Safe liquefied gas supply system assembly

Abstract

The invention relates to the field of control systems. A safe liquefied gas supply system assembly comprises a gas pipeline, a gas leakage detection alarm and a gas supply cabinet, and a liquefied gas steel cylinder is placed in the gas supply cabinet. The liquefied gas steel cylinder is connected with a gas conveying pipe, the gas conveying pipe is connected with one port of a three-way valve, the other port of the three-way valve is connected with a gas supplementing pipe, the gas supplementing pipe is provided with a first control valve, and the other port of the three-way valve is communicated with a fuel gas pipeline through a gas outlet pipe; the system further comprises a detection mechanism, the control terminal calculates the residual gas amount in the liquefied gas steel cylinder according to detection data obtained by the detection mechanism, and when the residual gas amount is lower than a threshold value, the control terminal controls the first control valve to be opened to automatically supplement gas, or the control terminal sends a gas supplement notification to a user side or a gas supply station side.

Description

Technical Field

[0001] The present invention relates to the field of control systems, in particular to a gas replenishment control system. Background Art

[0002] When replacing liquefied gas cylinders, the customer's pipes need to be unplugged and plugged, which can easily cause gas leaks and may even leave the customer with a temporary lack of gas. Summary of the Invention

[0003] An object of the present invention is to provide a liquefied gas safety supply system assembly to solve at least one of the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] The liquefied gas safety gas supply system assembly includes a gas pipeline located indoors and a gas leak detection alarm located indoors. It is characterized in that it also includes a gas supply cabinet located outdoors, in which a liquefied gas cylinder is placed.

[0006] The gas supply pipeline includes a gas supply pipe connected to the liquefied gas cylinder, the gas supply pipe is connected to one port of the three-way valve, the other port of the three-way valve is connected to the gas supply pipe, a first control valve is provided on the gas supply pipe, the other port of the three-way valve is connected to the gas pipeline through the gas outlet pipe, and the control terminal controls the connection to the first control valve;

[0007] It also includes a detection mechanism for detecting the remaining gas volume in the liquefied gas cylinder. The detection mechanism is communicatively connected to the control terminal. The control terminal calculates the remaining gas volume in the liquefied gas cylinder based on the detection data obtained by the detection mechanism. When the remaining gas volume is lower than the threshold, the control terminal controls the first control valve to open to automatically replenish gas, or the control terminal sends a gas replenishment notification to the user end or the gas supply station end.

[0008] Preferably, a second control valve is provided on the gas outlet pipe, and the control terminal controls the connection of the second control valve; the gas leak detection alarm is communicatively connected to the control terminal, and when a gas leak is detected, the control terminal controls the second control valve to close, thereby cutting off the gas.

[0009] Preferably, the detection mechanism includes a barometer, which reports the detected air pressure data to the control terminal, and the control terminal calculates the parameters of the remaining gas volume of the liquefied gas cylinder based on the air pressure data.

[0010] Preferably, the detection mechanism includes a lever-type air pressure detection device, which includes a first cavity, a piston, an extrusion rod, a shell, a rotating shaft, a lever, a pressure sensor, and a strain gauge. The liquefied gas cylinder is connected to the first cavity, and a piston is movably engaged inside the first cavity. The extrusion rod is fixedly provided on the upper end of the piston, and a shell is fixedly provided on the upper end of the first cavity. A rotating shaft is provided on one side of the shell, and a lever is fixed on the surface of the rotating shaft. A pressure sensor is fixed on one side of the shell, and a strain gauge is fixed on the upper end of the pressure sensor. The pressure sensor is communicatively connected to the control terminal, and the pressure sensor reports the detected air pressure data to the control terminal. The control terminal calculates the parameters of the remaining gas volume in the liquefied gas cylinder based on the air pressure data.

[0011] Preferably, the detection mechanism includes a temperature detection device for detecting the ambient temperature, the temperature detection device is fixed on the gas supply cabinet, the temperature detection device is communicatively connected to the control terminal, the temperature detection device reports the detected temperature data to the control terminal, and the control terminal comprehensively calculates the parameters of the remaining gas volume in the liquefied gas cylinder based on the air pressure data and temperature data.

[0012] Preferably, the gas supply pipe is connected to a liquefied gas supply pipeline or another liquefied gas cylinder.

[0013] Preferably, the liquefied gas cylinder connected to the gas transmission pipe is used as the first liquefied gas cylinder, and the liquefied gas cylinder connected to the gas supply pipe is used as the second liquefied gas cylinder. The first liquefied gas cylinder and the second liquefied gas cylinder are both provided with the detection mechanism. The control terminal calculates the remaining gas volume of the second liquefied gas cylinder. When the remaining gas volume is lower than the threshold, the control terminal sends a bottle replacement notification to the user end or the gas supply station end.

[0014] Preferably, a second flow meter is provided on the gas pipeline, the second flow meter is communicatively connected to the control terminal, the second flow meter reports the gas usage flow data to the control terminal, and the control terminal uses the gas usage flow data as calibration data when calculating the remaining gas volume in the liquefied gas cylinder.

[0015] Preferably, a first flow meter is provided on the gas supply pipe, and the first flow meter is communicatively connected to the control terminal. The first flow meter reports the gas supply flow data to the control terminal, and the control terminal uses the gas supply flow data as calibration data when calculating the remaining gas volume in the liquefied gas cylinder.

[0016] Preferably, the control terminal records the opening time of the first control valve, and uses the opening time as calibration data for calculating the remaining gas volume in the liquefied gas cylinder.

[0017] Preferably, the detection mechanism includes a magnetic float and an electromagnetic switch system. The magnetic float includes an airbag and a permanent magnet fixed in the middle below the airbag. The airbag and the permanent magnet both adopt a circular structure in the horizontal direction. The radius of the airbag in the horizontal direction is more than 5 times the radius of the permanent magnet. A non-magnetic counterweight is also provided below the airbag to adjust the center of gravity of the magnetic float to the bottom of the overall structure, lower than one-fifth of the overall height. The magnetic float is inserted into the liquefied gas cylinder through the gas outlet of the liquefied gas cylinder, and the radius ratio and the counterweight mass are set to avoid The permanent magnet is prevented from being adsorbed to the side wall of the liquefied gas cylinder; the relationship between the volume of the airbag and the magnetic force of the permanent magnet is that the buoyancy of the airbag in the liquid liquefied gas is greater than the suction force of the permanent magnet on the bottom of the liquefied gas cylinder; thereby, the permanent magnet follows the amount of liquid and liquefied gas in the liquefied gas cylinder and is attracted to and separated from the bottom of the liquefied gas cylinder; the electromagnetic switch system includes a switch circuit system, and the sensor interface of the switch circuit system is connected in parallel to at least five Hall sensors; the at least five Hall sensors are distributed below the bottom of the liquefied gas cylinder, and the switch circuit system is communicatively connected to the control terminal.

[0018] Beneficial effects: 1. The liquefied gas cylinder of the present invention is automatically replenished. When in use, there is no need to unplug the indoor gas pipeline, so there is no problem of gas leakage caused by plugging the gas pipeline. 2. The present invention can automatically send a bottle change notification to the gas supply station, and when the bottle is changed, the liquefied gas cylinder connected to the gas pipeline can be used normally, so there is no situation where the customer is temporarily out of gas. 3. The liquefied gas cylinder of the present invention is located outdoors, the gas stove is located indoors, and a gas leak detection device is also provided indoors, which can effectively improve the safety of gas use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic structural diagram of a structure of the present invention;

[0020] Figure 2 A schematic structural diagram of another structure of the present invention;

[0021] Figure 3 It is a structural diagram of a lever-type air pressure detection device.

[0022] In the figure: 1. Liquefied gas cylinder; 2. Gas transmission pipe; 3. First control valve; 4. Second control valve; 5. Three-way valve; 6. Pressure gauge; 7. Lever-type air pressure detection device; 8. Pressure sensor; 9. Temperature detection device; 71. Strain gauge; 72. Rubber diaphragm; 73. Second cavity; 74. First cavity; 75. Piston; 76. Extrusion rod; 77. Housing; 78. Rotating shaft; 79. Lever. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] Reference Figure 1 and Figure 2 The liquefied gas safety supply system assembly includes a gas pipeline located indoors and a gas leak detection alarm located indoors. It also includes a gas supply cabinet located outdoors, in which a liquefied gas cylinder 1 is placed. It also includes a gas supply pipeline, which includes a gas pipe 2 connected to the liquefied gas cylinder 1, the gas pipe 2 is connected to one port of a three-way valve 5, the other port of the three-way valve 5 is connected to a gas supply pipe, a first control valve 3 is provided on the gas supply pipe, the other port of the three-way valve 5 is connected to the gas pipeline through an outlet pipe, and the control terminal controls the connection to the first control valve 3. It also includes a detection mechanism for detecting the remaining gas volume in the liquefied gas cylinder, the detection mechanism is communicatively connected to the control terminal, and the control terminal calculates the remaining gas volume in the liquefied gas cylinder based on the detection data obtained by the detection mechanism. When the remaining gas volume is lower than a threshold, the control terminal controls the first control valve 3 to open to automatically replenish gas, or the control terminal sends a gas replenishment notification to the user end or the gas supply station end.

[0025] A second control valve 4 is provided on the gas outlet pipe, and the control terminal controls the connection to the second control valve 4; the gas leak detection alarm is communicated with the control terminal, and when a gas leak is detected, the control terminal controls the second control valve 4 to close, thereby cutting off the gas.

[0026] The detection mechanism includes a barometer 6, which reports the detected air pressure data to the control terminal, and the control terminal calculates the parameters of the remaining gas volume of the liquefied gas cylinder based on the air pressure data. Figure 3As shown, the lever-type air pressure detection device 7 includes a first cavity 74, a piston 75, an extrusion rod 76, a housing 77, a rotating shaft 78, a lever 79, a pressure sensor 8, and a strain gauge 71. The liquefied gas cylinder is connected to the first cavity. A piston is movably engaged within the first cavity, with an extrusion rod fixedly mounted on its upper end. The housing is fixedly mounted on the upper end of the first cavity. A rotating shaft is disposed on one side of the housing, with a lever fixedly mounted on its surface. A pressure sensor is fixedly mounted on one side of the housing, with a strain gauge fixedly mounted on its upper end. The pressure sensor is communicatively connected to a control terminal and reports detected air pressure data to the control terminal, which calculates the remaining air volume in the liquefied gas cylinder based on the air pressure data. A rubber diaphragm 72 is fixedly mounted within the first cavity at the lower end of the piston. This rubber diaphragm further improves the sealing of the piston to prevent leakage. The greater the amount of air remaining in the liquefied gas cylinder, the greater the air pressure. Therefore, the present invention can determine the remaining air volume by detecting changes in air pressure. The method for the control terminal to calculate the remaining gas volume of the liquefied gas cylinder based on the air pressure data: the remaining gas volume corresponding to different air pressures can be stored in the database as the first associated data, and the control terminal calls the remaining gas volume corresponding to the current air pressure in the database as the remaining gas volume of the liquefied gas cylinder. The database can be located on the control terminal, on the user terminal, or on the gas supply station terminal, as long as the control terminal can access it. The remaining gas volume corresponding to different air pressures can be obtained by detection by power supply station personnel or special inspection personnel. It is also possible to generate a function formula based on the remaining gas volume corresponding to different air pressures, and the control terminal calls the function formula to calculate the remaining gas volume. It is also possible to store only the air pressure corresponding to the remaining gas volume threshold in the control terminal, and the control terminal compares the detected air pressure with the stored air pressure. When the air pressure is less than the air pressure corresponding to the remaining gas volume threshold, it is considered that the remaining gas volume of the liquefied gas cylinder is low and needs to be replenished.

[0027] The detection mechanism includes a temperature detection device for detecting ambient temperature. The temperature detection device is fixed to the gas supply cabinet and is connected to the control terminal. The temperature detection device reports the detected temperature data to the control terminal, which then calculates the remaining gas volume in the liquefied gas cylinder based on the pressure and temperature data. Temperature changes will cause the value of the pressure detection device to change, so detecting temperature data helps improve the accuracy of the calculation of the remaining gas volume in the liquefied gas cylinder. In an isovolumetric environment, the gas pressure is proportional to the ambient temperature. According to the ideal gas state equation PV=nRT, when the volume V and the amount of substance n are constant, the pressure P is proportional to the temperature T (it should be noted that the temperature here should be the thermodynamic temperature, in Kelvin K). When the pressure detection device 10 detects the pressure inside the liquefied gas cylinder 11, assuming that the initial temperature T1=35°C=308.15K and the initial pressure P1=1 (assuming the unit is standard atmospheric pressure or any unit), the final temperature T2=34°C=307.15K changes with the ambient temperature. According to the ideal gas law, the relationship between pressure and temperature is: T2P1=T1P2. It can be concluded that the measured pressure at this time should be approximately equal to 0.997. In this way, the temperature detection device can be used to make detection corrections for the pressure detection device to prevent false alarms caused by temperature drops. If the pressure detection device detects that the gas pressure change inside the liquefied gas cylinder 1 does not follow a direct proportional change as the temperature changes, an alarm is issued. Yes, a second cavity 73 is provided on one side of the first cavity 74, and a temperature detection device 9 is provided at the lower end of the second cavity 73. The remaining gas volume corresponding to different temperatures and different air pressures can be stored in a database as first associated data, and the control terminal calls the remaining gas volume corresponding to the current air pressure in the database as the remaining gas volume of the liquefied gas cylinder. The database can be located on the control terminal, on the user terminal, or on the gas supply station terminal, as long as the control terminal can call it. The remaining gas volume corresponding to different air pressures can be detected and obtained by power supply station personnel or special detection personnel. Alternatively, the air pressure at different temperatures corresponding to the remaining gas volume threshold can be stored in the control terminal, and the control terminal compares the detected air pressure with the air pressure corresponding to the remaining gas volume threshold at the temperature corresponding to the detected temperature. When the air pressure is less than the air pressure corresponding to the remaining gas volume threshold, it is considered that the remaining gas volume of the liquefied gas cylinder is low and needs to be refilled. The control terminal records the number of bottle changes, so as to calculate the customer's fee at the end of the payment cycle.

[0028] The gas supply pipe is connected to the liquefied gas supply pipeline or another liquefied gas cylinder. The liquefied gas cylinder connected to the gas supply pipe 2 is used as the first liquefied gas cylinder, and the liquefied gas cylinder connected to the gas supply pipe is used as the second liquefied gas cylinder. The first liquefied gas cylinder and the second liquefied gas cylinder are both provided with detection mechanisms. The control terminal calculates the remaining gas volume of the second liquefied gas cylinder. When the remaining gas volume is lower than the threshold, the control terminal sends a bottle replacement notification to the user end or the gas supply station end. After receiving the bottle replacement notification, the gas supply station end brings the full liquefied gas cylinder to the user end to replace the second liquefied gas cylinder that has been consumed. In order to ensure that the gas in the second liquefied gas cylinder is consumed as much as possible, and at the same time, to avoid the second liquefied gas cylinder being unable to transport gas to the first liquefied gas cylinder when the gas pressure of the first liquefied gas cylinder is greater than that of the second liquefied gas cylinder, an air pump or a one-way valve can be added to the gas supply pipe. When changing gas, station staff can modify the data on the control terminal to make the remaining gas calculation more accurate. This may vary depending on the different liquefied gas cylinders used and the liquefied gas contained within. There can be more than one primary and secondary liquefied gas cylinder in the same gas supply cabinet.

[0029] A first flowmeter is provided on the gas supply pipe, which is communicatively connected to the control terminal. The first flowmeter reports gas supply flow data to the control terminal, which uses the gas supply flow data as calibration data for calculating the remaining gas volume in the liquefied gas cylinder. A second flowmeter is provided on the gas pipeline, which is communicatively connected to the control terminal. The second flowmeter reports gas usage flow data to the control terminal, which uses the gas usage flow data as calibration data for calculating the remaining gas volume in the liquefied gas cylinder. The control terminal subtracts the gas usage flow data from the gas supply flow data and adds the remaining gas volume in the liquefied gas cylinder before gas replenishment to obtain the measured value of the current remaining gas volume in the liquefied gas cylinder. The control terminal can compare the measured value with the calculated value above to determine the accuracy of the calculated value and adjust the parameters during the calculation. This patent does not use the actual value as the judgment value, mainly because: 1. The actual value requires the installation of an additional flowmeter, which is costly. 2. The actual value has errors because the remaining gas volume in the liquefied gas cylinder before gas replenishment is calculated. 3. The calculated value can already estimate the remaining gas volume in the liquefied gas cylinder, so there is no need to set up any other devices.

[0030] Alternatively, the detection mechanism may include a magnetic float and an electromagnetic switch system. The magnetic float includes an airbag and a permanent magnet fixed in the middle below the airbag. Both the airbag and the permanent magnet are horizontally circular, with the airbag's radius being at least five times greater than the radius of the permanent magnet. A non-magnetic counterweight is also provided below the airbag to adjust the center of gravity of the magnetic float to the bottom of the overall structure, below one-fifth of the overall height. The magnetic float is inserted into the liquefied gas cylinder through the cylinder's gas outlet. The radius ratio and the counterweight mass are set to prevent the permanent magnet from adsorbing to the side wall of the liquefied gas cylinder. The relationship between the volume of the airbag and the magnetic force of the permanent magnet is such that the buoyancy of the airbag in the liquid liquefied gas is greater than the attraction of the permanent magnet on the bottom of the liquefied gas cylinder. This allows the permanent magnet to engage and disengage with the bottom of the liquefied gas cylinder in response to the amount of liquid and liquefied gas in the cylinder. The electromagnetic switch system includes a switch circuit system, wherein the sensor interface of the switch circuit system is connected in parallel to at least five Hall sensors. The at least five Hall sensors are distributed below the bottom of the liquefied gas cylinder. The switch circuit system is communicatively connected to the control terminal. The switch circuit system can adopt a switch circuit with an integrated operational amplifier structure. The switch circuit system driven by the Hall sensor is a circuit system commonly used by those skilled in the art. When there is a large amount of liquid liquefied gas in the liquefied gas cylinder, the magnetic float is subjected to a large buoyancy, floats up, and moves away from the Hall sensor, and the switch circuit system does not work. When there is a small amount of liquid liquefied gas in the liquefied gas cylinder, the magnetic float is subjected to a small buoyancy, sinks to the bottom of the liquefied gas cylinder, and the permanent magnet approaches the Hall sensor, and the switch circuit system starts working and sends a signal to the control terminal. The above design does not require modification or replacement of the liquefied gas cylinder, and is simple to use, low cost, reliable in performance, long in service life, and has a measurement accuracy far higher than the traditional air pressure method.

[0031] The traditional system of judging the remaining amount of liquefied gas by air pressure is an indirect measurement method. It is affected by temperature, liquefied gas quality, exhaust speed, and even the local atmospheric pressure, making it difficult to measure accurately. The above method is a direct measurement method that is not affected by these systems and can better help maintain the stability of the gas supply. In the present invention, by setting an airbag with a larger radius, the position of the permanent magnet at the bottom of the bottle is limited to a smaller position in the middle, which makes it easier to simply configure the Hall sensor arrangement structure.

[0032] Traditionally, liquefied gas cylinders are closed, magnetically conductive steel structures that are difficult for magnetic forces to penetrate. However, the inventors discovered that liquefied gas cylinders are tall and have a large radius. The magnetic flux lines of a small permanent magnet at the bottom of the cylinder form a closed magnetic circuit with high magnetic resistance, allowing sufficient magnetic flux lines to leak upward from the bottom of the cylinder. This leakage of magnetic force is sufficient to drive a nearby Hall effect sensor.

[0033] The airbag has a self-closing inflation port. An inflation tube is connected to the port, and when the tube is removed, the port automatically closes, forming an airtight structure. The magnetic float is installed in the liquefied gas cylinder by connecting the uninflated airbag to the inflation tube, inserting it into the liquefied gas cylinder, and then inflating it through the inflation tube. After inflation, the inflation tube is removed, leaving the inflated magnetic float in the liquefied gas cylinder. Furthermore, the connection between the inflation port and the inflation tube is a pop-up connection. When sufficient air is introduced into the inflation port, the inflation tube pops out, and the inflation port automatically closes. This structure avoids unreliable human perception in the absence of visual feedback. The gas filled in the airbag is preferably nitrogen. Preferably, the airbag is made of foam rubber.

[0034] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0035] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A liquefied gas safety supply system assembly, comprising a gas pipeline located indoors and a gas leak detection alarm located indoors, characterized in that: Also included is a gas supply cabinet located outdoors, wherein a liquefied gas cylinder is placed in the gas supply cabinet; The gas supply pipeline includes a gas supply pipe connected to the liquefied gas cylinder, the gas supply pipe is connected to one port of the three-way valve, the other port of the three-way valve is connected to the gas supply pipe, a first control valve is provided on the gas supply pipe, the other port of the three-way valve is connected to the gas pipeline through the gas outlet pipe, and the control terminal controls the connection to the first control valve; It also includes a detection mechanism for detecting the remaining gas volume in the liquefied gas cylinder. The detection mechanism is communicatively connected to the control terminal. The control terminal calculates the remaining gas volume in the liquefied gas cylinder based on the detection data obtained by the detection mechanism. When the remaining gas volume is lower than the threshold, the control terminal controls the first control valve to open to automatically replenish gas, or the control terminal sends a gas replenishment notification to the user end or the gas supply station end.

2. The liquefied gas safety supply system assembly according to claim 1, characterized in that: The detection mechanism includes a barometer, which reports the detected air pressure data to the control terminal, and the control terminal calculates the parameters of the remaining gas volume in the liquefied gas cylinder based on the air pressure data.

3. The liquefied gas safety supply system assembly according to claim 1, characterized in that: The detection mechanism includes a lever-type air pressure detection device, which includes a first cavity, a piston, an extrusion rod, a shell, a rotating shaft, a lever, a pressure sensor, and a strain gauge. The liquefied gas cylinder is connected to the first cavity. A piston is movably engaged inside the first cavity, an extrusion rod is fixedly provided on the upper end of the piston, a shell is fixedly provided on the upper end of the first cavity, a rotating shaft is provided on one side of the shell, a lever is fixedly provided on the surface of the rotating shaft, a pressure sensor is fixedly provided on one side of the shell, a strain gauge is fixedly provided on the upper end of the pressure sensor, and the pressure sensor is communicatively connected to the control terminal. The pressure sensor reports the detected air pressure data to the control terminal, and the control terminal calculates the parameters of the remaining gas volume of the liquefied gas cylinder based on the air pressure data.

4. The liquefied gas safety supply system assembly according to claim 2 or 3, characterized in that: The detection mechanism includes a temperature detection device for detecting the ambient temperature. The temperature detection device is fixed on the gas supply cabinet. The temperature detection device is communicatively connected to the control terminal. The temperature detection device reports the detected temperature data to the control terminal. The control terminal comprehensively calculates the parameters of the remaining gas volume in the liquefied gas cylinder based on the air pressure data and temperature data.

5. The liquefied gas safety supply system assembly according to any one of claims 1 to 3, characterized in that: The gas supply pipe is connected to a liquefied gas supply pipeline or another liquefied gas cylinder.

6. The liquefied gas safety supply system assembly according to claim 5, characterized in that: The liquefied gas cylinder connected to the gas transmission pipe is used as the first liquefied gas cylinder, and the liquefied gas cylinder connected to the gas supply pipe is used as the second liquefied gas cylinder. The first liquefied gas cylinder and the second liquefied gas cylinder are both provided with the detection mechanism. The control terminal calculates the remaining gas volume of the second liquefied gas cylinder. When the remaining gas volume is lower than the threshold, the control terminal sends a bottle replacement notification to the user end or the gas supply station end.

7. The liquefied gas safety supply system assembly according to any one of claims 1 to 3, characterized in that: A second flow meter is provided on the gas pipeline, and the second flow meter is communicatively connected to the control terminal. The second flow meter reports the gas usage flow data to the control terminal, and the control terminal uses the gas usage flow data as calibration data when calculating the remaining gas volume in the liquefied gas cylinder.

8. The liquefied gas safety supply system assembly according to any one of claims 1 to 3, characterized in that: A first flow meter is provided on the gas supply pipe, and the first flow meter is communicatively connected to the control terminal. The first flow meter reports the gas supply flow data to the control terminal, and the control terminal uses the gas supply flow data as calibration data for calculating the remaining gas volume in the liquefied gas cylinder.

9. The liquefied gas safety supply system assembly according to any one of claims 1 to 3, characterized in that: The control terminal records the opening time of the first control valve and uses the opening time as calibration data for calculating the remaining gas volume in the liquefied gas cylinder.

10. The liquefied gas safety supply system assembly according to any one of claims 1 to 3, characterized in that: The detection mechanism includes a magnetic float and an electromagnetic switch system. The magnetic float includes an airbag and a permanent magnet fixed in the middle below the airbag. The airbag and the permanent magnet both adopt a circular structure in the horizontal direction. The radius of the airbag in the horizontal direction is more than 5 times the radius of the permanent magnet. A non-magnetic counterweight is also provided below the airbag to adjust the center of gravity of the magnetic float to the bottom of the overall structure, lower than one-fifth of the overall height. The magnetic float is inserted into the liquefied gas cylinder through the gas outlet of the liquefied gas cylinder. By setting the radius ratio and the mass of the counterweight, the magnetic float is prevented from The permanent magnet is adsorbed onto the side wall of the liquefied gas cylinder; the relationship between the volume of the airbag and the magnetic force of the permanent magnet is that the buoyancy of the airbag in the liquid liquefied gas is greater than the suction force of the permanent magnet on the bottom of the liquefied gas cylinder; thereby, the permanent magnet follows the amount of liquid and liquefied gas in the liquefied gas cylinder, and is attracted to and separated from the bottom of the liquefied gas cylinder; the electromagnetic switch system includes a switch circuit system, and the sensor interface of the switch circuit system is connected in parallel to at least five Hall sensors; the at least five Hall sensors are distributed below the bottom of the liquefied gas cylinder, and the switch circuit system is communicatively connected to the control terminal.

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