CN216877687U - Self-rotating foam proportioner for CAFS (computer aided design) - Google Patents
Self-rotating foam proportioner for CAFS (computer aided design) Download PDFInfo
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- CN216877687U CN216877687U CN202121440219.5U CN202121440219U CN216877687U CN 216877687 U CN216877687 U CN 216877687U CN 202121440219 U CN202121440219 U CN 202121440219U CN 216877687 U CN216877687 U CN 216877687U
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Abstract
The utility model relates to a self-rotating foam proportioner for CAFS, which has the innovation points that: including water route trunk line, foam stoste entering pipeline, foam stoste surge chamber, spin efflux hybrid tube and mixed liquid output tube, the water route trunk line is linked together with the one end of spin efflux hybrid tube, and the other end and the mixed liquid output tube of spin efflux hybrid tube are linked together, foam stoste surge chamber suit is in the periphery of spin efflux hybrid tube, and foam stoste surge chamber and the inner chamber of spin efflux hybrid tube are linked together, foam stoste entering pipeline and the lateral wall fixed connection of foam stoste surge chamber, and foam stoste entering pipeline is linked together with foam stoste surge chamber. The utility model has no built-in complex spoiler, small flow resistance, and uneasy blockage of the system, the secondary working medium fluid is automatically sucked by the negative pressure formed by the throat part, and does not need a second power source, and can form stable rotational flow, thereby being more suitable for the engineering application of the CFAS fire-fighting system.
Description
Technical Field
The utility model relates to a proportioner, in particular to a self-rotating foam proportioner for CAFS (computer aided design).
Background
At present, compressed air foam fire extinguishing systems (CAFS for short) is a neotype fire control technology of putting out a fire, and its principle is mixed the foam stoste of certain proportion with fire water after again with high-pressure air initiative and foam mixed liquid in the mixing chamber mix and produce even and difficult broken high quality foam, can permeate the comburent fast inside, effectively isolated oxygen and cooling, the fire extinguishing efficiency is high.
The foam proportioner is a core component of the CAFS system, the structure of the foam proportioner determines whether foam stock solution and fire fighting water are sufficiently and uniformly mixed or not, finally determines performance parameters of generated foam, and is a key for directly influencing the fire extinguishing performance of the CAFS system.
Most of foam proportion mixers commonly used in the existing CAFS system are SK, SV and other static mixers summarized in static mixer JB/T7660 and 1995, but the static mixers are extremely complex in structure, large in structural size, high in processing and welding difficulty, complicated in internal turbulence pieces, large in system resistance and easy to block. Therefore, attempts have been made to find a foam proportioner which is simple in construction, small in size and good in passability. The existing foam liquid mixer comprises an upper buffer chamber, a lower buffer chamber and a mixing pipe, wherein the side faces of the upper buffer chamber and the lower buffer chamber are respectively provided with an upper feeding port and a lower feeding port, the pipe walls of the mixing pipe in the upper buffer chamber and the lower buffer chamber are uniformly distributed with a group of jet flow small holes, the central lines of the jet flow small holes and the normal line at the pipe wall form a certain angle, two kinds of working medium fluid respectively flow in from the upper feeding port and the lower feeding port, and flow into an outlet in a rotational flow manner after passing through the jet flow small holes to be quickly and efficiently mixed in the mixing pipe.
However, the technical scheme has obvious disadvantages and is not suitable for the application of the CAFS system, because the fire fighting water flow rate of the CAFS system is generally very large, the fire fighting water flow rate needs to be conveyed through a pipeline with a larger pipe diameter and is not suitable for being mixed through a small jet hole from the side surface, and in the technical scheme, two working fluids need to be pumped into a mixing pipe through a power source, so that the complexity of the system is increased to a certain extent and the reliability of the system is reduced.
SUMMERY OF THE UTILITY MODEL
The purpose of the utility model is: the self-rotating foam proportioner for the CAFS is free of built-in complex spoilers, small in flow resistance, not easy to block a system, capable of enabling secondary working medium fluid to be automatically sucked through negative pressure formed by the throat part, free of a second power source, capable of forming stable rotational flow flowing compared with a jet hole through a jet pipe arranged at a certain angle, and more suitable for CFAS fire protection system engineering application.
In order to achieve the purpose, the technical scheme of the utility model is as follows: a from rotating foam proportioner for CAFS has the innovation points that: including water route trunk line, foam stoste entering pipeline, foam stoste surge chamber, spin efflux hybrid tube and mixed liquid output tube, the water route trunk line is linked together with the one end of spin efflux hybrid tube, and the other end and the mixed liquid output tube of spin efflux hybrid tube are linked together, foam stoste surge chamber suit is in the periphery of spin efflux hybrid tube, and foam stoste surge chamber and the inner chamber of spin efflux hybrid tube are linked together, foam stoste entering pipeline and the lateral wall fixed connection of foam stoste surge chamber, and foam stoste entering pipeline is linked together with foam stoste surge chamber.
In the above technical scheme, spin jet mixing tube is including each other as an organic whole or fixed connection and mutual intercommunication convergent section, larynx pipeline section and divergent section, be equipped with on the larynx pipeline section along its radial and evenly arranged's whirl hole, foam stock solution surge chamber is linked together through whirl hole and spin jet mixing tube's inner chamber, be equipped with the first guiding gutter that is the screw thread form on the inner wall of larynx pipeline section, be equipped with the second guiding gutter that is the screw thread form on the inner wall of whirl hole.
In the technical scheme, an included angle alpha between the center line of the swirl hole of the throat pipe section and the normal line of the inner pipe wall of the throat pipe section is controlled within the range of 15-60 degrees.
In the technical scheme, the outer diameter of the spin jet mixing tube is DN 50-DN 250, and the length proportion relation of the tapered section, the throat section and the divergent section is L1∶L2∶L3＝1∶(1～2)∶(2～3)。
In the above technical solution, the
Wherein L is2Is the length of the throat section of said
Wherein L is4Is the length of the swirl hole.
In the above technical solution, the inner diameter D of the swirl hole1With the inner diameter D of the foam concentrate entering the pipe2The relationship between them is: n x D1≈D2Wherein n is the number of the swirl holes, and n is more than or equal to 2 and less than or equal to 6.
In the above technical solution, the inner diameter D of the throat section3And the inner diameter D of the swirl hole1In betweenThe relationship is as follows:
wherein n is the number of swirl holes, and n is more than or equal to 2 and less than or equal to 6.
In the above technical scheme, the outer side end of the waterway main pipeline is provided with a waterway inlet flange.
In the technical scheme, a foam stock solution inlet flange is arranged at the outer side end of the foam stock solution inlet pipeline.
In the above technical scheme, the outer side end of the mixed liquid output pipe is provided with a mixed liquid outlet flange.
The utility model has the positive effects that: after the self-rotating foam proportioner for the CAFS is adopted, the self-rotating foam proportioner comprises a main waterway pipeline, a foam stock solution inlet pipeline, a foam stock solution buffer chamber, a self-rotating jet mixing pipe and a mixed solution outlet pipe, wherein the main waterway pipeline is communicated with one end of the self-rotating jet mixing pipe, the other end of the self-rotating jet mixing pipe is communicated with the mixed solution outlet pipe, the foam stock solution buffer chamber is sleeved on the periphery of the self-rotating jet mixing pipe and communicated with the inner cavity of the self-rotating jet mixing pipe, the foam stock solution inlet pipeline is fixedly connected with the side wall of the foam stock solution buffer chamber, and the foam stock solution inlet pipeline is communicated with the foam stock solution buffer chamber;
when the self-spinning jet mixing device is used, fire water enters the self-spinning jet mixing pipe from the main waterway pipeline at a certain speed to be depressurized and accelerated to form a negative pressure region and form rotational flow flowing, foam stock solution enters the pipeline from the foam stock solution and flows into the foam stock solution buffer chamber, the foam stock solution is sucked into the self-spinning jet mixing pipe under the action of negative pressure to form rotational flow three-dimensional flowing, two flows of fluid realize high-efficiency turbulent flow action through cross flow and rotational flow, the rapid mixing process between the two flows of fluid is strengthened, and finally the fire water is output through the mixed liquid output pipe; the fire water is depressurized and accelerated in the spinning jet mixing pipe to form a negative pressure area, the foam stock solution is automatically sucked, and a power source at the foam stock solution end is not needed, so that the structure of a CAFS (computer aided design) system is simplified, and the stability of the system is improved, and the fire water self-spinning jet mixing pipe has the advantages that: the built-in complex spoiler does not exist, the flow resistance is small, the system is not easy to block, secondary working medium fluid is automatically sucked through negative pressure formed by the throat part, a second power source is not needed, and a jet pipe arranged at a certain angle can form stable rotational flow compared with a jet hole, so that the system is more suitable for CFAS fire protection system engineering application.
Drawings
FIG. 1 is a schematic structural diagram of one embodiment of the present invention;
FIG. 2 is a schematic sectional view A-A of FIG. 1;
in the figure, 1-a waterway inlet flange, 2-a waterway main pipe, 3-a foam stock solution inlet flange, 4-a foam stock solution inlet pipe, 5-a foam stock solution buffer chamber, 6-a spinning jet flow mixing pipe, 61-a reducing section, 62-a throat pipe section, 63-a gradually expanding section, 64-a spinning hole, 65-a first diversion trench, 66-a second diversion trench, 7-a mixed solution outlet pipe and 8-a mixed solution outlet flange.
Detailed Description
The utility model is further illustrated, but not limited, by the following examples in connection with the accompanying drawings.
As shown in fig. 1 and 2, a CAFS is with from rotating foam proportioner, including water route trunk line 2, foam stoste entering pipeline 4, foam stoste surge chamber 5, spin efflux hybrid tube 6 and mixed liquid output tube 7, water route trunk line 2 is linked together with the one end of spin efflux hybrid tube 6, and the other end and the mixed liquid output tube 7 of spin efflux hybrid tube 6 are linked together, 5 suits of foam stoste surge chamber are in the periphery of spin efflux hybrid tube 6, and foam stoste surge chamber 5 is linked together with the inner chamber of spin efflux hybrid tube 6, foam stoste entering pipeline 4 is connected with foam stoste surge chamber 5's lateral wall fixed connection, and foam stoste entering pipeline 4 is linked together with foam stoste surge chamber 5.
As shown in fig. 1, in order to make the secondary working fluid and the fire water fully and efficiently mix, the spinning jet mixing pipe 6 comprises a gradually-reducing section 61, a throat section 62 and a gradually-expanding section 63 which are mutually integrated or fixedly connected and mutually communicated, the throat section 62 is provided with swirl holes 64 which are radially and uniformly arranged along the throat section 62, the foam stock solution buffer chamber 5 is communicated with the inner cavity of the spinning jet mixing pipe 6 through the swirl holes 64, the inner wall of the throat section 62 is provided with a first diversion trench 65 in a thread shape, and the inner wall of the swirl holes 64 is provided with a second diversion trench 66 in a thread shape.
The self-spinning jet mixing pipe 6 is formed by turning and directly machining a rotating hole on a bar, the outer diameter of the self-spinning jet mixing pipe is consistent with that of the main waterway pipeline 2 and the foam stock solution inlet pipeline 4, and the pipe diameter of the self-spinning jet mixing pipe 6 can be selected according to the pipe diameters of standard series and the flow required by a CAFS system.
As shown in fig. 2, in order to form the swirling jet of the secondary working fluid and form swirling mixing with the fire water, an included angle α between a center line of the swirling hole 64 of the throat section 62 and a normal line at the inner pipe wall of the throat section 62 is controlled within a range of 15 ° to 60 °.
Further, the outer diameter of the spinning jet mixing pipe 6 is DN 50-DN 250, and the length proportion relation of the tapered section 61, the throat section 62 and the divergent section 63 is L1:L2:L3＝1:1～2:2～3。
Further, the pitch of the first guide groove 65 on the inner wall of the throat section 62
Wherein L is2The pitch of the second channels 66 on the inner wall of the swirl holes 64 is the length of the throat section
Wherein L is4Is the length of the swirl hole. The spiral first guide groove 65 of the throat section 62 and the spiral hole 64 have the same direction of spiral flow, and are both anticlockwise or both clockwise.
Further, the inner diameter D of the swirl hole 641With the inner diameter D of the foam concentrate inlet pipe 42The relationship between them is: n x D1≈D2Wherein n is the number of the swirl holes 64, and n is more than or equal to 2 and less than or equal to 6.
Further, the inner diameter D of the throat section 623Inner diameter D of swirl hole 641The relationship between them is:
wherein n is the number of the swirl holes 64, and n is more than or equal to 2 and less than or equal to 6.
As shown in fig. 1, for the convenience of connecting with an external fire water connection part, the outer end of the main waterway pipeline 2 is provided with a waterway inlet flange 1.
As shown in fig. 1, for the convenience of connecting with an external foam stock solution connecting component, a foam stock solution inlet flange 3 is arranged at the outer end of the foam stock solution inlet pipeline 4. The foam stock solution inlet flange 3 and the middle section of the foam stock solution inlet pipeline 4 are offset from the middle section of the swirl hole 64 and should be far away from the swirl hole as far as possible so as to ensure that the flow distribution of each swirl hole is uniform.
As shown in fig. 1, for the convenience of connecting with the subsequent components of the CAFS system, the outer end of the mixed liquid outlet pipe 7 is provided with a mixed liquid outlet flange 8.
The working process of the utility model is as follows: fire water enters at a certain speed through a waterway inlet flange, enters a tapered section 61 of a self-spinning jet mixing pipe 6 through a flow waterway main pipeline 1, then enters a throat pipe section 62 to be depressurized and accelerated to form a negative pressure region, and forms rotational flow under the action of a threaded first guide groove 65, foam stock solution enters a foam stock solution buffer chamber 5 through a foam stock solution inlet flange 3 through a foam stock solution inlet pipeline 4, then is sucked into the self-spinning jet mixing pipe 6 through a rotational flow hole 64 under the action of negative pressure, the foam stock solution forms rotational flow three-dimensional flow under the action of an inner second guide groove 66 and a rotational flow inflow angle after passing through the rotational flow hole 64, and two fluids are rapidly, efficiently and uniformly mixed in a pipe of the self-spinning jet mixing pipe 6 and then flow to the rear end through a mixed liquid output pipe 7 and a mixed liquid outlet flange 8.
The specific embodiment 1 provided by the utility model is as follows:
the self-rotating foam proportioner for the CAFS in example 1 has a structure that a water path inlet flange 1 and a mixed liquid outlet flange 8 are DN150 standard flanged ring plate type loose tube steel flanges, a water path main pipe 2 and a mixed liquid outlet pipe 7 are DN150 standard stainless steel welded steel tubes with an outer diameter of 168.3mm and a wall thickness of 4mm, a foam stock solution inlet flange 3 is DN32 standard flanged ring plate type loose tube steel flange, a foam stock solution inlet pipe 4 is DN32 standard stainless steel welded steel tube with an outer diameter of 42.4mm and a wall thickness of 2mm, a self-rotating jet mixing pipe 6 with an outer diameter of 168.3mm, an internal throat pipe section with a diameter of 38mm, a throat pipe with a length of 80mm, a tapered section with a length of 130mm, a tapered section with a length of 50mm, a swirl hole with a diameter of 10mm, a swirl hole pitch of 7.5mm, an included angle between the center line of the swirl hole and the normal line of the throat pipe wall is 25 degrees, 4 swirl holes are totally rotated clockwise from the outlet, and when viewed from the outlet, the thread guide groove on the inner wall of the throat pipe section rotates clockwise, and the thread pitch is 15 mm.
Fire water flows in from a main waterway pipeline 2, the flow rate is 2328L/min, the fire water flows through a throat pipe section and is depressurized and accelerated to form a negative pressure area, foam stock solution is sucked through a swirl hole, the foam stock solution is sucked through a foam stock solution buffer chamber 5, the flow rate is 72L/min, two flows of fluids are mixed in a mixing pipe in a swirl cross flow mode, the mixing effect of the foam stock solution and the fire water is quantitatively evaluated by using the volume concentration of the foam solution at different transverse cross sections at the downstream of an outlet flange of a mixer, when the volume concentration of the foam solution is 0, the two flows of fluids are not mixed, when the volume concentration of the foam solution reaches 0.03, the two flows of fluids are completely mixed, when the volume concentration of the foam solution reaches 0.0285 (95% mixing effect), the length of a required mixing bed is about 600mm, the mixing efficiency is high, and the mixing effect is good.
According to the foam proportioner provided by the utility model, the structural dimensions of the mixer, such as the length of the mixer, the diameter of the swirl hole and other specific structural parameters are calculated by a conventional process by a person skilled in the art according to the actual application requirements, and are not limited by the technical scheme disclosed in the embodiment 1.
The utility model has the advantages that:
(1) the mixer of the utility model forms a negative pressure area by reducing and increasing the pressure of fire water at the throat part, automatically sucks foam stock solution, and does not need a foam stock solution end power source, thereby simplifying the structure of a CAFS system and improving the stability of the system.
(2) The inner wall of the throat pipe and the inner wall of the rotational flow hole are both provided with the thread flow guide grooves, the central line of the rotational flow hole and the normal line of the pipe wall of the throat pipe form a certain angle, the thread flow guide grooves on the inner wall of the throat pipe section and the rotational flow direction of the rotational flow hole are consistent, and the foam stock solution forms rotational flow three-dimensional flow after flowing through the rotational flow hole, so that the turbulent flow mixing strength at the boundary layer can be effectively enhanced, the length of a mixer is favorably shortened, the fire fighting water and the foam stock solution are quickly and efficiently mixed, and the fire fighting water and the foam stock solution can be well applied to CAFS.
(3) The self-spinning jet mixing tube is formed by integrally turning and drilling, the welding difficulty is greatly reduced, the mixer is simple in structure, no moving part is arranged in the mixer, the flow resistance is small, the mixer is not easy to block, and the maintenance cost is low in the subsequent use process.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations can be made by the worker in the light of the above teachings without departing from the spirit of the utility model. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. A from rotating foam proportioner for CAFS is characterized in that: including water route trunk line (2), foam stoste entering pipeline (4), foam stoste surge chamber (5), spin jet mixing tube (6) and mixed liquid output tube (7), water route trunk line (2) are linked together with the one end of spin jet mixing tube (6), and the other end and mixed liquid output tube (7) of spin jet mixing tube (6) are linked together, foam stoste surge chamber (5) suit is in the periphery of spin jet mixing tube (6), and foam stoste surge chamber (5) are linked together with the inner chamber of spin jet mixing tube (6), foam stoste entering pipeline (4) and the lateral wall fixed connection of foam stoste surge chamber (5), and foam stoste entering pipeline (4) are linked together with foam stoste surge chamber (5).
2. A spinning foam proportioner for CAFS according to claim 1 wherein: spin jet mixing tube (6) including mutual as an organic whole or fixed connection and mutual intercommunication convergent section (61), choke section (62) and divergent section (63), be equipped with on choke section (62) along its radial and evenly arranged whirl hole (64), foam stoste surge chamber (5) are linked together through whirl hole (64) and the inner chamber of spin jet mixing tube (6), be equipped with first guiding gutter (65) that are the screw thread form on the inner wall of choke section (62), be equipped with second guiding gutter (66) that are the screw thread form on the inner wall of whirl hole (64).
3. A spinning foam proportioner for CAFS according to claim 2 wherein: and an included angle alpha between the central line of the rotational flow hole (64) of the throat pipe section (62) and the normal line of the inner pipe wall of the throat pipe section (62) is controlled within the range of 15-60 degrees.
4. A spinning foam proportioner for CAFS according to claim 2 wherein: the outer diameter of the spin jet mixing pipe (6) is DN 50-DN 250, and the length proportion relation of the convergent section (61), the throat section (62) and the divergent section (63) is L1:L2:L3＝1:(1～2):(2～3)。
5. A spinning foam proportioner for CAFS according to claim 2 wherein: the above-mentioned
Wherein L is2Is the length of the throat section of said
Wherein L is4Is the length of the swirl hole.
6. A spinning foam proportioner for CAFS according to claim 2 wherein: the inner diameter D of the swirl hole (64)1With the inner diameter D of the foam stock solution inlet pipeline (4)2The relationship between them is: n x D1≈D2Wherein n is the number of the swirl holes (64), and n is more than or equal to 2 and less than or equal to 6.
7. A spinning foam proportioner for CAFS according to claim 2 wherein: the inner diameter D of the throat section (62)3And the inner diameter D of the swirl hole (64)1The relationship between them is:
wherein n is the number of the swirl holes (64), and n is more than or equal to 2 and less than or equal to 6.
8. A spinning foam proportioner for CAFS according to claim 1 wherein: the outer side end of the waterway main pipeline (2) is provided with a waterway inlet flange (1).
9. A spinning foam proportioner for a CAFS according to claim 1, wherein: and a foam stock solution inlet flange (3) is arranged at the outer side end of the foam stock solution inlet pipeline (4).
10. A spinning foam proportioner for a CAFS according to claim 1, wherein: and a mixed liquid outlet flange (8) is arranged at the outer side end of the mixed liquid outlet pipe (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121440219.5U CN216877687U (en) | 2021-06-25 | 2021-06-25 | Self-rotating foam proportioner for CAFS (computer aided design) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121440219.5U CN216877687U (en) | 2021-06-25 | 2021-06-25 | Self-rotating foam proportioner for CAFS (computer aided design) |
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| CN216877687U true CN216877687U (en) | 2022-07-05 |
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| CN202121440219.5U Active CN216877687U (en) | 2021-06-25 | 2021-06-25 | Self-rotating foam proportioner for CAFS (computer aided design) |
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- 2021-06-25 CN CN202121440219.5U patent/CN216877687U/en active Active
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