Nitrogen purging assembly

Abstract

The utility model discloses a nitrogen purging assembly which comprises a three-way control valve set connected to the liquid outlet end of a crane pipe and a corrugated hose installed on a tank car quick connector, a main liquid conveying pipe is installed at the end, away from the crane pipe, of the three-way control valve set, and a Y-shaped three-way pipe is installed at the end, away from the three-way control valve set, of the main liquid conveying pipe. Opposite ports of the Y-shaped three-way pipe and the corrugated hose are connected through flanges, and a one-way air inlet valve is installed at the top end of the Y-shaped three-way pipe. The three-way control valve group is utilized to accurately control the flow and direction of nitrogen, so that the nitrogen can be shunted according to a preset path, the nitrogen can be cleaned to each dead corner and turning of a pipeline, the residual liquid cleaning efficiency is improved, and the Y-shaped three-way pipe is designed to ensure that a part of residual liquid directly enters a tank car, so that the residual liquid cleaning efficiency is improved. Therefore, the pollution risk to other areas is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical pipeline port cleaning, in particular to a nitrogen purge component. Background Art

[0002] Nitrogen purge components play a vital role in the tank truck loading and unloading process at the liquid chemical storage terminal. They mainly use high-pressure nitrogen gas flow to remove residual liquids in pipes and joints, prevent chemical cross-contamination, reduce safety risks, reduce chemical waste, and increase the service life of the equipment. At the end of tank truck loading and unloading, chemicals may remain in the pipe and valve joints. These residual liquids may not only cause cross-contamination, but also cause safety hazards such as corrosion, leakage or explosion. Nitrogen purge introduces nitrogen into the pipeline to completely blow out the liquid, avoiding these potential dangers. At the same time, the nitrogen purge components include nitrogen cylinders, pressure reducing valves, flow meters, purge pipes, joints, control valves and safety devices, which can ensure stable, safe and efficient cleaning work;

[0003] For example, a nitrogen purge assembly disclosed in the authorization announcement number CN214535692U includes a crane pipe, and a first quick-release connector valve is provided on the tank truck. The characteristics are: a second quick-release connector valve is provided at one end of the crane pipe and is connected to the first quick-release connector valve; a connecting valve is also provided on the crane pipe, and a nitrogen pipe is also connected to the crane pipe, and the nitrogen pipe is provided with a nitrogen connecting valve. By arranging the nitrogen pipe on the crane pipe, after the liquid transfer to the tank truck is completed, the nitrogen connecting valve on the nitrogen pipe is opened, and the pipeline between the second quick-release connector valve and the crane pipe connecting valve is purged with high-pressure nitrogen, so that the residual liquid in the pipeline enters the tank truck under the nitrogen purge. However, during use of the above technical solution, the nitrogen entering from the nitrogen connecting valve will be divided into two air flows by the nitrogen pipe, which respectively impact the residual liquid at the second quick-release connector valve and the crane pipe connecting valve. Since the crane pipe connecting valve is in a normally closed state, the nitrogen and residual liquid cannot completely enter the pipeline on the other side of the crane pipe connecting valve. At this time, there is always residual liquid in the pipeline on the side of the crane pipe connecting valve away from the crane pipe. Utility Model Content

[0004] The purpose of the utility model is to provide a nitrogen purge assembly, which utilizes a three-way control valve group, a main liquid infusion pipe, a Y-shaped three-way pipe, a one-way air inlet valve, and a nitrogen connecting valve to connect the crane pipe and the valve on the tank truck. When the nitrogen connecting valve and the one-way air inlet valve fill the Y-shaped three-way pipe with nitrogen, the nitrogen blows the residual liquid in the main liquid infusion pipe into the tank truck, and the other part of the residual liquid is discharged through the three-way control valve group, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a nitrogen purge assembly, comprising a three-way control valve group connected to the liquid outlet end of a crane pipe and a corrugated hose installed on a tank truck quick-connect connector, the three-way control valve group having a main liquid infusion pipe installed at one end away from the crane pipe, and the main liquid infusion pipe having a Y-shaped three-way pipe installed at one end away from the three-way control valve group, flange connections being made between the opposite ends of the Y-shaped three-way pipe and the corrugated hose, a one-way air inlet valve installed at the top end of the Y-shaped three-way pipe, and a nitrogen connecting valve installed at the top end of the one-way air inlet valve, the nitrogen connecting valve being used to connect to the nitrogen supply end.

[0006] Preferably, the three-way control valve group includes a T-shaped three-way pipe fixed at one end of the main infusion pipe and a secondary switch valve installed at the bottom end of the T-shaped three-way pipe. A crane pipe connecting valve is installed at the end of the T-shaped three-way pipe away from the main infusion pipe, and the crane pipe connecting valve is connected to the liquid outlet end of the crane pipe.

[0007] Preferably, flanges are fixed on opposite ends of the main infusion pipe and the T-shaped three-way pipe, and the two flanges are bolted to each other.

[0008] Preferably, a tapered tube is integrally formed at one end of the Y-shaped tee tube close to the main infusion tube, and the outer diameter of the tapered tube gradually increases from one end close to the Y-shaped tee tube to the other end.

[0009] Preferably, a right-angle elbow is fixed to one end of the Y-shaped tee away from the main infusion pipe, and flange connections are formed between the right-angle elbow and the opposite ends of the corrugated hose.

[0010] Preferably, the upper branch pipe of the Y-shaped tee is inclined toward the main infusion pipe, and the central axis of the upper branch pipe of the Y-shaped tee intersects with the central axis of the main infusion pipe to form an angle of 45 degrees to 75 degrees.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: the nitrogen purge assembly can efficiently remove residual liquid in the pipeline through the reasonable connection and coordinated work of components such as the three-way control valve group, the main liquid infusion pipe, the Y-shaped three-way pipe, the one-way air inlet valve, and the nitrogen connecting valve. The three-way control valve group can accurately control the nitrogen flow and direction, so that the nitrogen can be diverted according to a preset path, ensuring that the nitrogen can be swept to every dead corner and turn in the pipeline, thereby improving the residual liquid removal efficiency, and the design of the Y-shaped three-way pipe can ensure that a part of the residual liquid directly enters the tank truck, thereby reducing the risk of pollution to other areas, and the other part of the residual liquid is discharged through the three-way control valve group, which can effectively avoid the retention of residual liquid in the pipeline and keep the pipeline clean. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0013] Figure 2 This is a schematic diagram of the three-dimensional structure of the utility model Figure 1 ;

[0014] Figure 3 This is a schematic diagram of the three-dimensional structure of the utility model Figure 2 ;

[0015] Figure 4 This is a schematic diagram of the three-dimensional structure of the utility model Figure 3 ;

[0016] Figure 5 It is a schematic diagram of the three-dimensional cross-sectional structure of the utility model.

[0017] In the figure: 1. Main infusion pipe; 2. Three-way control valve group; 201. T-type three-way pipe; 202. Crane pipe connecting valve; 203. Secondary switch valve; 3. Y-type three-way pipe; 4. One-way air inlet valve; 5. Nitrogen connecting valve; 6. Right-angle elbow; 7. Corrugated hose. DETAILED DESCRIPTION

[0018] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-5 The utility model provides an embodiment of a nitrogen purge assembly, comprising a three-way control valve group 2 connected to the liquid outlet end of the crane pipe and a corrugated hose 7 installed on the tank truck quick-connect joint. A main liquid infusion pipe 1 is installed at the end of the three-way control valve group 2 away from the crane pipe, and a Y-shaped three-way pipe 3 is installed at the end of the main liquid infusion pipe 1 away from the three-way control valve group 2. The Y-shaped three-way pipe 3 and the corrugated hose 7 are flange-connected between the opposite ends. A tapered pipe is integrally formed at the end of the Y-shaped three-way pipe 3 close to the main liquid infusion pipe 1, and the outer diameter of the tapered pipe gradually increases from the end close to the Y-shaped three-way pipe 3 to the other end.

[0020] A one-way air inlet valve 4 is installed at the top of the Y-shaped three-way pipe 3, and a nitrogen connecting valve 5 is installed at the top of the one-way air inlet valve 4. The nitrogen connecting valve 5 is used to connect to the nitrogen supply end;

[0021] A right-angle elbow 6 is fixed to one end of the Y-shaped tee pipe 3 away from the main infusion pipe 1. The right-angle elbow 6 and the opposite ends of the corrugated hose 7 are flange-connected. Unlike rigid pipes, the corrugated hose 7 can be bent, twisted and adjusted in direction. Therefore, when connecting the tank truck with other equipment, it can more flexibly adapt to different angles and spatial structures. This makes it easy to handle various angles and lengths when connecting the tank truck and the crane pipe.

[0022] Flanges are fixed on the opposite ends of the main infusion pipe 1 and the T-shaped three-way pipe 201, and the two flanges are bolted to each other. The three-way control valve group 2 includes a T-shaped three-way pipe 201 fixed to one end of the main infusion pipe 1 and a secondary switch valve 203 installed at the bottom end of the T-shaped three-way pipe 201. A crane pipe connecting valve 202 is installed at the end of the T-shaped three-way pipe 201 away from the main infusion pipe 1. The crane pipe connecting valve 202 is connected to the liquid outlet end of the crane pipe. When the three-way control valve group 2 controls the chemical liquid to enter the tank truck, the staff opens the crane pipe connecting valve 202, so that the crane pipe, T-shaped three-way pipe 201, the main infusion pipe 1, the Y-shaped three-way pipe 3, the right-angle elbow 6, and the corrugated hose 7 form a passage to ensure normal liquid transportation;

[0023] When the pipeline needs to be cleaned, the staff opens the secondary switch valve 203 and closes the crane pipe connecting valve 202. The nitrogen in the Y-shaped three-way pipe 3 is diverted and enters the main infusion pipe 1 and the T-shaped three-way pipe 201 until the nitrogen and residual liquid are discharged through the secondary switch valve 203 to ensure that there is no liquid retained in the pipeline.

[0024] The upper branch pipe of the Y-shaped tee pipe 3 is inclined toward the main infusion pipe 1. The central axis of the upper branch pipe of the Y-shaped tee pipe 3 intersects with the central axis of the main infusion pipe 1 and forms an angle of 45 to 75 degrees. The one-way air inlet valve 4 ensures that nitrogen can only enter the Y-shaped tee pipe 3 in one direction and does not allow nitrogen to flow back to other areas. It ensures the stability and controllability of nitrogen flow, avoids the backflow of airflow, and prevents the nitrogen in the pipeline from flowing back due to pressure changes, thereby ensuring a smooth and efficient nitrogen sweeping process.

[0025] When the embodiment of the present application is in use, first, the outlet end of the crane pipe is installed at the liquid inlet and outlet position of the tank truck. At this time, the outlet end of the crane pipe needs to be connected to one of the inlets of the three-way control valve group 2, and the end of the corrugated hose 7 away from the right-angle elbow 6 is connected to the quick-connect joint at the liquid inlet position of the tank truck. When the liquid chemical product is ready to be delivered to the tank truck, the staff opens the valve body on the right side of the three-way control valve group 2 and makes the nitrogen connecting valve 5 in a normally closed state. The liquid chemical product in the crane pipe is then delivered to the tank truck through the main infusion pipe 1, Y-type three-way pipe 3, right-angle elbow 6, and corrugated hose 7. After the liquid is delivered, the staff closes the valve body of the three-way control valve group 2 close to the crane pipe. At this time, the pipeline between the corrugated hose 7 and the three-way control valve group 2 is still There will be a certain amount of residual liquid, so the staff opens the nitrogen connecting valve 5 to allow nitrogen to enter the component from an external source. The nitrogen connecting valve 5 transports nitrogen to various parts of the pipeline that need to be purged through the Y-type three-way pipe 3, especially the part where the tank truck is connected to the crane pipe and the dead corners and turns inside the pipeline. In this process, nitrogen enters the pipeline through a branch of the Y-type three-way pipe 3, and blows the residual liquid in the right-angle elbow 6 and the corrugated hose 7 into the tank truck. The staff opens the lower valve body in the three-way control valve group 2, and the other branch of the Y-type three-way pipe 3 blows the residual liquid in the main infusion pipe 1 to the lower valve body of the three-way control valve group 2, so that this part of the residual liquid is also discharged synchronously until all the liquid in the pipeline is effectively removed.

Claims

1. A nitrogen purge assembly, characterized in that: The invention comprises a three-way control valve group (2) connected to the liquid outlet end of the crane pipe and a corrugated hose (7) installed on the quick-connect joint of the tank truck, wherein the end of the three-way control valve group (2) away from the crane pipe is installed with a main liquid infusion pipe (1), and the end of the main liquid infusion pipe (1) away from the three-way control valve group (2) is installed with a Y-shaped three-way pipe (3), and the opposite ends of the Y-shaped three-way pipe (3) and the corrugated hose (7) are flange-connected, and the top end of the Y-shaped three-way pipe (3) is installed with a one-way air inlet valve (4), and the top end of the one-way air inlet valve (4) is installed with a nitrogen connecting valve (5), and the nitrogen connecting valve (5) is used to connect to the nitrogen supply end.

2. A nitrogen purge assembly according to claim 1, characterized in that: The three-way control valve assembly (2) comprises a T-shaped three-way pipe (201) fixed to one end of the main liquid infusion pipe (1) and a secondary switch valve (203) installed at the bottom end of the T-shaped three-way pipe (201); a crane pipe connecting valve (202) is installed at one end of the T-shaped three-way pipe (201) away from the main liquid infusion pipe (1); and the crane pipe connecting valve (202) is connected to the liquid outlet end of the crane pipe.

3. A nitrogen purge assembly according to claim 2, characterized in that: Flanges are fixed on the opposite ends of the main liquid infusion pipe (1) and the T-shaped three-way pipe (201), and the two flanges are bolted to each other.

4. The nitrogen purge assembly according to claim 1, characterized in that: The Y-shaped three-way pipe (3) is integrally formed with a tapered pipe at one end close to the main infusion pipe (1), and the outer diameter of the tapered pipe gradually increases from one end close to the Y-shaped three-way pipe (3) to the other end.

5. The nitrogen purge assembly according to claim 1, characterized in that: A right-angle elbow (6) is fixed to one end of the Y-shaped three-way pipe (3) away from the main infusion pipe (1), and the opposite ends of the right-angle elbow (6) and the corrugated hose (7) are flange-connected.

6. The nitrogen purge assembly according to claim 1, characterized in that: The upper branch pipe of the Y-shaped tee pipe (3) is inclined toward the main infusion pipe (1), and the central axis of the upper branch pipe of the Y-shaped tee pipe (3) intersects with the central axis of the main infusion pipe (1) to form an angle of 45 to 75 degrees.

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