A filter screen for cryogenic liquid cargo pump

Abstract

The present application discloses a filter screen for a cryogenic liquid cargo pump, which relates to the field of pump inlet filters, and comprises a filtering mechanism arranged in a suction section at the lower end of a liquid cargo pump housing; the filtering mechanism comprises a right arc filter screen and a left arc filter screen respectively fixed on both sides of the lower end of the suction section, a bottom ring plate is fixed to the lower ends of the right arc filter screen and the left arc filter screen, a through hole is arranged in the middle of the bottom ring plate, and an annular wedge block abutting against the lower ends of the inner walls of the right arc filter screen and the left arc filter screen is fixed to the upper end of the bottom ring plate, and a bottom filter screen for filtering liquid at the bottom of the cryogenic liquid cargo pump is fixed to the upper end of the annular wedge block.

Description

Technical Field

[0001] The present application relates to the field of pump inlet filters, and in particular to a filter screen for cryogenic liquid cargo pumps. Background Art

[0002] Marine cryogenic liquid cargo pumps refer to pumps that can withstand low temperature environments and are used to transport cryogenic liquid cargoes on ships. They are mainly used for the transportation of cryogenic media such as liquefied natural gas (LNG) and liquefied petroleum gas (LPG). During ship transportation, these cryogenic liquids need to maintain their low temperature state to ensure safe transportation and storage. The structural structure of marine cryogenic liquid cargo pumps mainly includes pump head, cryogenic motor, outlet flange, cryogenic junction box, pump base, suction filter and other components. Among them, the pump head is the core component of marine cryogenic liquid cargo pumps, which is mainly composed of suction section, inducer, impeller, guide vane, middle section, cylinder, middle section, axial force balance mechanism. Marine cryogenic liquid cargo pumps are mainly used in the field of ship transportation, especially on LNG carriers and LPG carriers. With the adjustment of the global energy structure and the development of clean energy, the transportation demand for liquefied natural gas and liquefied petroleum gas is increasing, and the market demand for marine cryogenic liquid cargo pumps is also expanding. The suction filter is very important in the operation of the pump body. It is used to filter impurities and particles in the cryogenic liquid to prevent them from entering the pump body to cause damage or affect the performance of the pump. The presence of the filter can effectively extend the service life of the cryogenic liquid cargo pump and improve its working efficiency.

[0003] The existing suction filter for the cryogenic liquid cargo pump is an integral arrangement. Since the marine cryogenic liquid cargo pump is installed in a foundation pit at the bottom of the cabin, the distance between the lower end of the marine cryogenic liquid cargo pump and the foundation pit is limited. Therefore, it is inconvenient to disassemble and adjust the marine cryogenic liquid cargo pump during installation or disassembly, resulting in cumbersome maintenance steps. At the same time, when local damage occurs, it will be replaced as a whole, resulting in increased maintenance costs. Summary of the invention

[0004] In order to improve the problem of easy replacement of the filter and reduce the maintenance and use costs, the present application provides a filter for a cryogenic liquid cargo pump.

[0005] The present application provides a filter screen for a cryogenic liquid cargo pump using the following technical solution:

[0006] A filter screen for a cryogenic liquid cargo pump comprises a filter mechanism arranged at a suction section at the lower end of a liquid cargo pump housing;

[0007] The filtering mechanism comprises a right arc filter and a left arc filter respectively fixed on both sides of the lower end of the suction section, the right arc filter and the left arc filter have the same structural dimensions, the right arc filter and the left arc filter are plugged into each other and form a circle, the outer surfaces of the right arc filter and the left arc filter are evenly provided with a plurality of reinforcing plates, and the port of the suction section is located inside the right arc filter and the left arc filter;

[0008] A bottom ring plate is fixed to the lower ends of the right arc filter and the left arc filter, the middle portion of the bottom ring plate is set as a through hole, and an annular wedge block abutting against the lower ends of the inner walls of the right arc filter and the left arc filter is fixed to the upper end of the bottom ring plate, and a bottom filter screen for filtering the liquid at the bottom of the cryogenic liquid cargo pump is fixed at the upper end of the annular wedge block.

[0009] By adopting the above technical solution, the right arc filter and the left arc filter are spliced ​​together to form a complete filter, and in conjunction with the bottom filter, multi-directional liquid filtration of the cryogenic liquid cargo pump can be achieved. At the same time, removing the fastening bolts can enable the filter to be disassembled in a small lateral space, making it easier for maintenance personnel to maintain the filter.

[0010] Preferably, an inclined insert plate 2 is fixedly provided on the upper part of one end of the right arc-shaped filter screen and the left arc-shaped filter screen, and an inclined insert opening is formed between one end of the inclined insert plate 2 and the outer wall of the right arc-shaped filter screen.

[0011] By adopting the above technical solution, the setting of the oblique plug plate 2 can achieve the positioning effect of the right arc filter and the left arc filter when splicing them, effectively avoiding the misalignment of the right arc filter and the left arc filter when abutting, affecting the subsequent installation.

[0012] Preferably, the other ends of the right arc filter and the left arc filter are fixed with an inclined plug plate inserted in the inclined plug port to achieve radial limitation, and the inclined plug plate protrudes from the end surface of the other end of the right arc filter.

[0013] By adopting the above technical solution, the inclined plug plate can achieve a positioning effect once it is inserted into the inclined plug port, thereby increasing the radial support force of the filter and facilitating installation for maintenance personnel, saving time and effort.

[0014] Preferably, when the oblique plug plate 1 is inserted into the oblique plug opening, it forms one of the reinforcing plates together with the oblique plug plate 2. The oblique plug plate 1 is flush with the oblique plug plate 2 and has the same thickness as the reinforcing plate.

[0015] By adopting the above technical solution, the setting of the reinforcement plate can improve the strength of the filtering surface of the right arc filter and the left arc filter, avoid deformation due to force, and affect the normal filtering effect. At the same time, when the surface of the plug plate 1 is flush with the inclined plug plate 2 and the thickness is the same as the reinforcement plate, it is convenient for the ring seat to move, and there will be no interference between the structures.

[0016] Preferably, a number of fastening bolts are evenly divided and fixed between the suction section and the upper ends of the right arc filter and the left arc filter, and between the bottom ring plate and the lower ends of the right arc filter and the left arc filter, and gaskets for increasing the tightness are arranged between the heads of the several fastening bolts and the flanges of the right arc filter and the left arc filter.

[0017] By adopting the above technical solution, the setting of the fastening bolts can fix the right arc filter and the left arc filter to facilitate installation and disassembly. At the same time, the set gasket helps to improve the firmness.

[0018] Preferably, the outer sides of the right arc-shaped filter screen and the left arc-shaped filter screen are provided with filter auxiliary components for tightening or removing fastening bolts.

[0019] By adopting the above technical solution, the filter auxiliary component can clean the right arc filter, the left arc filter and the surface of the reinforcement plate, cut and scrape off impurities, reduce the cleaning time of the filter, and the right arc filter and the left arc filter are spliced ​​into a filter.

[0020] Preferably, the filter auxiliary component includes a ring seat slidably mounted on the right arc-shaped filter, the left arc-shaped filter and the surface of the reinforcement plate, a ring cover is fixedly provided on the upper end of the ring seat, the surface structure of the ring cover is the same as the structure of the lower end surface of the ring seat, the side wall of the ring seat abuts against the right arc-shaped filter, the left arc-shaped filter and the reinforcement plate to achieve impurity scraping, and an avoidance groove for the reinforcement plate to be movably inserted is provided at the corresponding position of the inner wall of the ring seat and the reinforcement plate.

[0021] By adopting the above technical solution, the setting of the ring cover can achieve the effect of sealing and isolation. At the same time, the upper end of the gear one is limited, and the avoidance groove slides on the reinforcement plate to guide and limit the ring seat.

[0022] Preferably, an installation cavity is opened inside the ring seat between each two side walls of the avoidance groove, and the bottom of the inner cavity of the installation cavity and the ring cover are movably penetrated by a sleeve corresponding to and adapted to the fastening bolts, and the sleeve is located between the bottom of the inner cavity of the ring seat and the lower end of the ring cover, and a gear 1 is fixedly mounted on the position of the sleeve, which abuts against and limits the bottom of the inner cavity of the ring seat and the lower end of the ring cover.

[0023] By adopting the above technical solution, gear 1 is restricted to rotate in a specified space and then drives the sleeve to rotate stably, providing driving force for the rotation of the sleeve. The setting of the mounting cavity can install the gear set while reducing the mass of the ring seat.

[0024] Preferably, a gear set adapted to gear one is arranged between every two gears one, and the gear set includes gear two, gear three and an intermediate gear respectively arranged between every two gears one and movably interlaced with the ring seat and the ring cover, each gear two and each gear three are respectively arranged on both sides of a single gear one, so that gear two, gear three and gear one are arranged in an arc, each intermediate gear is arranged at the rear side of the avoidance groove and corresponds to the avoidance groove, each intermediate gear is arranged in a triangle with gear two and gear three, and a movable space for the double-sided toothed synchronous belt to move is reserved between each intermediate gear and the inner wall of the ring seat;

[0025] One side of the double-sided tooth synchronous belt is meshed with each gear one and each intermediate gear for transmission, and the other side of the double-sided tooth synchronous belt is meshed with each gear three and each gear two for transmission. The double-sided tooth synchronous belt forms a wrap angle with each gear two, each gear three, each gear one and each intermediate gear.

[0026] By adopting the above technical solution, one of the intermediate gears is used to drive the double-sided toothed synchronous belt, thereby driving multiple gear sets and gear one to rotate, thereby providing driving force for the sleeve to remove the fastening bolts. The arc-shaped arrangement of gear two, gear three and gear one can increase the contact area with the double-sided toothed synchronous belt.

[0027] Preferably, the middle rotating shaft of one of the intermediate gears movably penetrates the bottom wall of the ring seat and the ring cover, and plug connectors are fixedly provided at both ends of the rotating shaft of the intermediate gear.

[0028] By adopting the above technical solution, the plug connector can be connected to an external tool to provide driving force for the rotation of the intermediate gear.

[0029] In summary, the present application includes at least one of the following beneficial technical effects:

[0030] 1. Splice and install the right arc filter and the left arc filter and wrap the liquid inlet of the suction section, and then cover the liquid inlet of the suction section through the bottom filter to achieve multi-directional filtration. At the same time, the splicing installation design can enable the right arc filter and the left arc filter to be disassembled in the lateral space when the longitudinal space of the foundation pit is insufficient. It has very good practicality for the small longitudinal space of the foundation pit of the cryogenic liquid cargo pump used in LNG ships. At the same time, it is easy to install and disassemble, and the disassembly is more convenient, and there is no need to adjust the position of the cryogenic liquid cargo pump;

[0031] 2. With the help of the filter auxiliary component, the fastening bolts on the surface of the right arc filter and the left arc filter can be disassembled and installed at one time, without the need for manual installation one by one, effectively improving the efficiency of filter installation and disassembly, and the operation steps are simple;

[0032] 3. The ring seat contacts the right arc filter, the left arc filter and the reinforcing plate, and the impurities are cut and scraped off by the sharp part of the ring seat, thereby achieving a one-time cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a cross-sectional schematic diagram of the cryogenic liquid cargo pump and filtering mechanism of the present application;

[0034] Figure 2 This is a schematic diagram of the left arc filter structure of the present application;

[0035] Figure 3 This is a schematic diagram of the connection between the filter auxiliary component and the right arc filter and the left arc filter in Example 3 of the present application;

[0036] Figure 4 An exploded schematic diagram of the filtering mechanism of the present application;

[0037] Figure 5 This is a schematic top view of the internal structure of the ring seat of the present application;

[0038] Figure 6 This is a schematic diagram of the installation of the ring cover and the avoidance groove of this application;

[0039] Figure 7 A schematic diagram of the gear set of this application;

[0040] Figure 8 Schematic diagram of the double-sided toothed synchronous belt of the present application.

[0041] Reference numerals: 100, liquid cargo pump housing; 200, suction section; 201, fastener 1;

[0042] 301, reinforcement plate; 302, annular wedge; 303, oblique insert plate 1; 304, bottom filter screen; 305, right arc filter screen; 306, left arc filter screen; 307, bottom ring plate; 308, oblique insert plate 2; 309, oblique insert;

[0043] 401, ring seat; 402, sleeve; 403, ring cover; 404, gear 1; 405, avoidance groove; 406, installation cavity; 407, double-sided tooth synchronous belt; 408, plug connector;

[0044] 4910, gear 2; 4911, gear 3; 4912, intermediate gear;

[0045] 500, middle section; 600, fastening bolts; 601, gasket. DETAILED DESCRIPTION

[0046] The following is combined with Figure 1-Figure 8 This application is described in further detail.

[0047] The embodiment of the present application discloses a filter screen for a cryogenic liquid cargo pump.

[0048] The structures of this application are all made of low-temperature resistant materials.

[0049] Reference Figure 1 , a filter screen for a cryogenic liquid cargo pump, comprising a filtering mechanism arranged in a suction section 200 at the lower end of a liquid cargo pump housing 100;

[0050] The liquid cargo pump housing 100 includes an intermediate section 500 and a suction section 200 fixed to the lower end of the intermediate section 500 by a fastener 201. The fastener 201 is configured as a screw and a nut. The specific connection method is that one end of the screw is threadedly fixed to the threaded hole on the surface of the intermediate section 500, and the other end of the screw is movably inserted into the mounting hole around the suction section 200 and is threadedly fixed to the screw by the nut. An elastic gasket is provided on the outer sleeve of the screw and the nut squeezes the elastic gasket to achieve fixation of the intermediate section 500 and the suction section 200.

[0051] The middle section 500 and the suction section 200 are fixed by fastener 1 201 so that the cryogenic liquid cargo pump can be assembled. The provision of fastener 1 201 facilitates maintenance.

[0052] Reference Figure 1-Figure 4, a filtering mechanism, comprising a right arc filter 305 and a left arc filter 306 respectively fixed on both sides of the lower end of the suction section 200, a plurality of filter holes for filtering are provided on the surfaces of the right arc filter 305 and the left arc filter 306, and the upper and lower sides of the right arc filter 305 and the left arc filter 306 are both flanged, the structural dimensions of the right arc filter 305 and the left arc filter 306 are the same, the two sides of the right arc filter 305 and the two sides of the left arc filter 306 are mutually plugged and form a circle, the outer surface of the right arc filter 305 and the outer surface of the left arc filter 306 are evenly provided with a plurality of reinforcing plates 301, the reinforcing plates 301 are arranged in a long strip shape and the outermost side is flush with the flange of the right arc filter 305, the port of the suction section 200 is located at the right arc filter 305 and the left arc filter 30 6 and the lower port of the suction section 200 is close to the bottom filter 304 and leaves a distance; a number of fastening bolts 600 are equally divided and fixed around the suction section 200 and the upper ends of the right arc filter 305 and the left arc filter 306, and a number of fastening bolts 600 are equally divided and fixed around the bottom ring plate 307 and the lower ends of the right arc filter 305 and the left arc filter 306. The rod of each fastening bolt 600 can be sleeved with an elastic gasket. Since the fastening bolts 600 cooperate with the elastic gasket to achieve the fastening effect is an existing well-known technology, it will not be described in detail. Gaskets 601 for increasing the fastening degree are arranged between the heads of the several fastening bolts 600 and the flanges of the right arc filter 305 and the left arc filter 306. The gasket 601 can be set as a flat gasket. The same fastening bolt 600 passes through the gasket 601 to achieve a fixing effect.

[0053] When installing the filter, the maintenance personnel first align the mounting hole on one side of the left arc filter 306 with the mounting hole on one side of the suction section 200, and then fix them with gaskets and fastening bolts 600. Then, align the mounting hole on one side of the right arc filter 305 with the mounting hole on one side of the suction section 200, and after the two sides of the right arc filter 305 are abutted against the two sides of the left arc filter 306 to form a complete annular filter, they are then fixed with gaskets and fastening bolts 600.

[0054] The bottom of the inner cavity of the ring seat 401 and the surface of the ring cover 403 are surrounded by a plurality of circular holes for the sleeve 402 to movably penetrate.

[0055] Subsequently, the maintenance personnel install the bottom ring plate 307, and insert the annular wedge 302 between the right arc filter 305 and the left arc filter 306 so that they abut against each other, and make the bottom filter 304 close to the bottom of the suction section 200, and the threaded holes around the bottom ring plate 307 correspond to the mounting holes of the right arc filter 305 and the mounting holes of the left arc filter 306, and then first install the gasket 601 on the fastening bolt 600, and finally insert the fastening bolt 600 into the mounting holes of the right arc filter 305 and the mounting holes of the left arc filter 306 and fasten them to the bottom ring plate 307. The threaded holes around 07 are threadedly fixed to achieve a fixing effect, so that when the cryogenic liquid cargo pump extracts the liquid inside the cabin during operation, the liquid on both sides passes through the filtration of the right arc filter 305 and the left arc filter 306 to enter the inner cavity of the suction section 200 and is pumped away by the pump body inside the cryogenic liquid cargo pump and discharged through the drain pipe. The liquid at the bottom of the cryogenic liquid cargo pump first enters the bottom ring plate 307 and the middle part of the annular wedge block 302 and then passes through the filtration of the bottom filter 304 to be extracted and discharged again, thereby achieving the effect of filtering the liquid inside the cabin;

[0056] The cryogenic liquid cargo pump is installed in the foundation pit at the bottom of the cabin. The lower space is limited but the space on both sides is ample. Therefore, when disassembling the right arc filter 305 and the left arc filter 306, the right arc filter 305 and the left arc filter 306 can be removed from both sides, which effectively utilizes the space on both sides of the foundation pit. The installation and disassembly of the bottom filter can be achieved without disassembling the cryogenic liquid cargo pump.

[0057] The middle part of the bottom ring plate 307 is set as a through hole, and the upper end of the bottom ring plate 307 is fixed with an annular wedge 302 that abuts against the lower ends of the inner walls of the right arc filter 305 and the left arc filter 306. The middle part of the annular wedge 302 is set with a through hole, and the diameter of the through hole of the bottom ring plate 307 is the same as the diameter of the through hole of the annular wedge 302. The upper end of the annular wedge 302 is fixed with a bottom filter 304 for filtering the liquid at the bottom of the cryogenic liquid cargo pump, and a plurality of filter holes are opened on the surface of the bottom filter 304.

[0058] The bottom filter 304 is fixed to the upper end of the annular wedge 302 so that there is always space between the lower end of the cryogenic liquid cargo pump and the bottom of the cabin for liquid to enter the pump body, thereby ensuring that the cryogenic liquid cargo pump can work normally.

[0059] Reference Figure 2 , Figure 3An inclined plug plate 2 308 is fixedly provided on the upper part of one end of the right arc filter 305 and the upper part of one end of the left arc filter 306, and an inclined insertion opening 309 is formed between one end of the inclined plug plate 2 308 and the outer wall of the right arc filter 305, and an inclined plug plate 1 303 is fixedly provided on the other end of the right arc filter 305 and the left arc filter 306, and one end of the inclined plug plate 1 303 is inserted into the inclined insertion opening 309 and realizes radial limitation, and one end of the inclined plug plate 1 303 protrudes from the end surface of the other end of the right arc filter 305, and when the inclined plug plate 1 303 is inserted into the inclined insertion opening 309, it forms one of the reinforcing plates 301 with the inclined plug plate 2 308, and the inclined plug plate 1 303 is flush with the surface of the inclined plug plate 2 308 and has the same thickness as the reinforcing plate 301.

[0060] Insert the oblique insert plate 303 of the right arc filter 305 into the oblique insert port 309 of the left arc filter 306, and insert the oblique insert plate 303 of the left arc filter 306 into the oblique insert port 309 of the right arc filter 305, thereby forming two corresponding reinforcing plates 301 to achieve radial support.

[0061] It should be noted that the distance between the bottom of the foundation pit and the bottom of the pump body is greater than the total thickness of the bottom ring plate 307 and the annular wedge block 302 .

[0062] The implementation principle of a filter screen for a cryogenic liquid cargo pump in the embodiment of the present application is as follows: the maintenance personnel repair and replace the filter screen of the cryogenic liquid cargo pump in the foundation pit inside the cabin. When removing the filter screen, the maintenance personnel remove the fastening bolts 600 on the bottom ring plate 307 and take out the bottom ring plate 307 and the annular wedge block 302, and then remove the fastening bolts 600 connecting the right arc filter screen 305 and the left arc filter screen 306 with the suction section 200, and then separate the right arc filter screen 305 from the left arc filter screen 306, and then take out the right arc filter screen 305 and the left arc filter screen 306 from the foundation pit, and replace and repair the damaged filter screen;

[0063] When installing the right arc filter 305 and the left arc filter 306, they only need to be installed in reverse.

[0064] Example 2

[0065] The difference from Example 1 is that: metal plates with a thickness only half the thickness of the reinforcing plate 301 are fixed on both sides of the right arc filter 305 and the left arc filter 306, and both metal plates are provided with mounting holes, which can be inserted into the mounting holes of the metal plates by bolts and fixed by nuts, thereby further fixing the right arc filter 305 and the left arc filter 306 to improve stability.

[0066] Example 3

[0067] Reference Figure 2-Figure 6, the outer sides of the right arc filter 305 and the left arc filter 306 are sleeved with a filter auxiliary component for tightening or removing the tightening bolts 600; the filter auxiliary component includes a ring seat 401 slidably sleeved on the right arc filter 305, the left arc filter 306 and the surface of the reinforcing plate 301, each surface of the ring seat 401 is set to a smooth surface, the upper end of the ring seat 401 and the lower end of the ring cover 403 are fixed by screws (the screws are not shown in the figure), and the inner and outer diameters of the ring seat 401 are the same as the inner and outer diameters of the ring cover 403, and the avoidance groove 405 of the ring seat 401 coincides with the avoidance groove 405 of the ring cover 403 and is connected, and the surface of the ring cover 403 is smooth. The structure is the same as that of the lower end face of the ring seat 401. The side wall of the ring seat 401 abuts against the right arc filter 305, the left arc filter 306 and the reinforcing plate 301 to scrape off impurities. Both ends of the ring seat 401 are provided with sharp portions to cooperate with the right arc filter 305, the left arc filter 306 and the reinforcing plate 301 to cut or scrape off impurities and then clean the surfaces of the right arc filter 305, the left arc filter 306 and the reinforcing plate 301. A number of avoidance grooves 405 are equally spaced around the inner wall of the ring seat 401. The reinforcing plate 301 corresponds to the avoidance groove 405. The reinforcing plate 301 is arranged inside the avoidance groove 405 and can move.

[0068] When maintaining the filter, the maintenance personnel use a lifting tool or manually operate the ring seat 401 to make the avoidance groove 405 on the ring seat 401 slide longitudinally on the surface of the reinforcing plate 301, and then use the sharp part of the ring seat 401 to scrape off impurities on the surface of the right arc filter 305, the surface of the left arc filter 306 and the surface of the reinforcing plate 301. Because the filter of the cryogenic liquid cargo pump is relatively large, this method can be used to achieve rapid cleaning.

[0069] Reference Figure 5 , Figure 7 , Figure 8The ring seat 401 is provided with an installation cavity 406 inside, and each installation cavity 406 is arranged between the side walls of every two avoidance grooves 405. The bottom of the inner cavity of the installation cavity 406 and the ring cover 403 are both movable together and penetrated by a sleeve 402, which corresponds to the fastening bolt 600 and is adapted to the fastening bolt 600. The sleeve 402 can be inserted into the head of the fastening bolt 600, and the sleeve 402 is located between the bottom of the inner cavity of the ring seat 401 and the lower end of the ring cover 403, and a gear 1 404 is sleeved and fixed. The upper and lower ends of the gear 1 404 are respectively abutted and limited by the bottom of the inner cavity of the ring seat 401 and the lower end of the ring cover 403, thereby limiting the rotation of the sleeve 402, and a gear set is arranged between every two gears 1 404, and the gear set is adapted to the gear 1 404, and the gear set includes a gear 2 4910 respectively arranged between every two gears 1 404, Gear three 4911 and intermediate gear 4912, upper and lower ends of gear two 4910, upper and lower ends of gear three 4911 and upper and lower ends of intermediate gear 4912 are respectively movably interlaced with ring seat 401 and ring cover 403, each gear two 4910 and each gear three 4911 are respectively arranged on both sides of a single gear one 404, so that gear two 4910, gear three 4911 and gear one 404 are arranged in an arc, each intermediate gear 4912 is arranged at the rear side of the avoidance groove 405, each intermediate gear 4912 corresponds to the avoidance groove 405, each intermediate gear 4912 and gear two 4910 and gear three 4911 are arranged in a triangle, and a movable space for the double-sided toothed synchronous belt 407 to move is reserved between each intermediate gear 4912 and the inner wall of the ring seat 401, and the double-sided toothed synchronous belt 407 passes between the intermediate gear 4912 and the avoidance groove 405.

[0070] The lower end of the sleeve 402 is normally continuously inserted into the fastening bolts 600 at the lower ends of the right arc-shaped filter screen 305 and the left arc-shaped filter screen 306 .

[0071] When the maintenance personnel disassemble the fastening bolts 600 at the upper and lower ends of the right arc filter 305 and the upper and lower ends of the left arc filter 306, they first lift up the ring seat 401, loosen the fastening bolts 600 with a tool, and then use the normal position of the ring seat 401 to drive one of the intermediate gears 4912 to rotate with the tool, and the intermediate gear 4912 drives the double-sided toothed synchronous belt 407 to rotate, and use the teeth on the surface of the double-sided toothed synchronous belt 407 to drive several gears 2 4910, several gears 3 4911 and several gears 1 404 to rotate synchronously, and several gears 1 404 drive the sleeve 402 set in the middle to rotate, and the multiple sleeves 402 will drive the loosened fastening bolts 600 to rotate, thereby realizing the disassembly of the fastening bolts 600;

[0072] When disassembling the fastening bolts 600 on the upper ends of the right arc filter 305 and the left arc filter 306, the fastening bolts 600 are loosened first, and then the jacking tool and the ring seat 401 are used to jack up and insert the head of the fastening bolts 600 into the upper end of the sleeve 402. Then, the maintenance personnel repeat the above steps to achieve one-time disassembly; and there are two situations after disassembly;

[0073] In the case of Example 3, due to the overall restriction of the ring seat 401, the right arc filter 305 and the left arc filter 306 cannot be removed from both sides of the pump body, and can only be removed vertically from the lower end of the pump body;

[0074] Taking Example 4 as an example, the right arc filter 305 and the left arc filter 306 can be removed from both sides of the pump body, but the ring seat 401 and the double-sided toothed synchronous belt 407 need to be disassembled and installed. Therefore, the maintenance personnel can decide which method to choose based on the pump body structure and the coordination with the bottom of the cabin.

[0075] Reference Figure 5 One side of the double-sided toothed synchronous belt 407 meshes with the teeth of each gear one 404 and the teeth of each intermediate gear 4912 to realize power transmission, and the other side of the double-sided toothed synchronous belt 407 meshes with the teeth of each gear three 4911 and the teeth of each gear two 4910 to transmit power. The double-sided toothed synchronous belt 407 forms a wrap angle with each gear two 4910, each gear three 4911, each gear one 404 and each intermediate gear 4912 to realize transmission stability. A rotating shaft is fixed in the middle of one of the intermediate gears 4912, and the middle rotating shaft of one of the intermediate gears 4912 movably passes through the bottom wall of the ring seat 401 and the ring cover 403 and extends to the outside. Both ends of the rotating shaft of the intermediate gear 4912 are fixed with plug connectors 408. The shape of the plug connector 408 is the same as the head structure of the fastening bolt 600, including but not limited to, and other structures can also be used to match with external tools.

[0076] The maintenance personnel connect the tool to the plug connector 408, and then start the tool, which drives the plug connector 408 to rotate, and then drives the shaft in the middle of the intermediate gear 4912 to rotate, and further drives the intermediate gear 4912 to rotate. The intermediate gear 4912 can drive the double-sided toothed synchronous belt 407 to rotate, and the double-sided toothed synchronous belt 407 can synchronously drive the gear set and the plurality of gears 1 404 to rotate. Through this arrangement, the fastening bolts 600 on the same side of the filter can be removed at one time, saving time and effort and improving maintenance efficiency.

[0077] Among them, the jacking tools and tools are all existing technologies and can be selected according to actual needs.

[0078] The implementation principle of a filter screen for a cryogenic liquid cargo pump in an embodiment of the present application is as follows: the maintenance personnel connects the sleeve 402 with a plurality of loosened fastening bolts 600, and then rotates the plug connector 408 through a tool to drive one of the intermediate gears 4912 to rotate, which further drives the double-sided toothed synchronous belt 407 to rotate. The double-sided toothed synchronous belt 407 drives each gear two 4910, each gear three 4911 and other intermediate gears 4912 of the plurality of gear sets to rotate, thereby achieving a synchronization effect, so that a plurality of fastening bolts 600 can be removed at one time, saving maintenance time and improving maintenance efficiency.

[0079] Example 4

[0080] It should be noted that the ring seat 401 and the ring cover 403 can also be symmetrically spliced. The two symmetrical avoidance grooves 405 of the ring seat 401 can be used as splicing interfaces, and bolts are radially inserted between the two ring seats 401 to achieve the splicing of the two ring seats 401. At the same time, the ring cover 403 is fixed to the ring seat 401 with screws for easy disassembly. This setting can cooperate with the right arc filter 305 and the left arc filter 306 to achieve disassembly on both sides, and also plays the role of cleaning the filter. This embodiment is not shown in the accompanying drawings.

[0081] The above are only optional embodiments of the present disclosure and are not intended to limit the present disclosure. For those skilled in the art, the present disclosure may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A filter screen for a cryogenic liquid cargo pump, characterized in that: It comprises a filtering mechanism arranged at a suction section (200) at the lower end of a liquid cargo pump housing (100); The filtering mechanism comprises a right arc-shaped filter screen (305) and a left arc-shaped filter screen (306) respectively fixed on both sides of the lower end of the suction section (200); the right arc-shaped filter screen (305) and the left arc-shaped filter screen (306) have the same structural dimensions; the right arc-shaped filter screen (305) and the left arc-shaped filter screen (306) are plugged into each other and form a circular shape; a plurality of reinforcing plates (301) are evenly distributed on the outer surfaces of the right arc-shaped filter screen (305) and the left arc-shaped filter screen (306); and the port of the suction section (200) is located inside the right arc-shaped filter screen (305) and the left arc-shaped filter screen (306); A bottom ring plate (307) is fixed to the lower ends of the right arc-shaped filter screen (305) and the left arc-shaped filter screen (306); a through hole is provided in the middle of the bottom ring plate (307); an annular wedge (302) is fixed to the upper end of the bottom ring plate (307) and is in contact with the lower ends of the inner walls of the right arc-shaped filter screen (305) and the left arc-shaped filter screen (306); a bottom filter screen (304) for filtering the liquid at the bottom of the cryogenic liquid cargo pump is fixed to the upper end of the annular wedge (302); A second inclined insert plate (308) is fixedly provided on the upper part of one end of the right arc-shaped filter screen (305) and the left arc-shaped filter screen (306), and an inclined insert opening (309) is formed between one end of the second inclined insert plate (308) and the outer wall of the right arc-shaped filter screen (305); The other ends of the right arc-shaped filter screen (305) and the left arc-shaped filter screen (306) are fixedly provided with an inclined insert plate (303) inserted into the inclined insert opening (309) to achieve radial positioning, and the inclined insert plate (303) protrudes from the end surface of the other end of the right arc-shaped filter screen (305); When the oblique insertion plate 1 (303) is inserted into the oblique insertion opening (309), it forms one of the reinforcing plates (301) together with the oblique insertion plate 2 (308); the oblique insertion plate 1 (303) and the oblique insertion plate 2 (308) are flush with each other in surface and have the same thickness as the reinforcing plate (301); A plurality of fastening bolts (600) are equally spaced and fixedly arranged between the suction section (200) and the upper ends of the right arc-shaped filter screen (305) and the left arc-shaped filter screen (306), and between the bottom ring plate (307) and the lower ends of the right arc-shaped filter screen (305) and the left arc-shaped filter screen (306), and gaskets (601) for increasing the degree of fastening are arranged between the heads of the plurality of fastening bolts (600) and the flanges of the right arc-shaped filter screen (305) and the left arc-shaped filter screen (306).

2. A filter screen for a cryogenic liquid cargo pump according to claim 1, characterized in that: The outer sides of the right arc-shaped filter screen (305) and the left arc-shaped filter screen (306) are sleeved with filter screen auxiliary components for fastening or removing fastening bolts (600).

3. A filter screen for a cryogenic liquid cargo pump according to claim 2, characterized in that: The filter auxiliary component comprises a ring seat (401) slidably sleeved on the surfaces of the right arc-shaped filter screen (305), the left arc-shaped filter screen (306) and the reinforcing plate (301); a ring cover (403) is fixedly arranged at the upper end of the ring seat (401); the surface structure of the ring cover (403) is the same as the structure of the lower end surface of the ring seat (401); the side wall of the ring seat (401) abuts against the right arc-shaped filter screen (305), the left arc-shaped filter screen (306) and the reinforcing plate (301) to achieve impurity scraping; and an avoidance groove (405) for the reinforcing plate (301) to be movably inserted is provided at the inner wall of the ring seat (401) and the corresponding position of the reinforcing plate (301).

4. A filter screen for a cryogenic liquid cargo pump according to claim 3, characterized in that: An installation cavity (406) is provided inside the ring seat (401) between the side walls of each two avoidance grooves (405); a sleeve (402) corresponding to and matching the fastening bolt (600) is provided through the bottom of the inner cavity of the installation cavity (406) and the ring cover (403) so as to move together; the sleeve (402) is located between the bottom of the inner cavity of the ring seat (401) and the lower end of the ring cover (403); a gear 1 (404) is sleeved and fixedly provided on the sleeve (402) so as to abut against and limit the bottom of the inner cavity of the ring seat (401) and the lower end of the ring cover (403).

5. A filter screen for a cryogenic liquid cargo pump according to claim 4, characterized in that: A gear set adapted to the gear one (404) is disposed between each two of the gear ones (404), the gear set comprising a gear two (4910), a gear three (4911) and an intermediate gear (4912) which are respectively disposed between each two of the gear ones (404) and movably interlaced with the ring seat (401) and the ring cover (403), each of the gear two (4910) and each of the gear three (4911) are respectively disposed on both sides of a single gear one (404). , so that gear 2 (4910), gear 3 (4911) and gear 1 (404) are arranged in an arc shape, each of the intermediate gears (4912) is arranged at the rear side of the avoidance groove (405) and corresponds to the avoidance groove (405), each of the intermediate gears (4912) and gear 2 (4910) and gear 3 (4911) are arranged in a triangle, and a movable space for the double-sided toothed synchronous belt (407) to move is reserved between each of the intermediate gears (4912) and the inner wall of the ring seat (401); One side of the double-sided toothed synchronous belt (407) meshes with each of the gears one (404) and each of the intermediate gears (4912) for transmission, and the other side of the double-sided toothed synchronous belt (407) meshes with each of the gears three (4911) and each of the gears two (4910) for transmission. The double-sided toothed synchronous belt (407) forms a wrap angle with each of the gears two (4910), each of the gears three (4911), each of the gears one (404), and each of the intermediate gears (4912).

6. A filter screen for a cryogenic liquid cargo pump according to claim 5, characterized in that: The middle rotating shaft of one of the intermediate gears (4912) movably penetrates the bottom wall of the ring seat (401) and the ring cover (403), and plug connectors (408) are fixedly provided at both ends of the rotating shaft of the intermediate gear (4912).

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