CN-224231376-U - Vacuum degree maintaining device

Abstract

The utility model relates to the technical field of liquefied natural gas sampling, in particular to a vacuum degree maintaining device. The device comprises a first vacuumizing port, a first on-off switch, a first pressure monitoring unit, a control unit and a vacuum pump, wherein the first vacuumizing port is used for being connected with a first sampling probe capable of collecting liquefied natural gas from outside, the vacuum pump is connected with the first vacuumizing port, the first on-off switch and the first pressure monitoring unit are both arranged on a connecting pipeline of the first vacuumizing port and the vacuum pump, the first pressure monitoring unit is located between the first vacuumizing port and the first on-off switch and used for monitoring a first pressure value in the first sampling probe in real time and transmitting the first pressure value to the control unit, the control unit is connected with the first on-off switch and the vacuum pump and used for comparing the first pressure value with a preset value and controlling the on-off switch and the vacuum pump to be turned on or off according to a first comparison result. The utility model can realize the automatic maintaining function of the vacuum degree in the first sampling probe and has higher reliability.

Inventors

• SHEN XUPING
• HUO GUANGHUA
• Pan boyuan
• ZHANG JIANBIN
• GAO JINGLU

Assignees

• 新奥(舟山)液化天然气有限公司

Dates

Publication Date

20260512

Application Date

20250401

Claims (10)

1. 1. The vacuum degree maintaining device is characterized by comprising a first vacuumizing port, a first on-off switch, a first pressure monitoring unit, a control unit and a vacuum pump, wherein, The first vacuumizing port is used for being connected with a first sampling probe capable of collecting liquefied natural gas from the outside; The vacuum pump is connected with the first vacuumizing port; The first on-off switch and the first pressure monitoring unit are both arranged on a connecting pipeline of the first vacuumizing port and the vacuum pump, the first pressure monitoring unit is positioned between the first vacuumizing port and the first on-off switch, and the first pressure monitoring unit is used for monitoring a first pressure value in the first sampling probe in real time and transmitting the first pressure value to the control unit; The control unit is connected with the first on-off switch and the vacuum pump, and is used for comparing a first pressure value with a preset value and controlling the on-off switch and the vacuum pump to be turned on or off according to a first comparison result.
2. 2. The vacuum degree holding device according to claim 1, further comprising a thermal insulation cabinet, wherein the first on-off switch, the first pressure monitoring unit and the vacuum pump are all arranged in the thermal insulation cabinet, the first vacuumizing port is arranged on the thermal insulation cabinet and exposed out of the thermal insulation cabinet, and an exhaust port connected with the vacuum pump is arranged on the thermal insulation cabinet.
3. 3. The vacuum level holding apparatus of claim 2, further comprising a cooler provided on the thermal cabinet for reducing the temperature in the thermal cabinet when the temperature in the thermal cabinet is higher than a first preset temperature value and a heater provided in the thermal cabinet for elevating the temperature in the thermal cabinet when the temperature in the thermal cabinet is lower than a second preset temperature value.
4. 4. A vacuum degree holding apparatus according to claim 3, further comprising a temperature control valve connected to the cooler and a first air source interface connected to a control end of the temperature control valve, the temperature control valve being provided in the thermal insulation cabinet, the first air source interface being provided on the thermal insulation cabinet and exposed to the thermal insulation cabinet.
5. 5. The vacuum degree holding apparatus according to any one of claims 2 to 4, further comprising a second vacuumizing port, a second pressure monitoring unit and a second on-off switch, wherein the second vacuumizing port is arranged on the thermal insulation cabinet and exposed out of the thermal insulation cabinet, the second vacuumizing port is used for being connected with a second sampling probe capable of collecting liquefied natural gas from outside, the vacuum pump is further connected with the second vacuumizing port, the second on-off switch and the second pressure monitoring unit are arranged on a connecting pipeline of the second vacuumizing port and the vacuum pump, the second pressure monitoring unit is arranged between the second vacuumizing port and the second on-off switch, the second pressure monitoring unit is used for monitoring a second pressure value in the second sampling probe in real time and transmitting the second pressure value to the control unit, and the control unit is further used for comparing the second pressure value with a preset value and controlling the second on-off switch or the second on-off switch according to a second comparison result.
6. 6. The vacuum degree holding apparatus according to claim 5, wherein the first on-off switch is a first air-operated valve, the second on-off switch is a second air-operated valve, the vacuum degree holding apparatus further comprises a second air source interface, and a first electromagnetic valve and a second electromagnetic valve which are arranged in the thermal insulation cabinet, the second air source interface is arranged on the thermal insulation cabinet and exposed out of the thermal insulation cabinet, control ends of the first air-operated valve and the second air-operated valve are connected with the second air source interface, the first electromagnetic valve is arranged on a connecting pipe of the control ends of the first air-operated valve and the second air source interface to switch on or off air supply of the first air-operated valve, the second electromagnetic valve is arranged on a connecting pipe of the control ends of the second air-operated valve and the second air source interface to switch on or off air supply of the second air-operated valve, and control ends of the first electromagnetic valve and the second electromagnetic valve are connected with the control unit.
7. 7. The vacuum level holding apparatus of claim 4, further comprising a first filter reducer disposed within the thermal cabinet, the first filter reducer being disposed on a connection line between the first air source interface and a control end of the temperature control valve.
8. 8. The vacuum level holding apparatus of claim 6, further comprising a second filter reducer disposed within the thermal cabinet, the second filter reducer being disposed on the first solenoid valve and on the connection lines of the second solenoid valve to the first air source.
9. 9. The vacuum level holding apparatus according to claim 5, further comprising a human-machine interface connected to the control unit, wherein a manual trigger button is provided on the human-machine interface, and the manual trigger button can be clicked to trigger on or off of the first on-off switch, the second on-off switch, and the vacuum pump.
10. 10. The vacuum level holding apparatus according to claim 6, further comprising a first ball valve provided on a connection line of the first vacuum port and the first sampling probe, and a second ball valve provided on a connection line of the second vacuum port and the second sampling probe.

Description

Vacuum degree maintaining device Technical Field The utility model relates to the technical field of liquefied natural gas sampling, in particular to a vacuum degree maintaining device. Background During the reception, storage and transportation of Liquefied Natural Gas (LNG), accurate sampling analysis is critical to trade metering, quality control and safe operation, such as sampling analysis of LNG transported by ships. In order to prevent the sample from gasifying in advance, the supercooling degree of the liquefied natural gas sampling link needs to be kept, namely, the inside of the liquefied natural gas sampling probe is kept in a vacuum environment. At present, the method for keeping the vacuum environment inside the sampling probe is to manually vacuumize the sampling probe for liquefied natural gas. However, the method cannot maintain the vacuum degree in the sampling probe in real time, which easily causes problems of sealing due to too low vacuum degree in the liquefied natural gas sampling process, so that the sampled sample is partially gasified, the sample representativeness is seriously affected, and serious errors of trade metering results are caused. Therefore, the reliability of the existing liquefied natural gas sampling probe in a manner of maintaining a vacuum environment is low. Disclosure of utility model The technical problem to be solved by the embodiment of the utility model is to provide a vacuum degree maintaining device to solve the problem of lower reliability of a mode of maintaining a vacuum environment in a liquefied natural gas sampling probe in the prior art. The utility model discloses a vacuum degree maintaining device, which comprises a first vacuumizing port, a first on-off switch, a first pressure monitoring unit, a control unit and a vacuum pump, wherein, The first vacuumizing port is used for being connected with a first sampling probe capable of collecting liquefied natural gas from the outside; The vacuum pump is connected with the first vacuumizing port; The first on-off switch and the first pressure monitoring unit are both arranged on a connecting pipeline of the first vacuumizing port and the vacuum pump, the first pressure monitoring unit is positioned between the first vacuumizing port and the first on-off switch, and the first pressure monitoring unit is used for monitoring a first pressure value in the first sampling probe in real time and transmitting the first pressure value to the control unit; The control unit is connected with the first on-off switch and the vacuum pump, and is used for comparing a first pressure value with a preset value and controlling the on-off switch and the vacuum pump to be turned on or off according to a first comparison result. Optionally, the vacuum degree holding device further comprises a heat preservation cabinet, the first on-off switch, the first pressure monitoring unit and the vacuum pump are all arranged in the heat preservation cabinet, the first vacuumizing port is arranged on the heat preservation cabinet and exposed out of the heat preservation cabinet, and an exhaust port connected with the vacuum pump is arranged on the heat preservation cabinet. Optionally, the vacuum degree holding device further comprises a cooler arranged on the heat preservation cabinet and a heater arranged in the heat preservation cabinet, wherein the cooler is used for reducing the temperature in the heat preservation cabinet when the temperature in the heat preservation cabinet is higher than a first preset temperature value, and the heater is used for lifting the temperature in the heat preservation cabinet when the temperature in the heat preservation cabinet is lower than a second preset temperature value. Optionally, the vacuum degree holding device further includes a temperature control valve and a first air source interface, the temperature control valve is connected with the cooler, the first air source interface is connected with a control end of the temperature control valve, the temperature control valve is arranged in the heat insulation cabinet, and the first air source interface is arranged on the heat insulation cabinet and is exposed out of the heat insulation cabinet. Optionally, the vacuum degree holding device further includes a second vacuumizing port, a second pressure monitoring unit and a second on-off switch, wherein the second pressure monitoring unit and the second on-off switch are arranged in the heat insulation cabinet, the second vacuumizing port is arranged on the heat insulation cabinet and exposed out of the heat insulation cabinet, the second vacuumizing port is used for being connected with a second sampling probe capable of collecting liquefied natural gas from the outside, the vacuum pump is further connected with the second vacuumizing port, the second on-off switch and the second pressure monitoring unit are both arranged on a connecting pipeline of the second vacuumizing port and the vacuum pump,