Gas leakage detection alarm system for laboratory

Abstract

The invention provides a gas leakage detection alarm system for a laboratory, and relates to the technical field of combustible gas early warning, the gas leakage detection alarm system comprises a nitrogen protection mechanism, a pipeline group, a concentration detection probe, an explosion-proof fan and a concentration alarm host, the head and tail ends of the pipeline group are respectively communicated with a combustible gas cylinder and experimental equipment; the tail end of the pipeline group is provided with a first outlet communicated with experimental equipment and a second outlet for emptying; a first pneumatic valve is arranged at the first outlet, and a second pneumatic valve is arranged at the second outlet; a third pneumatic valve is arranged at the head end of the pipeline group; the nitrogen protection mechanism comprises at least one nitrogen cylinder, and electromagnetic valves are arranged at the communication positions of the nitrogen cylinders, the first pneumatic valve, the second pneumatic valve and the third pneumatic valve. The first pneumatic valve and the third pneumatic valve are normally open, and the second pneumatic valve is normally closed; the concentration detection probe is arranged beside the pipeline group; and the concentration alarm host is electrically connected with the concentration detection probe, the electromagnetic valve and the anti-explosion fan respectively.

Description

Technical Field

[0001] The invention relates to the technical field of combustible gas early warning technology, and in particular to a gas leakage detection and alarm system for a laboratory. Background Art

[0002] With the development of society and the trend of national policies, new energy, materials, microelectronics, photovoltaics, biomedicine and other related industries are developing rapidly. Various scientific research institutes and university laboratories use certain equipment that requires flammable gases to varying degrees. Usually, flammable gases are stored in cylinders and connected to the equipment. However, flammable gases are toxic, flammable and explosive, which makes them have certain safety hazards. Since flammable gas leaks occur from time to time, in order to ensure the safety of people's lives and property, flammable gas leak alarm systems came into being.

[0003] The flammable gas leak detection and alarm systems currently available on the market generally include a gas detection module and an audible and visual alarm module connected to the gas detection module. During use, if the gas sensor detects flammable gas, it will immediately send a signal to the audible and visual alarm module, and the audible and visual alarm module will emit a unified alarm tone and indicator light to remind the user. Although the existing simple flammable gas leak detection and alarm system can play a certain preventive effect during use, it requires the user to know the alarm information in time and has a delay to manually ventilate and exhaust the air and find the corresponding leak location to manually stop the leak. It is impossible to take corresponding leak-stopping and ventilation protection measures in time when the leak is known. There is still a great risk to both the laboratory and the personal safety of users.

[0004] Therefore, the present invention provides a gas leakage detection and alarm system for laboratory use. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention proposes a laboratory gas leak detection alarm system to solve the problem that the simple system in the prior art requires the user to know the alarm information in time and has a delay in manually ventilating and exhausting the gas and finding the corresponding leakage location to manually stop the leakage.

[0006] The technical solution of the present invention is achieved in this way:

[0007] A gas leakage detection and alarm system for a laboratory, comprising a nitrogen protection mechanism, a pipeline group, a concentration detection probe, an explosion-proof fan and a concentration alarm host, wherein the head and tail ends of the pipeline group are respectively connected to a combustible gas cylinder and an experimental device; the tail end of the pipeline group is provided with a first outlet connected to the experimental device and a second outlet for emptying; a first pneumatic valve is provided at the first outlet, and a second pneumatic valve is provided at the second outlet; a third pneumatic valve is provided at the head end of the pipeline group;

[0008] The nitrogen protection mechanism comprises at least one nitrogen cylinder, and a solenoid valve is provided at the connection between the nitrogen cylinder and the first pneumatic valve, the second pneumatic valve and the third pneumatic valve; the first pneumatic valve and the third pneumatic valve are normally open, and the second pneumatic valve is normally closed;

[0009] The concentration detection probe is arranged beside the pipeline group;

[0010] The concentration alarm host is electrically connected to the concentration detection probe, the solenoid valve and the explosion-proof fan respectively.

[0011] Preferably, the pipeline group is further provided with a secondary pipeline along the airflow direction, the secondary pipeline is provided with a fourth pneumatic valve and is connected to the nitrogen cylinder and a solenoid valve is provided at the connection point, and the fourth pneumatic valve is a normally closed type.

[0012] Preferably, the pipeline group includes a one-way valve and a connector connected to the combustible gas cylinder, and the connector is sequentially connected to the one-way valve and the third pneumatic valve along the gas flow direction.

[0013] Preferably, the pipeline group also includes a first air inlet pressure gauge and a first air outlet pressure gauge, the first air inlet pressure gauge is provided with two air outlets and one air inlet, the air inlet is connected to the third pneumatic valve; one of the air outlets is connected to the second pneumatic valve and the second outlet in sequence, and the other air outlet is connected to the first air outlet pressure gauge, the first pneumatic valve and the first outlet in sequence.

[0014] Preferably, a first pressure reducing valve is provided at the connection point between the first air outlet pressure gauge and the first air inlet pressure gauge, and an air outlet control ball valve is provided at the connection point between the first air outlet pressure gauge and the first pneumatic valve.

[0015] Preferably, a first high-pressure hose and a first high-pressure ball valve are provided in sequence at the connection point between the first air intake pressure gauge and the third pneumatic valve.

[0016] Preferably, the connection point between the nitrogen cylinder and the battery valve is connected in sequence with a second high-pressure hose, a second high-pressure ball valve and a second pressure reducing valve, and a second air inlet pressure gauge and a second air outlet pressure gauge are respectively installed at the head and tail ends of the second high-pressure ball valve.

[0017] Preferably, the first pressure reducing valve is also connected to a third air outlet pressure gauge and an exhaust ball valve.

[0018] Preferably, a backfire prevention valve is further provided at the tail end of the pipeline group, and the backfire prevention valve is located behind the first pneumatic valve.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] By adopting this solution, when the concentration detection probe senses a gas leak, it feeds back a signal to the concentration alarm host to alarm to notify the on-duty personnel or other users to take emergency measures. At the same time, the alarm host sends a working signal to the explosion-proof fan and the solenoid valve. The explosion-proof fan performs high-power exhaust, and the operation of the solenoid valve causes the nitrogen in the nitrogen cylinder to rush out, so that the normally open first pneumatic valve and the third pneumatic valve are turned to a closed state, and the gas in the combustible gas cylinder is promptly cut off from continuing to output. At the same time, the nitrogen opens the normally closed second pneumatic valve, and the gas remaining in the pipeline group is mixed with nitrogen in time for dilution and emptied to the outside through the second outlet, thereby cutting off and emptying the leaking gas, solving the problem in the prior art that the simple system requires the user to know the alarm information in a timely manner and has a delay in manually ventilating and exhausting the air and finding the corresponding leakage position for manual leakage stop. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 This is a schematic diagram of the composition structure of a laboratory gas leakage detection and alarm system of the present invention;

[0023] Figure 2 for Figure 1 The enlarged schematic diagram of the middle A part;

[0024] Figure 3 for Figure 1 The enlarged schematic diagram of the middle part B;

[0025] Figure identification: 1-combustible gas cylinder; 2-pipeline group; 21-first outlet; 22-second outlet; 23-first pneumatic valve; 24-second pneumatic valve; 25-third pneumatic valve; 26-auxiliary pipeline; 27-fourth pneumatic valve; 28-check valve; 29-first inlet pressure gauge; 291-first outlet pressure gauge; 292-first pressure reducing valve; 293-outlet control ball valve; 294-first high-pressure hose; 295-first high-pressure ball valve; 296-second high-pressure hose; 297-second high-pressure ball valve; 298-second pressure reducing valve; 299-second inlet pressure gauge; 2991-second outlet pressure gauge; 2992-third outlet pressure gauge; 2993-empty ball valve; 2994-backfire prevention valve; 3-nitrogen cylinder; 4-battery valve; 5-concentration detection probe; 6-explosion-proof fan; 7-concentration alarm host. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", "fourth", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] This embodiment provides a laboratory gas leak detection alarm system, such as Figure 1 and Figure 2 and Figure 3 As shown, it includes a nitrogen protection mechanism, a pipeline group 2, a concentration detection probe 5, an explosion-proof fan 6 and a concentration alarm host 7. The head and tail ends of the pipeline group 2 are respectively connected to the combustible gas cylinder 1 and the experimental equipment; the tail end of the pipeline group 2 is provided with a first outlet 21 connected to the experimental equipment and a second outlet 22 for emptying; the first outlet 21 is provided with a first pneumatic valve 23, and the second outlet 22 is provided with a second pneumatic valve 24; the head end of the pipeline group 2 is provided with a third pneumatic valve 25; the nitrogen protection mechanism includes at least one nitrogen cylinder 3, and the nitrogen cylinder 3 is connected to the first pneumatic valve 23, the second pneumatic valve 24 and the third pneumatic valve 25 and is provided with an electromagnetic valve; the first pneumatic valve 23 and the third pneumatic valve 25 are normally open, and the second pneumatic valve 24 is normally closed; the concentration detection probe 5 is arranged on the side of the pipeline group 2; the concentration alarm host 7 is electrically connected to the concentration detection probe 5, the electromagnetic valve and the explosion-proof fan 6 respectively.

[0030] Working principle: When the concentration detection probe 5 senses a gas leak, it feeds back a signal to the concentration alarm host to alarm to notify the on-duty personnel or other users to take emergency measures. At the same time, the alarm host sends a working signal to the explosion-proof fan 6 and the solenoid valve. The explosion-proof fan 6 performs high-power exhaust, and the operation of the solenoid valve causes the nitrogen in the nitrogen cylinder 3 to rush out, so that the normally open first pneumatic valve 23 and the third pneumatic valve 25 are turned to a closed state, and the gas in the combustible gas cylinder 1 is promptly cut off from continuing to output. At the same time, the nitrogen opens the normally closed second pneumatic valve 24, and the gas remaining in the pipeline group 2 is mixed with nitrogen in time for dilution and the gas is emptied to the outside through the second outlet 22, thereby cutting off and emptying the leaking gas, solving the problem in the prior art that the simple system requires the user to know the alarm information in time and has a delay in manually ventilating and exhausting and finding the corresponding leakage position for manual leakage stop.

[0031] In this embodiment, the pipeline group 2 is also provided with a secondary pipeline 26 along the airflow direction. The secondary pipeline 26 is provided with a fourth pneumatic valve 27 and is connected to the nitrogen cylinder 3 and a solenoid valve is provided at the connection point. The fourth pneumatic valve 27 is a normally closed type. The battery valve cuts off the gas in the combustible gas cylinder in the pipeline group to continue to output. At the same time, nitrogen is extracted from the nitrogen cylinder 3 to open the fourth pneumatic valve 27 to dilute the combustible gas retained in the pipeline group and cooperate with the second pneumatic valve to discharge the diluted gas to the outdoors.

[0032] In this embodiment, the pipeline group 2 includes a one-way valve 28 and a joint connected to the combustible gas cylinder 1, and the joint is connected to the one-way valve 28 and the third pneumatic valve 25 in sequence along the gas flow direction.

[0033] In this embodiment, the pipeline group 2 also includes a first air inlet pressure gauge 29 and a first air outlet pressure gauge 291. The first air inlet pressure gauge 29 is provided with two air outlets and one air inlet, and the air inlet is connected to the third pneumatic valve 25; one of the air outlets is connected to the second pneumatic valve 24 and the second outlet 22 in sequence, and the other air outlet is connected to the first air outlet pressure gauge 291, the first pneumatic valve 23 and the first outlet 21 in sequence.

[0034] In this embodiment, a first pressure reducing valve 292 is provided at the connection point between the first outlet pressure gauge 291 and the first inlet pressure gauge 29 , and an outlet control ball valve 293 is provided at the connection point between the first outlet pressure gauge 291 and the first pneumatic valve 23 .

[0035] In this embodiment, a first high-pressure hose 294 and a first high-pressure ball valve 295 are provided in sequence at the connection point between the first air intake pressure gauge 29 and the third pneumatic valve 25 .

[0036] In this embodiment, the connection point between the nitrogen cylinder 3 and the battery valve 4 is connected in sequence with a second high-pressure hose 296, a second high-pressure ball valve 297 and a second pressure reducing valve 298, and the second high-pressure ball valve 297 is respectively installed with a second air inlet pressure gauge 299 and a second air outlet pressure gauge 2991 at both ends.

[0037] In this embodiment, the first pressure reducing valve 292 is also connected to a third outlet pressure gauge 2992 and an exhaust ball valve 2993 .

[0038] In this embodiment, a backfire prevention valve 2994 is further provided at the tail end of the pipeline group 2 , and the backfire prevention valve 2994 is located behind the first pneumatic valve 23 .

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A laboratory gas leak detection and alarm system, characterized in that: The invention comprises a nitrogen protection mechanism, a pipeline group (2), a concentration detection probe (5), an explosion-proof fan (6) and a concentration alarm host (7); the head and tail ends of the pipeline group (2) are respectively connected to a flammable gas cylinder (1) and an experimental device; the tail end of the pipeline group (2) is provided with a first outlet (21) connected to the experimental device and a second outlet (22) for exhausting; the first outlet (21) is provided with a first pneumatic valve (23), and the second outlet (22) is provided with a second pneumatic valve (24); the head end of the pipeline group (2) is provided with a third pneumatic valve (25); The nitrogen protection mechanism comprises at least one nitrogen cylinder (3), wherein a solenoid valve is provided at a connection point between the nitrogen cylinder (3) and a first pneumatic valve (23), a second pneumatic valve (24) and a third pneumatic valve (25); the first pneumatic valve (23) and the third pneumatic valve (25) are normally open, and the second pneumatic valve (24) is normally closed; The concentration detection probe (5) is arranged beside the pipeline group (2); The concentration alarm host (7) is electrically connected to the concentration detection probe (5), the solenoid valve and the explosion-proof fan (6) respectively.

2. A laboratory gas leak detection and alarm system according to claim 1, characterized in that: The pipeline group (2) is also provided with a secondary pipeline (26) along the airflow direction, the secondary pipeline (26) is provided with a fourth pneumatic valve (27) and is connected to the nitrogen gas cylinder (3) and a solenoid valve is provided at the connection point, and the fourth pneumatic valve (27) is a normally closed type.

3. A laboratory gas leak detection and alarm system according to claim 2, characterized in that: The pipeline group (2) comprises a one-way valve (28) and a joint connected to the combustible gas cylinder (1), wherein the joint is sequentially connected to the one-way valve (28) and the third pneumatic valve (25) along the gas flow direction.

4. A laboratory gas leak detection and alarm system according to claim 3, characterized in that: The pipeline group (2) also includes a first air inlet pressure gauge (29) and a first air outlet pressure gauge (291); the first air inlet pressure gauge (29) is provided with two air outlets and one air inlet, the air inlet being connected to the third pneumatic valve (25); one of the air outlets is connected to the second pneumatic valve (24) and the second outlet (22) in sequence, and the other air outlet is connected to the first air outlet pressure gauge (291), the first pneumatic valve (23) and the first outlet (21) in sequence.

5. A laboratory gas leak detection and alarm system according to claim 4, characterized in that: A first pressure reducing valve (292) is provided at the connection point between the first air outlet pressure gauge (291) and the first air inlet pressure gauge (29), and an air outlet control ball valve (293) is provided at the connection point between the first air outlet pressure gauge (291) and the first pneumatic valve (23).

6. A laboratory gas leak detection and alarm system according to claim 5, characterized in that: A first high-pressure hose (294) and a first high-pressure ball valve (295) are provided in sequence at the connection point between the first air intake pressure gauge (29) and the third pneumatic valve (25).

7. A laboratory gas leak detection and alarm system according to claim 4, characterized in that: The connection point between the nitrogen cylinder (3) and the battery valve (4) is connected in sequence with a second high-pressure hose (296), a second high-pressure ball valve (297) and a second pressure reducing valve (298), and the second high-pressure ball valve (297) is respectively installed with a second air inlet pressure gauge (299) and a second air outlet pressure gauge (2991) at both ends.

8. A laboratory gas leak detection and alarm system according to claim 5, characterized in that: The first pressure reducing valve (292) is also connected to a third air outlet pressure gauge (2992) and an exhaust ball valve (2993).

9. A laboratory gas leak detection and alarm system according to claim 1, characterized in that: A backfire prevention valve (2994) is also provided at the rear end of the pipeline group (2), and the backfire prevention valve (2994) is located behind the first pneumatic valve (23).

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