Civil natural gas leakage detection and explosion-proof control system and method

Abstract

The invention discloses a civil natural gas leakage detection and explosion-proof control system which comprises a leaked gas collecting device, a natural gas alarm and a gas ball valve. Wherein the gas ball valve is arranged on a natural gas home-entry pipeline and is in control connection with the natural gas alarm; the leaked gas collecting devices cover all areas where leaked gas is likely to be generated to collect the leaked gas and guide the collected leaked gas to the position under the natural gas alarm. The natural gas alarm is used for detecting the concentration of leaked gas, automatically giving an alarm and controlling the gas ball valve to be closed at the same time; and a leaked gas collecting device is also arranged above the natural gas alarm and is used for guiding leaked gas passing through the natural gas alarm device to the outdoors. According to the invention, natural gas possibly leaked from different areas can be detected, the alarm is triggered by using the leaked natural gas in time, and the leaked gas can be prevented from being accumulated in different isolated areas so as to avoid explosion accidents.

Description

Technical Field

[0001] The present invention belongs to the technical field of natural gas leakage monitoring and explosion protection, and particularly relates to a civil natural gas leakage detection and explosion protection control system and method. Background Art

[0002] The statements herein only provide background art related to the present invention and do not necessarily constitute prior art.

[0003] Natural gas belongs to the field of clean energy and is an industry that has been supported for development in recent years, with broad development prospects. With the continuous advancement of large-scale urbanization, the demand for natural gas among urban residents has increased significantly. However, with the widespread use of natural gas, accidents caused by natural gas leakage also occur from time to time, posing a major threat to people's lives and property. Therefore, accidents of residential users and industrial and commercial users have become the main application scenarios for natural gas leakage monitoring and explosion protection.

[0004] When a high concentration of natural gas leaks into a gas-using place such as a kitchen, if the concentration of the leaked gas is between 5% and 15%, any source of fire will cause a gas explosion, resulting in losses to people's lives and property. How to design an efficient natural gas leakage detection and explosion protection control system to timely and accurately detect and discover gas leakage incidents, and ensure that even when a gas leakage incident occurs, the concentration of the leaked gas will not exceed its lowest explosion concentration value, so as to have sufficient redundant time to timely eliminate the leakage fault before an explosion accident occurs due to gas leakage and ensure people's lives and property safety is one of the main technical challenges faced in the current gas safety field.

[0005] Currently, the gas prevention and control systems for existing civil and commercial housing on the market are generally set up as follows: (1) Install a natural gas alarm; (2) Install a natural gas alarm and a natural gas pipeline linkage cut-off valve; (3) Install a natural gas alarm, a natural gas pipeline linkage cut-off valve and a linkage fan exhaust device.

[0006] The inventor found that the problem with the first setting method is that a single alarm cannot effectively monitor and cover all leakage points and isolated areas in the kitchen; and in the second and third setting methods, starting electrical appliances is included. Starting any electrical equipment when the distribution and concentration of the leaked gas are unclear has the potential risk of causing a leakage explosion. Summary of the Invention

[0007] The object of the present invention is to overcome the deficiencies existing in the above-mentioned prior art, and to provide a civil natural gas leakage detection and explosion-proof control system and method, which can detect natural gas that may leak in different areas, and can timely trigger the alarm of the alarm by using the leaked natural gas, improve the monitoring efficiency of the leaked gas, eliminate the monitoring blind spots of gas leakage, and can also effectively avoid the accumulation of leaked gas in different isolated areas to avoid the occurrence of explosion accidents.

[0008] In order to achieve the above object, the present invention is realized by the following technical solutions:

[0009] On the one hand, the technical solution of the present invention provides a civil natural gas leakage detection and explosion-proof control system, including:

[0010] A leakage gas collection device, a natural gas alarm and a gas ball valve; wherein, the gas ball valve is arranged on the natural gas inlet pipeline and is controlledly connected to the natural gas alarm; the leakage gas collection device covers each area where leakage gas is likely to be generated to collect the leakage gas, and guides the collected leakage gas to directly below the natural gas alarm; the natural gas alarm is used to detect the concentration of the leakage gas and give an automatic alarm, and at the same time control the gas ball valve to close; a leakage gas collection device is also arranged above the natural gas alarm to guide the leakage gas passing through the natural gas alarm device outdoors.

[0011] In at least one embodiment, the leakage gas collection device is composed of a leakage gas collection cover and a gas guiding pipe, and the gas guiding pipe is connected to the opening at the upper part of the leakage gas collection cover.

[0012] In at least one embodiment, the leakage gas collection device includes a first leakage gas collection device, a second leakage gas collection device and a third leakage gas collection device; the first leakage gas collection device is arranged above the natural gas alarm; the second leakage gas collection device is arranged inside the stove and can cover all the natural gas pipelines inside the stove; the third leakage gas collection device is arranged in the area above the stove and can cover the entire stove.

[0013] In at least one embodiment, the third leakage gas collection device is arranged on the range hood above the stove. At the same time, the upper part of the range hood is open, and the natural gas inside the range hood is guided to the third leakage gas collection device through a conduit.

[0014] In at least one embodiment, the opening size of the lower part of the leakage gas collection cover of the first leakage gas collection device is larger than the size of the natural gas alarm.

[0015] In at least one embodiment, the leakage gas collection hood of the second leakage gas collection device is provided with two openings. One opening is arranged above the inlet part of the natural gas pipeline, and the other opening is clamped at the connection between the natural gas pipeline and the cooking range, and its size covers all the natural gas pipelines inside the cooking range.

[0016] In at least one embodiment, an exhaust device is arranged on the wall above the natural gas alarm.

[0017] In at least one embodiment, it further includes an outdoor natural gas alarm and an outdoor leakage gas collection device arranged below the outdoor natural gas alarm; the outdoor leakage gas collection device is arranged above the pipeline valve in the outdoor valve well, and is used for collecting the gas leaked from the pipeline valve and guiding it to directly below the outdoor natural gas alarm; the outdoor natural gas alarm is used for detecting the concentration of the leaked gas and giving an automatic alarm.

[0018] On the other hand, the technical solution of the present invention also provides a method for detecting natural gas leakage and explosion-proof control for civil use, including:

[0019] The leakage gas collection hoods respectively collect the leakage gas generated at various places, and the collected leakage gas is guided to directly below the natural gas alarm through the gas guiding pipe;

[0020] The natural gas alarm detects the concentration of the leakage gas in real time. If the concentration of the leakage gas exceeds the set value, the natural gas alarm gives an audible and visual alarm reminder, and at the same time controls the gas ball valve to shut off the natural gas pipeline and starts the exhaust device to discharge the leakage gas outdoors.

[0021] In at least one embodiment, it further includes:

[0022] The outdoor leakage gas collection hood collects the leakage gas generated at the pipeline valve, and the collected leakage gas is guided to directly below the outdoor natural gas alarm through the outdoor gas guiding pipe;

[0023] The outdoor natural gas alarm detects the concentration of the leakage gas in real time. If the concentration of the leakage gas exceeds the set value, the natural gas alarm gives an audible and visual alarm reminder, and the maintenance personnel carry out maintenance and repair on the pipeline valve.

[0024] The beneficial effects of the above technical solution of the present invention are as follows:

[0025] 1) The present invention collects the leaked natural gas by respectively arranging leak gas collection devices in each area prone to gas leakage, and guides its rising path, so as to uniformly guide the leaked gas in different indoor areas to directly below the natural gas alarm. This not only realizes the effective monitoring and full coverage of each leakage point and each isolated area in the room (i.e., in the kitchen) by using a single alarm, but also can accurately detect the concentration of natural gas overflowing from all leakage points in the room, avoiding the problem that the concentration of indoor leaked gas cannot be accurately detected due to the dispersion of leakage points.

[0026] 2) The present invention collects the leaked gas passing through the natural gas alarm and guides it outdoors, avoiding the long-term accumulation of leaked gas indoors, which may lead to the excessive concentration of indoor leaked gas and further avoid the occurrence of gas safety accidents such as natural gas explosion.

[0027] 3) Each structure of a civil natural gas leakage detection and explosion-proof control system of the present invention is simple, can be installed and used without modifying the existing equipment, has a low cost, and has high popularization potential. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The specification drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0029] Figure 1 It is a three-dimensional structure schematic diagram of a civil natural gas leakage detection and explosion-proof control system according to an embodiment of the present invention;

[0030] Figure 2 It is a structural diagram of a leak gas collection cover 1 used above a gas alarm and a conduit 1 for guiding the collected leak gas outdoors according to an embodiment of the present invention;

[0031] Figure 3 It is a schematic diagram of the usage method of a leak gas collection cover 1 used above a gas alarm and a conduit 1 for guiding the collected leak gas outdoors according to an embodiment of the present invention;

[0032] Figure 4 It is a structural diagram of a leak gas collection cover 2 used inside a cooking range and a conduit for guiding the collected leak gas 2 directly below the gas alarm according to an embodiment of the present invention;

[0033] Figure 5 It is a schematic diagram of the usage method of a leak gas collection cover 2 used inside a cooking range and a conduit for guiding the collected leak gas 2 directly below the gas alarm according to an embodiment of the present invention;

[0034] Figure 6Structural diagram of a leakage gas collection cover 3 for the top of a range hood in an embodiment of the present invention;

[0035] Figure 7 Structural diagram of a conduit 3 for guiding the collected leakage gas to directly below a gas alarm in an embodiment of the present invention for the top of a range hood;

[0036] Figure 8 Schematic diagram of the usage method of a leakage gas collection cover for the top of a range hood and a conduit for guiding the collected leakage gas to directly below a gas alarm in an embodiment of the present invention;

[0037] Figure 9 Structural diagram of a leakage gas collection cover, a bracket, and a conduit for guiding the collected leakage gas to directly below a gas alarm for the top above a pipeline valve in a valve well in an embodiment of the present invention;

[0038] Figure 10 Schematic diagram of an installation method of a gas leakage alarm system in a valve well in an embodiment of the present invention.

[0039] In the figure, 1. Natural gas alarm; 2. Gas ball valve; 3. Exhaust device; 4. First leakage gas collection cover; 5. First gas guiding pipe; 6. Second leakage gas collection cover; 7. Second gas guiding pipe; 8. Third leakage gas collection cover; 9. Third gas guiding pipe; 10. Outdoor natural gas alarm; 11. Fourth leakage gas collection cover; 12. Fourth gas guiding pipe; 13. Bracket. Detailed implementation manners

[0040] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0041] In a commercial or household environment, in order to monitor natural gas leakage, various gas alarms are usually used to achieve the monitoring and alarming of natural gas leakage. For general residential housing, the main generation areas of natural gas leakage are two, one is the area where the pipeline is connected at the bottom of the stove, and the other is the entire kitchen area.

[0042] Reasons for possible gas leakage in the area where the bottom of the stove is connected to the pipeline include: (1) When connecting the natural gas pipeline at the bottom of the stove, due to long-term contact with corrosive substances or the peeling off of the pipeline anticorrosive paint without timely rebrushing, the pipeline is corroded and damaged; (2) At the bottom of the stove, privately and unprofessionally modifying the gas pipeline, privately modifying the gas pipeline or adding a tee, or adding gas facilities, etc., resulting in natural gas leakage; (3) Natural gas leakage caused by the aging, detachment, breakage, etc. of the pipeline connecting the stove at the bottom of the stove. Since the area where the pipeline is connected at the bottom of the stove is a relatively enclosed space and the volume of this space is small, it is easier to cause the accumulation of leaked natural gas. At the same time, the path for the leaked natural gas to reach the natural gas alarm 1 in the kitchen is relatively long. Only relying on the natural diffusion and propagation of the leaked natural gas to reach the alarm and trigger the alarm, the natural gas concentration in the area where the pipeline is connected at the bottom of the stove may have reached a dangerous concentration.

[0043] Reasons for possible gas leakage in the kitchen area include: (1) The gas meter is damaged, that is, the internal components of the gas meter in use beyond the expiration date are aged or damaged by external forces, which may cause gas leakage from the gas meter; (2) Leakage caused by the flame being extinguished due to the liquid in the pot overflowing, that is, during large-fire cooking, due to untimely handling or the person leaving for a long time, the liquid in the pot overflows, causing the flame to be extinguished, but the gas switch is still in the open state, causing the gas to leak directly into the kitchen area through the stove; (3) The gas appliance cannot be completely closed due to long-term use, or is damaged and leaks due to artificial external force touch and friction.

[0044] During the above several types of gas leakage, since the specific gravity of the leaked natural gas is lighter than that of air, the leaked natural gas will rise and spread along the direction perpendicular to the ground from the leakage point towards the roof. When the natural gas reaches the roof, it will spread around along the roof until it fills the entire bottom of the roof. Then, as the leaked gas continues to increase, the thickness of the natural gas layer under the roof gradually increases and spreads downward until it reaches the air inlet of the natural gas alarm 1 and reaches the warning concentration, then it can trigger the natural gas alarm 1.

[0045] As introduced in the background technology, there are still many unsafe factors in the setting methods of the existing gas prevention and control systems for civilian and commercial housing on the market. Therefore, the present invention provides a civilian natural gas leakage detection and explosion-proof control system and method, which can detect the natural gas that may leak in different areas, and can timely trigger the alarm of the alarm by using the leaked natural gas, improve the monitoring efficiency of the leaked gas, eliminate the monitoring blind spots of gas leakage, and can also effectively avoid the accumulation of leaked gas in different isolated areas to avoid the occurrence of explosion accidents.

[0046] Embodiment 1

[0047] In a typical implementation manner of the present invention, as Figure 1As shown in the figure, this embodiment discloses a civil natural gas leakage detection and explosion-proof control system, including: a leakage gas collection device, a natural gas alarm 1, and a gas ball valve 2; among them, the gas ball valve 2 is arranged on the natural gas inlet pipeline and is connected to the natural gas alarm 1 for control; the leakage gas collection device covers each area prone to leakage gas to collect the leakage gas and guides the collected leakage gas to directly below the natural gas alarm 1; the natural gas alarm 1 is used to detect the concentration of the leakage gas and give an automatic alarm, and at the same time control the gas ball valve 2 to close; a leakage gas collection device is also arranged above the natural gas alarm 1 to guide the leakage gas passing through the natural gas alarm device outdoors.

[0048] Since the specific gravity of natural gas is less than that of atmospheric gas, when natural gas leaks, the leaked natural gas will rise and spread vertically from the leakage point along the ground. By respectively arranging leakage gas collection devices in each area prone to leakage gas to collect the leaked natural gas and guiding its rising path, the leakage gas in different indoor areas can be uniformly guided to directly below the natural gas alarm 1 and enter the air inlet of the natural gas alarm 1. If the natural gas concentration is greater than the set alarm value, the natural gas alarm 1 will give an audible and visual alarm. This not only realizes the effective monitoring and full coverage of each leakage point and each isolated area in the room (i.e., in the kitchen) by using a single alarm, but also can accurately detect the concentration of natural gas overflowing from all leakage points in the room, avoiding the problem that the concentration of indoor leakage gas cannot be accurately detected due to the dispersion of leakage points. Moreover, when the gas concentration exceeds the standard and alarms, the natural gas alarm 1 will also wirelessly control the gas ball valve 2 on the natural gas inlet pipeline to shut off the natural gas pipeline, capable of cutting off the natural gas leakage problem from the source. A leakage gas collection device is also arranged above the natural gas alarm 1 to collect the leakage gas passing through the natural gas alarm 1 and guide it outdoors, avoiding the long-term accumulation of leaked gas indoors, resulting in the indoor leakage gas concentration exceeding the standard, and further avoiding gas safety accidents such as natural gas explosion.

[0049] In addition, an exhaust device 3 is arranged on the wall above the natural gas alarm 1 and is connected to the natural gas alarm 1 for control. When the natural gas alarm 1 alarms, it controls the exhaust device 3 to start, capable of continuously exhausting the gas at the top of the room. Optionally, the exhaust device 3 can be a exhaust fan.

[0050] Furthermore, the leakage gas collection device consists of a leakage gas collection hood and a gas guiding pipe. The gas guiding pipe is connected to the opening at the uppermost part of the leakage gas collection hood. The size of the lower opening of the leakage gas collection hood should cover as much as possible all the areas within its region where gas leakage may occur. The leakage gas collection hood collects the leakage gas in this region. The leakage gas accumulates at the top of the leakage gas collection hood and is guided through the gas guiding pipe at the uppermost part of the leakage gas collection hood to directly below the natural gas alarm 1.

[0051] As Figure 1 shown, the leakage gas collection device includes a first leakage gas collection device, a second leakage gas collection device, and a third leakage gas collection device.

[0052] Specifically, as Figure 2 and Figure 3 shown, the first leakage gas collection device is arranged above the natural gas alarm 1 and includes a first leakage gas collection hood 4 and a first gas guiding pipe 5. The size of the lower opening of the first leakage gas collection hood 4 is larger than the size of the natural gas alarm 1. The leakage gas that floats up through the natural gas alarm 1 is collected by the first leakage gas collection hood 4 and accumulates at the top of the first leakage gas collection hood 4. One end of the first gas guiding pipe 5 is connected to the top of the first leakage gas collection hood 4, and the other end extends outside the room (i.e., outside the kitchen), capable of discharging the leakage gas accumulated at the top of the first leakage gas collection hood 4 outside the room to prevent the leakage natural gas from accumulating at the indoor ceiling.

[0053] As Figure 4 and Figure 5As shown in the figure, the second leaked gas collection device is arranged inside the cooking range and includes a second leaked gas collection hood 6 and a second gas guiding pipe 7. Among them, the second leaked gas collection hood 6 is provided with two openings. One opening is arranged above the inlet part of the natural gas pipeline, and the other opening is clamped at the connection between the natural gas pipeline and the cooking range. The size of the second leaked gas collection hood can adjust the openings according to the specific routing of the pipelines inside the cooking range so as to adapt to the internal structures of gas stoves from different manufacturers. However, the second leaked gas collection hood should be arranged to cover as much as possible all the natural gas pipelines inside the cooking range. At the highest part of the second leaked gas collection hood, a second gas guiding pipe 7 which can guide the collected leaked gas to directly below the natural gas alarm 1 is connected. In this way, if there is any leakage in the natural gas pipeline, the leaked natural gas will rise upwards, then be collected by the second leaked gas collection hood, and the leaked natural gas will be guided through the second guiding pipe to the opening of the cooking range directly below the natural gas alarm 1. At this time, after the leaked natural gas leaves the opening of the second guiding pipe, it continues to rise upwards to reach the natural gas alarm 1, triggering the natural gas alarm 1 to give an alarm. At the same time, the gas control ball valve 2 is controlled to shut off the natural gas pipeline, and the exhaust fan is started to continuously exhaust the gas at the top of the kitchen. At the same time, after these leaked natural gases pass through the natural gas alarm 1, they will be collected by the first leaked gas collection hood and led outdoors through the first gas conduit, as Figure 5 shown.

[0054] The third leaked gas collection device is arranged in the area above the cooking range and includes a third leaked gas collection hood 8 and a third gas guiding pipe 9. As Figures 6 - 8 shown, the third leaked gas collection hood 8 is arranged at the top of the range hood above the cooking range. This device is mainly used to collect the natural gas released from the gas stove by using the third leaked gas collection hood 8 when the gas valve of the gas stove is opened but the gas is extinguished, and guide it to directly below the natural gas alarm 1 through the third gas guiding pipe 9. As Figure 8 shown, a tee conduit is also arranged on the third gas guiding pipe 9, and one end of it is connected to the internal space at the top of the range hood so as to guide the natural gas accumulated in the internal space at the top of the range hood to directly below the natural gas alarm 1 and eliminate the hidden danger of high-concentration natural gas accumulation in the internal space at the top of the range hood.

[0055] Since all possible gas leakage locations are covered by gas leakage collection hoods, if natural gas leaks inside the kitchen, the leaked natural gas will be collected by the gas leakage collection hoods and guided through gas ducts to below the household natural gas alarm 1. Since the specific gravity of natural gas is less than that of atmospheric gas, the leaked natural gas at the opening of the natural gas duct will automatically float upward due to its light specific gravity and reach the intake of the laser natural gas alarm 1. If the concentration of the leaked natural gas is greater than the alarm value, the natural gas alarm 1 will give an audible and visual alarm, simultaneously control the gas ball valve 2 to shut off the natural gas pipeline, and start the exhaust fan to continuously discharge the gas at the top of the kitchen. When the leaked natural gas passes through the household natural gas alarm 1, it is collected by the first gas leakage collection hood 4 and led outdoors through the first gas duct 5, thus reducing the risk of the leaked natural gas accumulating on the kitchen roof.

[0056] Furthermore, the system of this embodiment further includes an outdoor natural gas alarm 10 and an outdoor gas leakage collection device arranged below the outdoor natural gas alarm 10. As Figure 9 and Figure 10 shown, the outdoor gas leakage collection device is arranged above the pipeline valve in the outdoor valve well, and it includes a fourth gas leakage collection hood 11 and a fourth gas duct 12, which can collect the gas leaked from the pipeline valve and guide it to directly below the outdoor natural gas alarm 10. The outdoor natural gas alarm 10 detects the concentration of the leaked gas and gives an automatic alarm. Optionally, the outdoor gas leakage collection device is installed through a bracket 13 to ensure that the outdoor gas leakage collection device can be stably arranged above the pipeline valve. If natural gas leaks at the pipeline valve in the valve well, the leaked natural gas will be collected by the fourth gas leakage collection hood 11, and the leaked natural gas will be guided to directly below the natural gas alarm 1 through the fourth gas duct 12, thus greatly improving the efficiency of detecting natural gas leakage.

[0057] A civil natural gas leakage detection and explosion-proof control system of this embodiment, by setting multiple gas leakage collection devices to cover any possible leaking pipelines, valves, gas meters, and gas appliances indoors, can collect the leaked gas generated in different indoor areas and guide the leaked natural gas to spread along a preset path. Through a single natural gas alarm 1, it realizes the detection of natural gas leakage in all directions indoors. The leaked natural gas is collected by the first gas leakage collection hood 4 and led outdoors through the first gas duct 5 connected to the top of the first gas leakage collection hood 4, thus avoiding the accumulation of leaked gas in various areas of the kitchen and the potential hazard of natural gas explosion. Moreover, the structures of this system are simple, and it can be installed and used without modifying the existing equipment, with low cost and high popularization potential.

[0058] Embodiment 2

[0059] In a typical embodiment of the present invention, this embodiment discloses a method for detecting civil natural gas leakage and explosion-proof control, including:

[0060] The leakage gas collection hood collects the leakage gas generated at various places, and the collected leakage gas is guided to directly below the natural gas alarm 1 through the gas guiding pipe;

[0061] The natural gas alarm 1 detects the concentration of the leakage gas in real time. If the concentration of the leakage gas exceeds the set value, the natural gas alarm 1 gives an audible and visual alarm reminder, and at the same time controls the gas ball valve 2 to shut off the natural gas pipeline and starts the exhaust device 3 to discharge the leakage gas outdoors.

[0062] Furthermore, it also includes:

[0063] The outdoor leakage gas collection hood collects the leakage gas generated at the pipeline valve, and the collected leakage gas is guided to directly below the outdoor natural gas alarm 10 through the outdoor gas guiding pipe;

[0064] The outdoor natural gas alarm 10 detects the concentration of the outdoor gas in real time. If the concentration of the leakage gas exceeds the set value, the natural gas alarm 1 gives an audible and visual alarm reminder, and the maintenance personnel carry out maintenance and repair on the pipeline valve.

[0065] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A civil natural gas leak detection and explosion-proof control system, characterized in that: include: A leaked gas collection device, a natural gas alarm and a gas ball valve; wherein the gas ball valve is arranged on the natural gas household pipeline and is control-connected to the natural gas alarm; the leaked gas collection device covers each area prone to leaked gas to collect the leaked gas, and guides the collected leaked gas to the bottom of the natural gas alarm; the natural gas alarm is used to detect the concentration of leaked gas and automatically alarm, and at the same time control the gas ball valve to close; a leaked gas collection device is also arranged above the natural gas alarm to guide the leaked gas passing through the natural gas alarm device to the outdoors.

2. A civil natural gas leak detection and explosion-proof control system as claimed in claim 1, characterized in that: The leaked gas collection device consists of a leaked gas collection cover and a gas guide pipe, and the gas guide pipe is connected to an opening on the upper part of the leaked gas collection cover.

3. A civil natural gas leak detection and explosion-proof control system as claimed in claim 2, characterized in that: The leaked gas collection device includes a first leaked gas collection device, a second leaked gas collection device and a third leaked gas collection device; the first leaked gas collection device is arranged above the natural gas alarm; the second leaked gas collection device is arranged inside the stove and can cover all natural gas pipelines inside the stove; the third leaked gas collection device is arranged in the area above the stove and can cover the entire stove.

4. A civil natural gas leak detection and explosion-proof control system as claimed in claim 3, characterized in that: The third leaked gas collection device is arranged on the range hood above the stove. At the same time, the upper part of the range hood is opened, and the natural gas inside the range hood is guided to the third leaked gas collection device through a conduit.

5. A civil natural gas leakage detection and explosion-proof control system as claimed in claim 3, characterized in that: The size of the lower opening of the leaked gas collection cover of the first leaked gas collection device is larger than the size of the natural gas alarm.

6. A civil natural gas leak detection and explosion-proof control system as claimed in claim 1, characterized in that: The leakage gas collection cover of the second leakage gas collection device is provided with two openings, one opening is arranged above the inlet part of the natural gas pipeline, and the other opening is clamped at the connection between the natural gas pipeline and the stove, and its size covers all the natural gas pipelines inside the stove.

7. A civil natural gas leak detection and explosion-proof control system as claimed in claim 1, characterized in that: An exhaust device is arranged on the wall above the natural gas alarm.

8. A civil natural gas leak detection and explosion-proof control system as claimed in claim 1, characterized in that: It also includes an outdoor natural gas alarm and an outdoor leaked gas collection device arranged below the outdoor natural gas alarm; the outdoor leaked gas collection device is arranged above the pipeline valve in the outdoor valve well, and is used to collect the gas leaked from the pipeline valve and guide it to the bottom of the outdoor natural gas alarm; the outdoor natural gas alarm is used to detect the concentration of leaked gas and automatically alarm.

9. A method for detecting and preventing explosion of natural gas leaks for civil use, characterized in that: include: The leaked gas collection hood collects the leaked gas generated at various locations, and the collected leaked gas is guided to the bottom of the natural gas alarm through the gas guide pipe; The natural gas alarm detects the concentration of leaked gas in real time. If the concentration of leaked gas exceeds the set value, the natural gas alarm will give an audible and visual alarm reminder, while controlling the gas ball valve to shut off the natural gas pipeline and starting the exhaust device to discharge the leaked gas to the outdoors.

10. A method for detecting and preventing explosion of civil natural gas leakage according to claim 9, characterized in that: Also includes: The outdoor leaking gas collection hood collects the leaking gas generated at the pipeline valve, and the collected leaking gas is guided to the bottom of the outdoor natural gas alarm through the outdoor gas guide pipe; The outdoor natural gas alarm detects the concentration of leaked gas in real time. If the concentration of leaked gas exceeds the set value, the natural gas alarm will sound and light alarms to remind maintenance personnel to maintain and repair the pipeline valves.

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