阅读说明：本技术 一种压缩空气泡沫灭火装置 (Compressed air foam fire extinguishing device ) 是由 张佳庆 程登峰 李金忠 周亦夫 张晓东 陈庆涛 过羿 韩焦 石祥建 柯艳国 尚峰 于 2021-08-06 设计创作，主要内容包括：本发明提供一种压缩空气泡沫灭火装置,通过设置的第一阀门,可在检测时,无须外接设备,直接关闭第二阀门,打开第一阀门,即可实现检测压缩机及阀门的性能,空气直接排放到环境中,检测简便；通过第三阀门的设计,使得检测时,第三阀门、第四阀门、水泵、第五阀门、水箱形成闭环,整个水路检测在装置内部即可完成,无需外接设备,同时不会浪费水；通过第六阀门和第七阀门的设计,使得第六阀门、第七阀门、泡沫液泵形成闭环,利用管道内存留的泡沫液即可实现检测,整个检测过程在装置内部完成,无需实际产生泡沫,即节约成本,又不会对周边造成影响。(The invention provides a compressed air foam fire extinguishing device, which is characterized in that a first valve is arranged, so that when in detection, external equipment is not needed, a second valve is directly closed, the first valve is opened, the performance of a compressor and the performance of the valve can be detected, air is directly discharged into the environment, and the detection is simple and convenient; through the design of the third valve, when in detection, the third valve, the fourth valve, the water pump, the fifth valve and the water tank form a closed loop, the whole water path detection can be completed in the device, external equipment is not needed, and water is not wasted; through the design of sixth valve and seventh valve for sixth valve, seventh valve, foam liquid pump form the closed loop, utilize the foam liquid that persists in the pipeline can realize detecting, and whole testing process is accomplished inside the device, need not the actual foam that produces, practices thrift the cost promptly, can not cause the influence to the periphery again.)

1. A compressed air foam fire extinguishing apparatus is characterized in that the compressed air foam fire extinguishing apparatus comprises an air supply unit, a water supply unit, a foam supply unit, a mixing output unit and a controller;

the air supply unit comprises an air compressor (11), a first valve (12) and a second valve (13), wherein the outlet end of the air compressor (11) is communicated with the external environment through the first valve (12) and is connected with the inlet end of the gas-liquid mixer (42) through the second valve (13);

the water supply unit comprises a water tank, a third valve (21), a fourth valve (22), a fifth valve (23) and a water pump (24); a fifth valve (23), a water pump (24) and a fourth valve (22) are sequentially connected to the first water outlet of the water tank according to the water flow direction; the fourth valve (22) is connected with the inlet end of the mixing output unit; the second water outlet of the water tank is also connected to the upstream of a fourth valve (22) and the downstream of a water pump (24) through a third valve (21);

the foam supply unit comprises a foam liquid tank, a sixth valve (31), a seventh valve (32) and a foam liquid pump (33); an outlet of the foam liquid tank is sequentially connected with a seventh valve (32), a foam liquid pump (33) and a sixth valve (31) along the flow direction of the foam liquid; the sixth valve (31) is a three-way valve and comprises an output end and a detection end; the output end of the sixth valve (31) is connected with the inlet end of the mixing output unit, and the detection end is connected to the upstream of the seventh valve (32) through a bypass pipe;

the controller controls the opening and closing of the first valve (12) to the seventh valve (32), the air compressor (11), the water pump (24) and the foam liquid pump (33);

the inspection method comprises the inspection of the gas circuit, the water circuit and the foam liquid circuit respectively,

the gas circuit inspection comprises:

step 1, starting an inspection flow of the fire extinguishing device, starting the inspection flow of the compressed air foam fire extinguishing device after a control module receives a starting instruction, and entering step 2;

step 2, opening a bypass first valve (12), and closing a main pipeline second valve (13);

step 3, judging whether the position feedback of the first valve (12) and the second valve (13) is normal or not, if the position feedback is normal, entering step 4, otherwise, sending an air supply unit inspection abnormal alarm, and skipping to step 7;

step 4, starting the running time T1 of one of the air compressors (11), and executing step 5;

step 5, closing the air compressor (11), starting the rest air compressors (11) in sequence, and entering step 6 after the running time T1 is up respectively;

step 6, judging whether the polling of the air compressor (11) is normal, if the polling is normal, entering step 7, if the polling is abnormal, sending an abnormal polling alarm of the air supply unit, and then entering step 7;

step 7, closing the first valve (12), opening the second valve (13), restoring the first valve (12) and the second valve (13) to default positions, and finishing the inspection of the air supply unit;

the waterway inspection comprises the following steps:

step 1, opening a third valve (21) and entering a water supply unit for inspection;

step 2, judging whether the third valve (21) is normally opened, if the third valve is normally opened, entering step 3, if the third valve is abnormal, sending out an inspection abnormal alarm of the water supply unit, and skipping to step 15;

step 3, starting one of the water pumps (24), running time T2, and entering step 11;

step 4, turning off the water pump (24), sequentially starting the other water pumps (24), respectively turning off after the running time T2, and entering the step 5;

step 5, judging whether the water pump (24) is in normal polling or not, if the polling is normal, entering step 6, if the polling is abnormal, sending a water supply unit polling abnormal alarm, and skipping to step 8;

step 6, closing the third valve (21), closing the fifth valve (23), opening the fourth valve (22), and inspecting the outlet valve;

step 7, judging whether the position feedback of the third valve (21), the fourth valve (22) and the fifth valve (23) is normal or not, if the position feedback is normal, entering step 8, if the position feedback is abnormal, sending out an inspection abnormal alarm of a water supply unit, and entering step 8;

step 8, closing the third valve (21), closing the fourth valve (22), opening the fifth valve (23), restoring the third valve (21), the fourth valve (22) and the fifth valve (23) to default positions, and finishing the inspection of the water supply unit;

the foam liquid inspection comprises the following steps:

step 1, rotating a sixth valve (31) to an inspection position, and opening a seventh valve (32);

step 2, judging whether the position feedback of the sixth valve (31) and the seventh valve (32) is normal or not, if the position feedback is normal, entering step 3, if the position feedback is abnormal, sending out an inspection abnormal alarm of a foam supply unit, and skipping to step 6;

step 3, starting one of the foam pumps (33), and carrying out operation time T3;

step 4, closing the foam liquid pump (33), starting the other foam liquid pumps (33), respectively closing after running time T3, and entering step 5;

step 5, judging whether the polling of the foam liquid pump (33) is normal, if the polling is normal, entering step 6, if the polling is abnormal, sending out a polling abnormal alarm of the foam supply unit, and entering step 6;

step 6, closing the seventh valve (32), and turning the sixth valve (31) to a working position;

and 7, finishing the inspection process.

2. A compressed air foam fire extinguishing apparatus according to claim 1, characterized in that the mixing output unit comprises a liquid-liquid mixer (41) and a gas-liquid mixer (42); the outlet ends of the fourth valve (22) and the sixth valve (31) are connected with the inlet end of a liquid-liquid mixer (41), the outlet end of the second valve (13) is connected with the inlet end of a gas-liquid mixer (42), and the outlet end of the liquid-liquid mixer (41) is connected with the inlet end of the gas-liquid mixer (42).

3. A compressed air foam fire extinguishing apparatus according to claim 1 or 2, wherein there are two air compressors (11), the outlet ends of the two air compressors (11) being connected by a line to a second valve (13), the first valve (12) being located upstream of the second valve (13).

4. A compressed air foam fire extinguishing apparatus according to claim 1 or 2, wherein there are two water pumps (24), and the water outlet ends of the two water pumps (24) are connected to the inlet end of the fourth valve (22) through a pipeline.

5. A compressed air foam fire extinguishing apparatus according to claim 1 or 2, wherein there are two foam pumps (33), the seventh valve (32) being connected by a line to the inlet ends of the two foam pumps (33), and the outlet ends of the two foam pumps (33) being connected by a line to the sixth valve (31).

6. A compressed air foam fire extinguishing apparatus according to claim 1 or 2, characterized in that the first valve (12) to the seventh valve (32) are all solenoid valves.

7. A compressed air foam fire extinguishing device is characterized by comprising an air supply unit, a water supply unit, a foam supply unit, a mixing output unit and a controller;

the air supply unit comprises an air compressor (11), a first valve (12) and a second valve (13), wherein the outlet end of the air compressor (11) is communicated with the external environment through the first valve (12) and is connected with the inlet end of the gas-liquid mixer (42) through the second valve (13);

the water supply unit comprises a water tank, a third valve (21), a fourth valve (22), a fifth valve (23) and a water pump (24); a fifth valve (23), a water pump (24) and a fourth valve (22) are sequentially connected to the first water outlet of the water tank according to the water flow direction; the fourth valve (22) is connected with the inlet end of the mixing output unit; the second water outlet of the water tank is also connected to the upstream of a fourth valve (22) and the downstream of a water pump (24) through a third valve (21);

the foam supply unit comprises a foam liquid tank, a sixth valve (31), a seventh valve (32) and a foam liquid pump (33); an outlet of the foam liquid tank is sequentially connected with a seventh valve (32), a foam liquid pump (33) and a sixth valve (31) along the flow direction of the foam liquid; the sixth valve (31) is a three-way valve and comprises an output end and a detection end; the output end of the sixth valve (31) is connected with the inlet end of the mixing output unit, and the detection end is connected to the upstream of the seventh valve (32) through a bypass pipe;

the controller controls the opening and closing of the first valve (12) to the seventh valve (32), the air compressor (11), the water pump (24) and the foam liquid pump (33).

8. Compressed air foam fire extinguishing apparatus according to claim 7, characterized in that the method of controlling the compressed air foam fire extinguishing apparatus comprises the steps of: when the compressed air foam fire extinguishing device is in a waiting working state, the controller controls the first valve (12) to be closed, the second valve (13) to be opened, the third valve (21) and the fourth valve (22) to be closed, the fifth valve (23) to be opened, the sixth valve (31) to be communicated with the mixing output unit, and the seventh valve (32) to be closed.

9. The fire extinguishing compressed air foam device according to claim 7, wherein when the fire extinguishing compressed air foam device is in the inspection state, the controller controls the air passage, the water passage and the foam liquid passage one by one according to a set sequence to perform inspection.

10. Compressed air foam fire extinguishing apparatus according to claim 7, characterized in that the mixing output unit comprises a liquid-liquid mixer (41) and a gas-liquid mixer (42); the outlet ends of the fourth valve (22) and the sixth valve (31) are connected with the inlet end of a liquid-liquid mixer (41), the outlet end of the second valve (13) is connected with the inlet end of a gas-liquid mixer (42), and the outlet end of the liquid-liquid mixer (41) is connected with the inlet end of the gas-liquid mixer (42).

Technical Field

The invention relates to the technical field of fire extinguishing device control, in particular to a compressed air foam fire extinguishing device.

Background

A compressed air foam fire-extinguishing technique features that compressed air is introduced to the mixture of foam liquid and water, and after mixing, a foam fire-extinguishing blanket with uniform granularity and not easy to break is formed and adhered to the surface of burning substance and permeated into the burning substance for isolating oxygen and cooling. At present, the compressed air foam fire extinguishing device is applied to the ultra-high voltage converter station of the national grid company Limited, and is an advanced fire extinguishing means capable of remarkably improving the fire fighting capacity of the existing ultra-high voltage converter station.

The compressed air foam fire extinguishing device is complex in equipment composition and needs the cooperation of an air compressor, a water pump, a foam liquid pump and a plurality of valves. If the equipment state is not checked in time at ordinary times and possible fault devices are processed, the reliability of the whole fire extinguishing device can be influenced. If the air compressor, the water pump, the foam liquid pump, a plurality of valves and other devices are checked one by depending on operators, a great deal of labor and time are consumed.

The application number 202020645070.3 discloses an automatic inspection device for fire water fire extinguishing system, which comprises a fire pump and a controller, the fire-fighting water supply system is characterized in that an inlet of a fire pump is connected with a water source through a first stop valve, an outlet of the fire pump is connected with inlets of a main pipe electric butterfly valve and a drainage electric butterfly valve through a second stop valve, an outlet of the main pipe electric butterfly valve is connected with a fire hydrant through a pressure reducing valve, a first flow sensor and a first pressure sensor are arranged on a fire hydrant inlet pipeline, an outlet of the drainage electric butterfly valve is connected with a water outlet through a second flow sensor, a second pressure sensor is arranged on a fire-fighting pump outlet pipeline, signal output ends of the first flow sensor, the second flow sensor, the first pressure sensor and the second pressure sensor are respectively connected with a signal input end of a controller, and a control signal output end of the controller is respectively connected with control signal input ends of the fire pump, the main pipe electric butterfly valve and the drainage electric butterfly valve. The invention has the advantages of low cost, simple structure, easy manufacture and reliable operation. The utility model discloses a mode that adopts actual start-up fire pump detects, actually produces the fire control medium, causes extravagant and to the pollution of all ring edge borders.

Disclosure of Invention

The technical problem to be solved by the invention is how to lack a compressed air foam fire extinguishing device which is simple and easy to operate and does not waste resources in the prior art.

The invention solves the technical problems through the following technical means:

a compressed air foam fire extinguishing device comprises an air supply unit, a water supply unit, a foam supply unit, a mixing output unit and a controller;

the air supply unit comprises an air compressor (11), a first valve (12) and a second valve (13), wherein the outlet end of the air compressor (11) is communicated with the external environment through the first valve (12) and is connected with the inlet end of the gas-liquid mixer (42) through the second valve (13);

the water supply unit comprises a water tank, a third valve (21), a fourth valve (22), a fifth valve (23) and a water pump (24); a fifth valve (23), a water pump (24) and a fourth valve (22) are sequentially connected to the first water outlet of the water tank according to the water flow direction; the fourth valve (22) is connected with the inlet end of the mixing output unit; the second water outlet of the water tank is also connected to the upstream of a fourth valve (22) and the downstream of a water pump (24) through a third valve (21);

the foam supply unit comprises a foam liquid tank, a sixth valve (31), a seventh valve (32) and a foam liquid pump (33); an outlet of the foam liquid tank is sequentially connected with a seventh valve (32), a foam liquid pump (33) and a sixth valve (31) along the flow direction of the foam liquid; the sixth valve (31) is a three-way valve and comprises an output end and a detection end; the output end of the sixth valve (31) is connected with the inlet end of the mixing output unit, and the detection end is connected to the upstream of the seventh valve (32) through a bypass pipe;

the controller controls the opening and closing of the first valve (12) to the seventh valve (32), the air compressor (11), the water pump (24) and the foam liquid pump (33).

The control method comprises the following steps:

step 1, starting an inspection flow of the fire extinguishing device, starting the inspection flow of the compressed air foam fire extinguishing device after a control module receives a starting instruction, and entering step 2;

step 2, opening a bypass first valve (12), and closing a main pipeline second valve (13);

step 3, judging whether the position feedback of the first valve (12) and the second valve (13) is normal or not, if the position feedback is normal, entering step 4, otherwise, sending an air supply unit inspection abnormal alarm, and skipping to step 7;

step 4, starting the first air compressor (11) for a running time T1, and executing step 5;

step 5, closing the first air compressor (11), starting the rest air compressors (11) in sequence, and entering step 6 after running time T1 respectively;

step 6, judging whether the polling of the air compressor (11) is normal, if the polling is normal, entering step 7, if the polling is abnormal, sending an abnormal polling alarm of the air supply unit, and then entering step 7;

step 7, closing the first valve (12), opening the second valve (13), restoring the first valve (12) and the second valve (13) to default positions, finishing the inspection of the air supply unit, and entering step 8;

step 8, opening a third valve (21) and entering a water supply unit for inspection;

step 9, judging whether the third valve (21) is normally opened, if the third valve is normally opened, entering step 10, if the third valve is abnormal, sending out an inspection abnormal alarm of the water supply unit, and skipping to step 15;

step 10, starting a first water pump (24), running time T2, and entering step 11;

step 11, closing the first water pump (24), starting the other water pumps (24) in sequence, closing after the running time T2, and entering step 12;

step 12, judging whether the water pump (24) is in normal polling or not, if the polling is normal, entering step 13, if the polling is abnormal, sending a water supply unit polling abnormal alarm, and skipping to step 15;

step 13, closing the third valve (21), closing the fifth valve (23), opening the fourth valve (22), and inspecting the outlet valve;

step 14, judging whether the position feedback of the third valve (21), the fourth valve (22) and the fifth valve (23) is normal or not, if the position feedback is normal, entering step 15, if the position feedback is abnormal, sending out an inspection abnormal alarm of a water supply unit, and entering step 15;

step 15, closing the third valve (21), closing the fourth valve (22), opening the fifth valve (23), restoring the third valve (21), the fourth valve (22) and the fifth valve (23) to default positions, finishing the inspection of the water supply unit, and entering step 16;

step 16, rotating the sixth valve (31) to an inspection position, and opening the seventh valve (32);

step 17, judging whether the position feedback of the sixth valve (31) and the seventh valve (32) is normal or not, if the position feedback is normal, entering step 18, if the position feedback is abnormal, sending out an inspection abnormal alarm of the foam supply unit, and skipping to step 21;

step 18, starting a first foam liquid pump (33), and carrying out operation time T3;

step 19, closing the first foam liquid pump (33), starting the other foam liquid pumps (33), respectively closing after running time T3, and entering step 20;

step 20, judging whether the polling of the foam liquid pump (33) is normal or not, if the polling is normal, entering step 21, and if the polling is abnormal, sending an abnormal polling alarm of the foam supply unit, and entering step 21;

step 21, closing the seventh valve (32), and turning the sixth valve (31) to a working position;

and step 22, finishing the inspection process.

Through the arrangement of the first valve, the performance of the compressor and the valve can be detected by directly closing the second valve and opening the first valve without external equipment during detection, air is directly discharged into the environment, and the detection is simple and convenient; through the design of the third valve, when in detection, the third valve, the fourth valve, the water pump, the fifth valve and the water tank form a closed loop, the whole water path detection can be completed in the device, external equipment is not needed, and water is not wasted; through the design of sixth valve and seventh valve for sixth valve, seventh valve, foam liquid pump form the closed loop, utilize the foam liquid that persists in the pipeline can realize detecting, and whole testing process is accomplished inside the device, need not the actual foam that produces, practices thrift the cost promptly, can not cause the influence to the periphery again.

The invention detects each part of the gas path, the water path and the foam liquid path in turn, and has high detection precision and simple detection control flow.

Further, the mixing output unit comprises a liquid-liquid mixer (41) and a gas-liquid mixer (42); the outlet ends of the fourth valve (22) and the sixth valve (31) are connected with the inlet end of a liquid-liquid mixer (41), the outlet end of the second valve (13) is connected with the inlet end of a gas-liquid mixer (42), and the outlet end of the liquid-liquid mixer (41) is connected with the inlet end of the gas-liquid mixer (42).

Furthermore, the number of the air compressors (11) is two, the outlet ends of the two air compressors (11) are connected with a second valve (13) through a pipeline, and the first valve (12) is located at the upstream of the second valve (13).

Furthermore, the number of the water pumps (24) is two, and the water outlet ends of the two water pumps (24) are connected with the inlet end of the fourth valve (22) through a pipeline.

Furthermore, the number of the foam liquid pumps (33) is two, the seventh valve (32) is connected with the inlet ends of the two foam liquid pumps (33) through a pipeline, and the outlet ends of the two foam liquid pumps (33) are connected with the sixth valve (31) through a pipeline.

Further, when the fire extinguishing device is in a standby working state, the first valve (12) is closed, and the second valve (13) is opened; the third valve (21) and the fourth valve (22) are closed, and the fifth valve (23) is opened; the sixth valve (31) is communicated with the mixing output unit, and the seventh valve (32) is closed.

Further, the first valve (12) to the seventh valve (32) are all electromagnetic valves.

The invention also provides a compressed air foam fire extinguishing device, which comprises an air supply unit, a water supply unit, a foam supply unit, a mixing output unit and a controller;

the air supply unit comprises an air compressor (11), a first valve (12) and a second valve (13), wherein the outlet end of the air compressor (11) is communicated with the external environment through the first valve (12) and is connected with the inlet end of the gas-liquid mixer (42) through the second valve (13);

the water supply unit comprises a water tank, a third valve (21), a fourth valve (22), a fifth valve (23) and a water pump (24); a fifth valve (23), a water pump (24) and a fourth valve (22) are sequentially connected to the first water outlet of the water tank according to the water flow direction; the fourth valve (22) is connected with the inlet end of the mixing output unit; the second water outlet of the water tank is also connected to the upstream of a fourth valve (22) and the downstream of a water pump (24) through a third valve (21);

the foam supply unit comprises a foam liquid tank, a sixth valve (31), a seventh valve (32) and a foam liquid pump (33); an outlet of the foam liquid tank is sequentially connected with a seventh valve (32), a foam liquid pump (33) and a sixth valve (31) along the flow direction of the foam liquid; the sixth valve (31) is a three-way valve and comprises an output end and a detection end; the output end of the sixth valve (31) is connected with the inlet end of the mixing output unit, and the detection end is connected to the upstream of the seventh valve (32) through a bypass pipe;

the controller controls the opening and closing of the first valve (12) to the seventh valve (32), the air compressor (11), the water pump (24) and the foam liquid pump (33).

Further, the control method of the compressed air foam fire extinguishing device comprises the following steps: when the compressed air foam fire extinguishing device is in a waiting working state, the controller controls the first valve (12) to be closed, the second valve (13) to be opened, the third valve (21) and the fourth valve (22) to be closed, the fifth valve (23) to be opened, the sixth valve (31) to be communicated with the mixing output unit, and the seventh valve (32) to be closed.

Further, when the compressed air foam fire extinguishing device is in an inspection state, the controller controls the air passage, the water passage and the foam liquid passage one by one according to a set sequence to perform inspection.

Further, the mixing output unit comprises a liquid-liquid mixer (41) and a gas-liquid mixer (42); the outlet ends of the fourth valve (22) and the sixth valve (31) are connected with the inlet end of a liquid-liquid mixer (41), the outlet end of the second valve (13) is connected with the inlet end of a gas-liquid mixer (42), and the outlet end of the liquid-liquid mixer (41) is connected with the inlet end of the gas-liquid mixer (42).

The invention has the advantages that:

through the arrangement of the first valve, the performance of the compressor and the valve can be detected by directly closing the second valve and opening the first valve without external equipment during detection, air is directly discharged into the environment, and the detection is simple and convenient; through the design of the third valve, when in detection, the third valve, the fourth valve, the water pump, the fifth valve and the water tank form a closed loop, the whole water path detection can be completed in the device, external equipment is not needed, and water is not wasted; through the design of sixth valve and seventh valve for sixth valve, seventh valve, foam liquid pump form the closed loop, utilize the foam liquid that persists in the pipeline can realize detecting, and whole testing process is accomplished inside the device, need not the actual foam that produces, practices thrift the cost promptly, can not cause the influence to the periphery again.

The invention detects each part of the gas circuit, the water circuit and the foam liquid circuit one by one, has high detection precision and simple detection control flow.

Drawings

FIG. 1 is a schematic view showing the overall construction of a fire extinguishing apparatus according to an embodiment of the present invention;

fig. 2 is a flow chart of detection control of the fire extinguishing apparatus in the embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, the present embodiment provides a compressed air foam fire extinguishing apparatus, which includes an air supply unit, a water supply unit, a foam supply unit, a mixing output unit, a controller;

the air supply unit comprises an air compressor 11, a first valve 12 and a second valve 13, wherein the outlet end of the air compressor 11 is communicated with the external environment through the first valve 12 and is connected with the inlet end of the mixing output unit through the second valve 13; in this embodiment, there are two (but not limited to two) air compressors 11 connected in parallel in the air path, the outlet ends of the two air compressors 11 are connected to a second valve 13 through a pipeline, and the first valve 12 is located upstream of the second valve 13.

The water supply unit comprises a water tank, a third valve 21, a fourth valve 22, a fifth valve 23 and a water pump 24; a fifth valve 23, a water pump 24 and a fourth valve 22 are sequentially connected to the first water outlet of the water tank according to the water flow direction; the fourth valve 22 is connected with the inlet end of the mixing output unit; the second water outlet of the water tank is connected to the upstream of the fourth valve 22 and the downstream of the water pump 24 through the third valve 21; in this embodiment, two (but not limited to two) water pumps 24 are connected in parallel in the air path, and the water outlet ends of the two water pumps 24 are connected with the inlet end of the fourth valve 22 through a pipeline.

The foam supply unit comprises a foam liquid tank, a sixth valve 31, a seventh valve 32 and a foam liquid pump 33; the outlet of the foam liquid tank is sequentially connected with a seventh valve 32, a foam liquid pump 33 and a sixth valve 31 along the flow direction of the foam liquid; the sixth valve 31 is a three-way valve; the outlet end of the sixth valve 31 is connected with the inlet end of the mixing output unit; the sixth valve 31 is also connected upstream of the seventh valve 32 by a bypass pipe; in this embodiment, two (but not limited to two) foam pumps 33 are connected in parallel in the foam pipeline, the seventh valve 32 is connected to the inlet ends of the two foam pumps 33 through a pipeline, and the outlet ends of the two foam pumps 33 are connected to the sixth valve 31 through a pipeline.

The mixing output unit comprises a liquid-liquid mixer 41 and a gas-liquid mixer 42; the outlet ends of the fourth valve 22 and the sixth valve 31 are both connected with the inlet end of a liquid-liquid mixer 41, the outlet end of the second valve 13 is connected with the inlet end of a gas-liquid mixer 42, the outlet end of the liquid-liquid mixer 41 is connected with the inlet end of the gas-liquid mixer 42, and the outlet end of the gas-liquid mixer 42 is used as the output end of the mixing output unit.

In this embodiment, the first valve 12 to the seventh valve 32 are all electromagnetic valves, and the controller controls the opening and closing of the first valve 12 to the seventh valve 32, the air compressor 11, the water pump 24, and the foam liquid pump 33.

When the fire extinguishing device is in a standby working state, the first valve 12 is closed by default, and the second valve 13 is opened by default; the third valve 21 and the fourth valve 22 are closed by default, and the fifth valve 23 is opened by default; the sixth valve 31 is by default in communication with the mixing output unit and the seventh valve 32 is by default closed.

The working principle of the fire extinguishing apparatus in this embodiment is as follows:

when the fire extinguishing device is not in work or overhauled, the second valve 13, the fifth valve 23 and the sixth valve 31 are opened by default, once the controller receives a starting signal, the air compressor 11, the water pump 24 and the foam liquid pump 33 are started immediately, the fourth valve 22 is opened, and foam can be generated and conveyed to the front end.

When needs overhaul, overhaul gas circuit, water route, foam liquid way one by one, specifically do:

when the gas circuit is overhauled, the second valve 13 is closed, the first valve 12 is opened, the air compressor 11 is started, air is discharged to the environment through the first valve 12, and whether the air compressor 11, the first valve 12 and the second valve 13 are normal can be checked without starting the gas-liquid mixer 42;

when the waterway is overhauled, the fourth valve 22 is closed, the third valve 21 and the fifth valve 23 are opened, the water pump 24 is started, water in the water tank returns to the water tank through the fifth valve 23, the water pump 24 and the third valve 21, a closed-loop waterway is formed, and therefore whether the water pump 24 and the third to fifth valves 23 are normal or not can be detected;

when the foam liquid path is overhauled, the sixth valve 31 is turned to the overhauling position, namely, the sixth valve 31 is disconnected with the liquid mixer 41 and communicated with the upstream of the seventh valve 32, the foam liquid pump 33 is started, so that the foam liquid stored in the pipeline returns to the seventh valve 32 through the seventh valve 32, the foam liquid pump 33 and the sixth valve 31 to form a closed-loop pipeline, the foam liquid in the foam liquid tank does not need to be consumed, and the sixth valve 31, the seventh valve 32 and the foam liquid pump 33 can be detected only by using the foam liquid stored in the pipeline.

Whole testing process all goes on inside extinguishing device, need not the actual foam that produces, reduces the cost of overhaul, need not external maintenance equipment, simplifies the maintenance flow. Since the liquid-liquid mixer 41 and the gas-liquid mixer 42 are pure structural devices, opening and closing control is not required, and normal operation can be performed as long as no foreign matter is blocked inside. Since the liquid-liquid mixer 41 and the gas-liquid mixer 42 are located inside the fire extinguishing apparatus, the ability to enter foreign matter inside is extremely small, and therefore, generally, no malfunction occurs and detection is not required.

Correspondingly, as shown in fig. 2, the embodiment provides an inspection method for a compressed air foam fire extinguishing apparatus, which is applied to the fire extinguishing apparatus described above, and it should be emphasized that the inspection of the air path, the water path and the foam liquid path is not in sequence, and the inspection can be performed in sequence according to a set program. The maintenance logic is introduced in the following by taking the gas path, the water path and the foam liquid path as sequences, and other sequences are the same as the inspection logic. The inspection method of the compressed air foam fire extinguishing device comprises the following steps:

step 1, starting an inspection flow of the fire extinguishing device, starting the inspection flow of the compressed air foam fire extinguishing device after a control module receives a starting instruction, and entering step 2;

step 2, opening a bypass first valve 12 and closing a main pipeline second valve 13;

step 3, judging whether the position feedback of the first valve 12 and the second valve 13 is normal or not, if the position feedback is normal, entering step 4, otherwise sending an abnormal inspection alarm of the air supply unit, and skipping to step 7;

step 4, starting the first air compressor 11 for running time T1, and executing step 5;

step 5, closing the first air compressor 11, starting the second air compressor 11, closing the second air compressor 11 after the running time T1, and entering the step 6;

step 6, judging whether the air compressor 11 is in normal polling or not, if the polling is normal, entering step 7, if the polling is abnormal, sending an air supply unit polling abnormal alarm, and then entering step 7;

step 7, closing the first valve 12, opening the second valve 13, restoring the first valve 12 and the second valve 13 to default positions, finishing the inspection of the air supply unit, and entering step 8;

step 8, opening a third valve 21, and entering a water supply unit for inspection;

step 9, judging whether the third valve 21 is normally opened, if the third valve is normally opened, entering step 10, if the third valve is abnormal, sending out an abnormal alarm of the water supply unit inspection, and skipping to step 15;

step 10, starting the first water pump 24, running time T2, and entering step 11;

step 11, turning off the first water pump 24, starting the second water pump 24, turning off the second water pump 24 after the running time T2, and entering step 12;

step 12, judging whether the water pump 24 is in normal inspection, if the inspection is normal, entering step 13, if the inspection is abnormal, sending an inspection abnormal alarm of the water supply unit, and skipping to step 15;

step 13, closing the third valve 21, closing the fifth valve 23, opening the fourth valve 22, and inspecting the outlet valve;

step 14, judging whether the position feedback of the third valve 21, the fourth valve 22 and the fifth valve 23 is normal or not, if the position feedback is normal, entering step 15, if the position feedback is abnormal, sending out an inspection abnormal alarm of a water supply unit, and entering step 15;

step 15, closing the third valve 21, closing the fourth valve 22, opening the fifth valve 23, restoring the third valve 21, the fourth valve 22 and the fifth valve 23 to default positions, finishing the inspection of the water supply unit, and entering step 16;

step 16, rotating the sixth valve 31 to the inspection position, and opening the seventh valve 32;

step 17, judging whether the position feedback of the sixth valve 31 and the seventh valve 32 is normal, if the position feedback is normal, entering step 18, if the position feedback is abnormal, sending an inspection abnormal alarm of the foam supply unit, and jumping to step 21;

step 18, starting the first foam liquid pump 33, and running time T3;

step 19, closing the first foam liquid pump 33, starting the second foam liquid pump 33, closing the second foam liquid pump 33 after the running time T3, and entering the step 20;

step 20, judging whether the polling of the foam liquid pump 33 is normal or not, if the polling is normal, entering step 21, if the polling is abnormal, sending an abnormal polling alarm of the foam supply unit, and entering step 21;

step 21, closing the seventh valve 32, and turning the sixth valve 31 to the working position;

and step 22, finishing the inspection process.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.