Filling device capable of recycling low-temperature products of vehicle filling pipeline

Abstract

The utility model relates to the technical field of low-temperature liquid filling in the air separation industry, and discloses a filling device capable of recycling low-temperature products of a vehicle filling pipeline, which comprises a purging gas buffer tank, a purging gas pipe, a purging valve, a liquid outlet pipe, a liquid outlet valve and a metal hose, the metal hose is connected between the liquid outlet pipe and the low-temperature liquid tank car, the liquid outlet valve is arranged on the liquid outlet pipe, the purging gas buffer tank is filled with purging gas which is the same as liquid filled in the low-temperature liquid tank car, the purging gas pipe is connected between the liquid outlet pipe and the purging gas buffer tank, and the purging gas pipe is connected with the purging gas buffer tank. The purging air pipe is connected to the end, close to the metal hose relative to the liquid outlet valve, of the liquid outlet pipe, and the purging valve is arranged on the purging air pipe and used for controlling air outlet of the purging air pipe. The device has the effects of reducing waste of liquid products during filling of the tank car and reducing the potential safety hazard of frostbite of personnel.

Description

Technical Field

[0001] This application relates to the technical field of cryogenic liquid filling in the air separation industry, and in particular to a filling device for recyclable cryogenic products in vehicle filling pipelines. Background Technology

[0002] The cryogenic liquid filling technology in the air separation industry is mainly designed for the transportation of cryogenic liquids, such as liquid oxygen, liquid nitrogen, and liquid argon, by filling them from cryogenic liquid storage tanks into cryogenic liquid tank trucks for easy transportation and use.

[0003] During filling, the cryogenic liquid storage tank and the cryogenic liquid tank truck are usually connected by a metal hose. After filling is completed, the operator closes the outlet valve on the cryogenic liquid storage tank and the inlet valve on the cryogenic liquid tank truck in sequence. Then, the connected metal hose is removed, and the cryogenic liquid that has leaked out of the metal hose is sprayed clean, and the filling is completed.

[0004] Regarding the aforementioned technologies, after filling, cryogenic liquid will remain inside the metal hose. When the operator removes the metal hose, the cryogenic liquid inside the pipe will spray out. This discharge method poses a safety risk of cryogenic liquid splashing and causing frostbite to personnel, and also results in the waste of liquid products from the air separation unit. Utility Model Content

[0005] To reduce the waste of liquid products during tanker filling and to reduce the safety hazard of frostbite to personnel, this application provides a filling device for recyclable cryogenic products in the filling pipeline.

[0006] This application provides a filling device for recyclable cryogenic products in vehicle charging pipelines, employing the following technical solution:

[0007] A filling device for recyclable cryogenic products in a charging pipeline includes a purge gas buffer tank, a purge gas pipe, a purge valve, a liquid outlet pipe, a liquid outlet valve, and a metal hose. The liquid outlet pipe is connected to a cryogenic liquid storage tank, and the metal hose is connected between the liquid outlet pipe and a cryogenic liquid tank truck. The liquid outlet valve is located on the liquid outlet pipe. The purge gas buffer tank is filled with the same purge gas as the liquid in the cryogenic liquid storage tank. The purge gas pipe is connected between the liquid outlet pipe and the purge gas buffer tank, and is connected to the end of the liquid outlet pipe near the metal hose opposite to the liquid outlet valve. The purge valve is located on the purge gas pipe and is used to control the purge gas outlet.

[0008] By adopting the above technical solution, the filling device, through the introduction of a purge gas buffer tank and purge gas pipe, as well as the control of the purge valve, achieves the function of purging the filling pipeline after filling with cryogenic products. This effectively avoids residual cryogenic liquid in the pipeline, reduces waste, and improves filling efficiency. At the same time, it can also reduce the safety hazard of frostbite to personnel when disassembling metal hoses.

[0009] Optionally, a one-way valve is also included, which is disposed on the purge gas pipe and can restrict gas or liquid from entering the purge gas buffer tank from the liquid outlet pipe.

[0010] By adopting the above technical solution, the one-way valve further enhances the safety of the device, effectively preventing gas or liquid from flowing back from the outlet pipe into the purge gas buffer tank.

[0011] Optionally, the system also includes a purge line pressure relief valve and a pressure gauge. The purge line pressure relief valve is located on the liquid outlet pipe and at the end of the liquid outlet pipe that is closer to the metal flexible hose than the purge air pipe. The pressure gauge is located on the purge air pipe.

[0012] By adopting the above technical solution, the pressure relief valve can automatically release pressure when the pressure is too high, and can also release the pressure in the purging tube after the purging is completed; while the pressure gauge can monitor the pressure in the purging tube in real time to ensure the smooth progress of the purging process.

[0013] Optionally, a connecting seat is provided on the side wall of the liquid outlet pipe, a plug pipe is provided at the end of the metal hose, and a connector for connecting the plug pipe is provided on the connecting seat.

[0014] By adopting the above technical solution, through the setting of the connecting seat and the plug pipe, and the cooperation of the connecting parts, a fast and stable connection between the metal hose and the liquid outlet pipe is achieved; this connection method not only simplifies the installation process, but also improves the reliability and durability of the connection.

[0015] Optionally, the connector is a connecting ring rotatably mounted on the connecting seat. A locking ring is provided on the outer wall of the connecting seat, and a locking groove is provided on the inner wall of the connecting ring for the locking ring to engage and rotate. An internal thread is provided at one end of the connecting ring near the metal hose, and an external thread that mates with the internal thread is provided at the end of the insertion tube.

[0016] By adopting the above technical solution, the design of the connecting ring, the locking ring, and the locking groove enables the connector to rotate and be firmly fixed on the connecting seat.

[0017] Optionally, the connector has a first through hole for gas to pass through, the insertion tube has a second through hole for gas to pass through, the connector has a sealing element for closing the first through hole, and the insertion tube has an unlocking element for unlocking the first through hole.

[0018] By adopting the above technical solution, the cooperation of the first through hole, the second through hole, the sealing component, and the unlocking component provides a controllable ventilation method for the device. When ventilation is not required, the sealing component can close the first through hole to prevent gas leakage. When ventilation is required, the unlocking component can unlock the first through hole to allow gas to pass through. This design not only ensures the safety of the device but also improves its flexibility.

[0019] Optionally, the connector may also have a positioning groove, the diameter of which is larger than the diameter of the first through hole. The sealing element includes a spring and a sealing ball disposed in the positioning groove. The sealing ball is disposed at the end of the connector that is closer to the spring than the insertion tube. The spring can always drive the sealing ball to seal the first through hole.

[0020] By adopting the above technical solution, the design of the spring and the sealing ball ensures that the sealing component can always maintain the sealing state of the first through hole. This design not only improves the reliability of the sealing, but also allows the sealing of the first through hole to be quickly restored after the unlocking component is unlocked, ensuring the safety and convenience of the device.

[0021] Optionally, the unlocking component is an unlocking tube disposed inside the insertion tube. One end of the unlocking tube is connected to the second through hole, and the other end of the unlocking tube extends out of the insertion tube. An vent hole is opened at the end of the unlocking tube away from the insertion tube. When the insertion tube is connected to the connecting seat, the end of the unlocking tube can drive the sealing ball to move toward the spring.

[0022] By adopting the above technical solution, the design of the unlocking tube provides a simple and effective way to unlock the first through hole. When the insertion tube is connected to the connecting seat, the unlocking tube can drive the sealing ball to move, thereby unlocking the first through hole. This design not only simplifies the operation process, but also improves the accuracy and efficiency of unlocking.

[0023] Optionally, the outer diameter of the end of the connector facing away from the outlet pipe gradually decreases, and the insertion pipe end is provided with a first receiving groove for the connector end to be inserted.

[0024] By adopting the above technical solution, the gradually decreasing outer diameter of the connector end and the first receiving groove on the plug tube make it easier for the connector to be inserted into the plug tube and fit tightly with it; this design not only improves the stability and reliability of the connection, but also improves the sealing of the connection.

[0025] Optionally, the connecting seat is also provided with a sealing cover, the outer wall of the sealing cover is provided with external threads and can be threadedly connected with the connecting ring, and the sealing cover is provided with a second receiving groove for accommodating the end of the connecting seat.

[0026] By adopting the above technical solution, the sealing cap provides an additional sealing method for the device. When the connecting seat is connected to the insertion pipe, the sealing cap can be threaded onto the connecting ring and cover the end of the connecting seat, thereby further preventing gas leakage.

[0027] In summary, this application includes at least one of the following beneficial effects:

[0028] 1. By introducing a purge gas buffer tank and purge gas pipe, as well as controlling the purge valve, the function of purging the filling pipeline after filling with cryogenic products is realized; this effectively avoids residual cryogenic liquid in the pipeline, reduces waste, and improves filling efficiency; at the same time, it can also reduce the safety hazard of frostbite to personnel when disassembling metal hoses.

[0029] 2. Through the cooperation of the connector, insertion pipe and connecting parts, a fast and stable connection between the purge air pipe and the liquid outlet pipe is achieved. Attached Figure Description

[0030] Figure 1 This is a structural schematic diagram of Example 1;

[0031] Figure 2 This is a structural schematic diagram of Example 2;

[0032] Figure 3 This is a schematic diagram of the connection structure of the sealing cap.

[0033] Explanation of reference numerals in the attached drawings: 101, cryogenic liquid storage tank; 102, cryogenic liquid tanker; 1, purge gas buffer tank; 2, purge gas pipe; 21, purge valve; 22, check valve; 23, purge pipeline pressure relief valve; 24, pressure gauge; 3, liquid outlet pipe; 31, liquid outlet valve; 32, liquid filling pump; 4, metal hose; 5, connecting seat; 51, locking ring; 52, first through hole; 53, positioning groove; 54, connecting ring; 6, insertion pipe; 61, second through hole; 62, first receiving groove; 7, sealing element; 71, spring; 72, sealing ball; 8, unlocking element; 81, unlocking pipe; 811, vent hole; 9, sealing cap; 91, second receiving groove. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0035] Example 1:

[0036] This application discloses a filling device for recyclable cryogenic products in vehicle charging pipelines. (Refer to...) Figure 1 The filling device is mainly used to deliver cryogenic liquids, such as liquid oxygen, liquid nitrogen, and liquid argon, from the cryogenic liquid storage tank 101 into the cryogenic liquid tank truck 102. The filling device includes an outlet pipe 3 connected to the cryogenic liquid storage tank 101, an outlet valve 31 and a liquid filling pump 32 installed on the outlet pipe 3, and a metal hose 4 connecting the outlet pipe 3 and the cryogenic liquid tank truck 102. The liquid in the cryogenic liquid storage tank 101 can be delivered into the cryogenic liquid tank truck 102 along the metal hose 4. The liquid filling pump 32 and the outlet valve 31 are both installed on the outlet pipe 3. The liquid filling pump 32 provides pressure to deliver the liquid in the cryogenic liquid storage tank 101 into the cryogenic liquid tank truck 102, and the outlet valve 31 controls the opening and closing of the outlet pipe 3, thereby closing the outlet pipe 3 promptly after filling is completed.

[0037] Reference Figure 1 In this embodiment of the application, the filling device further includes a purge gas buffer tank 1, a purge gas pipe 2, and a purge valve 21; wherein, the purge gas buffer tank 1 is filled with the same purge gas as the liquid filled in the cryogenic liquid storage tank 101, the purge gas pipe 2 is connected between the liquid outlet pipe 3 and the purge gas buffer tank 1, and one end of the purge gas pipe 2 is connected to the liquid outlet pipe 3 and the end of the liquid outlet pipe 3 that is close to the metal hose 4 relative to the liquid outlet valve 31, and the purge valve 21 is provided on the purge gas pipe 2 for controlling the gas output of the purge gas pipe 2.

[0038] With the above structure, after filling is completed, the liquid outlet valve 31 is closed first, stopping the liquid outlet of the cryogenic liquid storage tank 101; then, the purge valve 21 is opened, and the gas in the purge gas buffer tank 1 is sent into the liquid outlet valve 31 through the purge gas pipe 2. The gas pushes the liquid in the metal hose 4 to flow into the tank truck, thereby recovering the residual liquid in the metal hose 4. Furthermore, when the same amount of gas enters the metal hose 4, it will cause some of the cryogenic liquid in the pipeline to vaporize, thereby further increasing the pressure in the pipeline and improving the effect of pushing the liquid. This design can effectively recover the liquid product in the metal hose 4 filled by the cryogenic liquid tank truck 102, thereby achieving cost reduction and efficiency improvement of the air separation filling unit; at the same time, by draining the residual liquid in the metal hose 4 into the tank truck, it can prevent operators from being frostbitten when disassembling the metal hose 4, improving operational safety.

[0039] Reference Figure 1 Furthermore, the filling device also includes a one-way valve 22, which is disposed on the purge gas pipe 2 and can restrict gas or liquid from entering the purge gas buffer tank 1 from the liquid outlet pipe 3. The one-way valve 22 is preferably disposed at the end of the purge gas pipe 2 that is closer to the liquid outlet pipe 3 relative to the purge valve 21.

[0040] Optionally, the filling device may also include a purge line pressure relief valve 23, which is installed on the outlet pipe 3 and located at the end of the outlet pipe 3 relative to the purge air pipe 2, closer to the metal hose 4. The function of the purge line pressure relief valve 23 is to release the pressure inside the metal hose 4 and the purge air pipe 2 after the purge is completed, by closing the purge valve 21 and then activating the purge line pressure relief valve 23, thus preventing safety hazards when operators disassemble the purge air pipe 2 and the metal hose 4.

[0041] Optionally, the filling device may also include a pressure gauge 24, which is installed on the purge gas pipe 2, preferably between the purge valve 21 and the one-way valve 22. The pressure gauge 24 is used to monitor the pressure inside the purge gas pipe 2 in real time, thereby adjusting the pressure value inside the purge gas pipe 2 according to the tank truck pressure, so that the gas sent out can smoothly enter the liquid outlet pipe 3, and the liquid can be pushed from the metal hose 4 into the cryogenic liquid tank truck 102. The implementation principle of a filling device for recyclable filling pipeline cryogenic products according to an embodiment of this application is as follows: During filling, the cryogenic liquid storage tank 101 and the cryogenic liquid tank truck 102 are first connected using the metal hose 4, and the liquid outlet valve 31 is opened for filling; after filling, the liquid outlet valve 31 is closed, the purge gas pipe 2 is connected, the purge valve 21 is opened, and the metal pipeline is purged; after purging, the purge pipeline pressure relief valve 23 is opened to release pressure, and finally, the purge gas pipe 2 and the metal hose 4 are disassembled in sequence.

[0042] Example 2:

[0043] This application further discloses the connection structure between the purge gas pipe 2 and the liquid outlet pipe 3, based on embodiment 1. Specifically, refer to... Figure 2 In this embodiment of the application, a connecting seat 5 is fixed on the side wall of the liquid outlet pipe 3, and a plug pipe 6 is fixed at the end of the metal hose 4. A connector for connecting the plug pipe 6 is provided on the connecting seat 5.

[0044] Specifically, the connecting seat 5 is an annular structure, preferably made of stainless steel, and can be fixed to the side wall of the outlet pipe 3 by welding; the insertion pipe 6 can also be a stainless steel round pipe structure; the connecting component is specifically set as a connecting ring 54. A locking ring 51 is fixed circumferentially on the outer wall of the connecting seat 5. The locking ring 51 has a rectangular cross-section. A locking groove is opened on the inner wall of the connecting ring 54 for the locking ring 51 to engage and rotate, so that the connecting ring 54 is rotatably connected to the connecting seat 5. The end of the connecting ring 54 near the metal hose 4 has an internal thread, and the end of the insertion pipe 6 has an external thread that matches the internal thread. When the insertion pipe 6 is connected to the connecting seat 5, by rotating the connecting ring 54, the insertion pipe 6 can be driven to move continuously towards the connecting seat 5, thereby fixing the insertion pipe 6 to the connecting seat 5, that is, connecting the purge air pipe 2 to the side wall of the outlet pipe 3.

[0045] Furthermore, in an optional embodiment, the outer diameter of the end of the connector 5 facing away from the outlet pipe 3 gradually decreases, forming a tapered transition section. The end of the insertion pipe 6 has a first receiving groove 62 for the insertion of the end of the connector 5. This design makes the docking of the connector 5 and the insertion pipe 6 easier, improving assembly efficiency. Simultaneously, the tapered transition section of the connector 5 not only serves as a guide but also compensates for dimensional errors to a certain extent, ensuring a tight connection. Furthermore, the contact surfaces of the connector 5 and the insertion pipe 6 enhance the sealing of the connection.

[0046] Reference Figure 3 In an optional embodiment, the connecting seat 5 is also provided with a sealing cover 9. One end of the sealing cover 9 is open, and the outer side wall of the open end is also provided with external threads, so that the sealing cover 9 can be threadedly connected with the connecting ring 54. The opening of the sealing cover 9 is provided with a second receiving groove 91 for receiving the end of the connecting seat 5. When the purge air pipe 2 is not used, the connecting seat 5 can be sealed by the sealing cover 9.

[0047] Reference Figure 2 In this embodiment, the connecting seat 5 has a first through hole 52, and the insertion tube 6 has a second through hole 61. When the insertion tube 6 is connected to the connecting seat 5, the first through hole 52 and the second through hole 61 are connected to each other. The connecting seat 5 is provided with a sealing element 7 for sealing the first through hole 52, and the insertion tube 6 is provided with an unlocking element 8 for unlocking the first through hole 52. Therefore, when the sealing cap 9 is removed, the first through hole 52 of the connecting seat 5 remains sealed.

[0048] Specifically, the sealing component 7 includes a spring 71 and a sealing ball 72 disposed within a positioning groove 53. The positioning groove 53 is coaxially formed with the first through hole 52, and both ends of the positioning groove 53 are connected to the first through hole 52. The sealing ball 72 is disposed at the end of the connector 6 closer to the spring 71, and the spring 71 can always drive the sealing ball 72 to seal the first through hole 52. The sealing ball 72 is preferably a metal ball to improve service life. The diameter of the metal ball is larger than that of the first through hole 52. When the spring 71 drives the sealing ball 72 to press against the first through hole 52, the sealing ball 72 can seal the first through hole 52, and gas can flow at the connecting seat 5.

[0049] The unlocking component 8 is an unlocking tube 81 installed inside the connector 6. One end of the unlocking tube 81 is fixed inside the connector 6 and connected to the second through hole 61. The other end extends out of the connector 6, and an vent hole 811 is provided on the end face away from the connector 6. Multiple vent holes 811 can be provided circumferentially. When the connector 6 is connected to the connecting seat 5, the end of the unlocking tube 81 can drive the sealing ball 72 to move towards the spring 71. The gas in the connector 6 can enter the positioning groove 53 and the first through hole 52 through the vent hole 811. The first through hole 52 is connected to the second through hole 61. That is, when the connector 6 is inserted into the connecting seat 5, the sealing component 7 is unlocked and connected. When the connector 6 is pulled out of the connecting seat 5, the sealing component 7 returns to its original position and seals the first through hole 52 under the elastic force of the spring 71.

[0050] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A filling device for recyclable cryogenic products in vehicle charging pipelines, characterized in that: The system includes a purge gas buffer tank (1), a purge gas pipe (2), a purge valve (21), a liquid outlet pipe (3), a liquid outlet valve (31), and a metal hose (4). The liquid outlet pipe (3) is connected to a cryogenic liquid storage tank (101). The metal hose (4) is connected between the liquid outlet pipe (3) and a cryogenic liquid tanker (102). The liquid outlet valve (31) is located on the liquid outlet pipe (3). The purge gas buffer tank (1) is filled with the same purge gas as the liquid in the cryogenic liquid storage tank (101). The purge gas pipe (2) is connected between the liquid outlet pipe (3) and the purge gas buffer tank (1). The purge gas pipe (2) is connected to the end of the liquid outlet pipe (3) that is closer to the metal hose (4) than the liquid outlet valve (31). The purge valve (21) is located on the purge gas pipe (2) and is used to control the purge gas outlet of the purge gas pipe (2).

2. The filling device for recyclable vehicle charging pipeline cryogenic products according to claim 1, characterized in that: It also includes a one-way valve (22), which is disposed on the purge gas pipe (2) and can restrict gas or liquid from entering the purge gas buffer tank (1) from the liquid outlet pipe (3).

3. The filling device for recyclable vehicle charging pipeline cryogenic products according to claim 1, characterized in that: It also includes a purge line pressure relief valve (23) and a pressure gauge (24). The purge line pressure relief valve (23) is installed on the liquid outlet pipe (3) and is installed at the end of the liquid outlet pipe (3) that is close to the metal hose (4) relative to the purge air pipe (2). The pressure gauge (24) is installed on the purge air pipe (2).

4. A filling device for recyclable vehicle charging pipeline cryogenic products according to any one of claims 1-3, characterized in that: A connecting seat (5) is provided on the side wall of the liquid outlet pipe (3), and a plug pipe (6) is provided at the end of the metal hose (4). A connector for connecting the plug pipe (6) is provided on the connecting seat (5).

5. A filling device for recyclable vehicle charging pipeline cryogenic products according to claim 4, characterized in that: The connector is a connecting ring (54) rotatably mounted on the connecting seat (5). A locking ring (51) is provided on the outer side wall of the connecting seat (5). A locking groove is provided on the inner side wall of the connecting ring (54) for the locking ring (51) to engage and rotate. An internal thread is provided at one end of the connecting ring (54) near the metal hose (4). An external thread that mates with the internal thread is provided at the end of the insertion pipe (6).

6. A filling device for recyclable vehicle charging pipeline cryogenic products according to claim 5, characterized in that: The connector (5) has a first through hole (52) for gas to pass through, the insert pipe (6) has a second through hole (61) for gas to pass through, the connector (5) has a sealing member (7) for sealing the first through hole (52), and the insert pipe (6) has an unlocking member (8) for unlocking the first through hole (52).

7. A filling device for recyclable vehicle charging pipeline cryogenic products according to claim 6, characterized in that: The connecting seat (5) is also provided with a positioning groove (53), the diameter of which is larger than the diameter of the first through hole (52). The sealing member (7) includes a spring (71) and a sealing ball (72) disposed in the positioning groove (53). The sealing ball (72) is disposed at the end of the connector (6) that is closer to the insertion tube (6) than the spring (71). The spring (71) can always drive the sealing ball (72) to seal the first through hole (52).

8. A filling device for recyclable vehicle charging pipeline cryogenic products according to claim 7, characterized in that: The unlocking component (8) is an unlocking tube (81) disposed in the insertion tube (6). One end of the unlocking tube (81) is connected to the second through hole (61), and the other end of the unlocking tube (81) extends out of the insertion tube (6). An air hole (811) is opened at the end of the unlocking tube (81) away from the insertion tube (6). When the insertion tube (6) is connected to the connecting seat (5), the end of the unlocking tube (81) can drive the sealing ball (72) to move toward the spring (71).

9. A filling device for recyclable vehicle charging pipeline cryogenic products according to claim 5, characterized in that: The outer diameter of the end of the connector (5) away from the liquid outlet pipe (3) gradually decreases, and the end of the insertion pipe (6) is provided with a first receiving groove (62) for the end of the connector (5) to be inserted.

10. A filling device for recyclable vehicle charging pipeline cryogenic products according to claim 9, characterized in that: The connecting seat (5) is also provided with a sealing cover (9). The outer wall of the sealing cover (9) is provided with an external thread and can be threadedly connected to the connecting ring (54). The sealing cover (9) is provided with a second receiving groove (91) for accommodating the end of the connecting seat (5).

Images