An anti-icing active protection type LNG pneumatic liquid filling gun and liquid filling method

Abstract

The present invention provides an anti-icing active protection type LNG pneumatic liquid filling gun and a liquid filling method, which relates to the technical field of natural gas equipment. The liquid filling gun includes a locking mechanism, a sealing mechanism, a cylinder and a controller. The locking mechanism includes an outer shell sleeve, a support screw rod, a connecting rod and a claw. The claw is installed on the outer shell sleeve, and the outer shell sleeve is installed on the cylinder body through the support screw rod. The sealing mechanism includes a collision cylinder, a valve core thimble, a valve core and a connecting rod. The valve core thimble is connected to the valve core, and the valve core thimble moves to block the inner conical surface of the collision cylinder. The cylinder includes a cylinder body, a cylinder rod and a cylinder head, which provides power for the liquid filling gun. The controller includes a controller body and a controller valve core. The controller adjusts the displacement of the cylinder rod by accessing compressed air. When using the liquid filling gun to fill the gas cylinder, during the operation process, point injection of liquid is carried out through the porous holes at the front end of the collision cylinder. The surface of the connecting rod and the collision cylinder is coated with silica aerogel to isolate temperature conduction, and superhydrophobic coating is also used to avoid water droplets from adhering, effectively avoiding icing.

Description

Technical Field

[0001] The present invention relates to the technical field of natural gas equipment, and in particular to an anti-icing active protection type LNG pneumatic filling gun and a filling method thereof. Background Art

[0002] At present, LNG pneumatic filling guns are divided into straight-through type and angle type pneumatic filling guns. Both types of filling guns use compressed air to drive the cylinder to work to achieve connection with the filling port of the gas cylinder. The medium channel of the straight-through type filling gun passes through the cylinder; the angle type pneumatic filling gun feeds liquid from the middle section of the filling gun, and the medium channel does not pass through the cylinder. Both types of filling guns use the gap flow-through method for filling and feeding. The LNG medium flows into the gas cylinder through the gap between the medium channel opening of the filling gun and the filling port of the gas cylinder. In terms of anti-icing technology, the straight-through type and angle type pneumatic filling guns mainly adopt the vacuum valve and the flow direction change method, and their main purpose is to protect the cylinder to work for a longer time.

[0003] In the prior art, the LNG pneumatic filling gun uses the gap flow-through method for liquid feeding, resulting in low filling efficiency and long filling time. The application of the cylinder vacuum technology or the medium flow direction change technology in the pneumatic filling gun only aims to make the cylinder freeze as little as possible, but it has little effect on the main executing components of the filling gun. Due to the fast speed of metal heat conduction, the cylinder vacuum technology and the medium flow direction change technology can only play a role in protecting the cylinder from freezing for a short time. The temperature will conduct from the connection between the executing mechanism of the filling gun and the cylinder, and slowly generate condensate gas, resulting in icing. Even if it is made into an angle type, the fundamental problem cannot be solved, and the icing of the executing mechanism of the filling gun will also cause abnormal continuous filling. From a safety perspective, the prior art cannot prevent the occurrence of liquid spraying accidents. Due to the limitation of its structure, when the LNG filling gun is removed after filling, if the inner seal module thimble screw is loose and the thimble falls off, a subsequent liquid spraying accident will occur, causing property and life hazards. In order to solve the problem of icing of the filling gun and improve the safety of the filling gun, it is necessary to further improve the existing filling gun structure. Summary of the Invention

[0004] In order to solve the problem of condensation and icing of the main executing components of the LNG pneumatic filling gun and prevent liquid spraying accidents to ensure the safety of LNG filling, the present invention provides an anti-icing active protection type LNG pneumatic filling gun and a filling method thereof, and the specific technical solutions are as follows.

[0005] An anti-icing active protection type LNG pneumatic filling gun, comprising a locking mechanism, a sealing mechanism, a cylinder and a controller. The locking mechanism includes an outer shell sleeve, a support screw rod, a connecting rod and a claw. A pulley is arranged on the claw. The claw is installed on the outer shell sleeve through a pin and a snap spring. The outer shell sleeve is installed on the cylinder body through the support screw rod. The sealing mechanism includes a collision cylinder, a valve core thimble, a valve core and a connecting rod. A sealing gasket is fixed between the valve core thimble and the valve core. The valve core thimble is matched with the inner conical surface of the collision cylinder. The cylinder includes a cylinder body, a cylinder rod and a cylinder head. The cylinder body is connected with the cylinder rod, and the end of the cylinder is provided with the cylinder head. The controller includes a controller body and a controller valve core. The controller body is connected with the controller valve core. The controller button is installed at the end of the controller valve core. The controller adjusts the displacement of the cylinder rod by accessing compressed air.

[0006] Preferably, the collision cylinder is a hollow cylinder. A plurality of liquid inlet holes are arranged at the front end of the collision cylinder, and an inner conical surface is also arranged inside the collision cylinder.

[0007] Preferably, the connecting rod and the collision cylinder are coated with silica aerogel on the surface of the components.

[0008] Also preferably, superhydrophobic coatings are provided on the surfaces of the outer shell sleeve, the claw, the cylinder body, the cylinder rod and the cylinder head.

[0009] Also preferably, the middle flange of the connecting rod is connected with the front flange of the cylinder rod, and an air isolation chamber is formed between the connecting rod and the inner cavity of the cylinder rod.

[0010] Also preferably, a handle bracket is further arranged on the side surface of the cylinder head, and the handle is fixed on the handle bracket.

[0011] Also preferably, a connecting thread is arranged at the end of the connecting rod, and the connecting rod is connected with the LNG gas source pipeline.

[0012] An LNG pneumatic filling method, using the above-mentioned anti-icing active protection type LNG pneumatic filling gun. The filling process includes: connecting the filling gun and the gas cylinder filling port, pulling the controller button, injecting compressed air into the bottom of the cylinder through the controller valve core, the cylinder rod moves forward under the force, the cylinder rod pushes the connecting rod and the collision cylinder to move forward, the claw slides along the outer surface of the collision cylinder and then locks inward, the collision cylinder continues to move forward until the valve core thimble contacts the filling port valve core, opening the filling port valve core will simultaneously push the valve core thimble to move backward, establishing a medium circulation channel, and performing the filling operation.

[0013] Further preferably, after the filling operation is completed, the operation process includes: pushing the controller button, injecting compressed air into the top of the cylinder through the control valve core, the cylinder rod moves backward under the force, the connecting rod and the impact cylinder move backward simultaneously, closing the filling port, and at the same time, under the action of the spring, the valve core thimble moves forward, and the valve core thimble cooperates with the inner conical surface of the impact cylinder to complete the sealing, the moving path of the pulley on the claw changes, the claw opens, and the liquid filling gun is disassembled.

[0014] Even further preferably, during the liquid filling process, the cylinder pushes forward, the claw pulley locks inward along the concave-convex guiding groove on the outer surface of the impact cylinder, and the impact cylinder accesses the filling port; after the filling operation is completed, the cylinder moves backward, the impact cylinder leaves the gas cylinder filling port, the claw pulley opens outward along the concave-convex guiding groove on the outer surface of the impact cylinder, and the liquid filling gun is removed.

[0015] The beneficial effects of the anti-icing active protection type LNG pneumatic liquid filling gun and the liquid filling method provided by the present invention are as follows: the liquid filling gun adopts the point spraying technology, which improves the filling efficiency; the structure of the equipment is simpler, the processing difficulty is small, and the manufacturing cost is low; the silica aerogel technology and the hydrophobic coating are set on the surface of the components, ensuring the continuous filling work of the liquid filling gun, avoiding the problem of icing of the liquid filling gun, and reducing the maintenance cost; the active protection of the liquid filling gun can ensure safe production, and the setting of the flange structure is more conducive to replacing the sealing components. Description of the Drawings

[0016] Figure 1 is the structural explosion diagram of the anti-icing active protection type LNG pneumatic liquid filling gun;

[0017] Figure 2 is the structural schematic diagram of the anti-icing active protection type LNG pneumatic liquid filling gun;

[0018] Figure 3 is the cross-sectional view of the anti-icing active protection type LNG pneumatic liquid filling gun;

[0019] Figure 4 is the front view of the anti-icing active protection type LNG pneumatic liquid filling gun;

[0020] Figure 5 is the side view of the anti-icing active protection type LNG pneumatic liquid filling gun;

[0021] Figure 6 is the top view of the anti-icing active protection type LNG pneumatic liquid filling;

[0022] Figure 7 is the top view of the anti-icing active protection type LNG pneumatic liquid filling;

[0023] Figure 8 is the sectional schematic diagram of the controller;

[0024] In the figure: 1-housing sleeve, 2-support screw, 3-impact cylinder, 4-valve core ejector pin, 5-valve core, 6-connecting rod, 7-claw, 8-cylinder body, 9-controller body, 10-handle frame, 11-cylinder rod, 12-cylinder cover, 13-controller valve core, 14-controller button, 15-handle, 16-air isolation chamber, 17-pulley, 18-spring, 19-liquid inlet. DETAILED DESCRIPTION

[0025] Combination Figures 1 to 8 As shown, the specific implementation of an anti-icing active protection type LNG pneumatic liquid filling gun and a liquid filling method provided by the present invention is described.

[0026] An anti-icing active protection type LNG pneumatic liquid filling gun comprises a locking mechanism, a sealing mechanism, a cylinder and a controller. The locking mechanism cooperates with the gas injection port of the gas cylinder. The impact cylinder of the sealing mechanism ensures the sealing of the interface during the transportation process and when the transportation is stopped. The cylinder uses compressed gas.

[0027] Among them, the locking mechanism includes an outer shell 1, a support screw 2, a connecting rod 6 and a claw 7, as well as a sealing ring retaining ring, a pin and a screw, etc. A pulley is arranged on the claw 7, and the pulley 17 moves with the claw. The claw 7 is installed on the outer shell 1 through a pin and a retaining ring. The outer shell 1 is provided with a guide groove, and the pulley 17 moves along the guide groove. The outer shell 1 is installed on the cylinder body through a support screw, and both ends of the support screw 2 are provided with threads. The locking mechanism can realize opening and closing and locking, which facilitates the gas injection operation and ensures the safety of gas injection. The outer shell 1 is installed on the cylinder body through a support screw, the front flange of the connecting rod is connected to the impact cylinder, and the middle flange is connected to the cylinder rod; during the liquid filling process, the cylinder is pushed forward, that is, pushed from the handle side to the outer shell side, and the claw 7 is locked inward along the route set by the guide groove, and the impact cylinder 3 is directly connected to the filling port of the gas cylinder. After the filling is completed, the cylinder moves backward, the impact cylinder 3 withdraws from the filling port of the onboard gas bottle, and the pulley of the claw 7 opens outward along the concave and convex route on the outer surface of the impact cylinder to remove the filling gun.

[0028] The sealing mechanism includes a striker 3, a valve core ejector pin 4, a valve core 5 and a connecting rod 6, as well as a sealing pad, a spring and a screw. A sealing pad is fixed between the valve core ejector pin and the valve core to strengthen the sealing. The valve core ejector pin 4 cooperates with the inner conical surface of the striker. When the liquid is added and the gun is withdrawn, it hits the inner conical surface of the striker to achieve sealing and prevent the medium from flowing out. When adding liquid, the cylinder pushes the striker forward, and the valve core ejector pin 4 contacts the valve core of the vehicle-mounted gas cylinder filling port, pushing the valve core 5 open. The reaction force pushes the valve core ejector pin backward, that is, moves to the handle side. At this time, the striker and the gas cylinder establish a medium flow channel.

[0029] The cylinder includes a cylinder body 8, a cylinder rod 11 and a cylinder head 12. The cylinder body 8 and the cylinder rod 11 are connected and cooperate with each other. The valve core 5 passes through the cylinder rod and cooperates with the cylinder rod. The end of the cylinder is provided with a cylinder head. The controller includes a controller body 9 and a controller valve core 13. The controller body 9 and the controller valve core 13 are connected. The controller button is installed at the end of the controller valve core. The controller adjusts the displacement of the cylinder rod by accessing compressed air. The controller valve core 13 is arranged on the side of the cylinder block. Air inlets are provided on both sides of the cylinder body 8. The control valve core cooperates with the controller to adjust the opening and closing of the air inlets.

[0030] The impact cylinder 3 is a hollow cylinder. A plurality of liquid inlet holes are provided at the front end of the impact cylinder 3. An inner conical surface is also provided inside the impact cylinder 3. The inner conical surface cooperates with the valve core thimble. The valve core thimble 4 is connected to the valve core 5. A spring is arranged at the rear side of the valve core.

[0031] Silica aerogel is coated on the surfaces of the connecting rod and the impact cylinder. The flow direction of the filled medium is from the connecting rod connected to the filling hose to the impact cylinder. These two components are the main external heat transfer points. By coating silica aerogel on the surfaces of these two components, through tests, it can isolate about 80% of the original heat transfer rate, making it very difficult for low temperature to transfer to other components. Superhydrophobic coatings are provided on the surfaces of the outer shell sleeve, the claw, the cylinder body, the cylinder rod and the cylinder head. By applying superhydrophobic coatings on the surfaces, when a small amount of low temperature transfers to the outer shell components through the silica aerogel coating, the water droplets generated by the surrounding condensed gas cannot adhere to the surface of the machine parts, so that they cannot freeze. The middle flange of the connecting rod is connected to the front flange of the cylinder rod. An air isolation chamber is formed between the connecting rod and the inner cavity of the cylinder rod. The connecting rod does not contact the inner cavity of the cylinder rod, generating an air isolation system. Under the combined action of the silica aerogel coating, the superhydrophobic coating and the air barrier, the liquid filling gun cannot freeze. By comprehensively using the multi-point spraying liquid filling technology, the inner cavity silica aerogel coating technology, the outer shell superhydrophobic coating technology and the air barrier technology, the problems of low filling efficiency and easy icing can be solved. Each component is processed and combined with each other and interacts, so that under the action of cost reduction, the overall filling efficiency and anti-icing effect can be guaranteed, providing an LNG liquid filling gun with anti-icing, high efficiency, high safety performance and capable of continuously working safely and stably.

[0032] A handle holder 10 is also provided on the side of the cylinder head 12. The handle 15 is fixed on the handle holder. The operator operates the liquid filling gun through the handle. A connecting thread is provided at the end of the connecting rod 6. The connecting rod 6 is connected to the LNG gas source pipeline, and the medium is filled from the LNG gas source storage station to the vehicle-mounted gas cylinder through the medium circulation channel.

[0033] An LNG pneumatic liquid filling method uses the above anti-icing active protection type LNG pneumatic liquid filling gun. The liquid filling process includes: connecting the liquid filling gun and the gas cylinder filling port. Due to their corresponding model relationships, the muzzle and the filling port can be directly docked. Pull the controller button, which drives the controller valve core to move within the controller body, thereby controlling the compressed air to be injected into the bottom of the cylinder through the controller valve core. The cylinder rod is forced to move forward, and the cylinder rod pushes the connecting rod and the impact cylinder forward. The claw slides along the outer surface of the impact cylinder and then locks inward to ensure the safe docking of the interface during the filling process. The impact cylinder continues to move forward until the valve core thimble contacts the filling port valve core. When the filling port valve core is opened, it will push the valve core thimble backward under the action of the reaction force, establishing a medium flow channel for the filling operation. At the connection between the liquid filling channel of the liquid filling gun and the gas cylinder filling port, the impact cylinder is a hollow cylinder, and liquid is injected in a point spray manner through the front-end pores of the impact cylinder, improving the filling efficiency after the filling is completed.

[0034] After the filling operation is completed, the operation process includes: pushing the controller button, and the controller valve core moves accordingly within the controller body, controlling the compressed air to be reversed and injected into the cylinder through the control valve core. The cylinder rod is forced to move backward, that is, it moves toward the handle side. The connecting rod and the impact cylinder move backward at the same time. At this time, the filling port is closed, and at the same time, under the action of the spring, the valve core thimble moves forward. The valve core thimble cooperates with the inner conical surface of the impact cylinder to complete the sealing. The moving path of the pulley on the claw changes, the claw opens, and the liquid filling gun is disassembled.

[0035] During the liquid filling process, the cylinder moves forward, and the claw pulley locks inward along the concave-convex guiding groove on the outer surface of the impact cylinder, and the impact cylinder accesses the filling port; after the filling operation is completed, the cylinder moves backward, the impact cylinder leaves the gas cylinder filling port, and the claw pulley opens outward along the concave-convex guiding groove on the outer surface of the impact cylinder, and the liquid filling gun is removed.

[0036] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions, or substitutions made by those skilled in the art within the scope of the essence of the present invention should also fall within the protection scope of the present invention.

Claims

1. An anti-icing active protection type LNG pneumatic liquid filling gun, characterized in that, It includes a locking mechanism, a sealing mechanism, a cylinder and a controller. The locking mechanism includes a housing sleeve, a support screw, a connecting rod and a claw. A pulley is configured on the claw. The claw is installed on the housing sleeve through a pin and a snap ring. The housing sleeve is installed on the cylinder body through the support screw. The sealing mechanism includes a collision cylinder, a valve core thimble, a valve core and a connecting rod. A sealing gasket is fixed between the valve core thimble and the valve core. The valve core thimble is matched with the inner conical surface of the collision cylinder. The cylinder includes a cylinder body, a cylinder rod and a cylinder head. The cylinder body is connected to the cylinder rod, and a cylinder head is arranged at the end of the cylinder. The controller includes a controller body and a controller valve core. The controller body is connected to the controller valve core, and a controller button is installed at the end of the controller valve core. The controller adjusts the displacement of the cylinder rod by accessing compressed air. The collision cylinder is a hollow cylinder. A plurality of liquid inlet holes are arranged at the front end of the collision cylinder, and an inner conical surface is also arranged inside the collision cylinder. Silica aerogel is coated on the surfaces of the connecting rod and the collision cylinder. Superhydrophobic coatings are provided on the surfaces of the housing sleeve, the claw, the cylinder body, the cylinder rod and the cylinder head. The middle flange of the connecting rod is connected to the front flange of the cylinder rod, and an air isolation chamber is formed between the connecting rod and the inner cavity of the cylinder rod.

2. The active anti-icing LNG pneumatic filling gun according to claim 1, wherein A handle holder is also arranged on the side surface of the cylinder head, and a handle is fixed on the handle holder.

3. The active anti-icing LNG pneumatic filling gun according to claim 1, wherein, A connecting thread is arranged at the end of the connecting rod, and the connecting rod is connected to the LNG gas source pipeline.

4. A method for pneumatically filling LNG, which uses an anti-icing active protection type LNG pneumatic filling gun according to any one of claims 1 to 3, characterized in that, The liquid filling process includes: Connect the liquid filling gun and the gas cylinder filling port, pull the controller button. Compressed air is injected into the bottom of the cylinder through the controller valve core. The cylinder rod moves forward under force. The cylinder rod pushes the connecting rod and the collision cylinder forward. The claw slides along the outer surface of the collision cylinder and then locks inward. The collision cylinder continues to move forward until the valve core thimble contacts the filling port valve core. Opening the filling port valve core will also push the valve core thimble backward, establishing a medium flow channel for liquid filling operation.

5. A method for pneumatically filling LNG according to claim 4, characterized in that, After the liquid filling operation is completed, the operation process includes: Push the controller button. Compressed air is injected into the top of the cylinder through the control valve core. The cylinder rod moves backward under force. The connecting rod and the collision cylinder move backward simultaneously, closing the filling port. At the same time, under the action of the spring, the valve core thimble moves forward. The valve core thimble is matched with the inner conical surface of the collision cylinder to complete the seal. The moving path of the pulley on the claw changes, the claw opens, and the liquid filling gun is disassembled.

6. The LNG pneumatic liquid filling method according to claim 5, characterized in that, During the liquid filling process, the cylinder pushes forward. The claw pulley locks inward along the concave-convex guide groove on the outer surface of the collision cylinder, and the collision cylinder accesses the filling port. After the liquid filling operation is completed, the cylinder moves backward. The collision cylinder leaves the gas cylinder filling port. The claw pulley opens outward along the concave-convex guide groove on the outer surface of the collision cylinder, and the liquid filling gun is removed.

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