Ship and offshore heat pump fresh air dehumidifier

Abstract

The application provides a ship and offshore heat pump type fresh air dehumidifier, an outer coil assembly is installed in an upper space; a lower space forms an inner coil installation box, an inner coil assembly is installed in the inner coil installation box, and an end surface of the inner coil installation box is provided with an air inlet grille communicated to the outside; a supply air fan is installed in the lower space, an air inlet of the supply air fan is communicated with an end surface of the inner coil installation box away from the air inlet grille; a compression separation assembly is installed in the lower space, the compression separation assembly is communicated with heat exchange pipes of the outer coil assembly and the inner coil assembly, and the number of the compression separation assembly, the outer coil assembly and the inner coil assembly is equal and is correspondingly arranged. The outer coil assembly is arranged in the upper part, and the inner coil assembly and the compression separation assembly are arranged in the lower part, space separation of a heat source and a cold source is realized, heat generated by the outer coil assembly is discharged upward, downward diffusion of hot air is avoided, heat exchange efficiency of the inner coil assembly is affected, and dehumidification performance and energy efficiency ratio of the whole machine are improved.

Description

Technical Field

[0001] This invention relates to a heat pump type fresh air dehumidifier for ships and marine engineering. Background Technology

[0002] With the introduction of dual-carbon targets, green ships have become an important development direction for my country's shipbuilding industry, and more and more low-carbon and energy-saving technologies are being applied in the shipbuilding and marine engineering fields. As a key device for ship cabin ventilation, equipment moisture protection, and temperature and humidity control of the operating environment of marine engineering platforms, the energy consumption level and operational reliability of fresh air dehumidifiers directly affect the economy and safety of ships and marine engineering facilities.

[0003] Existing heat pump-type dehumidifiers typically have a loose internal structure, with components mostly installed flat at the bottom of the casing, resulting in a large footprint and low space utilization. For high-volume dehumidifiers used in marine and offshore engineering projects that require multiple independent cooling systems, this flat layout leads to a bulky casing or a cramped internal layout, hindering orderly piping arrangement and future maintenance. Furthermore, the lack of a reasonable three-dimensional layered arrangement of core components such as the compressor, four-way reversing valve, and gas-liquid separator within the casing results in messy and interfering piping connections, increasing the risk of pipe vibration and stress concentration, and also raising the difficulty of installation and maintenance.

[0004] Furthermore, the external heat exchangers of existing marine and offshore dehumidifiers are mostly flat-plate designs, which are large in size and have poor duct sealing. Condensate easily accumulates on the surface of the heat exchanger, leading to corrosion and decreased heat exchange efficiency over long-term use. Meanwhile, the compressor exhaust pipes often use the shortest path for direct connection, lacking effective vibration damping and thermal compensation structures. Under the continuous vibration of the marine and offshore environment, the pipe welds are prone to cracking and the joints to loosen, increasing the risk of refrigerant leakage.

[0005] In summary, there is an urgent need to propose a year-round universal heat pump dehumidification solution that is compact in structure, has high space utilization, excellent heat exchange efficiency, and reliable pipeline connection in the field of fresh air dehumidification for ships and marine engineering. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the defects of the existing ship and marine engineering fresh air dehumidifiers, such as loose structure layout, low space utilization and poor heat exchange efficiency, and to provide a heat pump type fresh air dehumidifier for ships and marine engineering.

[0007] The present invention solves the above-mentioned technical problems through the following technical solutions: This invention provides a heat pump type fresh air dehumidifier for ships and marine engineering, including a main frame, at least one set of external coil assemblies, at least one set of internal coil assemblies, a blower, and at least one set of compression and separation assemblies. A transversely arranged support beam is provided within the main frame, dividing the internal space of the main frame into an upper space and a lower space, with the upper space located above the lower space. The external coil assemblies are installed in the upper space. The lower space forms an internal coil mounting box, in which the internal coil assemblies are installed. The end face of the internal coil mounting box has an air inlet grille connecting to the outside. The blower is installed in the lower space, and its air inlet is connected to the end face of the internal coil mounting box away from the air inlet grille. The compression and separation assemblies are installed in the lower space and are connected to the heat exchange tubes of the external and internal coil assemblies. The number of compression and separation assemblies, external coil assemblies, and internal coil assemblies are equal and correspondingly arranged.

[0008] In this technical solution, the internal space of the main frame is isolated into upper and lower spaces by transverse support beams. The external coil assembly is located in the upper space, while the internal coil assembly and the compression-separation assembly are located in the lower space, achieving spatial separation of the heat source and cold source. The heat generated by the external coil assembly is discharged upwards, preventing heat from diffusing downwards and affecting the heat exchange efficiency of the internal coil assembly, effectively reducing thermal interference and improving the overall dehumidification performance and energy efficiency ratio of the unit. Simultaneously, this layered structure allows for the side-by-side arrangement of multiple independent heat pump loop systems within a limited overall unit footprint, meeting the high fresh air volume and multi-system requirements of marine and offshore engineering applications. The equal number and corresponding arrangement of the compression-separation assembly, external coil assembly, and internal coil assembly ensure that each heat pump loop is an independent system, allowing for flexible start-up and shutdown of some loops according to the actual dehumidification load, achieving graded adjustment and energy-saving operation.

[0009] Preferably, the compression-separation assembly includes a compressor, a four-way reversing valve, and a gas-liquid separator. The compressor's suction port is connected to the gas-liquid separator's outlet port, the gas-liquid separator's inlet port is connected to the four-way reversing valve's low-pressure outlet, the compressor's discharge port is connected to the four-way reversing valve's high-pressure inlet, the four-way reversing valve's outer coil interface is connected to the outer coil assembly's heat exchange tube, and the four-way reversing valve's inner coil interface is connected to the inner coil assembly's heat exchange tube. The operation of the four-way reversing valve allows switching between cooling and heating modes. In cooling mode, the high-pressure inlet is connected to the outer coil interface, and the low-pressure outlet is connected to the inner coil interface. In heating mode, the high-pressure inlet is connected to the inner coil interface, and the low-pressure outlet is connected to the outer coil interface.

[0010] In this technical solution, a four-way reversing valve enables flexible switching between cooling and heating modes. In cooling / dehumidifying mode, high-temperature, high-pressure gaseous refrigerant first enters the outer coil assembly to dissipate heat to the external environment. After condensing into a liquid state, it enters the inner coil assembly through throttling to evaporate and absorb heat, thus cooling and dehumidifying the fresh air. In heating mode, high-temperature, high-pressure gaseous refrigerant first enters the inner coil assembly to release heat to the fresh air, thus heating and supplying air. A single system can meet the dehumidification, cooling, and heating needs of ships and marine engineering in different seasons, eliminating the need for additional electric heating equipment and significantly reducing operating energy consumption. The gas-liquid separator effectively prevents liquid refrigerant from entering the compressor suction port, avoiding liquid slugging damage to the compressor and improving the system's operational safety and reliability. It is especially suitable for the harsh operating conditions of ships and marine engineering during long-term continuous operation.

[0011] Preferably, the compression separation assembly further includes a mounting bracket, which includes at least one vertically arranged vertical support column and an upper support platform, a middle support platform, and a lower support platform fixed on the vertical support column, with the heights of the upper support platform, the middle support platform, and the lower support platform decreasing sequentially; the compressor is fixed on the lower support platform, the four-way reversing valve is fixed on the middle support platform, and the gas-liquid separator is fixed on the upper support platform.

[0012] In this technical solution, the compressor, four-way reversing valve, and gas-liquid separator are arranged vertically in layers on the same mounting bracket. This vertical stacking of the three components, which would otherwise require a large floor area, significantly saves horizontal installation space, allowing multiple compression and separation assemblies to be arranged side-by-side within a limited space. The top-light, bottom-heavy layout lowers the overall center of gravity, improving operational stability, and is particularly suitable for the stable operation requirements of ships and marine engineering facilities under dynamic conditions such as wind, waves, and tides. Simultaneously, it naturally isolates high-temperature and low-temperature components spatially, reducing mutual thermal radiation interference. The modular mounting bracket allows the entire compression and separation assembly to be pre-assembled and tested as a whole, improving production efficiency and assembly consistency.

[0013] Preferably, the compression separation assembly also includes an exhaust pipe, a four-way reversing valve located above the compressor, the high-pressure inlet of the four-way reversing valve being horizontally positioned, and the exhaust port of the compressor being horizontally positioned; both ends of the exhaust pipe are connected to the exhaust port of the compressor and the high-pressure inlet of the four-way reversing valve, respectively; the exhaust pipe is divided into a first horizontally extending section, a first vertically extending section downwards, a bottom curved section extending downwards and then upwards, a second vertically extending section upwards, and a second horizontally extending section, the port of the first horizontally extending section being connected to the exhaust port, and the port of the second horizontally extending section being connected to the high-pressure inlet.

[0014] In this technical solution, the bottom bend section of the exhaust pipe has a U-shaped structure. When the compressor vibrates, it can absorb vibration energy through elastic deformation, preventing the vibration from being directly transmitted to the four-way reversing valve. Simultaneously, when the exhaust pipe undergoes thermal expansion due to the flow of high-temperature refrigerant, the bottom bend section can compensate for this expansion through the deformation of the bend, effectively reducing thermal stress at pipe connections and preventing weld cracking or joint loosening. This is particularly important for ships and marine engineering equipment that are exposed to continuous vibration for extended periods. The first transverse section smoothly connects to the exhaust port, reducing local flow resistance; the first vertical section utilizes gravity to allow refrigerant oil to settle downwards; the second vertical section further facilitates the settling and return of residual oil droplets; and the second transverse section achieves stress-free installation and connection. The entire exhaust pipe integrates multiple functions, including vibration reduction, thermal compensation, oil return, and space avoidance.

[0015] Preferably, the bottom of the lower space also includes at least one mounting base, the mounting base including two horizontally arranged mounting base rods, the two mounting base rods being parallel to each other; a plurality of compression separation components are spaced apart along the extension direction of the mounting base rods, the bottom of the compression separation components being placed on the two mounting base rods and fixed together.

[0016] In this technical solution, the parallel double-beam structure of the mounting base provides a stable and regular mounting surface for multiple compression and separation components, and the gap between the two mounting base rods facilitates the passage of pipelines and wiring harnesses. Multiple compression and separation components are spaced apart along the extension direction of the mounting base rods, allowing for flexible increases or decreases in the number of components according to the overall capacity requirements, which is beneficial for serialized development and modular production. Each compression and separation component is independent of the others, ensuring no interference during maintenance, greatly improving the convenience of on-site maintenance in the compact cabin environment of ships and offshore engineering facilities.

[0017] Preferably, there are at least two sets of inner coil assemblies. The inner coil assemblies are placed vertically in the inner coil mounting box. Several inner coil assemblies are arranged in a row along the direction from the air inlet grille to the air inlet of the blower. The windward side of the inner coil assembly is set parallel to the air inlet grille, and the leeward side of the inner coil assembly is set opposite to the windward side of the adjacent inner coil assembly.

[0018] In this technical solution, multiple internal coil assemblies are arranged in a row along the airflow direction, with their windward surfaces parallel to the air inlet grille. This arrangement ensures that fresh air entering from the air inlet grille flows evenly across the heat exchange surfaces of each row of internal coil assemblies. Each row of internal coil assemblies is connected to its corresponding heat pump circuit, enabling multi-stage heat treatment, increasing the effective heat exchange area, and improving dehumidification efficiency. The leeward and windward surfaces of adjacent internal coil assemblies are positioned opposite each other, resulting in a smooth airflow transition between internal coil assemblies and reducing local eddies and flow resistance.

[0019] Preferably, the air supply fan is installed between the internal coil mounting box and the compression separation assembly.

[0020] In this technical solution, the air supply fan is positioned between the inner coil mounting box and the compression-separation assembly, in the middle of the airflow channel. Its air inlet is connected to the end of the inner coil mounting box furthest from the air inlet grille, used to draw in air processed by the inner coil assembly. Its air outlet connects to the compartment or air supply duct network, forcibly delivering the processed dry air to its destination, achieving directional delivery of fresh air. Simultaneously, this position avoids heat-generating components such as the compressor in the compression-separation assembly, preventing hot air short-circuiting and ensuring the stability of the supply air temperature.

[0021] Preferably, the fresh air dehumidifier also includes at least one set of throttling components, which are connected to the heat exchange tubes of the outer coil assembly and the inner coil assembly. The throttling components and the compression separation components are respectively connected to the two ends of the heat exchange tubes of the inner coil assembly. The number of throttling components is equal to that of the outer coil assembly and the inner coil assembly, and they are set accordingly.

[0022] In this technical solution, the throttling component reduces the pressure of the high-temperature, high-pressure liquid refrigerant to a low-temperature, low-pressure gas-liquid two-phase state, providing conditions for the refrigerant to evaporate and absorb heat in the inner coil assembly. The number of throttling components is equal to and corresponds one-to-one with the number of outer and inner coil assemblies, ensuring the independence and integrity of each heat pump circuit. This facilitates hierarchical control and redundancy backup, meeting the stringent requirements for high-reliability fresh air treatment in the marine and offshore engineering fields.

[0023] Preferably, the throttling assembly includes an expansion valve, a first filter, and a second filter. The first filter and the second filter are located at opposite ends of the expansion valve. The first filter connects the expansion valve to the heat exchange tube of the outer coil assembly, and the second filter connects the expansion valve to the heat exchange tube of the inner coil assembly.

[0024] In this technical solution, the expansion valve precisely throttles and reduces the pressure of the refrigerant, and the first and second filters filter the refrigerant entering and leaving the expansion valve respectively, effectively removing impurities and moisture from the pipeline, preventing blockage of the expansion valve and refrigeration system, and ensuring the purity of the refrigeration cycle under long-term continuous operation conditions in ships and marine engineering.

[0025] Preferably, the fresh air dehumidifier also includes at least one set of reheat pipe assembly, which is disposed between the external coil assembly and the throttling assembly. The reheat pipe assembly connects the heat exchange tube of the external coil assembly to the throttling assembly. The number of reheat pipe assemblies is equal to that of the external coil assembly and the throttling assembly, and they are disposed accordingly.

[0026] In this technical solution, the reheat pipeline assembly utilizes part of the heat from the high-temperature refrigerant in the external coil assembly to reheat the fresh air, achieving the dual functions of refrigerant subcooling and fresh air reheating. This not only improves the energy efficiency ratio of the refrigeration cycle but also heats the low-temperature air after it has been cooled and dehumidified by the internal coil assembly to a suitable supply air temperature, avoiding discomfort for personnel or condensation on equipment caused by excessively low supply air temperature in ship cabins, and achieving independent control of temperature and humidity.

[0027] Preferably, the reheat piping assembly includes a reheat coil, a reheat flow regulating valve, and a check valve. The heat exchange tubes of the reheat coil are connected to the heat exchange tubes and throttling assembly of the external coil assembly. The reheat flow regulating valve is located between the heat exchange tubes of the reheat coil and the heat exchange tubes of the external coil assembly. The check valve is located between the heat exchange tubes of the reheat coil and the throttling assembly.

[0028] In this technical solution, the reheat flow regulating valve can precisely control the amount of high-temperature refrigerant entering the reheat coil, thereby regulating the reheat amount and achieving precise control of the supply air temperature. The one-way valve ensures that the refrigerant flows in one direction in the reheat coil, preventing reverse flow and ensuring the stability and reliability of the system under different operating modes.

[0029] Preferably, the reheat piping assembly also includes a bypass piping that connects to the heat exchange tubes and throttling components of the external coil assembly, and the bypass piping is configured in parallel with the reheat coil.

[0030] In this technical solution, the bypass pipeline provides a flow path for the refrigerant to bypass the reheat coil. When reheating is not required (such as in a high-temperature and high-humidity environment in summer where only cooling and dehumidification are needed), the refrigerant can directly enter the throttling component through the bypass pipeline, avoiding unnecessary reheating and improving the system's energy efficiency and operational flexibility.

[0031] Preferably, the reheat piping assembly also includes a bypass flow regulating valve, which is located on the bypass piping.

[0032] In this technical solution, the bypass flow regulating valve can accurately control the refrigerant flow in the bypass pipeline. When used in conjunction with the reheat flow regulating valve, it can achieve continuous stepless regulation of reheat, further improving the accuracy of supply air temperature control and the system's adaptability to different marine climate conditions.

[0033] Preferably, the reheat coil is installed inside the inner coil mounting box, and the reheat coil is positioned between the inner coil assembly and the air inlet of the blower.

[0034] In this technical solution, the reheat coil is positioned between the inner coil assembly and the air inlet of the supply fan. This allows the low-temperature air, cooled and dehumidified by the inner coil assembly, to be heated by flowing through the reheat coil before entering the supply fan, and then being delivered by the supply fan. This arrangement ensures that the reheated air can be promptly delivered to the compartment by the supply fan, reducing heat loss. Furthermore, the reheat coil and the inner coil assembly share a single inner coil mounting box, resulting in a compact structure and saving installation space.

[0035] Preferably, the number of reheat piping assemblies is at least two sets, and the reheat coils of several reheat piping assemblies are integrated into one unit.

[0036] In this technical solution, the reheat coils of multiple reheat piping assemblies are integrated into one unit, reducing the gaps and redundant structures between the coils, resulting in higher space utilization and lower airflow resistance within the inner coil mounting box, while also simplifying the piping connection and installation process.

[0037] Preferably, the air supply fan is installed between the inner coil mounting box and the compression separation assembly, the throttling assembly is installed between the inner coil mounting box and the compression separation assembly, and the throttling assembly is installed on the side of the air supply fan.

[0038] In this technical solution, the throttling component is installed on the side of the air supply fan, making full use of the unused space on the side of the air supply fan and making the layout of the lower part of the unit more compact and reasonable. The throttling component is adjacent to the inner coil mounting box, which shortens the length of the heat exchange tube between the throttling component and the inner coil assembly, and reduces the flow resistance.

[0039] Preferably, the external coil assembly includes two external heat exchangers, a top sealing plate, two side sealing plates, and a heat exchange fan. The external heat exchangers are flat plate type, each including an upper edge, a lower edge, and two side edges. The lower edges of the two external heat exchangers are fixed together, while their upper edges are separate. The top sealing plate is horizontally positioned and rectangular. Its four edges consist of two opposing horizontal sealing edges and two opposing side sealing edges. The two horizontal sealing edges of the top sealing plate are fixed to the upper edges of the two external heat exchangers, respectively. The top sealing plate is vertically arranged, and two side sealing plates are located on both sides of the external heat exchanger. The side sealing plates are triangular, with a horizontally arranged upper sealing edge and two downwardly extending and intersecting oblique sealing edges on the three edges. The upper sealing edges of the two side sealing plates are fixed to the two side sealing edges of the top sealing plate. The two oblique sealing edges of the side sealing plates are fixed to the side edges of the two external heat exchangers. A heat exchange duct is formed between the two side sealing plates, the two external heat exchangers, and the top sealing plate. The heat exchange fan is located on the top sealing plate and connects the heat exchange duct to the external space.

[0040] In this technical solution, the lower edges of two flat-plate external heat exchangers are fixed while their upper edges are separated, forming a V-shaped structure with a triangular cross-section. This structure possesses excellent structural stability and can effectively withstand the vibrations during the operation of the heat exchange fan, meeting the stringent requirements of ships and marine engineering equipment for structural strength and vibration resistance. Two side sealing plates and a top sealing plate, together with the external heat exchangers, form a sealed heat exchange duct. The cross-sectional area of ​​this duct gradually increases from bottom to top, facilitating uniform airflow distribution and smooth discharge, reducing local eddies and flow resistance. The heat exchange fan, located at the top, forcibly extracts the hot air that has absorbed heat from the external heat exchangers within the heat exchange duct, creating a negative pressure. This guides external cold air to uniformly pass through the coil gaps from the windward side of the external heat exchanger, allowing for thorough heat exchange with the high-temperature, high-pressure refrigerant inside the tubes. This significantly improves heat exchange efficiency and is particularly suitable for installation environments where heat dissipation in ship and marine engineering equipment compartments is limited.

[0041] Preferably, the upper space forms at least one external coil mounting frame, and a set of external coil assemblies are installed in each external coil mounting frame; the external coil mounting frame is provided with an annular fixing frame, the external coil assembly is placed on a transverse support beam, and the transverse support beam is perpendicular to the lower edge of the external coil assembly; the annular fixing frame surrounds the top sealing plate, and the annular fixing frame is fixed to the outer peripheral surface of the top sealing plate.

[0042] In this technical solution, the transverse support beam bears the weight of the outer coil assembly, while the annular fixing frame positions and secures the top sealing plate, firmly installing the outer coil assembly within the upper space. This modular installation method allows the outer coil assembly to be assembled, tested, and maintained as an independent unit, facilitating production organization and after-sales maintenance. The perpendicular arrangement of the transverse support beam to the lower edge of the outer coil assembly further enhances the stability of the support.

[0043] Preferably, the upper space forms multiple external coil mounting frames, and each external coil mounting frame houses a set of external coil assemblies; the multiple external coil mounting frames are arranged horizontally in the transverse direction.

[0044] In this technical solution, multiple external coil assemblies operate in parallel, significantly increasing the overall heat dissipation capacity and meeting the needs of applications requiring greater dehumidification. Positioning the external coil mounting frame at the top of the main frame allows heat generated by the external heat exchanger to be expelled upwards, preventing downward heat diffusion that could affect the efficiency of other components such as the lower internal coil assemblies. This design is particularly suitable for applications with limited vertical space in ship and marine engineering equipment compartments and where strict requirements for heat flow organization are necessary. The horizontally arranged layout effectively utilizes the lateral space of the main frame, integrating multiple external coil assemblies within a limited height.

[0045] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0046] The positive and progressive effects of this invention are as follows: The aforementioned heat pump-type fresh air dehumidifier for ships and offshore engineering uses a transverse support beam to isolate the internal space of the main frame into upper and lower spaces. The external coil assembly is located in the upper part, while the internal coil assembly and compression separation assembly are located in the lower part. This achieves spatial separation of the heat source and the cold source. The heat generated by the external coil assembly is discharged upwards, preventing the downward diffusion of hot airflow from affecting the heat exchange efficiency of the internal coil assembly. This effectively reduces thermal interference and improves the overall dehumidification performance and energy efficiency ratio of the unit. Simultaneously, the layered structure allows for the horizontal arrangement of multiple independent heat pump loop systems within a limited footprint. This meets the needs of ships and offshore engineering applications with large fresh air volumes and multiple systems. Each loop group has an equal number of corresponding loops, allowing for flexible start-stop of some loops based on the dehumidification load. This enables tiered capacity adjustment and mutual redundancy backup, making it particularly suitable for installation environments with compact cabin spaces and strict limitations on floor space in ships and offshore engineering facilities. This significantly improves the overall space utilization, system integration, and operational reliability of the unit. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the structure of the heat pump type fresh air dehumidifier for ships and marine engineering of the present invention.

[0048] Figure 2 for Figure 1 The diagram shows another angle of the structure of the fresh air dehumidifier.

[0049] Figure 3 for Figure 1 The image shows a vertical sectional view of the fresh air dehumidifier.

[0050] Figure 4 for Figure 1 The image shows a cross-sectional view of the fresh air dehumidifier.

[0051] Figure 5 for Figure 1 The diagram shows the system principle of the fresh air dehumidifier.

[0052] Figure 6 for Figure 5 The diagram shown is a schematic of a single-loop system for a fresh air dehumidifier.

[0053] Figure 7 for Figure 3 The diagram shows the structure of the compression and separation component of the fresh air dehumidifier.

[0054] Figure 8 for Figure 7 The diagram shows another angle of the compression separation component.

[0055] Figure 9 for Figure 7 The diagram shows another angle of the compression separation component.

[0056] Figure 10 for Figure 3 The diagram shows the structure of the external coil assembly of the fresh air dehumidifier.

[0057] Figure 11 for Figure 10 The diagram shows another angle of the external coil assembly.

[0058] Figure 12 for Figure 10 The diagram shows a vertical cross-sectional view of the external coil assembly.

[0059] Figure 13 for Figure 12 A magnified view of area A of the external coil assembly shown.

[0060] Figure 14 for Figure 12 A magnified view of section B of the external coil assembly shown.

[0061] Figure 15 for Figure 10 The diagram shows a cross-sectional view of the external coil assembly.

[0062] Explanation of reference numerals in the attached figures Main frame 1; Upper space 11; Lower space 12; Transverse support beam 13; Inner coil mounting box 14; Air inlet grille 15; Outer coil mounting frame 16; Circular fixing frame 17; Mounting base 18; Mounting base rod 181; External coil assembly 2; External heat exchanger 21; Upper edge 211; Lower edge 212; Side edge 213; Limiting foot 214; Support foot 215; Rolled edge 216; Top sealing plate 22; Horizontal sealing edge 221; Side sealing edge 222; Central air hole 223; Side sealing plate 23; Upper sealing edge 231; Oblique sealing edge 232; Heat exchange fan 24; Fixing plate 241; Bottom connector 25; Support plate 251; Support base 252; Baffle 253; Drain hole 254; Heat exchange air duct 26; Water passage gap 27; Isolation gap 28; Inner coil assembly 3; 4 air supply fan; 41 air inlet; 42 air outlet; Compression separation assembly 5; compressor 51; exhaust port 511; intake port 512; four-way reversing valve 52; high-pressure inlet 521; low-pressure outlet 522; external coil interface 523; internal coil interface 524; gas-liquid separator 53; air inlet 531; air outlet 532; exhaust pipe 54; first transverse section 541; first vertical section 542; bottom curved section 543; second vertical section 544; second transverse section 545; mounting bracket 55; vertical support column 551; upper support Support platform 552; Upper fixed seat 5521; Adjusting shim 5522; Middle support platform 553; Horizontal fixed plate 5531; Vertical connecting plate 5532; Middle corner support plate 5533; Buffer support 5534; Support leg 5535; Horizontal support rod 5536; Drain hole 5537; Lower support platform 554; Lower base 5541; Lower corner support plate 5542; Clip 5543; First fixing component 555; Second fixing component 556; First air intake pipe 56; Second air intake pipe 57; Reheat piping assembly 6; reheat coil 61; reheat flow regulating valve 62; check valve 63; bypass piping 64; bypass flow regulating valve 65; Throttling assembly 7; expansion valve 71; first filter 72; second filter 73. Detailed Implementation

[0063] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0064] like Figures 1 to 6 The illustration shows an embodiment of the heat pump type fresh air dehumidifier for marine and offshore engineering applications according to the present invention. This heat pump type fresh air dehumidifier for marine and offshore engineering applications includes a main frame 1, four sets of external coil assemblies 2, four sets of internal coil assemblies 3, an air supply fan 4, and four sets of compression and separation assemblies 5. A transverse support beam 13 is provided within the main frame 1, dividing the internal space of the main frame 1 into an upper space 11 and a lower space 12. The upper space 11 is located above the lower space 12. The external coil assemblies 2 are installed within the upper space 11. The lower space 12 forms an internal coil mounting box 14, and the internal coil assemblies 3... The inner coil is installed inside the inner coil mounting box 14, and the end face of the inner coil mounting box 14 is provided with an air inlet grille 15 that connects to the outside. The air supply fan 4 is installed in the lower space 12, and the air inlet 41 of the air supply fan 4 is connected to the end face of the inner coil mounting box 14 away from the air inlet grille 15. The compression separation assembly 5 is installed in the lower space 12, and the compression separation assembly 5 is connected to the heat exchange tubes of the outer coil assembly 2 and the inner coil assembly 3. The number of compression separation assemblies 5, outer coil assemblies 2 and inner coil assemblies 3 are equal and they are set accordingly.

[0065] When the fresh air dehumidifier is running, the fresh air to be treated is introduced into the inner coil mounting box 14 through the air inlet grille 15 under the drive of the supply fan 4, and flows through each inner coil assembly 3 in sequence. The inner coil assembly 3 is used for heat exchange with the fresh air flowing over its surface, undertaking the heat exchange function of evaporation heat absorption or condensation heat release in different operating modes to achieve cooling and dehumidification or heating and temperature regulation of the fresh air. The outer coil assembly 2, as the outdoor heat exchanger, is arranged in the upper space 11 of the main frame 1. Its heat exchange tubes are connected to the heat exchange tubes of the compression separation assembly 5 and the inner coil assembly 3, undertaking the function of dissipating heat to the external environment or absorbing heat from the external environment in different modes. The compression separation assembly 5, as the power core of the refrigerant circulation, undertakes the functions of driving the refrigerant compression, switching the refrigerant flow direction, and performing gas-liquid separation of the returning refrigerant, providing a reliable guarantee for the whole unit to switch between cooling / dehumidification or heating operation in different seasonal modes. The air outlet 42 of the air supply fan 4 is connected to the cabin or the air supply duct network; the air that has been heated and humidified by the inner coil assembly 3 is drawn in by the air inlet 41 of the air supply fan 4 and sent out from the air outlet 42 to the cabin or the air supply duct network to complete the fresh air delivery.

[0066] In the above layout, by vertically separating the main heat source, the external coil assembly 2, and the internal coil assembly 3, which undertakes the indoor air handling function (upper and lower layer layout), on the one hand, it effectively blocks the heat radiation and hot air flow interference of the upper heat dissipation airflow to the lower components, avoids the mutual influence of the working temperature zones of the two, and improves the heat exchange efficiency of the external coil assembly 2 and the internal coil assembly 3; on the other hand, this layout makes the internal space of the equipment more clearly and rationally divided. The lower part can be centrally arranged with components such as the internal coil assembly 3, the air supply fan 4, and the compression separation assembly 5, while the upper part is dedicated to the heat dissipation and ventilation of the external coil assembly 2. This facilitates the horizontal side-by-side arrangement of multiple sets of external coil assemblies 2, enabling multiple systems to be connected in parallel within the limited equipment installation space of ships and marine engineering facilities, significantly improving the space utilization and system integration of the whole machine.

[0067] In this embodiment, there are four external coil assembly 2, four internal coil assembly 3, and four compression-separation assembly 5. These four independent heat pump circuit systems are arranged side-by-side laterally, enabling graded capacity adjustment and mutual redundancy. This significantly improves the overall dehumidification capacity and operational reliability, fully meeting the stringent requirements of the marine and offshore engineering sectors for high-volume, high-reliability fresh air treatment. In other embodiments, the number of these components can be adjusted according to the actual dehumidification load and air volume requirements, for example, by setting one, two, three, or more groups, not limited to the four disclosed in this embodiment. This flexible configuration allows the fresh air dehumidifier to adapt to the diverse needs of different scale application scenarios in the marine and offshore engineering sectors, exhibiting excellent serialization and expansion capabilities and wide applicability.

[0068] like Figures 7 to 9As shown, the compression-separation assembly 5 includes a compressor 51, a four-way reversing valve 52, and a gas-liquid separator 53. The suction port 512 of the compressor 51 is connected to the discharge port 532 of the gas-liquid separator 53. The inlet port 531 of the gas-liquid separator 53 is connected to the low-pressure outlet 522 of the four-way reversing valve 52. The discharge port 511 of the compressor 51 is connected to the high-pressure inlet 521 of the four-way reversing valve 52. The external coil interface 523 of the four-way reversing valve 52 is connected to the heat exchanger of the external coil assembly 2. The pipes are connected, and the inner coil interface 524 of the four-way reversing valve 52 is connected to the heat exchange tube of the inner coil assembly 3; the four-way reversing valve 52 can switch between cooling mode and heating mode; in cooling mode, the high pressure inlet 521 is connected to the outer coil interface 523, and the low pressure outlet 522 is connected to the inner coil interface 524; in heating mode, the high pressure inlet 521 is connected to the inner coil interface 524, and the low pressure outlet 522 is connected to the outer coil interface 523.

[0069] In actual operation, after compressor 51 starts, it discharges high-temperature, high-pressure gaseous refrigerant through its exhaust port 511 into four-way reversing valve 52. In cooling / dehumidification mode, four-way reversing valve 52 operates, connecting compressor 51's exhaust port 511 to the external coil interface 523 via the four-way reversing valve 52. The high-temperature, high-pressure gaseous refrigerant enters the external coil assembly 2 (as a condenser) located in the upper space 11, where it dissipates heat to the environment under the action of external cooling airflow, condensing into a high-pressure liquid state during this process. Subsequently, the high-pressure liquid refrigerant undergoes throttling and pressure reduction, becoming a low-temperature, low-pressure gas-liquid two-phase state, and enters the internal coil assembly 3 (as an evaporator) located in the lower space 12, where the low-temperature, low-pressure refrigerant evaporates and absorbs heat. Simultaneously, the blower 4 operates, drawing in the humid air to be treated through the air inlet 41 and passing it through the coil of the inner coil assembly 3. Water vapor in the air condenses on the low-temperature surface of the inner coil assembly 3, forming condensate that is then discharged. The air temperature decreases, humidity drops, and the air becomes dry and cold, finally being delivered through the air outlet 42 of the blower 4, achieving dehumidification and cooling. In heating mode, the four-way reversing valve 52 reverses its direction, connecting the compressor 51's exhaust port 511 to the inner coil interface 524 via the four-way reversing valve 52. High-temperature, high-pressure gaseous refrigerant first enters the inner coil assembly 3 (acting as a condenser), where it condenses and releases heat, heating the fresh air flowing through the inner coil assembly 3 and raising the supply air temperature for heating. After releasing heat, the refrigerant becomes a high-pressure liquid, which, after throttling and depressurization, enters the outer coil assembly 2 (acting as an evaporator). The low-temperature, low-pressure refrigerant evaporates and absorbs heat under the influence of external airflow, completing the heat pump cycle. This cooling / heating mode switching method based on the four-way reversing valve 52 allows the entire unit to flexibly adjust its operating mode according to environmental conditions and environmental control requirements throughout the entire operating cycle of the ship and marine engineering facilities, without the need for additional electric heating equipment, thus significantly reducing operating energy consumption.

[0070] like Figures 7 to 9 As shown, the compression separation assembly 5 also includes a mounting bracket 55, which includes two vertically arranged vertical support columns 551 and an upper support platform 552, a middle support platform 553 and a lower support platform 554 fixed on the vertical support columns 551. The heights of the upper support platform 552, the middle support platform 553 and the lower support platform 554 decrease sequentially. The compressor 51 is fixed on the lower support platform 554, the four-way reversing valve 52 is fixed on the middle support platform 553 and the gas-liquid separator 53 is fixed on the upper support platform 552.

[0071] The compressor 51, four-way reversing valve 52, and gas-liquid separator 53 are arranged vertically in layers on the same mounting bracket 55, achieving several beneficial effects. First, in terms of space utilization, this three-dimensional layout stacks the three components, which would otherwise require a large floor area to be laid flat, vertically, greatly saving horizontal installation space. This allows multiple compression and separation components 5 to be arranged side by side at the bottom of the limited space in the fresh air dehumidifier's casing, enabling multiple systems to be connected in parallel without significantly increasing the overall size of the unit. This is particularly suitable for installation environments where ship and marine engineering facilities have compact cabin spaces and strict limitations on equipment floor space. Second, in terms of piping layout, the vertical layering makes the connecting pipes between the components clear, avoiding pipes from tangling and crossing in the horizontal plane. This is beneficial for maintaining the orderliness of the piping system and the accessibility for maintenance in the high-vibration environment of ships and marine engineering. Furthermore, from the perspective of vibration and noise control, the heavier compressor 51 is placed at the bottom, while the lighter four-way reversing valve 52 and gas-liquid separator 53 are placed on top. This top-light, bottom-heavy layout helps lower the center of gravity of the entire unit and improves operational stability, which is especially suitable for the stable operation requirements of ships and marine engineering facilities under dynamic conditions such as wind, waves, and tides. In addition, the layered arrangement naturally isolates the high-temperature component (compressor 51) from the low-temperature component (gas-liquid separator 53) in space, reducing the mutual influence of heat radiation. Finally, the modular mounting bracket 55 allows the entire compression and separation assembly 5 to be pre-assembled and tested as a whole before being installed into the fresh air dehumidifier, greatly improving production efficiency and assembly consistency.

[0072] The lower surface of the middle support platform 553 is higher than the highest point of the compressor 51, and the lower surface of the upper support platform 552 is higher than the highest point of the four-way reversing valve 52. Firstly, sufficient operating clearance is provided between the lower component (compressor 51) and the upper component (middle support platform 553), allowing tools to be freely inserted during compressor 51 installation or maintenance. Wiring, oil changes, and other operations can be performed without removing the middle support platform 553, greatly improving the convenience of on-site maintenance within the limited space of ships and offshore engineering facilities. Secondly, this clearance also creates a good airflow channel for compressor 51 heat dissipation, preventing heat accumulation due to obstruction by the upper component, thereby reducing the operating temperature of the compressor 51 and extending its service life. Thirdly, with the lower surface of the middle support platform 553 higher than the highest point of the compressor 51, even if the compressor 51 experiences slight vibration or thermal expansion during operation, it will not collide with the upper middle support platform 553, ensuring operational safety. Similarly, the lower surface of the upper support platform 552 is higher than the highest point of the four-way reversing valve 52, providing the necessary space for the maintenance and heat dissipation of the four-way reversing valve 52, while also avoiding mutual interference between the gas-liquid separator 53 and the four-way reversing valve 52.

[0073] In this design, the vertical projections of the compressor 51, the four-way reversing valve 52, and the gas-liquid separator 53 do not overlap, with the four-way reversing valve 52 located between the compressor 51 and the gas-liquid separator 53. Firstly, this non-overlapping projection means that when viewed from above, the three components do not obstruct each other, and each connecting pipe can be directly connected to its corresponding interface from the side without bypassing other components. This significantly simplifies the piping layout, reduces unnecessary bends, and lowers refrigerant flow resistance. Secondly, in situations where maintenance personnel on ships and offshore engineering equipment have limited operating space, technicians can directly see the interface location of each component during maintenance, making pipe disassembly more intuitive and convenient. Furthermore, the four-way reversing valve 52's location between the compressor 51 and the gas-liquid separator 53 allows the compressor 51's exhaust pipe 54 to extend upwards to the four-way reversing valve 52, while the second suction pipe 57 can directly connect from the four-way reversing valve 52 to the gas-liquid separator 53 above. The overall piping layout is symmetrical and balanced, which helps reduce pipe vibration stress and enhances the system's long-term reliability in the continuous vibration environment of ships and offshore engineering.

[0074] like Figures 7 to 9As shown, the lower support platform 554 includes a lower base 5541 and lower corner braces 5542. The lower base 5541 is placed on and fixed to the main frame 1 of the fresh air dehumidifier. The lower end of the vertical support column 551 is fixed to the upper surface of the lower base 5541. The lower corner braces 5542 are arranged one-to-one with the vertical support columns 551. The lower surface of the lower corner braces 5542 is fixed to the upper surface of the lower base 5541, and the vertical side surface of the lower corner braces 5542 is fixed to the vertical surface of the vertical support column 551. The lower base 5541 serves as a connecting bridge between the entire component and the overall frame. Its planar structure facilitates positioning and welding or screwing, ensuring installation position accuracy. The lower corner braces 5542 form a triangular reinforcing structure between the vertical support column 551 and the lower base 5541, significantly enhancing the connection strength and bending stiffness, effectively resisting the overturning moment and vibration impact generated during the operation of the compressor 51, and ensuring the structural stability of the mounting bracket 55 under long-term dynamic loads in ships and marine engineering.

[0075] The lower support platform 554 also includes several clamping feet 5543, which surround the compressor 51. Each clamping foot 5543 has a contact surface that mates with the outer surface of the compressor 51's base. The clamping feet 5543 limit the position of the compressor 51's base from multiple directions, effectively preventing horizontal displacement of the compressor 51 during operation. The contact surface of the clamping feet 5543 is designed in an arc or V-shape to mate with the outer surface of the compressor 51's base, achieving a self-centering effect. Even if the compressor 51's base has certain manufacturing tolerances, it can be reliably clamped. Compared to single-point fixing, this multi-point surrounding constraint can disperse and absorb the horizontal vibration energy generated by the compressor 51 during operation, avoiding concentrated action on a single pipe joint, thereby significantly reducing the risk of pipe leakage in the continuous vibration environment of ships and marine engineering. Furthermore, the clamping feet 5543 also play a shock-absorbing role, further reducing the vibration energy transmitted from the compressor 51 to the mounting bracket 55 through elastic contact or the addition of rubber gaskets.

[0076] like Figures 7 to 9As shown, the central support platform 553 includes a horizontal fixing plate 5531, a vertical connecting plate 5532, and two central corner braces 5533. The horizontal fixing plate 5531 is horizontally positioned, and the four-way reversing valve 52 is fixed to the horizontal fixing plate 5531. The vertical connecting plate 5532 is perpendicular to the horizontal fixing plate 5531, and the vertical outer surface of the vertical connecting plate 5532 away from the horizontal fixing plate 5531 is attached to the vertical surface of the vertical support column 551. The upper surface of the central corner braces 5533 is fixed to the lower surface of the horizontal fixing plate 5531, and the vertical side surface of the central corner braces 5533 is fixed to the vertical inner surface of the vertical connecting plate 5532 facing the horizontal fixing plate 5531. The large-area contact of the vertical connecting plate 5532 ensures the reliability of the connection. Compared with point contact or line contact, this surface contact can withstand greater bending moment and torque, avoiding loosening of the connecting bolts due to vibration in the ship and marine environment. The central angle support plate 5533 forms a triangular support structure between the horizontal fixing plate 5531 and the vertical connecting plate 5532, which effectively prevents the horizontal fixing plate 5531 from bending or warping downwards after bearing the weight of the four-way reversing valve 52 and the pipeline vibration load for a long time, thereby maintaining the horizontality of the four-way reversing valve 52 and ensuring smooth valve core reversing without jamming.

[0077] The central support platform 553 also includes two buffer supports 5534. Each buffer support 5534 includes two legs 5535 and a transverse support rod 5536 connecting the two legs 5535. The legs 5535 are fixed to the upper surface of the transverse fixed plate 5531. A gap is formed between the transverse support rod 5536 and the upper surface of the transverse fixed plate 5531. The four-way directional valve 52 is fixed to the upper surface of the transverse support rod 5536. The buffer support 5534 suspends the four-way directional valve 52, forming a shock-absorbing buffer layer. This gap not only provides vibration isolation space but can also be filled with rubber pads or spring washers to further enhance the shock absorption effect. When the vibration of the compressor 51 is transmitted to the horizontal fixed plate 5531 through the vertical support column 551, the vibration transmission path is extended because the four-way directional valve 52 is not directly rigidly connected to the horizontal fixed plate 5531, but is connected through a slender support leg 5535 and a horizontal support rod 5536. The vibration energy is consumed by the slight elastic deformation of the support leg 5535 during transmission, thus significantly attenuating the vibration transmitted to the four-way directional valve 52. This is particularly important for protecting the delicate slide valve and seals inside the four-way directional valve 52, and can significantly improve its switching reliability and trouble-free operating time in continuous vibration environments in ships and marine engineering.

[0078] The horizontal fixing plate 5531 has a vertically penetrating drainage hole 5537 located below the gas-liquid separator 53. The drainage hole 5537 allows for the timely drainage of condensate dripping from the surface of the gas-liquid separator 53. When the dehumidifier operates in a high-humidity marine environment, the outer shell temperature of the gas-liquid separator 53 is typically below the dew point temperature, resulting in significant condensation on its surface. Without a drainage hole, this condensate would accumulate on the horizontal fixing plate 5531, potentially spreading to the solenoid coil or terminals of the four-way reversing valve 52, causing short circuits or corrosion. The drainage hole 5537 allows condensate to flow quickly to the lower drip tray or be discharged directly outside the machine. Simultaneously, this hole also serves a ventilation and heat dissipation function, helping to reduce the air humidity above the horizontal fixing plate 5531 and minimizing the risk of moisture damage and salt spray corrosion to electrical components in a high-salt-spray marine environment.

[0079] The mounting bracket 55 also includes a second fixing member 556, which is fixed to the side of the vertical support column 551 and located in the middle of the vertical support column 551. The first intake pipe 56 connects the outlet 532 of the upper gas-liquid separator 53 and the intake port 512 of the lower compressor 51, and passes through and is fixed to the second fixing member 556. The second fixing member 556 constrains the swaying of the first intake pipe 56. Due to the large vertical span of the first intake pipe 56, it is prone to low-frequency oscillation under the excitation of airflow pulsation and vibration of the compressor 51 when there is no support in the middle. The second fixing member 556 provides lateral constraint in the middle of the vertical support column 551, forcibly fixing the vibration node of this long pipe section, thereby raising the natural frequency of the pipe to outside the operating frequency range and avoiding resonance. It is especially suitable for pipe protection in broadband vibration environments of ships and marine engineering facilities. Meanwhile, the second fastener 556 is positioned in the middle, so that the lengths of the upper and lower pipe sections are approximately equal, the force is evenly distributed, and stress is avoided from concentrating at one end.

[0080] like Figures 7 to 9As shown, the upper support platform 552 includes an upper fixed seat 5521 and an adjusting shim 5522. The upper end of the vertical support column 551 is fixed to the lower surface of the upper fixed seat 5521. The adjusting shim 5522 is fixed to the upper surface of the upper fixed seat 5521, and the gas-liquid separator 53 is fixed to the upper surface of the adjusting shim 5522. The adjusting shim 5522 can finely adjust the installation height of the gas-liquid separator 53. In actual production, there may be tolerances in the positions of the inlet and outlet pipes of the gas-liquid separator 53, and there may also be accumulated tolerances in the positions of the compressor 51 and the four-way reversing valve 52. If rigid fixing is used, it may cause forced assembly stress during pipeline connection, leading to interface breakage after long-term operation. By selecting combinations of shims of different thicknesses or numbers, the adjusting shim 5522 can accurately compensate for accumulated tolerances on the assembly site, allowing the pipeline to align with the interface in a natural state, achieving a zero-stress connection. In addition, the adjusting shim 5522 also makes the same set of mounting brackets 55 compatible with gas-liquid separators 53 of different brands or models with slightly different heights, enhancing the versatility of parts and procurement flexibility.

[0081] like Figures 7 to 9 As shown, the compression separation assembly 5 also includes an exhaust pipe 54, a four-way reversing valve 52 located above the compressor 51, a high-pressure inlet 521 of the four-way reversing valve 52 horizontally positioned, and an exhaust port 511 of the compressor 51 horizontally positioned; both ends of the exhaust pipe 54 are connected to the exhaust port 511 of the compressor 51 and the high-pressure inlet 521 of the four-way reversing valve 52 respectively; the exhaust pipe 54 is divided into a first horizontally extending section 541, a first vertically extending section 542, a bottom curved section 543 extending downward and then upward, a second vertically extending section 544, and a second horizontally extending section 545, with the port of the first horizontally extending section 541 connected to the exhaust port 511 and the port of the second horizontally extending section 545 connected to the high-pressure inlet 521.

[0082] The high-temperature, high-pressure gaseous refrigerant generated during compressor 51 operation is discharged from exhaust port 511, flows horizontally through the first transverse section 541, enters the first vertical section 542 and flows downwards, then passes through the bottom bend section 543 and flows upwards to the second vertical section 544, finally entering the high-pressure inlet 521 of the four-way reversing valve 52 through the second transverse section 545. The bottom bend section 543 is U-shaped. This U-shaped structure can absorb vibration energy through its elastic deformation when compressor 51 vibrates, preventing the vibration from being directly transmitted to the four-way reversing valve 52. Simultaneously, when the exhaust pipe 54 undergoes thermal expansion due to the flow of high-temperature refrigerant, the bottom bend section 543 can compensate for this expansion through the deformation of its bend, effectively reducing thermal stress at pipe connections and preventing weld cracking or joint loosening. This is particularly important for ships and marine engineering equipment that are subjected to continuous vibration over long periods. In addition to the elastic buffering effect of the bottom bend section 543, the other sections of the exhaust pipe 54 also have synergistic technical effects. The first horizontal section 541 smoothly connects to the horizontally positioned exhaust port 511 at the top of the compressor 51, avoiding direct bending at the exhaust port 511 and effectively reducing the local flow resistance of the high-temperature, high-pressure refrigerant gas flow. The first vertical section 542 utilizes gravity to cause the refrigerant oil entrained in the refrigerant gas flow to deposit downwards along the pipe wall to the bottom curved section 543. The second vertical section 544, while raising the refrigerant to a higher level, further utilizes gravity to cause residual oil droplets to settle and flow back. The second horizontal section 545 precisely connects to the horizontally positioned high-pressure inlet 521 of the four-way reversing valve 52, achieving stress-free installation.

[0083] The axes of the first transverse section 541, the first vertical section 542, the bottom bend section 543, the second vertical section 544, and the second transverse section 545 of the exhaust pipe 54 are all located in the same vertical plane. By arranging the axes of each section of the exhaust pipe 54 in the same vertical plane, the deformation direction of each section is consistent and the stress is uniform when the pipe is subjected to the vibration excitation of the compressor 51 and the deformation caused by thermal expansion and contraction. This avoids the additional torsional force caused by spatial bending, thereby further improving the overall fatigue resistance and long-term reliability of the exhaust pipe 54. The high-pressure inlet 521 of the four-way reversing valve 52 is closer to the second vertical section 544 than the exhaust port 511 of the compressor 51. This arrangement makes the length of the second transverse section 545 shorter, effectively reducing the inherent length of the suspended pipe, avoiding low-frequency vibration caused by gravity deflection and airflow impact in long-span horizontal pipes, further isolating residual stress, and ensuring the long-term sealing reliability of the high-pressure inlet 521 interface. The exhaust port 511 of the compressor 51 is located at the top of the compressor 51.

[0084] The exhaust pipe 54 extends from below the vertical connecting plate 5532 to one side of the vertical outer surface of the vertical connecting plate 5532, then extends upwards, and then extends laterally from above the horizontal fixing plate 5531 until it connects with the high-pressure inlet 521 of the four-way reversing valve 52. The mounting bracket 55 also includes a first fixing member 555, which is fixed to the vertical outer surface of the vertical connecting plate 5532. The exhaust pipe 54 passes through the first fixing member 555 and is fixed therein. This pipe routing method utilizes the natural geometry of the vertical connecting plate 5532 as the foundation for pipe support, allowing the exhaust pipe 54 to be reliably constrained without additional supports. The first fixing member 555 firmly binds the exhaust pipe 54 to the vertical connecting plate 5532, preventing the suspended pipe section from resonating under the pulsating vibration of the compressor 51. At the same time, the U-shaped bend formed by the exhaust pipe 54, which first bends downwards and then upwards, has elastic compensation capabilities, which can absorb the length changes caused by thermal expansion and contraction of the pipe and reduce thermal stress concentration.

[0085] like Figure 3 As shown, the bottom of the lower space 12 also includes two mounting bases 18. Each mounting base 18 includes two horizontally arranged mounting rods 181, which are parallel to each other. Three compression / separation components 5 are spaced apart along the extension direction of the mounting rods 181 on one mounting base 18, while one compression / separation component 5 is mounted on the other mounting base 18. The bottoms of each compression / separation component 5 are placed on and fixed to the corresponding two mounting rods 181. The parallel double-beam structure of the mounting rods 181 provides a stable support plane, and the gap between the two mounting rods 181 facilitates the passage of pipes and wiring harnesses, avoiding interference with the lower support platform 554. Simultaneously, this side-by-side arrangement ensures that the maintenance channels for each compression / separation component 5 are independent, and replacing one component will not affect the operation of adjacent components, greatly improving the convenience of on-site maintenance in the compact cabin environment of ships and offshore engineering facilities.

[0086] In other embodiments, the number of compression separation components 5 and the number of mounting bases 18 can be adjusted according to the actual dehumidification load and air supply requirements. For example, one, two or four sets of compression separation components 5 can be set on a single mounting base 18. It is not limited to the arrangement disclosed in this embodiment. This flexible configuration enables the fresh air dehumidifier to adapt to the diverse needs of different scale application scenarios and has good serialization expansion capabilities.

[0087] like Figure 3 and Figure 4As shown, the inner coil assembly 3 is placed vertically inside the inner coil mounting box 14. The inner coil assembly 3 is arranged in a row along the direction from the air inlet grille 15 to the air inlet 41 of the blower 4. The windward side of the inner coil assembly 3 is parallel to the air inlet grille 15, and the leeward side of the inner coil assembly 3 is opposite to the windward side of the adjacent inner coil assembly 3. The arrangement of multiple inner coil assemblies 3 along the airflow direction with their windward sides parallel to the air inlet grille 15 allows fresh air to flow evenly and sequentially across the heat exchange surfaces of each group of inner coil assemblies 3 after entering from the air inlet grille 15. Each inner coil assembly 3 is connected to its corresponding heat pump circuit, enabling multi-stage heat exchange, increasing the effective heat exchange area, and improving dehumidification efficiency.

[0088] like Figure 3 and Figure 4 As shown, the air supply fan 4 is installed between the inner coil mounting box 14 and the compression separation assembly 5. The air supply fan 4 is positioned between the inner coil mounting box 14 and the compression separation assembly 5. The air inlet 41 of the air supply fan 4 is connected to the end of the inner coil mounting box 14 furthest from the air inlet grille 15, and is used to draw in air that has been processed by the inner coil assembly 3. The air outlet 42 of the air supply fan 4 is connected to the compartment or air supply duct network, forcibly delivering the processed dry air to its destination, achieving directional delivery of fresh air. The positioning of the air supply fan 4 avoids heat-generating components such as the compressor 51 in the compression separation assembly 5, preventing hot air short-circuiting and ensuring the stability of the supply air temperature.

[0089] like Figures 4 to 6 As shown, the fresh air dehumidifier also includes four sets of throttling components 7. The throttling components 7 connect the heat exchange tubes of the outer coil assembly 2 and the inner coil assembly 3. The throttling components 7 and the compression separation component 5 are respectively connected to both ends of the heat exchange tubes of the inner coil assembly 3. The number of throttling components 7 is equal to that of the outer coil assembly 2 and the inner coil assembly 3, and they are correspondingly arranged. The throttling components 7 reduce the pressure of the high-temperature, high-pressure liquid refrigerant to a low-temperature, low-pressure gas-liquid two-phase state, providing conditions for the refrigerant to evaporate and absorb heat in the inner coil assembly 3.

[0090] The throttling assembly 7 includes an expansion valve 71, a first filter 72, and a second filter 73. The first filter 72 and the second filter 73 are located at opposite ends of the expansion valve 71. The first filter 72 connects the expansion valve 71 to the heat exchange tubes of the outer coil assembly 2, and the second filter 73 connects the expansion valve 71 to the heat exchange tubes of the inner coil assembly 3. The expansion valve 71 precisely throttles and reduces the pressure of the refrigerant. The first filter 72 and the second filter 73 filter the refrigerant entering and leaving the expansion valve 71, effectively removing impurities and moisture from the pipeline, preventing blockage of the expansion valve 71 and refrigeration system, and ensuring the purity of the refrigeration cycle under long-term continuous operation conditions in ships and marine engineering.

[0091] like Figures 3 to 6As shown, the fresh air dehumidifier also includes four sets of reheat pipe assemblies 6. The reheat pipe assemblies 6 are located between the external coil assembly 2 and the throttling assembly 7. The reheat pipe assemblies 6 connect the heat exchange tubes of the external coil assembly 2 to the throttling assembly 7. The number of reheat pipe assemblies 6 is equal to that of the external coil assembly 2 and the throttling assembly 7, and they are correspondingly arranged. The reheat pipe assemblies 6 utilize part of the heat from the high-temperature refrigerant in the external coil assembly 2 to reheat the fresh air, achieving the dual functions of refrigerant subcooling and fresh air reheating—improving the energy efficiency ratio of the refrigeration cycle and heating the low-temperature air after cooling and dehumidification by the internal coil assembly 3 to a suitable supply air temperature. This avoids excessively low supply air temperatures in ship cabins, which could cause discomfort to personnel or condensation on equipment, and achieves independent temperature and humidity control.

[0092] The reheat piping assembly 6 includes a reheat coil 61, a reheat flow regulating valve 62, and a one-way valve 63. The heat exchange tubes of the reheat coil 61 are connected to the heat exchange tubes of the external coil assembly 2 and the throttling assembly 7. The reheat flow regulating valve 62 is located between the heat exchange tubes of the reheat coil 61 and the heat exchange tubes of the external coil assembly 2. The one-way valve 63 is located between the heat exchange tubes of the reheat coil 61 and the throttling assembly 7. The reheat flow regulating valve 62 can precisely control the amount of high-temperature refrigerant entering the reheat coil 61, thereby regulating the reheat amount and achieving precise control of the supply air temperature. The one-way valve 63 ensures that the refrigerant flows in one direction in the reheat coil 61, preventing reverse flow.

[0093] The reheat piping assembly 6 also includes a bypass piping 64, which connects the heat exchange tubes of the external coil assembly 2 and the throttling assembly 7. The bypass piping 64 is connected in parallel with the reheat coil 61. The bypass piping 64 provides a flow path for the refrigerant to bypass the reheat coil 61. When reheating is not required (such as in a high-temperature and high-humidity environment in summer where only cooling and dehumidification are needed), the refrigerant can directly enter the throttling assembly 7 through the bypass piping 64, avoiding unnecessary reheating and improving the system's energy efficiency and operational flexibility.

[0094] Furthermore, the reheat piping assembly 6 also includes a bypass flow regulating valve 65, which is installed on the bypass piping 64. The bypass flow regulating valve 65 can precisely control the flow rate of refrigerant in the bypass piping 64. When used in conjunction with the reheat flow regulating valve 62, it enables continuous stepless adjustment of the reheat capacity, further improving the accuracy of the supply air temperature control and the system's adaptability to different marine climate conditions.

[0095] like Figure 3 and Figure 4As shown, the reheat coil 61 is installed inside the inner coil mounting box 14, and is positioned between the inner coil assembly 3 and the air inlet 41 of the air supply fan 4. The placement of the reheat coil 61 between the inner coil assembly 3 and the air inlet 41 of the air supply fan 4 ensures that the low-temperature air cooled and dehumidified by the inner coil assembly 3 flows through the reheat coil 61 for heating before entering the air supply fan 4, and is then discharged from the air outlet 42 by the air supply fan 4. This arrangement ensures that the reheated air can be promptly delivered to the compartment by the air supply fan 4, reducing heat loss; simultaneously, the reheat coil 61 and the inner coil assembly 3 share a single inner coil mounting box 14, resulting in a compact structure and saving installation space.

[0096] Among them, the reheat coils 61 of several reheat piping assemblies 6 are integrated into one unit. The integration of the reheat coils 61 of multiple reheat piping assemblies 6 into one unit reduces the gaps and redundant structures between the coils, resulting in higher space utilization and lower airflow resistance within the inner coil mounting box 14.

[0097] like Figure 3 and Figure 4 As shown, the air supply fan 4 is installed between the inner coil mounting box 14 and the compression separation assembly 5, and the throttling assembly 7 is also installed between the inner coil mounting box 14 and the compression separation assembly 5, with the throttling assembly 7 installed on the side of the air supply fan 4. The installation of the throttling assembly 7 on the side of the air supply fan 4 makes full use of the unused space on the side of the air supply fan 4, resulting in a more compact and reasonable layout of the lower space 12 of the entire unit. The throttling assembly 7 is adjacent to the inner coil mounting box 14, shortening the length of the heat exchange tube between the throttling assembly 7 and the inner coil assembly 3, thus reducing flow resistance.

[0098] like Figures 10 to 15As shown, the external coil assembly 2 includes two external heat exchangers 21, a top sealing plate 22, two side sealing plates 23, and a heat exchange fan 24. The external heat exchangers 21 are flat plates and include an upper edge 211, a lower edge 212, and two side edges 213. The lower edges 212 of the two external heat exchangers 21 are fixed together, and the upper edges 211 of the two external heat exchangers 21 are separated. The top sealing plate 22 is horizontally arranged and rectangular. The four edges of the top sealing plate 22 are two oppositely arranged horizontal sealing edges 221 and two oppositely arranged side sealing edges 222. The two horizontal sealing edges 221 of the top sealing plate 22 are fixed to the upper edges 211 of the two external heat exchangers 21 respectively. The side sealing plates 23 are vertically arranged, with two side sealing plates 23 located on both sides of the external heat exchanger 21. The side sealing plates 23 are triangular, with three edges consisting of a horizontally arranged upper sealing edge 231 and two downwardly extending and intersecting oblique sealing edges 232. The upper sealing edges 231 of the two side sealing plates 23 are fixed to the two side sealing edges 222 of the top sealing plate 22. The two oblique sealing edges 232 of the side sealing plates 23 are fixed to the side edges 213 of the two external heat exchangers 21. A heat exchange duct 26 is formed between the two side sealing plates 23, the two external heat exchangers 21, and the top sealing plate 22. A heat exchange fan 24 is located on the top sealing plate 22 and connects the heat exchange duct 26 to the external space.

[0099] The aforementioned external coil assembly 2 adopts a structure where the lower edges 212 of the two external heat exchangers 21 are fixed and the upper edges 211 are separated, forming a V-shaped structure with a triangular cross-section. This triangular structure has excellent structural stability and can effectively withstand the vibration of the heat exchange fan 24 during operation, meeting the stringent requirements of ships and marine engineering equipment for structural strength and vibration resistance. At the same time, this structure naturally forms a heat exchange duct 26 with a gradually increasing cross-sectional area from bottom to top, so that the airflow velocity gradually decreases and the pressure gradually recovers during the upward flow, which is conducive to the uniform distribution of airflow and reduces local eddies and flow resistance. When the heat exchange fan 24 is working, a negative pressure is formed in the heat exchange duct 26. External air enters the heat exchange duct 26 evenly from the outer windward side of the external heat exchanger 21 through the coil gap, exchanges heat with the refrigerant flowing through the heat exchange tubes of the external heat exchanger 21, absorbs or releases heat, and is then discharged by the heat exchange fan 24. This forced convection heat exchange method significantly improves the heat exchange efficiency between the external heat exchanger 21 and the external environment, enabling the refrigerant to quickly exchange heat with the external environment under different operating modes. It is especially suitable for installation environments where heat dissipation conditions in ship and marine engineering equipment compartments are limited.

[0100] like Figures 10 to 15As shown, the external coil assembly 2 also includes a bottom connector 25, to which the lower edges 212 of the two external heat exchangers 21 are fixed. The bottom connector 25 provides a stable base for fixing the lower edges 212 of the two external heat exchangers 21, ensuring that the included angle between the two external heat exchangers 21 remains unchanged during long-term use.

[0101] The bottom connector 25 includes two support plates 251 and several support seats 252. The extending direction of the support plates 251 is parallel to the extending direction of the lower edge 212 of the external heat exchanger 21. The upper edges of the support plates 251 are connected to each other, and the two support plates 251 form an included angle. The lower edges 212 of the two external heat exchangers 21 are fixed to the upper surfaces of the two support plates 251 respectively. The support seats 252 are located below the support plates 251 and are fixed to the lower surfaces of the support plates 251. Several support seats 252 are spaced apart along a direction parallel to the upper edges of the support plates 251. The included angle formed by the two support plates 251 matches the included angle of the two external heat exchangers 21, providing a precise installation reference surface. The support seats 252 strengthen and fix the support plates 251, preventing the support plates 251 from deforming due to stress.

[0102] Furthermore, the lower edge of the support plate 251 forms an upwardly folded flange 253, and the lower edge 212 of the external heat exchanger 21 is provided with a downwardly extending limiting foot 214, which fits against the inner surface of the flange 253. The cooperation between the limiting foot 214 and the flange 253 enables the external heat exchanger 21 to be quickly positioned on the support plate 251, preventing the external heat exchanger 21 from sliding in the horizontal direction and simplifying the assembly process.

[0103] Furthermore, the lower edge 212 of the external heat exchanger 21 is provided with a downwardly extending support foot 215, which is fixed to the upper surface of the support plate 251. The support foot 215 creates a water passage gap 27 between the lower edge 212 of the external heat exchanger 21 and the support plate 251. The support foot 215 elevates the lower edge 212 of the external heat exchanger 21, and the water passage gap 27 provides a flow channel for condensate. When condensate generated on the surface of the external heat exchanger 21 flows to the lower edge 212, the water passage gap 27 ensures that the condensate can flow out smoothly, avoiding water accumulation due to surface tension. This effectively prevents condensate from accumulating at the joint surface between the external heat exchanger 21 and the support plate 251 in a high-humidity marine environment, thereby avoiding the problems of accelerated corrosion and bacterial growth in the marine environment caused by long-term water accumulation.

[0104] Furthermore, the support plate 251 is provided with several drainage holes 254 penetrating the support plate 251, and the drainage holes 254 connect the water passage 27 to the external space. The drainage holes 254 provide the final drainage path for the condensate in the water passage 27. The condensate flows from the water passage 27 into the drainage holes 254 and then is discharged to the outside, ensuring that the surface of the external heat exchanger 21 always remains dry, further optimizing the drainage performance and corrosion resistance in the high humidity environment of ships and marine engineering.

[0105] like Figure 15 As shown, the side edge 213 of the external heat exchanger 21 forms an outwardly extending rolled edge 216, and an isolation gap 28 is formed between the rolled edge 216 and the side edge 213 of the external heat exchanger 21. The oblique sealing edge 232 of the side sealing plate 23 contacts and seals the rolled edge 216. The rolled edge 216 provides a flat and continuous sealing surface, which facilitates a reliable seal with the side sealing plate 23. At the same time, the isolation gap 28 between the rolled edge 216 and the side edge 213 acts as an air insulation layer, effectively blocking the low temperature of the side edge 213 of the external heat exchanger 21 from being conducted outward through the side sealing plate 23, reducing cold loss, and preventing condensation from forming on the outer surface of the side sealing plate 23 due to excessively low temperature in the high humidity environment of the ocean.

[0106] like Figures 12 to 13 As shown, the heat exchange fan 24 has a fixed plate 241 extending outward in the circumferential direction, and a central air hole 223 is formed in the middle of the top sealing plate 22. The heat exchange fan 24 and the central air hole 223 are coaxially arranged, and the fixed plate 241 is attached to and sealed with the upper surface of the top sealing plate 22. The contact and sealing between the fixed plate 241 and the upper surface of the top sealing plate 22 ensures the airtightness of the connection between the heat exchange fan 24 and the heat exchange duct 26, preventing hot air from leaking from the connection gap, and also preventing external air that has not been heat-exchanged by the external heat exchanger 21 from short-circuiting into the heat exchange duct 26 from the connection.

[0107] like Figures 1 to 3 As shown, the upper space 11 forms four outer coil mounting frames 16, each housing an outer coil assembly 2. Each outer coil mounting frame 16 has an annular fixing frame 17. The outer coil assembly 2 is placed on a transverse support beam 13, which is perpendicular to the lower edge 212 of the outer coil assembly 2. The annular fixing frame 17 surrounds the top sealing plate 22 and is fixed to the outer circumferential surface of the top sealing plate 22. The transverse support beam 13 bears the weight of the outer coil assembly 2, and the annular fixing frame 17 positions and fixes the top sealing plate 22, securely mounting the outer coil assembly 2 within the upper space 11.

[0108] like Figures 1 to 3As shown, four external coil mounting frames 16 are arranged horizontally in the transverse direction. The four external coil assemblies 2 work in parallel, which multiplies the heat dissipation capacity of the entire unit. By arranging the external coil mounting frames 16 in the upper space 11 of the main frame 1, the heat generated by the external heat exchanger 21 can be discharged upwards, avoiding the downward diffusion of heat and affecting the working efficiency of other components such as the internal coil assembly 3 located in the lower space 12. This is particularly suitable for applications where the vertical space in ship and marine engineering equipment compartments is limited and there are strict requirements for the organization of hot airflow.

[0109] Based on the above structure, the working principle of the heat pump type fresh air dehumidifier for ships and marine engineering of the present invention is as follows: In cooling / dehumidifying mode, the four-way reversing valve 52 is activated, connecting the exhaust port 511 of the compressor 51 to the external coil interface 523 via the four-way reversing valve 52, while simultaneously connecting the low-pressure outlet 522 to the internal coil interface 524. The high-temperature, high-pressure gaseous refrigerant discharged from the compressor 51 enters the external coil assembly 2 located in the upper space 11, flows through the heat exchange tubes of each external heat exchanger 21 (at this time, the external coil assembly 2 acts as a condenser), and driven by the heat exchange fan 24, external cold air evenly passes through the coil gaps from the outer windward side of the external heat exchanger 21 into the heat exchange duct 26, where it exchanges heat with the high-temperature, high-pressure gaseous refrigerant in the heat exchange tubes, absorbs heat, becomes hot air, and is discharged to the external space by the heat exchange fan 24. During this process, the refrigerant condenses into a high-pressure liquid. Subsequently, the high-pressure liquid refrigerant is throttled and depressurized by the throttling assembly 7 (including expansion valve 71, first filter 72 and second filter 73), becoming a low-temperature, low-pressure gas-liquid two-phase state. It then enters the inner coil assembly 3 located in the lower space 12 and flows through the coils of each row of inner coil assembly 3 (at this time, the inner coil assembly 3 acts as an evaporator). The low-temperature, low-pressure refrigerant evaporates and absorbs heat inside, causing the surface temperature of the coil to drop below the dew point. At the same time, fresh air, driven by the air supply fan 4, enters the inner coil mounting box 14 from the air inlet grille 15 and flows sequentially through each row of vertically arranged inner coil assembly 3 along the direction from the air inlet grille 15 to the air inlet 41 of the air supply fan 4. Water vapor in the air condenses into condensate on the surface of the low-temperature coil and is discharged. The air temperature decreases, the humidity decreases, and it becomes dry, cold air. Dry, cold air then flows through the reheat coil 61 of the reheat pipe assembly 6, is moderately heated, is drawn in through the air inlet 41 of the blower 4, and is finally delivered to the cabin through the air outlet 42, achieving cooling, dehumidification, and comfortable air supply.

[0110] In heating mode, the four-way reversing valve 52 reverses its direction, connecting the compressor 51's exhaust port 511 to the inner coil interface 524 via the four-way reversing valve 52, while simultaneously connecting the low-pressure outlet 522 to the outer coil interface 523. The high-temperature, high-pressure gaseous refrigerant discharged from the compressor 51 enters the inner coil assembly 3 located in the lower space 12, flowing through the coils of each row of inner coil assemblies 3 (at this time, the inner coil assembly 3 acts as a condenser). The high-temperature refrigerant condenses and releases heat inside, heating the fresh air flowing over the coil surface, thus increasing the supply air temperature and achieving heating and air supply. Driven by the supply fan 4, the fresh air enters the inner coil mounting box 14 from the air inlet grille 15, flowing sequentially through each row of vertically arranged inner coil assemblies 3 along the direction from the air inlet grille 15 to the air inlet 41 of the supply fan 4. After being gradually heated, it is drawn in through the air inlet 41 of the supply fan 4 and delivered to the compartment through the air outlet 42. After condensation, the high-pressure liquid refrigerant is throttled and depressurized by the throttling assembly 7 (including expansion valve 71, first filter 72 and second filter 73) and enters the outer coil assembly 2 located in the upper space 11. It flows through the heat exchange tubes of each external heat exchanger 21 (at this time, the outer coil assembly 2 acts as an evaporator). Driven by the heat exchange fan 24, the outside air passes through the coil gap of the external heat exchanger 21 and enters the heat exchange duct 26, where it exchanges heat with the low-temperature and low-pressure refrigerant in the heat exchange tube. The refrigerant absorbs heat from the outside air and evaporates into a gaseous state. The evaporated gaseous refrigerant enters the gas-liquid separator 53 through the low-pressure outlet 522 of the four-way reversing valve 52. After gas-liquid separation, it returns to the suction port 512 of the compressor 51, completing the heating cycle.

[0111] In both modes, the four-way reversing valve 52 switches between cooling / dehumidification and heating functions by changing the refrigerant flow direction. This allows the entire unit to flexibly adjust its operating mode according to environmental conditions and environmental control requirements throughout the entire operating cycle of the ship and marine engineering facilities, eliminating the need for additional electric heating equipment and significantly reducing operating energy consumption. Simultaneously, in cooling / dehumidification mode, the reheat piping assembly 6 utilizes some of the heat from the high-temperature refrigerant in the external coil assembly 2 to reheat the fresh air, achieving both refrigerant subcooling and fresh air reheating. This regulates the supply air temperature to a comfortable range without additional energy consumption, enabling independent control of temperature and humidity.

[0112] Through the above-described layered layout, in cooling / dehumidification mode, the external coil assembly 2, acting as a condenser, is located in the upper space 11. The heat dissipated by its external heat exchanger 21 is discharged upwards by the heat exchange fan 24, preventing heat from diffusing downwards and affecting the cooling efficiency of the internal coil assembly 3 (evaporator). In heating mode, the external coil assembly 2, acting as an evaporator, is located in the upper space 11. Its external heat exchanger 21 can absorb heat from the relatively stable external airflow environment above, ensuring heat exchange efficiency under heating conditions. This layout structure effectively isolates the external coil assembly 2 from the internal coil assembly 3 in different modes, reducing thermal interference and improving the overall energy efficiency of the unit under different seasonal conditions.

[0113] This invention is not limited to the embodiments described above. Any changes in shape or structure shall fall within the protection scope of this invention. The protection scope of this invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of this invention, but all such changes and modifications shall fall within the protection scope of this invention.

Claims

1. A heat pump type fresh air dehumidifier for ships and marine engineering, characterized in that, include: The main frame has horizontally arranged transverse support beams that divide the internal space of the main frame into an upper space and a lower space, with the upper space located above the lower space. At least one set of external coil assembly, the external coil assembly being installed within the upper space; At least one set of inner coil assembly, the lower space forms an inner coil mounting box, the inner coil assembly is installed in the inner coil mounting box, and the end face of the inner coil mounting box is provided with an air inlet grille that communicates with the outside. A blower is installed in the lower space, and the air inlet of the blower is connected to the end face of the inner coil mounting box away from the air inlet grille. At least one set of compression separation components is installed in the lower space. The compression separation components are connected to the heat exchange tubes of the outer coil assembly and the inner coil assembly. The number of compression separation components, outer coil assembly and inner coil assembly are equal and they are arranged accordingly.

2. The fresh air dehumidifier as described in claim 1, characterized in that: The compression separation assembly includes a compressor, a four-way reversing valve, and a gas-liquid separator. The suction port of the compressor is connected to the outlet port of the gas-liquid separator, the inlet port of the gas-liquid separator is connected to the low-pressure outlet of the four-way reversing valve, the discharge port of the compressor is connected to the high-pressure inlet of the four-way reversing valve, the outer coil interface of the four-way reversing valve is connected to the heat exchange tube of the outer coil assembly, and the inner coil interface of the four-way reversing valve is connected to the heat exchange tube of the inner coil assembly. The four-way reversing valve can switch between cooling and heating modes. In cooling mode, the high-pressure inlet is connected to the external coil interface, and the low-pressure outlet is connected to the internal coil interface. In heating mode, the high-pressure inlet is connected to the internal coil interface, and the low-pressure outlet is connected to the external coil interface.

3. The fresh air dehumidifier as described in claim 2, characterized in that: The compression separation assembly also includes a mounting bracket, which includes at least one vertically arranged vertical support column and an upper support platform, a middle support platform, and a lower support platform fixed on the vertical support column. The heights of the upper support platform, the middle support platform, and the lower support platform decrease sequentially. The compressor is fixed on the lower support platform, the four-way reversing valve is fixed on the middle support platform, and the gas-liquid separator is fixed on the upper support platform.

4. The fresh air dehumidifier as described in claim 2, characterized in that: The compression separation assembly also includes an exhaust pipe. The four-way reversing valve is located above the compressor. The high-pressure inlet of the four-way reversing valve is horizontally positioned, and the exhaust port of the compressor is horizontally positioned. The two ends of the exhaust pipe are respectively connected to the exhaust port of the compressor and the high-pressure inlet of the four-way reversing valve. The exhaust pipe is divided into a first horizontally extending section, a first vertically extending section downwards, a bottom curved section extending downwards and then upwards, a second vertically extending section upwards, and a second horizontally extending section. The port of the first horizontal section is connected to the exhaust port, and the port of the second horizontal section is connected to the high-pressure inlet.

5. The fresh air dehumidifier as described in any one of claims 1 to 4, characterized in that: The bottom of the lower space also includes at least one mounting base, the mounting base including two horizontally arranged mounting rods, the two mounting rods being parallel to each other; a plurality of compression separation components are spaced apart along the extension direction of the mounting rods, the bottom of the compression separation components being placed on the two mounting rods and fixed together.

6. The fresh air dehumidifier as described in claim 1, characterized in that: The number of inner coil assemblies is at least two sets. The inner coil assemblies are placed vertically in the inner coil mounting box. Several inner coil assemblies are arranged in a row along the direction from the air inlet grille to the air inlet of the blower. The windward side of the inner coil assembly is parallel to the air inlet grille, and the leeward side of the inner coil assembly is opposite to the windward side of the adjacent inner coil assembly.

7. The fresh air dehumidifier as described in claim 1, characterized in that: The air supply fan is installed between the inner coil mounting box and the compression separation assembly.

8. The fresh air dehumidifier as described in claim 1, characterized in that: The fresh air dehumidifier also includes at least one set of throttling components. The throttling components are connected to the heat exchange tubes of the outer coil assembly and the heat exchange tubes of the inner coil assembly. The throttling components and the compression separation components are respectively connected to the two ends of the heat exchange tubes of the inner coil assembly. The number of throttling components is equal to that of the outer coil assembly and the inner coil assembly, and they are arranged accordingly.

9. The fresh air dehumidifier as described in claim 8, characterized in that: The throttling assembly includes an expansion valve, a first filter, and a second filter. The first filter and the second filter are located at opposite ends of the expansion valve. The first filter connects the expansion valve to the heat exchange tube of the outer coil assembly, and the second filter connects the expansion valve to the heat exchange tube of the inner coil assembly.

10. The fresh air dehumidifier as described in claim 8, characterized in that: The fresh air dehumidifier also includes at least one set of reheat pipe assembly, which is disposed between the external coil assembly and the throttling assembly. The reheat pipe assembly connects the heat exchange tube of the external coil assembly to the throttling assembly. The number of reheat pipe assemblies is equal to that of the external coil assembly and the throttling assembly, and they are arranged accordingly.

11. The fresh air dehumidifier as described in claim 10, characterized in that, The reheat piping assembly includes: The reheat coil is connected to the heat exchange tubes and throttling components of the outer coil assembly. A reheat flow regulating valve is disposed between the heat exchange tubes of the reheat coil and the heat exchange tubes of the outer coil assembly. A one-way valve is disposed between the heat exchange tube of the reheat coil and the throttling assembly.

12. The fresh air dehumidifier as described in claim 11, characterized in that: The reheat piping assembly also includes a bypass piping, which connects to the heat exchange tubes and throttling components of the external coil assembly, and is arranged in parallel with the reheat coil.

13. The fresh air dehumidifier as described in claim 12, characterized in that: The reheat piping assembly also includes a bypass flow regulating valve, which is disposed on the bypass piping.

14. The fresh air dehumidifier as described in claim 11, characterized in that: The reheat coil is installed inside the inner coil mounting box, and the reheat coil is located between the inner coil assembly and the air inlet of the blower.

15. The fresh air dehumidifier as described in claim 11 or 14, characterized in that: The number of reheat piping assemblies is at least two sets, and the reheat coils of several reheat piping assemblies are integrated into one unit.

16. The fresh air dehumidifier as described in claim 8 or 9, characterized in that: The air supply fan is installed between the inner coil mounting box and the compression separation assembly, the throttling assembly is installed between the inner coil mounting box and the compression separation assembly, and the throttling assembly is installed on the side of the air supply fan.

17. The fresh air dehumidifier as described in claim 1, characterized in that, The external coil assembly includes: Two external heat exchangers, the external heat exchangers are flat plate type, the external heat exchangers include an upper edge located at the top, a lower edge located at the bottom, and two side edges located on the sides, the lower edges of the two external heat exchangers are fixed together, and the upper edges of the two external heat exchangers are separated. A top sealing plate is horizontally arranged and rectangular. The four edges of the top sealing plate are two oppositely arranged horizontal sealing edges and two oppositely arranged side sealing edges. The two horizontal sealing edges of the top sealing plate are fixed to the upper edges of the two external heat exchangers respectively. Two side sealing plates are vertically arranged and located on both sides of the external heat exchanger. The side sealing plates are triangular, with a horizontally arranged upper sealing edge and two downwardly extending and intersecting oblique sealing edges on their three edges. The upper sealing edges of the two side sealing plates are fixed to the two side sealing edges of the top sealing plate. The two oblique sealing edges of the side sealing plates are fixed to the side edges of the two external heat exchangers. A heat exchange air duct is formed between the two side sealing plates, the two external heat exchangers, and the top sealing plate. A heat exchange fan is located on the top sealing plate and connects the heat exchange duct to the external space.

18. The fresh air dehumidifier as described in claim 17, characterized in that: The upper space forms at least one external coil mounting frame, and a set of external coil assemblies are installed in each external coil mounting frame. The outer coil mounting frame is provided with an annular fixing frame. The outer coil assembly is placed on the transverse support beam, and the transverse support beam is perpendicular to the lower edge of the outer coil assembly. The annular fixing frame surrounds the top sealing plate and is fixed to the outer peripheral surface of the top sealing plate.

19. The fresh air dehumidifier as described in claim 1, 17, or 18, characterized in that: The upper space forms multiple external coil mounting frames, and each external coil mounting frame installs a set of external coil assemblies; the multiple external coil mounting frames are arranged horizontally in the transverse direction.

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