Fire-retardant plug for gas pipeline and its making method
阅读说明：本技术 燃气管道阻火塞及其制造方法 (Fire-retardant plug for gas pipeline and its making method ) 是由 杨富云 于 2019-10-23 设计创作，主要内容包括：本发明公开了燃气管道阻火塞及其制造方法,其特征在于：阻火塞(1)直接塞进燃气罐上的减压阀(10)或燃气管路上的减压阀(11)与燃气设备连通的燃气软管(2)中,阻断回火；所述阻火塞(1),由一端带有波浪形条(4),另一端为平整长条(3)的金属条(17),中间垂直用两根平行半圆钢棒(5)夹住,卷绕,平整长条(3)金属条末端点焊在最外层金属条(17)上,抽去两平行半圆钢棒(5),所得带有与卷绕方向垂直的波浪形通孔(7)的螺旋结构的阻火器；所有波浪形通孔(7)断面直径都小于临界直径,所述临界直径为,当燃气管径小到某一极限值时,向管壁的散热大到火焰无法传播程度的燃气管的直径。该阻火塞(1)既能通燃气,又能绝对阻断回火,防止爆炸。(The invention discloses a fire retardant plug for a gas pipeline and a manufacturing method thereof, and is characterized in that: the fire retardant plug (1) is directly plugged into a pressure reducing valve (10) on a gas tank or a gas hose (2) with a pressure reducing valve (11) on a gas pipeline communicated with gas equipment to block tempering; the fire retardant plug (1) is formed by a metal strip (17) with a wavy strip (4) at one end and a flat strip (3) at the other end, the middle of the metal strip is vertically clamped by two parallel semicircular steel rods (5) and wound, the tail end of the metal strip of the flat strip (3) is spot-welded on the outermost metal strip (17), the two parallel semicircular steel rods (5) are pulled out, and the fire retardant device with the spiral structure and the wavy through hole (7) vertical to the winding direction is obtained; the diameters of the sections of all the wavy through holes (7) are smaller than a critical diameter, and the critical diameter is the diameter of the gas pipe when the diameter of the gas pipe is smaller than a certain limit value, and the heat dissipation to the pipe wall is larger than the flame spread-incapable degree. The fire retardant plug (1) can not only lead in fuel gas, but also absolutely block tempering, thereby preventing explosion.)
1. Gas pipeline back-fire relief plug in connecting gas jar or gas pipe relief valve (10 or 11) and gas equipment (16) between the gas hose (2) of intercommunication, can lead to gas (8), can block the spark arrester of returning flame (9) again, its characterized in that:
the gas pipeline fire retardant plug (1) is characterized in that one end of the gas pipeline fire retardant plug (1) is provided with a wave-shaped long strip (4), the other end of the gas pipeline fire retardant plug is provided with a flat long strip (3) metal strip, the middle of the gas pipeline fire retardant plug is vertically clamped by two parallel round steel rods (5), the two ends of the gas pipeline fire retardant plug are overlapped, then the gas pipeline fire retardant plug rotates anticlockwise or clockwise and is wound on two parallel semi-round steel rods (5) with the diameter smaller than the critical diameter, the tail end of the flat long strip (3) metal strip (17) is spot-welded on the outer side of the outermost flat long strip (3) metal strip (17), and finally the two parallel semi-round steel rods (5) are drawn out, so that a cylindrical fire;
the gas inlet end (12) and the gas outlet end (13) of the gas pipeline fire retardant plug (1) and the main body shell are gas hoses (2), and the outermost layer of the fire retardant plug (1) is tightly tightened by the inner walls of the gas hoses (2);
the outer diameter of the flame retardant plug (1) of the gas pipeline is equal to or larger than the inner diameter of the gas hose (2), and the wave-shaped through hole (7) of the flame retardant plug (1) is axially parallel to the tube core shaft of the gas hose (2) and is plugged into the gas hose to prevent slipping;
the diameters of the sections of all the wavy through holes (7) of the gas pipeline fire-retardant plug (1) are smaller than the critical diameter;
the critical diameter is the diameter of the gas pipe when the pipe diameter of the gas to be introduced is small to a certain limit value, and the heat dissipation to the pipe wall is large to the extent that flame cannot be spread;
when the gas hose is communicated with H2When the powder is mixed with air according to a stoichiometric ratio, the critical diameter is 0.9 mm;
when the gas hose is communicated with CH4When the powder is mixed with air according to a stoichiometric ratio, the critical diameter is 3.5 mm;
when the coke-oven gas and the air are introduced into the gas hose and mixed according to the stoichiometric ratio, the critical diameter is 2 mm.
2. A gas pipe flame arrester plug (1) as claimed in claim 1, which is at least 3mm in length.
3. A gas pipe flame arrester plug (1) as claimed in claim 1, which is manufactured from a metal strip having a thickness of between 0.2mm and 2mm, including 0.2mm and 2 mm.
4. The gas pipeline flame retardant plug (1) as claimed in claim 1, wherein the metal strip (17) is made of a metal with good thermal conductivity and is not easy to oxidize in combustion.
5. The gas pipe flame arrester plug (1) as claimed in claim 4, the metal being stainless steel; or of iron; or copper; or aluminum.
6. A method of manufacturing a gas pipe flame arrester plug (1) as claimed in claim 1, characterized in that:
after a metal strip (17) which is at least 3mm wide and 0.2mm to 2mm thick and comprises 0.2mm and 2mm is wound, the outer diameter of the obtained fire retardant plug (1) is larger than the inner diameter of the gas hose (2), one end of the fire retardant plug is arranged between two wavy teeth and is respectively staggered in a convex-concave way by the wavy teeth of a pair of gears, the metal strip is arranged in the middle, the gears are rotationally meshed, the metal strip between the wavy teeth is extruded, a wavy strip (4) is extruded, and the wave length of the wavy strip is controlled by a stepping motor; the method comprises the steps of clamping two parallel semicircular steel bars (5) which are parallel and aligned at the same height and have the width of 3mm and the length of which is greater than that of a metal bar (17) at the middle of deformation of one end of the metal bar (17) which is changed from a flat end into a wave-shaped end, winding the clamped metal bar (17) anticlockwise or clockwise into two layers of parallel semicircular steel bars (5) at intervals, arranging a rolling roller (19) which is parallel to the axis of the parallel semicircular steel bars (5) on the outer side of the flat strip (3), elastically rolling and pressing the wound two layers of overlapped metal bars (17), rotating the two parallel semicircular steel bars (5), enabling a welding spot (15) of spot welding at the tail end of the flat strip-shaped metal bar (17) to be on the outer side of the outermost flat strip-shaped metal bar (3) after winding, enabling the flat strip-shaped metal bar (3) to be the outermost layer, enabling the inner layer of the flat strip (3) and the extruded strip (4) to be spiral winding layers at intervals, forming it into a cylindrical fire stopper (1) of overall helical configuration with a matrix (14) of at least 2 wave-shaped through-holes (17) perpendicular to the winding direction, and finally releasing the rolling roll (19) and withdrawing the parallel round steel rods (5) from one end;
the tooth diameter of the extruded wavy gear teeth (20) is less than the critical diameter.
7. Method for manufacturing a gas pipe flame arrester plug (1) according to claim 6, characterized in that: when the gas hose is communicated with H2And air in a stoichiometric ratio, the critical diameter is 0.9 mm.
8. Method for manufacturing a gas pipe flame arrester plug (1) according to claim 6, characterized in that: when the gas hose is communicated with CH4And air at stoichiometric ratio, the critical diameter is 3.5 mm.
9. Method for manufacturing a gas pipe flame arrester plug (1) according to claim 6, characterized in that: when the coke-oven gas and the air are introduced into the gas hose and mixed according to the stoichiometric ratio, the critical diameter is 2 mm.
Technical Field
The present invention relates to a flame arrester for a gas pipeline and a method for manufacturing the same, and more particularly, to a flame arrester plug for a gas pipeline, which allows gas to pass therethrough but does not allow passage of flame or explosion waves therethrough, and a method for manufacturing the same.
Background
In recent years, people use gas devices, and the explosion accidents caused by the backfire of gas tanks or gas delivery pipes are continuous to cause personal casualties or property loss, so various flame arrestors technical schemes appear, such as: the patent application No. 201810244461.1 of a spiral plate type heat pipe flame arrester comprises a flame-arresting shell and a heat pipe, wherein the flame-arresting shell is cylindrical, a base is arranged at the bottom of the flame-arresting shell, and a cover body is arranged at the top of the flame-arresting shell; be provided with the spiral board in the back-fire relief casing, the spiral board is convoluteed after first metal and second metal sheet welded connection and is constituteed, and the position of first metal sheet and second metal sheet welded connection forms the metal body, the position that first metal sheet convoluted uses the metal box body to coil to the periphery as the center, and the position that the second metal sheet convoluted uses the metal body to encircle in the outside of first metal sheet as the center, form first spiral runner and second spiral runner between the position that first metal sheet convoluted and the position that the second metal sheet convoluted. A spiral plate is arranged in the fire retardant shell to form a spiral flow channel.
For another example, in patent number ZL201220392999.5 of "gas pipeline explosion-proof flame arrester", a gas pipeline explosion-proof flame arrester is disclosed, which has a pipeline main body, and is characterized in that: offer one on pipeline main part lateral wall and be used for connecting the gas supply interface of gas supply pipeline, be equipped with the one deck safety net on the gas supply interface, and this safety net is made by the good plastics of thermoplasticity type, and its network structure for having circular through-hole, and be equipped with the end cover in order to seal the spark arrester at pipeline main part opposite side, the back-fire relief core is made by the ripple steel band, and is equipped with the through-hole that the cross section is triangle-shaped on the back-fire relief core.
In the technical schemes of the two patents, the two patents are both provided with the shell, the structure is complex, and the cost and the manufacturing cost are high; although the flame arrester can dredge fuel gas through the through hole, the length of the through hole of the flame arrester in the aspect of fire arresting, the size of the section diameter or the area of the through hole as main technical parameters, the material and the thickness of the partition board are not clearly limited and disclosed, when the length of the through hole is fixed, as long as the diameter or the area of the through hole of the largest flame arresting core reaches a certain value, flame can penetrate through the through hole of the flame arrester to cause backfire explosion, so the technical schemes disclosed by the two patents are incomplete and insufficient, and products manufactured by technical personnel in the technical field according to the technical schemes disclosed above are probably not capable of achieving the purpose of obstructing 100% of backfire due to overlarge cross section area of the through hole and expected effects.
Disclosure of Invention
The invention aims to solve the technical problem that the defects of the prior art are overcome, and the flame retardant plug and the manufacturing method thereof for the gas hose are provided, wherein the cost and the manufacturing cost are lower, the technical effect can be 100 percent of that of the prior art, and the flame retardant plug is used for blocking backfire explosion flame.
In order to achieve the purpose, the invention further improves and limits the structure, the shell, the section of the through hole and the radius of the section of a flame arrester which can not only lead gas but also block backfire in a gas hose which is communicated between a gas tank or a gas pipe safety valve and gas equipment:
the method is characterized in that:
the fire retardant plug for the gas pipeline is characterized in that one end of the fire retardant plug is provided with an extruded wavy strip, the other end of the fire retardant plug is provided with a flat long-strip metal strip, the middle of the fire retardant plug is vertically clamped by two parallel semicircular steel bars, the two ends of the fire retardant plug are overlapped and then rotate anticlockwise or clockwise, the fire retardant plug is wound on the two parallel semicircular steel bars with the diameter smaller than the critical diameter, the tail end points of the flat long-strip metal strip are welded on the outer side of the outermost flat long-strip metal strip, and finally the two parallel semicircular steel bars are drawn out, so that the fire retardant device with the spiral-structure cylinder with at least two wavy through holes;
the fire retardant plug for the gas pipeline is not provided with a shell of which a fire retardant device comprises an air inlet, an air outlet and a main body, but directly takes a gas hose as an air inlet end, an air outlet end and the shell of the main body of the fire retardant device;
the outer diameter of the fire retardant plug of the gas pipeline is equal to or larger than the inner diameter of the gas hose, and the wave-shaped through hole of the fire retardant plug is axially parallel to the tube core shaft of the gas hose, so that the fire retardant plug is plugged into the gas hose without slipping.
The diameters of the sections of all wavy through holes of the gas pipeline fire retardant plug are smaller than the critical diameter;
the critical diameter is the diameter of the gas pipe when the diameter of the gas pipe is small to a certain limit value, and the heat dissipation to the pipe wall is large to the extent that flame cannot spread.
When the gas hose is communicated with H2When the powder is mixed with air according to a stoichiometric ratio, the critical diameter is 0.9 mm; when the gas hose is communicated with CH4When the powder is mixed with air according to a stoichiometric ratio, the critical diameter is 3.5 mm; when the gas hose is communicated with the coking gas and the airWhen gas is mixed according to the stoichiometric ratio, the critical diameter of the gas is 2mm, so as to prevent backfire explosion.
The length of the fire retardant plug used in the gas hose is at least 3mm, so that the fire retardant plug can be conveniently plugged into the gas hose;
the metal strip used for manufacturing the fire retardant plug in the gas hose is metal which is not easy to oxidize in combustion and has good heat conductivity.
The gas hose is made of elastic flame-retardant materials.
The manufacturing method of the fire retardant plug used in the gas pipeline comprises the following steps:
firstly, a metal strip with the width of more than 3mm and the thickness of 0.2mm to 2mm, including 0.2mm and 2mm, and enough length is used to meet the requirement that the outer diameter of the coiled fire retardant plug is larger than the inner diameter of a gas hose, one end of the fire retardant plug is respectively concave-convex staggered by a pair of wavy teeth of gears, the metal strip is arranged in the middle of the fire retardant plug, the metal strip between the wavy gears is extruded by a rotary meshing gear, a wavy strip is extruded, the ripple length of the wavy strip is controlled by a stepping motor, and the diameter of the wavy teeth of the gears is smaller than the critical;
two parallel semicircular steel rods which are aligned at the same height and have the diameter smaller than the critical diameter and the length larger than the width of the metal strip by 3mm are respectively clamped in the middle of the deformation of one end of the metal strip changed from a flat strip into a wave-shaped end, then the clamped metal strip is wound in the anticlockwise or clockwise direction, and the metal strip is pressed by a rolling roller to move, so that the metal strip is divided into at least two layers which are alternately wound on the two aligned parallel semicircular steel rods;
and thirdly, the flattening strip metal strip is welded at the tail end of the outer side of the outermost flattening strip metal strip in a spot mode, the flattening strip metal strip is the outermost layer, the inner layer is a spiral winding layer formed by flattening layers and wave layers, the matrix with 2 wave-shaped through holes at least vertical to the winding direction is formed, the whole fire retardant plug is of a spiral structure and cylindrical, at last, a rolling roller is loosened, two parallel semicircular steel rods are drawn out from one end, and the manufacturing is finished.
The method of use of the firestop plug is as follows. The diameter of the outermost layer of the fire retardant plug is equal to or larger than the inner diameter of the gas hose, so that the fire retardant plug cannot slide in the gas hose after entering the inner wall of the gas hose, the outermost layer of the fire retardant plug is tightly attached to and expands the diameter of the gas hose, the wavy matrix through holes of the fire retardant plug are communicated with the gas inlet end and the gas outlet end of the gas hose, the section diameters of the wavy through holes of all the fire retardant plugs are smaller than the critical diameter, the critical diameter of the specifically used gas is smaller than the critical diameter, and the metal strips are made of the materials as described above.
A back-fire relief stopper theory of operation for in gas hose: by utilizing the metal net column structure with the aperture smaller than the critical diameter, the metal net column wall absorbs the heat of outward explosion tempering of the fire retardant plug, so that the tempering flame is cooled and extinguished, and the passing of the tempering flame is prevented, thereby ensuring that the fire retardant plug is ignited without flame towards a gas tank or a gas pipeline on one side of a gas source, cutting off the propagation of the flame, and finally achieving the purpose of explosion prevention.
The invention has the beneficial effects that: compared with the prior art, as the fire retardant plug is directly plugged into the gas hose, the shell of the fire retardant device is omitted, so that the structure of the fire retardant device is simpler, and the cost and the manufacturing cost are lower; because the critical diameter data verified by tests are used, the diameter and the section area of the ventilation channel of the fire retardant plug are limited, and the safety guarantee of absolute backfire explosion prevention is provided when various fuel gases are dredged.
Drawings
FIG. 1 is a schematic structural view of a flame retardant plug for a gas pipeline according to the present invention.
FIG. 2 is a side view of a first step extrusion of a metal strip for making the firestop plug of FIG. 1.
FIG. 3 is a schematic view of a second step of winding a metal strip to form the firestop plug of FIG. 1.
FIG. 4 is a cross-sectional view of a third step of spot welding for making the firestop plug of FIG. 1 and a cross-sectional view of a gas conduit.
In the figure:
1. a flame retardant plug; 2. A gas hose;
3. flattening the long strip; 4. An extruded wave-shaped strip;
5. parallel semi-round steel rods; 6. Semicircular steel bar holes;
7. a wave-shaped through hole; 8. Gas burning;
9. tempering the flame; 10. A pressure reducing valve on the gas tank;
11. a pressure reducing valve on the gas pipeline; 12. An air inlet end;
13. an air outlet end; 14. A wave-shaped through hole matrix;
15. welding spots; 16. A gas-fired device;
17. a metal strip; 18. A source of combustion gas;
19. a roll to roll.
Detailed Description
In fig. 1, one end of a gas hose 2 is heated to soften and expand, then a wavy through hole 7 of a fire retardant plug is parallel to a tube core shaft of the gas hose 2, the fire retardant plug 1 is plugged from an air inlet end 12 or an air outlet end 13 of one end of the gas hose 2, so that the outermost layer of the fire retardant plug is tightly tightened by the inner wall of the gas hose 2, and the fire retardant plug 1 cannot slide in the gas hose 2, a gas source 18 is communicated with a pressure reducing valve 10 of a gas tank or a pressure reducing valve 11 on the gas pipeline, and the air inlet end 12 of the gas hose 2 is communicated with the pressure reducing valve 10 on the gas tank or the pressure reducing valve 11 on the gas pipeline; the air outlet end 13 of the gas hose 2 is communicated with a gas device 16, the fire retardant plug 1 is arranged between the air inlet end 12 and the air outlet end 13 in the gas hose 2, when a backfire exists between the fire retardant plug 1 and the air outlet end 13, because the diameter of each wavy through hole 7 in the semicircular through hole matrix 14 in the fire retardant plug 1 is smaller than the critical diameter, when the backfire flame transmitted from the air outlet end 13 passes through the inner wall of the wavy through hole 7 of the fire retardant plug 1, because the metal mesh columns on the inner wall of the wavy through hole 7 consisting of the flat strip 3 and the extruded wavy strip 4 absorb a large amount of heat of the backfire 9, the backfire 9 dissipates the heat to the extent that the flame cannot pass through the wavy through hole 7 and then transmits the flame to the gas source 18, so that the backfire flame 9 is extinguished in the wavy through hole 7, the diameter of the wavy through hole is called the critical diameter, and the 34 th standard book number ISBN978-7-111-27542-8 in gas burning and combustion device Page 6 last row, as described, passing H through gas hose 22When the powder is mixed with air according to the stoichiometric ratio, the critical diameter is 0.9 mm; by the steps ofCH4When the powder is mixed with air according to the stoichiometric ratio, the critical diameter is 3.5 mm; when the coke-oven gas and air are mixed according to the stoichiometric ratio, the critical diameter is 2 mm. By utilizing the metal net column with the aperture smaller than the critical diameter, namely the
In the figure 2, a metal strip with the width of at least 3mm and the thickness of 0.2-2 mm is used, the length of the coiled
In fig. 3 and 4, a pair of parallel semicircular steel bars 5 aligned at the same height, the diameter of which is smaller than the critical diameter and the length of which is greater than the width of the metal strip 17 and is at least 3mm, are respectively clamped at two sides between the metal flat strip 3 and the wave-shaped strip 4 formed by extrusion, then the clamped metal strip 17 is wound anticlockwise or clockwise, so that the metal strip 17 is divided into two layers and wound on the two aligned parallel semicircular steel bars 5 at intervals, a rolling roller 19 parallel to the axis of the parallel semicircular steel bars 5 is arranged at the outer side of the flat strip 3 and is used for elastically rolling and pressing the outer side of the two layers of the wound overlapped metal strips 17, a stepping motor is electrified to drive a gear box, the gear box drives a wheel fixed with two rows of the semicircular steel bars 5, the two parallel semicircular steel bars 5 are rotated, after winding, the welding spot at the welding spot 15 at the tail end of the metal strip 17 of the flat strip 3 is spot-welded at the outer side of the, make the metal strip 17 of leveling rectangular 3 be outermost, the inlayer is the rectangular 4 intercropping spiral coil layers of wave of leveling rectangular 3 and extrusion, it has 7 helical structure matrixes 14 with winding direction vertically wave through-hole to make it form, wholly be columniform back-fire relief stopper 1, loosen rolling roller 19 at last, take out a pair of parallel semicircle steel stick 5 from one end, the diameter ratio critical diameter of parallel semicircle steel stick 5 is little, can be scribbled with lubricating oil agent on the parallel semicircle steel stick 5, or one end is thick, one end is thin, so that two holes are taken out from thin one end in the middle of back-fire relief stopper 1.
The invention relates to a gas pipeline fire retardant plug and a manufacturing method thereof, which comprise the application in gas heating, gas welding and gas cutting equipment and the like.
The gas hose of the present invention is preferably made of an elastic flame-retardant rubber.
The gas pipeline fire-retardant plug saves a shell, the elastic flame-retardant rubber connecting pipe is used as the shell, so that the cost and the manufacturing cost are greatly reduced, convenience is brought to installation and use, the critical diameter of the wavy through hole of the fire-retardant plug is limited according to the existing actual test data, and 100 percent of the fire-retardant plug plays the roles of blocking gas tempering and avoiding tempering explosion.
The above description is only exemplary of the invention and should not be taken as limiting the scope of the invention, which is defined by the appended claims.
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