Family life gas system

Abstract

The invention relates to a family life gas system, which adopts an intelligent gas meter, low-high pressure opening and closing, gas storage of a buffer gas tank and inert gas monitoring technologies, effectively improves the metering accuracy and stability of the family life gas meter, monitors the family life gas quality, and is high in universality and high in reliability. The system can be effectively used for newly building a family life gas system and transforming a traditional family life gas system, for gas companies and users, the technical scheme can achieve win-win, and the social and economic significance is huge.

Description

Technical Field

[0001] The present invention relates to the technical field of domestic gas, and in particular to a domestic gas system using a low-pressure on-off valve and a buffer gas tank. Background Art

[0002] The popularization of household gas is of great significance. It not only improves the quality of life of residents, but also has a positive impact on environmental protection, economic development and energy security.

[0003] However, in the process of popularizing gas, a problem that needs to be solved has also arisen. That is, when the gas is used at low flow or low fire, the sensitivity of the gas meter is not enough, and the gas meter basically does not move, which will cause the so-called "gas theft" problem. The gas company took this as an excuse to take the initiative to replace the new smart gas meter with a higher accuracy.

[0004] There are many possible reasons for the surge in gas prices, as analyzed below: 1. Gas meter design issues: When the flow rate is small, the gas meter is too sensitive. Slight pressure fluctuations of the airflow may cause the meter reading to be distorted. However, by using mechanical transmission, such as the principle of wave power generation, it is possible to design a gas meter that can rotate and count regardless of positive or negative fluctuations. Therefore, false readings will inevitably occur, increasing the gas cost of users and bringing new unfairness. 2. Gas company issues: Some gas companies may intentionally or unintentionally mix inert gases, such as nitrogen or carbon dioxide, into the gas for profit, resulting in a decrease in the actual calorific value of the gas per unit volume. However, the price of the gas per unit volume remains unchanged, and the gas usage increases accordingly to meet the needs of family life. Under the premise that other conditions remain unchanged, the use of low-quality gas will inevitably lead to an increase in gas costs; 3. Gas source problem: The calorific value of the gas source supplied to the gas company decreases, which is eventually passed on to households, resulting in an increase in household gas bills; 4. If there is a gas pipeline leak or gas theft, the gas company will include this loss in the gas cost, and the price increase will cause an increase in gas costs; 5. Inherent problems of gas metering instruments: The metering instruments have inherent defects, that is, when the flow rate is low, the metering error caused by the metering accuracy is bound to be large.

[0005] In addition, when the gas company's pipeline is under maintenance, gas will be cut off in designated areas and time periods, which will inevitably affect the normal lives of residents in the corresponding areas.

[0006] The household gas system, such as household gas meters, profit-driven issues and gas fees, involves thousands of households. If not given enough attention, once something goes wrong, the social repercussions will be great, which will inevitably have a negative impact on social fairness and credibility. The harm cannot be underestimated.

[0007] Compared with smart gas meters, the disadvantages of traditional old-fashioned gas meters mainly include the following points: 1. Low efficiency of manual meter reading: Old-style gas meters require manual meter reading regularly, which is labor-intensive and prone to meter reading errors. This method is inefficient and greatly affected by objective factors. Meter readers cannot read meters regularly according to the prescribed time, and meter reading dates are often advanced or postponed; 2. Lack of real-time feedback: Old-style gas meters cannot provide real-time gas usage data. Users need to wait for the meter reader to read the meter to know the gas usage, which makes it impossible for users to understand their gas usage in time and manage gas usage reasonably. 3. High maintenance cost: Due to its mechanical properties, the old gas meter is more prone to wear and corrosion, resulting in metering errors and high maintenance costs; 4. Easy to be used to evade payment: The pointer of the old-fashioned gas meter basically does not move when the fire is low or low, and some users will take advantage of this to evade payment; 5. Backward technology: With the development of science and technology, people have higher and higher requirements for the accuracy and convenience of measurement. The old gas meters cannot meet these requirements. Smart gas meters will realize remote meter reading to households, real-time monitoring of pipe networks, and intelligent analysis of business operations through the smart meter reading platform, thus improving meter reading efficiency. 6. Unable to achieve intelligent management: Old-fashioned gas meters cannot achieve remote data transmission, including data collection, storage, transmission and other steps, and cannot completely get rid of the troubles of traditional gas meters in the past.

[0008] In summary, the old-fashioned gas meters have obvious disadvantages in terms of efficiency, accuracy, real-time performance, maintenance costs, and intelligent management, while smart gas meters have significant advantages in these aspects. Therefore, it is an inevitable trend for smart gas meters to replace old-fashioned gas meters. The data analysis function of smart gas meters has the following advantages: 1. Gas usage behavior characteristics and habits: By analyzing the data collected by smart gas meters, we can obtain the user's gas usage behavior characteristics and habits, and understand the user's gas usage pattern and preferences; 2. Gas usage measurement: Smart gas meters can provide accurate gas usage measurement, helping gas companies and users understand the specific gas usage; 3. Detection of abnormal gas usage behavior: Data analysis can help detect abnormal gas usage behaviors, such as gas leaks or gas theft, and conduct timely maintenance and management; 4. Resource conservation: By analyzing the gas usage data of users, gas companies can discover the wasteful gas usage of users and take targeted measures to remind users to save gas; 5. Improved service quality: Data analysis of smart gas meters can help gas companies improve service quality. By analyzing gas usage data, they can predict users’ gas demand and take corresponding measures to ensure gas supply. 6. Gas demand prediction: Smart gas meters analyze users’ historical gas usage data and gas usage habits, and use algorithm models to predict users’ gas demand, helping gas companies adjust gas supply plans; 7. Gas usage optimization: The analysis and mining of smart gas meter data can be used to optimize gas usage, helping users and gas companies to use gas resources more rationally; 8. Solar energy reminder: When the user's gas consumption exceeds a certain threshold, the smart gas meter can issue a reminder to guide the user to save gas; 9. Data reporting: Smart gas meters can regularly send reports on gas usage and frequency to users, making them aware of their gas usage behavior and providing suggestions to help them reduce gas usage.

[0009] These data analysis functions make the smart gas meter more than just a metering tool, but an intelligent system that can provide in-depth gas usage insights and optimization suggestions.

[0010] In response to the above problems, it is worthy of in-depth study how to use technical means to solve the stability of household gas systems, the accuracy of household gas metering, and the inconvenience caused by gas outages in household gas systems, reduce the total social operating costs, and enhance people's social happiness and satisfaction. Summary of the invention

[0011] The purpose of the present invention is to solve the above-mentioned problems and to provide a household gas system that adopts intelligent gas meters, low- and high-pressure start-stop valves, and buffer gas tank technology to effectively improve the metering accuracy and metering stability of the intelligent gas meters in the household gas system, thereby achieving the purpose of saving social public resources and improving people's quality of life and life satisfaction.

[0012] A household gas system, characterized in that: The household gas system is provided with a main gas supply pipe intelligent gas meter 30, a No. 1 user intelligent gas meter 40, a No. 1 user low and high pressure start-stop valve 41, a No. 1 user buffer gas tank 43, a No. 2 user intelligent gas meter 50, a No. 2 user low and high pressure start-stop valve 51, a No. 2 user buffer gas tank 53, a No. N user intelligent gas meter 60, a No. N user low and high pressure start-stop valve 61, a No. N user buffer gas tank 63, wherein N of the No. N users is greater than or equal to 3. The domestic gas enters the No. 1 user's smart gas meter 40, the No. 1 user's low and high pressure start-stop valve 41, the No. 1 user's buffer gas tank 43, the No. 1 gas facility 45, the No. 2 user's smart gas meter 50, the No. 2 user's low and high pressure start-stop valve 51, the No. 2 user's buffer gas tank 53, the No. 2 gas facility 55, or the No. N user's smart gas meter 60, the No. N user's low and high pressure start-stop valve 61, the No. N user's buffer gas tank 63, the No. N gas facility 65 through the main gas supply pipe 29 and the main gas supply pipe smart gas meter 30. When the No. 1 gas-using facility 45 is put into use, the No. 1 user buffer gas tank 43 supplies gas to the No. 1 gas-using facility 45. When the second gas-using facility 55 is put into use, the second user buffer gas tank 53 supplies gas to the second gas-using facility 55. When the Nth gas-using facility 65 is put into use, the Nth user buffer gas tank 63 supplies gas to the Nth gas-using facility 65. When the pressure in the buffer gas tank 43 of user No. 1 is at the set low pressure, the low and high pressure start-stop valve 41 of user No. 1 is opened; when the pressure in the buffer gas tank 43 of user No. 1 reaches the set high pressure, the low and high pressure start-stop valve 41 of user No. 1 is closed to stop gas supply. When the pressure in the buffer gas tank 53 of the second user is at the set low pressure, the low and high pressure start-stop valve 51 of the second user is opened; when the pressure in the buffer gas tank 53 of the second user reaches the set high pressure, the low and high pressure start-stop valve 51 of the second user is closed to stop gas supply. When the pressure in the buffer gas tank 63 of user N is at the set low pressure, the low and high pressure start-stop valve 61 of user N is opened; when the pressure in the buffer gas tank 63 of user N reaches the set high pressure, the low and high pressure start-stop valve 61 of user N is closed to stop gas supply. Since the above-mentioned low and high pressure start-stop valve can automatically and smoothly replenish gas to the buffer gas tank when the corresponding buffer gas tank is at low pressure, when the pressure in the buffer gas tank reaches the set high pressure, the low and high pressure start-stop valve is closed, and the entire gas replenishment process is continuous and smooth, thereby ensuring the stable and accurate metering of the smart gas meter; because when the gas facilities are put into use, it will cause pressure fluctuations and gas volume changes in domestic gas, but because it is supplied by buffer gas tanks, it will not affect the metering of the smart gas meters of users No. 1, No. 2 or No. N, thereby eliminating the influence of pressure and gas volume changes when traditional gas facilities are put into use on the metering accuracy of smart gas meters, and eliminating the influence of gas facilities on the gas supply system when they are put into use.

[0013] The main water supply pipe is equipped with a low-pressure start-stop valve 31 and a buffer tank 33: Domestic gas enters the buffer tank 33 through the main gas supply pipe 29, the main gas supply pipe intelligent gas meter 30, the main gas supply pipe low and high pressure start-stop valve 31, and the main air intake pipe 32, and then enters user No. 1, user No. 2 or user No. N.

[0014] The No. 1 gas-using facility 45 , the No. 2 gas-using facility 55 or the No. N gas-using facility 65 includes a gas stove, a gas water heater, and the like.

[0015] The main gas supply pipe 29, the No. 1 user gas intake pipeline 42, the No. 2 user gas intake pipeline 52, the No. N user gas intake pipeline 62 and the gas supply pipelines between the corresponding buffer gas tanks and the gas-using facilities include pipes, pipe fittings and their supporting parts.

[0016] The pipe fittings include elbows, tees, crosses, reducers, pipe caps, plugs, etc.

[0017] The connection between the pipes, the pipes and the pipe fittings, and the pipe fittings and the pipe fittings is achieved by welding, hot-melt connection, expansion connection, snap connection or threaded connection.

[0018] The gas-using facilities include gas water heaters, gas stoves, gas household hot water boilers, etc.

[0019] The low and high pressure on-off valve is started and stopped by mechanical, pneumatic or electric control.

[0020] An inert gas analyzer is provided: the inert gas analyzer is arranged between the low-pressure and high-pressure start-stop valves and the gas using facilities.

[0021] The inert gas analyzer is used to analyze the content of one or more gases, such as nitrogen, carbon dioxide or argon, in the fuel gas for judging the fuel gas quality.

[0022] The buffer tank 33 is provided with a safety valve 34, and an outlet pipe of the safety valve 34 is connected to a safe place.

[0023] The No. 1 user buffer gas tank 43 is provided with a No. 1 user safety valve 44 , and the outlet pipe of the No. 1 user safety valve 44 is connected to an outdoor safe place.

[0024] The No. 1 user buffer gas tank 43 is provided with a pressure gauge, and the pressure gauge is within the verification validity period.

[0025] The No. 2 user buffer gas tank 53 is provided with a No. 2 user safety valve 54 , and the outlet pipe of the No. 2 user safety valve 54 is connected to an outdoor safe place.

[0026] The No. 2 user buffer gas tank 53 is provided with a pressure gauge, and the pressure gauge is within the verification validity period.

[0027] The Nth user buffer gas tank 63 is provided with an Nth user safety valve 64, and the outlet pipe of the Nth user safety valve 64 is connected to an outdoor safe place.

[0028] The No. N user buffer gas tank 63 is provided with a pressure gauge, and the pressure gauge is within the verification validity period.

[0029] The household gas system is provided with a gas leakage detection instrument.

[0030] The household gas system is provided with a gas leakage alarm instrument.

[0031] The unspecified facilities in the domestic gas system are matched with reference to or in accordance with the reliable and mature technologies in the known domestic gas supply systems.

[0032] The unspecified facilities in the domestic gas system are matched with reference to or in accordance with the reliable and mature technologies in the known gas supply pipelines.

[0033] Compared with the prior art, the present invention has the following advantages: 1. Compared with the existing household gas system, the low-pressure on-off valve and buffer gas tank gas storage technology provided by the present invention are applied to the household gas system and have the following advantages: (1) It can ensure that the gas meter is within the optimal metering accuracy range, effectively avoiding the problem of large counting errors of the gas meter when the gas flow rate is small during traditional household gas use. The essential breakthrough of the present invention is to change the traditional synchronous gas use and metering into asynchronous gas use and metering, and accumulate intermittent metering of large flow rate, so that the metering of the smart gas meter is within the optimal range; (2) Avoid the so-called "gas theft" problem by users, facilitate users to monitor in real time and effectively whether the gas meter is in the counting state when not in use, eliminate the false rumors of gas companies' so-called remote control of meter readings, and help build a general sense of trust and security among the public; (3) When using gas for household life, it will cause fluctuations in gas pressure and changes in gas volume. However, since the gas is supplied by a buffer gas tank, it will not affect the measurement of the gas meter, thereby eliminating the influence of changes in gas pressure and gas volume on the measurement accuracy of the gas meter when the traditional household gas facilities are put into use, and eliminating the influence of the traditional household gas facilities on the gas supply system when they are put into use; however, the fluctuations in gas pressure and gas volume of household life lead to inaccurate measurement of user-side gas meters, increased gas costs for users, abnormal gas volume after the promotion of precision gas meters, and reports driven by departmental interests, which are often seen in newspapers and have a great social response, causing a negative impact on social fairness and credibility. The harm should not be underestimated. The technical solution of the present invention eliminates this disadvantage invisibly; (4) Due to the gas storage function of the buffer gas tank, when the gas supply department conducts gas pipeline maintenance and stops gas in a certain area and time period, it can select a suitable buffer gas tank whose storage volume can provide daily necessities without affecting the normal life of the family; (5) Since the smart gas meter on the main gas supply pipe and the smart gas meter on the user end can measure accurately with extremely small measurement errors, by comparing the smart gas meter on the main gas supply pipe with the smart gas meter on the user end, it is easy to find leaks or detect abnormal gas use such as gas theft, providing reliable technical support for the maintenance and operation management of the domestic gas system; 2. Compared with the prior art, the inert gas detector of the present invention helps users monitor gas quality and safeguard the legitimate interests of users; 3. Compared with the prior art, the household gas system of the present invention can utilize the existing gas supply pipeline to reasonably increase the pressure operation, avoid the pressure loss caused by the pressure reduction at the user end, reduce the gas transmission power consumption of the gas pipeline network, and improve the gas supply capacity of the pipeline network and the ability to supply more users without increasing the investment in the pipeline network; 4. Compared with the existing technical specifications for construction safety in the household gas industry, the technical solution of the present invention, if it becomes a general technical specification for the industry, will undoubtedly have great social and economic significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of a household gas system of the present invention.

[0035] Figure 1 Middle: 29-Main gas supply pipe, 30-Main gas supply pipe smart gas meter, 31-Main gas supply pipe low and high pressure start-stop valve, 32-Main gas intake pipe, 33-Buffer tank, 34-Safety valve, 40-No. 1 user smart gas meter, 41-No. 1 user low and high pressure start-stop valve, 42-No. 1 user gas intake pipe, 43-No. 1 user buffer gas tank, 44-No. 1 user safety valve, 45-No. 1 gas facilities, 46-No. 1 user gas supply pipeline, 50-No. 2 user smart gas meter , 51-low and high pressure start-stop valve of user No. 2, 52-air intake pipeline of user No. 2, 53-buffer gas tank of user No. 2, 54-safety valve of user No. 2, 55-gas using facility No. 2, 56-gas supply pipeline of user No. 2, 60-intelligent gas meter of user No. N, 61-low and high pressure start-stop valve of user No. N, 62-air intake pipeline of user No. N, 63-buffer gas tank of user No. N, 64-safety valve of user No. N, 65-gas using facility No. N, 66-gas supply pipeline of user No. N. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1 The present invention is further described in detail with reference to the accompanying drawings and specific examples.

[0037] Embodiment 1: A household gas system, the household gas system is provided with a main gas supply pipe intelligent gas meter 30, a No. 1 user intelligent gas meter 40, a No. 1 user low and high pressure start-stop valve 41, a No. 1 user buffer gas tank 43, a No. 2 user intelligent gas meter 50, a No. 2 user low and high pressure start-stop valve 51, a No. 2 user buffer gas tank 53, a No. N user intelligent gas meter 60, a No. N user low and high pressure start-stop valve 61, a No. N user buffer gas tank 63, wherein N of the No. N users is greater than or equal to 3, The domestic gas enters the No. 1 user's smart gas meter 40, the No. 1 user's low and high pressure start-stop valve 41, the No. 1 user's buffer gas tank 43, the No. 1 gas facility 45, the No. 2 user's smart gas meter 50, the No. 2 user's low and high pressure start-stop valve 51, the No. 2 user's buffer gas tank 53, the No. 2 gas facility 55, or the No. N user's smart gas meter 60, the No. N user's low and high pressure start-stop valve 61, the No. N user's buffer gas tank 63, the No. N gas facility 65 through the main gas supply pipe 29 and the main gas supply pipe smart gas meter 30. When the No. 1 gas-using facility 45 is put into use, gas is supplied to the No. 1 gas-using facility 45 through the No. 1 user buffer gas tank 43 and the No. 1 user gas supply pipeline 46. When the No. 2 gas-using facility 55 is put into use, gas is supplied to the No. 2 gas-using facility 55 through the No. 2 user buffer gas tank 53 and the No. 2 user gas supply pipeline 56. When the Nth gas-using facility 65 is put into use, gas is supplied to the Nth gas-using facility 65 through the Nth user buffer gas tank 63 and the Nth user gas supply pipeline 66. When the pressure in the buffer gas tank 43 of user No. 1 is at the set low pressure, the low and high pressure start-stop valve 41 of user No. 1 is opened; when the pressure in the buffer gas tank 43 of user No. 1 reaches the set high pressure, the low and high pressure start-stop valve 41 of user No. 1 is closed to stop gas supply. When the pressure in the buffer gas tank 53 of the second user is at the set low pressure, the low and high pressure start-stop valve 51 of the second user is opened; when the pressure in the buffer gas tank 53 of the second user reaches the set high pressure, the low and high pressure start-stop valve 51 of the second user is closed to stop gas supply. When the pressure in the buffer gas tank 63 of user N is at the set low pressure, the low and high pressure start-stop valve 61 of user N is opened; when the pressure in the buffer gas tank 63 of user N reaches the set high pressure, the low and high pressure start-stop valve 61 of user N is closed to stop gas supply. Since the above-mentioned low and high pressure start-stop valve can automatically and smoothly replenish gas to the buffer gas tank when the corresponding buffer gas tank is at low pressure, when the pressure in the buffer gas tank reaches the set high pressure, the low and high pressure start-stop valve is closed, and the entire gas replenishment process is continuous and smooth, thereby ensuring the stable and accurate metering of the smart gas meter; because when the gas facilities are put into use, it will cause pressure fluctuations and gas volume changes in domestic gas, but because it is supplied by buffer gas tanks, it will not affect the metering of the smart gas meters of users No. 1, No. 2 or No. N, thereby eliminating the influence of pressure and gas volume changes when traditional gas facilities are put into use on the metering accuracy of smart gas meters, and eliminating the influence of gas facilities on the gas supply system when they are put into use.

[0038] The main water supply pipe is equipped with a low-pressure start-stop valve 31 and a buffer tank 33: Domestic gas enters the buffer tank 33 through the main gas supply pipe 29, the main gas supply pipe intelligent gas meter 30, the main gas supply pipe low and high pressure start-stop valve 31, and the main air intake pipe 32, and then enters user No. 1, user No. 2 or user No. N.

[0039] The No. 1 gas-using facility 45 , the No. 2 gas-using facility 55 or the No. N gas-using facility 65 includes a gas stove, a gas water heater, and the like.

[0040] The main gas supply pipe 29, the No. 1 user gas intake pipeline 42, the No. 2 user gas intake pipeline 52, the No. N user gas intake pipeline 62 and the gas supply pipelines between the corresponding buffer gas tanks and the gas-using facilities include pipes, pipe fittings and their supporting parts.

[0041] The pipe fittings include elbows, tees, crosses, reducers, pipe caps, plugs, etc.

[0042] The connection between the pipes, the pipes and the pipe fittings, and the pipe fittings and the pipe fittings is achieved by welding, hot-melt connection, expansion connection, snap connection or threaded connection.

[0043] The gas-using facilities include gas water heaters, gas stoves, gas household hot water boilers, etc.

[0044] The low and high pressure on-off valve is started and stopped by mechanical, pneumatic or electric control.

[0045] An inert gas analyzer is provided: the inert gas analyzer is arranged between the low-pressure and high-pressure start-stop valves and the gas using facilities.

[0046] The inert gas analyzer is used to analyze the content of one or more gases, such as nitrogen, carbon dioxide or argon, in the fuel gas for judging the fuel gas quality.

[0047] The buffer tank 33 is provided with a safety valve 34, and an outlet pipe of the safety valve 34 is connected to a safe place.

[0048] The No. 1 user buffer gas tank 43 is provided with a No. 1 user safety valve 44 , and the outlet pipe of the No. 1 user safety valve 44 is connected to an outdoor safe place.

[0049] The No. 1 user buffer gas tank 43 is provided with a pressure gauge, and the pressure gauge is within the verification validity period.

[0050] The No. 2 user buffer gas tank 53 is provided with a No. 2 user safety valve 54 , and the outlet pipe of the No. 2 user safety valve 54 is connected to an outdoor safe place.

[0051] The No. 2 user buffer gas tank 53 is provided with a pressure gauge, and the pressure gauge is within the verification validity period.

[0052] The Nth user buffer gas tank 63 is provided with an Nth user safety valve 64, and the outlet pipe of the Nth user safety valve 64 is connected to an outdoor safe place.

[0053] The No. N user buffer gas tank 63 is provided with a pressure gauge, and the pressure gauge is within the verification validity period.

[0054] The household gas system is provided with a gas leakage detection instrument.

[0055] The household gas system is provided with a gas leakage alarm instrument.

[0056] The unspecified facilities in the domestic gas system are matched with reference to or in accordance with the reliable and mature technologies in the known domestic gas supply systems.

[0057] The unspecified facilities in the domestic gas system are matched with reference to or in accordance with the reliable and mature technologies in the known gas supply pipelines.

[0058] Although the present invention has been disclosed as above with preferred embodiments, they are not intended to limit the present invention. Anyone familiar with the art can make various changes or modifications without departing from the spirit and scope of the present invention, which also belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the definition of the claims of this application.

Claims

1. A household gas system, characterized in that: The household gas system is provided with a main gas supply pipe intelligent gas meter (30), a first user intelligent gas meter (40), a first user low-pressure start-stop valve (41), a first user buffer gas tank (43), a second user intelligent gas meter (50), a second user low-pressure start-stop valve (51), a second user buffer gas tank (53), an Nth user intelligent gas meter (60), a Nth user low-pressure start-stop valve (61), and a Nth user buffer gas tank (63), wherein N of the Nth user is greater than or equal to 3. The domestic gas enters the smart gas meter (40) of user No. 1, the low-pressure start-stop valve (41) of user No. 1, the buffer gas tank (43) of user No. 1, the gas facility No. 1 (45), the smart gas meter (50) of user No. 2, the low-pressure start-stop valve (51) of user No. 2, the buffer gas tank (53) of user No. 2, the gas facility No. 2 (55), or the smart gas meter (60) of user No. N, the low-pressure start-stop valve (61) of user No. N, the buffer gas tank (63) of user No. N, the gas facility No. N (65), through the main gas supply pipe (29) and the smart gas meter (30) of the main gas supply pipe. When the No. 1 gas-using facility (45) is put into use, the No. 1 user buffer gas tank (43) supplies gas to the No. 1 gas-using facility (45). When the No. 2 gas-using facility (55) is put into use, the No. 2 user buffer gas tank (53) supplies gas to the No. 2 gas-using facility (55). When the Nth gas-using facility (65) is put into use, the Nth user buffer gas tank (63) supplies gas to the Nth gas-using facility (65). When the pressure in the buffer gas tank (43) of the first user is at a set low pressure, the low and high pressure start-stop valve (41) of the first user is opened. When the pressure in the buffer gas tank (43) of the first user reaches a set high pressure, the low and high pressure start-stop valve (41) of the first user is closed to stop gas supply. When the pressure in the No. 2 user buffer gas tank (53) is at a set low pressure, the No. 2 user low and high pressure start-stop valve (51) opens; when the pressure in the No. 2 user buffer gas tank (53) reaches a set high pressure, the No. 2 user low and high pressure start-stop valve (51) closes to stop gas supply. When the pressure in the buffer gas tank (63) of user N is at a set low pressure, the low and high pressure start-stop valve (61) of user N is opened; when the pressure in the buffer gas tank (63) of user N reaches a set high pressure, the low and high pressure start-stop valve (61) of user N is closed to stop gas supply.

2. The domestic gas system according to claim 1, characterized in that: A low-pressure start-stop valve (31) and a buffer tank (33) are provided on the main gas supply pipe: The domestic gas enters the buffer tank (33) through the main gas supply pipe (29), the main gas supply pipe intelligent gas meter (30), the main gas supply pipe low-pressure start-stop valve (31), and the main gas intake pipe (32), and then enters user No. 1, user No. 2, or user No. N.

3. The domestic gas system according to claim 1, characterized in that: The No. 1 gas-using facility (45), the No. 2 gas-using facility (55) or the No. N gas-using facility (65) comprises a gas cooker, a gas water heater or a gas hot water boiler.

4. The domestic gas system according to claim 1, characterized in that: The main gas supply pipe (29), the No. 1 user gas intake pipe (42), the No. 2 user gas intake pipe (52), the No. N user gas intake pipe (62), and the gas supply pipes between the corresponding buffer water tanks and the gas-using facilities include pipes, pipe fittings and supporting parts thereof.

5. The domestic gas system according to claim 4, characterized in that: The pipe fittings include elbows, tees, crosses, reducers, pipe caps or plugs.

6. The domestic gas system according to claim 4, characterized in that: In the main gas supply pipe (29), the No. 1 user gas intake pipe (42), the No. 2 user gas intake pipe (52), the No. N user gas intake pipe (62), the gas supply pipes between the buffer gas tank and the gas using facilities, the pipes are connected to each other, the pipes are connected to each other, the pipes are connected to each other, the pipes are connected to each other, the pipes are connected to each other, the pipes are connected to each other, welding, hot-melt connection, expansion connection, snap connection or threaded connection is adopted.

7. The domestic gas system according to claim 1, characterized in that: An inert gas analyzer is provided: the inert gas analyzer is arranged between the low-pressure and high-pressure start-stop valves and the gas using facilities.

8. The domestic gas system according to claim 7, characterized in that: The inert gas analyzer is used to analyze the content of one or more gases, such as nitrogen, carbon dioxide or argon, in the fuel gas for judging the fuel gas quality.

9. The domestic gas system according to claim 1, characterized in that: The household gas system is provided with a gas leakage detection instrument.

10. The domestic gas system according to claim 1, characterized in that: The household gas system is provided with a gas leakage alarm instrument.

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