Low-temperature storage tank molecular sieve filling device

Abstract

The utility model provides a molecular sieve filling device for a low-temperature storage tank. The molecular sieve filling device 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 material storage cavities and a discharging cavity located below the material storage cavities are formed in the container assembly, the two material storage cavities are jointly connected with a discharging pipe, the discharging pipe is connected with a feeding switch assembly, and outlets of the two material storage cavities can be closed at the same time or opened in a time-sharing mode by operating the feeding switch assembly; a pull valve which can be connected with a molecular sieve filling opening of the low-temperature storage tank is arranged at the outlet end of the discharging pipe system; inert gas conveyed by the purging pipe system can enter the discharging cavity through the material storage cavity. The storage tank interlayer is subjected to vacuum breaking through nitrogen, the molecular sieves and the expanded perlite are located in the nitrogen environment in the filling process, contact with air is reduced, the adsorption capacity of the molecular sieves is stable, the later vacuumizing efficiency is improved, and the heat preservation performance is effectively guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of molecular sieve filling, and particularly relates to a molecular sieve filling device for a cryogenic storage tank. Background Technique

[0002] With the continuous development of China's cryogenic industry chain, the cryogenic liquid market is booming day by day. The sales volume of liquid oxygen, liquid argon, liquid nitrogen, liquid carbon dioxide, and LNG natural gas has increased significantly. The production, storage, and transportation of cryogenic liquids are inseparable from adiabatic insulation containers. At present, vacuum adiabatic pressure vessels at home and abroad are roughly divided into two types, one is a mobile cryogenic storage tank, and the other is a fixed cryogenic storage tank. The adiabatic forms are roughly divided into three types, one is vacuum powder type, one is high vacuum multi-layer adiabatic, and the other is vacuum composite adiabatic. The cryogenic storage tank with vacuum powder adiabatic has its interlayer filled with expanded perlite and pumped to a vacuum state, so as to achieve the effect of adiabatic cold preservation. This cryogenic storage tank is simple to manufacture and has a short cycle, and is widely used.

[0003] To ensure the effect of adiabatic cold preservation, after the cryogenic storage tank is filled with expanded perlite and the interlayer of the storage tank is pumped to a vacuum state, a molecular sieve filling process needs to be carried out on the interlayer of the storage tank. As Figure 1 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 perlite (04), the whole storage tank outer shell (02) is sealed. The filling tooling (05) is connected to the connecting pipe of the molecular sieve device (06), and the storage tank interlayer (03) is evacuated by a vacuum pump group (09). After the vacuum degree is pumped to 10 Pa, the molecular sieve (08) filling process is carried out on the storage tank interlayer (03) through the filling tooling (05).

[0004] Among them, the molecular sieve usually consists of two types of molecular sieves 5A and 13X in a ratio of 3:1. Before filling, both types of molecular sieves are sealed in a sealed barrel. After the two types of molecular sieves are unsealed from the sealed barrel and placed into the barrel (07) according to the volume ratio (since the two types of molecular sieves adsorb different types of gases, do not affect each other, and both are connected to the interlayer space in the storage tank interlayer, so there is no need to mix the two types of molecular sieves). Open the valve on the filling tooling (05), and utilize the internal and external pressure difference between the storage tank interlayer (03) and the outside world to fill the molecular sieve (08) into the molecular sieve device (06) in the storage tank interlayer (03) through the filling tooling (05) by air. After the molecular sieve filling is completed, the filling tooling (05) is removed and the filling port is welded and sealed. Finally, the storage tank interlayer (03) is evacuated subsequently.

[0005] When filling molecular sieves into a cryogenic storage tank in the prior art, the vacuum state of the interlayer (03) of the storage tank is broken through the atmosphere. The molecular sieves and expanded perlite are fully in contact with air. Since the molecular sieves and expanded perlite have strong adsorption capacity under standard conditions, a large amount of water vapor and other gases are adsorbed by the expanded perlite in the interlayer (03) of the storage tank. In addition, since the barrel (07) is not sealed with a sealing rubber sleeve, the molecular sieves in the barrel (07) are not effectively sealed, and the adsorption capacity of the molecular sieves is greatly reduced, resulting in a decrease in the efficiency and quality of subsequent vacuum pumping of the interlayer (03) of the storage tank. The vacuum degree of the cryogenic storage tank rises rapidly during use, and the heat preservation performance decreases, affecting the use. Summary of the Utility Model

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

[0007] To achieve the above object, the present utility model adopts the following technical scheme: A molecular sieve filling device for a cryogenic storage tank includes a container assembly capable of accommodating two kinds of molecular sieves, an openable and closable upper cover assembly installed at the feed inlet of the container assembly, a metering device for measuring the feeding amounts of the two kinds of molecular sieves in the container assembly, a discharge pipe system connected to the discharge outlet of the container assembly, and a purge pipe system connected to an inert gas supply device and capable of supplying inert gas into the container assembly; two independent storage chambers communicating with the feed inlet and a discharge chamber communicating with the discharge outlet are provided in the container assembly. The outlets of the two storage chambers are jointly connected with a feed pipe extending into the storage chamber, and the feed pipe is connected with a feed switch assembly. By operating the feed switch assembly, the outlets of the two storage chambers can be closed simultaneously or opened separately; a pull valve capable of connecting with the molecular sieve filling port of the cryogenic storage tank is provided at the outlet end of the discharge pipe system. By operating the valve handle of the pull valve, the molecular sieve filling port can be closed or opened; the container assembly is further provided with an air inlet communicating with the storage chamber and an air outlet communicating with the discharge chamber. The purge pipe system includes an inlet valve provided at the air inlet, an outlet valve provided at the air outlet, and a purge pipe having a plurality of air holes in the container assembly. The inlet of the purge pipe is connected with the inlet valve, the inlet valve is connected with the inert gas supply device, and the inert gas conveyed by the purge pipe can enter the discharge chamber through the storage chamber.

[0008] In the above technical solution, the vacuum of the storage tank interlayer is broken through by nitrogen. The molecular sieves and expanded perlite are in a nitrogen environment during the filling process, reducing the contact between the expanded perlite and air, improving the subsequent vacuum pumping efficiency, and reducing the time input during the manufacturing process. Moreover, the container assembly is purged with nitrogen through the purge pipe system, and the molecular sieves are sealed with nitrogen, avoiding the contact between air and the molecular sieves. The adsorption capacity of the molecular sieves is stable, effectively ensuring the heat preservation performance of the cryogenic storage tank, and avoiding the problems of a large rebound of the vacuum degree and a sharp decrease in the heat preservation performance during use.

[0009] In a preferred embodiment of the present invention, a feeding funnel is rotatably connected to the feeding port, and by rotating the feeding funnel, the outlet of the feeding funnel can be connected to the inlets of the two storage chambers at different times.

[0010] The above technical solution, by providing a feeding funnel, can separate the two molecular sieve fillers without mixing them through one feeding port, which is beneficial to the feeding of the two molecular sieves.

[0011] In a preferred embodiment of the present invention, the upper cover assembly includes a flange seat with a through hole in the middle that is arranged outside the feed port, a flange cover that is rotatably connected to the flange seat through a first pin shaft and is used to close the through hole of the flange seat, and a fastening assembly for fastening the flange cover.

[0012] In the above technical solution, the upper cover assembly is a flip cover structure, and the flange cover is fixed by arranging a fastening assembly so that the upper cover assembly can bear pressure.

[0013] In a preferred embodiment of the present invention, the outer wall of the flange cover has at least one notch arranged at a circumferential interval, and a seat body corresponding to the notch and located below the notch is fixed to the outside of the feed port. The fastening assembly includes a screw rotatably connected to the seat body through a second pin shaft, and a nut threadedly connected to the screw. The screw can be inserted into or out of the notch, and the lower end of the nut can be pressed against the upper end of the flange cover to compress the flange cover.

[0014] The above technical solution, by providing a notch, a seat, a screw and a nut, after loosening the nut, the screw is rotated outward to release the fixation of the flange cover and realize the quick opening of the upper cover assembly.

[0015] In a preferred embodiment of the present invention, the purge pipe is provided in the storage cavity and is wound around the inner wall of the storage cavity in multiple circles along the height direction, and an air hole is provided at the bottom of the storage cavity.

[0016] In the above technical solution, the purge pipe is coiled around the inner wall of the storage cavity for multiple turns, so that nitrogen can quickly reach all parts of the storage cavity, which is conducive to quickly replacing the air in the container assembly.

[0017] In another preferred embodiment of the present invention, the feeding switch assembly includes a valve body installed 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 installed in the discharge pipe and capable of closing the discharge pipe, and a handle located outside the container assembly fixed to the transmission rod; by rotating the handle, the hemisphere can simultaneously close the outlets of the two storage chambers or open the outlet of one of the storage chambers in a time-sharing manner.

[0018] In the above technical solution, the hemispherical body is half of a sphere, which can simultaneously close the outlets of the two storage chambers or open the outlet of one of the storage chambers at different times, ensuring the storage and discharge of materials in the storage chambers. Moreover, the hemispherical body can prevent the outlets of the two storage chambers from being opened simultaneously, having an anti-misoperation function; by setting up a transmission rod to transmit power, the hemispherical body can be rotated by operating the handle outside the container assembly, which is convenient to operate.

[0019] In another preferred embodiment of the present utility model, the metering device includes a sight glass provided on the side wall of the container assembly. The sight glass has a visual window and a metering scale, and the interior of the two storage chambers can be observed through the visual window.

[0020] In the above technical solution, by observing the height of the top of the molecular sieve in the storage chamber through the sight glass and comparing it with the metering scale, the volume of the molecular sieve entering the storage chamber can be known. The structure is simple and the cost is low.

[0021] In another preferred embodiment of the present utility model, 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 with a discharge valve, the outlet end of the discharge valve is connected with a vacuum hose, the pull valve is a vacuum pull valve, and the vacuum hose is fixedly connected with the vacuum pull valve through a vacuum clamp.

[0022] In the above technical solution, the discharge valve is provided to close the discharge pipe and the discharge port. By setting up the vacuum hose and the pull valve, it is convenient to connect the filling device with the molecular sieve filling port of the cryogenic storage tank. The vacuum hose is a flexible hose, which is not restricted by the site and position.

[0023] In another preferred embodiment of the present utility model, the container assembly includes a cylinder body, a conical funnel provided in the cylinder body, and a vertically extending partition plate. The feed port and the discharge port are provided on the cylinder body. The upper end of the partition plate extends to the feed port, the lower end of the partition plate extends to the outlet of the conical funnel, the outlet at the bottom of the conical funnel is connected with a blanking pipe, and the partition plate divides the conical funnel into two storage chambers.

[0024] In the above technical solution, the partition plate divides the conical funnel into two storage chambers. The structure is simple, and the structure of the conical funnel is convenient for the smooth discharge of materials in the storage chambers.

[0025] In another preferred embodiment of the present utility model, 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 with a pipe seat that can be connected to the molecular sieve filling port. A valve plate for closing the port of the pipe seat is detachably and sealingly connected in the pipe seat. A pull rod detachably connected with the valve plate is slidably connected in the valve seat, and the end of the pull rod far away from the valve plate is fixedly connected with a valve handle.

[0026] In the above technical solution, by pulling the pull rod, the valve plate and the pipe seat are opened and closed, playing the role of series packing, and the operation is simple; moreover, the pipe seat and the valve seat are detachably connected, the valve plate and the pipe seat are detachably connected, and the valve plate and the pull rod are detachably connected, so that both the pipe seat and the valve plate can be removed from the pull valve and connected to the molecular sieve filling port of the cryogenic storage tank, without affecting the filling of expanded perlite and vacuum pumping of the cryogenic storage tank.

[0027] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0029] Figure 1 is a schematic structural diagram of filling molecular sieve into a cryogenic storage tank in the prior art.

[0030] Figure 2 is a schematic structural diagram of a molecular sieve filling device for a cryogenic storage tank in an embodiment.

[0031] Figure 3 is a front view sectional schematic diagram of a molecular sieve filling device for a cryogenic storage tank in an embodiment.

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

[0033] Figure 5 is Figure 2 a partial enlarged schematic diagram at A in

[0034] Figure 6 is Figure 4 a three-dimensional structural schematic diagram of a feed hopper in

[0035] Figure 7 is a sectional structural schematic diagram of a container assembly in an embodiment.

[0036] Figure 8 is a schematic structural diagram of a purge inlet pipe system in an embodiment.

[0037] Figure 9 is a schematic structural diagram of a feed switch assembly in an embodiment.

[0038] Figure 10 is a schematic structural diagram of a sight glass in an embodiment.

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

[0040] Figure 12 is Figure 11 a structural schematic diagram of the pull valve in

[0041] The reference numerals in the attached drawings of the specification include: inner container assembly 01, outer shell assembly 02, storage tank interlayer 03, expanded perlite 04, filling tooling 05, molecular sieve device 06, barrel 07, molecular sieve 08, vacuum pumping unit 09, upper cover assembly 1, first rib plate 11, first pin shaft 12, second rib plate 13, seat body 14, flange seat 15, gasket 16, flange cover 17, notch 171, fastening assembly 18, screw 181, nut 182, second pin shaft 19, neck tube 2, feed hopper 21, hanging ear 211, hanging ring 22, wing plate 221, container assembly 3, top head 31, cylinder body 32, partition plate 33, conical funnel 34, vent hole 35, blanking pipe 36, bottom head 37, storage cavity 38, discharge cavity 39, purging pipe system 4, inlet valve 41, purging pipeline 42, air outlet hole 421, air valve 43, support 5, caster 51, feeding switch assembly 6, handle 61, valve body 62, transmission rod member 63, bearing 64, hemispherical body 65, metering device (sight glass) 7, visual window 71, metering scale 72, discharge pipe system 8, pull valve 81, valve handle 811, pull rod 812, loose 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, hanging rack 9. Specific embodiments

[0042] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the attached drawings, in which the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the attached drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0043] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "longitudinal", "transverse", "vertical", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the attached drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0044] In the description of the present utility model, unless otherwise specified and defined, it should be noted that the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the communication inside two components. It can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0045] The present utility model provides a molecular sieve filling device for a cryogenic storage tank. As Figure 2 and Figure 3 shown, in a preferred embodiment, the filling device includes a container assembly 3 capable of accommodating two types of molecular sieves, an upper cover assembly 1 capable of opening and closing installed at the feed port on the top of the container assembly 3, a metering device 7 for measuring the feeding amount of the two types of molecular sieves in the container assembly 3, a discharge pipe system 8 connected to the discharge port of the container assembly 3, and a purge pipe system 4 connected to an inert gas supply device and capable of supplying an inert gas (such as nitrogen) into the container assembly 3.

[0046] Among them, two independent storage chambers 38 communicating with the feed port of the container assembly 3 and a discharge chamber 39 communicating with the discharge port of the container assembly 3 are provided inside the container assembly 3. The outlets of the two storage chambers 38 are jointly connected with a feed pipe 36 extending downward into the storage chamber 38. The feed pipe 36 is connected with 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 of the storage chamber 38 can be opened at different times. The outlet end of the discharge pipe system 8 is provided with a pull valve 81 capable of connecting with 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] As Figure 2 and Figure 3 shown, the container assembly 3 is further provided with an air inlet communicating with the storage chamber 38 and an air outlet communicating with the discharge chamber 39. Combining Figure 8 shown, the purge pipe system 4 includes an inlet valve 41 provided at the air inlet, an outlet valve 43 provided at the air outlet, and a purge pipe 42 having a plurality of air holes 421 located in the container assembly 3. The air holes 421 can be through holes with a diameter of φ2 mm, which is smaller than the diameter of the molecular sieve and can only let out gas. Both the inlet valve 41 and the outlet valve 43 are ball valves. The inlet of the purge pipe 42 is connected with the inlet valve 41, and the inlet valve 41 is connected with an inert gas supply device (not shown in the figure). The inert gas conveyed by the purge pipe 42 can enter the discharge chamber 39 through the storage chamber 38.

[0048] As Figure 3 and Figure 8As shown, preferably, the purging pipe 42 is disposed in the storage chamber 38 and spirally wound around the inner wall of the storage chamber 38 in multiple turns in the height direction. For example, the purging pipe 42 is divided into left and right parallel groups, and the two groups of purging pipes 42 are respectively located in two storage chambers 38. A plurality of air-permeable holes 35 are provided at the bottom of the storage chamber 38, so that the gas in the storage chamber 38 can be discharged into the discharge chamber 39.

[0049] As Figure 3 and Figure 7 As shown, in an embodiment, the container assembly 3 includes a cylinder body 32, a conical funnel 34 disposed in the cylinder body 32, and a vertically extending partition plate 33. The top of the cylinder body 32 is an upwardly protruding arc-shaped top head 31, and the bottom of the cylinder body 32 is a downwardly concave arc-shaped bottom head 37. The feed inlet of the container assembly 3 is provided at the top of the top head 31 of the cylinder body 32, and the discharge outlet of the container assembly 3 is provided on the circular side wall of the cylinder body 32 and close to the bottom head 37. The upper end of the partition plate 33 extends to the feed inlet of the container assembly 3, and the lower end of the partition plate 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 blanking pipe 36. The partition plate 33 divides the conical funnel 34 into left and right two storage chambers 38. The air-permeable holes 35 are provided at the bottom of the conical funnel 34. For example, a plurality of through holes with a diameter of φ2mm are provided 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, as Figure 2 As shown, the container assembly 3 is installed on a support 5 with casters 51. For example, the outer wall of the cylinder body 32 of the container assembly 3 is welded to the support 5, and the container assembly 3 is supported by the support 5, which is convenient for moving the molecular sieve filling device.

[0051] As 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, a neck pipe 2 extending upward is welded at the feed inlet of the container assembly 3. The feed funnel 21 is rotatably installed in the neck pipe 2, and the upper cover assembly 1 is installed on the neck pipe 2. The feed inlet of the container assembly 3 is closed by closing the opening at the upper end of the neck pipe 2.

[0052] As Figure 4 and Figure 6As shown in the figure, the specific connection method between the feed hopper 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 a wing plate 221 extending upward. The top of the feed hopper 21 has a hanging ear 211 extending outward and downward. The hanging ear 211 of the feed hopper 21 is hung on the wing plate 221 of the hanging ring 22 and can slide circumferentially on the wing plate 221. The feed hopper 21 includes an arc-shaped side wall and a downwardly inclined bottom fixedly connected to the lower end of the side wall. The outlet of the feed hopper 21 is located on the opposite side of its side wall.

[0053] As Figure 3 shown in the figure, when a molecular sieve (such as molecular sieve 5A) needs to be added to the left storage cavity 38, the upper cover assembly 1 is opened, and the feed hopper 21 is rotated to the right. The outlet of the feed hopper 21 faces left and extends above the left storage cavity 38. Pour the molecular sieve 5A into the neck tube 2. Under the guiding action of the feed hopper 21, the molecular sieve 5A can only enter the left storage cavity 38; when another molecular sieve (such as molecular sieve 13A) needs to be added to the right storage cavity 38, the feed hopper 21 is rotated circumferentially in the neck tube 2 to the left. The outlet of the feed hopper 21 faces right and extends above the right storage cavity 38. Pour the molecular sieve 13A into the neck tube 2. Under the guiding action of the feed hopper 21, the molecular sieve 13A can only enter the right storage cavity 38, so as to realize the separation and non-mixing of the two molecular sieve fillers.

[0054] As Figure 4 shown in the figure, in the present utility model, the upper cover assembly 1 includes a flange seat 15 with a through hole in the middle and arranged around the neck tube 2 at the feed port, a flange cover 17 rotatably connected to the flange seat 15 through a first pin shaft 12 for closing the through hole of the flange seat 15, 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. Among them, a first rib plate 11 is welded to the left end of the flange cover 17, a second rib 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 rib plate 13, and the first rib plate 11 and the second rib plate 13 are rotatably connected through the first pin shaft 12 to realize the rotational 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] As Figure 5As shown, in this embodiment, the outer wall of the flange cover 17 has at least one notch 171 arranged at circumferential intervals. For example, the flange cover 17 is rectangular, and one notch 171 is arranged at each of its four corners; a seat body 14 corresponding to the notch 171 one by one and located below the notch 171 is fixedly connected to the outer wall of the neck pipe 2 at the feed inlet. The fastening assembly 18 includes a screw 181 rotatably connected to the seat body 14 through a second pin shaft 19, and a nut 182 threadedly connected to the screw 181. The lower part of the screw 181 is rotatably connected to the seat body 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 tightly.

[0056] When it is necessary to open the feed inlet of the container assembly 3, loosen the nut 182, and then rotate the screw 181 outward around the second pin shaft 19 to make the screw 181 leave the notch 171, so as to release the fixation of the fastening assembly 18 on the flange cover 17. Then rotate the flange cover 17 around the first pin shaft 12 and open it; when it is necessary to close the feed inlet of the container assembly 3, rotate the flange cover 17 reversely around the first pin shaft 12, cover it on the flange seat 15, then rotate the screw 181 inward around the second pin shaft 19 to make the screw 181 insert into the notch 171, tighten the nut 182, and the lower end of the nut 182 abuts against the upper end of the flange cover 17 to fix the flange cover 17 through the fastening assembly 18.

[0057] As Figure 2 , Figure 3 and Figure 9 shown, in the present utility model, the feeding switch assembly 6 includes a valve body 62 installed 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 hemispherical body 65 fixedly connected to the transmission rod 63 and rotatably installed in the blanking pipe 36 and capable of closing the blanking pipe 36, and a handle 61 located outside the container assembly 3 and fixedly connected to the transmission rod 63. The hemispherical body 65 is solid or hollow, and the diameter of the hemispherical body 65 is adapted to the inner diameter of the blanking pipe 36. The transmission rod 63 passes through the center of the sphere of the hemispherical body 65 from front to back and is welded and fixed to each other. The hemispherical body 65 is rotatably connected to the blanking pipe 36 through the transmission rod 63. By rotating the handle 61, the spherical position of the hemispherical body 65 will change, so that the hemispherical body 65 can simultaneously close the outlets of the two storage cavities 38 or open the outlet of one of the storage cavities 38 at different times.

[0058] As Figure 9 shown, preferably, a bearing 64 is installed at each of the two ends of the hemispherical body 65 on the transmission rod 63. The outer ring of the bearing 64 is welded to the side wall of the blanking pipe 36, and the inner ring of the bearing 64 is welded to the transmission rod 63.

[0059] As Figure 9As shown, further preferably, the direction of the handle 61 is adapted to the direction 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 closes the outlets of the two storage chambers 38 and the discharge pipe 36. Figure 7 As shown, the lower end of the partition 33 is preferably arc-shaped to match the spherical surface of the hemisphere 65. When the handle 61 is rotated horizontally to the left, the spherical surface of the hemisphere 65 is located on the left side of the discharge tube 36, and the hemisphere 65 closes the outlet of the left storage chamber 38, while the outlet of the right storage chamber 38 is opened, allowing the right storage chamber 38 to discharge into the storage chamber 38. Similarly, when the handle 61 is rotated horizontally to the right, the spherical surface of the hemisphere 65 is located on the right side of the discharge tube 36, and the hemisphere 65 closes the outlet of the right storage chamber 38, while the outlet of the left storage chamber 38 is opened, allowing the left storage chamber 38 to discharge into the storage chamber 38.

[0060] It should be noted that, in practice, in order to maintain the orientation of the hemisphere 65, this can be achieved by locking the transmission rod 63. For example, an elastic protrusion is provided on the outer wall of the transmission rod 63, and three slots are provided on the valve body 62 corresponding to the three positions of the handle 61 facing horizontally to the left, vertically upward and horizontally to the right. The elastic protrusions of the transmission rod 63 can be snapped into the slots; for example, the transmission rod 63 is threadedly connected to the valve body 62, and self-locking is achieved through the thread. The pitch of the thread is small, for example, the pitch is 0.5-1mm. When the handle 61 is rotated half a circle, the hemisphere 65 moves back and forth by 0.25-0.5mm, which does not affect the opening and closing of the outlet of the storage chamber 38.

[0061] like Figure 10 As shown, in the present invention, the metering device 7 is a sight glass provided on the side wall of the cylinder 32 of the container assembly 3. The sight glass 7 has a viewing window 71 and a metering scale 72. The viewing window 71 is made of a transparent material, and the interiors of the two storage chambers 38 can be observed through the viewing window 71. Specifically, a sight glass 7 can be provided 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, one sight glass 7 can also be provided for each of the two storage chambers 38, for a total of two sight glasses 7.

[0062] like Figure 3 、 Figure 11 and Figure 12As shown, in the present utility model, 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. The outlet end of the discharge pipe 84 is connected with a discharge valve 85. The discharge valve 85 is a ball valve and is arranged close to the discharge port of the container assembly 3. The outlet end of the discharge valve 85 is connected with a vacuum hose 83. The outlet end of the vacuum hose 83 is connected with a pull valve 81. The pull valve 81 is a vacuum pull valve. The vacuum hose 83 is fixedly connected with the vacuum pull valve 81 through a vacuum clamp 82. Preferably, a hanging bracket 9 is fixedly connected to the outer wall of the cylinder body 32 of the container assembly 3. When the filling device is not in use, the pull valve 81 is hung on the hanging bracket 9 and supported by it.

[0063] As Figure 12 shown, in the present utility model, 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 a vacuum clamp 82. A pipe seat 815 capable of being connected to the molecular sieve filling port is detachably and sealingly connected to the end (such as the right end) of the valve seat 816. For example, a loose nut 813 is rotatably connected to the right end of the valve seat 816, and the outer wall of the pipe seat 815 is threadedly connected to the loose nut 813. A valve plate 814 for closing the left end port of the pipe seat 815 is detachably and sealingly connected in the pipe seat 815. For example, there is a step on the inner wall of the left end of the pipe seat 815 to limit the right end of the valve plate 814. The valve plate 814 is inserted into the pipe seat 815 to have an interference fit with it. A sealing ring 817 is arranged between the right end of the valve plate 814 and the step of the pipe seat 815. A pull rod 812 detachably connected to the valve plate 814 is slidably connected in the valve seat 816. 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 the present utility model, the pipe seat 815 is detachably connected to the valve seat 816 through a loose nut 813. The valve plate 814 has an interference fit with the pipe seat 815, and the valve plate 814 is threadedly connected to the pull rod 812. Hold the valve seat 816 and fix the loose nut 813. By loosening the valve seat 816, the pipe seat 815 can be detached from the valve seat 816 to remove the pipe seat 815 from the pull valve 81. After removing the pipe seat 815, hold the valve seat 816 and fix the valve handle 811. By rotating the valve plate 814, the valve plate 814 can be detached from the pull rod 812 to remove the valve plate 814 from the pull valve 81.

[0065] Preferably, the valve plate 814 is circumferentially fixedly connected to the pipe seat 815. For example, a chute is arranged on the inner wall of the pipe seat 815, and a sliding column cooperating with the chute is arranged on the outer wall of the valve plate 814. The sliding column of the valve plate 814 is inserted into the chute of the pipe seat 815 to limit their circumferential rotation. Thus, when the pull rod 812 is threadedly connected to the valve plate 814, the valve plate 814 will not rotate circumferentially.

[0066] Combined with Figure 1As shown, the specific operation process of filling the molecular sieve device 06 in the tank interlayer 03 with the molecular sieve filling device of the present invention will be described in detail below.

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

[0068] In accordance with filling technical requirements, the molecular sieves 5A and 13X are unpacked from their sealed packaging bags, the handle 61 of the feed switch assembly 6 is placed in a vertically upward position, and the outlets of the two storage chambers 38 are sealed by the hemispherical body 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 feed funnel 21. The molecular sieves 5A are stored in the storage chamber 38 on the left, and the molecular sieves 13A are stored in the storage chamber 38 on the right. Close the flange cover 17 and the discharge valve 85, open the air inlet valve 41 and the air outlet valve 43 of the purge pipe system 4, and introduce nitrogen gas from the purge pipe 42 through the air inlet valve 41 to purge the container assembly 3 with nitrogen to displace the air therein.

[0069] After nitrogen replaces the air, close the outlet valve 43 of the purge pipe system 4, hold the valve seat 816 of the pull valve 81, turn the valve handle 811, thread the pull rod 812 to the valve plate 814, push the valve seat 816 forward, rotate the slip-on nut 813, thread the slip-on nut 813 to the pipe seat 815, and install the pull valve 81 to the molecular sieve filling port of the low-temperature storage tank to realize the connection between the filling device and the molecular sieve filling port of the low-temperature storage tank.

[0070] Next, turn the handle 61 of the feeding switch assembly 6 to the horizontally rightward state to open the outlet of the left storage cavity 38 of the container assembly 3. Due to the fluidity and gravity of the molecular sieve, the molecular sieve 5A in the left storage cavity 38 starts to fall into the discharge cavity 39. During this period, the height of the molecular sieve 5A in the left storage cavity 38 can be observed through the viewing window 71. By comparing with the measurement scale 72, the volume of the molecular sieve 5A entering the storage cavity 38 can be known. Then turn the handle 61 to the horizontally leftward state, and the molecular sieve 13A in the right storage cavity 38 of the container assembly 3 falls into the discharge cavity 39. During this period, the height of the molecular sieve 13A in the right storage cavity 38 is observed through the viewing window 71. By comparing with the measurement scale 72, the volume of the molecular sieve 13A entering the storage cavity 38 can be known. After the feeding of the molecular sieve 5A and the molecular sieve 13A to the discharge cavity 39 is completed, turn the handle 61 to the middle upward state, and the outlets of the two storage cavities 38 are closed by the hemispherical body 65.

[0071] After that, open the discharge valve 85, pull the valve handle 811 of the pull valve 81 outward to make the valve plate 814 move outward to open the pull valve 81. By using the pressure difference between the inside and outside, nitrogen is used to bring the molecular sieve into the molecular sieve device 06 in the storage tank interlayer 03. When the pressure difference between the inside and outside is balanced, that is, when the molecular sieve filling is completed, the storage tank interlayer 03 is at a slightly positive pressure compared with the atmospheric pressure at this time. Then close the discharge valve 85 and the intake valve 41, and remove the connection between the pull valve 81 and the pipe seat 815, and seal the pipe seat 815 at the molecular sieve filling port. Finally, evacuate the storage tank interlayer 03 by the vacuum pump group 09 to be qualified.

[0072] The molecular sieve filling device of the present utility model mainly fills the molecular sieve device 06 of the storage tank by using the pressure difference between the inside and outside of the storage tank interlayer 03 of the storage tank and using nitrogen to carry the molecular sieve. At the initial stage of filling, the storage tank interlayer 03 breaks the vacuum state through the nitrogen of the molecular sieve filling device of the present utility model. Finally, the remaining unfilled molecular sieve is stored in the container assembly 3 of the present utility model and sealed with nitrogen.

[0073] In the description of this specification, the description with reference to terms such as "preferred embodiment", "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0074] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. Molecular sieve filling device for cryogenic storage tank, characterized in that, It includes a container assembly capable of accommodating two types of molecular sieves, an upper cover assembly that can be opened and closed and is installed at the feed port of the container assembly, a metering device for measuring the discharge amounts of the two types of molecular sieves in the container assembly, a discharge pipe system connected to the discharge port of the container assembly, and a purge pipe system connected to an inert gas supply device and capable of supplying inert gas into the container assembly; Inside the container assembly, there are two independent storage chambers communicated with the feed port, and a discharge chamber located below the two storage chambers and communicated with the discharge port. The outlets of the two storage chambers are jointly connected with a feed pipe extending into the storage chamber. The feed pipe is connected with a feed switch assembly. By operating the feed switch assembly, the outlets of the two storage chambers can be closed simultaneously or opened at different times; At the outlet end of the discharge pipe system, there is a pull valve capable of being connected to the molecular sieve filling port of a 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 communicated with the storage chamber and an air outlet communicated with the discharge chamber. The purge pipe system includes an inlet valve provided at the air inlet, an outlet valve provided at the air outlet, and a purge pipe having a plurality of air holes in the container assembly. The inlet of the purge pipe is connected to the inlet valve, and the inlet valve is connected to an inert gas supply device. The inert gas conveyed by the purge 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, wherein A feed funnel is rotatably connected in the feed port. By rotating the feed funnel, the outlet of the feed funnel can be connected to the inlets 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 upper cover assembly includes a flange seat with a through hole in the middle and ringed outside the feed port, a flange cover for closing the through hole of the flange seat and rotatably connected to the flange seat through a first pin shaft, and a fastening assembly for fastening the flange cover.

4. The molecular sieve filling device for cryogenic storage tank according to claim 3, wherein On the outer wall of the flange cover, there are at least one notch arranged at circumferential intervals. Outside the feed port, there are seat bodies fixedly connected corresponding to the notches and located below the notches. The fastening assembly includes a screw rod rotatably connected to the seat body through a second pin shaft 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.

5. The molecular sieve filling device for a cryogenic storage tank according to claim 1, wherein The purge pipe is arranged in the storage chamber and spirally wound around the inner wall of the storage chamber in multiple circles in the height direction. The bottom of the storage chamber is provided with air permeable holes.

6. The molecular sieve filling device for a cryogenic storage tank according to claim 1, wherein, The feed switch assembly includes a valve body installed on the side wall of the container assembly, a transmission rod extending into the container assembly and connected to the valve body, a hemisphere fixedly connected to the transmission rod and rotatably installed in the feed pipe and capable of closing the feed pipe, and a handle located outside the container assembly and fixedly connected to the transmission rod; By rotating the handle, the hemisphere can simultaneously close the outlets of the 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 installed on the side wall of the container assembly. The sight glass has a visible window and a metering scale. The interior of the two storage chambers can be observed through the visible window.

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 with a discharge valve, the outlet end of the discharge valve is connected with a vacuum hose, the pull valve is a vacuum pull valve, and the vacuum hose is fixedly connected with the vacuum pull valve through a vacuum clamp.

9. The 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 cylinder body, a conical funnel arranged in the cylinder body, and a vertically extending partition plate. The feed port and the discharge port are arranged on the cylinder body. The upper end of the partition plate extends to the feed port, the lower end of the partition plate extends to the outlet of the conical funnel, the outlet at the bottom of the conical funnel is connected with the blanking pipe, and the partition plate divides the conical funnel into the two storage chambers.

10. The 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 with a pipe seat capable of being connected with the molecular sieve filling port. A valve plate for closing the port of the pipe seat is detachably and sealingly connected in the pipe seat. A pull rod detachably connected with the valve plate is slidably connected in the valve seat, and the end of the pull rod far away from the valve plate is fixedly connected with the valve handle.

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