A hydrogen stove with anti-explosion and anti-backfire function

Abstract

The present invention belongs to the technical field of hydrogen stoves, and is particularly an anti-explosion and anti-flashback hydrogen stove. In view of the problem that the rapid combustion performance of hydrogen may easily cause flashback at the moment of turning off the fire, the following scheme is proposed, including a stove panel with a circular hole in the middle, a metal fixing seat embedded in the circular hole, a transition clamp ring with an annular structure embedded in the middle of the metal fixing seat, which is made of a material with good heat insulation and thermal expansion prevention, thereby avoiding a large expansion rate after heating and causing the device to loosen, a burner structure is clamped in the middle of the transition clamp ring, and an air inlet is reserved at the bottom of the burner structure. When the fire is turned off, the piston column loses the gas thrust from the bottom, and under the action of gravity, it will quickly fall down to expose the explosion-proof pipe and block the circuit of the C-shaped side branch pipe, so that the ignited residual gas can only be ejected from the explosion-proof pipe, thereby preventing the phenomenon of flashback.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen stoves, and in particular to an explosion-proof and flashback-proof hydrogen stove. Background Art

[0002] With the continuous demand for energy in human society, the continuous depletion of non-renewable energy such as traditional fossil energy, and the increasingly harsh living environment, there is an urgent need for an efficient renewable green energy. Compared with other fossil fuels, hydrogen energy has a completely pollution-free combustion product of water, and the gas itself is non-toxic. With the increasing maturity of hydrogen production technologies such as coal-to-hydrogen, bio-hydrogen, electrolysis of water, and hydrocarbon hydrogen production, the source of hydrogen and the cost of production are gradually reduced, making it an ideal clean energy. The production and preparation of hydrogen are becoming more and more popular, and its cost is gradually decreasing. It is becoming a practical clean energy. Some areas have specially set up hydrogen supply pipelines, similar to gas pipelines, which can be delivered to residents' homes.

[0003] After searching, it was found that hydrogen burns very quickly. If no mechanism to prevent backfire is set when the fire source is turned off, the fire source can easily follow the air intake pipe into the stove, and even continue to follow the direction of the gas source through the solenoid valve. Therefore, we need a new type of hydrogen stove with good anti-backfire function to improve the safety performance of the hydrogen stove when in use. Summary of the invention

[0004] In view of the technical problem that the rapid combustion performance of hydrogen may cause flashback at the moment of turning off the fire, the present invention adopts the following technical solution:

[0005] A hydrogen stove that is explosion-proof and flashback-proof, comprising a stove panel with a circular hole in the middle, a metal fixing seat embedded in the circular hole, a transition clamp ring with an annular structure embedded in the middle of the metal fixing seat, which is made of a material with good heat insulation and thermal expansion prevention, thereby avoiding a large expansion rate after heating and causing the device to loosen, a burner structure is clamped in the middle of the transition clamp ring, and an air inlet hole is reserved at the bottom end of the burner head structure, an L-shaped anti-flashback pipe is sleeved at the bottom end of the air inlet hole, the L-shaped anti-flashback pipe as a whole comprises a vertical section and a horizontal section, and the circumferential inner wall of the vertical section of the L-shaped anti-flashback pipe is located in the middle and fixed with two mutually parallel annular retaining rings, and the two A piston column is slidably connected between the two annular retaining rings, and the height of the piston column is equal to two-thirds of the distance between the two annular retaining rings, and an explosion-proof tube is inserted under the annular retaining ring near the top of the circumferential outer wall of the L-shaped anti-backfire tube, and a silencer is sleeved on the end of the explosion-proof tube away from the L-shaped anti-backfire tube; a C-shaped branch pipe is inserted at the vertical end of the L-shaped anti-backfire tube near the lower annular retaining ring, and the outlet of the C-shaped branch pipe is inserted above the vertical end of the L-shaped anti-backfire tube located above the upper annular retaining ring; an intermediate connecting pipe is fixed at the inlet of the L-shaped anti-backfire tube, and an electromagnetic valve is arranged in the middle of the intermediate connecting pipe, and the access end of the intermediate connecting pipe is connected to a limited pressure feed valve.

[0006] Preferably, the middle of the metal fixing seat is raised upward, and the raised position is higher than the surface of the stove panel, which can reduce the corrosion of oil on the surface of the metal fixing seat; the lower surface of the metal fixing seat is reserved with a clamping protrusion that matches the circular hole, and the upper surface of the metal fixing seat is opened with four anti-skid grooves distributed in a central symmetrical manner, and the same cast iron support frame is fixed in the four anti-skid grooves.

[0007] Preferably, the silencer tube is in an L-shaped structure as a whole, and the outlet of the silencer tube is vertically oriented toward the middle position of the burner head structure, which can not only silence and extinguish the intercepted surplus hydrogen, but also redirect any fire that has not been extinguished to the upper burner head structure, which is safe and reliable.

[0008] Preferably, the circumferential outer wall of the piston column is provided with sealing ring grooves near both ends, and sealing rings are sleeved in the sealing ring grooves; the bottom end of the piston column is threaded with a self-locking screw, and the bottom end of the self-locking screw is fixed with a reset spring, and the bottom end of the reset spring is fixed with a self-locking threaded column; the horizontal section of the L-shaped anti-backfire tube is located directly below the piston column and is embedded with a sealing spiral tube that is compatible with the self-locking threaded column, and the bottom end outer wall of the sealing spiral tube is threaded with a secondary sealing cover; by providing the reset spring and self-locking screw, the sliding speed of the piston column can be accelerated at the moment of gas cutting, and the sluggish return response caused by rust on the outer wall of the piston column due to long-term use can be prevented, thereby ensuring that the piston column can operate effectively and normally for a long time.

[0009] Preferably, the burner head structure includes a burner head cover and a burner head base clamped in the transition clamping ring, the burner head cover and the burner head base are both annular parts with the same inner diameter, and annular grooves are provided on the opposite sides of the burner head cover and the burner head base; an air intake channel vertically connected to the outside of the bottom is reserved at the bottom of the groove of the burner head base, and the air intake channel is sealed and connected to the top of the L-shaped anti-backfire pipe; an annular convex ridge is reserved at the top of the burner head base near the outer ring, and a slot that is engaged with the annular convex ridge is reserved in the middle of the outer ring at the lower surface opening of the burner head cover Anti-dropping groove; a plurality of inclined grooves are provided at the top of the burner cover near the inner wall of the circumference, and the inclined grooves are provided with air holes connected to the annular groove; a diffusion plate is reserved on the inner wall of the annular groove of the burner cover, and the diffusion plate is located above the air inlet channel and does not contact the top of the air inlet channel; when in use, the high-speed incoming hydrogen can be impact-dispersed to other positions of the annular groove and then ejected from different air holes, so that the combustion flame is evenly distributed; and the two-petal burner structure is convenient for cleaning the dirt generated by combustion after a period of combustion.

[0010] Preferably, an inclined groove is reserved at the bottom of the annular groove of the burner base, and one end of the inclined groove close to the air inlet channel is higher than the other end, and a plurality of L-shaped blocks are fixed on the circumferential outer wall of the burner cover near the docking surface; a rotating groove compatible with the L-shaped block is reserved on the circumferential outer wall of the burner base near the top.

[0011] Preferably, the pressure-limiting feed valve includes a valve body welded together into a tubular structure that is thick in the middle and thin at both ends, a cylindrical cavity is reserved on the inner wall of the circumference of the middle section of the valve body, and spherical abutment grooves are reserved in the middle of both ends of the cylindrical cavity; a plurality of sliding holes symmetrically distributed in the center of the cylindrical cavity are opened at the end away from the air inlet end, and a abutment block is slidably connected in the middle of the cylindrical cavity, hemispherical plugs are reserved at both ends of the abutment block, and a buffer notch is opened in the middle of the abutment block, a baffle strip inserted into the buffer notch is fixed to the inner wall of the cylindrical cavity, and the baffle strip is located close to the air inlet end. On the side near the outlet end, an adjusting spring is fixed to the other end of the surface of the baffle strip near the buffer notch, and under normal pressure conditions, a plug of the block seals the spherical groove at the air inlet end under the action of the adjusting spring to prevent gas from entering; three round rods symmetrically distributed in the center are fixed to the end of the circumferential outer wall of the block near the sliding hole; this ensures that when the intake air pressure changes, the block always maintains the designed path for reciprocating movement, and then ensures that the block blocks the outlet when sudden high pressure occurs, thereby preventing the occurrence of deflagration caused by sudden high pressure.

[0012] Preferably, the metal fixing seat is provided with a through hole near the transition clamp ring, and an oil-proof cover is hingedly connected to the upper surface of the metal fixing seat near the through hole, a metal support cover with an opening upward and a rectangular box-shaped structure as a whole is arranged below the stove panel, and an air vent is reserved in the middle of the metal support cover, a connecting pipe notch is provided in the metal support cover near the air inlet end of the pressure-limiting feed valve, and a fixing frame for clamping the valve body is fixed to the bottom inner wall of the metal support cover, which can provide certain protection for related devices and prevent damage during installation or maintenance.

[0013] Preferably, an ignition mechanism is provided at the bottom of the metal support cover near the bottom of the oil-proof cover, and the ignition mechanism includes a guide rail arranged on the inner wall of the bottom of the metal support cover, and the guide rail includes two C-shaped slide grooves whose openings are opposite, parallel to each other and extend vertically upward, and the same ignition needle holder is slidably connected between the two C-shaped slide grooves, and an ignition needle is fixed on the upper surface of the ignition needle holder; the top end of the ignition needle can break through the blockage of the oil-proof cover and reach the top edge of the stove head cover as the ignition needle holder rises; therefore, when in use, when ignition is needed, it is only necessary to control the ignition needle holder to move up, and after the ignition is completed, it can be retracted to the bottom of the stove panel to form protection, which can not only prevent high-temperature baking, but also prevent oil stains, thereby improving the service life of the ignition needle and ensuring the ignition efficiency each time.

[0014] Preferably, both sides of the ignition needle holder are respectively reserved with anti-twist sliding blocks that are symmetrical and slidably connected in the C-shaped sliding groove, and the bottom ends of the anti-twist sliding blocks are fixed with return springs; an axle rod seat is fixed to the bottom of the metal support cover near the guide slide rail, and two short axles and long axles parallel to each other are arranged on the top of the axle rod seat, a spoon-shaped tilting rod is fixed in the middle of the short axle, and the spoon-shaped tilting rod includes a half gear and a lower pull rod fixed together, a traction rope is fixed between the end of the lower pull rod and the lower surface of the ignition needle holder, a rope winding roller and a driven gear are fixed at both ends of the long shaft, and the same double-sided rack is meshed between the driven gear and the half gear, an anti-twist guide rod is slidably inserted in the middle of the double-sided rack, and a compression spring 1 is fixed between the bottom end of the double-sided rack and the bottom inner wall of the metal support cover; the elastic force of the compression spring 1 is greater than the elastic force of the return spring; a pull rope is wrapped around the circumferential outer wall of the rope winding roller, and A fixed pulley is fixed on the lower surface of the stove panel near the lower surface of the rope winding roller; a knob mounting hole is opened on the stove panel near the oblique upper part of the rope winding roller, and a sliding bearing is embedded in the knob mounting hole, an ignition pressure rod is slidably connected in the sliding bearing, a pressure plate is fixed on the bottom end of the ignition pressure rod, a rotating clamp is rotatably sleeved on the circumferential outer wall of the pressure plate, and the other end of the pull rope passes around the fixed pulley and is fixed on the upper surface of the rotating clamp; a bow frame is fixed on the inner wall of the bottom of the metal support cover just below the ignition pressure rod, and a tightening spring is fixed between the top of the bow frame and the lower surface of the pressure plate, and a switch pointer is fixed on the upper surface of the stove panel near the knob mounting hole; a switch pressing knob is fixed on the top of the ignition pressure rod; through the ignition mechanism set up, when ignition is needed in use, you only need to press the switch pressing knob downward, and when resetting, you only need to stop pressing the connection block, and rotation will not affect the traction of the pull rope.

[0015] The beneficial effects of the present invention are:

[0016] 1. By setting an L-shaped anti-backfire pipe with a silencer, when ventilation and ignition are performed, the high-pressure and high-speed airflow from the bottom can directly push down the piston column slidingly connected between the two annular retaining rings to expose the inlet of the C-shaped branch pipe. At this time, hydrogen will enter from the C-shaped branch on the side to the burner head structure at the top; the pressure-limiting inlet valve can effectively prevent the occurrence of deflagration due to excessive gas pressure during gas supply. When the fire is turned off, the piston column loses the gas thrust from the bottom and will fall rapidly under the action of gravity to expose the explosion-proof pipe while blocking the circuit of the C-shaped branch pipe, so that the ignited residual gas can only be ejected from the explosion-proof pipe, thereby preventing the occurrence of backfire.

[0017] 2. By setting the silencer pipe with the outlet facing the middle position of the bottom of the furnace head structure, not only can the intercepted surplus hydrogen be silenced and fire extinguished, but also the fire that has not been extinguished can be redirected to the upper part of the furnace head structure in case of failure, which is safe and reliable.

[0018] 3. The reset tension spring and self-locking screw can accelerate the sliding speed of the piston column at the moment of air failure, and prevent the outer wall of the piston column from rusting due to long-term use, which will cause the return reaction to be slow, ensuring that the piston column can operate effectively and normally for a long time.

[0019] 4. By setting the inclined groove, the slag produced during normal combustion can be temporarily accumulated at the bottom to prevent it from falling into the air intake channel; and the rotating slot and the L-shaped block can tightly fix the burner head structure to prevent the burner head cover from bouncing up due to the impact of high-pressure gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of a hydrogen stove that is explosion-proof and flashback-proof proposed by the present invention;

[0021] Figure 2 A schematic diagram of the bottom structure of a hydrogen stove that is explosion-proof and flashback-proof proposed by the present invention;

[0022] Figure 3 This is a schematic diagram of a half-cut three-dimensional structure of a hydrogen stove that is explosion-proof and flashback-proof before use proposed by the present invention;

[0023] Figure 4 A schematic diagram of a half-section three-dimensional structure of a hydrogen stove that is explosion-proof and flashback-proof proposed by the present invention when ignited;

[0024] Figure 5 This is a schematic diagram of the overall structure of an ignition mechanism in a hydrogen stove that is explosion-proof and flashback-proof proposed by the present invention;

[0025] Figure 6 This is a schematic diagram of the assembly structure of a burner head structure of a hydrogen stove that is explosion-proof and flashback-proof proposed by the present invention;

[0026] Figure 7 A schematic diagram of the explosion structure of a burner base in a hydrogen stove that is explosion-proof and flashback-proof proposed by the present invention;

[0027] Figure 8 A schematic diagram of the bottom structure of a burner cover of a hydrogen stove that is explosion-proof and flashback-proof proposed by the present invention;

[0028] Fig. 9 An exploded view of an ignition needle holder in a hydrogen stove that is explosion-proof and flashback-proof proposed by the present invention;

[0029] Fig.10 A schematic diagram of a half-section three-dimensional structure of an L-shaped anti-flashback tube in a hydrogen stove that is anti-explosion and anti-flashback proposed by the present invention;

[0030] Fig.11A schematic diagram of a half-sectioned three-dimensional structure of a valve body of a pressure-limiting inlet valve in a hydrogen stove that is explosion-proof and flashback-proof proposed by the present invention;

[0031] Fig.12 This is a schematic diagram of the installation position structure of the L-shaped anti-flashback pipe in the second embodiment of the anti-explosion and anti-flashback hydrogen stove proposed by the present invention;

[0032] Fig.13 This is a schematic diagram of the three-dimensional structure of the L-shaped anti-flashback tube in the third embodiment of the anti-explosion and anti-flashback hydrogen stove proposed by the present invention.

[0033] In the figure: 1. stove panel; 2. cast iron support frame; 3. metal fixing seat; 301. perforation; 302. knob installation hole; 4. stove cover; 401. inclined notch; 402. air intake channel; 403. inclined groove; 404. annular ridge; 405. L-shaped block; 406. anti-drop groove; 5. switch indicator; 6. switch push knob; 7. oil-proof cover; 8. guide rail; 9. transition clamp; 10. stove base; 11. L-shaped anti-backfire pipe; 1101. annular retaining ring; 1102. explosion-proof pipe; 1103. sealing ring; 1104. reset tension spring; 1105. self-locking threaded column; 12. solenoid valve; 13. pressure-limiting feed Valve; 1301, baffle strip; 1302, adjusting spring; 14, pipe notch; 15, middle pipe; 16, silencer; 17, metal support cover; 18, ignition needle support seat; 19, double-sided rack; 20, driven gear; 21, pull rope; 22, rope roller; 23, shaft rod seat; 24, compression spring one; 25, anti-twist guide rod; 26, spoon-shaped tilt rod; 27, ignition needle; 28, C-shaped branch pipe; 29, round rod; 30, block; 31, fixing frame; 32, piston column; 33, bow frame; 34, sliding bearing; 35, ignition pressure rod; 36, rotating clamp ring; 37, reset spring; 38, connecting elbow; 39, hydrogen stove head. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0035] Embodiment 1, refer to Figure 1-Figure 11A hydrogen stove with anti-explosion and anti-flashback, comprising a stove panel 1 with a circular hole in the middle, a metal fixing seat 3 embedded in the circular hole, a transition clamp ring 9 with an annular structure embedded in the middle of the metal fixing seat 3, which is made of a material with good heat insulation performance and anti-thermal expansion, thereby avoiding a large expansion rate after heating and causing the device to loosen, a burner structure is clamped in the middle of the transition clamp ring 9, and an air inlet hole is reserved at the bottom end of the burner head structure, an L-shaped anti-flashback pipe 11 is sleeved at the bottom end of the air inlet hole, and the L-shaped anti-flashback pipe 11 as a whole includes a vertical section and a horizontal section, Two parallel annular retaining rings 1101 are fixed to the inner wall of the vertical section of the L-shaped anti-backfire pipe 11, and a piston column 32 is slidably connected between the two annular retaining rings 1101. The height of the piston column 32 is equal to two-thirds of the distance between the two annular retaining rings 1101. An explosion-proof pipe 1102 is inserted below the annular retaining ring 1101 near the top of the circumferential outer wall of the L-shaped anti-backfire pipe 11, and a silencer pipe 16 is sleeved on one end of the explosion-proof pipe 1102 away from the L-shaped anti-backfire pipe 11; the vertical end of the L-shaped anti-backfire pipe 11 is close to the annular retaining ring below. A C-shaped branch pipe 28 is inserted at the retaining ring 1101, and the outlet of the C-shaped branch pipe 28 is inserted above the vertical end of the L-shaped anti-backfire pipe 11 located above the annular retaining ring 1101; an intermediate pipe 15 is fixed at the inlet of the L-shaped anti-backfire pipe 11, and a solenoid valve 12 is arranged in the middle of the intermediate pipe 15, and the access end of the intermediate pipe 15 is connected to a limited pressure feed valve 13; by arranging the L-shaped anti-backfire pipe 11 with a silencer 16, the high-pressure and high-speed airflow from the bottom can directly slide and connect the two sections of the annular retaining ring 11 during ventilation and ignition. 01, the piston column 32 is pushed down to expose the entrance of the C-shaped branch pipe 28. At this time, hydrogen will enter from the side C-shaped branch to the top of the burner head structure; the pressure-limiting feed valve 13 can effectively prevent the excessive gas pressure from causing deflagration when the gas is supplied. When the fire is turned off, the piston column 32 loses the gas thrust from the bottom and will fall rapidly under the action of gravity to expose the explosion-proof pipe 1102, while also blocking the circuit of the C-shaped branch pipe 28, so that the ignited residual gas can only be ejected from the explosion-proof pipe 1102, thereby preventing the occurrence of backfire.

[0036] In the present invention, the middle of the metal fixing seat 3 is raised upward, and the raised position is higher than the surface of the stove panel 1, which can reduce the corrosion of the surface of the metal fixing seat 3 by oil stains; the lower surface of the metal fixing seat 3 is reserved with a bulge that matches the circular hole, and the upper surface of the metal fixing seat 3 is opened with four anti-skid grooves distributed in a central symmetrical manner, and the same cast iron support frame 2 is fixed in the four anti-skid grooves.

[0037] Reference Figure 3 and Fig.10The silencer 16 is in an L-shaped structure as a whole, and the outlet of the silencer 16 is vertically directed toward the middle position of the burner structure. It can not only silence and extinguish the intercepted surplus hydrogen, but also redirect the fire that has not been extinguished to the upper part of the burner structure, which is safe and reliable.

[0038] Reference Fig.10 , the circumferential outer wall of the piston column 32 is provided with sealing ring grooves near both ends, and sealing rings 1103 are sleeved in the sealing ring grooves; the bottom end of the piston column 32 is threaded with a self-locking screw, and the bottom end of the self-locking screw is fixed with a reset spring 1104, and the bottom end of the reset spring 1104 is fixed with a self-locking threaded column 1105; the horizontal section of the L-shaped anti-backfire tube 11 is located directly below the piston column 32 and is embedded with a sealing spiral tube that is compatible with the self-locking threaded column 1105, and the bottom outer wall of the sealing spiral tube is threaded with a secondary sealing cover; through the reset spring 1104 and the self-locking screw, the sliding speed of the piston column 32 can be accelerated at the moment of gas cutting, and the sluggish return reaction caused by rust on the outer wall of the piston column 32 due to long-term use can be prevented, ensuring that the piston column 32 can operate normally and effectively for a long time.

[0039] Reference Figure 3 , Figure 6-Figure 8 The burner structure includes a burner cover 4 and a burner base 10 clamped in the transition clamp ring 9. The burner cover 4 and the burner base 10 are both annular parts with the same inner diameter, and an annular groove is opened on the opposite sides of the burner cover 4 and the burner base 10; an air intake channel 402 vertically connected to the outside of the bottom is reserved at the bottom of the groove of the burner base 10, and the air intake channel 402 is sealed and connected to the top of the L-shaped backfire prevention tube 11; an annular convex ridge 404 is reserved at the top of the burner base 10 near the outer ring, and a clamping groove 404 is reserved in the middle of the outer ring at the lower surface opening of the burner cover 4. The burner cover 4 has a plurality of inclined grooves 401 at its top near the inner wall of the circumference, and the inclined grooves 401 are provided with air holes connected to the annular groove. A diffusion plate is reserved on the inner wall of the annular groove of the burner cover 4, and the diffusion plate is located above the air inlet channel 402 and does not contact the top of the air inlet channel 402. When in use, the high-speed hydrogen entering can be impact-dispersed to other positions of the annular groove and then ejected from different air holes, so that the combustion flame is evenly distributed. The two-petal burner structure makes it easy to clean the dirt generated by combustion after a period of combustion.

[0040] Reference Figure 7-Figure 8An inclined groove 403 is reserved at the bottom of the annular groove of the burner head base 10, and one end of the inclined groove 403 close to the air inlet channel 402 is higher than the other end, and a plurality of L-shaped blocks 405 are fixed to the circumferential outer wall of the burner head cover 4 near the docking surface; a rotating groove matched with the L-shaped block 405 is reserved near the top of the circumferential outer wall of the burner head base 10; through the set inclined groove 403, the slag generated during normal combustion can be temporarily accumulated at the bottom to prevent it from falling into the air inlet channel 402; and the rotating groove cooperates with the setting of the L-shaped block 405 to tightly fix the burner head structure to prevent the burner head cover 4 from bouncing up due to the impact of high-pressure gas.

[0041] Reference Fig.11 The pressure-limiting feed valve 13 includes a valve body welded together to form a tubular structure with a thick middle and thin ends. A cylindrical cavity is reserved on the inner wall of the circumference of the middle section of the valve body, and spherical grooves are reserved in the middle of both ends of the cylindrical cavity; a plurality of sliding holes symmetrically distributed in the center of the cylindrical cavity are opened at one end away from the air inlet end, and a stop block 30 is slidably connected in the middle of the cylindrical cavity, and hemispherical plugs are reserved at both ends of the stop block 30, and a buffer notch is opened in the middle of the stop block 30, and a baffle strip 1301 inserted into the buffer notch is fixed on the inner wall of the cylindrical cavity, and the baffle strip 1301 is located on the side close to the outlet end, and the baffle strip 1301 is located on the side close to the outlet end, and the baffle An adjusting spring 1302 is fixed to the other end of the surface of the slat 1301 near the buffer notch. Under normal pressure conditions, a plug of the block 30 seals the spherical groove at the air inlet end under the action of the adjusting spring 1302 to prevent gas from entering. Three round rods 29 are fixed to the end of the circumferential outer wall of the block 30 near the sliding hole, which are symmetrically distributed around the center. This ensures that the block 30 always maintains the designed path for reciprocating movement when the intake air pressure changes, and then ensures that the block 30 blocks the outlet when sudden high pressure occurs, thereby preventing deflagration caused by sudden high pressure.

[0042] Reference Figure 2-Figure 3 A through hole 301 is formed on the metal fixing seat 3 near the transition clamp ring 9, and an oil-proof cover 7 is hinged on the upper surface of the metal fixing seat 3 near the through hole 301. A metal support cover 17 with an opening upward and a rectangular box-shaped structure as a whole is arranged below the stove panel 1, and an air vent is reserved in the middle of the metal support cover 17. A pipe notch 14 is formed on the metal support cover 17 near the air inlet end of the pressure-limiting feed valve 13, and a fixing frame 31 for clamping the valve body is fixed to the bottom inner wall of the metal support cover 17, which can play a certain protective role on the relevant devices and prevent damage during installation or maintenance.

[0043] Reference Figure 7 and Fig. 9An ignition mechanism is arranged at the bottom of the metal support cover 17 near the bottom of the oil-proof cover 7, and the ignition mechanism includes a guide slide rail 8 arranged on the inner wall of the bottom of the metal support cover 17, and the guide slide rail 8 includes two C-shaped slide grooves whose openings are opposite, parallel to each other and extend vertically upward, and the same ignition needle holder 18 is slidably connected between the two C-shaped slide grooves, and an ignition needle 27 is fixed on the upper surface of the ignition needle holder 18; the top end of the ignition needle 27 can break through the blockage of the oil-proof cover 7 and reach the top edge of the stove head cover 4 as the ignition needle holder 18 rises; therefore, when in use, when ignition is needed, it is only necessary to control the ignition needle holder 18 to move up, and it can be retracted to the bottom of the stove panel 1 after the ignition is completed, forming protection, which can not only prevent high-temperature baking, but also prevent oil stains from falling, thereby improving the service life of the ignition needle 27 and ensuring the ignition efficiency each time.

[0044] Reference Figure 3-Figure 5 , Fig. 9 , symmetrical and slidably connected anti-twist sliders are reserved on both sides of the ignition needle holder 18, and the bottom ends of the anti-twist sliders are fixed with reset springs 37; the bottom of the metal support cover 17 is fixed with an axle rod seat 23 near the guide slide rail 8, and the top of the axle rod seat 23 is provided with two short shafts and a long shaft parallel to each other, and a spoon-shaped tilting rod 26 is fixed in the middle of the short shaft, and the spoon-shaped tilting rod 26 includes a half gear and a lower pull rod fixed together, and the end of the lower pull rod is connected to the lower end of the ignition needle holder 18. A traction rope is fixed between the surfaces, a rope winding roller 22 and a driven gear 20 are fixed at both ends of the long axis, and the same double-sided rack 19 is meshed between the driven gear 20 and the half gear, an anti-twist guide rod 25 is slidably inserted in the middle of the double-sided rack 19, and a compression spring 24 is fixed between the bottom end of the double-sided rack 19 and the bottom inner wall of the metal support cover 17; the elastic force of the compression spring 24 is greater than the elastic force of the reset spring 37; a pull rope 21 is wound around the circumferential outer wall of the rope winding roller 22, and the stove panel 1 A fixed pulley is fixed to the lower surface of the stove panel 1 near the lower surface of the rope winding roller 22; a knob mounting hole 302 is opened at the upper oblique side of the stove panel 1 near the rope winding roller 22, and a sliding bearing 34 is embedded in the knob mounting hole 302, and an ignition pressure rod 35 is slidably connected to the sliding bearing 34. A pressure plate is fixed to the bottom end of the ignition pressure rod 35, and a rotating clamp 36 is rotatably sleeved on the circumferential outer wall of the pressure plate. The other end of the pull rope 21 passes around the fixed pulley and is fixed to the upper surface of the rotating clamp 36; the bottom inner wall of the metal support cover 17 is located at A bow frame 33 is fixed just below the ignition pressure rod 35, and a tightening spring is fixed between the top of the bow frame 33 and the lower surface of the pressure plate, and a switch pointer 5 is fixed to the upper surface of the stove panel 1 near the knob mounting hole 302; a switch pressing knob 6 is fixed to the top of the ignition pressure rod 35; through the set ignition mechanism, when ignition is needed during use, it is only necessary to press the switch pressing knob 6 downward, and when resetting, it is only necessary to stop pressing the connecting block, and rotation will not affect the traction of the pull rope 21.

[0045] When the device is in use, when the hydrogen at the gas source enters the pressure-limiting feed valve 13, the setting of the electromagnetic valve 12 in the middle of the intermediate pipe 15 increases the air pressure inside the cylindrical cavity, thereby blocking the outlet hydrogen and preventing it from continuing to pass through the pressure-limiting feed valve 13; then, as the ignition mechanism is started, the ignition needle 27 rushes out of the perforation 301 and connects the circuit to start pulse ignition; at the same time, the electromagnetic valve 12 opens, and the hydrogen enters the L-shaped anti-backfire pipe 11; at this time, by setting the L-shaped anti-backfire pipe 11 with a silencer 16, when ventilation and ignition are performed, the high-pressure and high-speed The airflow directly pushes down the piston column 32 slidingly connected between the two annular retaining rings 1101 to expose the entrance of the C-shaped branch pipe 28. At this time, hydrogen will enter from the side C-shaped branch to the top burner structure and be ignited; when the fire is turned off, the piston column 32 loses the gas thrust from the bottom, and will fall rapidly under the combined effect of gravity and the reset spring 1104 to expose the pipe mouth of the explosion-proof pipe 1102 and also block the circuit of the C-shaped branch pipe 28, so that the ignited residual gas can only be ejected from the explosion-proof pipe 1102, thereby preventing the occurrence of backfire.

[0046] Example 2, refer to Fig.10 , Fig.12 On the basis of the first embodiment, the L-shaped anti-backfire tube 11 is a straight tube shape as a whole, and a connecting elbow 38 is screwed on its outlet end, and a hydrogen stove head 39 is fixed to the end of the connecting elbow 38 away from the L-shaped anti-backfire tube 11, and the hydrogen stove head 39 is another simplified structure of the stove head base 10.

[0047] Example 3, refer to Fig.13 The L-shaped anti-backfire tube 11 is a straight tube structure as a whole, and its outlet end is directly connected to the air inlet end of the hydrogen stove head 39.

[0048] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A hydrogen stove that is explosion-proof and flashback-proof, comprising a stove panel (1) with a circular hole in the middle, a metal fixing seat (3) embedded in the circular hole, a transition clamp (9) of an annular structure embedded in the middle of the metal fixing seat (3), a stove head structure clamped in the middle of the transition clamp (9), and an air inlet hole reserved at the bottom end of the stove head structure, and an L-shaped flashback-proof pipe (11) sleeved at the bottom end of the air inlet hole, characterized in that: The L-shaped anti-backfire pipe (11) as a whole comprises a vertical section and a horizontal section, and two mutually parallel annular retaining rings (1101) are fixed in the middle of the circumferential inner wall of the vertical section of the L-shaped anti-backfire pipe (11), and a piston column (32) is slidably connected between the two annular retaining rings (1101), and the height of the piston column (32) is equal to two-thirds of the distance between the two annular retaining rings (1101), and an explosion-proof pipe (1102) is inserted below the annular retaining ring (1101) near the top of the circumferential outer wall of the L-shaped anti-backfire pipe (11), and the explosion-proof pipe (1102) is away from the L A silencer pipe (16) is sleeved on one end of the L-shaped anti-backfire pipe (11); a C-shaped branch pipe (28) is inserted into the vertical end of the L-shaped anti-backfire pipe (11) near the lower annular retaining ring (1101), and the outlet of the C-shaped branch pipe (28) is inserted into the upper part of the annular retaining ring (1101) located at the vertical end of the L-shaped anti-backfire pipe (11); an intermediate pipe (15) is fixed at the inlet of the L-shaped anti-backfire pipe (11), and a solenoid valve (12) is arranged in the middle of the intermediate pipe (15), and the access end of the intermediate pipe (15) is connected to a pressure-limiting feed valve (13).

2. The anti-explosion and anti-flashback hydrogen stove according to claim 1, characterized in that: The middle of the metal fixing seat (3) is raised upward, and the raised position is higher than the surface of the stove panel (1), which can reduce the corrosion of the surface of the metal fixing seat (3) by oil stains; the lower surface of the metal fixing seat (3) is reserved with a clamping protrusion that matches the circular hole, and the upper surface of the metal fixing seat (3) is opened with four anti-skid grooves distributed in a central symmetrical manner, and the same cast iron support frame (2) is fixed in the four anti-skid grooves.

3. The anti-explosion and anti-flashback hydrogen stove according to claim 1, characterized in that: The silencer pipe (16) is in an L-shaped structure as a whole, and the outlet of the silencer pipe (16) is vertically oriented toward the middle position of the furnace head structure.

4. The anti-explosion and anti-flashback hydrogen stove according to claim 1, characterized in that: The circumferential outer wall of the piston column (32) is provided with sealing ring grooves near both ends, and sealing rings (1103) are sleeved in the sealing ring grooves; a self-locking screw is threadedly connected to the bottom end of the piston column (32), a reset spring (1104) is fixed to the bottom end of the self-locking screw, and a self-locking threaded column (1105) is fixed to the bottom end of the reset spring (1104); the horizontal section of the L-shaped anti-backfire tube (11) is located directly below the piston column (32), and a sealing spiral tube compatible with the self-locking threaded column (1105) is embedded therein, and a secondary sealing cover is threadedly connected to the outer wall of the bottom end of the sealing spiral tube.

5. The anti-explosion and anti-flashback hydrogen stove according to claim 1, characterized in that: The burner structure comprises a burner cover (4) and a burner base (10) clamped in the transition clamp ring (9); the burner cover (4) and the burner base (10) are both annular parts with the same inner diameter, and the burner cover (4) and the burner base (10) are provided with annular grooves on opposite sides; an air intake channel (402) vertically communicating with the outside of the bottom is reserved at the bottom of the groove of the burner base (10), and the air intake channel (402) is sealed and connected to the top of the L-shaped anti-backfire pipe (11); the top of the burner base (10) is close to An annular convex ridge (404) is reserved at the outer ring, and an anti-dropping groove (406) that engages with the annular convex ridge (404) is reserved in the middle of the outer ring at the opening of the lower surface of the burner cover (4); a plurality of inclined notches (401) are opened at the top of the burner cover (4) near the inner wall of the circumference, and each of the inclined notches (401) is provided with an air hole that communicates with the annular groove; a diffusion plate is reserved on the inner wall of the annular groove of the burner cover (4), and the diffusion plate is located above the air inlet channel (402) and does not contact the top of the air inlet channel (402).

6. The anti-explosion and anti-flashback hydrogen stove according to claim 5, characterized in that: The bottom of the annular groove of the burner base (10) is reserved with an inclined groove (403), and one end of the inclined groove (403) close to the air inlet channel (402) is higher than the other end, and a plurality of L-shaped clamping blocks (405) are fixed to the circumferential outer wall of the burner cover (4) close to the docking surface; and a rotating clamping groove compatible with the L-shaped clamping block (405) is reserved on the circumferential outer wall of the burner base (10) close to the top.

7. The anti-explosion and anti-flashback hydrogen stove according to claim 1, characterized in that: The pressure-limiting feed valve (13) comprises a valve body welded together to form a tubular structure with a thick middle and thin ends; a cylindrical cavity is reserved on the inner wall of the circumference of the middle section of the valve body, and spherical abutment grooves are reserved in the middle of both ends of the cylindrical cavity; a plurality of sliding holes are opened at one end of the cylindrical cavity away from the air inlet end and are symmetrically distributed in the center; a abutment block (30) is slidably connected in the middle of the cylindrical cavity; hemispherical plugs are reserved at both ends of the abutment block (30), and a buffer notch is opened in the middle of the cylindrical cavity; A baffle strip (1301) inserted into the buffer notch is fixed to the inner wall, and the baffle strip (1301) is located on the side close to the outlet end. An adjusting spring (1302) is fixed to the surface of the baffle strip (1301) at the other end close to the buffer notch. Under normal pressure conditions, a plug of the stopper (30) blocks the spherical stopper groove at the air inlet end under the action of the adjusting spring (1302); three round rods (29) distributed symmetrically with respect to the center are fixed to the end of the circumferential outer wall of the stopper (30) close to the sliding hole.

8. The anti-explosion and anti-flashback hydrogen stove according to claim 7, characterized in that: The metal fixing seat (3) is provided with a through hole (301) near the transition clamp ring (9), and an oil-proof cover (7) is hingedly connected to the upper surface of the metal fixing seat (3) near the through hole (301). A metal support cover (17) with an opening facing upward and forming a rectangular box-like structure as a whole is provided below the stove panel (1), and a vent hole is reserved in the middle of the metal support cover (17). The metal support cover (17) is provided with a pipe notch (14) near the air inlet end of the pressure-limiting feed valve (13), and a fixing frame (31) for clamping the valve body is fixed to the bottom inner wall of the metal support cover (17).

9. The anti-explosion and anti-flashback hydrogen stove according to claim 8, characterized in that: An ignition mechanism is arranged at the bottom of the metal support cover (17) near the bottom of the oil-proof cover (7), and the ignition mechanism includes a guide rail (8) arranged on the inner wall of the bottom of the metal support cover (17), the guide rail (8) includes two C-shaped slide grooves with openings facing each other and parallel to each other and extending vertically upward, and the same ignition needle holder (18) is slidably connected between the two C-shaped slide grooves, and an ignition needle (27) is fixed on the upper surface of the ignition needle holder (18); the top end of the ignition needle (27) can break through the blockage of the oil-proof cover (7) and reach the top edge of the stove head cover (4) as the ignition needle holder (18) rises.

10. The anti-explosion and anti-flashback hydrogen stove according to claim 9, characterized in that: The two sides of the ignition needle support seat (18) are respectively reserved with anti-twist sliding blocks which are symmetrical and slidably connected in the C-shaped slide groove, and the bottom ends of the anti-twist sliding blocks are fixed with return springs (37); the bottom of the metal support cover (17) is fixed with an axle rod seat (23) near the guide slide rail (8), and the top of the axle rod seat (23) is provided with two short shafts and a long shaft which are parallel to each other, and a spoon-shaped tilting rod (26) is fixed in the middle of the short shaft, and the spoon-shaped tilting rod (26) includes a half gear and a lower pull rod fixed together, and the lower pull rod A traction rope is fixed between the end of the long shaft and the lower surface of the ignition needle bracket (18), a rope winding roller (22) and a driven gear (20) are fixed to the two ends of the long shaft respectively, and a same double-sided rack (19) is meshed between the driven gear (20) and the half gear, an anti-twist guide rod (25) is slidably inserted in the middle of the double-sided rack (19), and a compression spring (24) is fixed between the bottom end of the double-sided rack (19) and the bottom inner wall of the metal support cover (17); the elastic force of the compression spring (24) is greater than that of the return spring (3 7) elastic force; a pull rope (21) is wound around the circumferential outer wall of the rope winding roller (22), and a fixed pulley is fixed to the lower surface of the stove panel (1) near the lower surface of the rope winding roller (22); a knob mounting hole (302) is opened at an oblique upper portion of the stove panel (1) near the rope winding roller (22), and a sliding bearing (34) is embedded in the knob mounting hole (302), an ignition pressure rod (35) is slidably connected to the sliding bearing (34), a pressure plate is fixed to the bottom end of the ignition pressure rod (35), and a circumferential outer wall of the pressure plate is rotatably sleeved A rotating clamp (36) is connected, and the other end of the pull rope (21) is passed around the fixed pulley and fixed to the upper surface of the rotating clamp (36); a bow frame (33) is fixed to the bottom inner wall of the metal support cover (17) just below the ignition pressure rod (35), and a tightening spring is fixed between the top of the bow frame (33) and the lower surface of the pressure plate; a switch pointer (5) is fixed to the upper surface of the stove panel (1) near the knob installation hole (302); and a switch pressing knob (6) is fixed to the top of the ignition pressure rod (35).

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