A marine cryogenic liquid cargo pump

Abstract

The present application discloses a marine cryogenic liquid cargo pump, which relates to the field of cryogenic pumps. It includes a cryogenic liquid cargo pump, and the cryogenic liquid cargo pump includes an intermediate section, a cylinder body, a suction section, a motor housing, and a motor cover that are connected to each other and form the outer shell of the cryogenic liquid cargo pump. A flank is fixedly arranged around the lower end of the motor cover, and a fixed arc seat is fixedly arranged at the lower end of each flank. The fixed arc seat is fixed on the foundation pit at the bottom of the ship's cabin through a pump bracket, and a gap for liquid flow is reserved between the lower end of the suction section and the inside of the foundation pit at the bottom of the ship's cabin; Stopping blocks corresponding to each other are fixedly arranged at both ends of the intermediate section; A clamping assembly, including main steel plates fixedly arranged on both sides of the upper end of the fixed arc seat, L-shaped plates are arranged on both sides of the two main steel plates, and cushion plates for clamping and fixing the stopping blocks are fixedly arranged on the opposite sides of the L-shaped plates. With the above settings, the present application has the ability to automatically lock during the process of clamping and fixing the stopping blocks on both sides of the cryogenic liquid cargo pump, thereby improving the fixing and buffering effects on the stopping blocks, and making the stopping blocks always in contact with the cushion plates.

Description

Technical Field

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

[0002] A marine cryogenic liquid cargo pump refers to a pump that can withstand a low-temperature environment and is used to transport cryogenic liquid cargo on a ship, mainly for the transportation of cryogenic media such as liquefied natural gas (LNG) and liquefied petroleum gas (LPG). During the ship transportation process, these cryogenic liquids need to maintain their low-temperature state to ensure safe transportation and storage. The structural components of a marine cryogenic liquid cargo pump mainly include a pump head, a cryogenic motor, an outlet flange, a cryogenic junction box, a pump base, an intake filter, etc. Among them, the pump head is the core component of the marine cryogenic liquid cargo pump, which is mainly composed of an intake section, an inducer, an impeller, a diffuser, a middle section, a cylinder body, an intermediate section, and an axial force balance mechanism. Marine cryogenic liquid cargo pumps are mainly applied 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 continuously, and the market demand for marine cryogenic liquid cargo pumps is also expanding continuously.

[0003] The existing cryogenic liquid cargo pumps are directly connected and fixed to the steel plate at the bottom of the ship through bolts and a pump bracket. However, when the cryogenic liquid cargo pump is working continuously, it will generate vibrations. Long-term operation will cause the bolts to loosen, affecting the service life and working safety of the cryogenic liquid cargo pump, and further leading to wear between the connecting and fixing parts, with poor firmness and stability. Summary of the Invention

[0004] In order to improve the problem that the cryogenic liquid cargo pump shakes and is not firmly fixed due to vibration during long-term operation, the present application provides a marine cryogenic liquid cargo pump.

[0005] The marine cryogenic liquid cargo pump provided by the present application adopts the following technical solutions:

[0006] A marine cryogenic liquid cargo pump includes a cryogenic liquid cargo pump. The cryogenic liquid cargo pump includes an intermediate section, a cylinder body, an intake section, a motor housing, and a motor cover that are connected to each other and form the outer shell of the cryogenic liquid cargo pump. The lower end of the motor cover is fixedly provided with flanks around it, and a fixed arc seat is fixedly provided at the lower end of each flank. The fixed arc seat is fixed on the foundation pit at the bottom of the ship's cabin through a pump bracket, and a gap for liquid flow is reserved between the lower end of the intake section and the inside of the foundation pit at the bottom of the ship's cabin;

[0007] Corresponding stop blocks are fixedly provided at both ends of the intermediate section;

[0008] A clamping assembly includes main steel plates fixedly provided on both sides of the upper end of the fixed arc seat. L-shaped plates are provided on both sides of the two main steel plates, and pads for clamping and fixing the stop blocks are fixedly provided on the opposite sides of the L-shaped plates.

[0009] By adopting the above technical solution, the L-shaped plate moves as required while making the backing plate abut against the surface of the stop block for fixation, thereby achieving the clamping and fixing effect on the stop block, and realizing the buffering effect on the stop block by utilizing the properties of the backing plate itself, so as to reduce the vibration amplitude of the cryogenic liquid cargo pump during operation. At the same time, the distance between the two backing plates can be adjusted to clamp stop blocks of different sizes.

[0010] Preferably, an adjustment hole is provided on the side of the L-shaped plate away from the backing plate, and a bolt I for fixing the L-shaped plate and the main steel plate is movably penetrated between the inside of the adjustment hole and the main steel plate. The backing plate is made of HDPE high-density polyethylene material.

[0011] By adopting the above technical solution, the setting of the adjustment hole can adjust the distance between the two L-shaped plates, and the distance between the two backing plates can be adjusted according to stop blocks of different sizes, and then locked and fixed by the bolt I to achieve the clamping and fixing effect.

[0012] Preferably, a counterbore is provided in the middle of the backing plate, and the length and width dimensions of the backing plate are the same as those of one end of the L-shaped plate.

[0013] By adopting the above technical solution, the setting of the counterbore can facilitate the installation of the countersunk screw, and the same length and width dimensions of the backing plate and the L-shaped plate can increase the aesthetics of the device and avoid interference between structures and affect the normal use of the device.

[0014] Preferably, a countersunk screw that is threadedly fixed to one end of the L-shaped plate is movably inserted into the counterbore, and the head of the countersunk screw is recessed into the counterbore.

[0015] By adopting the above technical solution, the head of the countersunk screw being located inside the counterbore effectively avoids friction and abnormal noise when the backing plate contacts the surface of the stop block.

[0016] Preferably, reinforcing ribs are fixed between the two sides of the lower end of the flank and the surface of the main steel plate.

[0017] By adopting the above technical solution, the setting of the reinforcing ribs can effectively increase the connection stability between the main steel plate and the flank.

[0018] Preferably, self-tightening components for automatically clamping two opposite backing plates are provided on both inner sides of the main steel plate facing the backing plate.

[0019] By adopting the above technical solution, the setting of the self-tightening components can gradually reduce the distance between the two backing plates to achieve the effect of automatically clamping the stop block and avoiding loosening.

[0020] Preferably, the self-tightening component includes main chutes opened at both ends on one side of the main steel plate. Middle chutes are opened on both the upper and lower sides at opposite ends of the main chutes. A side chute is opened at the middle position of the opening of the main chutes.

[0021] By adopting the above technical solution, the arrangement of the main chutes and the middle chutes can guide and limit the stress plate, and the side chute can guide and limit the side slider.

[0022] Preferably, an oil cylinder housing is fixedly provided at one end of the main chute close to the middle chute and the side chute. A second piston column and a first piston column are respectively and slidably arranged at both ends inside the oil cylinder housing. Sealing rings for sealing are sleeved at the ends of the second piston column and the first piston column inside the oil cylinder housing. A gap plate is movably arranged on one side of the inner wall of the main chute where the first piston column is located;

[0023] Under normal conditions, the front surface of the gap plate is in contact with the surface of the first piston column and the surface of the compensation strip respectively. One end of the compensation strip is fixedly provided with a stress plate that slides inside the middle chute;

[0024] One side of the stress plate away from the main steel plate is fixedly connected to one side of the backing plate. The outer surface of the stress plate is flush with the outer surface of the backing plate and they jointly abut against the surface of the stop block.

[0025] By adopting the above technical solution, the setting of the sealing ring can avoid oil leakage at the connection between the second piston column, the first piston column and the oil cylinder housing to achieve a sealing effect. At the same time, by moving the first piston column to push the hydraulic oil, the second piston column can be moved. The setting of the compensation strip can compensate for the distance between the stress plate and the gap plate, thereby increasing the stress area and making the stress plate push the gap plate more stable.

[0026] Preferably, a connecting plate is fixedly provided at the end of the second piston column away from the L-shaped plate. One end of the connecting plate is rotatably provided with a rocker. The rocker movably penetrates through a first shaft fixedly connected to the main steel plate at one-third of the connecting plate. The end of the rocker away from the connecting plate is rotatably provided with a side slider through a second shaft. Both ends of the side slider slide inside the side chute. The side slider is located inside the opening of the main chute. The side slider is fixed to the L-shaped plate;

[0027] Three mounting holes are opened on the side of the gap plate away from the backing plate. Springs fixedly connected inside the main chute are fixedly provided at the bottoms of the inner cavities of the mounting holes.

[0028] By adopting the above technical solution, the side slider moves linearly in the side chute under the drive of the rocker. The distance moved between the two backing plates is in millimeters. Therefore, it is not necessary for the side slider to have an overly long linear movement length. A movement length of 0 - 5 mm is sufficient. Meanwhile, the diameter of the installation hole is set to be larger than the diameter of the spring, so that the clearance plate can fill the distance between the force-bearing plate and the piston rod I in real time through the spring. Thus, each vibration of the stop block can drive the piston rod I to move.

[0029] Preferably, two movable seats are fixedly arranged on one side of the connecting plate where the oil cylinder housing is located. A shaft III is fixed between the two movable seats. A pawl is rotatably arranged in the middle of the shaft III. A torsion spring fixedly connected to the pawl and the movable seat respectively is sleeved outside the shaft III.

[0030] A ratchet rack that is engaged with the pawl is fixedly arranged on the side of the connecting plate facing the pawl. Under the action of the torsion spring, the pawl and the ratchet rack are always in contact to achieve engagement and limit.

[0031] By adopting the above technical solution, the movable seat and the shaft III play a role in supporting and fixing the pawl. Meanwhile, under the action of the torsion spring, the pawl is always in contact with the ratchet rack and can be stuck for limit fixing. Thus, the connecting plate can only move in one direction.

[0032] In summary, the present application includes at least one of the following beneficial technical effects:

[0033] 1. The L-shaped plate can move on the main steel plate through the set adjustment holes to adjust the distance between the two backing plates. Thus, different stop blocks can be installed between the two backing plates. Meanwhile, the provided backing plates can play a role in buffering and shock absorption for the stop blocks, thereby reducing the vibration of the cryogenic liquid cargo pump during operation and increasing the service life of the cryogenic liquid cargo pump.

[0034] 2. With the assistance of the self-tightening component cooperating with structures such as the main steel plate, backing plates, and L-shaped plate, the two backing plates can gradually reduce the distance when the stop block vibrates, thereby clamping the stop block in real time. Even if the surface of the backing plate wears, the worn thickness can be compensated by the movement of the L-shaped plate. Thus, the automatic locking ability of the device is realized, effectively increasing the stability of the device during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a front view schematic diagram of the installation of the cryogenic liquid cargo pump of the present application and the foundation pit at the bottom of the cabin before installation;

[0036] Figure 2 is a cross-sectional view schematic diagram of the cryogenic liquid cargo pump of the present application;

[0037] Figure 3 is a top view schematic diagram of the cryogenic liquid cargo pump of the present application;

[0038] Figure 4Schematic diagram of the clamping assembly of the present application;

[0039] Figure 5 Top view sectional schematic diagram of the clamping assembly of the present application;

[0040] Figure 6 Axonometric schematic diagram of the self - tightening assembly in the second embodiment of the present application;

[0041] Figure 7 Sectional top view schematic diagram of the self - tightening assembly in the second embodiment of the present application;

[0042] Figure 8 Exploded axonometric schematic diagram of the self - tightening assembly in the second embodiment of the present application;

[0043] Figure 9 Schematic diagram of the connection between the pawl and the ratchet rack in the second embodiment of the present application;

[0044] Figure 10 Schematic diagram of the connection between the torsion spring and the pawl in the second embodiment of the present application.

[0045] Reference numerals: 1, intermediate section; 2, cylinder body; 3, suction section; 4, stop block; 5, motor housing; 6, motor cover; 7, flank; 8, fixed arc seat;

[0046] 9, clamping assembly; 901, main steel plate; 902, reinforcing rib; 903, L - shaped plate; 904, bolt one; 905, backing plate; 906, countersunk screw; 907, adjustment hole; 908, countersunk hole;

[0047] 9100, self - tightening assembly; 9101, main chute; 9102, force - receiving plate; 9103, side slider; 9104, rocker; 9105, connecting plate; 9106, oil cylinder housing; 9107, gap plate;

[0048] 9108, side chute; 9109, middle chute; 9110, shaft one; 9111, compensation bar; 9112, mounting hole; 9113, spring; 9114, piston column one; 9115, sealing ring;

[0049] 9116, piston column two; 9117, shaft two; 9118, movable seat; 9119, pawl; 9120, ratchet rack; 9121, torsion spring; 9122, shaft three;

[0050] 10, pump bracket; 11, foundation pit at the bottom of the ship's cabin; 12, liquid outlet pipe. Detailed implementation manners

[0051] The following further elaborates on the present application in conjunction with the attached Figures 1 - 10 for a more detailed description of the present application.

[0052] The embodiment of the present application discloses a marine cryogenic liquid cargo pump.

[0053] Example 1

[0054] Reference Figures 1 - 3 , a marine cryogenic liquid cargo pump. The cryogenic liquid cargo pump is set as the main liquid cargo pump, mainly in the structure of a vertical submerged pump and is mainly used for discharging LNG cargo on the ship. The cryogenic liquid cargo pump includes an intermediate section 1, a cylinder body 2, a suction section 3, a motor housing 5, and a motor cover 6 that are connected to each other and form the outer shell of the cryogenic liquid cargo pump. Liquid discharge channels are formed inside both the intermediate section 1 and the motor cover 6. A liquid discharge pipe 12 is fixedly connected between the liquid discharge channel at the top of the motor cover 6 and the liquid discharge channel of the intermediate section 1, and the liquid discharge pipe 12 is arranged outside the motor housing 5. The discharge port of the liquid discharge channel in the motor cover 6 is connected to the liquid discharge pipeline in the cabin. The lower end of the motor cover 6 and the upper end of the flank 7 are fixed by bolts, and the flank 7 is arranged around the motor cover 6. Reinforcing ribs 902 in a "V" shape are fixed between the two sides at the lower end of the flank 7 and the surface of the corresponding main steel plate 901, thereby improving the rigidity of the connection between the main steel plate 901 and the flank 7. The upper end of each flank 7 is welded and fixed to the upper end of a fixed arc seat 8, and the fixed arc seat 8 is fixed to the installation end of the pump bracket 10 by bolts. The lower end of the pump bracket 10 is fixed on the foundation pit 11 at the bottom of the ship's cabin. The foundation pit 11 at the bottom of the ship's cabin is arranged at the bottom of the ship's cabin, and a gap for liquid flow is reserved between the lower end of the suction section 3 and the inside of the foundation pit 11 at the bottom of the ship's cabin.

[0055] Connect the external wires to the terminal block of this cryogenic liquid cargo pump. At the same time, fix and support the cryogenic liquid cargo pump through the flank 7 and the pump bracket 10 to make the cryogenic liquid cargo pump work normally, and make the suction section 3 of the cryogenic liquid cargo pump face downward. After the cryogenic liquid cargo pump is powered on, the internal motor works to drive the turbine to rotate, thereby pumping the cryogenic liquid inside the ship's cabin into the pump and transporting it through fluid channels, liquid delivery pipes, etc., and then transporting it to the outside through the long connection pipeline inside the ship's cabin, thereby realizing the basic functions.

[0056] An inducer is arranged inside the suction section 3. A set of ultra-low temperature rolling bearings is arranged behind the inducer, and then an impeller is installed. Guide vanes are arranged outside the impeller. After the medium is pressurized by the impeller, it flows into the next-stage impeller from the guide vanes. The guide vanes are arranged inside the cylinder body 2, and the motor housing 5 is the pump housing. The liquid enters from the suction section 3, is pressurized inside the cylinder body 2 and then discharged to the liquid discharge channel of the intermediate section 1, then passes through the liquid discharge pipe 12 outside the motor housing 5, then flows out through the liquid discharge channel of the motor cover 6, and finally is discharged from the long connection pipeline on the motor cover 6.

[0057] An intermediate bearing body is installed on the intermediate section 1, and a set of ultra-low temperature rolling bearings is installed inside. A balance drum chamber is arranged at the lower part of the intermediate bearing body, and a balance drum is installed. A fixed gap is formed between the balance drum and the balance drum chamber. A balance plate is also installed on the intermediate section 1, and a variable gap is formed between the balance plate and the impeller spacer on the pump shaft, jointly forming the axial force balance mechanism of the liquid cargo pump and undertaking the function of axial force balance.

[0058] The pump and the motor are coaxially designed. The impeller is connected by a taper bush. The low-temperature motor shaft is hollow, and the pump passes through the motor shaft and is connected by a spline to transmit torque. No shaft seal system is provided between the low-temperature motor and the pump, and both the stator and rotor of the low-temperature motor are immersed in the medium. The power cable and instrument cable of the low-temperature motor are led out from the motor cover 6 and exported outside the pump.

[0059] The low-temperature liquid cargo pump can also be installed in the B-type tank through the set pump base and the base plate at the bottom of the tank. A suction filter is fixedly installed at the inlet of the suction section 3 of the low-temperature liquid cargo pump to filter impurities in the medium, which is beneficial to the safe and reliable operation of the whole pump.

[0060] The pump and the low-temperature motor inside the low-temperature liquid cargo pump are jointly immersed in the liquid, so there will be no explosion, and it is safe and reliable. An inducer is set at the inlet of the pump. The characteristic of low net positive suction head (NPSH) can discharge the liquid in the cargo tank as much as possible, and the remaining amount is very small. The lubrication of the bearing and the cooling of the motor are both treated by forced liquid lubrication. The conveying medium is LNG, and the medium temperature is -163°C. The number of stages of the low-temperature liquid cargo pump is set to 2 stages, the flow rate is 500 m³ / h, and the head is 210 m. The shaft efficiency of the low-temperature liquid cargo pump is 78%. The motor power of the low-temperature motor is 250 KW, the synchronous speed is 3600 r / min, and the power supply is set to 440V / 60HZ.

[0061] Refer to Figures 1 - 3 , at both ends of the outer surface of the middle section 1, stop blocks 4 are fixed by screws. The two stop blocks 4 correspond to each other, and the head of the screw is located inside the stop block 4 to avoid protruding and interfering with the main steel plate 901, resulting in excessive friction. The stop block 4 is set as a rectangle and its surface is set as a smooth surface.

[0062] The stop block 4 is fixed to the middle section 1 to achieve an integrated design. When the stop block 4 is fixed, the low-temperature liquid cargo pump is fixed, realizing multiple fixations to further improve the installation stability of the low-temperature liquid cargo pump.

[0063] Refer to Figures 3 - 5, the clamping assembly 9 includes main steel plates 901 welded to both sides of the upper end of the fixed arc seat 8. Symmetric L-shaped plates 903 are arranged on both sides of the two main steel plates 901. Cushion plates 905 are fixedly provided on the opposite sides of the L-shaped plates 903. The cushion plates 905 are made of HDPE high-density polyethylene material. The cushion plates 905 are used to clamp and fix the stop block 4 and achieve buffering. A through counterbore 908 is opened in the middle of the cushion plate 905. A 2-mm gap is left between the lower end of the cushion plate 905 and the surface of the fixed arc seat 8 to avoid inconvenient movement of the L-shaped plate 903 due to excessive friction. The length and width dimensions of the cushion plate 905 are the same as those of one end of the L-shaped plate 903. An adjustment hole 907 is opened on the side of the L-shaped plate 903 away from the cushion plate 905. The length of the adjustment hole 907 is much larger than the diameter of the rod portion of the first bolt 904, thereby realizing the adjustment of lateral movement and further adjusting the distance between the two cushion plates 905. A first bolt 904 is movably penetrated between the adjustment hole 907 and the main steel plate 901. The first bolt 904 is used to fix the L-shaped plate 903 and the main steel plate 901. The head of the first bolt 904 is much larger than the height of the adjustment hole 907, thereby realizing the limiting effect.

[0064] The cushion plate 905 can also function to resist the vibration of the cryogenic cargo pump caused by the thermal expansion and contraction performance of metal materials during the process of the temperature of the cabin gradually changing from normal temperature to low temperature when LNG is injected into the cabin.

[0065] When the cryogenic cargo pump is initially fixed by the pump bracket 10 inside the cabin, at the same time, the installer also needs to place the stop block 4 between the two cushion plates 905 and leave a gap between the end of the stop block 4 and the surface of the main steel plate 901 to avoid the impact of the stop block 4 on the main steel plate 901 when the stop block 4 shakes, which reduces the fixing and buffering effects. Subsequently, the installer moves the two L-shaped plates 903 towards each other by a clamping tool or by hand to make the cushion plate 905 abut against the surface of the stop block 4. At the same time, the adjustment hole 907 slides on the surface of the rod portion of the first bolt 904. When it moves to a suitable position, the installer tightens the first bolt 904 through a tool, thereby achieving the fixing effect on the L-shaped plate 903, and using the nature of the stop block 4 itself to limit the shaking of the stop block 4 and achieve buffering to reduce the vibration during the operation of the cryogenic cargo pump, further improving the installation stability of the cryogenic cargo pump and making the bolt connection position not easy to loosen.

[0066] Refer to Figure 5 , a countersunk screw 906 is movably inserted into the countersunk hole 908. The rod portion of the countersunk screw 906 is threadedly fixed to the internal threaded hole at one end of the L-shaped plate 903. An internal threaded hole is opened in the middle of one end of the L-shaped plate 903. The head of the countersunk screw 906 is recessed into the countersunk hole 908.

[0067] Through the setting of the countersunk screw 906, the cushion plate 905 can be firmly fixed on the L-shaped plate 903, and it is convenient for maintenance and replacement.

[0068] The implementation principle of a marine cryogenic liquid cargo pump in an embodiment of the present application is as follows:

[0069] The installer installs it on the pump frame 10 through the fixed arc seats 8 on both sides of the cryogenic liquid cargo pump. At the same time, the stop block 4 is inserted between the backing plates 905 on both sides of the main steel plate 901. Subsequently, the installer pushes the two L-shaped plates 903 to drive the backing plates 905 to move, thereby clamping and fixing the stop block 4, and then fastening it with bolt one 904. When the cryogenic liquid cargo pump operates, vibrations will occur between the two backing plates 905, and then the energy will be consumed through the deformation of the backing plates 905 to achieve the effect of shock absorption and buffering.

[0070] It should be noted that the number of the stop block 4, the main steel plate 901, and the supporting structures can be designed according to actual needs, and at least two are provided.

[0071] Embodiment 2

[0072] Referring to Figures 6 - 8 , the difference between this embodiment and Embodiment 1 is that self-tightening components 9100 for automatically clamping the two opposite backing plates 905 are provided on both inner sides of the main steel plate 901 facing the backing plates 905. The self-tightening components 9100 include main chutes 9101 opened at both ends on one side of the main steel plate 901. The main chutes 9101 are not through slots. Rectangular middle chutes 9109 are opened on both the upper and lower sides at the opposite ends of the main chutes 9101. One end of the middle chutes 9109 extends to one end of the main chutes 9101, and the other end extends to the end of the oil cylinder housing 9106. A rectangular side chute 9108 is opened at the middle position of the opening of the main chutes 9101. One end of the side chute 9108 extends to the side close to the backing plate 905, and the other end extends to the position close to the end of the main chutes 9101, so that the side slider 9103 moves to the maximum position, and the distance between the two backing plates 905 is kept at the maximum. Oil cylinder housings 9106 are fixed at one end of the main chutes 9101 adjacent to the middle chutes 9109 and at one end of the side chutes 9108. An oil cavity is provided inside the oil cylinder housings 9106. A piston column two 9116 and a piston column one 9114 are respectively slidably provided at both ends of the oil cavity of the oil cylinder housing 9106. A plurality of annular grooves are opened at one end of the piston column two 9116 and the piston column one 9114 located inside the oil cylinder housing 9106. Sealing rings 9115 for sealing are sleeved in the plurality of annular grooves. A gap plate 9107 is movably provided on the inner wall of the main chutes 9101 on the side of the piston column one 9114. The side of the gap plate 9107 in contact with the surface of the piston column one 9114 is set as a plane, and the sides in contact with the force-bearing plate 9102 and the compensation strip 9111 are set as inclined surfaces.

[0073] Under normal conditions, one side of the front surface of the gap plate 9107 is in contact with the surface of the first piston column 9114, and the other side is in contact with the surface of the compensation strip 9111. One end of the compensation strip 9111 is fixedly provided with a force-bearing plate 9102 that slides inside the middle slideway 9109. At this time, under the reaction force of the spring 9113, the gap plate 9107 has a tendency to move forward.

[0074] An oil injection nozzle and an oil discharge nozzle (not shown in the figure) for injecting hydraulic oil are also provided on the surface of the oil cylinder housing 9106. The installer installs the stop block 4 between the two backing plates 905, and the surface of the stop block 4 is in contact with the force-bearing plate 9102 and applies pressure to make its surface and the surface of the compensation strip 9111 abut against the surface of the gap plate 9107. It should be noted that at this time, the installer needs to use a sheet-like tool to push the gap plate 9107 and squeeze the spring 9113, so that the distance between the force-bearing plate 9102 and the surface of the first piston column 9114 becomes smaller, and at the same time, the distance between the two backing plates 905 becomes larger. At the same time, the gap plate 9107 has the ability to adjust the distance between the two backing plates 905 to achieve the function of self-locking.

[0075] After the initial installation is completed, the user tightens the first bolt 904 with a tool. When the low-temperature liquid cargo pump is working, the vibration generated will continuously change the distance between the two opposite backing plates 905, and will also continuously cause the force-bearing plate 9102 to move frequently inside the middle slideway 9109. When the stop block 4 vibrates and squeezes the first piston column 9114 through the force-bearing plate 9102, the compensation strip 9111 and the gap plate 9107, the first piston column 9114 squeezes the hydraulic oil and moves in the direction of the second piston column 9116. At this time, it will drive the second piston column 9116 to move out of the oil cylinder housing 9106 by a certain distance. At this time, when the stop block 4 vibrates and moves in the opposite direction and is briefly separated from the force-bearing plate 9102, at this time, the force-bearing plate 9102 is not in contact with the stop block 4, so that the stop block 4 is in a free movement stage. Therefore, the gap plate 9107 loses its limiting function, and the gap plate 9107 is pushed to move under the reaction force of the spring 9113, and at the same time, the force-bearing plate 9102 is pushed to move in the direction of the stop block 4, so as to fill the distance between the force-bearing plate 9102 and the end face of the first piston column 9114. This setting will not cause the first piston column 9114 to enter the oil cylinder housing 9106 with a shorter length and be unable to contact the gap plate 9107. Combining the above actions, when the stop block 4 reciprocates, it can continuously squeeze the force-bearing plate 9102, and then continuously squeeze the first piston column 9114 through the compensation strip 9111 and the gap plate 9107, so that the second piston column 9116 moves out of the oil cylinder housing 9106. The above operation can realize the self-locking function of the two backing plates 905, and thus clamp the stop block 4 more firmly.

[0076] Refer to Figure 7, one side of the force-bearing plate 9102 away from the main steel plate 901 is embedded and fixed on one side of the backing plate 905, and the outer surface of the force-bearing plate 9102 is flush with the outer surface of the backing plate 905 and jointly abuts against the surface of the stop block 4.

[0077] When the distance between the two backing plates 905 continuously decreases, the stop block 4 is effectively clamped, which effectively avoids the increase in the distance caused by the wear and deformation of the backing plate 905, resulting in the inability of the stop block 4 to be clamped due to wear. At the same time, the backing plate 905 will drive the force-bearing plate 9102 to move together, which leads to an increase in the distance between the force-bearing plate 9102 and the piston column one 9114. This requires the gap plate 9107 to be filled.

[0078] Refer to Figures 7 - 9 , a connecting plate 9105 is fixedly provided on one side of the end of the piston column two 9116 away from the L-shaped plate 903. One end of the connecting plate 9105 away from the piston column two 9116 is rotatably provided with a rocker plate 9104 through a rotating shaft. The rocker plate 9104 is movably penetrated by a shaft one 9110 at one-third of the connecting plate 9105. The upper end of the shaft one 9110 penetrates and is fixed on the upper part of the main steel plate 901, and the lower end of the shaft one 9110 is fixedly connected to the inner wall of the main steel plate 901. One end of the rocker plate 9104 away from the connecting plate 9105 is movably penetrated by a shaft two 9117. The shaft two 9117 is rotatably provided in the notch on one side of the side slider 9103, and the upper half of the shaft two 9117 movably penetrates the upper part of the side slider 9103. Both ends of the side slider 9103 are slidably provided in the side chute 9108. The whole side slider 9103 is located within the opening of the main chute 9101. One side of the side slider 9103 is fixed to one side of the L-shaped plate 903 by two screws.

[0079] When the piston column two 9116 moves outward under the drive of hydraulic oil, it will drive the connecting plate 9105 and then push the rocker plate 9104 to rotate around the shaft one 9110. Under the action of the lever, it will drive the side slider 9103 to move in the side chute 9108. When the side slider 9103 moves, it will cause the rocker plate 9104 to rotate through the shaft two 9117, so that the moving direction of the side slider 9103 is opposite to that of the piston column two 9116. At this time, the side slider 9103 drives the L-shaped plate 903 to move, and then drives the two backing plates 905 to move towards each other under the action of the two oppositely arranged L-shaped plates 903, so as to achieve the clamping effect.

[0080] Refer to Figure 8 , three mounting holes 9112 arranged in an equidistant array are opened on one side of the gap plate 9107 away from the backing plate 905. The number of the mounting holes 9112 is at least three. The more the number, the more stable the connection of the gap plate 9107. Springs 9113 are fixedly provided at the bottom of the inner cavity of each mounting hole 9112. One end of the spring 9113 away from the bottom of the inner cavity of the mounting hole 9112 is fixed to the inner wall surface inside the main chute 9101.

[0081] Under normal conditions, the spring 9113 is in a compressed state. Therefore, when a gap is generated between the force-bearing plate 9102 and the first piston column 9114, under the reaction force of the spring 9113, the force-bearing plate 9102 is pushed to move, thereby filling the gap between the force-bearing plate 9102 and the first piston column 9114, so that each vibration of the force-bearing plate 9102 can cause extrusion on the first piston column 9114.

[0082] Refer to Figures 8 - 10 , on one side of the connecting plate 9105, the oil cylinder housing 9106 is fixedly provided with two symmetrically arranged movable seats 9118. A third shaft 9122 is fixedly penetrated between the two movable seats 9118. The middle part of the third shaft 9122 is movably penetrated through one end of the pawl 9119. A torsion spring 9121 is sleeved outside the third shaft 9122. One end of the torsion spring 9121 is fixed to the pawl 9119, and the other end of the torsion spring 9121 is fixed to one side of the movable seat 9118; on the side of the connecting plate 9105 facing the pawl 9119, a ratchet rack 9120 is fixedly provided. The ratchet rack 9120 is engaged and clamped with the pawl 9119 to achieve limit. Under the action of the torsion spring 9121, the pawl 9119 and the ratchet rack 9120 are always in contact to achieve clamping limit.

[0083] When the connecting plate 9105 moves, it will drive the ratchet rack 9120 to move, so that the pawl 9119 moves out of one tooth groove of the ratchet rack 9120 and slides on the surface of the ratchet rack 9120 to other tooth grooves and abuts under the reaction force of the torsion spring 9121, avoiding the reverse movement of the connecting plate 9105, thereby achieving the limit effect. Since the vibration amplitude of the stop block 4 is small, therefore, the tooth groove precision of the ratchet rack 9120 needs to be set and set in millimeters, thereby improving the clamping precision between the two backing plates 905.

[0084] The implementation principle of Embodiment 2 is as follows: First, place the stop block 4 between the two backing plates 905. Subsequently, the installer pushes the two L-shaped plates 903 to make the backing plates 905 abut against the stop block 4, and then fixes the L-shaped plates 903 to the side slider 9103 through screws.

[0085] When the stop block 4 vibrates, it will reciprocally push the force-bearing plate 9102, and then push the piston rod 9114 through the compensation bar 9111 and one side of the force-bearing plate 9102, and push the piston rod 9116 to move outward through the hydraulic oil inside the oil cylinder housing 9106. During the frequent movement of the force-bearing plate 9102, the spacer plate 9107 gradually inserts into the gap between the piston rod 9114 and the compensation bar 9111 under the action of the spring 9113, and then fills it, so that the force-bearing plate 9102 and the compensation bar 9111 can always push the piston rod 9114. The piston rod 9116 drives the connecting plate 9105 to move under the action of the piston rod 9114, and at the same time makes the pawl 9119 rotate around the shaft 9122 and slide on the ratchet rack 9120. At the same time, the connecting plate 9105 will push the rocker 9104 to rotate, and then drive the side slider 9103 to move through the shaft 9110. The side slider 9103 drives the L-shaped plate 903 and the backing plate 905 to move towards each other. Because the pawl 9119 and the ratchet rack 9120 are limited to prevent the connecting plate 9105 from retracting, therefore, under the action of the spacer plate 9107, the distance between the two backing plates 905 gradually becomes smaller, and then the self-locking fixation effect on the stop block 4 is realized, effectively avoiding the loosening of the stop block 4.

[0086] The above are only optional embodiments of the present disclosure and are not used to limit the present disclosure. For those skilled in the art, the present disclosure can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included within the protection scope of the present disclosure.

Claims

1. A marine cryogenic liquid cargo pump, characterized in that: The cryogenic liquid cargo pump comprises a middle section (1), a cylinder (2), a suction section (3), a motor housing (5) and a motor cover (6) which are connected to each other and constitute the outer shell of the cryogenic liquid cargo pump. A side wing (7) is fixedly provided around the lower end of the motor cover (6). A fixed arc seat (8) is fixedly provided at the lower end of each side wing (7). The fixed arc seat (8) is fixed to a foundation pit (11) at the bottom of the cabin through a pump frame (10). A gap for liquid flow is reserved between the lower end of the suction section (3) and the inside of the foundation pit (11) at the bottom of the cabin. Corresponding stop blocks (4) are fixedly provided at both ends of the middle section (1); A clamping assembly (9), comprising main steel plates (901) fixedly mounted on both sides of the upper end of the fixed arc seat (8), L-shaped plates (903) being arranged on both sides of the two main steel plates (901), and pads (905) for clamping and fixing the stop block (4) being fixedly mounted on opposite sides of the L-shaped plates (903); An adjustment hole (907) is provided on one side of the L-shaped plate (903) away from the backing plate (905), and a bolt (904) for fixing the L-shaped plate (903) and the main steel plate (901) is movably penetrated between the inside of the adjustment hole (907) and the main steel plate (901), and the backing plate (905) is made of HDPE high-density polyethylene; A countersunk hole (908) is provided in the middle of the backing plate (905), and the length and width of the backing plate (905) are the same as the length and width of one end of the L-shaped plate (903); A countersunk screw rod (906) threadedly fixed to one end of the L-shaped plate (903) is movably inserted into the countersunk hole (908), and the head of the countersunk screw rod (906) is sunken in the countersunk hole (908); The inner sides of the main steel plate (901) facing the backing plate (905) are provided with self-tightening components (9100) for automatically clamping the two opposite backing plates (905), the self-tightening components (9100) include main slide grooves (9101) opened at both ends of one side of the main steel plate (901), the upper and lower sides of the opposite end of the main slide groove (9101) are provided with middle slideways (9109), the main slide groove (9101) is provided with a side slide groove (9108) at the middle position of the opening, and the inner side of the main slide groove (9101) is adjacent to the middle slideway. A cylinder shell (9106) is fixedly arranged at one end of the main slideway (9109) and the side slideway (9108), and a piston column 2 (9116) and a piston column 1 (9114) are slidably arranged at the two ends of the cylinder shell (9106), and a sealing ring (9115) is sleeved on one end of the piston column 2 (9116) and the piston column 1 (9114) located inside the cylinder shell (9106), and a gap plate (9107) is movably arranged on the inner wall of the main slideway (9101) on one side of the piston column 1 (9114); Under normal conditions, the front surface of the gap plate (9107) is in contact with the surface of the piston column (9114) and the surface of the compensation bar (9111), and one end of the compensation bar (9111) is fixed with a force plate (9102) that slides inside the middle slideway (9109); The side of the force-bearing plate (9102) away from the main steel plate (901) is fixed to the side of the pad (905); the outer surface of the force-bearing plate (9102) is flush with the outer surface of the pad (905) and they are in contact with the surface of the stop block (4).

2. A marine cryogenic liquid cargo pump according to claim 1, characterized in that: Reinforcing ribs (902) are fixed between the two sides of the lower end of the side wing (7) and the surface of the main steel plate (901).

3. A cryogenic liquid cargo pump for a ship according to claim 1, characterized in that: A connecting plate (9105) is fixedly provided on one side of the end of the second piston column (9116) away from the L-shaped plate (903), and a seesaw (9104) is rotatably provided on one end of the connecting plate (9105). The seesaw (9104) is located at one third of the connecting plate (9105) and movably penetrates an axis (9110) fixedly connected to the main steel plate (901). The end of the seesaw (9104) away from the connecting plate (9105) is rotatably provided on one side of the side slider (9103) through the axis (9117), and both ends of the side slider (9103) are slidably provided in the side slide groove (9108), and the side slider (9103) is located in the opening of the main slide groove (9101), and the side slider (9103) is fixed to the L-shaped plate (903); Three mounting holes (9112) are provided on a side of the gap plate (9107) away from the pad plate (905), and springs (9113) fixedly connected to the inside of the main slide groove (9101) are fixedly provided at the bottom of the inner cavity of each mounting hole (9112).

4. A marine cryogenic liquid cargo pump according to claim 3, characterized in that: The oil cylinder shell (9106) is located on one side of the connecting plate (9105) and is fixed with two movable seats (9118); a third shaft (9122) is fixed between the two movable seats (9118); a pawl (9119) is rotatably arranged in the middle of the third shaft (9122); and a torsion spring (9121) is sleeved on the outside of the third shaft (9122) and is respectively fixedly connected to the pawl (9119) and the movable seat (9118); A ratchet bar (9120) is fixedly provided on one side of the connecting plate (9105) facing the pawl (9119) and is engaged with the pawl (9119). Under the action of the torsion spring (9121), the pawl (9119) and the ratchet bar (9120) are always in contact with each other to achieve engagement and limiting.

Images