Low-temperature storage tank molecular sieve filling device

Abstract

The application provides a low-temperature storage tank molecular sieve filling device, which comprises a container assembly, an upper cover assembly installed at a feeding port of the container assembly, a discharging pipe system connected with a discharging port of the container assembly, and a purging pipe system; two independent storage cavities and a discharging cavity below the storage cavities are arranged in the container assembly, a discharging pipe is connected with the two storage cavities, a feeding switch assembly is connected with the discharging pipe, the outlets of the two storage cavities can be simultaneously closed or opened at different times by operating the feeding switch assembly, a pull valve capable of being connected with a molecular sieve filling port of a low-temperature storage tank is arranged at an outlet end of the discharging pipe system, and inert gas conveyed by the purging pipe system can enter the discharging cavity through the storage cavities. The application can break the vacuum of the interlayer of the storage tank by nitrogen, the molecular sieve and the expanded perlite are in a nitrogen environment during the filling process, the contact with air is reduced, the adsorption capacity of the molecular sieve is stable, the vacuum extraction efficiency in the later stage is improved, and the heat preservation performance is effectively guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of molecular sieve filling technology, and specifically relates to a molecular sieve filling device for a cryogenic storage tank. Background Technology

[0002] With the continuous development of my country's cryogenic industry chain, the cryogenic liquid market is booming. Sales of liquid oxygen, liquid argon, liquid nitrogen, liquid carbon dioxide, and LNG have increased significantly. The production, storage, and transportation of cryogenic liquids are inseparable from insulated containers. Currently, vacuum-insulated pressure vessels are generally divided into two types: mobile cryogenic storage tanks and stationary cryogenic storage tanks. Insulation methods are generally divided into three types: vacuum powder insulation, high-vacuum multilayer insulation, and vacuum composite insulation. Vacuum powder insulation cryogenic storage tanks have interlayers filled with expanded perlite and evacuated to a vacuum state to achieve insulation and cold preservation. This type of cryogenic storage tank is simple to manufacture, has a short production cycle, and is widely used.

[0003] To ensure effective thermal insulation, after the cryogenic storage tank is filled with expanded perlite and the tank's interlayer is evacuated to a vacuum state, a molecular sieve filling process is required. For example... Figure 1 As shown, the cryogenic storage tank has a storage tank interlayer (03) formed by an inner container assembly (01) and an outer shell assembly (02). The storage tank interlayer (03) is an interlayer space. After the storage tank interlayer (03) is filled with expanded pearl (04), the storage tank outer shell (02) is sealed as a whole. The filling tool (05) is connected to the connecting pipe of the molecular sieve device (06), and the storage tank interlayer (03) is evacuated by the vacuum pump group (09). After the vacuum degree is evacuated to 10 Pa, the molecular sieve (08) filling process is carried out on the storage tank interlayer (03) by the filling tool (05).

[0004] The molecular sieve is typically composed of two types, molecular sieve 5A and molecular sieve 13X, in a 3:1 ratio. Before filling, both types of molecular sieves are sealed in a sealed container. After being unsealed from the sealed container, the two types of molecular sieves are placed into the container (07) according to their volume ratio (since the two types of molecular sieves adsorb different types of gases, they do not affect each other, and both are connected to the interlayer space in the storage tank, so there is no need to mix the two types of molecular sieves). The valve on the filling fixture (05) is opened, and the molecular sieve (08) is filled into the molecular sieve device (06) in the interlayer of the storage tank (03) through the pressure difference between the interlayer of the storage tank (03) and the outside world using air. After the molecular sieve filling is completed, the filling fixture (05) is removed and the filling port is welded and sealed. Finally, the interlayer of the storage tank (03) is evacuated.

[0005] In the existing technology, when filling the cryogenic storage tank with molecular sieve, the vacuum state of the storage tank interlayer (03) is broken by atmospheric pressure, and the molecular sieve and expanded perlite are fully in contact with the air. Because the molecular sieve and expanded perlite have a strong adsorption capacity under standard conditions, the expanded perlite in the storage tank interlayer (03) adsorbs a large amount of water vapor and other gases. In addition, because the barrel (07) is not sealed with a sealing sleeve, the molecular sieve in the barrel (07) is not effectively sealed, and the adsorption capacity of the molecular sieve is greatly reduced. This reduces the efficiency and quality of subsequent vacuuming of the storage tank interlayer (03), and the vacuum level rises rapidly during the use of the cryogenic storage tank, reducing the insulation performance and affecting its use. Summary of the Invention

[0006] The present invention aims to solve the technical problems existing in the prior art, and the purpose of the present invention is to provide a molecular sieve filling device for cryogenic storage tanks.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a molecular sieve filling device for a cryogenic storage tank, comprising a container assembly capable of accommodating two types of molecular sieves, an openable and closable top cover assembly installed at the inlet of the container assembly, a metering device for measuring the amount of the two types of molecular sieves fed into the container assembly, a discharge pipe system connected to the outlet of the container assembly, and a purging pipe system connected to an inert gas supply device for supplying inert gas into the container assembly; the container assembly is provided with two independent storage chambers communicating with the inlet, and a discharge chamber located below the two storage chambers communicating with the outlet; the outlets of the two storage chambers are connected to a common discharge pipe extending into the storage chamber, and the discharge pipe is connected to... The feeding switch assembly allows the outlets of the two storage chambers to be closed simultaneously or opened at different times. The outlet end of the discharge pipe system is equipped with a pull valve that can be connected to the molecular sieve filling port of the cryogenic storage tank. By operating the valve handle, the molecular sieve filling port can be closed or opened. The container assembly is also equipped with an air inlet communicating with the storage chamber and an air outlet communicating with the discharge chamber. The purging pipe system includes an air inlet valve at the air inlet, an air outlet valve at the air outlet, and a purging pipe with several air outlet holes located in the container assembly. The inlet of the purging pipe is connected to the air inlet valve, which is connected to the inert gas supply device. The inert gas transported by the purging pipe can enter the discharge chamber through the storage chamber.

[0008] The above technical solution uses nitrogen to break the vacuum in the tank jacket. The molecular sieve and expanded perlite are in a nitrogen environment during the filling process, which reduces the contact between the expanded perlite and air, improves the efficiency of vacuuming in the later stage, and reduces the time investment in the manufacturing process. Moreover, the nitrogen replacement of the container components through the purging pipe system and the nitrogen sealing of the molecular sieve prevent air from contacting the molecular sieve. The adsorption capacity of the molecular sieve is stable, which effectively ensures the insulation performance of the cryogenic storage tank and avoids the problem of a large rebound in vacuum degree and a sharp decline in insulation performance during use.

[0009] In a preferred embodiment of the present invention, a feed funnel is rotatably connected to the feed inlet. By rotating the feed funnel, the outlet of the feed funnel can be connected to the inlet of the two storage chambers at different times.

[0010] The above technical solution, by setting up a feed funnel, allows the two types of molecular sieve packings to be separated and not mixed when fed through a single feed inlet, which is beneficial for the feeding of the two types of molecular sieves.

[0011] In a preferred embodiment of the present invention, the top cover assembly includes a flange seat with a through hole in the middle, which is arranged around the feed inlet; a flange cover for closing the through hole of the flange seat, which is rotatably connected to the flange seat by a first pin; and a fastening assembly for fastening the flange cover.

[0012] In the above technical solution, the upper cover assembly is a flip-top structure, and the flange cover is fixed by a fastening component, which enables the upper cover assembly to withstand pressure.

[0013] In a preferred embodiment of the present invention, the outer wall of the flange cover has at least one circumferentially spaced notch, and a seat body corresponding to each notch is fixedly connected to the outside of the feed port. The fastening assembly includes a screw rod rotatably connected to the seat body via a second pin and a nut threadedly connected to the screw rod. The screw rod can be inserted into or disengaged from the notch, and the lower end of the nut can abut against the upper end of the flange cover to press the flange cover.

[0014] The above technical solution, by setting a notch, a seat, a screw and a nut, allows the flange cover to be released by loosening the nut and rotating the screw outward, thus enabling the quick opening of the upper cover assembly.

[0015] In a preferred embodiment of the present invention, the purging pipe is disposed in the storage chamber and is coiled in multiple loops along the height direction on the inner wall of the storage chamber, and the bottom of the storage chamber is provided with a vent hole.

[0016] The above technical solution involves multiple coils of purging pipes around the inner wall of the storage chamber, allowing nitrogen to quickly reach all parts of the storage chamber and facilitate the rapid replacement of air within the container components.

[0017] In another preferred embodiment of the present invention, the feeding switch assembly includes a valve body mounted on the side wall of the container assembly, a transmission rod connected to the valve body and extending into the container assembly, a hemisphere fixed to the transmission rod and rotatably mounted in the feeding pipe capable of closing the feeding pipe, and a handle fixed to the transmission rod and located outside the container assembly; by rotating the handle, the hemisphere can simultaneously close the outlets of two storage chambers or open the outlet of one of the storage chambers at different times.

[0018] The above technical solution uses a hemisphere that is half the size of a sphere. This hemisphere can simultaneously close the outlets of two storage chambers or open the outlet of one of the storage chambers at different times, ensuring the storage and discharge of materials. Moreover, the hemisphere can prevent the outlets of two storage chambers from opening at the same time, thus providing a fault-prevention function. Power is transmitted through a transmission rod, and the hemisphere can be rotated by operating a handle outside the container assembly, making operation convenient.

[0019] In another preferred embodiment of the invention, the metering device includes a sight glass disposed on the side wall of the container assembly. The sight glass has a viewing window and a metering scale, through which the interior of the two storage chambers can be observed.

[0020] The above technical solution allows you to observe the height of the top of the molecular sieve in the storage chamber through a sight glass and compare it with the metering scale to determine the volume of the molecular sieve entering the storage chamber. It has a simple structure and low cost.

[0021] In another preferred embodiment of the present invention, the discharge pipe system includes a discharge pipe connected to the discharge port and extending out of the bottom of the discharge chamber. The outlet end of the discharge pipe is connected to a discharge valve, and the outlet end of the discharge valve is connected to a vacuum hose. The pull valve is a vacuum pull valve, and the vacuum hose is fixedly connected to the vacuum pull valve by a vacuum clamp.

[0022] The above technical solution uses a discharge valve to seal the discharge pipe and discharge port, and a vacuum hose and pull valve to facilitate the connection of the filling device with the molecular sieve filling port of the cryogenic storage tank. The vacuum hose is a flexible hose and is not limited by site or location.

[0023] In another preferred embodiment of the present invention, the container assembly includes a cylindrical body, a conical funnel disposed in the cylindrical body, and a vertically extending partition. The inlet and outlet are disposed on the cylindrical body. The upper end of the partition extends to the inlet, and the lower end of the partition extends to the outlet of the conical funnel. The outlet at the bottom of the conical funnel is connected to a discharge pipe. The partition divides the conical funnel into two storage chambers.

[0024] The above technical solution divides the conical funnel into two storage chambers with a partition, which is simple in structure and the structure of the conical funnel facilitates smooth material discharge from the storage chambers.

[0025] In another preferred embodiment of the present invention, the pull valve includes a valve seat connected to the outlet end of the discharge pipe system, the end of the valve seat is detachably and sealingly connected to a tube seat that can be connected to the molecular sieve filling port, the tube seat is detachably and sealingly connected to a valve plate for closing the tube seat port, and a pull rod slidably connected to the valve plate is detachably connected to the valve seat, the end of the pull rod away from the valve plate is fixedly connected to the valve handle.

[0026] The above technical solution, by pulling the lever, opens and closes the valve plate and the pipe seat, thus achieving the function of series packing. The operation is simple. Moreover, the pipe seat and valve seat are detachably connected, the valve plate and the pipe seat are detachably connected, and the valve plate and the lever are detachably connected. This allows the pipe seat and valve plate to be removed from the lever and connected to the molecular sieve filling port of the cryogenic storage tank without affecting the filling of expanded perlite and vacuuming of the cryogenic storage tank.

[0027] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0029] Figure 1 This is a schematic diagram of the structure of filling cryogenic storage tanks with molecular sieves using existing technology.

[0030] Figure 2 This is a schematic diagram of the structure of the molecular sieve filling device for the cryogenic storage tank in this embodiment.

[0031] Figure 3 This is a front cross-sectional schematic diagram of the molecular sieve filling device for a cryogenic storage tank according to an embodiment.

[0032] Figure 4 This is a schematic diagram of the connection between the quick-opening flange assembly and the neck assembly in the embodiment.

[0033] Figure 5 yes Figure 2 A magnified view of part A in the diagram.

[0034] Figure 6 yes Figure 4 A three-dimensional structural diagram of the feed funnel.

[0035] Figure 7 This is a cross-sectional view of the container component in the embodiment.

[0036] Figure 8 This is a schematic diagram of the purge intake pipe system in the embodiment.

[0037] Figure 9 This is a schematic diagram of the feeding switch assembly in the embodiment.

[0038] Figure 10 This is a schematic diagram of the structure of the viewing mirror in the embodiment.

[0039] Figure 11 This is a schematic diagram of the discharge pipe system in the embodiment.

[0040] Figure 12yes Figure 11 A schematic diagram of the pull valve in the diagram.

[0041] The reference numerals in the accompanying drawings include: inner container assembly 01, outer shell assembly 02, tank jacket 03, expanded pearl 04, filling fixture 05, molecular sieve device 06, barrel 07, molecular sieve 08, vacuum pump assembly 09, top cover assembly 1, first stiffener 11, first pin 12, second stiffener 13, seat 14, flange seat 15, sealing gasket 16, flange cover 17, notch 171, fastening assembly 18, screw 181, nut 182, second pin 19, neck tube 2, feed funnel 21, hanging lug 211, hanging ring 22, wing plate 221, container assembly 3, top end cap 31, cylinder 32, partition 33, conical funnel 34. Vent hole 35, feed pipe 36, bottom end cap 37, storage chamber 38, discharge chamber 39, purging pipe system 4, air inlet valve 41, purging pipe 42, air outlet 421, air valve 43, support 5, caster 51, feed switch assembly 6, handle 61, valve body 62, transmission rod 63, bearing 64, hemisphere 65, metering device (sight glass) 7, viewing window 71, metering scale 72, discharge pipe system 8, pull valve 81, valve handle 811, pull rod 812, slip nut 813, valve plate 814, pipe seat 815, valve seat 816, sealing ring 817, vacuum clamp 82, vacuum hose 83, discharge pipe 84, discharge valve 85, hanger 9. Detailed Implementation

[0042] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0043] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "vertical", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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 this invention.

[0044] In the description of this invention, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0045] This invention provides a molecular sieve filling device for cryogenic storage tanks, such as... Figure 2 and Figure 3 As shown, in a preferred embodiment, the filling device includes a container assembly 3 capable of accommodating two molecular sieves, an openable and closable top cover assembly 1 installed at the feed inlet on the top of the container assembly 3, a metering device 7 for measuring the amount of the two molecular sieves fed into the container assembly 3, a discharge pipe system 8 connected to the discharge outlet of the container assembly 3, and a purging pipe system 4 connected to an inert gas supply device for supplying inert gas (such as nitrogen) into the container assembly 3.

[0046] The container assembly 3 includes two independent storage chambers 38 connected to its inlet and a discharge chamber 39 located below them and connected to its outlet. The outlets of the two storage chambers 38 are connected to a discharge pipe 36 extending downwards into each chamber. The discharge pipe 36 is connected to a feed switch assembly 6. By operating the feed switch assembly 6, the outlets of the two storage chambers 38 can be simultaneously closed or one of the outlets can be opened at different times. The outlet end of the discharge pipe system 8 is equipped with a pull valve 81 that can connect to the molecular sieve filling port of the cryogenic storage tank. By operating the valve handle 811 of the pull valve 81, the molecular sieve filling port can be closed or opened.

[0047] like Figure 2 and Figure 3 As shown, the container assembly 3 is also provided with an air inlet communicating with the storage chamber 38 and an air outlet communicating with the discharge chamber 39, combined with Figure 8 As shown, the purge system 4 includes an inlet valve 41 at the inlet, an outlet valve 43 at the outlet, and a purge pipe 42 with several outlet holes 421 located in the container assembly 3. The outlet holes 421 can be through holes of φ2mm, smaller than the diameter of the molecular sieve, and can only discharge gas. Both the inlet valve 41 and the outlet valve 43 are ball valves. The inlet of the purge pipe 42 is connected to the inlet valve 41. The inlet valve 41 is connected to the inert gas supply device (not shown in the figure). The inert gas transported by the purge pipe 42 can enter the discharge chamber 39 through the storage chamber 38.

[0048] like Figure 3 and Figure 8 As shown, preferably, the purging pipe 42 is located in the storage chamber 38 and is coiled in multiple loops along the height direction on the inner wall of the storage chamber 38. For example, the purging pipe 42 is divided into two parallel groups, left and right, and the two groups of purging pipes 42 are located in two storage chambers 38 respectively. The bottom of the storage chamber 38 is provided with several vent holes 35 so that the gas in the storage chamber 38 can be discharged into the discharge chamber 39.

[0049] like Figure 3 and Figure 7As shown, in one embodiment, the container assembly 3 includes a cylindrical body 32, a conical funnel 34 disposed within the cylindrical body 32, and a vertically extending partition 33. The top of the cylindrical body 32 is an upwardly protruding arc-shaped top end cap 31, and the bottom of the cylindrical body 32 is a downwardly recessed arc-shaped bottom end cap 37. The inlet of the container assembly 3 is located at the top of the top end cap 31 of the cylindrical body 32, and the outlet of the container assembly 3 is located on the circular side wall of the cylindrical body 32, close to the bottom end cap 37. The upper end of the partition 33 extends to the inlet of the container assembly 3, and the lower end of the partition 33 extends to the outlet at the bottom of the conical funnel 34. The outlet at the bottom of the conical funnel 34 is connected to the discharge pipe 36, and the partition 33 divides the conical funnel 34 into two storage chambers 38, left and right. The vent 35 is located at the bottom of the conical funnel 34. For example, several through holes with a diameter of φ2mm are set at the bottom of the conical funnel 34, which are smaller than the diameter of the molecular sieve and can only allow air to pass through.

[0050] Preferably, such as Figure 2 As shown, the container assembly 3 is mounted on a support 5 with casters 51. For example, the outer wall of the container assembly 3 cylinder 32 is welded to the support 5, and the support 5 supports the container assembly 3, making it easy to move the molecular sieve filling device.

[0051] like Figures 2-4 As shown, in another preferred embodiment, a feed funnel 21 is rotatably connected to the feed inlet of the container assembly 3. By rotating the feed funnel 21, the outlet of the feed funnel 21 can be connected to the inlets of the two storage chambers 38 at different times. Preferably, an upwardly extending neck tube 2 is welded at the feed inlet of the container assembly 3. The feed funnel 21 is rotatably installed in the neck tube 2, and the top cover assembly 1 is installed on the neck tube 2. The feed inlet of the container assembly 3 is closed by sealing the opening at the upper end of the neck tube 2.

[0052] like Figure 4 and Figure 6 As shown, the specific connection between the feed funnel 21 and the neck tube 2 is as follows: an annular hanging ring 22 is fixedly connected to the inner wall of the neck tube 2. The hanging ring 22 has an upwardly extending wing plate 221. The top of the feed funnel 21 has an outwardly and downwardly extending lug 211. The lug 211 of the feed funnel 21 is hung on the wing plate 221 of the hanging ring 22 and can slide circumferentially on the wing plate 221. The feed funnel 21 includes an arc-shaped sidewall and a downwardly inclined bottom fixed to the lower end of the sidewall. The outlet of the feed funnel 21 is located on the opposite side of its sidewall.

[0053] like Figure 3As shown, when a molecular sieve (such as molecular sieve 5A) needs to be added to the left storage chamber 38, the upper cover assembly 1 is opened, and the feed funnel 21 is rotated to the right. The outlet of the feed funnel 21 faces left and extends to the top of the left storage chamber 38. Molecular sieve 5A is poured into the neck tube 2. Under the guidance of the feed funnel 21, molecular sieve 5A can only enter the left storage chamber 38. When another molecular sieve (such as molecular sieve 13A) needs to be added to the right storage chamber 38, the feed funnel 21 is rotated circumferentially to the left in the neck tube 2. The outlet of the feed funnel 21 faces right and extends to the top of the right storage chamber 38. Molecular sieve 13A is poured into the neck tube 2. Under the guidance of the feed funnel 21, molecular sieve 13A can only enter the right storage chamber 38, thus achieving separation and non-mixing of the two molecular sieve packings.

[0054] like Figure 4 As shown, in this invention, the upper cover assembly 1 includes a flange seat 15 with a through hole in the middle, which is arranged around the neck tube 2 at the feed inlet; a flange cover 17 for closing the through hole of the flange seat 15, which is rotatably connected to the flange seat 15 by a first pin 12; and a fastening assembly 18 for fastening the flange cover 17. Preferably, a sealing gasket 16 is provided between the upper surface of the flange seat 15 and the lower surface of the flange cover 17. A first stiffening plate 11 is welded to the left end of the flange cover 17, and a second stiffening plate 13 is welded to the outer wall of the neck tube 2. The flange seat 15 is welded to the top of the second stiffening plate 13. The first stiffening plate 11 and the second stiffening plate 13 are rotatably connected by the first pin 12 to achieve a rotatable connection between the flange cover 17 and the flange seat 15. The flange cover 17 is fixed by the fastening assembly 18 to close the neck tube 2.

[0055] like Figure 5 As shown, in this embodiment, the outer wall of the flange cover 17 has at least one circumferentially spaced notch 171. For example, the flange cover 17 is rectangular, and a notch 171 is provided at each of its four corners. A seat 14, corresponding to the notch 171, is fixedly connected to the outer wall of the neck tube 2 at the feed inlet. The fastening assembly 18 includes a screw 181 rotatably connected to the seat 14 via a second pin 19, and a nut 182 threadedly connected to the screw 181. The lower part of the screw 181 is rotatably connected to the seat 14, and the nut 182 is threadedly connected to the upper part of the screw 181. The screw 181 can be inserted into or disengaged from the notch 171, and the lower end of the nut 182 can abut against the upper end of the flange cover 17 to press the flange cover 17.

[0056] When the inlet of container assembly 3 needs to be opened, loosen nut 182, then rotate screw 181 outward around second pin 19 to disengage screw 181 from notch 171, thereby releasing fastening assembly 18 from fixing flange cover 17. Then rotate flange cover 17 around first pin 12 to open it. When the inlet of container assembly 3 needs to be closed, rotate flange cover 17 in the opposite direction around first pin 12 to cover flange seat 15. Then rotate screw 181 inward around second pin 19 to insert screw 181 into notch 171. Tighten nut 182, with the lower end of nut 182 abutting against the upper end of flange cover 17, thereby fixing flange cover 17 by fastening assembly 18.

[0057] like Figure 2 , Figure 3 and Figure 9 As shown, in this invention, the feeding switch assembly 6 includes a valve body 62 mounted on the side wall of the container assembly 3, a transmission rod 63 connected to the valve body 62 and extending into the container assembly 3, a hemisphere 65 rotatably mounted in the discharge pipe 36 and capable of closing the discharge pipe 36 and fixedly connected to the transmission rod 63, and a handle 61 located outside the container assembly 3 and fixedly connected to the transmission rod 63. The hemisphere 65 is solid or hollow, and its diameter is adapted to the inner diameter of the discharge pipe 36. The transmission rod 63 passes through the center of the hemisphere 65 from front to back and the two are welded together. The hemisphere 65 is rotatably connected to the discharge pipe 36 through the transmission rod 63. By rotating the handle 61, the position of the spherical surface of the hemisphere 65 changes, allowing the hemisphere 65 to simultaneously close the outlets of two storage chambers 38 or open the outlet of one of the storage chambers 38 at different times.

[0058] like Figure 9 As shown, preferably, a bearing 64 is installed at each end of the upper hemisphere 65 of the transmission rod 63. The outer ring of the bearing 64 is welded to the side wall of the feed tube 36, and the inner ring of the bearing 64 is welded to the transmission rod 63.

[0059] like Figure 9 As shown, more preferably, the orientation of the handle 61 is adapted to the orientation of the hemisphere 65. For example, when the handle 61 is vertically upward, the spherical surface of the hemisphere 65 faces upward and contacts the lower end of the partition 33. The hemisphere 65 seals the outlets of the two storage chambers 38 and the discharge pipe 36. Figure 7As shown, the lower end of the preferred partition 33 is an arc shape that matches the spherical surface of the hemisphere 65. When the handle 61 is rotated to the left, the spherical surface of the hemisphere 65 is located on the left side of the feed pipe 36. The hemisphere 65 closes the outlet of the left storage chamber 38 and opens the outlet of the right storage chamber 38, allowing material to be discharged into the right storage chamber 38. Similarly, when the handle 61 is rotated to the right, the spherical surface of the hemisphere 65 is located on the right side of the feed pipe 36. The hemisphere 65 closes the outlet of the right storage chamber 38 and opens the outlet of the left storage chamber 38, allowing material to be discharged into the left storage chamber 38.

[0060] It should be noted that, in practice, to maintain the orientation of the hemisphere 65, it can be achieved by locking the transmission rod 63. For example, the outer wall of the transmission rod 63 is provided with an elastic protrusion, and the valve body 62 is provided with three slots corresponding to the three positions of the handle 61: horizontal left, vertical up, and horizontal right. The elastic protrusion of the transmission rod 63 can be locked into the slots. Alternatively, the transmission rod 63 is threadedly connected to the valve body 62, and self-locking is achieved through the thread. If the thread pitch is small, such as 0.5-1mm, then turning the handle 61 half a turn will move the hemisphere 65 back and forth by 0.25-0.5mm, which will not affect the opening and closing of the outlet of the storage chamber 38.

[0061] like Figure 10 As shown, in this invention, the measuring device 7 is a sight glass installed on the side wall of the cylinder 32 of the container assembly 3. The sight glass 7 has a viewing window 71 and a measuring scale 72. The viewing window 71 is made of transparent material, and the interior of the two storage chambers 38 can be observed through the viewing window 71. Specifically, a sight glass 7 can be installed on the front of the cylinder 32, and the front end of the partition 33 is located in the middle of the viewing window 71 of the sight glass 7. The interior of the left storage chamber 38 can be observed through the left half of the viewing window 71, and the interior of the right storage chamber 38 can be observed through the right half of the viewing window 71. Of course, a sight glass 7 can also be installed for each of the two storage chambers 38, for a total of two sight glasses 7.

[0062] like Figure 3 , Figure 11 and Figure 12 As shown, in this invention, the discharge pipe system 8 includes a discharge pipe 84 connected to the discharge port and extending out of the bottom of the discharge chamber 39. The discharge pipe 84 is a rigid pipe, and a discharge valve 85, which is a ball valve, is connected to the outlet end of the discharge pipe 84. The discharge valve 85 is located near the discharge port of the container assembly 3. A vacuum hose 83 is connected to the outlet end of the discharge valve 85, and the outlet end of the vacuum hose 83 is connected to a pull valve 81, which is a vacuum pull valve. The vacuum hose 83 is fixedly connected to the vacuum pull valve 81 by a vacuum clamp 82. Preferably, a hanger 9 is fixedly connected to the outer wall of the container assembly 3 cylinder 32. When the filling device is not used, the pull valve 81 is hung on the hanger 9 and supported by it.

[0063] like Figure 12 As shown, in this invention, the pull valve 81 includes a valve seat 816 connected to the outlet end of the discharge pipe system 8, that is, the valve seat 816 is connected to the outlet of the vacuum hose 83 through the vacuum clamp 82. The valve seat 816 has a detachable sealing connection at one end (e.g., the right end) to a tube seat 815 that can be connected to the molecular sieve filling port. For example, the right end of the valve seat 816 is rotatably connected to a slip nut 813, and the outer wall of the tube seat 815 is threadedly connected to the slip nut 813. The tube seat 815 has a detachable sealing connection to a valve plate 814 for closing the left end port of the tube seat 815. For example, the inner wall of the left end of the tube seat 815 has a step that restricts the right end of the valve plate 814. The valve plate 814 is inserted into the tube seat 815 and transitionally fitted thereto. A sealing ring 817 is provided between the right end of the valve plate 814 and the step of the tube seat 815. The valve seat 816 has a sliding connection to a pull rod 812 that is detachably connected to the valve plate 814. For example, the right end of the pull rod 812 is threadedly connected to the valve plate 814, and the left end of the pull rod 812 away from the valve plate 814 is fixedly connected to the valve handle 811.

[0064] In this invention, the pipe seat 815 is detachably connected to the valve seat 816 via a slip nut 813. The valve plate 814 is fitted with the pipe seat 815 and is threadedly connected to the pull rod 812. By holding the valve seat 816 and fixing the slip nut 813, the pipe seat 815 can be disengaged from the valve seat 816 by loosening the valve seat 816, thus removing the pipe seat 815 from the pull valve 81. After removing the pipe seat 815, by holding the valve seat 816 and fixing the valve handle 811, the valve plate 814 can be disengaged from the pull rod 812 by rotating the valve plate 814, thus removing the valve plate 814 from the pull valve 81.

[0065] Preferably, the valve plate 814 and the pipe seat 815 are circumferentially fixed. For example, the inner wall of the pipe seat 815 is provided with a sliding groove, and the outer wall of the valve plate 814 is provided with a sliding post that cooperates with the sliding groove. The sliding post of the valve plate 814 is inserted into the sliding groove of the pipe seat 815 to restrict the circumferential rotation of both. Thus, when the pull rod 812 is threaded onto the valve plate 814, the valve plate 814 will not rotate circumferentially.

[0066] Combination Figure 1 As shown below, the specific operation process of filling molecular sieve into the molecular sieve device 06 in the storage tank jacket 03 using the molecular sieve filling device of the present invention will be described in detail below.

[0067] First, let's describe the state of the cryogenic storage tank before molecular sieve filling. Before filling the storage tank interlayer 03 with expanded perlite 04, remove the pipe seat 815 of the pull-down valve 81 and weld the pipe seat 815 to the molecular sieve filling port of the outer shell assembly 02. After filling the storage tank interlayer 03 with expanded perlite 04, remove the valve plate 814 of the pull-down valve 81, install the valve plate 814 into the pipe seat 815, seal the pipe seat 815, and evacuate the storage tank interlayer 03 to a vacuum level of 10 Pa to meet the molecular sieve filling requirements. It should be noted that when evacuating the storage tank interlayer 03, the atmospheric pressure outside the valve plate 814 is greater than the atmospheric pressure inside the valve plate 814, and the valve plate 814 will not detach from the pipe seat 815.

[0068] According to the filling technical requirements, molecular sieves 5A and 13X are unsealed from their packaging bags. The handle 61 of the feeding switch assembly 6 is positioned vertically upwards, and the outlets of the two storage chambers 38 are sealed by the hemisphere 65. The flange cover 17 of the upper cover assembly 1 is opened, and the two molecular sieves are quickly poured into the two storage chambers 38 of the container assembly 3 by rotating the feeding funnel 21. Molecular sieve 5A is stored in the left storage chamber 38, and molecular sieve 13A is stored in the right storage chamber 38. The flange cover 17 and the discharge valve 85 are closed, and the air inlet valve 41 and the air outlet valve 43 of the purge pipe system 4 are opened. Nitrogen gas is introduced through the purge pipe 42 via the air inlet valve 41 to purge the container assembly 3 and replace the air inside.

[0069] After replacing the air with nitrogen, close the outlet valve 43 of the purge pipeline 4, hold the valve seat 816 of the pull valve 81 by hand, rotate the valve handle 811, thread the pull rod 812 to the valve plate 814, push the valve seat 816 forward, rotate the slip nut 813, thread the slip nut 813 to the pipe seat 815, and install the pull valve 81 to the molecular sieve filling port of the cryogenic storage tank to realize the connection between the filling device and the molecular sieve filling port of the cryogenic storage tank.

[0070] Next, turn the handle 61 of the feeding switch assembly 6 to the horizontal right position to open the outlet of the left storage chamber 38 of the container assembly 3. Due to the fluidity of the molecular sieve and gravity, the molecular sieve 5A in the left storage chamber 38 begins to fall into the discharge chamber 39. During this process, the height of the molecular sieve 5A inside the left storage chamber 38 can be observed through the viewing window 71. By referring to the measuring scale 72, the volume of molecular sieve 5A entering the storage chamber 38 can be determined. Turn the handle 61 to the horizontal left position, and the molecular sieve 13A in the right storage chamber 38 of the container assembly 3 falls into the discharge chamber 39. During this process, the height of the molecular sieve 13A inside the right storage chamber 38 can be observed through the viewing window 71. By referring to the measuring scale 72, the volume of molecular sieve 13A entering the storage chamber 38 can be determined. After the molecular sieves 5A and 13A have been fed into the discharge chamber 39, turn the handle 61 to the center-up position, and the hemisphere 65 closes the outlets of both storage chambers 38.

[0071] Next, open the discharge valve 85, pull the valve handle 811 of the pull valve 81 outward to move the valve plate 814 outward, thereby opening the pull valve 81. Using nitrogen gas, the molecular sieve is introduced into the molecular sieve device 06 of the storage tank jacket 03 through the internal and external pressure difference. Once the internal and external pressure difference is balanced, indicating that the molecular sieve filling is complete, the storage tank jacket 03 is at a slightly positive pressure compared to atmospheric pressure. Close the discharge valve 85 and the air inlet valve 41, and disconnect the pull valve 81 from the pipe seat 815. Seal the pipe seat 815 at the molecular sieve filling port. Finally, vacuum pump unit 09 is used to evacuate the storage tank jacket 03 until it passes the required vacuum test.

[0072] The molecular sieve filling device of the present invention mainly uses the pressure difference between the inside and outside of the storage tank jacket 03 and nitrogen gas to carry the molecular sieve into the storage tank molecular sieve device 06. At the beginning of filling, the storage tank jacket 03 is devastated by the nitrogen gas of the molecular sieve filling device of the present invention. Finally, the remaining unfilled molecular sieve is stored in the container assembly 3 of the present invention and sealed with nitrogen gas.

[0073] In the description of this specification, references to terms such as "preferred embodiment," "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0074] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A molecular sieve filling device for a cryogenic storage tank, characterized in that, It includes a container assembly capable of accommodating two molecular sieves, an openable and closable top cover assembly installed at the inlet of the container assembly, a metering device for measuring the amount of the two molecular sieves fed into the container assembly, a discharge pipe system connected to the outlet of the container assembly, and a purging pipe system connected to an inert gas supply device for supplying inert gas into the container assembly. The container assembly has two independent storage chambers connected to the inlet and an outlet chamber located below the two storage chambers and connected to the outlet. The outlets of the two storage chambers are connected to a feeding pipe that extends into the storage chamber. The feeding pipe is connected to a feeding switch assembly. By operating the feeding switch assembly, the outlets of the two storage chambers can be closed simultaneously or opened at different times. The outlet end of the discharge pipe system is equipped with a pull valve that can be connected to the molecular sieve filling port of the cryogenic storage tank. By operating the valve handle of the pull valve, the molecular sieve filling port can be closed or opened. The container assembly is also provided with an air inlet communicating with the storage chamber and an air outlet communicating with the discharge chamber. The purging pipe system includes an air inlet valve at the air inlet, an air outlet valve at the air outlet, and a purging pipe with several air outlet holes located in the container assembly. The inlet of the purging pipe is connected to the air inlet valve, and the air inlet valve is connected to an inert gas supply device. The inert gas transported by the purging pipe can enter the discharge chamber through the storage chamber.

2. The molecular sieve filling device for a cryogenic storage tank according to claim 1, characterized in that, A feed funnel is rotatably connected to the feed inlet. By rotating the feed funnel, the outlet of the feed funnel can be connected to the inlet of the two storage chambers at different times.

3. The molecular sieve filling device for a cryogenic storage tank according to claim 1, characterized in that, The top cover assembly includes a flange seat with a through hole in the middle, which is arranged around the feed inlet; a flange cover for closing the through hole of the flange seat, which is rotatably connected to the flange seat by a first pin; and a fastening assembly for fastening the flange cover.

4. The molecular sieve filling device for a cryogenic storage tank according to claim 3, characterized in that, The outer wall of the flange cover has at least one circumferentially spaced notch. The feed port is fixedly connected to a seat body located below the notch, which corresponds to the notch one by one. The fastening assembly includes a screw rod rotatably connected to the seat body via a second pin and a nut threadedly connected to the screw rod. The screw rod can be inserted into or disengaged from the notch. The lower end of the nut can abut against the upper end of the flange cover to press the flange cover.

5. The molecular sieve filling device for a cryogenic storage tank according to claim 1, characterized in that, The purging pipe is located in the storage chamber and is coiled multiple times along the height direction on the inner wall of the storage chamber. The bottom of the storage chamber is provided with a vent hole.

6. The molecular sieve filling device for a cryogenic storage tank according to claim 1, characterized in that, The feeding switch assembly includes a valve body mounted on the side wall of the container assembly, a transmission rod connected to the valve body and extending into the container assembly, a hemisphere fixed to the transmission rod and rotatably mounted in the feed tube capable of closing the feed tube, and a handle fixed to the transmission rod and located outside the container assembly. By rotating the handle, the hemisphere can simultaneously close the outlets of two storage chambers or open the outlet of one of the storage chambers at different times.

7. The molecular sieve filling device for a cryogenic storage tank according to claim 1, characterized in that, The metering device includes a sight glass disposed on the side wall of the container assembly. The sight glass has a viewing window and a metering scale, through which the interior of the two storage chambers can be observed.

8. The molecular sieve filling device for a cryogenic storage tank according to claim 1, characterized in that, The discharge pipe system includes a discharge pipe connected to the discharge port and extending out of the bottom of the discharge chamber. The outlet end of the discharge pipe is connected to a discharge valve, and the outlet end of the discharge valve is connected to a vacuum hose. The pull valve is a vacuum pull valve, and the vacuum hose is fixed to the vacuum pull valve by a vacuum clamp.

9. A molecular sieve filling device for a cryogenic storage tank according to any one of claims 1-8, characterized in that, The container assembly includes a cylindrical body, a conical funnel disposed within the cylindrical body, and a vertically extending partition. The inlet and outlet are located on the cylindrical body. The upper end of the partition extends to the inlet, and the lower end of the partition extends to the outlet of the conical funnel. The outlet at the bottom of the conical funnel is connected to the discharge pipe. The partition divides the conical funnel into the two storage chambers.

10. A molecular sieve filling device for a cryogenic storage tank according to any one of claims 1-8, characterized in that, The pull valve includes a valve seat connected to the outlet end of the discharge pipe system. The end of the valve seat is detachably and sealingly connected to a tube seat that can be connected to the molecular sieve filling port. A valve plate for closing the tube seat port is detachably and sealingly connected in the tube seat. A pull rod slidably connected to the valve plate is detachably connected in the valve seat. The end of the pull rod away from the valve plate is fixedly connected to the valve handle.

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