Device for filling low-temperature liquid

Abstract

The device for filling the low-temperature liquid solves the problem that residual liquid nitrogen exists in a pipeline and comprises a filling assembly and a cleaning assembly, the filling assembly comprises a liquid outlet pipe, a filter, a liquid pump and a motor, the liquid inlet end of the liquid outlet pipe is used for being communicated with a liquid source, the liquid outlet end of the liquid outlet pipe is communicated with the interior of a tank car, and the liquid inlet end of the liquid outlet pipe is communicated with the interior of the tank car. The filter and the liquid pump are arranged on the liquid outlet pipe, the gas inlet end of the first gas filling pipe is externally connected with a gas source, after filling is finished, liquid nitrogen still remains in a pipeline, extra power is needed to enable the residual liquid nitrogen to enter the tank car, at the moment, a gas blowing pipe needs to be opened, the gas blowing pipe is externally connected with a nitrogen source, and the gas blowing pipe blows nitrogen into the pipeline, so that the gas filling process is completed. In this way, the pressure in the pipeline is increased, residual liquid nitrogen in the pipeline flows to the tank car, no residual liquid nitrogen exists in the pipeline, and therefore the problem that the residual liquid nitrogen exists in the pipeline is solved.

Description

Technical Field

[0001] This utility model relates to the field of cryogenic liquid collection, and in particular to a device for filling cryogenic liquids. Background Technology

[0002] The backup system for oxygen production in the air separation unit of the energy power plant did not consider cryogenic liquid filling in the initial design, which makes it inconvenient for the turnover of cryogenic liquid within the plant area and prevents the cryogenic liquid from being fully utilized, resulting in increased production costs for the enterprise.

[0003] In particular, during the filling and collection of liquid nitrogen, the temperature of liquid nitrogen is extremely low, which places high demands on the quality of the pipeline. The pipeline must be able to withstand low temperatures. In addition, after the liquid nitrogen filling and collection is completed, liquid nitrogen will remain in the pipeline, and may even freeze. If liquid nitrogen is to be filled and collected again next time, the residue in the pipeline will hinder the delivery of new liquid nitrogen. Utility Model Content

[0004] The purpose of this invention is to provide a device for filling cryogenic liquids, which solves the problem of residual liquid nitrogen in pipelines.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] This utility model provides a device for filling cryogenic liquids, including a filling component, a cleaning component, and the filling component includes a liquid outlet pipe, a filter, a liquid pump, and a motor. The liquid inlet end of the liquid outlet pipe is used to connect to a liquid source, and the liquid outlet end of the liquid outlet pipe is connected to the tank truck. The filter and the liquid pump are installed on the liquid outlet pipe, and the rotating end of the liquid pump is connected to the drive end of the motor.

[0007] The cleaning assembly includes a backflush pipe, a regulating valve, a first gas filling pipe, and a first check valve. The backflush pipe and the first nitrogen pipe are connected to the liquid outlet pipe. The regulating valve is installed on the backflush pipe, and the first check valve is installed on the first gas filling pipe. The gas inlet of the first gas filling pipe is connected to an external gas source.

[0008] Optionally, the filling assembly further includes a second check valve, and the liquid outlet pipe includes a first liquid pipe, a second liquid pipe and a third liquid pipe. The first liquid pipe is connected to the filter and the liquid source at both ends, the second liquid pipe is connected to the filter and the second check valve at both ends, and the third liquid pipe is connected to the second check valve and the tank truck at both ends. The filter is installed on the second liquid pipe.

[0009] Furthermore, the filling assembly also includes a first hose and a second hose, the two ends of the first hose being connected to the inlet end of the liquid pump and the first liquid pipe, respectively, and the two ends of the second hose being connected to the outlet end of the liquid pump and the second liquid pipe, respectively.

[0010] Furthermore, the filling assembly also includes an equal-diameter three-way valve, a bypass pipe, and a first liquid inlet valve. The equal-diameter three-way valve is disposed on the first liquid pipe. The two ends of the bypass pipe are respectively connected to the equal-diameter three-way valve and the tank truck. A second liquid inlet valve is disposed on the bypass pipe. The first liquid inlet valve is disposed on the first liquid pipe and is disposed between the equal-diameter three-way valve and the filter.

[0011] Furthermore, the filling assembly also includes a cleaning pipe and a cleaning valve. The cleaning pipe is connected to the bypass pipe and is disposed between the equal-diameter three-way valve and the second inlet valve. The cleaning valve is disposed on the cleaning pipe.

[0012] Furthermore, the filling assembly also includes a main inlet pipe and a main inlet valve. The outlet ends of the bypass pipe and the third liquid pipe are connected to the inlet end of the main inlet pipe. The outlet end of the main inlet pipe is connected to the tank truck. The main inlet valve is installed on the main inlet pipe.

[0013] Furthermore, the cleaning assembly also includes a first vent pipe, a second vent pipe, a first vent valve, and a second vent valve. The first vent pipe is connected to the first liquid pipe and is disposed between the first liquid inlet valve and the filter. The second vent pipe is connected to the second liquid pipe. The second vent valve is disposed on the second vent pipe. A first flow valve is disposed between the second vent pipe and the second check valve.

[0014] Furthermore, the cleaning assembly also includes a first drain pipe, a second drain pipe, a third drain pipe, a first drain valve, a second drain valve, and a third drain valve. The first drain pipe is connected to the third drain pipe, the first drain valve is disposed on the first drain pipe, the second drain pipe is connected to the second vent pipe, the second drain valve is disposed on the second drain pipe, the third drain pipe is connected to the first vent pipe, and the third drain valve is disposed on the third drain pipe.

[0015] Furthermore, the cleaning assembly also includes a second gas filling pipe, a second gas filling valve, and a second flow valve. The second gas filling pipe is connected to the third drain pipe. The second gas filling valve is installed on the second gas filling pipe. The third drain pipe is also equipped with a second flow valve. The second flow valve is used to adjust the inlet end of the third drain pipe, and the third drain valve is used to adjust the outlet end of the third drain pipe.

[0016] Furthermore, the cleaning assembly also includes a pressure gauge, a return pipe, and a return valve. The pressure gauge is used to monitor the pressure in the second liquid pipe. The return pipe is connected to the second liquid pipe and is located between the liquid pump and the second exhaust pipe. The return valve is located on the return pipe.

[0017] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0018] This invention relates to a device for filling cryogenic liquids. After filling, liquid nitrogen remains in the pipeline, requiring additional power to transfer the residual liquid nitrogen into the tank truck. This is achieved by opening a blowing pipe connected to a nitrogen source and blowing nitrogen into the pipeline. This increases the pressure inside the pipeline, causing the residual liquid nitrogen to flow into the tank truck, thus eliminating the presence of residual liquid nitrogen in the pipeline and solving the problem of residual liquid nitrogen in the pipeline. Attached Figure Description

[0019] The following sections will describe some specific embodiments of the present invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0020] Figure 1 This is a connection diagram of a device for filling cryogenic liquids according to a preferred embodiment of the present invention;

[0021] Figure 2 yes Figure 1 Enlarged view of the gas filling pipe and related components shown;

[0022] Figure 3 yes Figure 1 The image shows a magnified view of the cleanup component's structure.

[0023] The reference numerals in the attached figures are explained as follows:

[0024] 1. Filling assembly; 2. Cleaning assembly; 3. Tank truck; 10. Cleaning valve; 11. Discharge pipe; 12. Filter; 13. Liquid pump; 14. Motor; 15. Equal diameter three-way valve; 16. Second check valve; 17. Bypass pipe; 18. Second inlet valve; 19. Cleaning pipe; 20. First flow valve; 21. Backflush pipe; 22. Regulating valve; 23. First gas filling pipe; 24. Second flow valve; 25. First check valve; 26. Second vent pipe; 27. First vent valve; 28. Second vent valve; 29. ​​First vent pipe; 101. Inlet pipe; 102. Main inlet valve; 111. First liquid pipe; 12. Second liquid pipe; 113. Third liquid pipe; 131. First hose; 132. Second hose; 200. Regulating valve; 201. First drain pipe; 202. Second drain pipe; 203. Third drain pipe; 204. Second gas supply pipe; 205. First drain valve; 206. Second drain valve; 207. Third drain valve; 208. Second gas supply valve; 217. Pressure gauge; 218. Return pipe; 219. Return valve; 221. First safety pipe; 231. First safety valve; 222. Second safety pipe; 232. Second safety valve; 223. Third safety pipe; 233. Third safety valve. Detailed Implementation

[0025] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0028] like Figure 1 and Figure 2 and Figure 3As shown, an apparatus for filling cryogenic liquids includes a filling component 1, a cleaning component 2, and a tank truck 3. The filling component 1 includes an outlet pipe 11, a filter 12, a liquid pump 13, and a motor 14. The inlet end of the outlet pipe 11 is used to connect to a liquid source, which in this example refers to liquid nitrogen at cryogenic conditions. The outlet end of the outlet pipe 11 is connected to the tank truck 3, which is used to collect liquid nitrogen.

[0029] The filter 12 and the liquid pump 13 are installed on the liquid outlet pipe 11. The rotating end of the liquid pump 13 is connected to the driving end of the motor 14. When the motor 14 is started, the motor 14 drives the liquid pump 13 to rotate. The liquid pump 13 draws liquid nitrogen, which flows through the liquid outlet pipe 11 and then through the filter 12 for filtration.

[0030] The cleaning component 2 includes a backflush pipe 21, a regulating valve 22, a first gas supply pipe 23, and a first check valve 25. The backflush pipe 21 and the first nitrogen pipe 23 are connected to the liquid outlet pipe 11. The regulating valve 22 is installed on the backflush pipe 21, and the first check valve 25 is installed on the first gas supply pipe 23. The gas inlet end of the first gas supply pipe 23 is connected to an external gas source.

[0031] After the liquid nitrogen filling in tank truck 3 is completed, the first liquid inlet valve 133 and the return valve 219 are closed. At the same time, the first gas filling pipe 23 adds room temperature nitrogen to the liquid outlet pipe 11. Since there is still residual liquid nitrogen in the liquid outlet pipe 11 at this time, the nitrogen is blown to make the residual liquid nitrogen flow into tank truck 3, thus reducing liquid nitrogen waste. After the residual liquid nitrogen is transported to the tank truck by the external room temperature nitrogen, the solenoid valve 209 on the second gas filling pipe is closed to cut off the external nitrogen. The quick connector between the tank truck and the filling pipeline is disconnected, and the tank truck leaves.

[0032] After the tanker truck leaves, open the first drain valve 205, the second drain valve 206, and the third drain valve 207 to drain the remaining liquid nitrogen in the pipeline. Once the residual liquid nitrogen in the first liquid pipe 111, the second liquid pipe 112, and the third liquid pipe 113 is cleaned, open the second gas filling valve 208 to reheat the pipeline and liquid pump, waiting for the next new tanker truck 3 to be filled with liquid nitrogen. Before filling, the third liquid pipe 113 sprays nitrogen gas in the reverse direction to the backflush pipe 21, and at the same time, the regulating valve 22 is opened to replace the air in the third liquid pipe 113 with nitrogen gas. The gas in the third liquid pipe 113 flows out from the backflush pipe 21. After the set time, close the regulating valve 22, and the tanker truck 3 will no longer spray nitrogen gas in the reverse direction. Then start the motor 14 to officially fill the liquid nitrogen.

[0033] The filling assembly 1 also includes a second check valve 16. The liquid outlet pipe 11 includes a first liquid pipe 111, a second liquid pipe 112 and a third liquid pipe 113. The first liquid pipe 111 is connected to the filter 12 and the liquid source at both ends, the second liquid pipe 112 is connected to the filter 12 and the second check valve 16 at both ends, and the third liquid pipe 113 is connected to the second check valve 16 and the tank truck 3 at both ends. The filter 12 is installed on the second liquid pipe 112.

[0034] The filling assembly 1 also includes a first hose 131 and a second hose 132. The first hose 131 is connected at both ends to the inlet of the liquid pump 13 and the outlet of the first liquid pipe 111, respectively. The second hose 132 is connected at both ends to the outlet of the liquid pump 13 and the second liquid pipe 112, respectively. Both the first hose 131 and the second hose 132 are elastic. Because the temperature of liquid nitrogen is very low, the temperature inside the first liquid pipe 111 and the second liquid pipe 112 is low when filling with nitrogen. After filling is completed, the first liquid pipe 111 and the second liquid pipe 112 need to return to normal temperature. Therefore, the first liquid pipe 111 and the second liquid pipe 112 will undergo thermal expansion and contraction. The first hose 131 can reduce the collision between the first liquid pipe 111 and the pump 13, and the second hose 132 can reduce the collision between the second liquid pipe 112 and the pump 13.

[0035] The filling assembly 1 also includes an equal-diameter three-way valve 15, a bypass pipe 17, and a first inlet valve 133. The equal-diameter three-way valve 15 is disposed on the first liquid pipe 111. The two ends of the bypass pipe 16 are respectively connected to the equal-diameter three-way valve 15 and the tank truck 3. The equal-diameter three-way valve 15 is disposed on the first liquid pipe 111. The two ends of the bypass pipe 17 are respectively connected to the equal-diameter three-way valve 15 and the tank truck 3. A second inlet valve 18 is disposed on the bypass pipe 17. The first inlet valve 133 is disposed on the first liquid pipe 111 and is disposed between the equal-diameter three-way valve 15 and the filter 12.

[0036] The bypass pipe 17 is equipped with a second inlet valve 18. When the outlet pipe 11 needs maintenance or cannot be used temporarily, the first inlet valve 133 is closed and the second inlet valve 18 is opened. The bypass pipe 17 is used as an emergency backup. Under normal circumstances, the second inlet valve 18 is not opened, but the bypass pipe 17 is activated. Liquid nitrogen is circulated through the bypass pipe 17 with the assistance of other equipment. When the outlet pipe 11 is normally circulated with liquid nitrogen, the second inlet valve 18 is in the closed state.

[0037] The filling assembly 1 also includes a cleaning pipe 19 and a cleaning valve 10. The cleaning pipe 19 is connected to the bypass pipe 17 and is located between the equal-diameter three-way valve 15 and the second liquid inlet valve 18. The cleaning valve 10 is located on the cleaning pipe 19. When cleaning is not required in the bypass pipe 17, the cleaning valve 10 is normally closed. When cleaning is required in the bypass pipe 17, the cleaning valve 10 is opened and room temperature nitrogen is introduced through the first liquid pipe 111. The room temperature nitrogen reaches the bypass pipe 17 through the equal-diameter three-way valve 15. The room temperature nitrogen undergoes heat exchange in the bypass pipe 17. There is residual liquid nitrogen in the bypass pipe 17. Under the action of the room temperature nitrogen, the residual liquid nitrogen is discharged through the cleaning pipe 19, so that the bypass pipe 17 is kept clean and at room temperature.

[0038] The filling assembly 1 also includes a main inlet pipe 101 and a main inlet valve 102. The outlet ends of the bypass pipe 17 and the third liquid pipe 113 are connected to the inlet end of the main inlet pipe 101. The outlet end of the main inlet pipe 101 is connected to the tank truck 3. The main inlet valve 102 is installed on the main inlet pipe 101.

[0039] The cleaning component 2 also includes a first exhaust pipe 29, a second exhaust pipe 26, a first exhaust valve 27, and a second exhaust valve 28. The first exhaust pipe 29 is connected to the first liquid pipe 111 and is located between the first liquid inlet valve 133 and the filter 12. The second exhaust pipe 26 is connected to the second liquid pipe 112 and the second exhaust valve 28 is located on the second exhaust pipe 26. A second flow valve 20 is located between the second exhaust pipe 26 and the second check valve 16. After the tank truck 3 finishes spraying nitrogen in the reverse direction, the motor 14 is turned on to drive the liquid pump 13, the first flow valve 20 is closed, and the first exhaust valve 27 and the second exhaust valve 28 are opened at the same time, so that liquid nitrogen flows from the first liquid pipe 111 to the second liquid pipe 112.

[0040] At this time, the first liquid pipe 111 and the second liquid pipe 112 are filled with air. The air is compressed by the liquid nitrogen and flows out from the first exhaust pipe 29 and the second exhaust pipe 26 respectively. When liquid nitrogen flows out from the first exhaust pipe 29 and the second exhaust pipe 26, it means that the air in the first liquid pipe 111 and the second liquid pipe 112 has been completely purged. Then, the first exhaust valve 27 and the second exhaust valve 28 are closed, and the first flow valve 20 is opened. At this time, the liquid nitrogen flows through the third liquid pipe 113 into the tank truck 3.

[0041] Cleaning component 2 also includes a first drain pipe 201, a second drain pipe 202, a third drain pipe 203, a first drain valve 205, a second drain valve 206, and a third drain valve 207. The first drain pipe 201 is connected to the third drain pipe 113. The first drain valve 205 is installed on the first drain pipe 201. The second drain pipe 202 is connected to the second vent pipe 26. The second drain valve 206 is installed on the second drain pipe 202. The third drain pipe 203 is connected to the first vent pipe 25. The third drain valve 207 is installed on the third drain pipe 203. After filling is completed, the second drain valve 206 and the third drain valve 207 are opened, and the first drain... The residual liquid nitrogen in pipe 111 flows out from the third drain pipe 203, and the residual liquid nitrogen in the second liquid pipe 112 flows out from the second drain pipe 202. The first gas filling pipe 23 is equipped with a first gas filling valve 209. When the first gas filling valve 209 is opened, nitrogen gas is injected into the third liquid pipe 113 through the first gas filling pipe 23. The nitrogen gas drives the residual liquid nitrogen to flow, so that the residual liquid nitrogen in the third liquid pipe 113 is refilled into the tank truck 3. When the set time is reached, the first gas filling valve 209 is closed, the tank truck 3 is driven away, and the first drain valve 205 is opened. The remaining residual liquid in the third liquid pipe 113 flows out from the first drain pipe 201 or from the liquid outlet end of the third liquid pipe 113.

[0042] The cleaning component 2 also includes a second gas filling pipe 204, a second gas filling valve 208, and a second flow valve 24. The second gas filling pipe 204 is connected to the third drain pipe 203. The second gas filling valve 208 is installed on the second gas filling pipe 204. The third drain pipe 203 is also equipped with a second flow valve 24. The second flow valve 24 is used to adjust the inlet end of the third drain pipe 203, and the third drain valve 207 is used to adjust the outlet end of the third drain pipe 203.

[0043] When the third drain pipe 203 is draining liquid, the second flow valve 24 and the third drain valve 207 should be opened, while the second gas filling valve 208 should be closed. When the third drain pipe 203 is draining liquid, the third drain valve 207 and the third exhaust valve 234 should be closed. After the liquid nitrogen is filled, the first gas filling pipe 23 completes the nitrogen filling. At this time, the second gas filling valve 208 is opened, and the second gas filling pipe 204 adds nitrogen to the first liquid pipe 111. The nitrogen flows to the second liquid pipe 112 and the third liquid pipe 113. Finally, the nitrogen flows out from the liquid outlet of the third liquid pipe 113. The nitrogen achieves heat exchange in the first liquid pipe 111, the second liquid pipe 112 and the third liquid pipe 113, so that the inside of the first liquid pipe 111, the second liquid pipe 112 and the third liquid pipe 113 reaches room temperature.

[0044] The cleaning component 2 also includes a pressure gauge 27, a return pipe 28, and a return valve 29. During normal liquid nitrogen filling, nitrogen gas flows through the first liquid pipe 111 and the second liquid pipe 112. The pressure gauge 27 is used to monitor the pressure in the second liquid pipe 112. The return pipe 28 is connected to the second liquid pipe 112 and is located between the liquid pump 13 and the first check valve 23. The return valve 29 is located on the return pipe 28 and is connected to the pressure gauge 27 for signal transmission.

[0045] When pressure gauge 27 detects that the pressure value in the second liquid pipe 112 exceeds the set range, the reflux valve 29 is opened. The liquid nitrogen in the second liquid pipe 112 flows to the reflux pipe 28 and then back to the liquid nitrogen source. The reflux pipe 28 is also equipped with a reflux master valve 281, which is located on the liquid outlet side of the reflux valve 29. The reflux pipe 28 is equipped with a reflux branch pipe 282 and a branch valve 283. The reflux branch pipe 282 is located between the reflux master valve 281 and the reflux valve 29, and the branch valve 283 is located on the reflux branch pipe 282. When liquid nitrogen refluxes in the reflux pipe 28, if the pressure in the reflux pipe 28 is too high, the branch valve 283, which is a pressure valve, will open when the opening conditions for the branch valve 283 are met, and the reflux branch pipe 282 will assist in discharging the liquid.

[0046] Furthermore, a second check valve 241 and a gas valve 242 are provided on the air blowing pipe 24. The second check valve 241 is located near the air outlet end of the air blowing pipe 24, and the gas valve 242 is located near the air inlet end of the air blowing pipe 24. When nitrogen is supplied to the third liquid pipe 113 in reverse direction from the gas end of the tank truck 3, the nitrogen will not flow into the air blowing pipe 24.

[0047] The first drain pipe 201 is connected to the first safety pipe 221, and the first safety pipe 221 is equipped with the first safety valve 231. The first safety valve 231 is a safety relief valve. When the first drain valve 201 is closed, if liquid nitrogen continues to flow in the third liquid pipe 113 and the pressure in the third liquid pipe 113 is too high, the first safety valve 231 will open and some liquid in the third liquid pipe 113 will be discharged from the first safety pipe 221. When the pressure in the third liquid pipe 113 reaches the normal range, the first safety valve 231 will close.

[0048] The second exhaust pipe 26 is connected to a second safety pipe 222, and a second safety valve 232 is installed on the second safety pipe 222. The second safety valve 232 is a safety relief valve. When the pressure in the second exhaust pipe 26 is too high, the second safety valve 232 will open when the pressure in the second exhaust pipe 26 reaches the opening level, and the gas will be discharged from the second safety pipe 222. When the pressure in the second exhaust pipe 26 reaches the normal range, the second safety valve 232 will close.

[0049] A third safety pipe 223 is connected to the first exhaust pipe 29. A third safety valve 233 is installed on the third safety pipe 223. The third safety valve 233 is a safety relief valve. When the pressure in the first exhaust pipe 29 is too high, the third safety valve 233 will open when the pressure in the first exhaust pipe 29 reaches the level required to open the third safety valve 233, and the gas in the first exhaust pipe 29 will be discharged from the third safety pipe 223. When the pressure in the first exhaust pipe 29 returns to the normal range, the third safety valve 233 will close.

[0050] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for low-temperature liquid filling, comprising a filling assembly (1), a cleaning assembly (2) and a tank truck (3), characterized in that, the filling assembly (1) comprises a liquid outlet pipe (11), a filter (12), a liquid pump (13) and a motor (14), the liquid inlet end of the liquid outlet pipe (11) is used to communicate with a liquid source, the liquid outlet end of the liquid outlet pipe (11) communicates with the tank truck (3), the filter (12) and the liquid pump (13) are arranged on the liquid outlet pipe (11), and the rotating end of the liquid pump (13) is connected to the driving end of the motor (14); the cleaning assembly (2) comprises a backflush pipe (21), an adjusting valve (22), a first air supply pipe (23) and a first check valve (25), the backflush pipe (21) and the first air supply pipe (23) communicate with the liquid outlet pipe (11), the adjusting valve (22) is arranged on the backflush pipe (21), the first check valve (25) is arranged on the first air supply pipe (23), and the air inlet end of the first air supply pipe (23) is connected to an air source.

2. The apparatus for cryogenic liquid filling of claim 1, wherein, the filling assembly (1) further comprises a second check valve (16), the liquid outlet pipe (11) comprises a first liquid pipe (111), a second liquid pipe (112) and a third liquid pipe (113), the two ends of the first liquid pipe (111) respectively communicate with the filter (12) and a liquid source, the two ends of the second liquid pipe (112) respectively communicate with the filter (12) and the second check valve (16), and the two ends of the third liquid pipe (113) respectively communicate with the second check valve (16) and the tank truck (3), and the filter (12) is arranged on the second liquid pipe (112).

3. The apparatus for cryogenic liquid fills of claim 2, wherein, the filling assembly (1) further comprises a first hose (131) and a second hose (132), the two ends of the first hose (131) respectively communicate with the liquid inlet end of the liquid pump (13) and the liquid outlet end of the first liquid pipe (111), and the two ends of the second hose (132) respectively communicate with the liquid outlet end of the liquid pump (13) and the second liquid pipe (112).

4. The apparatus for cryogenic liquid fills of claim 3, wherein, the filling assembly (1) further comprises an equal-diameter three-way valve (15), a bypass pipe (17) and a first liquid inlet valve (133), the equal-diameter three-way valve (15) is arranged on the first liquid pipe (111), the two ends of the bypass pipe (17) respectively communicate with the equal-diameter three-way valve (15) and the tank truck (3), a second liquid inlet valve (18) is arranged on the bypass pipe (17), and the first liquid inlet valve (133) is arranged on the first liquid pipe (111) and between the equal-diameter three-way valve (15) and the filter (12).

5. The apparatus for cryogenic liquid fills of claim 4, wherein, the filling assembly (1) further comprises a cleaning pipe (19) and a cleaning valve (10), the cleaning pipe (19) communicates with the bypass pipe (17), the cleaning pipe (19) is arranged between the equal-diameter three-way valve (15) and the second liquid inlet valve (18), and the cleaning valve (10) is arranged on the cleaning pipe (19).

6. The apparatus for cryogenic liquid fills of claim 5, wherein, The filling assembly (1) further comprises a total liquid inlet pipe (101) and a total liquid inlet valve (102), the bypass pipe (17) and the liquid outlet end of the third liquid pipe (113) are communicated with the liquid inlet end of the total liquid inlet pipe (101), the liquid outlet end of the total liquid inlet pipe (101) is communicated with the tank car (3), and the total liquid inlet valve (102) is arranged on the total liquid inlet pipe (101).

7. The apparatus for cryogenic liquid fills of claim 4, wherein, The cleaning assembly (2) further comprises a first exhaust pipe (29), a second exhaust pipe (26), a first exhaust valve (27) and a second exhaust valve (28), the first exhaust pipe (29) is communicated with the first liquid pipe (111), the first exhaust pipe (29) is arranged between the first liquid inlet valve (133) and the filter (12), the first exhaust valve (27) is arranged on the first exhaust pipe (29), the second exhaust pipe (26) is communicated with the second liquid pipe (112), the second exhaust valve (28) is arranged on the second exhaust pipe (26), and the first flow valve (20) is arranged between the second exhaust pipe (26) and the second check valve (16).

8. The apparatus for cryogenic liquid fills of claim 7, wherein, The cleaning assembly (2) further comprises a first exhaust pipe (29), a second exhaust pipe (26), a first exhaust valve (27) and a second exhaust valve (28), the first exhaust pipe (29) is communicated with the first liquid pipe (111), the first exhaust pipe (29) is arranged between the first liquid inlet valve (133) and the filter (12), the first exhaust valve (27) is arranged on the first exhaust pipe (29), the second exhaust pipe (26) is communicated with the second liquid pipe (112), the second exhaust valve (28) is arranged on the second exhaust pipe (26), and the first flow valve (20) is arranged between the second exhaust pipe (26) and the second check valve (16).

9. The apparatus for cryogenic liquid fills of claim 8, wherein, The cleaning assembly (2) further comprises a first exhaust pipe (29), a second exhaust pipe (26), a first exhaust valve (27) and a second exhaust valve (28), the first exhaust pipe (29) is communicated with the first liquid pipe (111), the first exhaust pipe (29) is arranged between the first liquid inlet valve (133) and the filter (12), the first exhaust valve (27) is arranged on the first exhaust pipe (29), the second exhaust pipe (26) is communicated with the second liquid pipe (112), the second exhaust valve (28) is arranged on the second exhaust pipe (26), and the first flow valve (20) is arranged between the second exhaust pipe (26) and the second check valve (16).

10. The apparatus for cryogenic liquid fills of claim 9, wherein, The cleaning assembly (2) further comprises a pressure gauge (217), a backflow pipe (218) and a backflow valve (219), the pressure gauge (217) is used for monitoring the pressure in the second liquid pipe (112), the backflow pipe (218) is communicated with the second liquid pipe (112), the backflow pipe (218) is arranged between the liquid pump (13) and the second exhaust pipe (26), and the backflow valve (219) is arranged on the backflow pipe (218).

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