CN114602106B - Fluid conveying pressurization impact catalytic device for foam type fire extinguishing system - Google Patents

Abstract

The invention discloses a fluid conveying pressurization impact catalytic device for a foam type fire extinguishing system. The first surface of the disk seat is concavely provided with a containing groove, the second surface is provided with an input flow channel for inputting fluid, and one end of the disk seat is provided with an output flow channel for outputting fluid. The driving disc is rotatably arranged in the containing groove, a power connecting part is arranged on the axial end face of the driving disc, a first flange is arranged on the other axial end face of the driving disc in a protruding mode, a hole wall axially extends inwards from the inner wall of the first flange, a jet flow passage is arranged on the radial end face of the driving disc, and the opening length of the jet flow passage is from the radial end face to the hole wall. The cover disc is used for being locked with the disc seat, so that the driving disc can be rotatably arranged between the cover disc and the disc seat, and the high-density fine mist foam which can greatly increase the density and the quantity of the foam can be obtained by performing pressurization impact catalysis on the foam liquid by virtue of a special fluid conveying mechanism, thereby greatly improving the efficiency of fire extinguishing and disaster relief.

Description

Fluid conveying pressurization impact catalytic device for foam type fire extinguishing system

Technical Field

The invention relates to a fluid conveying pressurization impact catalysis device for a foam type fire extinguishing system, in particular to a fluid conveying pressurization impact catalysis technology which can perform pressurization impact catalysis on foam concentrate to obtain high-density fine mist foam with greatly increased foam density and quantity.

Background

The traditional fire fighting truck extinguishes fire by bearing a large water tank; or the fire-fighting equipment with large volume is taken as the main part, and a high-pressure large water source is adopted for long-distance spraying to achieve the cooling mode, thereby achieving the purpose of rescuing and extinguishing fire; however, the fire extinguishing mode does not achieve the effect of quick fire extinguishing. Generally, the conventional device also causes a plurality of disaster sequelae during the fire extinguishing process, and causes the following disadvantages:

(1) The traditional fire fighting truck has the defects that the volume is huge, the large water tank is borne, the large equipment is slow in movement, so that the fire fighting truck cannot arrive at a fire scene quickly for rescue and fire extinguishment, and the first time for rescue and fire extinguishment can be lost when the fire fighting truck meets narrow road conditions and roadways.

(2) During big water yield entering high temperature flame is sprayed in long distance, the very first time causes flash fire in the twinkling of an eye, and produced high temperature flame must spread the scene of a fire in the twinkling of an eye, causes personnel's injury, and the disappearance of long distance spraying can't be directed against the department of a fire and spray the fire extinguishing, more causes dense smoke to diffuse in the interior space, lets the body sink into the fact that the scene of a fire personnel fleed and do not have a door.

(3) The method is characterized in that large water is sprayed into a fire scene at high pressure from a long distance, water is sprayed into the fire scene at high pressure, the water is about 1 to 3 tons per minute according to the size of a water gun, and the demand of 5 tons per minute of water for a fire-fighting water cannon causes global damage, ice disasters (such as news events causing collapse of building bodies in Harbin markets) are caused in cold regions, and news events causing large water disasters are caused in subtropical regions.

(4) For a fire fighting truck which bears a large water tank and is provided with large-volume equipment, because the water consumption is large, the water supply source is difficult, and in addition, the water taking is difficult and the operation is complex, the fire extinguishing efficiency is poor.

Known foam extinguishing agents include the following classes, as is known:

1. the first type is a foam fire extinguishing agent extracted from animal fat protein, which is used for carrying large water tanks, large equipment is provided with a large foam mixing tank, and after fire extinguishment, odor of the foam can cause operators to vomit, and further causes the problem of environmental pollution, and the foam is stopped being used in advanced countries.

2. The second type is hydrophilic foam concentrate which is generated by adopting large equipment to configure a large foam mixing tank in a high-pressure mode, and then friction foam particles are generated in a pipeline by using a high-pressure foaming component in a low-pressure, medium-pressure and high-pressure foaming mode to achieve the purpose of rescuing and extinguishing a fire, the foam concentrate is a foam and water mixed liquid by adopting the foaming mode, the required foam concentrate is mixed at the ratio of 3 to 10 percent, multiple disaster sequelae are caused in the fire extinguishing process, environmental pollution is caused, although the fire can be extinguished, the effect of quickly reducing the temperature cannot be achieved, and the principle that the temperature is reduced slowly relative to the fire extinguishing speed is good.

3. The third type of foam is prepared by mixing water and 1 to 6 percent of foam stock solution; or adopt the operating mode of the siphon type foam gun to put out the fire, the disadvantage of this kind of type is to adopt a large amount of water and foam mixed liquid, can put out the fire and already pollute the environment siphon foam to put out the fire by adopting the large-area covering mode, adopt the water pressure of large-scale apparatus supply, dispose the siphon foam spray gun at the end of putting out the fire, produce the friction foam granule, and then achieve the goal of rescuing and putting out the fire, adopt this kind of foaming mode to be foam and water mixed liquid in fact, the proportion of necessary foam stock solution is in 3-10%, cause the calamity sequelae of the multiplicity in the course of putting out the fire, cause the environment to pollute greatly, can put out the fire and can't get the result of fast cooling, it is good for the slow principle of putting out the fire to cool down slowly.

To overcome the above-mentioned drawbacks, the present inventors developed a patent as shown in "improvement of configuration structure of fire-fighting motorcycle" model M477420 in Taiwan. Although the patent can reduce the resistance of the foam concentrate during the transportation by simplifying the components and the pipeline structure and changing the injection direction of the foam concentrate, the density and the quantity of the foam in the foam concentrate are increased, thereby enhancing the fire extinguishing and disaster relief efficiency to a limited extent; however, the pump of this patent only adopts the general configuration, so only can produce disposable foam pressurization catalysis effect, so can't increase foam density and quantity by a wide margin, and the efficiency of fire fighting and disaster relief still need to be improved.

Disclosure of Invention

The invention mainly aims to provide a fluid conveying pressurization impact catalysis device applied to a foam type fire extinguishing system, and mainly aims to design a set of fluid conveying mechanism capable of performing pressurization impact catalysis on foam liquid aiming at the foam type fire extinguishing system, and then obtain high-density fine mist foam capable of greatly increasing the density and the quantity of the foam by matching with the pressurization blowing effect generated by the pressurization blowing setting of the original fire extinguishing system, so that the fire extinguishing and disaster relief efficiency is greatly improved. The technical means adopted to achieve the main purpose of the invention is arranged in a foam type fire-fighting system for conveying and pressurizing a fluid of the fire-fighting system, and the foam type fire-fighting system comprises a disc seat, a driving disc, a cover disc and other technical characteristics. The disc seat comprises a first surface and a second surface which are mutually extended in opposite directions, the first surface is concavely provided with a containing groove, the second surface is provided with an input flow channel which is communicated with the containing groove and is used for inputting fluid, and one end of the disc seat is provided with an output flow channel which is communicated with the containing groove and is used for outputting fluid. The driving disc is rotatably arranged in the containing groove, one axial end face of the driving disc is provided with a power connecting part, the other axial end face of the driving disc is convexly provided with a first flange communicated with the input flow channel, the inner wall of the first flange extends inwards in the axial direction to form a hole wall, the radial end face of the driving disc is provided with at least one injection flow channel, and the opening length of the injection flow channel is from the radial end face to the hole wall. The cover disk is locked with the disk seat, so that the drive disk can be rotatably inserted between the cover disk and the disk seat.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required for the embodiments or the technical solutions in the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic diagram of a specific configuration implementation of the foam fire extinguishing system of the present invention.

Fig. 2 is a schematic cross-sectional view of the disk seat of the present invention.

FIG. 3 is a schematic diagram of an exploded embodiment of a fluid delivery pressurized shock catalytic device of the present invention.

FIG. 4 is a schematic diagram of an integrated embodiment of a fluid delivery pressurized shock catalytic device of the present invention.

FIG. 5 is an assembled cross-sectional schematic view of a fluid delivery pressurized shock catalytic device of the present invention.

FIG. 6 is a schematic top perspective cross-sectional view of a fluid transport pressurized shock catalyst device of the present invention.

Wherein the foam fire suppression system 10; a water supply unit 11; a foam concentrate supply unit 12; a mixing tank 13; a foaming chamber 14; a gas pressurizing unit 15; a pressurizing tank 150; a spray gun 16; a first pipe 17; a second conduit 170; a third conduit 171; a fourth conduit 172; a fifth pipeline 173; a fire hose 18; a fluid delivery pressurized shock catalyst device 20; a tray base 21; a vessel 210; a first circular bore section 210a; a second circular bore section 210b; a throwing groove 210c; an input flow channel 211; an output flow passage 212; a first end 212a; a second end 212b; acicular projection 212c; a drive disc 22; a power connection 220; a first flange 221; a second flange 222; a bore wall 223; an injection flow passage 224; the arc bars 224a; the nozzle holes 224b; the suction hole 224c; a coil 225; a cone cover 226; a cover disk 23.

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 drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

Referring to fig. 1 to 6, this embodiment is an embodiment for achieving the main purpose of the present invention, and is a fluid transportation pressurization impact catalysis device 20 used as a foam fire extinguishing system 10, which is disposed on the foam fire extinguishing system 10 for transporting the fluid of the pressurization foam fire extinguishing system 10. The fluid transportation pressurization impact catalysis device 20 comprises a disk seat 21, a driving disk 22 and a cover disk 23. The tray base 21 includes a first surface and a second surface extending in opposite directions, the first surface is concavely provided with a containing groove 210, the second surface is provided with an input channel 211 communicated with the containing groove 210 and used for inputting fluid, one end of the tray base 21 is provided with an output channel 212 communicated with the containing groove 210 and used for outputting fluid. The driving disc 22 is rotatably disposed in the accommodating groove 210, a power connection portion 220 is disposed on one axial end surface of the driving disc 22, a first protruding edge 221 communicated with the input flow channel 211 is disposed on the other axial end surface of the driving disc 22 in a protruding manner, a hole wall 223 axially extends inward from an inner wall of the first protruding edge 221, at least one injection flow channel 224 is disposed on a radial end surface of the driving disc 22, and an opening length of the injection flow channel 224 is from the radial end surface to the hole wall 223. The cover plate 23 is locked with the base plate 21, so that the driving plate 22 is rotatably interposed between the cover plate 23 and the base plate 21.

Referring to the embodiment shown in fig. 6, the number of the injection channels 224 is plural, and the plural injection channels 224 are equidistantly arranged on the driving plate 22.

Referring to the embodiments shown in fig. 5 to 6, each injection channel 224 includes two juxtaposed arcs 224a extending in an arc shape, a nozzle hole 224b is formed at one end of the two arcs 224a on the radial end surface, and a suction hole 224c is formed at the end of the two arcs 224a on the end surface of the hole wall 223.

Referring to the embodiment shown in fig. 2, the input flow channel 211 includes a first circular hole section 210a disposed at the center of the accommodating groove 210 of the base 21 and a second circular hole section 210b connected to the first circular hole section 210a and having an outer diameter smaller than that of the first circular hole section 210a, and when the first protrusion 221 is accommodated and rotated in the first circular hole section 210a, the end edge of the first protrusion 221 is just abutted against the opposite end edge of the second circular hole section 210 b.

Referring to the embodiment shown in fig. 3 to 5, a second flange 222 protrudes from an axial end surface of the driving disc 22, the second flange 222 is used for driving a power connection portion 220, and the power connection portion 220 is used for driving an output shaft of a motor, so that the driving disc 22 can be driven by the motor to rotate.

Referring to the embodiment shown in fig. 5, a screw tube 225 having a screw hole is embedded in the end wall where the first flange 221 and the second flange 222 are joined, a cone cover 226 closing the screw hole is covered at the end of the screw tube 225, the tip of the cone cover 226 is located between the first flange 221 and the hole wall 223, and the screw hole of the screw tube 225 is connected with the power connection portion 220.

Referring to the embodiment shown in fig. 2, the output flow channel 212 has a first end 212a far away from the container 210 and a second end 212b connected to the container 210, the aperture of the first end 212a gradually decreases toward the second end 212b, a plurality of needle-shaped protrusions 212d are disposed on one side of the second end 212b, and the needle-shaped protrusions 212c are used for performing pressurized impact catalysis on the foam liquid passing through at high speed, so that high-density fine mist foam can be obtained through the pressurized impact catalysis.

Specifically, the annular wall of the accommodating cavity 210 is provided with a throwing channel 210c extending from one side of the second end 212b of the output flow channel 212 to the other side of the second end 212b, a front section of the throwing channel 210c extending from one side of the second end 212b is overlapped with a partial circular arc of the driving disc 22, when a rear rotary section of the throwing channel 210c is closer to the other side of the second end 212b, the rear rotary section is gradually enlarged relative to the outer periphery of the driving disc 22, and the throwing channel 210c has a groove gradually recessed and deepened from the front section to the rear rotary section.

In the specific operation embodiment, when the driving disc 22 is driven by the motor through the power connection portion 220 to rotate, the foam liquid is sucked through the input flow channel 211; then, the foam liquid enters each injection flow channel 224 sequentially through the first flange 221 and the hole wall 223, because the injection flow channel 224 extends in an arc shape, the foam liquid is sucked through the suction hole 224c of the injection flow channel 224 and sprayed from the spray hole 224b at the end to the front section of the throwing groove 210c, so as to improve the pressurization effect of the foam liquid, under the continuous rotation of the driving disc 22, the spray hole 224b of each injection flow channel 224 sequentially sprays the foam liquid to the throwing groove 210c, when the spray hole 224b of one of the injection flow channels 224 is aligned with the position of the rear rotating section of the throwing groove 210c and is close to the second end 212b, the radial end surface of the driving disc 22 pressurizes and extrudes the foam liquid to the second end 212b in a rotating manner, so as to realize the friction refining treatment (i.e. the increased squeezing and throwing action) of the foam liquid; meanwhile, when the foam liquid enters the second end 212b side, the foam liquid can impact each acicular projection 212c and then pass through at a high speed, so that the friction refining treatment (namely the pressurization impact catalysis effect) of the foam liquid is realized again; then, the above steps are repeated for the nozzle 224b of the next injection channel 224, so that the first end 212a of the output channel 212 can output the high-density fine mist foam after the pressurized impact catalysis to the spray gun 16.

Referring to the embodiment shown in fig. 1, the input flow channel 211 is connected to the outlet of the mixing tank 13 of the foam fire fighting system 10, the output flow channel 212 is connected to an inlet of the foaming chamber 14 of the foam fire fighting system 10, and the fluid is foam liquid obtained by mixing water and foam concentrate in the mixing tank.

Fig. 1 shows a schematic composition of a foam fire extinguishing system 10 according to the present invention, which comprises a water supply unit 11 (which may be implemented by external water source or water tank), a foam liquid supply unit 12 for supplying foam liquid, a mixing tank 13, a foaming chamber 14, a gas pressurizing unit 15, and a spray gun 16. One inlet of the mixing tank 13 is communicated with the water supply unit 12 through a first pipe 17, and the other inlet of the mixing tank 13 is communicated with the foam concentrate supply unit 12 through a second pipe 170 for mixing water and the foam concentrate into foam concentrate. The input channel 211 of the fluid transportation pressurization and impact catalysis device 20 is communicated with the output end of the mixing tank 13 through the third pipeline 171, the output channel 212 of the fluid transportation pressurization and impact catalysis device 20 is communicated with one inlet of the foaming chamber 14 through the fourth pipeline 172, the output end of the pressurization tank 150 of the gas pressurization unit 15 is communicated with the two inlets of the foaming chamber 14 through the fifth pipeline 173, and the outlet of the foaming chamber 14 is communicated with the spray gun 16 through the fire hose 18. The fifth pipeline 173 and the fourth pipeline 172 are parallel to and are conveyed in the same direction as the axis of the outlet of the foaming chamber 14, and the gas pressurizing unit 15 continuously pressurizes and blows the foam liquid to obtain high-density fine mist foam, so that the high-density fine mist foam can be output to the spray gun 16.

Specifically, the foam stock solution contains 25 to 30 parts by weight of butyl diglycol ethyl ether, 10 to 15 parts by weight of alkyl sulfate and 15 to 20 parts by weight of alkyl sulfonate.

In a specific embodiment, the invention uses water with a high pressure of 67 cubic meters per minute and a foam stock solution with a ratio of about 38-40 liters per minute and the ratio as fire extinguishing components. Specifically, the proportioning formula of the invention is characterized in that water of 40 liters per minute is mixed with 0.3% -1% of foam stock solution to catalyze high-density fine mist foam, the temperature of a fire scene is instantly reduced to more than 800 ℃, and various fire extinguishments can be carried out, the high-density fine mist foam touches a fire source, so that burning particles of fire disappear, and the effect of fast and effective cooling is achieved, thereby realizing the facts of water saving, energy saving, environmental protection, fast fire extinguishment, fast cooling and high-efficiency fire extinguishment. The constant control technology is used to generate foam mist with constant micron particles (because the thinner the particle size of the foam mist is, the better the fire extinguishing efficiency is), therefore, the foam mist distributed in constant space can extinguish the fire effectively and quickly.

In addition, the catalyzed high density fine mist foam has the functional effects as follows:

a. the fire extinguishing can be carried out on the comburent: 1. the four simultaneous fire extinguishing functions of inhibiting, 2 isolating, 3 cooling and 4 suffocating are realized, the chain reaction intermediate free radical can be effectively inhibited, and the goal of 'fast extinguishing' is realized.

b. Inhibition: when the molecular foam is evaporated, a high-efficiency heat dissipation barrier can be generated, and the free radicals of the chain reaction intermediates are effectively interrupted, so that the chain reaction of combustion is interrupted, and the combustion cannot be continuously carried out. The primary mechanism of fire suppression is chemical inhibition.

c. Isolation: the molecular foam can separate the combustible, the ignition source and the oxygen while evaporating, so that the combustion reaction can be automatically stopped, and in a fire disaster, the channels of combustible gas, liquid and objects flowing to an ignition area can be effectively cut off, so that the pipeline and the area where the combustible is combusted form the effect of isolating and extinguishing the fire.

d. Cooling' effect: the molecular foam is evaporated, so that high-temperature oxygen ions in the combustion are eliminated, the temperature and dense smoke are instantly disappeared, the reaction speed of oxygen tempering is inhibited, the demonstration of high-efficiency fire extinguishing function of early extinguishing, fast extinguishing and extinguishing is realized, and the molecular foam has the function of protecting the personal safety of a fire extinguisher.

e. Asphyxia effect: the molecular foam can promote the chain reaction of combustion to be interrupted while evaporating, so that the combustion cannot be continuously carried out. The molecular foam is attached to the burning object immediately, and has the functions of flame retarding and re-burning preventing.

f. The high-efficiency cooling function can effectively extinguish burning particles in the incandescent flame, promote the dense smoke to disappear instantly, and achieve the effect of efficiently extinguishing fire.

g. Blocking the transmission of radiant heat: the catalyzed high-density fine mist foam has a high-efficiency heat dissipation barrier, can effectively block the transfer effect of radiant heat, and can protect the personal safety of firefighters.

h. Inhibition of oxygen tempering effect: the catalyzed high-density fine mist foam has the effect of blocking the transmission of radiant heat when evaporating, so that the oxygen content in the air can be reduced, and the reaction speed of oxygen tempering can be inhibited, thereby having the advantage of ensuring firefighters.

In addition, according to the experimental examples, it is found that the average foam particle size of the high-density fine mist foam of the present invention is between 300 and 400um, and the water supply unit 11, the foam concentrate supply unit 12 and the gas pressurization unit 15 can respectively supply a certain amount of water, foam concentrate and high-pressure air under the transportation action of the fluid transportation pressurization impact catalysis device 20; wherein, the volume ratio of the high-pressure air, the water and the foam stock solution is about 54:35.77: 43.725:0.275. The spray gun 16 is used for spraying high-density foam in the foaming cabin 14, and the pressure between the foaming cabin 14 and the spray gun 16 can be maintained at 2.5 to 3.5/cm < 2 >; when the spray gun 16 is started to spray high-density foam, the pressure between the foaming chamber 14 and the spray gun 16 is kept at about 2.5 to 3.5kg/cm2.

After the description of the above embodiments, the present invention indeed designs a fluid delivery mechanism for performing pressurization impact catalysis on foam liquid for a foam fire extinguishing system, and then cooperates with the pressurization blowing effect generated by the pressurization blowing device of the original fire extinguishing system to obtain high-density mist foam with greatly increased foam density and quantity, thereby greatly improving the fire extinguishing and disaster relief efficiency.

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 the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (3)

1. The utility model provides a fluid transportation pressure boost impact catalysis device for foam formula fire extinguishing systems, its locates foam formula fire extinguishing systems for carry this fire extinguishing systems's of pressure boost a fluid, its characterized in that includes: a disc seat, which comprises a first surface and a second surface which are mutually extended in opposite directions, wherein the first surface is concavely provided with a containing groove, the second surface is provided with an input flow channel which is communicated with the containing groove and is used for inputting the fluid, and one end of the disc seat is provided with an output flow channel which is communicated with the containing groove and is used for outputting the fluid; a driving disk, it is set in the containing groove rotationally, one axial end of the driving disk is set with a power connecting part, another axial end of the driving disk is set with a first flange connected with the input flow channel, the inner wall of the first flange extends axially inwards with a hole wall, the radial end of the driving disk is set with at least one jet flow channel, the open length of the jet flow channel is from the radial end to the hole wall; each injection flow channel comprises two arc strips which are juxtaposed and extend in an arc shape, one end of each arc strip which is juxtaposed and extend in the arc shape forms a spray hole on the radial end surface, and the tail ends of the two arc strips which are juxtaposed and extend in the arc shape form a suction hole on the end surface of the hole wall; the annular wall of the containing groove is provided with a throwing groove which extends from one side of the second end of the output flow channel to the other side in a surrounding way, the front section of the throwing groove which extends from one side of the second end in the surrounding way is overlapped with partial circular arc of the driving disc, when the rear rotating section of the throwing groove is close to the other side of the second end, the rear rotating section is gradually enlarged relative to the periphery of the driving disc, and the throwing groove is provided with a groove which is gradually recessed and deepened from the front section to the rear rotating section; the input flow passage is communicated with the output end of a mixing tank of the foam type fire-fighting system; the output flow channel is communicated with one input end of a foaming chamber of the foam type fire-fighting system so as to convey the fluid mixed by the mixing tank to the foaming chamber; the fluid is foam liquid formed by mixing water and foam stock solution in the mixing tank; and a cover disc, it is used for locking with the base of the disc, make the driving disc insert between base of the disc and the cover disc rotatably; wherein, the output flow channel is provided with a first end far away from the containing groove and a second end connected with the containing groove, the aperture of the first end gradually reduces towards the second end, and one side of the second end is provided with a plurality of needle-shaped protrusions which are arranged in a protruding way; the axial end face of the driving disk is convexly provided with a second flange, the second flange is internally provided with a power connecting part which can be linked with the power connecting part, and the power connecting part can be linked with an output shaft of a motor, so that the driving disk can be driven by the motor to rotate; the number of the at least one injection flow channel is a plurality, and the plurality of injection flow channels are equidistantly distributed on the driving disc.

2. The fluid-delivery pressurized impact catalysis device for a foam-type fire extinguishing system as recited in claim 1, wherein the input channel comprises a first circular hole section disposed at a center of the receiving groove of the tray and a second circular hole section connected to the first circular hole section and having an outer diameter smaller than that of the first circular hole section, wherein when the first flange is rotatably received in the first circular hole section, an end edge of the first flange abuts against an opposite end edge of the second circular hole section.

3. The fluid delivery pressurized impulse catalyst for a foam fire suppression system as recited in claim 1, wherein the end wall of the first flange that engages the second flange is embedded with a threaded pipe having a threaded hole, the end of the threaded pipe is covered with a cone cap that closes the threaded hole, and the tip of the cone cap is located between the first flange and the wall of the hole.

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