A compressed air foam extinguishing system

Abstract

The application discloses a compressed air foam fire extinguishing system, which comprises a mixing tank, a foam input pipeline, a water input pipeline, a mixed liquid output pipeline and a mixing mechanism arranged in the mixing tank. One end of the foam input pipeline and the water input pipeline is respectively connected into the mixing tank, and the other end of the foam input pipeline and the water input pipeline is respectively connected with an external foam storage tank and an external water source. One end of the mixed liquid output pipeline is inserted into the mixing tank below the liquid level of the mixed liquid, and the other end of the mixed liquid output pipeline is connected with a fire-fighting pipeline network. In the application, the input of the water input pipeline can drive the stirring assembly to rotate around the axis of the stirring assembly, so that the water input into the mixing tank through the water input pipeline is stirred when the water is mixed with the foam, the stirring of the foam and the water is realized at the same time of the liquid injection, compared with the prior art of injecting liquid first and then stirring, the preparation time of the mixed liquid is saved, and meanwhile, external driving is not needed, and the production cost is saved.

Description

Technical Field

[0001] This invention relates to the field of foam fire extinguishing technology, and more specifically to a compressed air foam fire extinguishing system. Background Technology

[0002] The air pressure in my country's high-altitude regions is relatively low. For example, the atmospheric pressure on the Qinghai-Tibet Plateau is 600-700 mmHg, with an average altitude of 3,000 meters, which is about 150 mmHg lower than the standard atmospheric pressure. Under such extreme temperature and environmental pressure, the physical properties of compressed air foam will be affected, posing a great challenge to the normal operation of foam generating devices, conveying devices, and spraying devices.

[0003] A compressed air foam fire extinguishing system, as described in application number CN202111456442.3, includes a foam mixture processing mechanism, a compressed air supply device, a foam generating device, and a fire protection pipe network. The foam mixture processing mechanism is connected to the foam generating device via a pipe; the compressed air supply device is connected to the foam generating device via a pipe; and the foam generating device is connected to the fire protection pipe network via a pipe. In this system, the foam mixture processing mechanism first mixes foaming agent and water to obtain a foam mixture. Then, the foam generating device mixes compressed air with the foam mixture. The compressed air and foam mixture are mixed and foamed at this point to produce stable foam. Using compressed air as the power source for the fire extinguishing foam results in low manufacturing costs, convenient equipment maintenance, high foam stability, and good fire extinguishing effect, facilitating rapid fire suppression in the event of a fire.

[0004] The aforementioned systems often involve adding foam and fire-fighting water together before mixing and spraying them for fire extinguishing. This adds an extra mixing step before extinguishing the fire and requires an external drive to power the mixing device to achieve the mixing of foam and fire-fighting water. When extinguishing a fire in an emergency, adding foam and fire-fighting water first and then mixing may result in excessively long preparation time for the mixture or uneven mixing or even failure to mix, affecting the final fire extinguishing effect and efficiency. Summary of the Invention

[0005] The technical problem to be solved by this invention is how to achieve mixing of foam and fire-fighting water while injecting liquid.

[0006] This invention solves the above-mentioned technical problems through the following technical means: a compressed air foam fire extinguishing system, comprising a mixing tank, a foam input pipeline, a water input pipeline, a mixed liquid output pipeline, and a mixing mechanism disposed within the mixing tank. One end of the foam input pipeline and the water input pipeline are respectively connected to the mixing tank, and the other end is respectively connected to an external foam storage tank and an external water source. One end of the mixed liquid output pipeline extends below the liquid surface of the mixed liquid in the mixing tank, and the other end is connected to a fire protection pipe network. The mixing mechanism includes several stirring components, a spiral blade, and guide plates. The stirring components are rotatably connected within the mixing tank, and a spiral blade is fixedly connected along its axial direction. One end of the water input pipeline connected to the mixing tank faces the spiral blade and can drive the stirring components to rotate around its axis. Several guide plates are provided at the end of the spiral blade facing the output end of the water input pipeline.

[0007] The water input through the water inlet pipe drives the stirring component to rotate around its axis, allowing water to be introduced into the mixing tank and mixed with the foam while stirring. This achieves simultaneous mixing of foam and water during liquid injection, saving preparation time compared to the existing technology that injects liquid first and then stirs. It also eliminates the need for external drive, thus reducing production costs.

[0008] As a preferred technical solution, a water inlet pipe is fixedly connected inside the mixing tank. One end of the water inlet pipe is connected to the end of the water input pipeline that enters the mixing tank, and the other end of the water inlet pipe is connected to a water distribution plate. Multiple high-pressure nozzles are connected through the water distribution plate, and the projections of several guide plates on the water distribution plate correspond to the multiple high-pressure nozzles in sequence.

[0009] As a preferred technical solution, the stirring assembly includes a rotating rod and a stirring rod. The rotating rod is rotatably connected inside the mixing tank, and multiple staggered stirring rods are fixedly connected to the rotating rod circumferentially. The stirring rods of adjacent stirring assemblies are staggered.

[0010] As a preferred technical solution, a distribution plate is fixedly connected inside the mixing tank. The distribution plate is connected to one end of the foam input pipeline that enters the mixing tank, and multiple foam outlet holes are arranged on the distribution plate.

[0011] As a preferred technical solution, the mixed liquid output pipeline includes an outlet pipe, and the outlet pipe is equipped with a flow control valve group, which can adjust its opening degree.

[0012] As a preferred technical solution, a baffle is fixedly connected to the inside of the liquid outlet pipe along its axial direction, and a flow hole is opened on the baffle. The flow control valve assembly includes a flow limiting block that can move in a direction perpendicular to the axis of the liquid outlet pipe. A lead screw linear module is also fixedly connected to the outside of the liquid outlet pipe. The output end of the lead screw linear module is connected to the flow limiting block and can drive the flow limiting block to move toward or away from the flow hole.

[0013] As a preferred technical solution, the fire protection pipeline includes an adjustment mechanism, which includes a mounting base, a drive mechanism, and a nozzle located at one end of the mounting base. The nozzle is rotatably connected to the mounting base, and the drive mechanism can drive the nozzle to rotate relative to the mounting base. The nozzle is also connected to the mixed liquid output pipeline through a telescopic corrugated pipe.

[0014] As a preferred technical solution, the nozzle includes two rotating nozzles, which are symmetrically arranged about the center line of the mounting base. The driving mechanism includes a bidirectional electric push rod. Two connecting rods are rotatably connected inside the mounting base. One end of each connecting rod is fixedly connected to a rotating nozzle, and the other end has a waist hole. The mounting base has a through hole adapted to the rotating nozzle. The two telescopic ends of the bidirectional electric push rod are respectively fixed with protrusions, which extend into the waist hole.

[0015] As a preferred technical solution, the nozzle further includes a fixed nozzle, which is fixedly disposed in the middle of the mounting base, and a rubber sheet is provided inside the through hole to cover the outside of the rotating nozzle.

[0016] As a preferred technical solution, it also includes a foam extinguishing agent storage tank, a water storage tank, a vacuum pump, and an air supply device. The foam extinguishing agent storage tank and the water storage tank are respectively connected to the foam input pipeline and the water input pipeline. The vacuum pump is located downstream of the mixed liquid output pipeline and is connected to the air supply device.

[0017] The advantages of this invention are:

[0018] (1) In this invention, the input of water into the water inlet pipe can drive the stirring component to rotate around its axis, so that water is input into the mixing tank through the water inlet pipe and mixed with foam for stirring. This realizes the stirring of foam and water at the same time as liquid injection. Compared with the prior art of injecting liquid first and then stirring, it saves the preparation time of the mixture and does not require external drive, thus saving production costs.

[0019] (2) In this invention, by providing a flow control valve group on the liquid outlet pipe, the flow control valve group can adjust its opening degree and control the outlet size of the flow hole when liquid is discharged from the liquid outlet pipe. In this way, the amount of liquid discharged can be flexibly controlled according to the size of the required fire extinguishing range, avoiding unnecessary waste, and avoiding the problem of large-scale liquid discharge interfering with and damaging the converter station equipment that has not caught fire.

[0020] (3) In this invention, by setting a rotating nozzle that can rotate and a fixed nozzle that is fixed on the mounting base, the fire head can be controlled to perform directional spraying work according to the requirements of the environment and site. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the internal structure of the mixing tank provided in an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the stirring assembly structure provided in an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the internal structure of the flow control valve assembly provided in an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the current limiting block structure provided in an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the adjustment mechanism structure provided in an embodiment of the present invention;

[0027] Icon labels:

[0028] 1. Mixing tank; 2. Foam extinguishing agent storage tank; 3. Water storage tank; 4. Vacuum pump; 5. High-pressure gas supply device; 6. Mixing mechanism; 601. Distribution plate; 602. Foam tube; 603. Foam outlet; 604. Water inlet pipe; 605. Water distribution plate; 606. High-pressure nozzle; 607. Bearing; 608. Rotating rod; 609. Spiral blade; 610. Guide plate; 611. Stirring rod; 7. Flow control valve assembly; 701. Liquid outlet pipe; 702. Flow hole; 703. Flow limiting block; 704. Push rod; 705. Screw; 706. Gear motor; 707. Limiting guide rod; 8. Adjusting mechanism; 801. Mounting base; 802. Bidirectional electric push rod; 803. Connecting rotating rod; 804. Rotating base; 805. Nozzle; 806. Connecting pipe; 807. Rubber sheet. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] See Figure 1 A compressed air foam fire extinguishing system includes a mixing tank 1, a foam input pipeline, a water input pipeline, a mixed liquid output pipeline, and a mixing mechanism 6 disposed in the mixing tank 1. One end of the foam input pipeline and the water input pipeline are respectively connected to the mixing tank 1, and the other end is respectively connected to an external foam storage tank and an external water source. One end of the mixed liquid output pipeline extends below the liquid surface of the mixed liquid in the mixing tank 1, and the other end is connected to the fire protection pipe network. The mixing mechanism 6 includes several stirring components, a spiral blade 609, and a guide plate 610. The stirring components are rotatably connected in the mixing tank 1, and the spiral blade 609 is fixedly connected along its axis. One end of the water input pipeline connected in the mixing tank 1 is set towards the spiral blade 609 and can drive the stirring components to rotate around its axis. Several guide plates 610 are provided at the end of the spiral blade 609 facing the output end of the water input pipeline.

[0031] It should be noted that the compressed air foam fire extinguishing system in this embodiment can be connected to the fire protection pipeline network of the UHV converter station, but is not limited thereto. The foam input pipeline includes a foam pipe 602, the mixed liquid output pipeline includes an outlet pipe 701, the external foam storage tank is a foam extinguishing agent storage tank 2, the external water source can be a water storage tank 3, and a vacuum pump 4 is also provided downstream of the mixed liquid output pipeline to extract the mixed liquid in the mixing tank 1 to the fire protection pipeline network. The vacuum pump 4 is also connected to an air supply device.

[0032] See Figure 2 , Figure 3 The mixing mechanism 6 also includes a distribution plate 601, a water inlet pipe 604, a water distribution plate 605, a high-pressure nozzle 606, a bearing 607, a rotating rod 608, and a stirring rod 611. The water inlet pipe 604 is fixedly connected inside the mixing tank 1. One end of the water inlet pipe 604 is connected to the end of the water input pipeline that enters the mixing tank 1. The other end of the water inlet pipe 604 is connected to the water distribution plate 605, and multiple high-pressure nozzles 606 are connected through the water distribution plate 605. In this embodiment, the water distribution plate 605 is disc-shaped, and four high-pressure nozzles 606 distributed at equal angles are fixedly connected to its top. Correspondingly, four guide plates 610 are set at the bottom or top of the spiral blade 609. The projections of the four guide plates 610 on the water distribution plate 605 correspond one-to-one with the four high-pressure nozzles 606, so as to ensure that the high-pressure water ejected through the high-pressure nozzles 606 can drive the spiral blade 609 to rotate.

[0033] In this embodiment, three stirring components are used as an example. The three stirring components can be linearly distributed or circumferentially distributed. The stirring components are composed of a rotating rod 608 and a stirring rod 611. The rotating rod 608 is rotatably connected to the mixing tank 1. In this embodiment, the bottom inner wall of the mixing tank 1 is used as an example. The bottom of the rotating rod 608 is rotatably connected to the top of the water distribution plate 605 through a bearing 607. A cylindrical connecting section is fixed at the top of the water distribution plate 605. The outer ring of the bearing 607 is fixed to the top of the cylindrical connecting section, and its inner ring is fixed to the bottom of the rotating rod 608. However, it is not limited to this. Multiple staggered stirring rods 611 are fixedly connected to the rotating rod 608 in a circumferential direction. The stirring rods 611 of adjacent stirring components are staggered. The axis of the rotating rod 608 is coaxial with that of the water inlet pipe 604.

[0034] A distribution plate 601 is fixedly connected inside the mixing tank 1. The distribution plate 601 is connected to one end of the foam input pipeline that enters the mixing tank 1. The distribution plate 601 is provided with a plurality of foam outlet holes 603 with unidirectional nozzles. In this embodiment, the distribution plate 601 is fixedly located at the bottom of the mixing tank 1. Of course, it can also be located on the inner wall of the mixing tank 1, and is not limited thereto.

[0035] See Figure 4 , Figure 5 The outlet pipe 701 is equipped with a flow control valve assembly 7, which can adjust its opening to control the flow rate of the outlet pipe 701. The flow control valve assembly 7 includes a flow limiting block 703, a push rod 704, a screw 705, a geared motor 706, and a limit guide rod 707. A partition is fixedly connected to the outlet pipe 701 along its axial direction. A flow hole 702 is opened on the partition. The flow limiting block 703 can move in a direction perpendicular to the axis of the outlet pipe 701. A lead screw linear module is also fixedly connected to the outside of the outlet pipe 701. The module housing and the push rod 704 and screw located inside the module housing are also included. 705, a geared motor 706, and a limiting guide rod 707 form a lead screw linear module. The module housing is fixedly connected to the liquid outlet pipe 701. The output end of the geared motor 706 is fixedly connected to a screw 705. The screw 705 is screwed to a push rod 704. The push rod 704 extends into the liquid outlet pipe 701 and is fixed to the flow limiting block 703. It can drive the flow limiting block 703 to move toward or away from the flow hole 702, thereby controlling the size of the flow area of ​​the flow hole 702. The limiting guide rod 707 is fixedly connected inside the module housing. The push rod 704 slides with the limiting guide rod 707.

[0036] See Figure 6The fire protection pipeline network is for the UHV converter station, comprising UHV pipelines and a regulating mechanism 8. The regulating mechanism 8 includes a mounting base 801, a bidirectional electric push rod 802, a connecting rod 803, a rotating base 804, a sprinkler head 805, a connecting pipe 806, and a rubber sheet 807. The sprinkler head 805 includes a fixed sprinkler head and a rotating sprinkler head, which are rotatably connected to the mounting base 801. Both the fixed and rotating sprinkler heads are connected to the mixed liquid output pipeline via the connecting pipe 806, which is a telescopic corrugated pipe. The fixed sprinkler head is fixedly located in the middle of the mounting base 801, and the two rotating sprinkler heads are symmetrically arranged about the centerline of the mounting base 801. Two connecting rods 803 are rotatably connected inside 801. Each connecting rod 803 has a rotating nozzle fixedly connected to one end and a waist hole opened at the other end. The mounting base 801 has a through hole adapted to the rotating nozzle to provide rotation space for the rotating nozzle. The two telescopic ends of the bidirectional electric push rod 802 are respectively fixed with protrusions. The protrusions extend into the waist hole, so that when the telescopic ends of the bidirectional electric push rod 802 are extended, the protrusions slide with the waist hole, thereby driving the connecting rod 803 to rotate, realizing the adjustment of the angle of the rotating nozzle. A rubber sheet 807 is also fixed in the through hole, and the rubber sheet 807 is wrapped around the outside of the rotating nozzle.

[0037] How to use:

[0038] First, the foam extinguishing agent storage tank 2 and the water storage tank 3 are introduced into the mixing tank 1 for mixing. Then, the mixture in the mixing tank 1 is extracted using a vacuum pump 4 or other existing pump sets that can provide negative pressure or suction, as well as a high-pressure gas supply device 5. Subsequently, the foam introduced by the foam pipe 602 is evenly distributed inside the mixing tank 1 through the distribution plate 601 and the foam outlet 603. Water is sprayed into the mixing tank 1 using the water inlet pipe 604, the water distribution plate 605, and the high-pressure nozzle 606. Then, through the spiral blade 609 and the guide plate 610, the rotating rod 608, the spiral blade 609, and the stirring rod 611 are rotated together by the bearing 607 when the fire water is sprayed vertically, so that the mixing process can be carried out simultaneously when adding water and foam. As a preferred embodiment, the mixture can also be mixed with nitrogen gas with a pressure of 0.7 MPa and a flow rate of 55 L / s after treatment to form foam. The foam is transported in the fire protection pipeline network for secondary foaming.

[0039] At this time, the screw 705 is driven to rotate by the geared motor 706, which allows the push rod 704 to push and pull the flow limiting block 703 stably under the directional action of the limit guide rod 707. When liquid is discharged from the liquid outlet pipe 701, the size of the outlet of the flow hole 702 can be controlled. Finally, the push and pull action of the bidirectional electric push rod 802 and the connecting rotating rod 803 can drive the rotating seat 804 to rotate left and right on the mounting seat 801. Finally, the connecting pipe 806 and the fire head 805 are connected to spray water for fire extinguishing.

[0040] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A compressed air foam extinguishing system, characterized in that The mixing tank, foam input pipeline, water input pipeline, mixed liquid output pipeline and mixing mechanism arranged in the mixing tank, one end of the foam input pipeline and water input pipeline is connected to the mixing tank, and the other end is connected to the external foam storage tank and external water source respectively, one end of the mixed liquid output pipeline is inserted into the mixed liquid below the liquid level in the mixing tank, and the other end is connected to the fire fighting pipeline network, the mixing mechanism includes a plurality of stirring assemblies, spiral blades and guide plates, the stirring assembly is rotatably connected in the mixing tank, and the spiral blade is fixedly connected along the axial direction of the stirring assembly, one end of the water input pipeline connected to the mixing tank is arranged towards the spiral blade and can drive the stirring assembly to rotate with the axis as the rotation shaft, one end of the spiral blade towards the output end of the water input pipeline is provided with a plurality of guide plates, a water inlet pipe is fixedly connected in the mixing tank, one end of the water inlet pipe is connected to one end of the water input pipeline connected to the mixing tank, the other end of the water inlet pipe is connected with a water distribution disc, and a plurality of high-pressure nozzles are connected through the water distribution disc, the projections of the plurality of guide plates on the water distribution disc are sequentially corresponding to the plurality of high-pressure nozzles, the stirring assembly includes a rotating rod and a stirring rod, the rotating rod is rotatably connected in the mixing tank, a plurality of stirring rods are fixedly connected to the rotating rod in a staggered manner, and the stirring rods of adjacent stirring assemblies are arranged in a staggered manner, a distribution disc is fixedly connected in the mixing tank, the distribution disc is connected to one end of the foam input pipeline connected to the mixing tank, and a plurality of foam outlet holes are arranged on the distribution disc.

2. A compressed air foam extinguishing system according to claim 1, c h a r a c t e r i s e d in that The mixed liquid output pipeline comprises an outlet pipe, and a flow control valve group is arranged on the outlet pipe.

3. A compressed air foam extinguishing system according to claim 2, c h a r a c t e r i s e d in that A partition plate is fixedly connected to the outlet pipe along the axial direction, a flow-through hole is formed in the partition plate, the flow control valve group comprises a flow limiting block capable of moving in a direction perpendicular to the axis of the outlet pipe, a lead screw linear module is further fixedly connected to the outside of the outlet pipe, the output end of the lead screw linear module is in transmission connection with the flow limiting block, and the flow limiting block can be driven to move towards or away from the flow-through hole.

4. A compressed air foam extinguishing system according to claim 1, c h a r a c t e r i s e d in that The fire fighting pipeline network comprises an adjusting mechanism, the adjusting mechanism comprises a mounting seat, a driving mechanism and a nozzle arranged at one end of the mounting seat, the nozzle is rotatably connected in the mounting seat, the driving mechanism can drive the nozzle to rotate relative to the mounting seat, and the nozzle is connected with the mixed liquid output pipeline through a telescopic corrugated pipe.

5. A compressed air foam extinguishing system according to claim 4, c h a r a c t e r i s e d in that The nozzle comprises two rotating nozzles, the two rotating nozzles are symmetrically arranged about the center line of the mounting seat, the driving mechanism comprises a bidirectional electric push rod, two connecting rotating rods are rotatably connected in the mounting seat, one end of the connecting rotating rod is fixedly connected with the rotating nozzle, the other end is provided with a waist hole, a through hole matched with the rotating nozzle is formed in the mounting seat, and the two telescopic ends of the bidirectional electric push rod are respectively fixed with protrusions which are inserted into the waist hole.

6. A compressed air foam extinguishing system according to claim 5, c h a r a c t e r i s e d in that The nozzle further comprises a fixed nozzle, the fixed nozzle is fixedly arranged in the middle part of the mounting seat, and a rubber sheet is arranged outside the rotating nozzle in the through hole.

7. A compressed air foam extinguishing system according to claim 1, c h a r a c t e r i s e d in that Further comprising a foam extinguishing agent storage tank, a water storage tank, a vacuum pump and a gas supply device, the foam extinguishing agent storage tank and the water storage tank are connected with the foam input pipeline and the water input pipeline respectively, the vacuum pump is arranged downstream of the mixed liquid output pipeline, and the gas supply device is connected.

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