the external circulating airflow enters the exchange chamber 3, it first passes through the dust filter 10 to filter out large particles of impurities, and then passes through the salt spray filter 11 to filter out fine dust, moisture and chlorides in the air, reducing the amount of chlorides entering the exchange chamber 3, thereby improving the service life of the internal structure of the exchange chamber 3. At the same time, the protective plate 6 prevents chlorides from contacting the semiconductor cooler 4 and causing corrosion. In addition, the cabinet 1 uses internal circulating airflow for heat dissipation or heating, preventing external chlorides from entering and causing corrosion.
[0048] When the salt spray filter 11 is clogged, the staff can directly pull the salt spray filter 11 out of the insert 24. Then, the staff can insert a new salt spray filter 11 into the insert 24 to complete the assembly operation. At the same time, the sealing gasket 25 fills the gap between the two sides of the salt spray filter 11 and the insert 24 to prevent unfiltered airflow from entering the exchange chamber 3 directly from the gap between the two sides of the salt spray filter 11 and the insert 24.
[0049] Once the desiccant 18 is fully saturated, the operator forcefully rotates the limiting strip 23 upwards to stop the cap 20 and housing 16 from being restricted. The operator can then remove the cap 20 and housing 16 from the exchange chamber 3. Afterwards, the operator removes the bolt 21 and disassembles the cap 20, allowing the desiccant 18 to be replaced. After replacing the desiccant 18, the operator reinstalls the cap 20 and bolt 21 and tightens the bolt 21. The operator then places the housing 16 and cap 20 back into the exchange chamber 3. Since the drive shaft 15 and drive groove 17 both have a convex cross-section, this facilitates torque transmission so that the motor 14 can drive the housing 16 to rotate. It also serves as a foolproof mechanism to ensure the correct installation angle of the housing 16, preventing interference with dehumidification. The operator then forcefully rotates the limiting strip 23 downwards to press against the cap 20, preventing the housing 16 and cap 20 from sliding out of the exchange chamber 3. The damping shaft 22 also prevents the limiting strip 23 from rotating arbitrarily.
[0050] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.
Claims
1. A constant temperature and humidity marine frequency converter cabinet, comprising a cabinet body (1), a dustproof net (10), and a salt spray filter (11), characterized in that: The cabinet (1) is connected to an exchange chamber (3) on one side, and a semiconductor cooler (4) is installed inside the exchange chamber (3). A first heat-conducting plate (5) is connected to one side of the semiconductor cooler (4), and a second heat-conducting plate (7) is connected to the other side of the semiconductor cooler (4) through a protective plate (6). A motor (14) is installed on the back of the exchange chamber (3), and a drive shaft (15) is connected to the output end of the motor (14). A housing (16) is connected to the top of the drive shaft (15), and a transmission groove (17) is opened in the middle of the back of the housing (16). A desiccant (18) is placed inside the housing (16), and a filter screen (19) is installed at the bottom of the housing (16). A cover (20) is connected to the outer surface of the housing (16), and a bolt (21) passes through the upper part of the outer surface of the cover (20). A limit strip (23) is connected to the lower part of the outer surface of the exchange chamber (3) through a damping shaft (22).
2. The marine frequency converter cabinet with constant temperature and humidity according to claim 1, characterized in that: Multiple first heat-conducting plates (5) and multiple second heat-conducting plates (7) are provided, and the multiple first heat-conducting plates (5) and multiple second heat-conducting plates (7) are distributed at equal intervals.
3. The marine frequency converter cabinet with constant temperature and humidity according to claim 2, characterized in that: The first heat-conducting plate (5), the protective plate (6), and the second heat-conducting plate (7) are all made of aluminum alloy.
4. The marine frequency converter cabinet with constant temperature and humidity according to claim 1, characterized in that: The housing (16) is rotatably connected to the exchange chamber (3), and the filter screen (19) is semi-circular.
5. The marine frequency converter cabinet with constant temperature and humidity according to claim 4, characterized in that: The cross-sections of the drive shaft (15) and the drive groove (17) are both convex, and the housing (16) is detachably connected to the drive shaft (15) through the drive groove (17).
6. The marine frequency converter cabinet with constant temperature and humidity according to claim 5, characterized in that: The cover (20) is detachably connected to the housing (16) by bolts (21).
7. The marine frequency converter cabinet with constant temperature and humidity according to claim 6, characterized in that: The limiting strip (23) is rotatably connected to the housing (16) via a damping shaft (22), and the limiting strip (23) abuts against the cover (20).
8. The marine frequency converter cabinet with constant temperature and humidity according to claim 1, characterized in that: The outer surface of the cabinet (1) is connected to a sealed cabinet door (2). The first fan (8), temperature sensor (12) and humidity sensor (13) are respectively installed on one side of the inside of the exchange chamber (3). The second fan (9) is installed on the other side of the inside of the exchange chamber (3).
9. The marine frequency converter cabinet with constant temperature and humidity according to claim 1, characterized in that: The exchange chamber (3) is fixed with a bracket (24) on one side above and one side below, and the inside of the bracket (24) is connected with a sealing gasket (25) on both sides. The salt spray filter (11) is located in the middle inside the bracket (24), and the dustproof net (10) is installed on one side of the bracket (24).
10. The marine frequency converter cabinet with constant temperature and humidity according to claim 9, characterized in that: The salt spray filter (11) is detachably connected to the bracket (24), and the salt spray filter (11) abuts against the two sealing gaskets (25).