Pressurizing and cooling equipment for liquefied natural gas production

Abstract

The invention discloses pressurized cooling equipment for liquefied natural gas production, and relates to the technical field of liquefied natural gas production.The equipment comprises an equipment body and a supporting frame, two gas conveying cylinders are symmetrically and fixedly connected to the outer wall of the supporting frame, and first gas conveying pipes are fixedly connected to the ends, away from the supporting frame, of the two gas conveying cylinders correspondingly; a switching cylinder is rotatably connected to the interior of the supporting frame, two filtering cylinders are symmetrically and slidably connected to the interior of the switching cylinder, two butt joint inserting grooves are symmetrically formed in the outer walls of the two filtering cylinders, and a butt joint mechanism used for being in sealed butt joint with the filtering cylinders is arranged on the air conveying cylinder. By means of the butt joint mechanism, natural gas leakage can be effectively avoided in the process of conveniently replacing the filter cartridge through sealed butt joint between the butt joint mechanism and the filter cartridge, so that the liquefied natural gas production efficiency is further improved, meanwhile, through cooperation of a first sealing rubber ring and a second sealing rubber ring, the sealing effect is good, and the sealing effect is good. And the sealing effect during butt joint with the filter cartridge can be effectively ensured.

Description

Technical Field

[0001] This invention relates to the field of liquefied natural gas (LNG) production technology, and more specifically to a pressurized cooling device for LNG production. Background Technology

[0002] Natural gas is a mixture of natural hydrocarbon gases found in underground rock formations. Its main component is methane, with small amounts of hydrocarbons such as ethane and propane, as well as non-hydrocarbon components (such as nitrogen and carbon dioxide). It is mostly found in underground rock formations. Liquefied natural gas (LNG), on the other hand, is a liquid product formed by cooling natural gas to approximately -162°C (at normal pressure). Its volume is about 1 / 600 of the same amount of gaseous natural gas, making it easy to store and transport. It is colorless, odorless, non-toxic, has a high ignition point, high calorific value, and low emissions of pollutants during combustion. In current LNG production, pressurized cooling equipment is used to pressurize and cool LNG to form it in order to increase the liquefaction temperature of natural gas and thus reduce cooling energy consumption.

[0003] A pressurized cooling device for liquefied natural gas (LNG) production, as described in patent CN118149554B, includes a shell with an inner wall insulated cavity filled with a mixture of nitrogen dioxide and nitrogen tetroxide. A spiral tube is fixed inside the insulated cavity. A pressurized pump is located on the outer side of the shell, and an air inlet is located on the inner side. The air inlet consists of inlet a and inlet b, and the spiral tube is composed of multiple spiral unit tubes. A proportional control valve is connected to the output end of the pressurized pump. This invention achieves heat preservation within the shell by using an insulated cavity filled with the mixed gas. Furthermore, the spiral tube absorbs any cold energy leaking into the insulated cavity through heat exchange, pre-cooling the liquefied natural gas and thus recovering energy, reducing the device's cooling energy consumption.

[0004] The above-mentioned scheme recovers energy through a heat-insulated chamber during the liquefaction and molding of processed natural gas, further reducing the cooling energy consumption of the device. However, in the natural gas processing stage, to avoid problems such as increased wear of the pressurization pump, blockage of cooling pipes, or decreased heat transfer efficiency caused by impurities (such as dust, sulfides, moisture, and heavy hydrocarbons), filter components (such as activated carbon plates and filter screens) are used to filter the natural gas. When the filter components fail due to mesh blockage or adsorption saturation, they need to be replaced to ensure efficient filtration of natural gas. However, when replacing the filter components in the existing device, the natural gas supply needs to be stopped to avoid natural gas leakage and secondary pollution from impurities, resulting in poor efficiency of liquefied natural gas production. Summary of the Invention

[0005] The purpose of this invention is to provide a pressurized cooling device for liquefied natural gas production, so as to solve the problem that existing equipment requires downtime to replace filter components, which affects production efficiency.

[0006] The technical solution of the present invention to solve the above-mentioned technical problems is as follows:

[0007] A pressurized cooling device for liquefied natural gas production includes: a main body of the device, a support frame at one end of the main body, two gas delivery cylinders symmetrically fixedly connected to the outer wall of the support frame, a first gas delivery pipe fixedly connected to the end of each gas delivery cylinder away from the support frame, a switching cylinder rotatably connected inside the support frame, two filter cylinders symmetrically slidably connected inside the switching cylinder, two docking slots symmetrically opened on the outer wall of each of the two filter cylinders, and a docking mechanism for sealing docking with the filter cylinders on the gas delivery cylinder;

[0008] The docking mechanism includes: a sealing push ring slidably connected inside the gas cylinder; a docking cylinder is fixedly connected to one end of the sealing push ring near the support frame; the outer wall of the docking cylinder away from the sealing push ring is frustoconical; multiple vent holes are equidistantly opened on the outer wall of the docking cylinder, and the multiple vent holes are interconnected with the inner cavity of the docking cylinder; the docking cylinder is used to extend into the corresponding docking slot and connect the corresponding gas cylinder and the corresponding filter cylinder through the vent holes.

[0009] Furthermore, the aforementioned docking mechanism also includes: a transmission assembly disposed on the support frame; the transmission assembly includes: a support rod fixedly connected to the inside of one side of the support frame, a toothed ring rotatably sleeved on the outer wall of the support rod, a first limiting ring integrally formed on the inner wall of the toothed ring, the first limiting ring being rotatably connected to the support rod, two racks symmetrically meshing on the outer wall of the toothed ring, both racks being slidably connected to the support frame, a torsion spring sleeved on the outer wall of the support rod, both ends of the torsion spring being integrally formed with end heads, and slots for inserting the end heads being provided at the joint positions of the support frame, the toothed ring, and the end heads.

[0010] Furthermore, the aforementioned support frame is provided with a first connecting assembly for driving the sealing push ring to move; the first connecting assembly includes: two first connecting plates symmetrically arranged on the outside of the support frame, two racks located between the two first connecting plates, the two first connecting plates being fixedly connected to the two racks respectively, two air supply cylinders located between the two first connecting plates, and a plurality of first movable push rods being fixedly connected circumferentially at equal intervals at the end of the sealing push ring away from the docking insert, the plurality of first movable push rods passing through the air supply cylinders and being fixedly connected to the first connecting plates, and the plurality of first movable push rods being slidably connected to the air supply cylinders.

[0011] Furthermore, the filter cartridge is provided with a sealing assembly for sealing the ports of the docking slots; the sealing assembly includes two sealing cover plates symmetrically arranged inside the filter cartridge by a support assembly, the two sealing cover plates being located at the ports of the two docking slots respectively, and the two sealing cover plates contacting the inner walls of both ends of the filter cartridge respectively.

[0012] Furthermore, the aforementioned support assembly includes: two support mesh plates symmetrically fixedly connected to the inner wall of the filter cylinder, the two support mesh plates being located between two sealing cover plates, and two fixed guide rods symmetrically fixedly connected to the ends of the two support mesh plates that are far apart from each other, the two fixed guide rods being fixedly connected to the filter cylinder, a docking slot being located between the two fixed guide rods, the sealing cover plate being slidably sleeved on the outer wall of the two fixed guide rods, and a first return spring being sleeved on the outer wall of the fixed guide rod, one end of the first return spring contacting the outer wall of the sealing cover plate, and the other end of the first return spring contacting the outer wall of the support mesh plate.

[0013] Furthermore, the support frame is provided with a switching mechanism for switching the positions of the two filter cylinders; the switching mechanism includes a pushing component provided on the support frame;

[0014] The pushing component includes: a hydraulic push rod installed on the support frame at the end away from the main body of the equipment; a guide push rod is fixedly connected to the output end of the hydraulic push rod; the guide push rod is located inside the switching cylinder and is slidably connected to the switching cylinder; a second connecting component and a guiding component are provided on the guide push rod.

[0015] Furthermore, the aforementioned second connecting assembly includes: a second movable push rod fixedly connected to the end of the guide push rod away from the hydraulic push rod; the second movable push rod passes through the switching cylinder to the outside of one end of the support frame; the second movable push rod is slidably connected to the switching cylinder and the support frame; a second connecting plate is fixedly connected to the end of the second movable push rod away from the guide push rod; the second connecting plate is L-shaped and located above two racks; a first connecting push block is fixedly connected to the bottom end of the second connecting plate; a second connecting push block is provided at one end of the first connecting push block; the second connecting push block is fixedly connected to a rack; and the second connecting plate, the first connecting push block, and the second connecting push block are all slidably connected to the support frame.

[0016] Furthermore, the aforementioned guide assembly includes: two limiting baffles symmetrically slidably connected inside the switching cylinder; a guide push rod located between the two limiting baffles; a guide slider fixedly connected to the side of each limiting baffle near the guide push rod; the outer wall of the guide slider away from the limiting baffle is hemispherical; the guide slider penetrates the switching cylinder to the interior of the guide push rod; the guide slider is slidably connected to the switching cylinder; a second return spring is provided on the side of the limiting baffle away from the guide slider; one end of the second return spring contacts the outer wall of the limiting baffle, and the other end of the second return spring contacts the inner wall of the switching cylinder.

[0017] Furthermore, a spiral guide groove is provided at the junction of the guide push rod and the guide slider for the guide slider to slide. A straight groove is provided at one end of the guide push rod located in the spiral guide groove for the guide slider to slide. A guide inclined groove is provided at the other end of the guide push rod located in the spiral guide groove for the guide slider to slide. The inner wall of the guide inclined groove at the end away from the spiral guide groove is interconnected with the inner wall at the junction of the straight groove and the spiral guide groove.

[0018] Furthermore, a pressure pump is installed on the outer wall of the main body of the above-mentioned equipment, a fixed frame is installed at one end of the support frame, the fixed frame is fixedly connected to the input end of the pressure pump through the second gas supply pipe, a gas cylinder is fixedly connected to the fixed frame through the first gas supply pipe, and a gas flow meter is installed inside the fixed frame.

[0019] The present invention has the following beneficial effects:

[0020] (1) The present invention, through the docking mechanism, can effectively prevent natural gas leakage during the process of convenient replacement of the filter cartridge by sealing the connection with the filter cartridge, thereby further improving the efficiency of liquefied natural gas production. At the same time, through the cooperation of the first sealing rubber ring and the second sealing rubber ring, the sealing effect when docking with the filter cartridge can be effectively guaranteed.

[0021] (2) The present invention can automatically release the blockage of the docking slot port when the docking plug and the filter cylinder are docked, and can automatically block the port of the docking slot when the filter component needs to be replaced, effectively avoiding secondary pollution of natural gas by impurities and greatly improving the safety and reliability of equipment operation.

[0022] (3) The present invention can drive the switching cylinder to rotate through the switching mechanism, so as to realize the convenient switching of the two filter cylinder positions. Through the cooperation with the docking mechanism, the docking cylinder and the filter cylinder can be automatically inserted and removed, further shortening the time required to replace the filter cylinder and effectively improving the continuity of liquefied natural gas production. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the internal structure of the main body of the device of the present invention;

[0025] Figure 3 This is a schematic diagram of the internal structure of the switching cylinder of the present invention;

[0026] Figure 4 This is a schematic diagram of the internal structure of the gas cylinder of the present invention;

[0027] Figure 5This is a schematic diagram of the connection structure between the guide push rod and the second movable push rod of the present invention;

[0028] Figure 6 This is a schematic diagram of the internal structure of the filter cartridge of the present invention;

[0029] Figure 7 For the present invention Figure 2 A magnified schematic diagram of the structure at point A in the diagram;

[0030] Figure 8 For the present invention Figure 3 A magnified schematic diagram of the structure at point B in the diagram.

[0031] In the diagram: 1. Main body of the equipment; 201. First connecting plate; 202. First moving push rod; 203. Sealing push ring; 204. Docking sleeve; 205. Second sealing rubber ring; 206. Fixed guide rod; 207. Support mesh plate; 208. Sealing cover plate; 209. First return spring; 2010. Rack; 2011. Torsion spring; 2012. Gear ring; 2013. Support rod; 2014. Exhaust port; 301. Hydraulic push rod; 302. Guide push rod; 303. Linear slide 304. Guide groove; 305. Spiral guide groove; 306. Second moving push rod; 307. Second connecting plate; 308. First connecting push block; 309. Guide slider; 3010. Limiting baffle; 3011. Second return spring; 3012. Second connecting push block; 4. Fixed frame; 5. Pressurizing pump; 6. Filter cartridge; 7. Support frame; 8. Docking slot; 9. Air supply cylinder; 10. Switching cylinder; 11. Ball bearing; 12. Docking insert plate; 13. Limiting slot; 14. Sealing cover plate. Detailed Implementation

[0032] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0033] like Figures 1-8As shown, a pressurized cooling device for liquefied natural gas production includes a main body 1. A support frame 7 is provided at one end of the main body 1. Two gas delivery cylinders 9 are symmetrically fixedly connected to the outer wall of the support frame 7. A first gas delivery pipe is fixedly connected to the end of each gas delivery cylinder 9 away from the support frame 7. A switching cylinder 10 is rotatably connected inside the support frame 7. Two filter cylinders 6 are symmetrically slidably connected inside the switching cylinder 10. Two docking slots 8 are symmetrically opened on the outer wall of each of the two filter cylinders 6. A first sealing rubber ring is fixedly connected to the inner wall of each of the two docking slots 8. Two sets of ball bearings 11 are symmetrically installed at the top of the filter cylinders 6. The outer wall of the filter cylinders 6 is symmetrically fixed. Two docking plates 12 are connected. A limiting slot 13 for sliding the docking plate 12 is provided at the position where the switching cylinder 10 connects with the docking plate 12. A sealing cover 14 is rotatably connected to the opening of the filter cylinder 6. The sealing cover 14 is fixedly connected to the filter cylinder 6 by bolts. A pressure pump 5 is installed on the outer wall of the main body 1. A fixed frame 4 is installed at one end of the support frame 7. The fixed frame 4 is fixedly connected to the input end of the pressure pump 5 through the second gas supply pipe. A gas supply cylinder 9 is fixedly connected to the fixed frame 4 through the first gas supply pipe. A gas flow meter is installed inside the fixed frame 4. A docking mechanism for sealing docking with the filter cylinder 6 is provided on the gas supply cylinder 9.

[0034] The docking mechanism includes: a sealing push ring 203 slidably connected inside the air supply cylinder 9; a docking tube 204 is fixedly connected to one end of the sealing push ring 203 near the support frame 7; the outer wall of the docking tube 204 away from the sealing push ring 203 is frustoconical; multiple exhaust holes 2014 are equidistantly opened on the outer wall of the docking tube 204 around its periphery; the multiple exhaust holes 2014 are all interconnected with the inner cavity of the docking tube 204; a second sealing rubber ring 205 is sleeved on the outer wall of the docking tube 204 at the port positions of the multiple exhaust holes 2014; and the second sealing rubber ring 205 is fixedly connected to the air supply cylinder 9.

[0035] The docking mechanism also includes: a transmission assembly set on the support frame 7; the transmission assembly includes: a support rod 2013 fixedly connected to the inside of one side of the support frame 7, a toothed ring 2012 rotatably sleeved on the outer wall of the support rod 2013, a first limiting ring integrally formed on the inner wall of the toothed ring 2012, the first limiting ring being rotatably connected to the support rod 2013, two racks 2010 symmetrically meshing on the outer wall of the toothed ring 2012, a torsion spring 2011 sleeved on the outer wall of the support rod 2013, both ends of the torsion spring 2011 being integrally formed with end heads, and slots for inserting the end heads being provided at the joint positions of the support frame 7, the toothed ring 2012 and the end heads.

[0036] In this embodiment, when in use, a filter cartridge 6 is vertically inserted into the top of the switching cylinder 10. At this time, through the cooperation of the docking plate 12 and the limiting slot 13, the switching cylinder 10 can slide and limit the filter cartridge 6, so as to facilitate the convenient installation of the filter cartridge 6.

[0037] Then, the switching mechanism can drive the switching cylinder 10 to drive the filter cylinder 6 to rotate inside the support frame 7. When the filter cylinder 6 moves between the two air supply cylinders 9, the two docking slots 8 move to the ports of the two air supply cylinders 9 respectively under the drive of the filter cylinder 6. At the same time, through the cooperation of the switching mechanism and the docking mechanism, the purpose of sealing the docking insert 204 with the filter cylinder 6 can be achieved.

[0038] Then, the pressurization pump 5 is started, and natural gas can be transported through the first gas pipeline, the second gas pipeline and the fixed frame 4. During this process, impurities in the natural gas can be filtered through the activated carbon plate, and the filtered natural gas is transported to the interior of the main body 1 of the equipment. In this way, the liquefied natural gas can be pressurized and cooled to form through the main body 1 of the equipment. During this process, the flow rate of the filtered natural gas can be monitored in real time through the gas flow meter.

[0039] When the gas flow meter detects insufficient natural gas flow, the above operation can be repeated through the cooperation of the switching mechanism and the docking mechanism. This allows for convenient replacement of the filter cartridge 6, thereby further improving the efficiency of liquefied natural gas production and effectively avoiding adverse situations such as natural gas leakage and secondary pollution from impurities.

[0040] like Figure 1-Figure 4 As shown, the support frame 7 is provided with a first connecting assembly for moving the sealing push ring 203. The first connecting assembly includes: two first connecting plates 201 symmetrically arranged on the outside of the support frame 7; two racks 2010 located between the two first connecting plates 201; the two first connecting plates 201 are fixedly connected to the two racks 2010 respectively; two air supply cylinders 9 are located between the two first connecting plates 201; and multiple first moving push rods 202 are fixedly connected circumferentially at equal intervals to one end of the sealing push ring 203 away from the docking cylinder 204. The multiple first moving push rods 202 all pass through the air supply cylinders 9 and are fixedly connected to the first connecting plates 201. The multiple first moving push rods 202 are all slidably connected to the air supply cylinders 9. Through the fixed connection between the two first connecting plates 201 and the two racks 2010, the two first connecting plates 201 can be driven by the two racks 2010 respectively, and through the first moving push rods 202 and the sealing push ring 203, push the docking cylinder 204 and the filter cylinder 6 to seal and dock.

[0041] like Figures 2-6 As shown, the filter cartridge 6 is provided with a sealing assembly for sealing the ports of the docking slots 8. The sealing assembly includes two sealing cover plates 208 symmetrically arranged inside the filter cartridge 6. The two sealing cover plates 208 are respectively located at the ports of the two docking slots 8, and the two sealing cover plates 208 are in contact with the inner walls of both ends of the filter cartridge 6.

[0042] A support assembly is provided on the filter cartridge 6. The support assembly includes: two support mesh plates 207 symmetrically fixedly connected to the inner wall of the filter cartridge 6, the two support mesh plates 207 being located between two sealing cover plates 208, and two fixing guide rods 206 symmetrically fixedly connected to the ends of the two support mesh plates 207 that are far apart from each other. Both fixing guide rods 206 are fixedly connected to the filter cartridge 6. A docking slot 8 is located between the two fixing guide rods 206. The sealing cover plates 208 are slidably sleeved on the outer walls of the two fixing guide rods 206. A first return spring 209 is sleeved on the outer wall of the fixing guide rods 206. One end of the spring 209 contacts the outer wall of the sealing cover plate 208, and the other end of the first return spring 209 contacts the outer wall of the support mesh plate 207. The filter cylinder 6 is located between the two support mesh plates 207 and an activated carbon plate is installed. Through the cooperation of the sealing component and the support component, the sealing of the port of the docking slot 8 can be automatically released when the docking insert 204 and the filter cylinder 6 are sealed together. When the activated carbon plate needs to be replaced, the port of the docking slot 8 can be automatically sealed, effectively avoiding natural gas leakage and secondary pollution of impurities.

[0043] like Figures 1-8 As shown, a switching mechanism for switching the positions of the two filter cylinders 6 is provided on the support frame 7. The switching mechanism includes a pushing component provided on the support frame 7. The pushing component includes a hydraulic push rod 301 installed on the end of the support frame 7 away from the main body 1. The output end of the hydraulic push rod 301 is fixedly connected to a guide push rod 302. The guide push rod 302 is located inside the switching cylinder 10 and is slidably connected to the switching cylinder 10. A second connecting component and a guiding component are provided on the guide push rod 302.

[0044] The second connecting component includes: a second movable push rod 306 fixedly connected to the end of the guide push rod 302 away from the hydraulic push rod 301; the second movable push rod 306 passes through the switching cylinder 10 to the outside of one end of the support frame 7; the second movable push rod 306 is slidably connected to the switching cylinder 10 and the support frame 7; a second connecting plate 307 is fixedly connected to the end of the second movable push rod 306 away from the guide push rod 302; the second connecting plate 307 is L-shaped and located above the two racks 2010; a first connecting push block 308 is fixedly connected to the bottom end of the second connecting plate 307; a second connecting push block 3012 is provided at one end of the first connecting push block 308; the second connecting push block 3012 is fixedly connected to one rack 2010; the second connecting plate 307, the first connecting push block 308, and the second connecting push block 3012 are all slidably connected to the support frame 7; through the cooperation of the pushing component and the second connecting component, a moving thrust can be provided to one rack 2010.

[0045] like Figures 3-8As shown, the guide assembly includes: two limiting baffles 3010 symmetrically slidably connected inside the switching cylinder 10; a guide push rod 302 located between the two limiting baffles 3010; a guide slider 309 fixedly connected to the side of each limiting baffle 3010 near the guide push rod 302; the outer wall of the guide slider 309 away from the limiting baffle 3010 is hemispherical; the guide slider 309 penetrates the switching cylinder 10 to the inside of the guide push rod 302; the guide slider 309 is slidably connected to the switching cylinder 10; a second return spring 3011 is provided on the side of the limiting baffle 3010 away from the guide slider 309; one end of the second return spring 3011 contacts the outer wall of the limiting baffle 3010; and the other end of the second return spring 3011 contacts the inner wall of the switching cylinder 10.

[0046] A spiral guide groove 305 is provided at the junction of the guide push rod 302 and the guide slider 309 for the guide slider 309 to slide. A straight groove 303 is provided at one end of the guide push rod 302 located in the spiral guide groove 305 for the guide slider 309 to slide. A guide inclined groove 304 is provided at the other end of the guide push rod 302 located in the spiral guide groove 305 for the guide slider 309 to slide. The inner wall of the guide inclined groove 304 away from the spiral guide groove 305 is interconnected with the inner wall of the straight groove 303 and the spiral guide groove 305 at the junction. The depth of the inner wall of the guide inclined groove 304 near the straight groove 303 is greater than the depth of the inner wall of the other end. Through the cooperation of the straight groove 303, the guide inclined groove 304 and the spiral guide groove 305, the switching cylinder 10 can be driven to rotate automatically while the guide push rod 302 is pushed to move.

[0047] The above embodiment provides a pressurized cooling device for liquefied natural gas production. In use, a filter cylinder 6 is vertically inserted into the top of the switching cylinder 10. At this time, through the cooperation of the docking plate 12 and the limiting slot 13, the switching cylinder 10 can slide and limit the filter cylinder 6, so as to facilitate the convenient installation of the filter cylinder 6.

[0048] Then, the hydraulic push rod 301 is activated to push the guide push rod 302 to slide along the inner wall of the switching cylinder 10. At this time, the guide push rod 302 squeezes the outer wall of the guide slider 309 through the spiral guide groove 305. At the same time, the guide slider 309, under the squeezing and guidance of the inner wall of the spiral guide groove 305, drives the switching cylinder 10 to rotate inside the support frame 7 along the outer wall of the guide push rod 302 and the second moving push rod 306. At this time, the filter cylinder 6 moves synchronously under the drive of the switching cylinder 10. When the filter cylinder 6 contacts the inner wall of the support frame 7, the filter cylinder 6 slides along the inner wall of the support frame 7 through the ball bearing 11. During this process, the second connecting plate 307 drives the first connecting push block 308 to move synchronously under the push of the guide push rod 302 through the second moving push rod 306, so that the position of the filter cylinder 6 can be automatically adjusted.

[0049] When the filter cylinder 6 moves between the two air supply cylinders 9, the two docking slots 8 move to the ports of the two air supply cylinders 9 respectively under the drive of the filter cylinder 6. At the same time, the guide push rod 302 moves so that the guide slider 309 can separate from the outer wall of the spiral guide groove 305 and contact the inner wall of the straight slide groove 303. At this time, the first connecting push block 308, driven by the second connecting plate 307, contacts the outer wall of the second connecting push block 3012. Then the hydraulic push rod 301 pushes the guide push rod 302 to continue moving, so that the guide slider 309 can slide along the inner wall of the straight slide groove 303.

[0050] During this process, one rack 2010, driven by the second connecting push block 3012, drives the gear ring 2012 to rotate along the outer wall of the support rod 2013 through meshing. At this time, the gear ring 2012 twists the torsion spring 2011 through rotation. Simultaneously, the other rack 2010 moves synchronously under the meshing drive of the gear ring 2012, thereby enabling the two racks 2010 to move in opposite directions. At this time, the two first connecting plates 201, driven by the two racks 2010 respectively, push the sealing push ring 20 through multiple first moving push rods 202. 3. Move along the inner wall of the air supply cylinder 9. At the same time, the docking insert 204, under the push of the sealing push ring 203, slides along the inner wall of the air supply cylinder 9 and the docking slot 8 and is inserted into the interior of the filter cylinder 6, and contacts the outer wall of the sealing cover plate 208. At this time, the sealing cover plate 208 is separated from the inner wall of the filter cylinder 6 under the push of the docking insert 204 and slides along the outer wall of the fixed guide rod 206. At the same time, the sealing cover plate 208 retracts by moving and squeezing the first reset spring 209, thereby releasing the seal on the port of the docking slot 8.

[0051] When the guide slider 309 contacts the inner wall of the straight slide groove 303 away from the spiral guide groove 305, the exhaust hole 2014 moves into the interior of the filter cylinder 6 under the drive of the docking insert 204, so that the inner cavity of the filter cylinder 6 can communicate with the inner cavities of the two air supply cylinders 9. At the same time, through the cooperation of the first sealing rubber ring and the second sealing rubber ring 205, the purpose of sealing the docking insert 204 and the filter cylinder 6 can be achieved.

[0052] Then, the pressurization pump 5 is started, and natural gas can be transported through the first gas pipeline, the second gas pipeline and the fixed frame 4. During this process, impurities in the natural gas can be filtered through the activated carbon plate, and then the filtered natural gas is transported to the inside of the main body 1 of the equipment. In this way, the liquefied natural gas can be pressurized and cooled to form through the main body 1 of the equipment. During this process, the flow rate of the filtered natural gas can be monitored in real time through the gas flow meter.

[0053] When the gas flow meter detects insufficient natural gas flow, the hydraulic push rod 301 is activated to drive the guide push rod 302 to reset, automatically releasing the sealing connection between the docking sleeve 204 and the filter cartridge 6. During this process, when the guide slider 309 contacts the inner wall of the guide groove 304, the guide slider 309, under the pressure of the inner wall of the guide groove 304, pushes the limiting baffle 3010 to slide along the inner wall of the switching cylinder 10. At the same time, the limiting baffle 3010 retracts by moving and pressing the second reset spring 3011. When the guide slider 309 separates from the inner wall of the guide groove 304, the second reset spring 3011 rebounds and pushes the limiting baffle 3010 to slide back to its original position, allowing the guide slider 309 to be inserted into the spiral guide groove 305. The above operation is repeated to facilitate the replacement of the filter cartridge 6, thereby further improving the efficiency of liquefied natural gas production and effectively avoiding adverse situations such as natural gas leakage and secondary pollution from impurities.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pressurized cooling device for liquefied natural gas production, characterized in that, include: The main body of the equipment (1) is provided with a support frame (7) at one end. Two air supply cylinders (9) are symmetrically fixedly connected to the outer wall of the support frame (7). The two air supply cylinders (9) are fixedly connected to the end away from the support frame (7) with a first air supply pipe. A switching cylinder (10) is rotatably connected inside the support frame (7). Two filter cylinders (6) are symmetrically slidably connected inside the switching cylinder (10). Two docking slots (8) are symmetrically opened on the outer wall of the two filter cylinders (6). A docking mechanism for sealing docking with the filter cylinders (6) is provided on the air supply cylinder (9). The docking mechanism includes: a sealing push ring (203) slidably connected inside the air supply cylinder (9), and a docking plug (204) fixedly connected to one end of the sealing push ring (203) near the support frame (7). The outer wall of the docking plug (204) away from the sealing push ring (203) is frustoconical. Multiple exhaust holes (2014) are equidistantly opened on the outer wall of the docking plug (204) in the circumferential direction. The multiple exhaust holes (2014) are all interconnected with the inner cavity of the docking plug (204). The docking plug (204) is used to extend into the corresponding docking slot (8) and connect the corresponding air supply cylinder (9) and the corresponding filter cylinder (6) through the exhaust holes (2014).

2. The pressurized cooling equipment for liquefied natural gas production according to claim 1, characterized in that, The docking mechanism further includes: a transmission component set on the support frame (7); the transmission component includes: a support rod (2013) fixedly connected to the inside of one side of the support frame (7), a toothed ring (2012) is rotatably sleeved on the outer wall of the support rod (2013), a first limiting ring is integrally formed on the inner wall of the toothed ring (2012), the first limiting ring is rotatably connected to the support rod (2013), two racks (2010) are symmetrically meshed on the outer wall of the toothed ring (2012), both racks (2010) are slidably connected to the support frame (7), a torsion spring (2011) is sleeved on the outer wall of the support rod (2013), both ends of the torsion spring (2011) are integrally formed with end heads, and the support frame (7), the toothed ring (2012) and the end head are all provided with holes and slots for the end head to be inserted at the joint positions.

3. The pressurized cooling equipment for liquefied natural gas production according to claim 2, characterized in that, The support frame (7) is provided with a first connecting component for moving the sealing push ring (203); the first connecting component includes: two first connecting plates (201) symmetrically arranged on the outside of the support frame (7), two racks (2010) located between the two first connecting plates (201), the two first connecting plates (201) being fixedly connected to the two racks (2010) respectively, two air cylinders (9) being located between the two first connecting plates (201), and a plurality of first moving push rods (202) being fixedly connected circumferentially at equal intervals at one end of the sealing push ring (203) away from the docking cylinder (204), the plurality of first moving push rods (202) passing through the air cylinder (9) and being fixedly connected to the first connecting plate (201), and the plurality of first moving push rods (202) being slidably connected to the air cylinder (9).

4. The pressurized cooling equipment for liquefied natural gas production according to claim 2, characterized in that, The filter cylinder (6) is provided with a sealing component for sealing the port of the docking slot (8); the sealing component includes two sealing cover plates (208) symmetrically arranged inside the filter cylinder (6) by a support component, the two sealing cover plates (208) are respectively located at the port of the two docking slots (8), and the two sealing cover plates (208) are respectively in contact with the inner walls of both ends of the filter cylinder (6).

5. A pressurized cooling device for liquefied natural gas production according to claim 4, characterized in that, The support assembly includes: two support mesh plates (207) symmetrically fixedly connected to the inner wall of the filter cylinder (6), the two support mesh plates (207) being located between two sealing cover plates (208), two fixed guide rods (206) symmetrically fixedly connected to the ends of the two support mesh plates (207) that are far apart from each other, the two fixed guide rods (206) being fixedly connected to the filter cylinder (6), the docking slot (8) being located between the two fixed guide rods (206), the sealing cover plate (208) being slidably sleeved on the outer wall of the two fixed guide rods (206), a first return spring (209) being sleeved on the outer wall of the fixed guide rod (206), one end of the first return spring (209) contacting the outer wall of the sealing cover plate (208), and the other end of the first return spring (209) contacting the outer wall of the support mesh plate (207).

6. A pressurized cooling device for liquefied natural gas production according to claim 2, characterized in that, The support frame (7) is provided with a switching mechanism for switching the positions of the two filter cylinders (6); the switching mechanism includes a push component provided on the support frame (7); The pushing component includes: a hydraulic push rod (301) installed on the support frame (7) at the end away from the main body (1), the output end of the hydraulic push rod (301) is fixedly connected to a guide push rod (302), the guide push rod (302) is located inside the switching cylinder (10), and the guide push rod (302) is slidably connected to the switching cylinder (10); a second connecting component and a guiding component are provided on the guide push rod (302).

7. A pressurized cooling device for liquefied natural gas production according to claim 6, characterized in that, The second connecting assembly includes: a second movable push rod (306) fixedly connected to the end of the guide push rod (302) away from the hydraulic push rod (301), the second movable push rod (306) passing through the switching cylinder (10) to the outside of one end of the support frame (7), the second movable push rod (306) being slidably connected to the switching cylinder (10) and the support frame (7), and a second connecting plate (307) fixedly connected to the end of the second movable push rod (306) away from the guide push rod (302), the second connecting plate (307) having a shape The second connecting plate (307) is located above two racks (2010) and is L-shaped. The bottom end of the second connecting plate (307) is fixedly connected to a first connecting push block (308). One end of the first connecting push block (308) is provided with a second connecting push block (3012). The second connecting push block (3012) is fixedly connected to a rack (2010). The second connecting plate (307), the first connecting push block (308), and the second connecting push block (3012) are all slidably connected to the support frame (7).

8. A pressurized cooling device for liquefied natural gas production according to claim 6, characterized in that, The guiding assembly includes two limiting baffles (3010) symmetrically slidably connected inside the switching cylinder (10), a guide push rod (302) located between the two limiting baffles (3010), and a guide slider (309) fixedly connected to the side of each of the two limiting baffles (3010) near the guide push rod (302). The outer wall of the guide slider (309) away from the limiting baffle (3010) is hemispherical. The guide slider (309) penetrates through the switching cylinder (10) to the inside of the guide push rod (302). The guide slider (309) is slidably connected to the switching cylinder (10). A second return spring (3011) is provided on the side of the limiting baffle (3010) away from the guide slider (309). One end of the second return spring (3011) contacts the outer wall of the limiting baffle (3010), and the other end of the second return spring (3011) contacts the inner wall of the switching cylinder (10).

9. A pressurized cooling device for liquefied natural gas production according to claim 8, characterized in that, A spiral guide groove (305) is provided at the junction of the guide push rod (302) and the guide slider (309) for the guide slider (309) to slide. A straight slide groove (303) is provided at one end of the guide push rod (302) located in the spiral guide groove (305) for the guide slider (309) to slide. A guide inclined groove (304) is provided at the other end of the guide push rod (302) located in the spiral guide groove (305) for the guide slider (309) to slide. The inner wall of the guide inclined groove (304) away from the spiral guide groove (305) is interconnected with the inner wall of the straight slide groove (303) and the spiral guide groove (305) at the junction.

10. A pressurized cooling device for liquefied natural gas production according to claim 1, characterized in that, A pressurizing pump (5) is installed on the outer wall of the main body (1) of the equipment. A fixed frame (4) is installed at one end of the support frame (7). The fixed frame (4) is fixedly connected to the input end of the pressurizing pump (5) through the second gas supply pipe. A gas supply cylinder (9) is fixedly connected to the fixed frame (4) through the first gas supply pipe. A gas flow meter is installed inside the fixed frame (4).

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