LNG liquefied refrigerant drying and filtering device

Abstract

The utility model discloses a LNG liquefied refrigerant drying filter device relates to drying filter device technical field, including import coarse filter subassembly, export fine filter subassembly, protection shell and drying subassembly, be equipped with the mounting cavity in protection shell, and drying subassembly slidingly sets up in the mounting cavity, and import coarse filter subassembly and export fine filter subassembly set up respectively at protection shell both ends, are used for drying subassembly fixed in protection shell and the solid impurity in filtering refrigerant, wherein, drying subassembly includes containing casing and a pair of blocking structure, and is equipped with the containing cavity that penetrates both ends of containing casing in containing casing, and containing cavity is used for filling drying medium, and a pair of blocking structure sets up respectively at both ends of containing cavity, and with containing casing detachable connection, solved the refrigerant filter device of current when using, difficult to satisfy LNG system grading filtration demand, and drying function subassembly maintenance operation is complicated and time -consuming, can not effectively adapt the problem of LNG liquefaction scene.

Description

Technical Field

[0001] This utility model relates to the technical field of drying and filtration devices, specifically to a drying and filtration device for LNG liquefied refrigerant. Background Technology

[0002] Against the backdrop of the rapid development of the liquefied natural gas (LNG) industry, LNG liquefaction systems, as core equipment, place extremely high demands on the purity and dryness of the refrigerant. The LNG liquefaction process relies on the refrigerant to exchange heat through phase change within the circulating system. However, during production, storage, and recycling, the refrigerant is easily contaminated with solid impurities such as metal debris from pipeline corrosion and wear particles from sealing materials. Simultaneously, moisture from the air can seep in during system maintenance and due to leaks at interfaces. If not addressed promptly, this will directly affect the heat exchange efficiency and stable operation of the liquefaction system. Therefore, effective filtration and drying of the refrigerant is crucial for ensuring the reliable operation of the LNG liquefaction system.

[0003] Currently available refrigerant filtration devices on the market mostly employ a single filtration precision design or can only achieve coarse filtration, making it difficult to simultaneously meet the staged filtration requirements of LNG liquefaction systems. Furthermore, some filtration devices integrating drying functions often use fixed installation structures for their drying components. When the drying medium becomes saturated and needs replacement, the entire device must be disassembled, which is cumbersome and time-consuming. Therefore, there is an urgent need for a new type of LNG liquefaction refrigerant drying and filtration device that is suitable for LNG liquefaction scenarios and combines staged filtration, drying, and convenient maintenance. Utility Model Content

[0004] Based on this, and in response to the above problems, this utility model proposes an LNG liquefaction refrigerant drying and filtration device, which solves the problem that current refrigerant filtration devices are difficult to meet the graded filtration requirements of LNG systems, and that the maintenance and operation of the drying function components are cumbersome and time-consuming, making them unsuitable for LNG liquefaction scenarios.

[0005] The technical solution of this utility model is:

[0006] An LNG liquefied refrigerant drying and filtration device includes an inlet coarse filter assembly, an outlet fine filter assembly, a protective shell, and a drying assembly. The protective shell has an installation cavity extending through both ends. The drying assembly is disposed within the installation cavity and slidably connected to it. The inlet coarse filter assembly and the outlet fine filter assembly are respectively disposed at both ends of the protective shell, detachably connected to both ends of the protective shell, and cooperate with the installation cavity and the drying assembly to fix the drying assembly within the protective shell and filter solid impurities in the refrigerant. The drying assembly includes a receiving shell and a pair of blocking structures. The receiving shell has a receiving cavity extending through both ends, used to fill a drying medium. The pair of blocking structures are respectively disposed at both ends of the receiving cavity and detachably connected to the receiving shell. The pair of blocking structures prevent leakage of the drying medium within the receiving cavity. Refrigerant can flow into the receiving cavity through one blocking structure and out of the receiving cavity through the other blocking structure.

[0007] Preferably, the receiving cavity is provided with mounting grooves at both ends for installing the blocking structure. The mounting grooves are connected to the receiving cavity, and the blocking structure is set in the mounting groove and detachably connected to the receiving shell.

[0008] Preferably, the blocking structure includes an internal hexagonal locking ring and a blocking plate. The blocking plate is disposed in the mounting groove and is slidably connected to the inner sidewall of the mounting groove. The blocking plate is configured to cooperate with the receiving cavity. The internal hexagonal locking ring is disposed in the mounting groove and is threadedly connected to the inner sidewall of the mounting groove. One end of the internal hexagonal locking ring abuts against the blocking plate to fix the blocking plate in the mounting groove. The blocking plate is provided with several flow holes for refrigerant to pass through.

[0009] Preferably, the inner wall of the mounting cavity is provided with several limiting grooves, and the outer wall of the receiving housing is fixedly provided with several limiting sliders that cooperate with the several limiting grooves. The several limiting sliders are respectively located in the several limiting grooves and are slidably connected with the limiting grooves.

[0010] Preferably, there are four limiting grooves and four limiting sliders. The four limiting grooves are arranged in cooperation on the inner side wall of the mounting cavity, and the four limiting sliders are arranged in cooperation on the outer side wall of the receiving housing, and are respectively arranged in cooperation with the four limiting grooves.

[0011] Preferably, the inlet coarse filter assembly includes an inlet end cap, a coarse filter screen, and a first internal hexagonal retaining ring. The inlet end cap has an inlet flow channel that extends through both ends of the inlet end cap. One end of the inlet end cap is fitted onto one end of the protective housing and is threadedly connected to the protective housing. An inlet abutment ring is located at the end of the inlet end cap connected to the protective housing. One end of the inlet abutment ring is fixedly connected to the inlet end cap, and the other end of the inlet abutment ring is inserted into the mounting cavity and slidably engaged with the protective housing. The end of the inlet abutment ring located within the mounting cavity abuts against the end of the receiving housing. An inlet contact piece is fixedly installed within the inlet flow channel. The coarse filter screen and the first internal hexagonal retaining ring are fitted within the inlet flow channel and located on the side of the inlet contact piece away from the protective housing. One side of the coarse filter screen contacts the inlet contact piece and is slidably connected to the inner wall of the inlet flow channel. The first internal hexagonal retaining ring is threadedly connected to the inner wall of the inlet flow channel, and one side of the first internal hexagonal retaining ring contacts the other side of the coarse filter screen, used to fix the coarse filter screen within the inlet flow channel.

[0012] Preferably, an inlet spring is provided in the inlet flow channel. The inlet spring is located on the side of the inlet contact piece close to the protective shell. One end of the inlet spring contacts the inlet contact piece, and the other end contacts one end of the internal hexagonal locking ring in the blocking structure.

[0013] Preferably, the outlet fine filtration assembly includes an outlet end cap, a fine filter screen, and a second internal hexagonal retaining ring. The outlet end cap has an outlet flow channel that extends through both ends of the outlet end cap. One end of the outlet end cap is fitted onto the other end of the protective housing and is threadedly connected to the protective housing. An outlet abutment ring is located at the end of the outlet end cap connected to the protective housing. One end of the outlet abutment ring is fixedly connected to the outlet end cap, and the other end of the outlet abutment ring is inserted into the mounting cavity and slidably engaged with the protective housing. The end of the outlet abutment ring located within the mounting cavity abuts against the end of the receiving housing. An outlet contact piece is fixedly provided within the outlet flow channel. The fine filter screen and the second internal hexagonal retaining ring are fitted within the outlet flow channel and located on the side of the outlet contact piece away from the protective housing. One side of the fine filter screen contacts the outlet contact piece and is slidably connected to the inner wall of the outlet flow channel. The second internal hexagonal retaining ring is threadedly connected to the inner wall of the outlet flow channel, and one side of the second internal hexagonal retaining ring contacts the other side of the fine filter screen, used to fix the fine filter screen within the outlet flow channel.

[0014] Preferably, an outlet spring is provided in the outlet flow channel. The outlet spring is located on the side of the outlet contact piece close to the protective shell. One end of the outlet spring contacts the outlet contact piece, and the other end contacts one end of the internal hexagon locking ring in the blocking structure.

[0015] Preferably, the end of the inlet end cap away from the protective shell is provided with an inlet connecting pipe, one end of which is inserted into the inlet flow channel and threaded to the inner wall of the inlet flow channel, and the other end of which is fixedly provided with an inlet flange. The end of the outlet end cap away from the protective shell is provided with an outlet connecting pipe, one end of which is inserted into the outlet flow channel and threaded to the inner wall of the outlet flow channel, and the other end of which is fixedly provided with an outlet flange.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] This invention employs an inlet coarse filter assembly to initially filter the refrigerant, removing larger particulate impurities. The refrigerant then enters a drying assembly, where a drying medium within the containment chamber absorbs moisture. Simultaneously, blocking structures at both ends prevent leakage of the drying medium and ensure smooth refrigerant flow. Finally, a fine filter assembly at the outlet performs final filtration, removing minute impurities. In operation, this staged filtration design combining coarse and fine filtration meets the staged filtration requirements of LNG systems. The drying assembly features a sliding installation, and all components are detachable, greatly simplifying the replacement of the drying medium and component maintenance, significantly saving maintenance time. The compact overall structure effectively adapts to the installation and usage requirements of LNG liquefaction scenarios, solving the problems of current refrigerant filtration devices failing to meet the staged filtration needs of LNG systems and the cumbersome and time-consuming maintenance of the drying components, thus hindering their suitability for LNG liquefaction environments. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of an LNG liquefaction refrigerant drying and filtration device described in this embodiment of the utility model;

[0020] Figure 2 This is a partial exploded structural diagram of the protective shell and drying assembly described in this embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the structure of the imported coarse filter assembly described in this embodiment of the utility model;

[0022] Figure 4 This is an exploded structural diagram of the imported coarse filter assembly described in this embodiment of the utility model;

[0023] Figure 5 This is a schematic diagram of the structure of the outlet fine filter assembly described in the embodiment of this utility model;

[0024] Figure 6 This is an exploded view of the outlet fine filter assembly described in this embodiment of the present invention;

[0025] Figure 7 This is a cross-sectional structural schematic diagram of an LNG liquefaction refrigerant drying and filtration device as described in an embodiment of this utility model;

[0026] Explanation of reference numerals in the attached figures:

[0027] 10-Inlet coarse filter assembly, 11-Outlet fine filter assembly, 12-Protective housing, 13-Drying assembly, 14-Mounting cavity, 15-Receiving housing, 16-Blocking structure, 17-Receiving cavity, 18-Mounting groove, 19-Hexagon socket locking ring, 20-Blocking plate, 21-Flow hole, 22-Limiting slide groove, 23-Limiting slider, 24-Inlet end cap, 25-Coarse filter screen, 26-First hexagon socket retaining ring, 27-Inlet flow channel, 28-Inlet abutment ring, 29-Inlet contact plate, 30-Inlet spring, 31-Outlet end cap, 32-Fine filter screen, 33-Second hexagon socket retaining ring, 34-Outlet flow channel, 35-Outlet abutment ring, 36-Outlet contact plate, 37-Outlet spring, 38-Inlet connecting pipe, 39-Inlet flange, 40-Outlet connecting pipe, 41-Outlet flange. Detailed Implementation

[0028] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0029] In the description of the embodiments of this utility model, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0032] In this embodiment of the invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] The following disclosure provides many different implementations or examples for different structures of the embodiments of the present invention. To simplify the disclosure of the embodiments of the present invention, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the embodiments of the present invention. Furthermore, reference numerals and / or reference letters may be repeated in different examples of the embodiments of the present invention; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0034] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0035] Example:

[0036] like Figures 1 to 7As shown, this embodiment discloses an LNG liquefied refrigerant drying and filtration device, including an inlet coarse filter assembly 10, an outlet fine filter assembly 11, a protective shell 12, and a drying assembly 13. The protective shell 12 has a mounting cavity 14 penetrating both ends of the protective shell 12. The drying assembly 13 is disposed within the mounting cavity 14 and slidably connected to it. The inlet coarse filter assembly 10 and the outlet fine filter assembly 11 are respectively disposed at both ends of the protective shell 12, and are detachably connected to both ends of the protective shell 12, and are configured to cooperate with the mounting cavity 14 and the drying assembly 13. The drying assembly 13 is fixed inside the protective housing 12 and filters solid impurities in the refrigerant. The drying assembly 13 includes a housing 15 and a pair of blocking structures 16. The housing 15 has a cavity 17 extending through both ends of the housing 15. The cavity 17 is used to fill the drying medium. The pair of blocking structures 16 are respectively disposed at both ends of the cavity 17 and are detachably connected to the housing 15. The pair of blocking structures 16 are used to prevent the drying medium in the cavity 17 from leaking. The refrigerant can flow into the cavity 17 through one of the blocking structures 16 and out of the cavity 17 through the other blocking structure 16.

[0037] This invention employs an inlet coarse filter assembly 10 to initially filter the refrigerant, removing larger particulate impurities. The refrigerant then enters the drying assembly 13, where the drying medium within the receiving chamber 17 absorbs moisture. Simultaneously, the blocking structures 16 at both ends prevent leakage of the drying medium and ensure smooth refrigerant flow. Finally, the refrigerant undergoes fine filtration through the outlet fine filter assembly 11 to remove minute impurities. In use, this staged filtration design combining coarse and fine filtration meets the staged filtration requirements of LNG systems. The drying assembly 13 features a sliding installation, and all components are detachable, greatly simplifying the replacement of the drying medium and the maintenance of the assembly, significantly saving maintenance time. The overall structure is compact, effectively adapting to the installation and usage requirements of LNG liquefaction scenarios. This solves the problem that current refrigerant filtration devices struggle to meet the staged filtration needs of LNG systems, and that the maintenance of the drying components is cumbersome and time-consuming, making them unsuitable for LNG liquefaction scenarios.

[0038] To facilitate the accurate positioning and installation of the blocking structure 16, this embodiment is an improvement on the above embodiment. The difference from the above embodiment is that the two ends of the receiving cavity 17 are respectively provided with mounting grooves 18 for installing the blocking structure 16. The mounting grooves 18 are connected to the receiving cavity 17, and the blocking structure 16 is set in the mounting grooves 18 and is detachably connected to the receiving shell 15.

[0039] By providing mounting grooves 18 at both ends of the receiving cavity 17 to fit the blocking structure 16, precise installation positioning of the blocking structure 16 is ensured, guaranteeing a tight fit between it and the receiving cavity 17. The detachable connection design facilitates quick assembly and disassembly of the blocking structure 16, making it convenient to replace the drying medium and improving maintenance efficiency.

[0040] To further facilitate the accurate positioning and installation of the blocking structure 16, this embodiment is an improvement on the above embodiment. The difference from the above embodiment is that the blocking structure 16 includes an internal hexagonal locking ring 19 and a blocking plate 20. The blocking plate 20 is disposed in the mounting groove 18 and is slidably connected to the inner side wall of the mounting groove 18. The blocking plate 20 is configured to cooperate with the receiving cavity 17. The internal hexagonal locking ring 19 is disposed in the mounting groove 18 and is threadedly connected to the inner side wall of the mounting groove 18. One end of the internal hexagonal locking ring 19 abuts against the blocking plate 20 to fix the blocking plate 20 in the mounting groove 18. The blocking plate 20 is provided with a plurality of flow holes 21 for refrigerant to pass through.

[0041] The baffle plate 20 allows refrigerant to flow smoothly through the flow hole 21 while intercepting the drying medium to prevent leakage. The hexagonal locking ring 19 secures the baffle plate 20 with a threaded connection, ensuring stable and reliable flow of refrigerant under high pressure. The hexagonal design facilitates tool operation, and the threaded connection ensures sealing performance while simplifying the disassembly process, allowing for quick replacement of the baffle plate 20 or the drying medium. The grooves on the hexagonal locking ring 19 also facilitate the passage of refrigerant.

[0042] The drying medium can be activated alumina balls with a particle size range of 3-5 mm, or molecular sieves with a particle size range of 3-5 mm, such as 13X molecular sieve. The baffles 20 at both ends can be metal woven mesh with a pore size of 75 μm, such as stainless steel metal woven mesh.

[0043] To further facilitate the guidance and positioning of the drying assembly 13, this embodiment is an improvement on the above embodiment. The difference from the above embodiment is that the inner wall of the mounting cavity 14 is provided with a plurality of limiting grooves 22, and the outer wall of the housing 15 is fixedly provided with a plurality of limiting sliders 23 that cooperate with the plurality of limiting grooves 22. The plurality of limiting sliders 23 are respectively located in the plurality of limiting grooves 22 and are slidably connected to the limiting grooves 22.

[0044] The limiting groove 22 of the mounting cavity 14 cooperates with the limiting slider 23 that accommodates the housing 15 to provide guidance and positioning for the drying assembly 13, ensuring that it slides accurately into the mounting cavity 14 and preventing radial rotation.

[0045] In one embodiment, as a further preferred embodiment, there are four limiting grooves 22 and four limiting sliders 23. The four limiting grooves 22 are disposed on the inner side wall of the mounting cavity 14, and the four limiting sliders 23 are disposed on the outer side wall of the housing 15, and are respectively disposed in conjunction with the four limiting grooves 22.

[0046] The four sets of symmetrically arranged limiting grooves 22 and limiting sliders 23 further enhance the structural stability, effectively preventing the drying component 13 from shifting or vibrating under refrigerant impact, while simplifying the alignment operation during installation.

[0047] To facilitate the installation of the inlet coarse filter assembly 10, this embodiment is an improvement upon the above embodiment. The difference lies in that the inlet coarse filter assembly 10 includes an inlet end cap 24, a coarse filter screen 25, and a first internal hexagonal retaining ring 26. The inlet end cap 24 has an inlet flow channel 27 that extends through both ends of the inlet end cap 24. One end of the inlet end cap 24 is fitted onto one end of the protective housing 12 and is threadedly connected to the protective housing 12. An inlet abutment ring 28 is provided at the end of the inlet end cap 24 connected to the protective housing 12. One end of the inlet abutment ring 28 is fixedly connected to the inlet end cap 24, and the other end of the inlet abutment ring 28 is inserted into the mounting cavity 14 and... The protective housing 12 is slidably fitted. The end of the inlet abutment ring 28 located inside the mounting cavity 14 abuts against the end of the receiving housing 15. An inlet contact piece 29 is fixedly provided inside the inlet flow channel 27. The coarse filter 25 and the first internal hexagonal fixing ring 26 are fitted inside the inlet flow channel 27 and are located on the side of the inlet contact piece 29 away from the protective housing 12. One side of the coarse filter 25 contacts the inlet contact piece 29 and is slidably connected to the inner wall of the inlet flow channel 27. The first internal hexagonal fixing ring 26 is threadedly connected to the inner wall of the inlet flow channel 27. One side of the first internal hexagonal fixing ring 26 contacts the other side of the coarse filter 25 to fix the coarse filter 25 inside the inlet flow channel 27.

[0048] The inlet end cap 24 is connected to the protective housing 12 via threads, and the inlet abutment ring 28 directly abuts against the end of the receiving housing 15 for axial fixation. The coarse filter screen 25 is pressed into the inlet flow channel 27 by the first internal hexagonal retaining ring 26 to perform preliminary filtration of the refrigerant and remove large particulate impurities. The groove of the first internal hexagonal retaining ring 26 itself facilitates the passage of refrigerant. The threaded connection facilitates disassembly and maintenance, and the internal hexagonal retaining ring design makes it easy to replace the coarse filter screen 25. The sliding fit between the inlet abutment ring 28 and the housing ensures installation concentricity and improves overall sealing. The coarse filter screen 25 can be made of metal woven mesh, such as stainless steel woven mesh, and has several coarse filter holes with a pore size range of 80-100μm, which can be set according to actual needs.

[0049] As a further preferred embodiment, an inlet spring 30 is provided in the inlet channel 27. The inlet spring 30 is located on the side of the inlet contact piece 29 close to the protective housing 12. One end of the inlet spring 30 contacts the inlet contact piece 29, and the other end contacts one end of the internal hexagon locking ring 19 in the blocking structure 16.

[0050] The imported spring 30 forms an elastic support between the imported contact plate 29 and the internal hexagonal locking ring 19, which can not only buffer the impact generated by the refrigerant flow on the inlet side, but also apply pre-tightening force to the drying assembly 13. During disassembly, it can also provide elasticity to facilitate the disassembly of the drying assembly 13.

[0051] To facilitate the installation of the coarse filter assembly, this embodiment is an improvement upon the above embodiment. The difference lies in that the fine filter assembly 11 includes an outlet end cap 31, a fine filter screen 32, and a second internal hexagonal retaining ring 33. The outlet end cap 31 has an outlet flow channel 34 that extends through both ends. One end of the outlet end cap 31 is fitted onto the other end of the protective housing 12 and is threadedly connected to it. An outlet abutment ring 35 is provided at the end of the outlet end cap 31 connected to the protective housing 12. One end of the outlet abutment ring 35 is fixedly connected to the outlet end cap 31, and the other end of the outlet abutment ring 35 is inserted into the mounting cavity 14 and... The protective housing 12 is slidably fitted. The end of the outlet abutment ring 35 located inside the mounting cavity 14 abuts against the end of the receiving housing 15. An outlet contact piece 36 is fixedly provided inside the outlet flow channel 34. The fine filter screen 32 and the second internal hexagonal fixing ring 33 are fitted and disposed inside the outlet flow channel 34, and are located on the side of the outlet contact piece 36 away from the protective housing 12. One side of the fine filter screen 32 contacts the outlet contact piece 36 and is slidably connected to the inner wall of the outlet flow channel 34. The second internal hexagonal fixing ring 33 is threadedly connected to the inner wall of the outlet flow channel 34. One side of the second internal hexagonal fixing ring 33 contacts the other side of the fine filter screen 32, which is used to fix the fine filter screen 32 inside the outlet flow channel 34.

[0052] Similar in structure to the imported coarse filter assembly 10, the fine filter screen 32 performs secondary fine filtration on the dried refrigerant, removing minute impurities to meet the high-precision cleanliness requirements of the LNG system. The staged filtration design significantly improves the filtration effect and is suitable for the harsh operating conditions of LNG liquefaction scenarios. The slots on the second internal hexagonal retaining ring 33 facilitate the passage of refrigerant. The fine filter screen 32 can be made of existing metal woven mesh, such as stainless steel woven mesh. The fine filter screen 32 has several fine filter holes with a pore size range of 10-20μm, which can be set according to actual needs.

[0053] As a further preferred embodiment, an outlet spring 37 is provided in the outlet channel 34. The outlet spring 37 is located on the side of the outlet contact piece 36 near the protective housing 12. One end of the outlet spring 37 contacts the outlet contact piece 36, and the other end contacts one end of the internal hexagon locking ring 19 in the blocking structure 16.

[0054] Similar to the imported spring 30, it ensures the axial positioning stability of the drying component 13 through elastic pre-tensioning, while buffering pressure fluctuations on the outlet side, reducing component vibration and wear, and extending service life. It can also provide elasticity during disassembly to facilitate the disassembly of the drying component 13.

[0055] To facilitate the connection of this utility model with the LNG system, this embodiment is an improvement on the above embodiment. The difference from the above embodiment is that the end of the inlet end cap 24 away from the protective shell 12 is provided with an inlet connecting pipe 38. One end of the inlet connecting pipe 38 is inserted into the inlet flow channel 27 and is threaded to the inner side wall of the inlet flow channel 27. The other end of the inlet connecting pipe 38 is fixedly provided with an inlet flange 39. The end of the outlet end cap 31 away from the protective shell 12 is provided with an outlet connecting pipe 40. One end of the outlet connecting pipe 40 is inserted into the outlet flow channel 34 and is threaded to the inner side wall of the outlet flow channel 34. The other end of the outlet connecting pipe 40 is fixedly provided with an outlet flange 41.

[0056] The connecting pipe is threaded into the flow channel in the end cap, and the flange facilitates quick docking with external piping systems. The threaded connection allows for the disassembly and replacement of the connecting pipe, adapting to different pipe diameter requirements; the flange connection ensures sealing reliability under low temperature and high pressure environments, improves the compatibility of the unit with the LNG system, and simplifies the on-site installation process.

[0057] In one embodiment, the barrier plate 20 and the housing 15, the coarse filter plate 25 and the inlet contact plate 29, and the fine filter plate 32 and the outlet contact plate 36 are all sealed with low-temperature resistant gaskets from the prior art. Similarly, the inlet end cap 24, the outlet end cap 31 and the protective housing 12, the inlet abutment ring 28 and the housing 15, and the outlet abutment ring 35 and the housing 15 are also sealed with low-temperature resistant gaskets from the prior art. The gaskets can be perfluoroether rubber gaskets from the prior art; they are simply placed at the contact points for sealing, and at least one gasket is used. The gaskets are embedded, i.e., a sealing groove is provided on the contact surface, and the gasket is embedded in the sealing groove. Additionally, the sealing performance of threaded connections can be further enhanced by wrapping sealing tape during connection.

[0058] Working principle of this utility model:

[0059] This invention employs an inlet coarse filter assembly 10 to initially filter the refrigerant, removing larger particulate impurities. The refrigerant then enters the drying assembly 13, where the drying medium within the receiving cavity 17 absorbs moisture. Simultaneously, the blocking structures 16 at both ends prevent leakage of the drying medium and ensure smooth refrigerant flow. Finally, the refrigerant undergoes fine filtration through the outlet fine filter assembly 11 to remove minute impurities. In use, this staged filtration design combining coarse and fine filtration meets the staged filtration requirements of LNG systems. The drying assembly 13 features a sliding installation, and all components are detachable, greatly simplifying the replacement of the drying medium and the maintenance of the assembly, significantly saving maintenance time. The overall structure is compact and effectively adapts to the installation and usage requirements of LNG liquefaction scenarios.

[0060] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0061] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An LNG liquefied refrigerant drying filter device characterized by, The system includes an inlet coarse filter assembly (10), an outlet fine filter assembly (11), a protective housing (12), and a drying assembly (13). The protective housing (12) has a mounting cavity (14) extending through both ends of the housing. The drying assembly (13) is located within the mounting cavity (14) and is slidably connected to it. The inlet coarse filter assembly (10) and the outlet fine filter assembly (11) are respectively located at both ends of the protective housing (12). The inlet coarse filter assembly (10) and the outlet fine filter assembly (11) are detachably connected to both ends of the protective housing (12) and are configured to cooperate with the mounting cavity (14) and the drying assembly (13) to fix the drying assembly (13) within the housing. The dryer assembly (13) includes a housing (15) and a pair of blocking structures (16). The housing (15) has a cavity (17) extending through both ends of the housing (15). The cavity (17) is used to fill the drying medium. The pair of blocking structures (16) are respectively located at both ends of the cavity (17) and are detachably connected to the housing (15). The pair of blocking structures (16) are used to prevent the drying medium in the cavity (17) from leaking. The refrigerant can flow into the cavity (17) through one of the blocking structures (16) and out of the cavity (17) through the other blocking structure (16).

2. The LNG liquefied refrigerant drying filter device according to claim 1, characterized by, The cavity (17) has mounting grooves (18) at both ends for mounting the blocking structure (16). The mounting grooves (18) are connected to the cavity (17). The blocking structure (16) is set in the mounting grooves (18) and is detachably connected to the housing (15).

3. The LNG liquefied refrigerant drying filter device according to claim 2, characterized by, The blocking structure (16) includes an internal hexagonal locking ring (19) and a blocking plate (20). The blocking plate (20) is disposed in the mounting groove (18) and is slidably connected to the inner wall of the mounting groove (18). The blocking plate (20) is fitted with the receiving cavity (17). The internal hexagonal locking ring (19) is disposed in the mounting groove (18) and is threadedly connected to the inner wall of the mounting groove (18). One end of the internal hexagonal locking ring (19) abuts against the blocking plate (20) to fix the blocking plate (20) in the mounting groove (18). The blocking plate (20) is provided with several flow holes (21) for refrigerant to pass through.

4. The LNG liquefied refrigerant drying filter device according to claim 3, characterized by, The inner wall of the mounting cavity (14) is provided with several limiting grooves (22), and the outer wall of the housing (15) is fixedly provided with several limiting sliders (23) that cooperate with the several limiting grooves (22). The several limiting sliders (23) are respectively located in the several limiting grooves (22) and are slidably connected with the limiting grooves (22).

5. The LNG liquefied refrigerant drying filter device according to claim 4, characterized by, There are four limiting grooves (22) and four limiting sliders (23). The four limiting grooves (22) are fitted on the inner side wall of the mounting cavity (14), and the four limiting sliders (23) are fitted on the outer side wall of the housing (15), and are respectively fitted with the four limiting grooves (22).

6. The LNG liquefied refrigerant drying filter device according to claim 5, characterized by The inlet coarse filter assembly (10) includes an inlet end cap (24), a coarse filter screen (25), and a first internal hexagonal retaining ring (26). The inlet end cap (24) has an inlet flow channel (27) that runs through both ends of the inlet end cap (24). One end of the inlet end cap (24) is fitted onto one end of the protective shell (12) and is threadedly connected to the protective shell (12). An inlet abutment ring (28) is provided in the end of the inlet end cap (24) that is connected to the protective shell (12). One end of the inlet abutment ring (28) is fixedly connected to the inlet end cap (24), and the other end of the inlet abutment ring (28) is inserted into the mounting cavity (14) and slides against the protective shell (12). The inlet abutment ring (28) is located in the mounting cavity. One end of the cavity (14) abuts against one end of the housing (15). An inlet contact piece (29) is fixedly provided in the inlet channel (27). A coarse filter (25) and a first internal hexagonal fixing ring (26) are fitted in the inlet channel (27) and located on the side of the inlet contact piece (29) away from the protective housing (12). One side of the coarse filter (25) contacts the inlet contact piece (29) and is slidably connected to the inner wall of the inlet channel (27). The first internal hexagonal fixing ring (26) is threadedly connected to the inner wall of the inlet channel (27). One side of the first internal hexagonal fixing ring (26) contacts the other side of the coarse filter (25) to fix the coarse filter (25) in the inlet channel (27).

7. The LNG liquefaction refrigerant drying and filtering device according to claim 6, characterized in that, An inlet spring (30) is provided in the inlet flow channel (27). The inlet spring (30) is located on the side of the inlet contact piece (29) close to the protective shell (12). One end of the inlet spring (30) contacts the inlet contact piece (29), and the other end contacts one end of the internal hexagonal locking ring (19) in the blocking structure (16).

8. The LNG liquefaction refrigerant drying and filtering device according to claim 7, characterized in that, The outlet fine filter assembly (11) includes an outlet end cap (31), a fine filter screen (32), and a second internal hexagonal retaining ring (33). An outlet flow channel (34) is provided inside the outlet end cap (31), extending through both ends of the outlet end cap (31). One end of the outlet end cap (31) is fitted onto the other end of the protective housing (12) and is threadedly connected to the protective housing (12). An outlet abutment ring (35) is provided inside the end of the outlet end cap (31) connected to the protective housing (12). One end of the outlet abutment ring (35) is fixedly connected to the outlet end cap (31), and the other end of the outlet abutment ring (35) is inserted into the mounting cavity (14) and slides against the protective housing (12). The outlet abutment ring (35) is located within the mounting cavity. One end of the cavity (14) abuts against the end of the housing (15). An outlet contact piece (36) is fixedly provided in the outlet flow channel (34). The fine filter screen (32) and the second internal hexagonal fixing ring (33) are fitted in the outlet flow channel (34) and located on the side of the outlet contact piece (36) away from the protective housing (12). One side of the fine filter screen (32) contacts the outlet contact piece (36) and is slidably connected to the inner wall of the outlet flow channel (34). The second internal hexagonal fixing ring (33) is threadedly connected to the inner wall of the outlet flow channel (34). One side of the second internal hexagonal fixing ring (33) contacts the other side of the fine filter screen (32) to fix the fine filter screen (32) in the outlet flow channel (34).

9. The LNG liquefaction refrigerant drying and filtering device according to claim 8, characterized in that, An outlet spring (37) is provided in the outlet flow channel (34). The outlet spring (37) is located on the side of the outlet contact piece (36) close to the protective shell (12). One end of the outlet spring (37) contacts the outlet contact piece (36), and the other end contacts one end of the internal hexagonal locking ring (19) in the blocking structure (16).

10. An LNG liquefaction refrigerant drying and filtering device according to claim 9, characterized in that, An inlet connecting pipe (38) is provided at the end of the inlet end cap (24) away from the protective shell (12). One end of the inlet connecting pipe (38) is inserted into the inlet flow channel (27) and threaded to the inner wall of the inlet flow channel (27). An inlet flange (39) is fixedly provided at the other end of the inlet connecting pipe (38). An outlet connecting pipe (40) is provided at the end of the outlet end cap (31) away from the protective shell (12). One end of the outlet connecting pipe (40) is inserted into the outlet flow channel (34) and threaded to the inner wall of the outlet flow channel (34). An outlet flange (41) is fixedly provided at the other end of the outlet connecting pipe (40).

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