Liquefied natural gas filling station pump pool pipeline with multifunctional valve

Abstract

The utility model discloses a liquefied natural gas filling station pump pool pipeline with multifunctional valve, including pump pool subassembly and pipeline subassembly, including pump pool, pump pool liquid inlet, pump pool blowdown, pump pool back gas port, pump pool outlet pipeline in pump pool subassembly, including safety diffusion valve, stop valve, the pneumatic emergency stop valve with check function in pipeline subassembly, can solve the problem that back pressure is too high when the pneumatic emergency stop valve opens, medium backflow through the setting of the pneumatic emergency stop valve with check function, the integrated design of check valve and emergency stop valve can reduce the length of pipeline, also reduced equipment installation difficulty, and the emergency stop valve of two in one structure with check function can accelerate the reaction speed of valve.

Description

Technical Field

[0001] This utility model relates to a device, specifically a liquefied natural gas refueling station pump pool pipeline with a multi-functional valve. Background Technology

[0002] Both liquefied natural gas (LNG) and compressed natural gas (CNG) are primarily composed of methane. LNG is obtained by purifying gaseous natural gas at atmospheric pressure and cooling it to -162°C. CNG is obtained by compressing gaseous natural gas to a pressure between 20 MPa and 25 MPa. Both LNG and CNG can be used as vehicle fuel. To facilitate vehicle refueling, numerous LNG and CNG refueling stations have been built throughout China.

[0003] In the existing technology, in order to protect the submersible pump from backflow of liquid into its interior, multiple valves need to be installed to achieve operation and protection. Check valves and shut-off valves need to be installed separately. This method increases the length of the pipeline and the difficulty of installation, and the pipeline needs to be laid out in a reasonable way. Utility Model Content

[0004] The purpose of this invention is to provide a liquefied natural gas refueling station pump pool pipeline with a multi-functional valve to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A liquefied natural gas (LNG) refueling station pump pool pipeline with a multi-functional valve is disclosed. The pump pool assembly is connected to a storage tank via pipelines. The pump pool assembly includes a pump pool, a pump pool inlet, a pump pool drain outlet, a pump pool return gas outlet, and a pump pool outlet pipeline. The pipeline assembly includes a safety vent valve and a multi-functional shut-off valve. The pump pool inlet is located at the bottom of the pump pool and is fixedly connected to the pump pool. The pump pool drain outlet is located above the pump pool inlet and is fixedly connected to the pump pool. The pump pool return gas outlet is located on one side of the pump pool drain outlet and is fixedly connected to the pump pool. The pump pool outlet pipeline is located on one side of the pump pool return gas outlet and is fixedly connected to the pump pool at one end.

[0006] As a further embodiment of this utility model: the pipeline assembly includes a safety relief valve and a multi-functional shut-off valve, and the safety relief valve and the multi-functional shut-off valve are provided on the pump pool outlet pipeline, and the safety relief valve is installed and connected on the pump pool outlet pipeline.

[0007] As a further embodiment of this utility model: the multi-functional shut-off valve includes a valve body, a shut-off valve inlet, a shut-off valve outlet, a first valve disc, a shut-off check spring, a second valve disc, a valve stem, a piston cylinder, a piston component, a shut-off valve air inlet, a top cover, a return spring, and a shut-off exhaust port. The valve body is provided with a shut-off valve inlet and a shut-off valve outlet, and a shut-off check spring is provided at the bottom of the valve body. One end of the shut-off check spring is fixedly connected to the valve body.

[0008] As a further embodiment of this utility model: a first valve disc is provided on one side of the cut-off check spring and the check buffer, and the first valve disc is fixedly connected to the cut-off check spring on one side. A second valve disc is provided on one side of the first valve disc, and a valve stem is provided on one side of the second valve disc. The valve stem is fixedly connected to the second valve disc. A piston cylinder is provided on one side of the valve stem, and a piston component is provided in the piston cylinder. The piston component is fixedly connected to the valve stem, and the valve stem and piston component are slidably connected in the piston cylinder. A cut-off valve air inlet is provided on one side of the piston cylinder, and a top cover is provided on one side of the piston component. The top cover is fixedly connected to the piston component. A return spring is provided on one side of the top cover, and one end of the return spring is fixedly connected to the piston cylinder. A cut-off exhaust port is provided on one side of the piston cylinder.

[0009] Compared with the prior art, the beneficial effects of this utility model are: The pneumatic emergency shut-off valve with check function can solve the problem of excessive back pressure and medium backflow when the pneumatic emergency shut-off valve is opened. The integrated design of check valve and emergency shut-off valve can reduce the length of pipeline and reduce the difficulty of equipment installation. In addition, the emergency shut-off valve with check function can speed up the valve's response speed. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of a pump pool pipeline in a liquefied natural gas refueling station with multi-functional valves.

[0011] Figure 2 This is a schematic diagram of the structure of a multi-functional valve in the pump pool pipeline of a liquefied natural gas refueling station. Detailed Implementation

[0012] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0013] Please see Figures 1-2 In this embodiment of the present invention, a liquefied natural gas refueling station pump pool pipeline with a multi-functional valve includes a pump pool assembly 100 and a pipeline assembly.

[0014] The pump pool assembly 100 is connected to the storage tank via pipelines.

[0015] The pump pool assembly 100 includes a pump pool 101, a pump pool inlet 102, a pump pool drain outlet 103, a pump pool air return outlet 104, and a pump pool outlet pipeline 105. The pipeline assembly includes a safety vent valve 106 and a multi-functional shut-off valve 107. The pump pool inlet 102 is located at the bottom of the pump pool 101 and is fixedly connected to the pump pool 101. The pump pool drain outlet 103 is located above the pump pool inlet 102 and is fixedly connected to the pump pool 101. The pump pool air return outlet 104 is located on one side of the pump pool drain outlet 103 and is fixedly connected to the pump pool 101. The pump pool outlet pipeline 105 is located on one side of the pump pool air return outlet 104 and is fixedly connected to the pump pool 101 at one end.

[0016] The piping assembly includes a safety vent valve 106 and a multi-functional shut-off valve 107. The safety vent valve 106 and the multi-functional shut-off valve 107 are installed on the pump pool outlet pipe 105. The safety vent valve 106 is installed and connected to the pump pool outlet pipe 105.

[0017] The multi-functional shut-off valve 107 includes a valve body 1701, a shut-off valve inlet 1702, a shut-off valve outlet 1703, a first valve disc 1704, a shut-off check spring 1705, a second valve disc 1706, a valve stem 1707, a piston cylinder 1708, a piston component 1709, a shut-off valve air inlet 1710, a top cover 1711, a return spring 1712, and a shut-off exhaust port 1713. The valve body 1701 has a shut-off valve inlet 1702 and a shut-off valve outlet 1703. A shut-off check spring 1705 is located at the bottom of the valve body 1701, with one end fixedly connected to the valve body 1701. The first valve disc 1704 is located on one side of the shut-off check spring 1705, which is paired with a check buffer. One side of the first valve disc 1704 is fixedly connected to the shut-off check spring 1705. A second valve disc 1706 is provided on one side of valve disc 1704, and a valve stem 1707 is provided on one side of the second valve disc 1706. The valve stem 1707 is fixedly connected to the second valve disc 1706. A piston cylinder 1708 is provided on one side of valve stem 1707, and a piston component 1709 is provided in the piston cylinder 1708. The piston component 1709 is fixedly connected to the valve stem 1707, and the valve stem 1707 and the piston component 1709 are slidably connected in the piston cylinder 1708. A shut-off valve inlet 1710 is provided on one side of piston cylinder 1708, and a top cover 1711 is provided on one side of piston component 1709. The top cover 1711 is fixedly connected to the piston component 1709. A return spring 1712 is provided on one side of the top cover 1711, and one end of the return spring 1712 is fixedly connected to the piston cylinder 1708. A shut-off exhaust port 1713 is provided on one side of piston cylinder 1708.

[0018] The working principle of this utility model is as follows: When the pneumatic emergency shut-off valve is opened, the air compressor supplies compressed air at a certain pressure to the cylinder of the valve actuator through a two-position three-way solenoid valve. This pushes the valve piston to overcome the spring resistance, causing the valve stem and valve core to move upward, so that the valve core leaves the valve seat and the valve opens. At this time, the medium can pass through the internal flow channel of the valve.

[0019] When the downstream of the pneumatic emergency shut-off valve no longer needs fluid supply or an abnormal accident occurs, the control system will quickly send a signal to the two-position three-way solenoid valve to cut off the compressed air supply. At the same time, it will open the discharge port to quickly discharge the compressed air in the cylinder. At this time, the piston in the cylinder of the pneumatic emergency shut-off valve will move downward under the action of the spring force, which will drive the valve stem and valve core to quickly reset. The valve core presses against the valve port, thereby closing the pneumatic emergency shut-off valve.

[0020] When the medium pressure at the valve inlet is greater than the spring force inside the check valve body, the valve opens, allowing the medium to pass through the internal flow channel of the valve.

[0021] During operation, the pneumatic emergency shut-off valve with check function can solve the problem of excessive back pressure and medium backflow when the pneumatic emergency shut-off valve is opened. The integrated design of check valve and emergency shut-off valve can reduce the length of pipeline and reduce the difficulty of equipment manufacturing and installation. In addition, the emergency shut-off valve with check function can speed up the valve's response speed.

[0022] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A liquefied natural gas (LNG) refueling station pump pool pipeline with multi-functional valves, comprising a pump pool assembly (100), characterized in that, The pump pool assembly (100) is connected to the storage tank via pipelines. The pump pool assembly (100) includes a pump pool (101), a pump pool inlet (102), a pump pool drain outlet (103), a pump pool air return outlet (104), and a pump pool outlet pipeline (105). The pipeline assembly includes a safety vent valve (106) and a multi-functional shut-off valve (107). The bottom of the pump pool (101) is provided with a pump pool inlet (102), which is fixedly connected to the pump pool (101). 01) Above the pump pool inlet (102), there is a pump pool drain outlet (103), which is fixedly connected to the pump pool (101). On one side of the pump pool drain outlet (103), there is a pump pool air return outlet (104), which is fixedly connected to the pump pool (101). On one side of the pump pool air return outlet (104), there is a pump pool outlet pipe (105), one end of which is fixedly connected to the pump pool (101).

2. The liquefied natural gas refueling station pump pool pipeline with a multi-functional valve according to claim 1, characterized in that, The piping assembly includes a safety vent valve (106) and a multi-functional shut-off valve (107). The pump pool outlet pipe (105) is equipped with a safety vent valve (106) and a multi-functional shut-off valve (107). The safety vent valve (106) is installed and connected to the pump pool outlet pipe (105).

3. The liquefied natural gas refueling station pump pool pipeline with a multi-functional valve according to claim 1, characterized in that, The multi-functional shut-off valve (107) includes a valve body (1701), a shut-off valve inlet (1702), a shut-off valve outlet (1703), a first valve disc (1704), a shut-off check spring (1705), a second valve disc (1706), a valve stem (1707), a piston cylinder (1708), a piston component (1709), a shut-off valve air inlet (1710), a top cover (1711), a return spring (1712), and a shut-off exhaust port (1713). The valve body (1701) is provided with a shut-off valve inlet (1702) and a shut-off valve outlet (1703). The bottom of the valve body (1701) is provided with a shut-off check spring (1705), one end of which is fixedly connected to the valve body (1701).

4. The liquefied natural gas refueling station pump pool pipeline with a multi-functional valve according to claim 3, characterized in that, A first valve disc (1704) is provided on one side of the cut-off check spring (1705) and the check buffer. The first valve disc (1704) is fixedly connected to the cut-off check spring (1705) on one side. A second valve disc (1706) is provided on one side of the first valve disc (1704). A valve stem (1707) is provided on one side of the second valve disc (1706). The valve stem (1707) is fixedly connected to the second valve disc (1706). A piston cylinder (1708) is provided on one side of the valve stem (1707). A piston component (1709) is provided in the piston cylinder (1708). The piston component (1709) is connected to the valve stem. (1707) Fixed connection, the valve stem (1707) and the piston (1709) are slidably connected in the piston cylinder (1708), the piston cylinder (1708) is provided with a shut-off valve air inlet (1710) on one side, the piston (1709) is provided with a top cover (1711) on one side, the top cover (1711) is fixedly connected to the piston (1709), the top cover (1711) is provided with a return spring (1712) on one side, one end of the return spring (1712) is fixedly connected to the piston cylinder (1708), and the piston cylinder (1708) is provided with a shut-off exhaust port (1713) on one side.

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