Liquefied natural gas (LNG) loading and unloading truck arm with leakage detection function
By designing a leak detection system on the LNG loading and unloading arm and automatically stopping loading and unloading using pressure sensors and controllers, the problem of LNG gas leakage in the prior art cannot be automatically stopped, and the safety of the loading and unloading process is improved.
Patent Information
- Application Number
- CN202421587430.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-06
- Publication Date
- 2025-05-06
- Estimated Expiration
- 2034-07-06
AI Technical Summary
Some existing LNG loading and unloading truck arms lack LNG gas leakage detection mechanisms, and cannot automatically stop loading and unloading when LNG gas is accidentally leaked.
A leak detection LNG loading and unloading arm is designed, using protective shells, bottom plates, liquid connecting pipes, gas connecting pipes, pressure sensors and switch valves. The air pressure changes in the pipeline are detected through the pressure sensor. If leakage is detected, the external controller can immediately close the electronic control valve, stop loading and unloading, and issue an alarm.
It realizes automatic stopping of loading and unloading when LNG gas leaks, improves the safety of loading and unloading truck arms, and prevents dangers and economic losses caused by gas leaks.
Smart Images
Figure CN222836695U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of LNG equipment, in particular to an LNG loading and unloading vehicle arm for leakage detection. Background Art
[0002] 1. Liquefied natural gas (LNG) is a widely used high-quality energy source with the characteristics of high calorific value, high efficiency and low pollution. LNG stations are usually equipped with loading and unloading systems and corresponding facilities. The LNG loading and unloading systems can be used to load and unload LNG gas for LNG transport vehicles, so as to facilitate the flexible transportation of LNG gas.
[0003] The LNG loading and unloading arm is one of the main equipment of the LNG loading and unloading system. It can connect the LNG station and the LNG transport vehicle. Some existing LNG loading and unloading arms lack LNG gas leakage detection mechanism and cannot automatically stop loading and unloading when LNG gas leaks accidentally. Therefore, a LNG loading and unloading arm with leakage detection is proposed to solve the above problem. Utility Model Content
[0004] The utility model aims to provide an LNG loading and unloading vehicle arm with leakage detection, so as to solve the problem that some existing LNG loading and unloading vehicle arms lack LNG gas leakage detection mechanisms and cannot automatically stop loading and unloading when LNG gas leaks accidentally.
[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0006] A LNG loading and unloading vehicle arm for leak detection comprises a protective shell and a bottom plate, wherein the bottom of the protective shell is fixedly connected to the bottom plate, a liquid-connected pipe and a gas-connected pipe are fixedly connected in a fixed groove of the protective shell, the bottoms of the liquid-connected pipe and the gas-connected pipe are fixedly connected to the bottom plate, a first pressure sensor and a second pressure sensor are fixedly connected to the left groove position of the protective shell, a first switch valve and a second switch valve are fixedly connected to the left side of the protective shell, the right side of the first switch valve is fixedly connected to the liquid-connected pipe, the right side of the second switch valve is fixedly connected to the gas-connected pipe, a liquid-phase loading and unloading arm is fixedly connected to the left side of the first switch valve, a gas-phase loading and unloading arm is fixedly connected to the left side of the second switch valve, a first break valve is fixedly connected to the left end of the liquid-phase loading and unloading arm, a second break valve is fixedly connected to the left end of the gas-phase loading and unloading arm, the liquid-phase loading and unloading arm comprises a first delivery pipe, a first rotary joint and a second delivery pipe, and the left end of the first delivery pipe A first rotating joint is fixedly connected, a second conveying pipe is fixedly connected to the lower side of the first rotating joint, a first partition plate is fixedly connected in the internal hollow grooves of the first conveying pipe and the second conveying pipe, a first regulating valve is fixedly connected in the connecting groove at the top of the outer wall of the first conveying pipe and the second conveying pipe, a third pressure sensor is fixedly connected in the fixed groove at the bottom of the outer wall of the first conveying pipe and the second conveying pipe, the gas phase loading and unloading arm comprises a third conveying pipe, a second rotating joint and a fourth conveying pipe, the left end of the third conveying pipe is fixedly connected to the second rotating joint, the lower side of the second rotating joint is fixedly connected to the fourth conveying pipe, the third conveying pipe and the fourth conveying pipe are fixedly connected in the internal hollow grooves of the second conveying pipe and the fourth conveying pipe, a second regulating valve is fixedly connected in the connecting groove at the top of the outer wall of the third conveying pipe and the fourth conveying pipe, and a fourth pressure sensor is fixedly connected in the fixed groove at the bottom of the outer wall of the third conveying pipe and the fourth conveying pipe.
[0007] Preferably, the protective shell is a rectangular shell structure, a groove is provided on the left side of the protective shell, a vertical partition plate is provided inside the protective shell, and two fixing grooves are provided on the left side and bottom of the protective shell.
[0008] Preferably, the liquid-connected pipe and the gas-connected pipe are respectively located on the left and right sides of a partition plate of the protective shell, and the first pressure sensor and the second pressure sensor are symmetrically distributed up and down.
[0009] Preferably, the first conveying pipe, the second conveying pipe, the third conveying pipe and the fourth conveying pipe are all circular pipes, and the first conveying pipe, the second conveying pipe, the third conveying pipe and the fourth conveying pipe are all composed of an outer wall and an inner wall, the inner side of the outer wall of the first conveying pipe, the second conveying pipe, the third conveying pipe and the fourth conveying pipe are fixedly connected to the inner wall, and a hollow groove is provided between the outer wall and the inner wall of the first conveying pipe, the second conveying pipe, the third conveying pipe and the fourth conveying pipe.
[0010] Preferably, the top of the outer side walls of the first delivery pipe, the second delivery pipe, the third delivery pipe and the fourth delivery pipe are each provided with a plurality of connecting grooves, the bottom of the outer side walls of the first delivery pipe, the second delivery pipe, the third delivery pipe and the fourth delivery pipe are each provided with a plurality of fixing grooves, and there are multiple first partition plates, first regulating valves, third pressure sensors, second partition plates, second regulating valves and fourth pressure sensors, the first regulating valves are each located on the upper side of the third pressure sensor, and the second regulating valves are each located on the upper side of the fourth pressure sensor.
[0011] Compared with the prior art, the beneficial effects of the utility model are:
[0012] In the utility model, by setting the first pressure sensor, the second pressure sensor, the first delivery pipe, the second delivery pipe, the third pressure sensor, the third delivery pipe, the fourth delivery pipe and the fourth pressure sensor, the device can respectively measure the air pressure inside the protective shell and at various places of the liquid phase loading and unloading arm and the gas phase loading and unloading arm. When a natural gas leak occurs in the pipeline, the external controller can immediately close all the electric control valves, stop the loading and unloading of natural gas, and at the same time send out an alarm to remind the staff. The device has higher safety. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0014] Figure 2 This is a cross-sectional view of the protective shell structure of the utility model;
[0015] Figure 3 This is a cross-sectional view of the liquid phase arm structure of the utility model;
[0016] Figure 4 It is a cross-sectional view of the gas phase arm structure of the utility model.
[0017] In the figure: 1. protective shell; 2. bottom plate; 3. liquid-connected pipe; 4. gas-connected pipe; 5. first pressure sensor; 6. second pressure sensor; 7. first switch valve; 8. second switch valve; 9. liquid-phase loading and unloading arm; 901. first delivery pipe; 902. first rotary joint; 903. second delivery pipe; 904. first partition plate; 905. first regulating valve; 906. third pressure sensor; 10. gas-phase loading and unloading arm; 1001. third delivery pipe; 1002. second rotary joint; 1003. fourth delivery pipe; 1004. second partition plate; 1005. second regulating valve; 1006. fourth pressure sensor; 11. first break valve; 12. second break valve. DETAILED DESCRIPTION
[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0019] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.
[0020] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.
[0021] See also Figure 1-4 , the utility model provides a technical solution:
[0022] A LNG loading and unloading vehicle arm for leak detection comprises a protective shell 1 and a bottom plate 2, wherein the bottom of the protective shell 1 is fixedly connected to the bottom plate 2, a liquid-connected pipe 3 and a gas-connected pipe 4 are fixedly connected in a fixed groove of the protective shell 1, the bottoms of the liquid-connected pipe 3 and the gas-connected pipe 4 are fixedly connected to the bottom plate 2, a first pressure sensor 5 and a second pressure sensor 6 are fixedly connected to the groove position on the left side of the protective shell 1, a first switch valve 7 and a second switch valve 8 are fixedly connected to the left side of the protective shell 1, the right side of the first switch valve 7 is fixedly connected to the liquid-connected pipe 3, and the second switch valve 8 is fixedly connected to the bottom plate 2. The right side is fixedly connected to the gas-connecting pipe 4, the left side of the first switch valve 7 is fixedly connected to the liquid-phase loading and unloading arm 9, the left side of the second switch valve 8 is fixedly connected to the gas-phase loading and unloading arm 10, the left end of the liquid-phase loading and unloading arm 9 is fixedly connected to the first break valve 11, the left end of the gas-phase loading and unloading arm 10 is fixedly connected to the second break valve 12, the liquid-phase loading and unloading arm 9 includes a first conveying pipe 901, a first rotary joint 902 and a second conveying pipe 903, the left end of the first conveying pipe 901 is fixedly connected to the first rotary joint 902, and the lower side of the first rotary joint 902 is fixedly connected to The second delivery pipe 903, the first delivery pipe 901 and the second delivery pipe 903 are both fixedly connected with a first partition plate 904 in their inner hollow grooves, the first delivery pipe 901 and the second delivery pipe 903 are fixedly connected with a first regulating valve 905 in the connecting groove at the top of the outer wall of the first delivery pipe 901 and the second delivery pipe 903, and the first delivery pipe 901 and the second delivery pipe 903 are fixedly connected with a third pressure sensor 906 in the fixed groove at the bottom of the outer wall. The gas phase loading and unloading arm 10 includes a third delivery pipe 1001, a second rotary joint 1002 and a fourth delivery pipe 1003. The third delivery pipe 100 1 is fixedly connected to the left end thereof with a second rotary joint 1002, a fourth delivery pipe 1003 is fixedly connected to the lower side of the second rotary joint 1002, a second partition plate 1004 is fixedly connected to the inner hollow grooves of the third delivery pipe 1001 and the fourth delivery pipe 1003, a second regulating valve 1005 is fixedly connected to the connecting groove at the top of the outer side walls of the third delivery pipe 1001 and the fourth delivery pipe 1003, and a fourth pressure sensor 1006 is fixedly connected to the fixing groove at the bottom of the outer side walls of the third delivery pipe 1001 and the fourth delivery pipe 1003.
[0023] The protective shell 1 is a rectangular shell structure, a groove is provided on the left side of the protective shell 1, a vertical partition plate is provided inside the protective shell 1, and two fixing grooves are provided on the left and bottom of the protective shell 1. The protective shell 1 can fix the liquid-connected pipe 3 and the gas-connected pipe 4 inside to protect them; the liquid-connected pipe 3 and the gas-connected pipe 4 are respectively located on the left and right sides of the partition plate of the protective shell 1, and the first pressure sensor 5 and the second pressure sensor 6 are symmetrically distributed up and down, and can respectively detect the air pressure of the space where the liquid-connected pipe 3 and the gas-connected pipe 4 are located; the first delivery pipe 901, the second delivery pipe 903, the third delivery pipe 1001 and the fourth delivery pipe 1003 are all circular pipes, and the first delivery pipe 901, the second delivery pipe 903, the third delivery pipe 1001 and the fourth delivery pipe 1003 are all composed of an outer wall and an inner wall, and the inner side of the outer wall of the first delivery pipe 901, the second delivery pipe 903, the third delivery pipe 1001 and the fourth delivery pipe 1003 is fixedly connected with the inner wall, and the first delivery pipe 901, the second delivery pipe 903, Hollow grooves are provided between the outer wall and the inner wall of the third delivery pipe 1001 and the fourth delivery pipe 1003, so that liquefied natural gas can be collected when it leaks; multiple connecting grooves are provided on the top of the outer wall of the first delivery pipe 901, the second delivery pipe 903, the third delivery pipe 1001 and the fourth delivery pipe 1003, and multiple fixing grooves are provided on the bottom of the outer wall of the first delivery pipe 901, the second delivery pipe 903, the third delivery pipe 1001 and the fourth delivery pipe 1003. There are multiple first partition plates 904, first regulating valves 905, third pressure sensors 906, second partition plates 1004, second regulating valves 1005 and fourth pressure sensors 1006. The first regulating valves 905 are located on the upper side of the third pressure sensor 906, and the second regulating valves 1005 are located on the upper side of the fourth pressure sensor 1006. When a liquefied natural gas leak is detected, the first regulating valve 905 or the second regulating valve 1005 at the corresponding position can be opened, and the leaked liquefied natural gas can be collected by the natural gas collection equipment.
[0024] Working process: Turn on the power supply before use. The first pressure sensor 5, the second pressure sensor 6, the first switch valve 7, the second switch valve 8, the first rotary joint 902, the first regulating valve 905, the third pressure sensor 906, the second rotary joint 1002, the second regulating valve 1005, the fourth pressure sensor 1006, the first break valve 11 and the second break valve 12 of the device are all electrical instruments. The first pressure sensor 5, the second pressure sensor 6, the third pressure sensor 906 and the fourth pressure sensor 1006 are of the same model. The first switch valve 7, the second switch valve 8, the first regulating valve 905, the second regulating valve 1005, the first break valve 11 and the second breakaway valve 12 are both electrically controlled valves, the first rotary joint 902 and the second rotary joint 1002 are of the same model, and the first rotary joint 902 and the second rotary joint 1002 are both provided with a rotatable structure inside, all of which are existing components, and the device is equipped with an external controller, which can control the operating states of the first pressure sensor 5, the second pressure sensor 6, the first switch valve 7, the second switch valve 8, the first rotary joint 902, the first regulating valve 905, the third pressure sensor 906, the second rotary joint 1002, the second regulating valve 1005 and the fourth pressure sensor 1006, all of which are existing technologies;When using the device, first stop the LNG transport vehicle at the designated position, then adjust the first rotary joint 902 and the second rotary joint 1002 through the external controller to rotate the second delivery pipe 903 and the fourth delivery pipe 1003 to a suitable angle, connect the first break valve 11 and the second break valve 12 to the natural gas storage tank of the LNG transport vehicle, and control the first switch valve 7 and the second switch valve 8 to open through the external controller. At this time, the liquid-connected pipe 3 and the liquid-phase loading and unloading arm 9 are connected, and the gas-connected pipe 4 and the gas-phase loading and unloading arm 10 are connected, so that liquefied natural gas can be loaded and unloaded. Liquefied natural gas can be transported through the liquid-connected pipe 3 and the liquid-phase loading and unloading arm 9, and the protective gas of liquefied natural gas can be transported through the gas-connected pipe 4 and the gas-phase loading and unloading arm 10. The LNG transport When the transport truck is loaded with liquefied natural gas, most of the protective gas in the car box is discharged. When the LNG transport truck unloads liquefied natural gas, a large amount of protective gas is filled into the car box to balance the air pressure in the LNG transport truck. The protective shell 1 on the top of the bottom plate 2 is provided with two internal spaces that are not interconnected. The liquid-connecting pipe 3 and the gas-connecting pipe 4 are respectively located in the two spaces. A certain amount of liquefied natural gas protective gas is pre-filled in the two spaces of the protective shell 1 so that the air pressure inside the space is slightly greater than the air pressure of the external environment. The first pressure sensor 5 and the second pressure sensor 6 can respectively measure the air pressure in the two spaces. If the first pressure sensor 5 or the second pressure sensor 6 detects a sudden and rapid decrease in air pressure, it means that there is a leak in the protective shell 1 and the protective shell 1 needs to be replaced. If the first pressure sensor 5 or the second pressure sensor 6 detects a sudden and rapid decrease in air pressure, it means that there is a leak in the protective shell 1 and the protective shell 1 needs to be replaced. If the sensor 5 detects a sudden increase in air pressure, it means that the liquid-connected pipe 3 is leaking. If the second pressure sensor 6 detects a sudden increase in air pressure, it means that the air-connected pipe 4 is leaking. Using the same principle, the first partition plate 904 can be used to divide the internal hollow grooves of the first delivery pipe 901 and the second delivery pipe 903 into a plurality of mutually different spaces, and the second partition plate 1004 can be used to divide the internal hollow grooves of the third delivery pipe 1001 and the fourth delivery pipe 1003 into a plurality of mutually different spaces. A certain amount of liquefied natural gas protective gas is pre-filled into the spaces in the first delivery pipe 901, the second delivery pipe 903, the third delivery pipe 1001 and the fourth delivery pipe 1003 through the first regulating valve 905 and the second regulating valve 1005, so that the air pressure inside the space is The air pressure is slightly greater than the air pressure of the external environment. The air pressure is measured by the third pressure sensor 906 and the fourth pressure sensor 1006. If the third pressure sensor 906 and the fourth pressure sensor 1006 detect that the air pressure suddenly decreases rapidly, it means that there is a hole in the outer wall of the pipeline at the corresponding position and it needs to be replaced. If the third pressure sensor 906 and the fourth pressure sensor 1006 detect that the air pressure suddenly increases, it means that there is a natural gas leak in the inner wall of the pipeline at the corresponding position. The third pressure sensor 906 and the fourth pressure sensor 1006 can send a signal to the external controller in time, and the external controller can immediately close all the electric control valves, stop the loading and unloading of natural gas, and send an alarm to remind the staff. The device has higher safety. ;
[0025] The contents not described in detail in this specification belong to the prior art known to the professional and technical personnel in this field. The standard parts used in this utility model can be purchased from the market, and the special-shaped parts can be customized according to the description and the drawings. The specific connection methods of each part adopt the conventional means such as bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt the conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.
[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A LNG loading and unloading vehicle arm for leak detection, comprising a protective shell (1) and a bottom plate (2), characterized in that: The bottom of the protective shell (1) is fixedly connected to a bottom plate (2); a liquid-connected pipe (3) and a gas-connected pipe (4) are fixedly connected in a fixed groove of the protective shell (1); the bottoms of the liquid-connected pipe (3) and the gas-connected pipe (4) are fixedly connected to the bottom plate (2); a first pressure sensor (5) and a second pressure sensor (6) are fixedly connected to a groove position on the left side of the protective shell (1); a first switch valve (7) and a second switch valve (8) are fixedly connected to the left side of the protective shell (1); the right side of the first switch valve (7) is fixedly connected to the liquid-connected pipe (3); the right side of the second switch valve (8) is fixedly connected to the gas-connected pipe (4). The first switch valve (7) is fixedly connected to a liquid-phase loading and unloading arm (9) on the left side, the second switch valve (8) is fixedly connected to a gas-phase loading and unloading arm (10) on the left side, the left end of the liquid-phase loading and unloading arm (9) is fixedly connected to a first breakaway valve (11), the left end of the gas-phase loading and unloading arm (10) is fixedly connected to a second breakaway valve (12), the liquid-phase loading and unloading arm (9) comprises a first conveying pipe (901), a first rotating joint (902) and a second conveying pipe (903), the left end of the first conveying pipe (901) is fixedly connected to the first rotating joint (902), the lower side of the first rotating joint (902) is fixedly connected to the second The first delivery pipe (903) is a first delivery pipe (901) and a second delivery pipe (903). The first partition plate (904) is fixedly connected to the inner hollow groove of each of the first delivery pipe (901) and the second delivery pipe (903). The first regulating valve (905) is fixedly connected to the connecting groove at the top of the outer wall of the first delivery pipe (901) and the second delivery pipe (903). The third pressure sensor (906) is fixedly connected to the fixing groove at the bottom of the outer wall of the first delivery pipe (901) and the second delivery pipe (903). The gas phase loading and unloading arm (10) includes a third delivery pipe (1001), a second rotary joint (1002) and a fourth delivery pipe (1003). The third delivery pipe (1001) is a first delivery pipe (1002). 001) is fixedly connected to a second rotating joint (1002) at its left end, a fourth delivery pipe (1003) is fixedly connected to the lower side of the second rotating joint (1002), a second partition plate (1004) is fixedly connected to the inner hollow grooves of the third delivery pipe (1001) and the fourth delivery pipe (1003), a second regulating valve (1005) is fixedly connected to the connecting groove at the top of the outer wall of the third delivery pipe (1001) and the fourth delivery pipe (1003), and a fourth pressure sensor (1006) is fixedly connected to the fixed groove at the bottom of the outer wall of the third delivery pipe (1001) and the fourth delivery pipe (1003).
2. The LNG loading and unloading vehicle arm for leak detection according to claim 1, characterized in that: The protective shell (1) is a rectangular shell structure, a groove is provided on the left side of the protective shell (1), a vertical partition plate is provided inside the protective shell (1), and two fixing grooves are provided on the left side and the bottom of the protective shell (1).
3. The LNG loading and unloading vehicle arm for leak detection according to claim 1, characterized in that: The liquid-connecting pipe (3) and the gas-connecting pipe (4) are respectively located on the left and right sides of the partition plate of the protective shell (1), and the first pressure sensor (5) and the second pressure sensor (6) are symmetrically distributed up and down.
4. The LNG loading and unloading vehicle arm for leak detection according to claim 1, characterized in that: The first conveying tube (901), the second conveying tube (903), the third conveying tube (1001) and the fourth conveying tube (1003) are all circular tubes. The first conveying tube (901), the second conveying tube (903), the third conveying tube (1001) and the fourth conveying tube (1003) are all composed of an outer wall and an inner wall. The inner side of the outer wall of the first conveying tube (901), the second conveying tube (903), the third conveying tube (1001) and the fourth conveying tube (1003) is fixedly connected to the inner wall. A hollow groove is provided between the outer wall and the inner wall of the first conveying tube (901), the second conveying tube (903), the third conveying tube (1001) and the fourth conveying tube (1003).
5. The LNG loading and unloading vehicle arm for leak detection according to claim 1, characterized in that: The top of the outer wall of the first delivery pipe (901), the second delivery pipe (903), the third delivery pipe (1001) and the fourth delivery pipe (1003) are each provided with a plurality of connecting grooves, and the bottom of the outer wall of the first delivery pipe (901), the second delivery pipe (903), the third delivery pipe (1001) and the fourth delivery pipe (1003) are each provided with a plurality of fixing grooves, and there are a plurality of the first partition plate (904), the first regulating valve (905), the third pressure sensor (906), the second partition plate (1004), the second regulating valve (1005) and the fourth pressure sensor (1006), and the first regulating valve (905) is each located on the upper side of the third pressure sensor (906), and the second regulating valve (1005) is each located on the upper side of the fourth pressure sensor (1006).