CN212262218U - Three-phase jet fire-fighting system - Google Patents
Three-phase jet fire-fighting system Download PDFInfo
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- CN212262218U CN212262218U CN202020602279.1U CN202020602279U CN212262218U CN 212262218 U CN212262218 U CN 212262218U CN 202020602279 U CN202020602279 U CN 202020602279U CN 212262218 U CN212262218 U CN 212262218U
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Abstract
The utility model discloses a three-phase efflux fire extinguishing systems, include: a three-phase jet fire monitor; the first conveying device is used for conveying gas-solid mixed fluid carrying dry powder to the three-phase jet fire monitor during working, and comprises a first conveying pipeline communicated with a first inlet of the three-phase jet fire monitor and a first detection device used for detecting the flow of the dry powder in the conveyed gas-solid mixed fluid; the second conveying device is used for conveying liquid to the three-phase jet fire monitor during operation and comprises a second conveying pipeline communicated with a second inlet of the three-phase jet fire monitor, a second detection device used for detecting the flow of the conveyed liquid and a flow adjusting device used for adjusting the flow of the conveyed liquid; the control device controls the flow regulating device according to the detection results of the first detection device and the second detection device so as to keep the stable ratio of the flow of the liquid to the flow of the dry powder.
Description
Technical Field
The utility model relates to a fire control technical field, in particular to three-phase efflux fire extinguishing system.
Background
The three-phase jet extinguishing technology is a fire extinguishing technology which sprays two or more fire extinguishing agents to a combustion area in a three-phase free turbulent jet mode to stop combustion, and integrates the advantages of various fire extinguishing agents.
In the fire extinguishing process, high-pressure nitrogen blows dry powder out of the dry powder tank and is conveyed to the fire monitor, the gas-solid ratio of the nitrogen and the dry powder is gradually increased, the spraying rate of the dry powder is gradually attenuated, and the flow is gradually reduced, so that the flow ratio fluctuation of a water system fire extinguishing agent and the dry powder emitted by the fire monitor is large, the synergistic fire extinguishing effect of the water system fire extinguishing agent and the dry powder fire extinguishing agent is poor, and the stable and efficient fire extinguishing effect is difficult to maintain.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a three-phase efflux fire extinguishing systems and three-phase efflux fire extinguishing systems's that effect of putting out a fire in coordination control method.
The utility model discloses a three-phase efflux fire extinguishing systems, include:
the three-phase jet flow fire monitor comprises a first inlet for receiving gas-solid mixed fluid and a second inlet for receiving liquid;
the first conveying device is used for conveying gas-solid mixed fluid carrying dry powder to the three-phase jet flow fire monitor and comprises a first conveying pipeline communicated with the first inlet of the three-phase jet flow fire monitor and a first detection device used for detecting the flow rate of the dry powder in the conveyed gas-solid mixed fluid;
the second conveying device is used for conveying liquid to the three-phase jet fire monitor and comprises a second conveying pipeline communicated with a second inlet of the three-phase jet fire monitor, a second detection device used for detecting the flow of the conveyed liquid and a flow adjusting device used for adjusting the flow of the conveyed liquid;
a control device in signal connection with the first detection device, the second detection device, and the flow regulation device, configured to: and controlling the flow regulating device according to the detection results of the first detection device and the second detection device so as to keep the stable ratio of the flow of the liquid to the flow of the dry powder.
In some embodiments, the first conveying device comprises a gas cylinder filled with compressed gas and a dry powder tank filled with dry powder, a gas outlet of the gas cylinder is connected with a gas inlet of the dry powder tank, a powder outlet of the dry powder tank is connected with the first conveying pipeline, and the first detecting device comprises a quality detecting device for detecting the quality of the dry powder tank.
In some embodiments, the first detection device comprises a powder flowmeter arranged on the pipeline of the first conveying device.
In some embodiments, the flow regulating device comprises a variable displacement pump for pumping liquid to the second delivery line.
In some embodiments, the second delivery device comprises a foam tank and a venturi tube, an inlet and an outlet of the variable pump are respectively connected with a water inlet of the second delivery device and a second delivery pipeline, a main inlet and a main outlet of the venturi tube are respectively connected with an outlet and an inlet of the variable pump, and a side suction port of the venturi tube is connected with a tank outlet of the foam tank.
In some embodiments, the main inlet of the venturi tube is connected with a connecting pipeline between the outlet of the variable pump and the second conveying pipeline through a first stop valve, and a flow control valve is arranged on the connecting pipeline between the side suction port of the venturi tube and the tank outlet of the foam tank.
In some embodiments, a second stop valve is arranged on a connecting pipeline between the outlet of the variable pump and the tank outlet of the foam tank.
Based on the utility model provides a three-phase efflux fire extinguishing system, through setting up first detection device and detecting to the gas-solid mixed fluid of three-phase efflux fire gun transport in the flow of dry powder and the flow of the liquid that the second detection device detected the transport, then make the flow of liquid and the flow ratio of dry powder stable through controlling means according to the flow of testing result control flow adjusting device regulating fluid to can make the liquid in the fire extinguishing agent that three-phase efflux fire gun jetted out and the mass ratio of dry powder stable, maintain the reliable efficient synergistic fire extinguishing effect of fire extinguishing agent who jets out.
Based on the utility model provides a control method of three-phase efflux fire extinguishing systems also has corresponding beneficial effect.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:
fig. 1 is the utility model discloses three-phase efflux fire extinguishing systems's structure principle sketch map.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
As shown in fig. 1, the three-phase jet fire-fighting system of the present embodiment includes a three-phase jet fire-fighting monitor 3, a first delivery device 1, a second delivery device 2, and a control device.
The three-phase jet fire monitor 3 comprises a first inlet for receiving a gas-solid mixed fluid and a second inlet for receiving a liquid during operation.
The first conveying device 1 is used for conveying gas-solid mixed fluid carrying dry powder to the three-phase jet flow fire monitor 3 during working, and the first conveying device 1 comprises a first conveying pipeline communicated with a first inlet of the three-phase jet flow fire monitor 3 and a first detection device used for detecting the flow rate of the dry powder in the conveyed gas-solid mixed fluid. The first transportation device 1 may include various devices such as transportation pipes, tanks, valves, and detection devices. During fire extinguishing, dry powder is conveyed from the first conveying device 1 to the three-phase jet fire monitor 3 and needs to be conveyed by gas, common gas comprises nitrogen, compressed air and the like, and the gas carrying the dry powder and the carried dry powder form gas-solid mixed fluid. The first detection device detects the flow of the dry powder conveyed to the three-phase jet fire monitor 3 by the first relation 1 during the fire extinguishing work.
The second conveying device 2 is used for conveying liquid to the three-phase jet fire monitor 3 during operation, and the second conveying device 2 comprises a second conveying pipeline communicated with a second inlet of the three-phase jet fire monitor 3, a second detection device used for detecting the flow of the conveyed liquid and a flow adjusting device used for adjusting the flow of the conveyed liquid. The second conveyor 2 may comprise a variety of devices as the first conveyor 1. During fire fighting operations, the second delivery device 2 delivers a liquid, such as water or foam concentrate, to the three-phase jet monitor 3. The second detecting means is used to detect the flow rate of the liquid being delivered, and in the embodiment shown in fig. 1, the second detecting means is a liquid flow rate detecting means 216. The flow rate regulating device is used for regulating the flow rate of the liquid delivered by the second delivery device 2 to the three-phase fluidic fire monitor 3, and in the embodiment shown in fig. 1, the flow rate regulating device is a variable pump 23, and in some embodiments not shown in the drawings, the flow rate regulating device can also be a flow rate valve such as a speed regulating valve.
The control device is in signal connection with the first detection device, the second detection device and the flow regulating device and is configured to: and controlling the flow regulating device according to the detection results of the first detection device and the second detection device so as to keep the stable ratio of the flow of the liquid to the flow of the dry powder. Maintaining a stable ratio means that the ratio of the flow rate of the liquid to the flow rate of the dry powder is maintained at a constant value or within a small interval.
The three-phase efflux fire extinguishing system of this embodiment, detect the flow of the dry powder in the gas-solid mixed fluid who carries to three-phase efflux fire monitor 3 and the flow of the liquid that the second detection device detected the transport through setting up first detection device, then the flow that makes liquid and the flow ratio of dry powder are stable according to the flow of testing result control flow adjusting device regulation liquid through controlling means, thereby can make the liquid in the fire extinguishing agent that three-phase efflux fire monitor 3 jetted out and the mass ratio of dry powder stable, maintain the reliable efficient synergistic fire extinguishing effect of the fire extinguishing agent who jets out.
In some embodiments, the liquid is water and the ratio of the flow rate of the liquid to the flow rate of the dry powder is 5.6L/kg to 6.7L/kg. Research shows that the synergistic fire extinguishing effect of the water and the dry powder in the flow ratio range is remarkable.
In some embodiments, as shown in fig. 1, the first conveying device 1 comprises a gas cylinder 11 filled with compressed gas and a dry powder tank 12 filled with dry powder, a gas outlet of the gas cylinder 11 is connected with a gas inlet of the dry powder tank 12, a powder outlet of the dry powder tank 12 is connected with a first conveying pipeline of the first conveying device 1, and the first detecting device comprises a quality detecting device 121 for detecting the quality of the dry powder tank. The compressed gas may be compressed air, compressed nitrogen, or the like, and in the illustrated embodiment is compressed nitrogen. After a stop valve between the gas cylinder 11 and the dry powder tank 12 is opened, nitrogen is discharged from a gas outlet of the gas cylinder 11 and enters from a gas inlet of the dry powder tank 12 to blow dry powder in the dry powder tank 12, so that the dry powder in the tank is fluidized and discharged from a powder outlet of the dry powder tank 12. The quality detection device 121 detects the quality of the dry powder tank 12 in real time, the quality of the dry powder tank 12 is continuously reduced along with the continuous output of the dry powder, and the control device can obtain the flow rate of the dry powder according to the change rate of the quality of the dry powder tank 12 detected by the quality detection device 121.
In some embodiments, not shown in the figures, the first detection means comprise a powder flowmeter arranged in the conduit of the first conveyor 1. The powder flowmeter can directly measure the solid flow in the first conveying device, so that the flow of the dry powder can be directly measured.
In some embodiments, the flow regulating means comprise a variable pump 23 for pumping liquid to the second outlet of the second delivery device 2. The liquid flow is adjusted through the variable pump 23, and the liquid flow adjusting device is convenient, reliable and easy to control. As shown in FIG. 1, the three-phase jet fire-fighting system may include a water tank 22, a tank outlet of the water tank 22 is connected to an inlet of a variable pump 23, the variable pump 23 pumps water directly from the water tank 22 when operating, the three-phase jet fire-fighting system may further include an external port 212 connected to the inlet of the variable pump 23, and the variable pump 23 pumps water by communicating with an external water source through the external port 212 when operating.
In some embodiments, as shown in fig. 1, the second delivery device 2 comprises a foam tank 22 and a venturi tube 24, an inlet of the variable pump 23 is connected to a water inlet of the second delivery device 2, an outlet and an inlet of the variable pump 23 are connected to a main inlet and a main outlet of the venturi tube 24, respectively, and a side suction port of the venturi tube 24 is connected to a tank outlet of the foam tank 22. During fire fighting operations, a portion of the liquid pumped by the variable displacement pump 23 from its outlet may enter the venturi 24 from the primary inlet of the venturi 24 as shown in fig. 1, and then exit the primary outlet of the venturi 24, back to the inlet of the variable displacement pump 23, as the liquid enters and exits the venturi 24, it first decelerates through a tapered section, then decelerates through a diverging section, negative pressure is generated during the process from the liquid entering the venturi tube 24 from the main inlet to the liquid flowing out from the main outlet, the side suction port of the venturi tube 24 will suck the foam raw liquid from the tank outlet of the foam tank 22 to the venturi tube 24, the liquid is mixed, namely, the foam stock solution is mixed with the water pumped by the variable pump 23 to form foam solution which is pumped into the three-phase jet fire monitor 3, and the gas-solid mixed fluid conveyed by the first conveying device 1 is sprayed out from the three-phase jet fire monitor 3 together to form a three-phase jet fire extinguishing agent for extinguishing a fire source. The three-phase jet fire-fighting system of this embodiment can realize the synergistic fire extinguishing effect of dry powder and foam concentrate, can exert the advantage that foam cooling covers, separation oxygen and prevent the after combustion when the good efficiency of putting out a fire of performance dry powder when blowout is put out a fire. The foam stock solution has great viscidity, if directly set up the pump and mix after the foam pumps, block up the pump easily to the suction flow to the foam stock solution has been restricted. This embodiment is through setting up venturi 24 and producing negative pressure effect and drawing and mixing foam stoste, helps reducing the jam of variable pump 23, can realize drawing the great flow of foam stoste.
In some embodiments, a first stop valve 214 is disposed on a connecting pipeline between the outlet of the variable pump 23 and the connecting pipeline of the second conveying device 2 and the main inlet of the venturi tube 24, that is, the first stop valve 214 does not affect the liquid conveying from the variable pump 23 to the second conveying pipeline of the second conveying device 2, and can control the variable pump 23 to pump the liquid to the main inlet of the venturi tube 24. A flow control valve 223 is provided between the side suction of the venturi 24 and the tank outlet of the foam tank 22. The second delivery device 2 can deliver water into the three-phase jet fire monitor 3 by closing the first shut-off valve 214 so that the liquid pumped by the variable displacement pump 23 does not enter the venturi tube 24 and thus does not draw the foam concentrate from the foam tank 22. The second conveying device 2 can also convey the foam liquid mixed with the foam liquid into the three-phase jet fire monitor 3 by opening the first stop valve 214 to enable the liquid pumped by the variable pump 23 to enter the venturi tube 24 to extract the foam liquid in the foam tank 22. The flow control valve 223 is provided to adjust the suction flow rate of the foam raw liquid.
In some embodiments, the outlet of the variable displacement pump 23 is connected to the tank outlet of the foam tank 22 by a second shut-off valve 224. The second stop valve 224 is provided to enable the foam tank 22 to be cleaned by pumping water by the variable displacement pump 23 by opening the second stop valve 224 when the three-phase jet fire extinguishing system is not in fire extinguishing operation.
In some embodiments, the control device described above can be a general purpose Processor, a Programmable Logic Controller (PLC), a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable Logic device, discrete Gate or transistor Logic device, discrete hardware components, or any suitable combination thereof for performing the functions described herein.
In some embodiments, a method of controlling a three-phase jet fire protection system is disclosed, comprising:
detecting the flow rate of dry powder in the gas-solid mixed fluid conveyed to the three-phase jet fire monitor 3 and the flow rate of liquid conveyed to the three-phase jet fire monitor 3;
the flow of the liquid is adjusted to keep the stable ratio of the flow of the liquid to the flow of the dry powder.
In some embodiments, detecting the flow rate of the dry powder in the gas-solid mixed fluid delivered to the three-phase jet fire monitor 3 comprises detecting the change of the mass of a dry powder tank for delivering the dry powder to the three-phase jet fire monitor 3 with time, and obtaining the flow rate of the dry powder according to the detection result; or the step of detecting the flow rate of the dry powder in the gas-solid mixed fluid conveyed to the three-phase jet fire monitor 3 comprises the step of detecting the flow rate of the dry powder by using a powder flowmeter.
The operation of one embodiment of the present invention is illustrated below.
As shown in fig. 1, the three-phase jet fire-fighting system of the present embodiment includes a three-phase jet fire-fighting monitor 3, a first delivery device 1, a second delivery device 2, and a control device. The first delivery device 1 comprises first detection means and the flow regulation means is a variable displacement pump 23. The first conveying device 1 comprises a gas cylinder 11 filled with compressed nitrogen and a dry powder tank 12 filled with dry powder, and the first detection device comprises a quality detection device 121. A powder outlet stop valve 124 is arranged between the powder outlet of the dry powder tank 12 and the first conveying pipeline of the first conveying device 1, and the dry powder tank 12 further comprises an air release port connected with the air release stop valve 123. The pipeline between the gas cylinder 11 and the gas inlet of the dry powder tank 12 and the pipeline between the powder outlet of the dry powder tank 12 and the first conveying pipeline are connected through a purge stop valve 125. A second safety valve 122 is also arranged between the gas cylinder 11 and the gas inlet of the dry powder tank 12.
The second conveying device 2 comprises a water tank 22, a foam tank 21 and a variable pump 23, a first butterfly valve 211 used for controlling the opening degree of a pipeline is arranged between the tank outlet of the water tank 22 and the inlet of the variable pump 23, and the second conveying device 2 further comprises an outer interface 212 connected with the inlet of the variable pump 23. A check valve 213, a first safety valve 213, a second butterfly valve 215 for controlling the opening degree of the pipeline, and a liquid flow rate detection device 216 are further disposed between the outlet of the variable pump 23 and the second delivery pipe of the second delivery device 2, and the first safety valve is an overflow valve. The second delivery device 2 further comprises a venturi tube 24, the outlet and inlet of the variable pump 23 are connected with the main inlet and main outlet of the venturi tube 24, respectively, and the side suction port of the venturi tube 24 is connected with the tank outlet of the foam tank 22. A foam flow meter 222 for detecting the flow of the foam stock solution is also arranged between the side suction port of the venturi tube 24 and the tank outlet of the foam tank 22. A first stop valve 225 is arranged on a connecting pipeline between the outlet of the variable pump 23 and a connecting pipeline of a second conveying pipeline of the second conveying device 2 and a main inlet of the Venturi tube 24, and a flow control valve 223 is arranged between a side suction port of the Venturi tube 24 and a tank outlet of the foam tank 22. The outlet of the variable displacement pump 23 is connected to the tank outlet of the foam tank 22 via a second shut-off valve 224. The primary inlet of the venturi 24 is also connected to the tank outlet of the foam tank 22 by a second shut-off valve 224. A foam tank outlet stop valve 221 is also arranged between the tank outlet of the foam tank 22 and the side suction port of the venturi tank 24.
When the fire extinguishing work is carried out, when the gas-solid mixture of the first conveying device 1 enters the three-phase jet fire monitor 3, the purging stop valve 125 and the air discharging stop valve 123 are closed, the stop valve between the gas cylinder 11 and the dry powder tank 12 and the rear powder discharging stop valve 124 are opened, nitrogen is discharged from the gas outlet of the gas cylinder 11, the nitrogen enters from the gas inlet of the dry powder tank 12, dry powder in the dry powder tank 12 is blown, the dry powder in the tank is fluidized, the nitrogen is discharged from the powder outlet of the dry powder tank 12, and the nitrogen enters the first inlet of the three-phase jet fire monitor 3 through the first conveying pipeline of the first conveying device 1 through the powder discharging stop valve 124. The mass detection device 121 detects the mass of the dry powder tank 12 in real time, and the control device can obtain the flow rate of the dry powder according to the mass change rate of the dry powder tank 12 detected by the mass detection device 121. When the second delivery device 2 delivers the foam liquid to the three-phase jet fire monitor 3, the first butterfly valve 211, the second butterfly valve 215, the first stop valve 225, the second stop valve 224, and the flow control valve 223 are all opened, and the second stop valve 224 is closed. The inlet of the variable pump 23 draws water from the water tank 22 and discharges the water from the outlet, one part of the discharged liquid enters the three-phase jet fire monitor 3 through the second butterfly valve 215 and then through the second conveying pipeline of the second conveying device 2, the other part of the discharged liquid enters the main inlet of the venturi tube 24 through the first stop valve 225, the foam raw liquid of the foam tank 21 enters the side suction port of the venturi tube 24 through the second stop valve 224 and the flow control valve 223 and is mixed with the liquid entering from the main inlet of the venturi tube 24, and then the foam raw liquid is discharged from the main outlet of the venturi tube 24 and enters the inlet of the variable pump 23.
When the three-phase jet fire-fighting system does not perform fire extinguishing work, the first conveying device 1 can also realize that nitrogen purges the pipeline of the first conveying device 1 by opening the purging stop valve 125 and the powder outlet stop valve 124, and the gas release stop valve 123 is opened to release the nitrogen remained in the dry powder tank 123.
The second delivery device 2 can also open the second stop valve 224 to enable the variable pump 23 to pump water into the foam tank 22, so as to clean the foam tank 22.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.
Claims (7)
1. A three-phase jet fire protection system, comprising:
the three-phase jet flow fire monitor (3) comprises a first inlet for receiving gas-solid mixed fluid and a second inlet for receiving liquid;
the first conveying device (1) is used for conveying gas-solid mixed fluid carrying dry powder to the three-phase jet flow fire monitor (3), and the first conveying device (1) comprises a first conveying pipeline communicated with the first inlet of the three-phase jet flow fire monitor (3) and a first detection device used for detecting the flow rate of the dry powder in the conveyed gas-solid mixed fluid;
a second delivery device (2) for delivering a liquid to the three-phase jet fire monitor (3), the second delivery device (2) comprising a second delivery line communicating with a second inlet of the three-phase jet fire monitor (3) and a second detection device for detecting the flow of the delivered liquid and a flow regulation device for regulating the flow of the delivered liquid;
a control device in signal connection with the first detection device, the second detection device, and the flow regulation device, configured to: and controlling the flow regulating device according to the detection results of the first detection device and the second detection device so as to keep the stable ratio of the flow of the liquid to the flow of the dry powder.
2. A three-phase jet fire fighting system as defined in claim 1, characterized in that the first conveying device (1) comprises a gas cylinder (11) containing compressed gas and a dry powder tank (12) containing dry powder, the gas outlet of the gas cylinder (11) being connected to the gas inlet of the dry powder tank (12), the powder outlet of the dry powder tank (12) being connected to the first conveying line, the first detection device comprising a quality detection device (121) for detecting the quality of the dry powder tank (12).
3. A three-phase jet fire fighting system as defined in claim 1, characterized in that the first detection device comprises a powder flow meter arranged on the pipe of the first conveyor (1).
4. A three-phase jet fire fighting system as defined in claim 1, characterized in that the flow regulating device comprises a variable displacement pump (23) for pumping liquid to the second delivery line.
5. A three-phase jet fire fighting system as defined in claim 4, characterized in that the second conveying device (2) comprises a foam tank (22) and a venturi tube (24), the inlet and outlet of the variable pump (23) being connected to the water inlet of the second conveying device (2) and to the second conveying line, respectively, the main inlet and main outlet of the venturi tube (24) being connected to the outlet and inlet of the variable pump (23), respectively, the side suction of the venturi tube (24) being connected to the tank outlet of the foam tank (22).
6. A three-phase jet fire fighting system as defined in claim 5, characterized in that the main inlet of the venturi tube (24) is connected to the connection between the outlet of the variable displacement pump (23) and the second delivery line via a first shut-off valve (225), and a flow control valve is provided on the connection between the side suction port of the venturi tube (24) and the tank outlet of the foam tank (22).
7. A three-phase jet fire fighting system as defined in claim 6, characterized in that a second shut-off valve (224) is provided on the tank outlet connection pipe of the outlet of the variable displacement pump (23) and the foam tank (22).
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| CN111359127A (en) * | 2020-04-21 | 2020-07-03 | 徐工集团工程机械股份有限公司 | Three-phase jet fire-fighting system and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111359127A (en) * | 2020-04-21 | 2020-07-03 | 徐工集团工程机械股份有限公司 | Three-phase jet fire-fighting system and control method thereof |
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