Burner and steam generating system using the burner

Abstract

The present invention belongs to the technical field of steam generators, and specifically relates to a burner and a steam generation system using the burner. The burner includes a combustion chamber, a premixing tube, and an air inlet pipe. The furnace cavity of the combustion chamber, the cavity of the premixing tube, and the cavity of the straight section of the air inlet pipe cooperate to form a straight vertical channel. The combustion chamber is covered with a furnace chamber for forming a furnace. A connecting pipe is provided on the wall of the furnace chamber to connect to the external environment. The burner has the advantages of compact structure, small size, low noise, energy saving, and high combustion efficiency. The steam generation system of the present invention includes a burner; so as to effectively improve the ignition efficiency and service life of the steam generator while reducing the operating threshold.

Description

Technical Field

[0001] The invention belongs to the technical field of steam generators, and specifically relates to a burner and a steam generating system using the burner. Background Art

[0002] Small steam generation systems are widely used in hotels, guesthouses, restaurants, food processing companies, and laundry industries. Existing steam generators on the market generally suffer from drawbacks such as high energy consumption, low thermal efficiency, and loud operating noise. This wastes a large amount of gas energy in my country each year, while also increasing carbon emissions and waste heat emissions, a problem that urgently needs to be addressed. Summary of the Invention

[0003] The present invention aims to overcome the shortcomings of the prior art by providing a burner that provides stable heat output while also possessing the advantages of a compact structure, small size, low noise, energy conservation, and high combustion efficiency. Another object of the present invention is to provide a steam generation system utilizing the burner, thereby lowering the operational requirements while effectively improving the ignition efficiency and service life of the steam generator.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A burner, characterized in that it includes a combustion chamber, a premixing tube and an air inlet pipe arranged in sequence from top to bottom along the vertical direction, the air inlet pipe is an L-shaped tube, and the air inlet pipe passes through the bottom end surface of the air inlet pipe from bottom to top and extends into the straight pipe section of the air inlet pipe; the furnace cavity of the combustion chamber, the premixing tube cavity and the straight pipe section of the air inlet pipe cooperate together to form a straight vertical channel; the combustion chamber is covered with a furnace chamber for forming a furnace, and a connecting pipe is provided at the wall of the furnace chamber to connect to the external environment.

[0006] Preferably, the combustion chamber includes an inner mesh cover and an outer mesh cover arranged coaxially with each other, and the inner mesh cover and the outer mesh cover are both barrel-shaped mesh covers with the barrel mouth facing downward, and the cover mouths of the two mesh covers are fixed on the bottom plate, and the top pipe mouth of the premixing pipe passes through the bottom plate and is connected to the cover cavity of the inner mesh cover.

[0007] Preferably, the inner mesh cover and the outer mesh cover are both covered with a layer of metal fiber sintered felt.

[0008] Preferably, a steam generating system using the burner is characterized in that: it includes the burner, and the furnace chamber is located in the heat exchange water tank cavity so as to be covered by water, the bottom wall of the heat exchange water tank constitutes the bottom plate; a heat exchange smoke pipe with a heat exchange function is arranged in the heat exchange water tank, the inlet of the heat exchange smoke pipe is connected to the furnace chamber, the outlet of the heat exchange smoke pipe is connected to the external atmospheric environment, and a first-level steam outlet is opened on the heat exchange water tank cavity; a steam box is arranged above the heat exchange water tank, and the steam box and the heat exchange water tank share a top plate, and the top plate is penetrated by a The connecting hole forms the primary steam outlet; the system also includes a steam filter cover with an upward barrel shape, a steam hole is provided on the barrel wall of the steam filter cover, and the steam filter cover is buckled on the connecting hole from bottom to top to connect the two; a secondary steam outlet is arranged at the steam box to connect external steam equipment; a water vapor separation baffle is provided at the top hole end of the connecting hole; the water vapor separation baffle first extends upward and then extends horizontally to the top of the connecting hole; the secondary steam outlet is opened on the top wall of the steam box above or behind the water vapor separation baffle.

[0009] Preferably, the connecting pipe vertically passes through the top wall of the furnace chamber, and the connecting pipe constitutes an explosion-proof pipe for preventing the pressure in the furnace chamber from exceeding the limit; a pressure relief valve is arranged at the top pipe opening of the explosion-proof pipe; the pressure relief valve includes a horizontal rotating shaft arranged at a side wall of the top pipe opening of the explosion-proof pipe, and a port sealing plate is hinged on the horizontal rotating shaft, so that the port sealing plate can press and close the top pipe opening of the explosion-proof pipe from top to bottom under the hinged action of the horizontal rotating shaft.

[0010] Preferably, the system also includes a water supply tank, the heat exchange smoke pipe extends into the water supply tank and is coated by the water in the water supply tank for heat exchange, and then extends out of the water supply tank and connects to the external atmospheric environment; the outer wall of the heat exchange water tank is shaped like a two-section stepped shaft that is thick at the top and thin at the bottom, the bottom wall of the small diameter section of the heat exchange water tank constitutes the bottom plate, and the outer diameter of the furnace chamber is smaller than the outer diameter of the small diameter section; a water inlet is arranged radially through the small diameter section, and the water inlet is connected to the water supply tank through a water supply pipeline; a heat exchange winding is arranged in the furnace chamber, and the water inlet and outlet ends of the heat exchange winding both pass through the outer wall of the furnace chamber to connect to the heat exchange water tank.

[0011] Preferably, the system also includes an air assembly for performing air supply and wind supply operations on the air inlet pipe and the air inlet pipe; the air assembly includes a main air duct whose air inlet is connected to the fan and whose air outlet is connected to the air inlet pipe, and a branch pipe is arranged at the side wall of the main air duct to form a diversion pressure relief pipe, and a sealing plate is arranged at the air outlet end of the diversion pressure relief pipe to seal the air outlet end, and a wind leakage hole connecting the diversion pressure relief pipe and the main air duct cavity is arranged through the sealing plate; the device also includes a diversion baffle whose surface is attached to the sealing plate, so that the wind flux at the wind leakage hole is adjusted by the lateral movement or rotation of the diversion baffle relative to the wind leakage hole at the sealing plate.

[0012] Preferably, the sealing plate, diverter baffle and diverter pressure relief pipe are all coaxially arranged, and the wind regulating shaft that is coaxial with the diverter baffle and drives the diverter baffle to rotate is connected to the air regulating shaft at the air path through an eccentric hinge connecting rod or chain transmission or gear transmission, thereby realizing the linkage action of the air path and the air path; the diverter pressure relief pipe includes a main diverter pressure relief pipe and an auxiliary diverter pressure relief pipe that are parallel to each other's axes, and eccentric shafts are arranged on the outer walls of the diverter baffles at the two groups of diverter pressure relief pipes, and both ends of the connecting rod extending axially along the main air duct are horizontally hinged on the eccentric shaft, thereby realizing the linkage action of the diverter baffles at the two groups of diverter pressure relief pipes; the wind regulating shaft at the main diverter pressure relief pipe The extended end of the shaft radially penetrates the main air duct, and a small connecting rod is arranged at the extended end to hinge the eccentric hinged connecting rod; the long direction of the eccentric hinged connecting rod is parallel to the radial direction of the main air duct and perpendicular to the extension direction of the extended end of the wind adjustment shaft; the extended end of the wind adjustment shaft at the auxiliary diversion pressure relief pipe also radially penetrates the main air duct; the extended ends of the two groups of wind adjustment shafts are both sleeved with compression springs, one end of the compression spring is pressed against the outer wall of the main air duct, and the other end of the compression spring extends along the extension direction of the extended end and forms a tight fit with the limit nut or limit plate fastened on the wind adjustment shaft, so that the inner end face of the diversion baffle can be pressed against the outer end face of the sealing plate through the elastic restoring force of the compression spring.

[0013] Preferably, the system also includes an air and gas assembly for performing air and gas supply operations on the air intake pipe and the air intake pipe; the air and gas assembly includes an air path module and an air path module; the air path module includes an air intake path connected to the air source, and an electromagnetic proportional valve for controlling its own air intake volume is provided at the air intake path; the air path module includes a fan, the air outlet end of the fan is connected to the air intake path, and an adjusting damper is provided on the air intake path, and the adjusting damper is driven by an air adjusting shaft to adjust the air intake volume of the air intake path, and an angle sensor for monitoring the rotation angle of the air adjusting shaft is provided next to the air adjusting shaft; the signal output end of the angle sensor is electrically connected to the signal input end of the controller, and the signal output end of the controller is electrically connected to the electromagnetic proportional valve.

[0014] Preferably, the air intake path is a parallel air path, and the electromagnetic proportional valve includes a main fire electromagnetic proportional valve and a constant fire electromagnetic proportional valve, wherein one group of parallel air paths is connected to the air inlet of the air intake pipe via the main fire electromagnetic proportional valve, and the other group of parallel air paths is connected to the bottom air inlet of the constant fire burner located next to the combustion chamber via the constant fire electromagnetic proportional valve; the air intake path includes a first parallel air path and a second parallel air path, the first parallel air path is connected to the air inlet of the burner, and the second parallel air path is connected to the air inlet of the constant fire burner; the regulating damper is arranged on the first parallel air path, so as to open and close and adjust the air intake volume of the first parallel air path; the first parallel air path is also provided with a front air door for preliminarily adjusting the air intake volume of the first parallel air path, and the front air door is arranged at a section of the air intake pipe between the regulating damper and the second parallel air path;

[0015] The gas circuit module also includes a main fire electromagnetic switch valve and a normally open fire electromagnetic switch valve; the normally open fire electromagnetic proportional valve and the main fire electromagnetic proportional valve are connected in parallel to each other to form the main gas control module, and the normally open fire electromagnetic switch valve and the main fire electromagnetic switch valve are connected in parallel to each other to form a backup gas control module; the gas outlet of the main gas circuit is divided into four groups of parallel branch gas circuits; among them, the first parallel branch gas circuit is connected to the main gas circuit at the burner via the main fire electromagnetic switch valve, and the second parallel branch gas circuit is connected to the normally open fire gas circuit at the normally open fire burner via the normally open fire electromagnetic switch valve; the third parallel branch gas circuit is connected to the normally open fire gas circuit at the normally open fire burner via the normally open fire electromagnetic proportional valve, and the fourth parallel branch gas circuit is connected to the main gas circuit at the burner via the main fire electromagnetic proportional valve; the gas circuit module also includes a control switch for realizing the connection of one of the air inlet and outlet paths between the main gas control module and the backup gas control module, and the control switch is electrically connected to the control ends of the four groups of parallel branch gas circuits through the controller.

[0016] The beneficial effects of the present invention are:

[0017] 1) Through the above scheme, the present invention not only uses a sealed furnace chamber, thereby achieving an effective confinement effect on thermal energy; it also adopts a unique vertically arranged combustion chamber, premixing tube and air inlet pipe layout, thereby forming a straight-through vertical channel. On the one hand, the straight-through structure of the vertical channel allows wind and gas to enter the furnace chamber through the vertical channel with the shortest distance and without additional obstacles, thereby greatly reducing the overall working noise and simultaneously ensuring the compactness of the volume. On the other hand, when necessary, by directly injecting cleaning liquid into the connecting pipe, the cleaning liquid can be directly discharged outside the sealed furnace chamber along the above-mentioned vertical channel, thereby realizing a convenient cleaning function for the sealed furnace chamber that cannot be cleaned normally, killing two birds with one stone.

[0018] 2) Furthermore, the present invention utilizes a double-layer mesh structure. While ensuring the direct flow of air, gas, and cleaning fluid through the mesh, it also utilizes the mesh, or even the space between the two layers of mesh, to achieve a secondary, deep mixing effect on the air-gas mixture within the premixing tube, effectively improving actual combustion efficiency. Correspondingly, the heat resistance and dense pores of the metal fiber sintered felt also effectively enhance this mixing effect. These two types of metal fiber sintered felt can be used independently or in combination.

[0019] 3) Based on the above structure, the present invention also provides a steam generation system. On the one hand, in terms of internal structure, the steam generation system achieves effective steam discharge and efficient utilization of high-heat flue gas through the design of the heat exchange water tank, heat exchange smoke pipe and steam box. On the other hand, in terms of external air supply, the present invention also provides an air assembly to achieve the precise air-fuel ratio adjustment requirements under different fire powers. Specifically:

[0020] For the mechanical air assembly: Unlike the traditional in-pipe control method that causes inaccurate control of the stove's air-fuel ratio due to the existence of nonlinear adjustment defects, the present invention creatively proposes a unique "out-pipe diversion" concept, by arranging a branch pipe next to the original main air duct, and arranging a vent with a sealing plate and a diversion baffle that can open and close the vent at the outlet end of the branch pipe. At this time, under the condition that the fan speed and air output remain unchanged, the theoretical air output Q0 = the burner's required air volume Q1 + the bypass diversion air volume Q2; in other words, when the diversion baffle is activated and a sufficiently large air outlet is exposed, the bypass diversion air volume of the branch pipe increases, and the air volume required by the burner connected to the main air duct outlet will decrease accordingly, thereby cleverly realizing the convenient online adjustment function of the stove's air-fuel ratio while maintaining the fan's current speed. It's important to note that since the diverter baffle and sealing plate are independent of the main air duct, they don't occupy the main air duct installation space and can even be installed directly on the original stove, reducing stove replacement costs. This also eliminates the need for frequent fan speed adjustments, significantly extending the lifespan. Furthermore, the diverter baffle operates in a contact-type manner relative to the sealing plate, and the opening and closing of the vent holes are linearly adjusted, making it easier to precisely adjust the stove's air-fuel ratio for different firepower levels.

[0021] For the air and gas assembly controlled by the sensor method: the present invention abandons the many defects brought about by the traditional independent control of air and gas or the air-controlled air method; by breaking through the shackles of thinking, it adopts a unique design concept of controlling air with air, which effectively lowers the actual operation threshold of the present invention and has the advantage of high ignition reliability. In the actual design, the present invention utilizes a controllable fire valve structure, controls the air path, and adjusts the opening and closing amplitude of the damper through the angle sensor, and then transmits the signal to the controller such as PLC, and then the controller performs follow-up linkage control on the main fire electromagnetic proportional valve and the normally bright fire electromagnetic proportional valve, and finally realizes the air and gas linkage function. In addition, on the one hand, by controlling the air path switching function of the switch, the entire device first meets the inherent function of the flameout protection valve, that is: if the main gas control module fails and the gas path cannot be unblocked, the various electronic modules controlling the main gas control module will automatically shut down. At this time, the main gas control module is shut down to achieve flameout protection. On the other hand, when the main gas control module is in flameout mode, the kitchen is still experiencing peak usage, or at least in active use. Maintenance personnel are unlikely to be able to immediately enter the busy kitchen for on-site repairs. Therefore, simply flipping a control switch connects the air inlet to the backup gas control module. This allows the stove to be powered on through the backup gas control module even in the flameout mode, thus staggering maintenance times. When the kitchen is idle, maintenance can be performed, ensuring safety and ensuring real economic benefits for users. It's worth noting that during this usage, the air-gas linkage only controls the precise linkage of the main gas control module, while the backup gas control module only needs to be controlled to open and close. In other words, the present invention utilizes the precise controlled linkage function of the solenoid proportional valve to extremely accurately control the fine-grained proportions of gas output in the main gas circuit, perfectly achieving the ultimate "gas follows the wind" effect. The constant-fire electromagnetic on-off valve and the main-fire electromagnetic on-off valve are only responsible for opening and closing, not for precise adjustment, in order to ensure the simplicity of the overall structure, reliable operation and low cost of the structure. Under normal use, the main gas control module should include a constant-fire electromagnetic proportional valve and a main-fire electromagnetic proportional valve; in this way, through the controller or single-chip microcomputer, the opening and closing states of the constant-fire electromagnetic proportional valve and the main-fire electromagnetic proportional valve can be accurately controlled, thereby realizing the timely adjustment function of the air intake volume at the main gas path and the constant-fire gas path. Even when necessary, the "wind-controlled gas" method can be used to utilize the precise movement characteristics of the electromagnetic proportional valve that are different from other valve bodies, thereby realizing the function of nonlinearly controlling the air intake volume by the air intake volume, so as to ensure that the flame is always in the best combustion state when the stove is in use.As for the backup gas control module, it serves an occasional backup control function after all, so there is no need to design sophisticated components. It only needs to be able to realize the on-off function of the backup gas circuit by controlling the switch to ensure the cost-effectiveness of the overall design. At the same time, the simple mechanical structure also brings extremely high reliability, thereby meeting the function of reliable opening and closing at any time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of the burner;

[0023] Figure 2 This is the coordination diagram of the burner and the heat exchange water tank;

[0024] Figure 3 This is a diagram of the coordination of the burner, heat exchange water tank, steam tank and water supply tank;

[0025] Figure 4 This is a structural diagram of the water supply tank;

[0026] Figure 5 A schematic diagram of the structure of one of the wind assemblies;

[0027] Figure 6 for Figure 5 The schematic diagram of the linkage of the two sets of diversion and pressure relief pipes at the air assembly shown;

[0028] Figure 7 for Figure 5 The assembly state diagram of the wind and air assembly shown;

[0029] Figure 8 and Figure 9 It is a diagram of the usage status of another wind assembly;

[0030] Figure 10 for Figure 8 The electrical wiring diagram of the wind and air assembly shown;

[0031] Figure 11 and Figure 12 General assembly drawing of the main gas control module and the standby gas control module;

[0032] Figure 13 for Figure 11 a side view of the structure shown;

[0033] Figure 14 and Figure 15 This is a three-dimensional diagram of the layout of the front air door and the regulating air door;

[0034] Figure 16 A cross-sectional view of the damper adjustment.

[0035] The actual correspondence between the reference numerals and component names of the present invention is as follows:

[0036] A-gas path B-air path

[0037] a-burner a1-premixing pipe a2-air inlet pipe a3-inlet pipe a4-furnace chamber

[0038] a5-Inner mesh covera6-Outer mesh covera7-Heat exchange water tanka8-Heat exchange smoke pipea9-Steam box

[0039] a10-steam filter cover a11-water vapor separation baffle

[0040] a12-explosion-proof pipe a13-pressure relief valve

[0041] a14-water supply tank a15-water supply pipeline b-constant flame burner c-controller

[0042] 10-gas circuit module 11-air inlet 12-constant fire gas circuit 13-main gas circuit

[0043] 14a- Constant fire electromagnetic proportional valve 14b- Main fire electromagnetic proportional valve

[0044] 15a- Constant fire electromagnetic switch valve 15b- Main fire electromagnetic switch valve

[0045] 16a-first parallel branch gas path 16b-second parallel branch gas path

[0046] 16c-third parallel branch gas path 16d-fourth parallel branch gas path

[0047] 17-Control switch 18-One-way ball valve

[0048] 19a- Main fire regulating valve 19b- Constant fire regulating valve

[0049] 19c-Gas pressure regulating valve 19d-Throttle valve

[0050] 20-air duct module 21-fan 22a-first parallel air duct 22b-second parallel air duct

[0051] 23-Adjusting air door 24-Angle sensor 25-Front air door

[0052] 25a-Observation plate 25b-Waist-shaped adjustment hole 25c-Anchor column

[0053] 30- Main air duct 30a- Main shunt pressure relief pipe 30b- Secondary shunt pressure relief pipe

[0054] 31-sealing plate 31a-air leakage hole 32-diversion baffle 33-fixed air door

[0055] 34-wind regulating shaft 34a-eccentric shaft 34b-radial rod 35-eccentric hinge connecting rod

[0056] 36-Connecting rod 37-Dial

[0057] 41-air adjustment shaft 42-adjustment handle DETAILED DESCRIPTION

[0058] For ease of understanding, here we combine Figure 1-16 The specific structure and working mode of the present invention are further described as follows:

[0059] The specific structure of the present invention is as follows Figure 1-16 As shown, its main structure includes a steam generator with a burner a and an air and gas assembly for supplying gas and air to the steam generator, wherein:

[0060] The steam generator of the present invention has a cylindrical structure, and the fuel is liquefied petroleum gas, natural gas, biogas or blast furnace gas. In actual design, a gas pressure stabilizing valve 19c needs to be arranged to ensure that the gas input pressure of the equipment does not exceed the upper limit of the gas pressure; the corresponding gas pressure switch is installed at the outlet of the gas pressure stabilizing valve to ensure that the gas pressure is within a certain pressure range. If it exceeds this range, the gas pressure switch will close the gas channel. The fuel is sequentially input into the air inlet pipe a3 and the premixing pipe a1 through the gas pressure stabilizing valve and the gas pressure switch, and is fully premixed with the air transported by the air inlet pipe a2 in the premixing pipe a1 and then input into the combustion chamber. Figure 1 As shown, the combustion chamber is cylindrical, and its structure is a double-cylinder nested structure formed by the cooperation of the inner mesh cover a5 and the outer mesh cover a6. The inner mesh cover a5 and the outer mesh cover a6 are both honeycomb structures with open holes on the surface, and are covered with a special high-temperature resistant metal fiber sintered felt. The premixed gas in the premixing pipe a1 is transported to the combustion chamber for further mixing. At the same time, the metal fiber sintered felt can also promote the deep mixing of gas and air. The outside of the combustion chamber is a cylindrical furnace, also known as the furnace chamber. Figure 2-3 As shown, a constantly open flame burner b is provided beside the combustion chamber, and the constantly open flame burner b is composed of a high-pressure ignition needle, a return needle, a flame detection needle and a constantly open flame nozzle.

[0061] like Figure 3As shown, the entire furnace chamber a4 is divided into two directly connected upper and lower sections. The flames from the combustion chamber directly heat the lower section. The entire furnace chamber a4 is immersed in water, and its outer walls can be equipped with metal heat exchange fins to improve heat exchange efficiency. Hot flue gases and residual flames ascend into the upper furnace chamber, heating the upper furnace wall and the internal heat exchange winding, which is wound with thin-walled metal tubes and flows through water. The central axis of the heat exchange winding is vertical, and its upper and lower ports are connected to the water outside the furnace chamber a4. The hot flue gases, further cooled, enter the heat exchange flue pipe a8 outside the furnace chamber a4. The heat exchange pipe a8 consists of a lower boss flue gas cavity, a metal coil, and a smoke collecting box. The lower boss flue gas cavity is a protruding cavity extending outward from the lower part of the upper furnace and communicating with it. The metal coil is a spiral metal tube winding wound with thin-walled hollow metal tubes. The smoke collecting box is located above the upper furnace and is a flat cavity structure. The low-level smoke inlets and high-level smoke outlets of the multiple metal coils are installed in the lower boss smoke chamber and the side walls of the smoke collection box, following the direction of the winding metal tubes from the inside out. Hot smoke enters the heat exchange smoke pipe a8 from the furnace chamber a4, where it further exchanges heat with the water outside. After flowing out of the smoke collection box outlet, the smoke passes through the metal coils, through the upper side wall of the heat exchange water tank a7, and into the make-up water tank a14 installed outside the heat exchange water tank a7. The heat exchange water tank a7 is a container that houses the furnace chamber a4 and the heat exchange smoke pipe a8 and is filled with water. The make-up water tank a14 includes a metal float and valve assembly to control the water level and water inlet, which are used to control the final water level of the equipment. After the end of the heat exchange smoke pipe a8 enters the make-up water tank a14, it further exchanges heat with the low-temperature tap water in the make-up water tank a14 before being discharged into the external atmosphere.

[0062] The water inlet of the water supply tank a14 is connected to municipal tap water, and the water outlet is connected to the lower part of the heat exchange water tank a7 through the water supply pipe a15. The water level in the heat exchange water tank a7 is slightly higher than the upper surface of the cigarette box. When the equipment is in operation, the steam-water mixture gushes upward from the upper area of the furnace chamber a4, namely the upper furnace, and from the annular gap between the heat exchange water tank a7 and the heat exchange flue, into the steam filter cover a10. The steam filter cover a10 is a circular ring or barrel-shaped enclosure installed in the middle area below the top plate of the heat exchange water tank a7. The steam filter cover a10 is located directly above the upper furnace, has a smaller diameter than the upper furnace, and is surrounded by multiple steam holes for steam permeability. After the steam-water mixture with a certain amount of kinetic energy gushes upward along the annular gap to the top plate of the heat exchange water tank a7, the hot water will rebound and splash, and then fall after being blocked by the steam filter cover a10. The separated steam passes through the steam holes and enters the primary steam outlet. In actual design, a primary return pipe connecting the lower level of the heat exchange water tank a7 and slightly above the upper level of the water supply cutoff of the steam tank a9 can be arranged. This allows the large amount of hot water separated from the steam filter a10 to flow from the upper level of the heat exchange water tank a7 through the primary return pipe, from outside the heat exchange water tank a7 back to the lower part of the heat exchange water tank a7, thereby preventing a large amount of hot water from entering the steam tank a9 through the primary steam outlet. The steam tank a9 is located above the heat exchange water tank a7, with the intermediate partition forming the top plate of the heat exchange water tank a7. The primary steam outlet is located in the middle of the steam filter a10 and extends through the top plate of the heat exchange water tank a7.

[0063] A water vapor separation baffle a11 is installed above the primary steam outlet. Located within the steam box a9, this baffle is in an inverted L-shape, with its upper transverse section located directly above the primary steam outlet and projected larger than the primary outlet. When the steam-water mixture strikes the baffle, the water's kinetic energy is dissipated, causing it to rebound and fall, converging into a secondary return pipe installed in the steam box a9, away from the secondary steam outlet. This secondary return pipe connects the heat exchanger tank a7 to the bottom of the steam box a9. The top of the steam box a9 houses the secondary steam outlet and a safety and instrumentation pipe. The pressure relief valve a13, thermometer, and pressure gauge are connected to the safety and instrumentation pipe. A slightly downward-angled, inward-facing, one-way valve is installed on the sidewall of the steam box a9. This valve balances atmospheric pressure when the steam generator discharges water. The top of the makeup water tank a14 is connected to the heat exchanger tank a7 and steam box a9 via a metal pipe, providing pressure balancing. The present invention may also be equipped with a drain port, through which wastewater is discharged after the scale is removed using a descaling agent. The equipment is equipped with a fire observation hole made of high-temperature resistant glass and heat-resistant stainless steel pipe. The pipe of the fire observation hole passes through the outer shell of the heat exchange water tank A7 and the lower furnace wall in sequence, and is close to the ignition needle, which is used to observe the combustion of the constant flame and the main flame.

[0064] For the safety of the equipment and operators, this equipment is equipped with a variety of safety protection designs: when the steam exceeds a certain pressure (such as 80kPa), the equipment will Figure 2 Pressure relief valve a13, located on explosion-proof pipe a12, relieves pressure. When the water level in the heat exchange water tank a7 drops below the furnace ceiling, the dry-burn prevention device, installed on the lower sidewall of the heat exchange water tank a7 via a water-level connecting pipe, cuts off power to the gas proportional valve, shutting off the gas supply. An audible alarm sounds through the ignition controller. To prevent electric shock, power is supplied to the circuit board via an isolation transformer, with a leakage protection switch installed at the front of the transformer.

[0065] Clearly, through ingenious scientific design, the present invention achieves a compact structure, small size, low noise, high combustion efficiency, easy manufacturing, and versatile applications. For example: ① As a steam generator, since the water volume within the entire chamber is controlled within 30L, the present device does not constitute a pressure vessel and need not be regulated as a boiler-type pressure vessel. It complies with the national standard for steam generators in GB 35848-2018. ② It can be easily combined with the steaming chamber of a rice steamer or steaming cabinet, creating a high-efficiency, low-noise gas-fired rice steamer or steaming cabinet. In actual use, the present invention achieves extremely high combustion thermal efficiency and ultra-low waste heat emissions. The combustion thermal efficiency reaches 95% (under high calorific value conditions), and under normal circumstances, the exhaust temperature of the smoke is only around 60°C. Compared with traditional equipment, the present invention not only offers significant energy savings but also considerable cost advantages, resulting in a highly effective solution.

[0066] Furthermore, as one embodiment of the present invention, the mechanical wind assembly has a specific structure as shown in FIG. Figure 5-6 As shown, during assembly, the present invention achieves accurate control of the air-fuel ratio by bypassing and shunting the air volume of the fan to relieve pressure. The principle is that when the fan speed and air volume remain unchanged, the theoretical air volume Q0 = the air volume required by the burner Q1 + the bypass air volume Q2. During operation: the fan is located at the front end of the present invention so as to be connected to the air inlet, while the burner is located at the rear end of the present invention and connected to the air outlet. The gas regulating shaft 41 at the gas valve of the burner and the air regulating shaft 34 at the main air duct 30a are synchronously driven by coaxial or sprocket connection or eccentric hinged connecting rod 35. The hinged connection method of the eccentric hinged connecting rod 35 and the small connecting rod is the same as the working method of the radial rod 34b and the eccentric shaft 34aa.

[0067] Figure 7 In the diagram, the gas path is A and the wind path is B to distinguish them.

[0068] In actual operation, the fixed ends of the main air duct 30a and the auxiliary diversion pressure relief pipe 30b of the present invention are fixed on the main air duct 30 at the air path B and connected to the main air duct 30 cavity. After the cantilever ends of the two groups of diversion pressure relief pipes are sealed by the sealing plate 31, they are coaxially rotated on the sealing plate 31 to cooperate with the diversion baffle 32. The diversion baffle 32 is then supported by the following structure: Figure 5 The wind regulating shaft 34 shown realizes the rotation regulating function, thereby realizing the purpose of fully or partially shielding the air leakage hole 31a based on the sealing plate 31. The two sets of diversion baffles 32 at the main air duct 30a and the auxiliary diversion pressure relief pipe 30b are connected by a connecting rod 36 or a meshing gear. Figure 6 As shown. As for the diverter baffle 32, it is a baffle structure with a fan-shaped plane vertically mounted on the wind adjustment shaft 34. It is generally recommended that its area is not less than half of the area of the entire sealing plate 31; during the rotation of the wind adjustment shaft 34, the wind adjustment shaft 34 will drive the diverter baffle 32 to rotate around the axis on the outer end face of the sealing plate 31. When the area of the air leakage hole 31a blocked by it is small, the bypass air volume Q2 increases and the air volume Q1 required by the burner decreases; conversely, Q2 decreases and Q1 increases. During the rotation of the gas adjustment shaft 41 controlled by the adjustment handle 42 at the gas path A, the ratio of the gas flow rate and the rotation angle of the gas adjustment shaft 41 changes. Therefore, in actual applications, in order to achieve the optimal air-fuel ratio for the corresponding fire position, the ratio of the air supply volume and the rotation angle of the gas adjustment shaft 41 and even the wind adjustment shaft 34 also changes in a related manner.

[0069] Of course, in actual operation, even if the air-fuel ratio is appropriate, when the burner's gas and air supply volumes are both low, flashback is very likely. The maximum value of the gas input power range prone to flashback is defined herein as the "flashback upper limit power," and the corresponding gas valve opening and closing degree of the adjustment handle 42 is the "flashback angle." Burners with different structural designs have different flashback characteristics. To this end, the present invention also utilizes the adjustment handle 42, its synchronously rotating dial 37, a position switch, and its auxiliary design, so that when the rotation angle of the adjustment handle 42 exceeds the flashback angle, the dial 37 triggers the position switch, which then connects the power supply to the main gas solenoid valve connected to the main gas pipeline, thereby turning on the main flame.

[0070] As another type of sensor-type wind assembly, its specific implementation structure can refer to Figure 8-16 As shown, its main structure comprises two major components: a gas circuit module 10 and an air circuit module 20. The gas circuit module 10 includes an air inlet 11 connected to the gas source, a main gas control module, a backup gas control module, a control switch 17, a one-way ball valve 18, a main flame regulating valve 19a, a constant flame regulating valve 19b, a gas pressure stabilizing valve 19c, and a throttle valve 19d. The air circuit module 20 primarily comprises, from front to back, an air pressure sampling tube, a constant flame air intake (i.e., the air inlet of the second parallel air circuit 22b), a front damper 25, and a regulating damper 23.

[0071] For the air duct module 20, the front air door 25 is used for pre-adjustment and rough adjustment, while the regulating air door 23 is used to directly realize precise air-air linkage adjustment online. The two have their own responsibilities along the layout direction of the first parallel air duct 22a. Figure 8-9 As shown, the waist-shaped adjustment hole 25b on the observation plate 25a cooperates with the anchor post 25c to visually control the opening and closing range of the front damper 25. A constant-fire air intake, also known as the inlet of the second parallel air path 22b, is located on the air inlet side of the front damper 25, ensuring that the damper's operation does not interfere with the normal operation of the constant-fire burner. A wind pressure sampling tube is placed before the constant-fire air intake to monitor the air output of the fan 21 in a timely manner.

[0072] As for the regulating damper 23, it is one of the core design points of the present invention. The regulating damper 23 includes a damper plate, which is driven by the wind regulating shaft to generate a rotational motion. One end of the wind regulating shaft passes through and extends out of one side wall of the first parallel air path 22a to form a driving end; the other end of the wind regulating shaft extends in the opposite direction out of the other side wall of the first parallel air path 22a, and then connects to the signal input shaft of the angle sensor 24 through a coupling. In this way, whenever the wind regulating shaft rotates, the wind regulating shaft can drive the damper plate to generate a controllable regulating function for the air intake volume of the first parallel air path 22a. Once the wind regulating shaft rotates, the angle sensor 24 captures the rotation angle of the wind regulating shaft, and then transmits the signal to the sensor such as Figure 10 The controller c shown can control the main fire electromagnetic proportional valve 14b and the normally bright fire electromagnetic proportional valve 14a to produce corresponding actions, ultimately achieving a precise control effect.

[0073] In actual use, since the fan 21 is usually installed at a lower position, operating the driving end at the same height as the fan 21 to achieve wind-air linkage is obviously not friendly to people with damaged waists or elderly chefs. Therefore, it is possible to consider Figure 8-9 The chain drive structure shown in the figure links the gear at the drive end to the driving pulley at a higher position on the stove via a chain drive, thereby enabling quick and convenient operation of the damper 23 and the entire air-conditioning system without bending over. Furthermore, the angle sensor 24 should be covered with a protective housing to minimize or even eliminate the impact of the complex working environment of the kitchen on the relatively fragile angle sensor 24.

[0074] Further, by Figure 10It is clear that the main gas control module and the backup gas control module are parallel electrical circuits. Specifically, the first parallel branch gas line 16a connects to the main gas line 13 at burner a via the main fire electromagnetic on / off valve 15b. The second parallel branch gas line 16b connects to the normally open fire gas line 12 at burner b via the normally open fire electromagnetic on / off valve 15a. The third parallel branch gas line 16c connects to the normally open fire gas line 12 at burner b via the normally open fire electromagnetic proportional valve 14a. The fourth parallel branch gas line 16d connects to the main gas line 13 at burner a via the main fire electromagnetic proportional valve 14b.

[0075] In actual use, since the main gas control module and the backup gas control module both adopt an electrically controllable solenoid valve structure, they can be controlled by the ignition controller, that is, the controller C. The working states form a logical OR relationship with each other, and are controlled by the following logic: Figure 10 The three-position power switch, also known as control switch 17, switches between operating modes. Control switch 17 has three operating states: stop mode, operating mode, and standby mode. In operating mode, the main gas control module is connected to the electrical circuit and is in operation, while the standby gas control module is disconnected and in a stop state. In standby mode, the main gas control module is disconnected from the electrical circuit and is in a stop state, while the standby gas control module is connected and in an operating state. In stop mode, both the standby and main gas control modules are in a stop state, and the system does not operate. The standby gas control module only provides gas on / off functionality, with on / off times typically measured in milliseconds. The main gas control module's main fire solenoid proportional valve precisely controls the main gas flow and the required time. The standby gas control module serves as a backup control in this system. In standby mode, the main fire and main fire functions remain operational, significantly enhancing the product's practicality and meeting the demands of demanding workplaces where troubleshooting time for the stove's gas control is short.

[0076] For the one-way ball valve 18, Figure 10-13The device is shown vertically mounted on the outlet side of the main gas control module. This vertical mounting allows the ball inside one-way ball valve 18 to be pressed downward by its own weight against the inlet port of one-way ball valve 18. One-way ball valve 18 is open in the direction of the gas flow path and closed in the opposite direction. When main fire solenoid proportional valve 14b or main fire solenoid on-off valve 15b is momentarily opened, allowing gas to flow directly to burner a. Or, when a long-handled gas ball valve is present in main gas line 13, main fire solenoid proportional valve 14b or main fire solenoid on-off valve 15b is prematurely opened, allowing gas to flow directly to burner a. If the long-handled gas ball valve in main gas line 13 is then momentarily opened to connect burner a, the vertical mounting of one-way ball valve 18 slows the opening speed and angle of the valve core under its own weight as gas passes through it. This prevents a sudden pressure drop in the main gas line 13, shared by the constant-fire and main fire, and ensures inlet pressure. Of course, the one-way ball valve 18 can also be replaced with a one-way damping valve. Because the elastic parts such as the compression spring in the one-way damping valve can ensure the delay function of the instantaneous impact of the gas, there is no need to adjust its plumb state at this time, so there is no need to limit it to a vertical installation state.

[0077] In actual use, as a further preferred solution, various sensors can be installed on each manual air intake adjustment part of burner a and constant-open flame burner b, and equipped with a controller c and a control program. For the main fire, the above-mentioned sensors can sensitively sense the chef's operation of the main fire, and combined with the set program, the opening and closing speed of the main gas can be delayed through the controller c program, thereby avoiding the functional defect of the constant-open flame that is easy to extinguish due to the instantaneous opening and closing of the main fire from the perspective of electrical control, and jointly protecting the constant-open flame from the influence of the opening and closing of the main gas with the mechanical damping effect of the one-way ball valve 18. For the constant-open flame, the sensor can sensitively judge whether the gas supply of the constant-open flame is appropriate based on the strength of the constant-open flame ion probe signal, and make corresponding signal reminders, and judge the service life and adverse trends of the ion probe based on the strength of the best measurable electrical signal, reminding the user to repair and replace the ion probe in time and eliminate potential faults, thereby ensuring the long-term stable operation of the machine. Burner a can even be equipped with a flame ionization probe, along with a controller c and an ionization probe sampling, judgment, and control program. This can sensitively determine whether the main fire gas supply is appropriate based on the strength of the main fire ionization probe signal, and issue a corresponding signal reminder, prompting the user to appropriately adjust the main gas valve opening and closing, taking into account the actual main fire flame combustion conditions, to achieve the optimal main fire combustion state. At the same time, a flame ionization probe can also be placed on a constantly burning burner b. This purpose also serves the same purpose, in conjunction with controller c and the ionization probe sampling, judgment, and control program. This allows for sensitive determination of the main fire gas supply based on the strength of the main fire ionization probe signal, and, based on the program instructions of controller c, adjusts the opening and closing of the corresponding main gas control module at a specific main fire power, thereby achieving automatic closing and precise negative feedback control of the main fire.

[0078] In actual work, due to Figure 8-9 The damper handle, which controls the rotation of the air adjustment shaft, corresponds to different air volume supply positions. Therefore, no matter where the damper handle is located within the corresponding power range, the voltage output at controller C can be used to adjust the excitation voltage of the corresponding solenoid proportional valve, ultimately achieving the optimal air-fuel ratio matching value. Therefore, it is necessary to obtain a mapping relationship between the angle value of the damper handle at that position and the excitation voltage value of the corresponding solenoid proportional valve. Here, an "angle-voltage" mapping curve can be obtained through experimental plotting. The microcontroller records this curve and executes it in the application to achieve precise open-loop control of the air-fuel ratio. Once the stove is designed, the overall gas resistance and conduction capacity of its pipelines, as well as the air resistance and conduction capacity of the air passages, are fixed. Therefore, as long as the gas pressure regulating valve maintains a constant pressure on the gas input to the stove, the air-fuel ratio curve corresponding to any calorific value of gas can be determined using the "angle-voltage" mapping curve. The specific operating logic is as follows: ① The stove is powered on, the fan starts, and the furnace is pre-purged. ② The ignition controller ignites normally, and the high level at angle sensor 24 is transmitted to controller C, while the system enters standby mode. ③ When the damper handle is moved to a certain position, angle sensor 24 transmits the angle value to the microcontroller (MCU) serving as controller C. Based on a pre-stored "angle-voltage" corresponding curve / value mapping table, the MCU outputs the corresponding excitation voltage to the corresponding solenoid proportional valve, causing it to maintain the corresponding gas valve opening or closing degree according to this excitation voltage. This allows for precise regulation of the stove's air-fuel ratio across the full power range.

[0079] Of course, it will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0080] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0081] The technology, shape, and structure not described in detail in the present invention are all well-known technologies.

Claims

1. A steam generation system using a burner, characterized in that: The burner comprises a combustion chamber, a premixing tube (a1) and an air inlet tube (a2) arranged in sequence from top to bottom along a vertical direction, the air inlet tube (a2) being an L-shaped tube, and the air inlet tube (a3) penetrating the bottom end surface of the air inlet tube (a2) from bottom to top and extending into the tube cavity of the straight tube section of the air inlet tube (a2); the furnace cavity of the combustion chamber, the tube cavity of the premixing tube (a1) and the tube cavity of the straight tube section of the air inlet tube (a2) cooperate to form a straight vertical channel; the combustion chamber is covered with a furnace chamber (a4) for forming a furnace, and a connecting pipe is provided on the chamber wall of the furnace chamber (a4) so as to be connected to the external environment; The furnace chamber (a4) is located in the cavity of the heat exchange water tank (a7) and is thus covered by water. The bottom wall of the heat exchange water tank (a7) constitutes a bottom plate. A heat exchange smoke pipe (a8) having a heat exchange function is arranged in the heat exchange water tank (a7). The inlet of the heat exchange smoke pipe (a8) is connected to the furnace chamber (a4). The outlet of the heat exchange smoke pipe (a8) is connected to the external atmospheric environment. A first-level steam outlet is provided on the cavity of the heat exchange water tank (a7). A steam box (a9) is arranged above the heat exchange water tank (a7). The steam box (a9) and the heat exchange water tank (a7) share a top plate. A connecting hole is provided through the top plate to form the first-level steam outlet. outlet; the system also includes a steam filter cover (a10) in the shape of a barrel with an opening facing upward, a steam hole is opened on the barrel wall of the steam filter cover (a10), and the steam filter cover (a10) is buckled from bottom to top on the connecting hole to connect the two; a secondary steam outlet is arranged at the steam box (a9) to connect to an external steam device; a water vapor separation baffle (a11) is provided at the top hole end of the connecting hole; the water vapor separation baffle (a11) first extends upward and then extends horizontally to the top of the connecting hole; the secondary steam outlet is opened on the top wall of the steam box (a9) above or behind the water vapor separation baffle (a11); The connecting pipe vertically penetrates the top wall of the furnace chamber (a4), and the connecting pipe constitutes an explosion-proof pipe (a12) for preventing the pressure in the furnace chamber (a4) from exceeding the limit; a pressure relief valve (a13) is arranged at the top pipe opening of the explosion-proof pipe (a12); the pressure relief valve (a13) includes a horizontal rotating shaft arranged at a side wall of the top pipe opening of the explosion-proof pipe (a12), and a port sealing plate is hinged on the horizontal rotating shaft, so that the port sealing plate can press and seal the top pipe opening of the explosion-proof pipe (a12) from top to bottom under the hinged action of the horizontal rotating shaft; The system also includes a water supply tank (a14), a heat exchange smoke pipe (a8) extending into the water supply tank (a14) and being coated by the water in the water supply tank (a14) for heat exchange, and then extending out of the water supply tank (a14) and connected to the external atmospheric environment; the outer wall of the heat exchange water tank (a7) is in the shape of a two-stage stepped shaft with a thick upper part and a thin lower part, the bottom wall of the small shaft diameter section of the heat exchange water tank (a7) constitutes the bottom plate, and the outer diameter of the furnace chamber (a4) is smaller than the outer diameter of the small shaft diameter section; a water inlet is arranged radially through the small shaft diameter section, and the water inlet is connected to the water supply tank through a water supply pipeline (a15); a heat exchange winding is arranged in the furnace chamber (a4), and the water inlet end and the water outlet end of the heat exchange winding both penetrate the outer wall of the furnace chamber to be connected to the heat exchange water tank (a7).

2. The steam generating system according to claim 1, characterized in that: The combustion chamber comprises an inner mesh cover (a5) and an outer mesh cover (a6) which are coaxially arranged with each other. The inner mesh cover (a5) and the outer mesh cover (a6) are both barrel-shaped mesh covers with the barrel opening facing downwards, and the cover openings of the two mesh covers are fixed on the bottom plate. The top pipe opening of the premixing pipe (a1) passes through the bottom plate and is connected to the cover cavity of the inner mesh cover (a5).

3. The steam generating system according to claim 2, characterized in that: The inner mesh cover (a5) and the outer mesh cover (a6) are both covered with a layer of metal fiber sintered felt.

4. The steam generating system according to claim 1, wherein: The system also includes an air and gas assembly for performing air and gas supply operations on the air inlet pipe (a3) and the air inlet pipe (a2); the air and gas assembly includes a main air duct (30) whose air inlet is connected to the fan (21) and whose air outlet is connected to the air inlet pipe (a2); a branch pipe is arranged at the side wall of the main air duct (30) to form a diversion pressure relief pipe; a sealing plate (31) is arranged at the air outlet end of the diversion pressure relief pipe for sealing the air outlet end; an air leakage hole (31a) is arranged through the sealing plate (31) to connect the diversion pressure relief pipe and the main air duct (30) cavity; and the system also includes a diversion baffle (32) attached to the sealing plate (31), so that the air flow at the leakage hole (31a) is adjusted by the lateral movement or rotation of the diversion baffle (32) relative to the leakage hole (31a) at the sealing plate (31).

5. The steam generating system according to claim 4, characterized in that: The sealing plate (31), the diversion baffle (32) and the diversion pressure relief pipe are all coaxially arranged. The wind regulating shaft (34) coaxial with the diversion baffle (32) and driving the diversion baffle (32) to generate a rotational movement is connected to the air regulating shaft (41) at the air path through an eccentric hinged connecting rod (35) or a chain drive or a gear drive, thereby realizing the linkage movement of the air path and the air path; the diversion pressure relief pipe includes a main diversion pressure relief pipe (30a) and a secondary diversion pressure relief pipe (30b) whose axes are parallel to each other. The eccentric shaft (34a) is arranged on the outer wall of the diversion baffle (32) at the two groups of diversion pressure relief pipes, and both ends of the connecting rod (36) extending axially along the main air duct (30) are horizontally hinged on the eccentric shaft (34a), thereby realizing the linkage movement of the diversion baffle (32) at the two groups of diversion pressure relief pipes.

6. The steam generating system according to claim 1, characterized in that: The system further comprises an air and gas assembly for performing air and gas supply operations on the air inlet pipe (a3) and the air inlet pipe (a2); the air and gas assembly comprises an air path module (10) and an air path module (20); the air path module (10) comprises an air inlet path (11) connected to an air source, and an electromagnetic proportional valve for controlling its own air intake is provided at the air inlet path (11); the air path module (20) comprises a fan (21), an air outlet end of the fan (21) is connected to the air inlet path, an adjusting damper (23) is provided on the air inlet path, the adjusting damper (23) is driven by an air regulating shaft (34) to adjust the air intake of the air inlet path, and an angle sensor (24) for monitoring the rotation angle of the air regulating shaft (34) is provided beside the air regulating shaft (34); a signal output end of the angle sensor (24) is electrically connected to a signal input end of a controller, and a signal output end of the controller is electrically connected to the electromagnetic proportional valve.

7. The steam generating system according to claim 6, characterized in that: The air inlet path (11) is a parallel air path, and the electromagnetic proportional valve includes a main fire electromagnetic proportional valve (14b) and a constant fire electromagnetic proportional valve (14a), wherein one group of parallel air paths is connected to the air inlet of the air inlet pipe via the main fire electromagnetic proportional valve (14b), and the other group of parallel air paths is connected to the bottom air inlet of the constant fire burner located next to the combustion chamber via the constant fire electromagnetic proportional valve (14a); the air inlet path includes a first parallel air path (22a) and a second parallel air path (22b), and the first parallel air path (22a) is connected to the burner. At the air inlet, the second parallel air path (22b) is connected to the air inlet of the constantly open flame burner; the regulating damper (23) is arranged on the first parallel air path (22a), so as to be used for opening and closing and adjusting the air intake of the first parallel air path (22a); the first parallel air path (22a) is also provided with a front damper (25) for preliminarily adjusting the air intake of the first parallel air path (22a), and the front damper (25) is arranged at a section of the air inlet pipe (a2) between the regulating damper (23) and the second parallel air path (22b); The gas circuit module (10) further comprises a main fire electromagnetic switch valve (15b) and a constant fire electromagnetic switch valve (15a); the constant fire electromagnetic proportional valve (14a) and the main fire electromagnetic proportional valve (14b) are connected in parallel to form a main gas control module, and the constant fire electromagnetic switch valve (15a) and the main fire electromagnetic switch valve (15b) are connected in parallel to form a standby gas control module; the gas outlet of the main gas circuit (13) is divided into four groups of parallel branch gas circuits; wherein, the first parallel branch gas circuit (16a) is connected to the main gas circuit (13) at the burner via the main fire electromagnetic switch valve (15b), and the second parallel branch gas circuit (16b) is connected to the main gas circuit (13) at the burner via the constant fire electromagnetic switch valve (15b). The magnetic switch valve (15a) is connected to the normally open flame gas path (12) at the normally open flame burner; the third parallel branch gas path (16c) is connected to the normally open flame gas path (12) at the normally open flame burner via the normally open flame electromagnetic proportional valve (14a); the fourth parallel branch gas path (16d) is connected to the main gas path (13) at the burner via the main fire electromagnetic proportional valve (14b); the gas path module (10) further includes a control switch (17) for realizing the conduction of the gas outlet path of the gas inlet path (11) between the main gas control module and the standby gas control module, and the control switch (17) is electrically connected to the control ends of the four groups of parallel branch gas paths through the controller.

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