A double-gun liquid filling machine

Abstract

The present invention discloses a double-gun liquid adding machine, including a first filling pipeline, a second filling pipeline, and a liquid inlet, wherein the liquid inlet is connected to the first filling pipeline and the second filling pipeline through a three-way connecting pipe, and the outlet end of the three-way connecting pipe is connected to a small circulation pipeline, and a small circulation control valve is arranged on the small circulation pipeline, and the small circulation control valve is connected to the return gas liquid port through a pipeline. The device adopts a pneumatic valve control mode with a single small circulation function, so that the double-gun liquid addition does not interfere with each other, and realizes a reasonable filling logic and control mode; makes the liquid adding machine safer and more reliable; the device adopts a double-gun liquid adding machine with a single small circulation function, which releases space for one more pneumatic valve and installation pipeline, making the entire vacuum box and the control PID pipeline layout more concise.

Description

Technical Field

[0001] The invention relates to the field of LNG filling, in particular to a double-gun liquid filling machine. Background Art

[0002] LNG is the abbreviation of liquefied natural gas. Its main component is methane. It is recognized as the cleanest fossil energy on earth. It is colorless, odorless, non-toxic and non-corrosive. Its volume is about 1 / 625 of the volume of the same amount of gaseous natural gas, and the mass of liquefied natural gas is only about 45% of the same volume of water. Its manufacturing process is to purify the natural gas produced by the gas field first, and then transport it by liquefied natural gas ship after a series of ultra-low temperature liquefaction. After the combustion of liquefied natural gas, it pollutes the air very little and releases a lot of heat, so liquefied natural gas is a relatively advanced energy source. Liquefied natural gas is natural gas that has been compressed and cooled to its freezing point (-161.5℃) and becomes liquid. Usually, liquefied natural gas is stored in a low-temperature storage tank at -161.5 degrees Celsius and about 0.1MPa. Its main component is methane, which is transported by special ships or tank trucks and re-gasified when used.

[0003] In the current application of LNG filling stations, almost all double-gun liquid filling machine modules use two sets of vacuum boxes (modules) with two systems to control two sets of small circulation functions and the method of controlling PID; the main disadvantages of the double-gun liquid filling machine with two sets of small circulation functions in the gas filling operation project are manifested in the following aspects:

[0004] 1) When one of the two-gun liquid-adding machines is adding liquid, if the other liquid-adding machine needs to be started, it must first start to enter the small circulation mode, and then enter the liquid-adding mode; when entering the small circulation mode, the liquid-adding machine will have serious flow deviation, resulting in too small flow when one of the guns is adding liquid, and the filling time becomes longer, which greatly increases the time cost;

[0005] 2) The double-gun liquid adding machine with two sets of small circulation functions, the vacuum box and the control PID are relatively complex, there is no safe and effective maintenance space, and there are certain safety risks. Summary of the invention

[0006] The purpose of the invention is to provide a double-gun liquid adding machine in view of the above-mentioned problems. The vacuum module of this special structure adopts a small circulation pneumatic valve to control the circulation function of the double-gun liquid adding machine, which solves the problem that the small circulation functions of the two systems of the double-gun liquid adding machine do not need to be performed separately, greatly saves the startup time of the liquid adding machine, and also saves the user's usage time cost and production material cost.

[0007] The technical solution adopted by the present invention is as follows:

[0008] A double-gun liquid filling machine comprises a first filling pipeline, a second filling pipeline and a liquid inlet, wherein the liquid inlet is connected to the first filling pipeline and the second filling pipeline through a three-way connecting pipe, the outlet end of the three-way connecting pipe is connected to a small circulation pipeline, a small circulation control valve is arranged on the small circulation pipeline, and the small circulation control valve is connected to a return gas liquid port through a pipeline.

[0009] Furthermore, the present invention discloses a preferred structure of a double-gun liquid charging machine, wherein the connecting pipeline between the small circulation control valve and the three-way connecting pipe is a curved pipeline.

[0010] Furthermore, the two output ends of the three-way connecting pipe are respectively connected to a first liquid outlet and a second liquid outlet, the first liquid outlet and the second liquid outlet are both connected to a liquid flow meter, and the output ends of the two liquid flow meters are respectively connected to a first liquid return port and a second liquid return port.

[0011] Furthermore, the output end of the first liquid return port is connected to a liquid adding control valve, and the output end of the second liquid return port is connected to a liquid adding control valve, and the liquid adding control valve is a pneumatic valve.

[0012] Furthermore, the output ends of the two liquid adding control valves are respectively connected to a first liquid adding port and a second liquid adding port through pipelines, the first liquid adding port and the second liquid adding port are both connected to a filling gun nozzle, and the filling gun nozzles are both connected to a filling gun.

[0013] Furthermore, the first filling pipeline and the second filling pipeline both include an air return channel and a gun insertion pipeline, the gun insertion pipeline includes a gun insertion port, the gun insertion port is connected to a one-way valve through a pipeline, and the two one-way valves are respectively connected to the first air return port and the second air return port through pipelines; the first air return port and the second air return port are both connected to a stop valve, and the stop valve is connected to the air return liquid port through a pipeline.

[0014] Furthermore, the return air channel includes a return air gun nozzle, the return air gun nozzle is connected to a one-way valve through a pipeline, the output end of the one-way valve is connected to a gas flow meter, and the output end of the gas flow meter is connected to the first return air port and the second return air port through a pipeline.

[0015] Furthermore, a plurality of needle valves are arranged on the pipeline system, the needle valves are connected to safety valves, and the safety valves are connected to the relief ports through pipelines.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0017] 1. This device utilizes the unique small cycle function precooling mode. Two sets of pipelines are set adjacent to each other. At the same time, the two flow meters are fully precooled to ensure that both guns of the liquid adding machine play the precooling mode, ensure the normal operation of the flow meter, and the liquid adding machine starts the double guns with high liquid adding efficiency.

[0018] 2. This device adopts a pneumatic valve control mode with a unique small circulation function, which can realize double-gun liquid filling without interference, and realize reasonable filling logic and control mode; making the liquid filling machine safer and more reliable.

[0019] 3. This device can discharge liquid directly into the EAG gasifier from the bottom, which improves the exhaust efficiency and saves the time and cost of submersible pump maintenance.

[0020] 4. This device adopts a double-gun liquid adding machine with a single small circulation function, which frees up space for an extra pneumatic valve and installation pipeline, making the layout of the entire vacuum box and control PID pipeline more concise. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0023] Figure 3 It is a schematic diagram of pipeline connection of the present invention;

[0024] Markings in the figure: 1 is the liquid inlet; 2 is the first liquid adding port; 3 is the first air return port; 4 is the first liquid return port; 5 is the first liquid outlet; 6 is a one-way valve; 7 is a pneumatic valve; 8 is a three-way connecting pipe; 9 is the second liquid adding port; 10 is the second air return port; 11 is the second liquid return port; 12 is the second liquid outlet; 13 is the air return liquid port; 14 is the small circulation control valve. DETAILED DESCRIPTION

[0025] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0026] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] Embodiment 1:

[0028] As attached Figure 1-Figure 3 As shown, the present invention discloses a preferred embodiment of a double-gun liquid charging machine, including a liquid inlet 1, the liquid inlet 1 is connected to a three-way connecting pipe 8, a first output end of the three-way connecting pipe 8 is connected to a first filling pipeline, a second output end of the three-way connecting pipe 8 is connected to a second filling pipeline and a small circulation pipeline through a bifurcated pipe, a small circulation control valve 14 is arranged on the small circulation pipeline, and the small circulation control valve 14 is connected to a return gas liquid port 13 through a pipeline.

[0029] The connecting pipe between the small circulation control valve 14 and the three-way connecting pipe 8 is a curved pipe. The first filling pipeline and the second filling pipeline have the same structure.

[0030] The two output ends of the three-way connecting pipe 8 are respectively connected to the first liquid outlet 5 and the second liquid outlet 12, and the first liquid outlet 5 and the second liquid outlet 12 are both connected to a liquid phase flowmeter, and the output ends of the two liquid phase flowmeters are respectively connected to the first liquid return port 4 and the second liquid return port 11. The output end of the first liquid return port 4 is connected to a liquid addition control valve, and the output end of the second liquid return port 11 is connected to a liquid addition control valve, and the liquid addition control valve is a pneumatic valve 7. The output ends of the two liquid addition control valves are respectively connected to the first liquid addition port 2 and the second liquid addition port 9 through pipelines, and the first liquid addition port 2 and the second liquid addition port 9 are both connected to a filling gun nozzle, and the filling gun nozzle is connected to a filling gun.

[0031] The first filling pipeline and the second filling pipeline both include a return air channel and a gun insertion pipeline, the gun insertion pipeline includes a gun insertion port, the gun insertion port is connected to a one-way valve through a pipeline, and the two one-way valves are respectively connected to the first return air port 3 and the second return air port 10 through pipelines; the first return air port 3 and the second return air port 10 are both connected to a stop valve, and the stop valve is connected to the return air liquid port 13 through a pipeline. The return air channel includes a return air gun port, the return air gun port is connected to a one-way valve through a pipeline, the output end of the one-way valve is connected to a gas phase flow meter, and the output end of the gas phase flow meter is connected to the first return air port 3 and the second return air port 10 through a pipeline.

[0032] The pipeline system is provided with a plurality of needle valves, and the needle valves are connected to safety valves, and the safety valves are connected to the relief port through pipelines; when the pressure is too high, the pressure is relieved to protect the safety of the equipment.

[0033] In the specific operation process, the equipment needs to be pre-cooled before filling. The filling gun is inserted into the gun insertion port, the filling control valve is opened, and the liquid hydrogen flows into the pipeline system. Due to the high temperature of the pipeline system, the liquid hydrogen will be partially vaporized, and the entire equipment will be cooled during the vaporization process. The liquid hydrogen enters from the liquid inlet 1 and flows into the first filling pipeline and the second filling pipeline from the three-way connecting pipe 8 respectively.

[0034] Liquid hydrogen flows through the liquid phase flow meter and the liquid filling control valve to the filling gun, flows back to the gun port through the filling gun, and then reaches the gas return port through the one-way valve and the stop valve. After a certain period of circulation, the temperature of the entire filling equipment reaches the operating temperature.

[0035] During filling, the filling gun is inserted into the target, the return air port of the target is connected to the return air gun nozzle, and filling is performed. At the same time, the gas generated by the target passes through the return air gun nozzle, the one-way valve, the gas flow meter, and the stop valve and returns to the return air liquid port 13.

[0036] When the equipment has been pre-cooled but has not been used for a period of time, the temperature of the equipment has risen, but only a small circulation is needed to pre-cool the equipment to reach the operating temperature. At this time, close the liquid addition control valve and open the small circulation control valve. Liquid hydrogen flows from the liquid inlet 1 through the three-way connecting pipe 8 and the small circulation control valve 14 into the return gas liquid port 13. Since the connecting pipeline between the small circulation control valve 14 and the three-way connecting pipe 8 is a curved pipeline, liquid hydrogen will generate resistance when flowing, so that a pressure difference is formed between the three-way connecting pipe 8 and the small circulation control valve 14, and the liquid hydrogen will flow to the liquid phase flowmeter to cool the liquid phase flowmeter, thereby improving the measurement accuracy of the liquid phase flowmeter.

[0037] This device adopts a pneumatic valve control mode with only a small circulation function, which can achieve double-gun liquid filling without interference, and realize reasonable filling logic and control mode; making the liquid filling machine safer and more reliable; the device adopts a double-gun liquid filling machine with a single small circulation function, which frees up space for an extra pneumatic valve and installation pipeline, making the entire vacuum box and control PID pipeline layout more concise.

[0038] 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 and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A double-gun liquid filling machine, Features: The invention comprises a first filling pipeline and a second filling pipeline, and comprises a liquid inlet (1), wherein the liquid inlet (1) is connected to the first filling pipeline and the second filling pipeline via a three-way connecting pipe (8), a first output end of the three-way connecting pipe (8) is connected to the first filling pipeline, a second output end of the three-way connecting pipe (8) is connected to the second filling pipeline and a small circulation pipeline via a bifurcated pipe, a small circulation control valve (14) is provided on the small circulation pipeline, and the small circulation control valve (14) is connected to a gas return liquid port (13) via a pipeline; The connecting pipe between the small circulation control valve (14) and the three-way connecting pipe (8) is a curved pipe; The two output ends of the three-way connecting pipe (8) are respectively connected to a first liquid outlet (5) and a second liquid outlet (12); the first liquid outlet (5) and the second liquid outlet (12) are both connected to a liquid phase flow meter; and the output ends of the two liquid phase flow meters are respectively connected to a first liquid return port (4) and a second liquid return port (11); The output end of the first liquid return port (4) is connected to a liquid addition control valve, and the output end of the second liquid return port (11) is connected to a liquid addition control valve.

2. A double-gun liquid filling machine as claimed in claim 1, Features: The liquid adding control valve is a pneumatic valve (7).

3. A double-gun liquid filling machine as claimed in claim 2, Features: The output ends of the two liquid filling control valves are respectively connected to a first liquid filling port (2) and a second liquid filling port (9) through pipelines; the first liquid filling port (2) and the second liquid filling port (9) are both connected to a filling gun nozzle; and the filling gun nozzles are both connected to a filling gun.

4. A double-gun liquid filling machine as claimed in claim 3, Features: The first filling pipeline and the second filling pipeline both comprise an air return channel and a gun insertion pipeline, the gun insertion pipeline comprises a gun insertion port, the gun insertion port is connected to a one-way valve via a pipeline, the two one-way valves are respectively connected to a first air return port (3) and a second air return port (10) via pipelines; the first air return port (3) and the second air return port (10) are both connected to a stop valve, and the stop valve is connected to a return air liquid port (13) via a pipeline.

5. A double-gun liquid filling machine as claimed in claim 4, Features: The air return channel comprises an air return nozzle, the air return nozzle is connected to a one-way valve via a pipeline, the output end of the one-way valve is connected to a gas flow meter, and the output end of the gas flow meter is connected to a first air return port (3) and a second air return port (10) via a pipeline.

6. A double-gun liquid filling machine as claimed in claim 5, Features: A plurality of needle valves are arranged on the pipeline system, and the needle valves are connected to safety valves, and the safety valves are connected to the relief ports through pipelines.

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