CN109539261B - Starting control method of gas burner - Google Patents

Abstract

A start control method of a gas burner, the burner comprises an air supply system, a ventilation pipeline, a combustion nozzle, a gas system and an ignition device, the gas system comprises a pressure stabilizing valve for controlling the combustion nozzle to work, a firing mechanism and a gas valve for controlling the firing mechanism to work, and the start control method comprises the following steps: starting self-checking, starting air supply and providing blowing air quantity, adjusting an air supply system and providing ignition air quantity, adjusting the air supply system and providing combustion air quantity, adjusting the air supply system and providing large-opening air quantity, and adjusting the pressure stabilizing valve to ensure that the fuel gas sprayed out of the combustor is fully combusted. Under the ignition air quantity, the stability of pre-ignition can be ensured; the setting of the combustion air volume ensures that the burner firstly passes through a stable working stage of low combustion when being started, thereby ensuring the safety and the flame stability in the starting process of the burner.

Description

Starting control method of gas burner

Technical Field

The invention relates to the technical field of burner starting control, in particular to a starting control method of a gas burner.

Background

A burner is an apparatus for converting a substance into heat energy through a chemical reaction of combustion, and includes an oil burner and a gas burner. The gas burner is a heat energy device which utilizes air and gas to burn according to a proper proportion, and is widely applied to production and life.

With the social development, economic progress, the improvement of the living standard of people and the acceleration of the life rhythm, more and more devices are used for directly or indirectly processing food by using heat generated by gas combustion. However, in the starting process of the existing burner, the air flow and the gas flow are mostly directly controlled in a fixed proportion, which not only affects the stability of flame when the burner is started, but also causes certain damage to the subsequent use of the burner.

Disclosure of Invention

The invention aims to provide a starting control method of a gas burner, which can ensure the stability and safety of flame when the burner is started.

The above object of the present invention is achieved by the following technical solutions:

a start control method of a gas burner, the burner comprises an air supply system, a ventilation pipeline, a combustion nozzle, a gas system and an ignition device, the gas system comprises a pressure stabilizing valve for controlling the combustion nozzle to work, a firing mechanism and a gas valve for controlling the firing mechanism to work, and the start control method comprises the following steps:

s1, starting self-checking, and carrying out self-checking on an air supply system, a ventilation pipeline, a combustion nozzle, a gas system and an ignition device of a combustor to ensure that the combustor is in a closed state;

s2, starting an air supply system and providing purging air quantity;

s3, adjusting an air supply system, providing ignition air quantity, controlling the ignition mechanism and the ignition device to work, and pre-igniting;

s4, adjusting an air supply system to provide combustion air quantity, and controlling the combustion nozzle and the pressure stabilizing valve to work so that the burner can stably spray fire for continuously presetting stable combustion time;

and S5, adjusting an air supply system to provide large opening air quantity, and adjusting the pressure stabilizing valve to enable the gas sprayed out of the combustor to be fully combusted.

By adopting the technical scheme, the setting of the starting self-check ensures that each structure of the burner is in a normal state before starting, the blowing air quantity is provided, the blowing of miscellaneous gas or impurities in the burner is realized, and the cleanliness of the burner is ensured; under the ignition air quantity, the stability of pre-ignition can be ensured; the setting of the combustion air volume ensures that the burner firstly passes through a stable working stage of low combustion when being started, thereby ensuring the safety and the flame stability in the starting process of the burner.

In S3, after the ignition device is ignited, the flame output by the ignition mechanism is detected, and the process proceeds to S4 after the flame is detected.

By adopting the technical scheme, the detection of the flame realizes the detection of the pre-ignition success state, thereby ensuring the normal start of the combustor.

As an improvement of the invention, in S3, if the flame output by the ignition mechanism is not detected within 2 seconds after the ignition device is ignited, the burner gives an alarm and controls the pressure stabilizing valve to close.

As a refinement of the present invention, the preset stable combustion time is not less than 3 seconds.

As a modification of the present invention, in S5, the opening degree of the pressure regulator valve is adjusted according to the air pressure passing through the ventilation duct, so that the gas entering the combustion nozzle is sufficiently combusted.

As an improvement of the invention, the air supply system comprises a shell with two communicated ends, a fan arranged in the shell and an air door controller positioned at an air inlet end of the shell, wherein the air door controller comprises a box body with two open ends and a plurality of baffle sheets sequentially arranged in the box body from top to bottom, and each baffle sheet is respectively connected with a single control piece for controlling the rotation of the corresponding baffle sheet.

Through adopting above-mentioned technical scheme, compare in the regulation of the rotational speed realization to the intake of directly adjusting the fan, realize the regulation to the intake through the start quantity of control list controlling piece, not only avoided the production of complicated devices such as converter to rise originally, also simplified control system and control mode simultaneously for the regulation of intake can be more simple direct.

As an improvement of the invention, the single control part comprises an electromagnet fixed on the outer wall of the box body, a clutch rod rotationally arranged on the output end of the electromagnet, a driven friction plate fixed on the clutch rod and a driving friction plate matched with the driven friction plate; the electromagnet is a push-pull electromagnet, and one end of the rotating shaft penetrates through the box body and is coaxially fixed with the driven friction plate.

As an improvement of the invention, the air door controller also comprises an opening indicator which comprises a dial fixed on the box body and a pointer fixed on the rotating shaft.

In conclusion, the beneficial technical effects of the invention are as follows:

1. due to the pre-ignition arrangement, direct ignition through a combustion nozzle is avoided, and the ignition safety of the combustor is improved to a certain extent;

2. the gradual adjustment of different air volumes can be matched with the ignition program of each process in the ignition process of the burner, so that the ignition process is more stable.

Drawings

FIG. 1 is a schematic structural view of an embodiment;

FIG. 2 is a schematic structural diagram of an air supply system in an embodiment;

FIG. 3 is a schematic structural view of a mount in the embodiment;

FIG. 4 is a schematic structural diagram of a gas system in the embodiment;

FIG. 5 is a schematic structural view of a combustion nozzle in an embodiment;

FIG. 6 is a schematic structural view of a mount in the embodiment;

FIG. 7 is a schematic structural view of a damper controller in an embodiment;

FIG. 8 is a schematic structural view of a single control unit in the embodiment;

fig. 9 is a schematic structural view of the limiting device in the embodiment.

In the figure, 1, an air supply system; 11. a housing; 111. a fan motor; 12. a damper controller; 13. a box body; 14. a baffle plate; 141. a rotating shaft; 142. a deflector rod; 15. a single control; 151. an active friction plate; 152. a driven friction plate; 153. a clutch lever; 154. an electromagnet; 16. a transmission member; 161. a worm; 162. a turbine; 17. a power motor; 18. a limiting device; 181. an upper limit switch; 182. a lower limit switch; 19. an opening indicator; 191. a dial scale; 192. a pointer; 2. a ventilation duct; 21. a mounting seat; 22. positioning a plate; 23. a bearing ring; 24. a connecting ring; 25. a connecting pipe; 26. a program controller; 27. a flame sensor; 28. an observation window; 29. a fan pressure taking device; 291. a gas pressure switch; 3. a combustion nozzle; 31. an air duct; 311. a closing structure; 32. a main air pipe; 33. a combustion supporting pipe; 34. a shunting chamber; 35. a shunt tube; 36. a nozzle; 361. a main gas hole; 362. a nozzle; 363. an auxiliary gas hole; 37. a pipe for conveying; 38. a flame stabilizing disc; 381. a tray body; 382. a through hole; 383. a flame guide groove; 384. a flange; 385. a chute; 386. a sliding port; 39. an air outlet ring; 4. a gas system; 41. a gas pipeline; 42. a pressure maintaining valve; 43. a butterfly valve; 44. an ignition tube; 45. a gas valve; 46. a flange seat; 5. an igniter; 51. an ignition head; 6. a support bar; 61. a sliding part; 7. a mounting member; 71. a support plate; 711. positioning a groove; 712. mounting holes; 72. a sleeve; 73. carrying out top thread; 74. a boss; 75. a containing groove; 76. an anti-loosening element; 77. a swing rod; 771. a protrusion; 78. a compression spring; 79. a placing table; 791. butterfly screw.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Example (b): the utility model provides a gas burner, as shown in figure 1, including air supply system 1, air pipe 2, combustion nozzle 3, gas system 4 and ignition, air supply system 1 includes casing 11, casing 11 is used for the gaseous one end of input to be the inlet end, the gaseous one end of output is for giving vent to anger the end, air pipe 2 is installed on the end of giving vent to anger of casing 11, both communicate the setting, combustion nozzle 3 is installed and is served at air pipe 2's the giving vent to anger, gas system 4 includes gas pipeline 41, gas pipeline 41 lets in and is connected with combustion nozzle 3 in air pipe 2, ignition installs in combustion nozzle 3.

As shown in fig. 2, the air supply system 1 further includes a fan impeller (not shown), a fan motor 111 and a damper controller 12, the fan impeller is composed of a cylindrical wheel with blades having a certain inclination angle, and is rotatably installed inside the housing 11, the fan motor 111 provides the fan impeller with operation power, the fan impeller rotates at a high speed to generate sufficient air pressure, so that the housing 11 can blow out sufficient air to meet the requirement of combustion; the damper controller 12 is installed at the air inlet end of the housing 11 to precisely control the variation of the amount of air introduced into the housing 11, and the air inlet end of the housing 11 is a damper.

As shown in fig. 2 and 3, an installation seat 21 is arranged on the air outlet end of the ventilation duct 2, the installation seat 21 includes a positioning plate 22, a circular through opening is formed in the center of the positioning plate 22, and the size of the through opening is slightly smaller than that of the air outlet end of the ventilation duct 2. A receiving ring 23 is arranged on one side of the positioning plate 22, and the shape and size of the receiving ring 23 are matched with the shape and size of the air outlet end of the ventilation pipeline 2, so that the receiving ring 23 can be tightly inserted into the air outlet end of the ventilation pipeline 2 and then fixed by bolts; the other side of the positioning plate 22 is provided with a connecting ring 24 with a size matched with the opening, and one end of the connecting ring 24 far away from the positioning plate 22 is fixedly connected with an air duct 31 of the combustion nozzle 3.

As shown in fig. 4, the combustion nozzle 3 further includes a main gas pipe 32 and a combustion-supporting pipe 33 concentrically disposed in the main gas pipe 32, two ends of the main gas pipe 32 are disposed in a closed manner, and are matched with a pipe wall of the combustion-supporting pipe 33 to form a closed diversion chamber 34 between the main gas pipe 32 and the combustion-supporting pipe 33, and two ends of the combustion-supporting pipe 33 are open to allow gas to flow normally. The peripheral surface of main trachea 32 is provided with a plurality of shunt tubes 35 that are the distribution of circumference array, shunt tubes 35 one end and branch chamber 34 intercommunication, the other end stretches out dryer 31 and installs nozzle 36 outward, the axial one end of every nozzle 36 seals and sets up, nozzle 36 has seted up main gas hole 361 (refer to fig. 5) towards one side of combustion-supporting pipe 33 axis and has installed spray tube 362 on main gas hole 361, nozzle 36 has seted up vice gas hole 363 on the lateral wall of main gas hole 361 opposite direction, the aperture of vice gas hole 363 is greater than the aperture of main gas hole 361. The outer peripheral surface of the main air pipe 32 is also integrally provided with a communicating pipe 37 communicated with the diversion chamber 34, the air inlet end of the communicating pipe 37 is fixed on the lower end surface of the air outlet end of the ventilating pipe 2, correspondingly, the lower end surface of the ventilating pipe 2 is provided with a connecting pipe 25, the connecting pipe 25 is communicated with the communicating pipe 37, and the other end of the connecting pipe 25 is communicated with a gas pipeline 41, so that the connection of the gas pipeline 41 and the combustion nozzle 3 is realized. Further, the number of the branch pipes 35 is even, the nozzles 36 of the branch pipes 35 located at opposite positions are located at the same position in the axial direction of the branch pipes 35, and the nozzles 36 of the adjacent branch pipes 35 have a positional difference in the axial direction.

As shown in fig. 5, a support plate 71 is disposed at the center of the circumferentially distributed shunt tubes 35, the support plate 71 is coaxial with the main air tube 32, and an opening is left in the middle of the support plate 71 to ensure the normal circulation of air; arc-shaped positioning grooves 711 are uniformly formed in the outer peripheral surface of the supporting plate 71, each flow dividing pipe 35 is abutted to the positioning grooves 711, the supporting plate 71 is clamped on the inner side of each flow dividing pipe 35 in a matching mode, meanwhile, the positioning grooves 711 play a limiting role in the flow dividing pipes 35, so that the air is prevented from shaking the flow dividing pipes 35 when flowing in the ventilation pipeline 2, and stability of the combustion nozzle 3 during combustion is guaranteed.

A flame stabilizing disc 38 which is coaxial with the main air pipe 32 is further arranged on the inner side of the shunt pipe 35, and the flame stabilizing disc 38 is arranged close to the nozzle 36 and is positioned on one side of the spray pipe 362 facing the main air pipe 32; the flame stabilizing disc 38 comprises a disc body 381, a through hole 382 is arranged in the middle of the disc body 381, a plurality of flame guide grooves 383 are arranged on the disc body 381 in an annular array with the through hole 382 as a circle center, and each flame guide groove 383 penetrates through the disc body 381; one end of the tray body 381, which is far away from the support plate 71, extends along the circumference to form an obliquely arranged flange 384, the diameter of the flange 384 is larger than that of the tray body 381, so that the flange 384 forms an open structure, correspondingly, the air outlet end of the air duct 31 adopts a closing structure 311 which is closed towards the center, a space is left between the flange 384 on the tray body 381 and the inner wall of the air duct 31, the space forms an air outlet ring 39 (refer to fig. 3) through the open structure and the closing structure 311, the nozzle 36 penetrates out of the air outlet ring 39, the main gas hole 361 and the nozzle 362 face the flame guide groove 383, and the auxiliary gas hole 363 is between the air outlet rings 39; when the nozzle is used for combustion, the main gas hole 361 and the spray pipe 362 spray gas towards the middle of the nozzle, the main combustion area is formed, the gas sprayed out of the auxiliary gas hole 363 combusts between the gas outlet rings 39 to form annular flame, the combustion is more stable, and the generated heat is higher.

The flame stabilizing discs 38 are supported on the supporting plate 71 through the supporting rod 6, the number of the supporting rods 6 is three, the flame stabilizing discs 38 are connected with the supporting rod 6 in a sliding mode, specifically, one end, facing the supporting plate 71, of the supporting rod 6 is provided with an internal threaded hole and is vertically fixed on the supporting plate 71 through a screw, one end, facing the flame stabilizing discs 38, of the supporting rod 6 is integrally provided with a sliding part 61 in a spherical shape, the diameter of the sliding part 61 is larger than that of a rod body of the supporting rod 6, correspondingly, one side, facing the supporting rod 6, of a disc body 381 of the flame stabilizing discs 38 is provided with an annular sliding groove 385 for the sliding part 61 to slide, and one side of the sliding groove 385; the sliding part 61 extends into the sliding groove 385 and is in sliding fit with the sliding groove 385, so that the sliding connection between the flame stabilizing disc 38 and the support rod 6 is realized, correspondingly, a blade 387 (refer to fig. 3) is fixedly connected to one side of the disc body 381, which is far away from the support plate 71, and the position corresponding to each flame guide groove 383, the blade 387 is obliquely arranged relative to the surface of the disc body 381, the blade 387 is obliquely covered above the notch of the flame guide groove 383, so that obliquely distributed openings are formed outside the flame guide groove 383, and when the airflow in the ventilation pipeline 2 passes through the flame guide groove 383 of the flame stabilizing disc 38, the airflow is matched with the obliquely arranged blade 387, so that the airflow pushes the flame stabilizing disc 38 to rotate around the axis of the main air pipe 32.

As shown in fig. 4, a pressure stabilizing valve 42 is installed at an air inlet end of a gas pipeline 41 of the gas system 4, and a gas pressure gauge and a pressure switch are correspondingly configured, the gas pipeline 41 regulates the flow rate of gas by controlling the opening degree of an opening and closing member in a valve body of the pressure stabilizing valve 42, reduces the pressure of the gas, and regulates the opening degree of the opening and closing member by the action of the pressure after the valve, so that the pressure after the valve is kept in a certain range, and the outlet pressure is kept in a set range under the condition that the inlet pressure is constantly changed, so that the safety of the gas system 4 is ensured; a butterfly valve 43 and a servo motor for controlling the butterfly valve 43 are installed between the gas outlet end of the gas pipeline 41 and the connecting pipe 25, and the opening and closing of the gas pipeline 41 are controlled through the butterfly valve 43.

As shown in fig. 4, the gas system 4 further includes a firing mechanism, the firing mechanism includes a firing tube 44, a gas valve 45 is installed at an air inlet end of the firing tube 44, and the gas valve 45 is used for cutting off, connecting and adjusting the gas in the firing tube 44 to ensure the safety of the firing tube 44; a three-way flange seat 46 is installed between the air inlet end of the ignition tube 44 and the air inlet end of the gas pipeline 41, one end of the flange seat 46 is an air inlet end, the other two ends are air outlet ends, the air inlet end is communicated with a gas source, and the two air outlet ends are respectively communicated with the air inlet ends of the gas valve 45 and the pressure stabilizing valve 42.

As shown in fig. 5, the air outlet end of the ignition tube 44 extends into the ventilation duct 2 and is fixed to the support plate 71, and a mechanical seal is used between the ignition tube 44 and the ventilation duct 2. The support plate 71 is provided with a plurality of mounting holes 712, the air outlet end of the ignition tube 44 passes through one of the mounting holes 712 and is positioned between the support plate 71 and the flame stabilizing disc 38, and the ignition tube 44 is fixed on the support plate 71 through a mounting member 7. The mounting part 7 comprises a sleeve 72, the inner diameter of the sleeve 72 is matched with the outer diameter of the ignition tube 44, the sleeve 72 can be tightly sleeved outside the ignition tube 44, a threaded hole is formed in the wall of the sleeve 72 in a penetrating mode in the radial direction, a jackscrew 73 is connected with the threaded hole, the jackscrew 73 is screwed, the end portion of the jackscrew is abutted to the ignition tube 44, and therefore the sleeve 72 is fixedly connected with the ignition tube 44, an annular boss 74 (refer to fig. 6) is formed in one end, facing the supporting plate 71, of the sleeve 72 in an extending mode along the axial line, the outer diameter of the boss 74 is matched with the inner diameter of the mounting hole 712, the height of the boss 74 is larger than the thickness of the supporting plate 71, after the boss 74 is embedded in the mounting hole 712, the end face of the sleeve.

As shown in fig. 6, the sleeve 72 is provided with a locking member 76 for preventing the boss 74 from coming off from the mounting hole 712 of the support plate 71, the locking member 76 includes a swing rod 77, the outer surfaces of the sleeve 72 and the boss 74 are provided with accommodating grooves 75 distributed along the axis, the swing rod 77 is rotatably disposed in the accommodating groove 75 through a pin shaft, one end of the swing rod 77 is located on the sleeve 72, the other end of the swing rod 77 is located on the boss 74 and passes through the end portion of the boss 74, the pin shaft is disposed in the middle of the swing rod 77, and is rotatably disposed on the side wall of the accommodating groove 75, so that the two ends of the swing rod 77.

The part of the accommodating groove 75 positioned on the surface of the sleeve 72 is provided with a compression spring 78, the axis of the compression spring 78 points to the axis of the swing rod 77, the compression spring 78 is positioned below the swing rod 77, one end of the compression spring is fixedly connected with the lower surface of the swing rod 77, and the other end of the compression spring is fixedly connected with the bottom wall of the accommodating groove 75. The spring force of the compression spring 78 always acts on the end of the swing link 77 close to the sleeve 72, so that the end of the swing link 77 close to the boss 74 always abuts against the boss 74 without being affected by an external force. The part of the accommodating groove 75 positioned on the surface of the sleeve 72 is also provided with a mounting table 79, the mounting table 79 is positioned above the swing rod 77, a threaded hole is formed in the mounting table 79, a butterfly screw 791 is connected with the mounting table 79 through the threaded hole in a threaded manner, and the end part of the butterfly screw 791 penetrates through the mounting table 79 to be abutted against the swing rod 77; when the thumb screw 791 is rotated, the thumb screw 791 moves towards the swing rod 77 along the axis thereof, so that the swing rod 77 is extruded to move downwards, the compression spring 78 retracts, the other end of the swing rod 77, namely the end of the swing rod 77 located at the boss 74, correspondingly moves upwards until abutting against the inner wall of the mounting hole 712, then the thumb screw 791 is stopped rotating, and finally the boss 74 is limited in the mounting hole 712, so that the mounting piece 7 is prevented from being separated from the support plate 71, and the stability of the ignition tube 44 is ensured; when the mounting part 7 is disassembled and replaced, the butterfly screw 791 can be reversely rotated, and the disassembling process is simple and convenient.

Further, the end portion of the boss 74 is passed through by the swing rod 77, one side deviating from the groove bottom of the accommodating groove 75 is provided with the hemispherical protrusion 771, the protrusion 771 is matched with the side wall of the sleeve to form a clamping groove, and after the boss 74 passes through the mounting hole 712, according to the steps, the protrusion 771 rises along with the swing rod 77, so that the support plate 71 is clamped in the clamping groove formed by matching the sleeve with the protrusion 771, and the mounting part 7 is more stably fixed on the support plate 71.

The ignition device comprises an igniter 5 and an ignition head 51, wherein the igniter 5 is arranged on the outer wall of the air outlet end of the ventilation pipeline 2 (refer to fig. 2) and is used for controlling the on-off of the ignition head 51; the ignition head 51 is installed at the outlet end of the ignition tube 44 (refer to fig. 5), and can convert high voltage electricity into light energy and heat energy in the form of arc discharge to ignite the gas.

As shown in fig. 2, the ventilation duct 2 has a Z-shaped profile, and the air ejected from the air outlet end of the housing 11 flows into the ventilation duct 2, the Z-shaped arrangement makes the ventilation duct 2 form two continuous curves, and the air changes direction and decelerates speed continuously when flowing in the ventilation duct 2, so as to achieve the purpose of reducing noise. The outer wall of the ventilation pipeline 2 is provided with a program controller 26 for controlling the system program of the gas burner, so that the working process of the gas burner is more automatic; as shown in fig. 5, a flame sensor 27 and an observation window 28 are further installed in the ventilation duct 2 to know the internal condition of the ventilation duct 2 and ensure the safety of the gas burner during use. The ventilation pipeline 2 is also internally provided with a fan pressure taking device 29 and a fuel gas pressure switch 291, and the wind pressure in the ventilation pipeline 2 is monitored and controlled on line through the fan pressure taking device 29 so as to ensure the stable operation of the fuel gas burner.

As shown in fig. 7, the damper controller 12 includes a rectangular box 13 with two open ends, the box 13 is fixed on the air inlet end of the housing 11 by bolts, three blocking pieces 14 are sequentially arranged in the box 13 from top to bottom, and the air inlet end of the housing 11 can be closed by the cooperation of the three blocking pieces 14; the middle part of each baffle 14 is fixedly connected with a rotating shaft 141 which is horizontally arranged, the rotating shafts 141 are distributed along the width direction of the box body 13 and are rotatably arranged on the box body 13, so that each baffle 14 can rotate independently. A single control piece 15, a power motor 17 for providing power for the single control piece 15 and a transmission piece 16 for connecting the single control piece 15 and the power motor 17 are arranged on the outer side wall of the box body 13 and at the position corresponding to each baffle 14.

As shown in fig. 7 and 8, the single control element 15 includes a driving friction plate 151, a driven friction plate 152, a clutch lever 153 and an electromagnet 154, the electromagnet 154 is a push-pull electromagnet 154 and is fixed on the outer wall of the housing 11 through a mounting plate, a connecting hole is formed in the output end of the electromagnet 154, a bearing is installed in the connecting hole, the clutch lever 153 is rotatably connected in the connecting hole through the bearing, the driving friction plate 151 is coaxially fixed at one end of the clutch lever 153 away from the electromagnet 154, one end of the rotating shaft 141 facing the single control element 15 penetrates through the housing 13, and the driven friction plate 152 is coaxially fixed at the end of the rotating shaft 141; the friction surfaces of the driving friction plate 151 and the driven friction plate 152 are disposed opposite to each other.

The transmission part 16 comprises a worm 161 and a worm wheel 162 which can be engaged for transmission, the worm 161 is vertically arranged on one side of the box body 13, bearing seats are respectively arranged at two ends of the worm 161, and the worm is fixedly arranged on the box body 13 through the bearing seats; the number of the turbines 162 is three, and the turbines 162 are respectively arranged on the clutch rod 153 of each single control 15, and the turbines 162 and the clutch rod 153 are coaxial. A power motor 17 is provided at the tip of the worm 161 to rotate the worm 161.

As shown in fig. 9, the damper controller 12 further includes a limiting device 18, the limiting device 18 includes an upper limiting switch 181 and a lower limiting switch 182, both the upper limiting switch 181 and the lower limiting switch 182 are contact type limiting switches, as shown in fig. 9, the upper limiting switch 181 and the lower limiting switch 182 are mounted on a side wall of the box body 13 opposite to the single control 15, and correspondingly, a portion of the rotating shaft 141 extending out from the side wall extends along a radial direction to form a shift lever 142; when the flap 14 is in the horizontal open state, the shift lever 142 abuts against the upper limit switch 181, and when the flap 14 is in the closed state, the shift lever 142 abuts against the lower limit switch 182.

When the damper controller 12 works, the electromagnet 154 is firstly electrified to work, the electromagnet 154 pushes the clutch lever 153, the driving friction plate 151 makes a synchronous motion to be pressed and contacted on the driven friction plate 152, at the moment, the worm wheel 162 and the worm 161 on the clutch lever 153 are meshed, then the power motor 17 is started, the power motor 17 drives the worm wheel 162 to rotate, the clutch lever 153 is driven to rotate around the axis of the clutch lever through the meshing transmission of the worm wheel 161, so that the driving friction plate 151 and the driven friction plate 152 are driven to rotate, and finally the rotating shaft 141 is synchronously rotated, so that the opening or closing of the baffle plate 14 is realized; and the number of the rotation of the baffle plates 14 is adjusted by adjusting the number of the electromagnets 154, thereby realizing the multi-stage adjustment of the ventilation opening of the box body 13 and enabling the ventilation volume of the air supply system 1 to be more finely distinguished.

As shown in fig. 9, the damper controller 12 further includes an opening indicator 19, the opening indicator 19 includes a dial 191 fixed to the opposite side walls of the casing 13 and the single control 15, and a pointer 192 fixed to the rotating shaft 141, and the pointer 192 rotates in synchronization with the rotating shaft 141, and cooperates with the dial 191 to more visually display the rotation angle of the flap 14, so as to make finer adjustment of the angle of the flap 14.

A starting control method of a gas burner comprises the following steps:

s1, starting self-checking, and carrying out self-checking on an air supply system 1, a ventilation pipeline 2, a combustion nozzle 3, a gas system 4 and an ignition device of the combustor to ensure that the combustor is in a closed state.

And S2, starting the air supply system 1 and providing purging air quantity. Here, it is preferable to open the damper controller 12 to the maximum state so that the ventilation amount in the ventilation duct 2 becomes maximum.

And S3, adjusting the air supply system 1, providing ignition air quantity, controlling the ignition mechanism and the ignition device to work, and pre-igniting.

S4, adjusting the air supply system 1 to provide combustion air quantity, and controlling the combustion nozzle 3 and the pressure stabilizing valve 42 to work to enable the burner to stably spray fire for continuously presetting stable combustion time;

and S5, adjusting the air supply system 1 to provide large opening air quantity, and adjusting the pressure stabilizing valve 42 to ensure that the gas sprayed out of the combustor is fully combusted.

The specific starting process is as follows: when the gas burner is started, after the program controller 26 is powered on, the internal program self-check is started, meanwhile, the air door controller 12 controls the blocking piece 14 to rotate to enable the air door to be in a closed state, after the program self-check is finished, the air door controller is in a standby state, when the limit switches such as the gas pressure switch 291 and the like allow, the program controller 26 starts, the air door controller 12 is controlled to enable the air door to be opened to a big fire opening state, meanwhile, the fan motor 111 is started to provide purging air volume to blow in air for pre-purging, then the air door is opened to an ignition opening state to provide ignition air volume, and ignition is prepared. Throughout the pre-purge phase, the blower pressure measurement device 29 measures the air pressure, and the pre-purge process can only continue until the air pressure is maintained at a sufficiently high level. When the air door is in an ignition opening state, the gas valve 45 is opened, gas is firstly introduced into the ignition tube 44, then the igniter 5 works, and high voltage is output to the ignition head 51 to generate ignition electric sparks, so that pre-ignition is realized. Then the program controller 26 sends electricity to the pressure maintaining valve 42 and the butterfly valve 43, after the pressure maintaining valve 42 and the butterfly valve 43 are opened, the gas reaches the combustion nozzle 3, is mixed with the air provided by the air supply system 1, and then starts complete combustion. Within 2 seconds after the gas valve 45 is opened, the flame sensor 27 should detect the presence of flame, and only then does the program controller 26 continue the following procedure, otherwise, the program controller 26 locks and disconnects the pressure maintaining valve 42 and the butterfly valve 43 to stop supplying gas, and simultaneously alarms. After the ignition is normal and the stable combustion is carried out for the preset stable combustion time, the air door controller 12 drives the air door to be in a big-fire opening state, the gas pressure behind the pressure stabilizing valve 42 is adjusted according to the air pressure measured by the fan pressure taking device 29 to adjust the gas quantity, the purpose of stable and efficient combustion is achieved, and the preset stable combustion time is preferably 3 seconds. After that, the gas burner automatically realizes the switching of big and small fire and the shutdown according to the requirements of each limit switch. In addition, the flame sensor 27 and the fan pressure device 29 monitor the gas burner during the whole combustion process.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims (6)

1. A starting control method of a gas burner comprises an air supply system (1), a ventilation pipeline (2), a combustion nozzle (3), a gas system (4) and an ignition device, wherein the gas system (4) comprises a pressure stabilizing valve (42) for controlling the combustion nozzle (3) to work, a fire-leading mechanism and a gas valve (45) for controlling the fire-leading mechanism to work, and is characterized by comprising the following steps of:

s1, starting self-checking, and carrying out self-checking on an air supply system (1), a ventilation pipeline (2), a combustion nozzle (3), a gas system (4) and an ignition device of the combustor to ensure that the combustor is in a closed state;

s2, starting the air supply system (1) and providing purging air quantity;

s3, adjusting an air supply system (1) to provide ignition air quantity, and controlling the ignition mechanism and the ignition device to work to pre-ignite;

s4, adjusting an air supply system (1) to provide combustion air quantity, and controlling the combustion nozzle (3) and a pressure stabilizing valve (42) to work so that the burner can stably spray fire for continuously presetting stable combustion time;

s5, adjusting an air supply system (1) to provide large opening air quantity, and adjusting the pressure stabilizing valve (42) to enable gas sprayed from the combustor to be fully combusted;

the air supply system (1) comprises a shell (11) with two communicated ends, a fan arranged in the shell (11) and an air door controller (12) located at an air inlet end of the shell (11), wherein the air door controller (12) comprises a box body (13) with two open ends and a plurality of baffle sheets (14) sequentially arranged in the box body (13) from top to bottom, and the middle parts of the baffle sheets (14) are fixedly connected with rotating shafts (141) which are horizontally arranged, and each baffle sheet (14) is respectively connected with a single control piece (15) for controlling the corresponding baffle sheet (14) to rotate independently;

the single control piece (15) comprises an electromagnet (154) fixed on the outer wall of the box body (13), a clutch lever (153) rotatably arranged on the output end of the electromagnet (154), a driving friction plate (151) fixed on the clutch lever (153) and a driven friction plate (152) matched with the driving friction plate (151); the electromagnet (154) is a push-pull electromagnet (154), and one end of the rotating shaft (141) penetrates through the box body (13) and is coaxially fixed with the driven friction plate (152).

2. The startup control method of a gas burner according to claim 1, characterized in that: in S3, after the ignition device is ignited, the flame output from the ignition mechanism is detected, and the process proceeds to S4 after the flame is detected.

3. The startup control method of a gas burner according to claim 2, characterized in that: and S3, if the flame output by the ignition mechanism is not detected within 2 seconds after the ignition device is ignited, the burner gives an alarm and controls the pressure stabilizing valve (42) to be closed.

4. A start-up control method of a gas burner as set forth in claim 3, characterized in that: the preset stable combustion time is not less than 3 seconds.

5. The startup control method of a gas burner according to claim 1, characterized in that: and S5, adjusting the opening degree of the pressure stabilizing valve (42) according to the air pressure passing through the ventilating duct (2) so that the fuel gas entering the combustion nozzle (3) is fully combusted.

6. The startup control method of a gas burner according to claim 1, characterized in that: the damper controller (12) further comprises an opening indicator (19), and the opening indicator (19) comprises a dial (191) fixed on the box body (13) and a pointer (192) fixed on the rotating shaft (141).

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