阅读说明：本技术 一种燃气灶的安全装置 (Safety device of gas stove ) 是由 杨富云 于 2021-07-18 设计创作，主要内容包括：本发明公开了一种燃气灶的安全装置,包括燃气灶(17)的进气管(2)和阻火芯(3),其特征在于：所述进气管(2)的一端内设有紧密同轴固定的阻火芯(3)；所述阻火芯(3)的外径正好能套入进气管(2)的内壁(18)中,所述阻火芯(3)为圆柱形的,且表面至少带有一左螺旋槽、或右螺旋槽(4)、或同时带有左、右螺旋槽的网纹滚花槽阻火芯(16),当燃气(7)顺利通过所述螺旋槽或直槽(4)与内壁(18)之间组成螺旋槽通道或直槽通道(15),向灶头供气,与供气反向的灶头回火火焰(8)缩回螺旋槽或直槽通道(15)时,各通道的金属内壁(18)吸热,降温,熄灭,杜绝了回火爆炸,使供气更安全,结构更简单,成本更低,更易批量生产。(The invention discloses a safety device of a gas stove, which comprises an air inlet pipe (2) and a fire retardant core (3) of the gas stove (17), and is characterized in that: a fire retardant core (3) which is tightly and coaxially fixed is arranged in one end of the air inlet pipe (2); the outer diameter of the fire retardant core (3) can be just in time sleeved in the inner wall (18) of the air inlet pipe (2), the fire retardant core (3) is cylindrical, the surface of the fire retardant core is at least provided with a left spiral groove or a right spiral groove (4) or is simultaneously provided with a reticulate knurled groove fire retardant core (16) of the left and right spiral grooves, when gas (7) smoothly passes through the spiral groove or the straight groove (4) and the inner wall (18) to form a spiral groove channel or a straight groove channel (15), gas is supplied to a stove, and when the stove tempering flame (8) reversed in gas supply retracts into the spiral groove or the straight groove channel (15), the metal inner wall (18) of each channel absorbs heat, cools, extinguishes, stops tempering explosion, enables the gas supply to be safer, and has a simpler structure, lower cost and is easier to perform batch production.)

1. A safety device of a gas stove comprises an air inlet pipe (2) and a fire retardant core (3) of the gas stove (17) or other gas devices (14), and is characterized in that:

a fire retardant core (3) which is tightly and coaxially fixed is arranged in one end of the air inlet pipe (2);

the outer diameter of the fire retardant core (3) can be just sleeved into the inner wall (18) of the air inlet pipe (2);

the fire retardant core (3) is cylindrical, and at least one left spiral groove (4) is formed in the cylindrical surface; or at least with a right helical groove (4); or a reticulate pattern knurling groove (19) which is provided with a left spiral groove (4) and a right spiral groove (4) at the same time; or at least with a straight groove (4);

a spiral groove or straight groove channel (15) is formed between the inner wall (18) of the air inlet pipe (2) and the spiral groove or straight groove (4);

the maximum diameter of the section of the spiral groove or straight groove channel (15) is a critical diameter;

the critical diameter is: when the maximum diameter of the section of the spiral groove or the straight groove channel (15) of the gas to be introduced is smaller than a certain limit value, the heat radiation of the exploded tempering flame (8) to the inner wall (18) of the spiral groove or the straight groove channel (15) is larger than the diameter of the gas channel through which the flame can not spread;

when the spiral groove or the straight groove channel (15) is communicated with H₂When the powder is mixed with air according to a stoichiometric ratio, the critical diameter is 0.9 mm;

when the spiral groove or the straight groove channel (15) is communicated with CH₄When the powder is mixed with air according to a stoichiometric ratio, the critical diameter is 3.5 mm;

when coke gas and air are mixed according to a stoichiometric ratio in the spiral groove or the straight-through channel (15), the critical diameter is 2 mm.

2. The safety device of a gas range as set forth in claim 1, wherein: the length of the fire retardant core (3) is at least 3 mm.

3. The safety device of a gas range as set forth in claim 1, wherein: the air inlet pipe (2) covers the whole length of the fire retardant core (3).

4. The safety device of a gas range as set forth in claim 1, wherein: the air inlet pipe (2) and the fire retardant core (3) are both made of metal which is not easy to oxidize in combustion and has good heat conductivity.

5. The safety device of a gas range as set forth in claim 1, wherein: at least one welding point (5) of the air inlet pipe (2) and the fire retardant core (3) is arranged.

6. The safety device of a gas range as set forth in claim 1, wherein: at least one extrusion fixing point (20) of the air inlet pipe (2) and the fire retardant core (3) is provided.

Technical Field

The invention relates to a safety device of a gas stove, which comprises a gas stove or an air inlet pipe and a fire retardant core of a gas device, in particular to the fire retardant core arranged in the air inlet pipe of the gas stove.

Background

The root cause of the gas backfire explosion accident is as follows: the fire source of the gas stove can smoothly retract into the gas hose with oxygen when igniting, extinguishing or shutting off the fire, and the fire source can not stop the fire through the pressure reducing valve because the rubber film layer is damaged until the combustible gas in the gas storage tank or the gas pipeline is ignited to cause backfire explosion.

By analysis, we tested that the most effective method for preventing backfire explosion was found to be: from the source, the flame of the gas device is obstructed from propagating to the gas hose and upstream.

Therefore, the patent publication No. CN212360911U of the utility model of China discloses an implanted explosion-proof device for an air inlet pipe of an integrated cooker or a gas stove, which comprises an air inlet pipe arranged in the integrated cooker or the gas stove, a valve seat is arranged at the air inlet end of the air inlet pipe, an air outlet hole is arranged at one end of the valve seat, the end with the air outlet hole is arranged in the air inlet pipe, the side wall of the valve seat is also provided with a pressure relief hole, a needle supporting frame is arranged in the valve seat, a firing pin is arranged on the needle supporting frame, a plug is connected at one end of the firing pin, the firing pin can drive the plug to move, so that the plug is contacted with the air hole and seals the air outlet hole, the needle supporting frame is also provided with a spring, the firing pin is provided with a pressure spring plate and penetrates through the spring, and the spring is contacted with the pressure spring plate, the valve seat is also provided with a compression nut, and the valve seat is tightly connected with the air inlet pipe through the compression nut. The built-in explosion-proof device of the gas inlet pipe of the integrated cooker or the gas stove has the inevitable defects of high cost, unreliable action, high failure rate, large maintenance amount, difficult batch production and the like due to complex structure and more movable spare and accessory parts.

Disclosure of Invention

The purpose of the invention is: the safety device for gas range and other gas burning apparatus has the advantages of simple structure, no movable parts, low cost, reliable operation, no fault, no maintenance, easy mass production and capacity of preventing backfire explosion.

The invention is realized by the following steps: the utility model provides a safety device of gas-cooker or other gas devices, includes gas device's intake pipe and back-fire relief core, its characterized in that:

one end of the air inlet pipe is provided with a fire retardant core which is tightly and coaxially fixed;

the outer diameter of the fire retardant core can be just sleeved into the inner wall of the air inlet pipe;

the fire retardant core is cylindrical, and the surface of the cylindrical fire retardant core is provided with at least one left spiral groove; or at least a right spiral groove; or a reticulate pattern knurling groove which is provided with a left spiral groove and a right spiral groove at the same time; or at least with a straight groove;

a spiral groove channel or a straight groove channel is formed between the inner wall of the air inlet pipe and the spiral groove or the straight groove;

the maximum diameter of the section of the spiral groove or the straight groove channel is the critical diameter;

the critical diameter is: when the maximum diameter of the section of the spiral groove or straight groove channel of the gas to be introduced is smaller than a certain limit value, the heat dissipation of the explosion flame to the spiral channel or the inner wall of the straight channel is larger than the diameter of the gas channel through which the flame cannot spread;

when H2 and air are mixed in stoichiometric ratio in the spiral channel or straight channel, the critical diameter is 0.9 mm;

when CH4 and air are mixed in stoichiometric ratio in the spiral channel or straight channel, the critical diameter is 3.5 mm;

when the coking coal gas and the air are mixed according to the stoichiometric ratio in the spiral channel or the straight channel, the critical diameter is 2 mm;

the length of the fire retardant core is at least 3 mm;

the air inlet pipe covers the whole length of the fire retardant core;

the air inlet pipe and the fire retardant core are both made of metal which is not easy to oxidize in combustion and has good heat conductivity;

the air inlet pipe is provided with a straight pipe of a pagoda joint or is provided with a universal joint of the pagoda joint, and the inner diameter length of the inside of the pagoda joint of the air inlet pipe can be at least tightly sleeved in the length of the whole fire retardant core.

The working principle of the safety device of the gas stove is as follows: the flame retardant core is sleeved into an air inlet pipe of a gas stove and is extruded and fixed, or the contact part of the flame retardant core and the air inlet pipe which are aligned is welded together. When the back fire flame of the gas stove head passes through the left and right spiral channels or the straight channel between the fire retardant core and the gas inlet pipe, the heat of the flame is absorbed, cooled and extinguished by the metal wall of each channel, thereby preventing the combustible gas at the upstream of the fire retardant core from being ignited and avoiding the back fire explosion.

The flame arrester installed in the existing gas supply main pipeline can only protect the main pipeline of gas, but cannot enable the gas hose at each branch terminal to stop backfire, and only when all the gas pipeline branches stop backfire explosion, the whole gas supply network can be ignited without flame, so that absolute safety can be realized.

The invention has the beneficial effects that: compared with the prior art, owing to directly fill in the back-fire relief core at the intake pipe mouth end of gas-cooker, the air inlet and the gas outlet of spark arrester have been saved, and regard as the shell of spark arrester with the intake pipe, make the spark arrester and gas-cooker organic integration as an organic whole, save the shell of spark arrester again, and form the safety device of a gas-cooker, make its structure simpler, the cost is lower, it changes batch production, the most important is that the device prevents the backfire explosion from the source, no movable spare and accessory parts, work trouble-free, so reliable operation, exempt from the maintenance, factor of safety is higher.

Drawings

Fig. 1 is a schematic structural view of a safety device of a gas stove according to the present invention.

Fig. 2 is a cross-sectional view taken along line a-a of fig. 1.

Fig. 3 is a second schematic structural diagram of a safety device of a gas stove according to the present invention.

Fig. 4 is a cross-sectional view taken along line B-B of fig. 3.

Fig. 5 is a third schematic structural view of a safety device of a gas stove according to the present invention.

Fig. 6 is a cross-sectional view taken along line C-C in fig. 5.

Fig. 7 is a fourth schematic structural view of a safety device of a gas stove according to the present invention.

FIG. 8 is an oblique view of a fire stop core of the present invention with left and right spiral cross-grooves, i.e., a fire stop core with textured knurl grooves.

FIG. 9 is a cross-sectional view of a spiral groove or a straight groove with a circular arc-shaped bottom of the fire retardant core of the present invention.

FIG. 10 is a cross-sectional view of a semi-elliptical bottom spiral trough or straight trough of a firestop core of the present invention.

FIG. 11 is a cross-sectional view of a triangular bottom spiral trough or straight trough of a firestop core of the present invention.

FIG. 12 is a cross-sectional view of a circular arc-shaped spiral groove or straight groove of the firestop core of the present invention.

In the figure:

1. safety devices or flame arresters for gas cookers; 2. An air inlet pipe;

3. a fire retardant core; 4. A spiral or straight groove;

5. the welding point of the air inlet pipe and the fire retardant core; 6. A gas hose;

7. gas burning; 8. Tempering the flame;

9. a pressure reducing valve on the gas tank; 10. A pressure reducing valve on the gas pipeline;

11. an air inlet end; 12. An air outlet end;

13. a source of combustion gas; 14. A gas-fired device;

15. a helical or straight channel; 16. A fire retardant core with a reticulate pattern knurled groove;

17. a gas range; 18. An inner wall;

19. a reticulate pattern knurling groove; 20. The extrusion fixing point of the air inlet pipe and the fire retardant core;

21. a universal joint; 22. A seal ring;

23. a fastening nut of the universal joint; 24. A pagoda segment elbow of the universal joint;

25. and (4) threading.

Detailed Description

In fig. 1-2, the safety device 1 of a gas-cooker, including the gas-cooker 17 or other gas devices 14 the inlet end be for being used for with the outer screw thread 25 of gas hose 6 connection, intake pipe 2, back-fire relief core 3, characterized in that: the fire retardant core 3 is coaxially and tightly plugged into one end of the air inlet pipe 2, or at least one extrusion fixed point is arranged, the air inlet pipe 2 and the extrusion fixed point 20 of the fire retardant core 3 cannot move radially, the fire retardant core 3 at the end is axially aligned with one end of the air inlet pipe 2, at least one welding point 5 of the air inlet pipe 2 and the fire retardant core 3 which are firmly welded is arranged at the aligned end by metal, and the fire retardant core 3 and the air inlet pipe 2 are fixed into a whole and cannot move axially; the diameter of the fire retardant core 3 is such that it just fits into the inner diameter of the air inlet pipe 2, the length of the fire retardant core 3 is at least 3mm, preferably the length of the fire retardant core 3 is 25mm, and more than 25mm, and the air inlet pipe 2 covers the entire length of the fire retardant core 3. The safety device 1 of the gas stove on the gas stove 17, which is formed by spot welding the fire retardant core 3 and the end of the gas inlet pipe 2, is regulated according to the national oil gas pipeline flame arrester GB/T13347-2010: under standard test conditions (0.1MPa, 20 ℃), the slit length just too far for the flame to pass through is 25 mm; the maximum experimental safety clearance MESG is as follows according to the applicable gas medium of the flame arrester:

a) the flame arrester is suitable for II A1 grade (MESG is more than or equal to 1.14mm) gas;

b) flame arrestors suitable for class II A (MESG > 0.9mm) gases;

c) the flame arrester is suitable for II B1 grade (MESG is more than or equal to 0.85mm) gas;

d) the flame arrester is suitable for II B2 grade (MESG is more than or equal to 0.75mm) gas;

e) the flame arrester is suitable for II B3 grade (MESG is more than or equal to 0.65mm) gas;

f) the flame arrester is suitable for II B-grade gas (MESG is more than or equal to 0.5 mm);

g) the flame arrester is suitable for II C class (MESG is less than 0.5mm) gas.

In the figure 1, the surface of the fire retardant core is provided with a right spiral groove 4, the cross section bottom of the spiral groove 4 is flat, two side walls of the spiral groove 4 are parallel and are perpendicular to the spiral groove of the shaft of the fire retardant core 3, when the tempering flame 8 is arranged between the safety device 1 of the gas stove and the gas outlet end 12 of the gas stove, because the diameters of the spiral groove or the straight groove channel 15 in the safety device 1 of the gas stove are all smaller than the critical diameter, the tempering flame 8 is spread from the gas outlet end 12, when the tempering flame passes through the inner wall 18 of the spiral groove or the straight groove channel 15 of the safety device 1 of the gas stove, because the inner wall 18 of the spiral groove or the straight groove channel 15 absorbs a large amount of heat of the tempering flame 8, the tempering flame 8 is radiated to the degree that the flame can not pass through the spiral groove or the straight groove channel 15 and then is spread to the gas source 13, the tempering flame 8 is extinguished in the spiral groove or the straight groove channel 15, the maximum channel diameter at this time is called as the critical diameter, according to the standard book number ISB978-7-111 and 27542-8, page 34, the last 6 lines, for example, when H2 and air are mixed according to the stoichiometric ratio in the air inlet pipe 2, the critical diameter is 0.9 mm; when CH4 and air are mixed 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. The metal spiral or straight groove channel with the aperture smaller than the critical diameter is utilized to prevent the passage of the tempering flame 8, thereby effectively preventing the occurrence of the tempering explosion accident; meanwhile, due to the ventilation of the spiral groove or straight groove channel 15, when the normal operation of the two cooking ranges is not affected, the gas source 13 supplies the gas 7 to the gas device 14 through the pressure reducing valve 9 on the gas tank or the pressure reducing valve 10 on the gas pipeline through the gas hose 6, and the arrow direction in the figure is the gas supply direction of the gas 7.

In fig. 3-4, the gas inlet end 11 is a pagoda segment used for connecting a gas stove 17 with a gas hose 6, a gas inlet pipe 2 is arranged on the surface of a fire retardant core 3, the bottom of the spiral groove 4 is in the shape of an outward convex arc, two side walls of the spiral groove 4 are opened outwards, the gas inlet pipe 2 and a welding point 5 of the fire retardant core 3, and other structures and working principles are the same as those in fig. 1 and fig. 2.

In fig. 5-6, the gas inlet end 11 is a pagoda segment used for connecting a gas stove 17 with a gas hose 6, a gas inlet pipe 2 is arranged on the surface of a fire retardant core 3, the straight groove 4 is parallel to the shaft of a safety device 1 of the gas stove, the cross section bottom of the straight groove 4 is straight, two side walls of the straight groove 4 are outwards opened, the gas inlet pipe 2 and an extrusion fixing point 20 of the fire retardant core 3, and other structures and working principles are as described in fig. 1 and fig. 2.

In fig. 7, the gas inlet end 11 is a universal joint of a gas stove 17 with a pagoda joint, one end of the pagoda joint is connected with a gas hose 6, the surface of the fire retardant core 3 is provided with a reticulate pattern knurling groove 19, and the fire retardant core is tightly sleeved and connected with a universal joint 21 of the gas stove 17 to form a safety device of the gas stove, at least one gas inlet pipe 2 and a welding point 5 of the fire retardant core 3 are welded together by metal spot at the gas inlet of the universal joint of the fire retardant core 3 and the gas stove 17, the universal joint 21 is composed of a sealing ring 22, a fastening nut 23 of the universal joint and a pagoda joint elbow 24 of the universal joint, can turn 360 degrees, and can be independently assembled and disassembled on the gas stove 17.

In fig. 8, the fire barrier core 3 is a cylinder with at least one coaxial left-handed spiral and at least one right-handed spiral groove 4 on the outer surface.

In fig. 9, 4 spiral grooves or straight grooves 4 with the sections of inward convex arc bottoms and outward open two side walls are arranged on the surface of the fire retardant core 3.

In fig. 10, 4 spiral grooves or straight grooves 4 with the sections of inward convex arc bottoms, outward open semi-elliptical bottoms and side walls are arranged on the surface of the fire retardant core 3.

In fig. 11, 4 spiral grooves or straight grooves 4 with triangular sections and two side walls opening outwards are arranged on the surface of the fire retardant core 3.

In fig. 12, 4 spiral grooves or straight grooves 4 with arc-shaped sections and outwards opening openings are arranged on the surface of the fire retardant core 3.

In fig. 9-12, β is an included angle between two sides of the cross section of the spiral groove or the straight groove 4, and β is greater than or equal to 0 ° and less than or equal to 180 °.

The air inlet pipe 2 and the fire retardant core 3 are made of metal with good heat conductivity, such as stainless steel, iron, aluminum or copper, which is not easy to oxidize in combustion.

The fire retardant core 3 is extruded and formed by a thread rolling machine or a thread rolling machine with a spiral line strip or straight line strip die corresponding to the fire retardant core; or the bar is processed into a spiral groove or a straight groove 4 by a lathe, and then is cut into a fire retardant core 3 covered by the air inlet pipe 2.

The invention relates to a safety device of a gas stove, which is applied to gas heating, gas welding and gas cutting devices.

The safety device of the gas stove is preferably fixed at any point where the fire retardant core 3 is contacted with the inner wall 18 of the gas inlet pipe 2 by extrusion; or the fire retardant core 3 and the outermost end of the air inlet pipe 2 are connected by spot welding, and the two are fixed into a whole.

According to the safety device of the gas stove, a specially-arranged gas inlet end and a specially-arranged gas outlet end are omitted, and the gas inlet pipe 2 is used as the shell of the fire retardant core 3, so that the cost and the manufacturing cost are further greatly reduced, and convenience is brought to installation and use; the spiral groove channel is adopted, so that the passing of tempering flame is effectively blocked; the spiral groove or the straight groove of the fire retardant core can realize mass production by using a groove rolling machine or a thread rolling machine, so that the production cost is further reduced; the diameter of the section of the spiral groove or the straight groove of the fire retardant core is further limited by the existing explosion-proof critical diameter, so that 100 percent of gas can be blocked from backfire and explosion. No movable parts are needed, so the working is more reliable, no fault exists, and the maintenance is free.

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.