Unloading snap valve for LNG (Liquefied Natural Gas) filling station

Abstract

The utility model relates to a break-away valve, in particular to an unloading break-away valve for an LNG (Liquefied Natural Gas) filling station. The utility model relates to an unloading snap valve of an LNG (Liquefied Natural Gas) filling station, which aims to overcome the defects that in the unloading process of the LNG filling station in the prior art, an unloading snap valve cannot be notified in time after the unloading snap valve is snapped or the unloading snap valve loses efficacy and is not effectively cut off when an LNG tank car is driven away under the condition that unloading is not completed, and secondary accidents can be possibly caused. Comprising a breakaway valve body, a first electric conductor, a second electric conductor and a control unit, the breakaway valve body comprises a first valve body and a second valve body, and the first electric conductor and the second electric conductor are arranged on the side walls of the first valve body and the second valve body correspondingly and are in contact conduction; the control unit comprises a first loop, a normally open relay and a second loop; the first loop is connected with the first conductor and a coil of the normally open relay; the second loop comprises a second power supply and an audible and visual alarm, and is connected with two ends of the contact of the normally open relay.

Description

Technical Field

[0001] The utility model relates to a breakaway valve, in particular to a breakaway valve for unloading vehicles at an LNG filling station. Background Art

[0002] The breakaway valve at an LNG filling station is an important guarantee for the safe unloading of LNG. The breakaway valve currently used in the industry can only realize the mechanical disconnection function at the unloading site. The LNG tank truck may leave without completing the unloading, resulting in the breakaway valve being broken, or the breakaway valve failing to cut off the liquid effectively, which may easily cause leakage or damage to pipeline valves. Since real-time alarm and linkage functions cannot be realized, the on-duty operating personnel cannot be notified immediately after the breakaway valve is broken or the breakaway valve fails to cut off the liquid effectively, so the operating personnel cannot discover the problem in time, which may cause secondary accidents such as explosions. Utility Model Content

[0003] The utility model aims to solve the problem in the prior art that during the unloading process of an LNG filling station, the LNG tank truck leaves without completing the unloading, resulting in the unloading break valve being broken or the unloading break valve failing to be effectively cut off, and the operating personnel cannot be notified in time, which may cause a secondary accident, and provides an LNG filling station unloading break valve.

[0004] To achieve the above purpose, the technical solutions provided by the utility model are as follows:

[0005] A breakaway valve for unloading a vehicle at an LNG filling station comprises a breakaway valve body, wherein the breakaway valve body comprises a first valve body and a second valve body, and the special feature of the breakaway valve body is that it also comprises a first conductor, a second conductor and a control unit; the first conductor and the second conductor are respectively arranged on the side walls of the first valve body and the second valve body; and the first conductor and the second conductor are in contact and conductive; the control unit comprises a first circuit, a normally open relay and a second circuit; the first circuit comprises a first power supply, one end of the first power supply is connected to the first conductor, and the other end is connected to one end of a coil of the normally open relay, and the other end of the coil of the normally open relay is connected to the second conductor; the second circuit comprises a second power supply and an audible and visual alarm, one end of the second power supply is connected to one end of a contact of the normally open relay, and the other end is connected to one end of the audible and visual alarm, and the other end of the audible and visual alarm is connected to the other end of the contact of the normally open relay.

[0006] Furthermore, the first circuit also includes a power indicator light and a resistor;

[0007] One end of the power indicator light is connected to one end of the first power supply, the resistor is arranged in the circuit between the first power supply and the normally open relay, one end of the resistor is connected to the other end of the first power supply, and the other end of the resistor is respectively connected to the other end of the power indicator light and one end of the coil of the normally open relay.

[0008] Further, the second circuit also includes an upstream and downstream cut-off valve control module;

[0009] One end of the upstream and downstream cut-off valve control module is connected to the other end of the contact of the normally open relay, and the other end is connected to the other end of the sound and light alarm, which is used to connect the cut-off valves arranged upstream and downstream of the unloading break valve, and control the cut-off valve to cut off the pipeline liquid upstream and downstream of the unloading break valve in time.

[0010] Furthermore, the first conductor and the second conductor are formed of a soft graphite conductive material connected as one body.

[0011] Beneficial effects of the utility model:

[0012] 1. The utility model of the LNG gas station unloading breakaway valve is provided with a first conductor and a second conductor, and combined with a control unit, when the unloading breakaway valve is broken, the sound and light alarm is powered on, and an automatic alarm is realized after the unloading breakaway valve is broken, so that the operating personnel are informed immediately, and the on-site breakaway accident is handled in time to avoid the expansion of the accident and the occurrence of secondary accidents, thereby reducing casualties and economic losses.

[0013] 2. An upstream and downstream cut-off valve control module is also provided on the second circuit of the LNG filling station unloading break valve of the utility model, which is used to control the working status of the break valves provided upstream and downstream of the unloading break valve. When the unloading break valve is broken, the upstream and downstream cut-off valve control modules are energized to receive signals, control the cut-off valves to close, and realize the interlocking cut-off function.

[0014] 3. The utility model LNG filling station unloading breakaway valve can also be linked with the station's data acquisition and monitoring control (SCADA) system to implement necessary cut-off operations to ensure the safety of the station after unloading. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the breakaway valve body in an embodiment of the utility model;

[0016] Figure 2 It is a schematic diagram of a control unit in an embodiment of the utility model.

[0017] Description of reference numerals:

[0018] 1. First valve body; 11. First conductor; 2. Second valve body; 21. Second conductor; 3. First circuit; 31. Resistance; 32. Power indicator light; 33. First power supply; 4. Normally open relay; 5. Second circuit; 51. Sound and light alarm; 52. Upstream and downstream cut-off valve control module; 53. Second power supply. DETAILED DESCRIPTION

[0019] A breakaway valve for unloading a vehicle at an LNG filling station includes a breakaway valve body, a first conductor 11, a second conductor 21 and a control unit. The breakaway valve body includes a first valve body 1 and a second valve body 2. The first conductor 11 and the second conductor 21 are respectively arranged on the side walls of the first valve body 1 and the second valve body 2; and the first valve body 1 and the second valve body 2 are in contact and conduction. In this embodiment, the first conductor 11 and the second conductor 21 are both soft graphite conductive materials. To ensure the stability of the connection signal, the first conductor 11 and the second conductor 21 are composed of a soft graphite conductive material connected as a whole.

[0020] The control unit includes a first circuit 3 , a normally open relay 4 and a second circuit 5 .

[0021] The first circuit 3 includes a first power supply 33, a resistor 31 and a power indicator light 32. One end of the first power supply 33 is connected to the first conductor 11, and the other end is connected to one end of the resistor 31. The other end of the resistor 31 is connected to one end of the coil of the normally open relay 4, and the other end of the coil of the normally open relay 4 is connected to the second conductor 21. One end of the power indicator light 32 is connected to one end of the first power supply 33, and the other end is connected to the other end of the resistor 31. The first power supply 33 is a low-voltage power supply, which is mainly used to provide power to the power indicator light 32.

[0022] The second circuit 5 includes a second power supply 53, an audible and visual alarm 51, and an upstream and downstream cut-off valve control module 52. One end of the second power supply 53 is connected to one end of the contact of the normally open relay 4, and the other end is connected to one end of the audible and visual alarm 51. The other end of the contact of the normally open relay 4 is respectively connected to the other end of the audible and visual alarm 51 and one end of the upstream and downstream cut-off valve control module 52. The other end of the upstream and downstream cut-off valve control module 52 is connected to the other end of the audible and visual alarm 51, and is used to connect the cut-off valves arranged upstream and downstream of the unloading break valve to control its working state.

[0023] The working principle of the utility model is as follows: when the breaking piece of the unloading break valve is disconnected under the action of external force, the first conductor 11 and the second conductor 21 are disconnected, thereby the first circuit 3 is disconnected, triggering the normally open relay 4 to close, and the second circuit 5 is connected. The second power supply 53 supplies power to the sound and light alarm 51 to make it flash and alarm, so as to achieve the purpose of real-time alarm after the unloading break valve is disconnected. At the same time, the signal is transmitted to the upstream and downstream cut-off valve control module 52 to control the cut-off valve to close, and the pipeline liquid upstream and downstream of the unloading break valve is cut off in time, so as to realize the interlocking cut-off function, thereby achieving the purpose of automatic control.

[0024] The above description is only a specific implementation mode of the present utility model, but the protection scope of the present utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or substitutions within the technical scope disclosed in the present utility model, and these modifications or substitutions should be included in the protection scope of the present utility model.

Claims

1. A breakaway valve for unloading a LNG filling station, comprising a breakaway valve body, wherein the breakaway valve body comprises a first valve body (1) and a second valve body (2), characterized in that: It also includes a first conductor (11), a second conductor (21) and a control unit; The first conductor (11) and the second conductor (21) are respectively arranged on the side walls of the first valve body (1) and the second valve body (2); and the first conductor (11) and the second conductor (21) are in contact and conduction; The control unit comprises a first circuit (3), a normally open relay (4) and a second circuit (5); The first circuit (3) comprises a first power source (33), one end of the first power source (33) is connected to the first conductor (11), the other end is connected to one end of the coil of the normally open relay (4), and the other end of the coil of the normally open relay (4) is connected to the second conductor (21); The second circuit (5) comprises a second power supply (53) and an audible and visual alarm (51), one end of the second power supply (53) being connected to one end of a contact of the normally open relay (4), the other end of the second power supply (53) being connected to one end of the audible and visual alarm (51), and the other end of the audible and visual alarm (51) being connected to the other end of the contact of the normally open relay (4).

2. According to claim 1, a LNG filling station unloading breakaway valve is characterized in that: The first circuit (3) also includes a power indicator light (32) and a resistor (31); One end of the power indicator light (32) is connected to one end of the first power source (33); the resistor (31) is arranged in a circuit between the first power source (33) and the normally open relay (4); one end of the resistor (31) is connected to the other end of the first power source (33); and the other end of the resistor (31) is respectively connected to the other end of the power indicator light (32) and one end of the coil of the normally open relay (4).

3. The LNG filling station unloading breakaway valve according to claim 1 or 2, characterized in that: The second circuit (5) further includes an upstream and downstream cut-off valve control module (52); One end of the upstream and downstream cut-off valve control module (52) is connected to the other end of the contact of the normally open relay (4), and the other end is connected to the other end of the sound and light alarm (51), and is used to connect the cut-off valves arranged upstream and downstream of the unloading break valve, and control the cut-off valve to timely cut off the pipeline liquid upstream and downstream of the unloading break valve.

4. According to claim 3, a LNG filling station unloading breakaway valve is characterized in that: The first conductor (11) and the second conductor (21) are composed of a soft graphite conductive material connected as one body.

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