Gas furnace flue gas latent heat extraction and recovery device

Abstract

The invention relates to the technical field of smoke latent heat extraction and recovery, in particular to a gas furnace smoke latent heat extraction and recovery device which comprises a shell, a gas inlet header pipe, a gas outlet header pipe and a plurality of heat exchange mechanisms. The heat exchange mechanism comprises a telescopic combustion assembly and a plurality of heat exchangers. The telescopic combustion assembly comprises a telescopic combustion chamber, an air inlet branch pipe, an air outlet branch pipe, an air inlet branch pipe control valve, an air outlet branch pipe control valve and an igniter. A combustion cavity is formed in the telescopic combustion chamber, the igniter is arranged in the combustion cavity, and the heat exchanger is arranged outside the combustion chamber and used for exchanging heat with smoke in the combustion cavity. One end of the air inlet branch pipe communicates with the air inlet main pipe, and the other end communicates with the combustion cavity. By means of the telescopic function of the telescopic combustion chamber, after smoke enters the telescopic combustion chamber, the size of the telescopic combustion chamber is increased, the igniter is controlled to work, carbon monoxide is ignited, air pollution is reduced, and meanwhile latent heat is conveniently extracted and recycled.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of latent heat extraction and recovery of flue gas, and in particular to a latent heat extraction and recovery device for flue gas of a gas stove. BACKGROUND

[0002] The latent heat of flue gas of a gas stove refers to the heat released when water vapor in the flue gas condenses, and is an important component of flue gas waste heat, and recycling can improve thermal efficiency. The core components of the flue gas of the gas stove are nitrogen, carbon dioxide and water vapor, and may also contain a small amount of oxygen, carbon monoxide and nitrogen oxides.

[0003] At present, a waste heat recovery device for a roasting furnace is disclosed in Chinese Patent Application No. CN119934833B, published on June 24, 2025, which comprises the following structure: a converging throat is arranged in the middle of the heat exchange pipeline, the throat protrudes towards the outer side wall of the heat exchange pipeline, the top of the throat is hingedly connected with a first sliding plate, the first sliding plate is slidingly connected with a second sliding plate, the end of the second sliding plate is hingedly connected with a diffusion pipe wall, the diffusion pipe wall is horizontally slidingly arranged in the heat exchange pipeline, the diffusion pipe wall is vertically slidingly connected with a third sliding plate, and a plurality of heat pipe fin heat exchangers are hingedly connected to the outer side wall of the heat exchange pipeline, and the other side of the heat pipe fin heat exchanger connected to the outer side wall of the heat exchange pipeline is hingedly connected with the third sliding plate.

[0004] Through the pipe diameter adjusting mechanism of the heat exchange pipeline, the flue gas flow area is increased according to the flue gas temperature, so that the flue gas is slowed down and pressurized, and the heat pipe fin heat exchanger is arranged at this position, so that the heat exchanger always maintains sufficient contact with the flue gas, so as to liquefy the steam and heat the external hot feed water, thereby realizing waste heat recovery.

[0005] In view of the above related technology, incomplete combustion of gas may occur during use, and when the gas is not fully combusted, a large amount of combustible components may be left in the flue gas, and the content of carbon monoxide may be significantly increased, which may pollute the air environment and may also pose a serious threat to human health. SUMMARY

[0006] The application provides a latent heat extraction and recovery device for flue gas of a gas stove, which utilizes the telescopic function of the telescopic combustion chamber. After the flue gas enters the telescopic combustion chamber, the volume of the telescopic combustion chamber increases, the igniter is controlled to work, carbon monoxide is ignited, air pollution is reduced, and the extraction and recovery of latent heat are facilitated.

[0007] The application provides a latent heat extraction and recovery device for flue gas of a gas stove, which adopts the following technical scheme: a housing, an air inlet main pipe, an air outlet main pipe and a plurality of heat exchange mechanisms; The heat exchange mechanism comprises a telescopic combustion assembly and a plurality of heat exchangers, the telescopic combustion assembly comprises a telescopic combustion chamber, an air inlet branch pipe, an air outlet branch pipe, an air inlet branch pipe control valve, an air outlet branch pipe control valve and an igniter; The telescopic combustion chamber is internally formed with a combustion cavity, the igniter is arranged inside the combustion cavity, and the heat exchanger is arranged outside the combustion chamber and used for heat exchange with flue gas in the combustion cavity, One end of the air inlet branch pipe is communicated with the air inlet manifold, and the other end is communicated with the combustion cavity, the air inlet branch pipe control valve is installed on the air inlet branch pipe, one end of the air outlet branch pipe is communicated with the combustion cavity, and the other end is communicated with the air outlet manifold, and the air outlet branch pipe control valve is installed on the air outlet branch pipe and used for controlling flue gas to enter and discharge the combustion cavity.

[0008] By adopting the above technical scheme, when heat exchange is performed, flue gas discharged from the gas stove enters the heat exchange mechanism through the air inlet manifold, when the flue gas enters the heat exchange mechanism, the air inlet branch pipe control valve controls the flue gas to enter the telescopic combustion chamber through the air inlet branch pipe, after a period of time, the igniter in the telescopic combustion chamber ignites, and unburned carbon monoxide in the flue gas is burned and heat is released; as the air pressure in the telescopic combustion chamber gradually increases, the volume of the combustion cavity gradually expands, when the combustion cavity expands to a certain volume, the air outlet branch pipe control valve controls the flue gas in the telescopic combustion chamber to be discharged from the heat exchange mechanism through the air outlet branch pipe, and then is discharged from the air outlet manifold to the recycling device, when the air inlet branch pipe control valve of one telescopic combustion chamber is controlled to be closed, flue gas discharged from the gas stove enters another telescopic combustion chamber, and the process is repeated in sequence; the heat exchanger continuously absorbs heat in the flue gas during the process that the flue gas enters the telescopic combustion chamber and is ignited. Since the flue gas can be ignited again in the combustion cavity, the amount of carbon monoxide in the flue gas discharged from the recycling device is reduced, and air pollution is reduced; moreover, since heat is released when carbon monoxide is burned, the recycling device can recycle the heat, and the utilization rate of the gas is improved; since the flue gas is always in the combustion cavity during the heat exchange process, after the heat in the flue gas is extracted by the heat exchange mechanism, the flue gas is discharged from the combustion cavity, the heat in the flue gas is deeply extracted, the heat recovery rate is improved, and energy is saved.

[0009] Optionally, the telescopic combustion chamber comprises a top plate, a bottom plate, a plurality of side walls, a same number of connecting plates as the side walls and a spring cylinder group, the top plate and the bottom plate are connected to the pipe wall of the heat exchange mechanism, one end of each of the side walls and the connecting plates is in abutment with the top plate, and the other end is in abutment with the bottom plate, the side walls and the connecting plates are slidingly arranged between the top plate and the bottom plate, the heat exchanger is installed on the side wall, the side walls and the connecting plates are arranged in a spaced manner, one end of the side wall close to the connecting plate is provided with a mounting groove, the connecting plate is slidingly arranged in the mounting groove, the free end of the spring cylinder group is connected to the side wall, and the spring cylinder group is connected to the bottom plate.

[0010] By adopting the technical scheme, the side wall, the connecting plate, the top plate and the bottom plate form opposite sealing areas, temporary storage of flue gas is realized, with the entering of flue gas, the pressure in the combustion chamber becomes larger, the side wall and the connecting plate are driven to move, the side wall extrudes the spring cylinder group, the volume of the combustion chamber is increased, when the spring cylinder group is extruded to the limit position, the gas inlet branch pipe is closed and the gas outlet branch pipe is opened, with the discharge of gas, the spring cylinder group is restored and the combustion chamber is reset. When the igniter is ignited, the gas inlet branch pipe and the gas outlet branch pipe need to be closed at the same time for a period of time, so that the heat exchanger can fully exchange heat. Through continuous charging and discharging, the residence time of flue gas in the combustion chamber is increased, the latent heat is fully released, and the extraction of latent heat is realized for recovery.

[0011] Optionally, the side wall is provided with four, opposite two side walls form a first side wall group, and the other opposite two side walls form a second side wall group, the spring cylinder group includes a first spring cylinder group and a second spring cylinder, the first spring cylinder group is connected to the corresponding first side wall group, the second spring cylinder group is connected to the corresponding second side wall group, the elastic force of the first spring cylinder group is smaller than that of the second spring cylinder group, and the telescopic combustion assembly further includes a contact sensor, the contact sensor is arranged on the sliding track of the side wall belonging to the first side wall group, and the contact sensor is mounted on the first spring cylinder group.

[0012] By adopting the technical scheme, when the combustion chamber expands, the side wall extrudes the spring cylinder group, the first side wall group corresponding to the first spring cylinder group moves fast, after contacting the contact sensor, the first side wall group reaches the limit position, the gas inlet branch pipe control valve closes the gas inlet branch pipe, the igniter is ignited, when the carbon monoxide concentration is high, the flue gas burns and releases heat, when the flue gas in the combustion chamber expands, if the spring elastic force is the same, at this time, the four side walls are equivalent to a rigid whole, which is easy to cause damage to the side wall. Therefore, springs with different elastic forces are adopted, the second spring cylinder can continue to be compressed, damage to the side wall and the like is avoided, and the contact sensor is adopted to facilitate control of the ignition time.

[0013] Optionally, the telescopic combustion assembly further includes a concentration sensor, and the concentration sensor is arranged inside the combustion chamber.

[0014] By adopting the technical scheme, the concentration sensor is arranged to detect the carbon monoxide concentration in the combustion chamber, when the carbon monoxide concentration is high, the igniter is controlled to be ignited, the carbon monoxide is burned and released, and the latent heat utilization rate is improved.

[0015] Optionally, one end of the gas inlet branch pipe away from the gas inlet main pipe is arranged at the middle position of the combustion chamber.

[0016] By adopting the technical scheme, the air inlet branch pipe extends to the middle position of the combustion chamber, which can make the gas uniformly distributed in the combustion chamber, facilitate the detection of the concentration sensor, and can also realize accurate detection without setting multiple concentration sensors in the combustion chamber. When the gas is uniformly distributed, the concentration of carbon monoxide tends to be consistent everywhere in the chamber, which not only helps to realize stable and reliable ignition, but also ensures that the combustion is fully carried out. If the gas is not uniformly distributed, the concentration of carbon monoxide at the position of the concentration sensor may be too high, while the concentration in other areas may be too low. In this case, the local concentration may be insufficient when igniting, which may cause the ignition to fail, thereby reducing the service life of the igniter. In another case, the concentration at the position of the sensor is too low, while the concentration in other areas is too high, which will make the detection signal lower than the actual concentration, causing the system to misjudge, and thus a part of the carbon monoxide that has not been fully combusted is directly discharged into the atmosphere, which not only pollutes the environment, but also may pose a threat to human health. The chemical energy carried by the carbon monoxide that has not been fully combusted cannot be completely released, and the latent heat in the flue gas cannot be effectively recovered, resulting in waste of heat energy and reduction of the utilization rate of flue gas latent heat. Therefore, the reasonable arrangement of the air inlet branch pipe plays an important role in accurate detection, reliable ignition, full combustion, pollution reduction, and energy efficiency improvement. Moreover, condensed water is generated when the flue gas latent heat is released, and the condensed water collects on the bottom plate. If the upper end of the air inlet branch pipe is balanced with the bottom plate, the condensed water may enter the air inlet branch pipe, causing poor exhaust, and the condensed water exchanges heat with the flue gas, causing heat loss.

[0017] Optionally, the upper end of the air inlet branch pipe is sealed and the end portion is provided with gas outlet holes in the circumferential direction.

[0018] By adopting the above technical scheme, when the flue gas flows upward from the inside of the air inlet branch pipe, it is forced to uniformly diffuse and discharge from the gas outlet holes around, thereby forming a more stable airflow field. The local concentration is avoided to be too high or too low due to the concentrated one-way ejection of the flue gas, and the concentration sensor can contact the mixed gas, thereby effectively improving the accuracy and reliability of the detection data.

[0019] Optionally, the igniter is electrically connected with the valve on the heat exchanger.

[0020] By adopting the above technical scheme, when the igniter ignites the carbon monoxide, the heat generated increases, and when the igniter is opened, the opening degree of the valve on the heat exchanger increases, the medium flow rate input into the heat exchanger increases, so that the heat is fully absorbed, and the heat exchange efficiency is improved.

[0021] Optionally, the concentration sensor is installed on the upper end of the air inlet branch pipe.

[0022] By adopting the technical scheme, the concentration sensor detection data is more accurate, the unnecessary ignition times are reduced, the service life of the igniter is prolonged, the chain problems caused by data deviation are avoided, the heat exchanger valve opening is prevented from being abnormally increased, the medium flow is prevented from being too high, the system heat exchange efficiency is helped to be maintained, the energy consumption is reduced, and the long-term stable operation of equipment is ensured.

[0023] Optionally, the heat exchange mechanism further comprises a drain valve, and the drain valve is installed on the bottom plate.

[0024] By adopting the technical scheme, when latent heat of flue gas is released, condensed water is generated, the condensed water is collected on the bottom plate, and the condensed water can be discharged through the drain valve, so that heat exchange with flue gas is reduced, and flue gas heat utilization rate is improved.

[0025] In summary, the present application has at least one of the following beneficial technical effects: 1. By intermittently passing flue gas into the telescopic combustion chamber, the present application increases the residence time of flue gas in the combustion chamber, fully releases latent heat, and realizes extraction and recovery of latent heat. When the concentration of carbon monoxide is high, flue gas combustion releases heat, and the recovery device can recover part of the heat, thereby improving the utilization rate of flue gas. Since the flue gas is always in the combustion chamber during heat exchange, after the heat of the flue gas is extracted by the heat exchange mechanism, the flue gas is discharged from the combustion chamber, so that the heat of the flue gas is deeply extracted, the heat recovery rate is improved, and energy is saved.

[0026] 2. By extending the air inlet branch pipe into the middle position of the combustion chamber, sealing the end of the air inlet branch pipe, and providing an air outlet hole at the upper portion of the air inlet branch pipe, the present application makes the distribution of flue gas more uniform. The concentration sensor is arranged at the top of the air inlet branch pipe, so that the detection data is more accurate, and the unnecessary ignition times are reduced.

[0027] 3. By adopting the contact sensor and the spring cylinder group with different spring forces, when the concentration of carbon monoxide is high, the igniter ignites, flue gas combustion releases heat, flue gas in the combustion chamber expands, and the spring cylinder group with different spring forces is adopted to make part of the side wall continue to move, thereby avoiding damage to the side wall and the connecting plate. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a schematic diagram of the three-dimensional structure of the device in the embodiment of the present application; Figure 2 is a schematic diagram of the internal structure of the heat exchange mechanism after being cut open in the embodiment of the present application; Figure 3 is a schematic diagram of the local structure of the heat exchange mechanism and the water storage mechanism in the embodiment of the present application; Figure 4 is a schematic diagram of the local structure of the telescopic combustion chamber in the embodiment of the present application; Figure 5 is a schematic diagram of the local structure of the telescopic combustion chamber in the embodiment of the present application; Figure 4A local enlarged view of the middle A; Figure 6 Figure 1 is a schematic view of the side wall group, spring cylinder group and contact sensor position in the embodiment of the present application.

[0029] Reference signs: 100, gas outlet manifold; 200, shell; 300, heat exchange mechanism; 310, telescopic combustion assembly; 311, gas outlet branch pipe; 312, gas outlet branch pipe control valve; 313, gas inlet branch pipe control valve; 314, gas inlet branch pipe; 315, igniter; 316, concentration sensor; 320, heat exchanger; 330, drain valve; 340, telescopic combustion chamber; 341, top plate; 342, bottom plate; 343, side wall; 344, connecting plate; 345, spring cylinder group; 346, first side wall group; 347, second side wall group; 348, first spring cylinder group; 349, second spring cylinder group; 350, contact sensor; 400, water storage mechanism; 410, water tank; 420, water pipe; 500, gas inlet manifold. DETAILED DESCRIPTION

[0030] The following will be described in detail in combination with Figures 1 to 6 The present application is further described in detail.

[0031] Reference Figure 1 The present embodiment provides a gas stove flue gas latent heat extraction and recovery device, which comprises a shell 200, a gas inlet manifold 500, a gas outlet manifold 100, a plurality of heat exchange mechanisms 300 and a water storage mechanism 400, wherein the shell 200 is internally provided with the plurality of heat exchange mechanisms 300 and the water storage mechanism 400; flue gas enters the heat exchange mechanism 300 from the gas inlet manifold 500, so that the heat exchanger 320 absorbs the latent heat of the flue gas; when the concentration of carbon monoxide is high, the flue gas is ignited to realize the combustion of carbon monoxide and release heat, thereby reducing air pollution; the water storage mechanism 400 collects the condensed water generated during heat exchange; the flue gas after heat exchange is discharged from the gas outlet manifold 100, so as to realize the full extraction and recovery of latent heat.

[0032] Reference Figures 2-5, the heat exchange mechanism 300 includes telescopic combustion assembly 310, several heat exchanger 320 and hydrophobic valve 330, the telescopic combustion assembly 310 includes telescopic combustion chamber 340, intake branch pipe 314, exhaust branch pipe 311, intake branch pipe control valve 313, exhaust branch pipe control valve 312, igniter 315, concentration sensor 316 and contact sensor 350;The telescopic combustion chamber 340 is formed with a combustion cavity inside, the igniter 315 and the concentration sensor 316 are arranged inside the combustion cavity, the heat exchanger 320 is arranged outside the combustion chamber, is used for heat exchange with the flue gas in the combustion cavity, the contact sensor 350 is arranged outside the combustion chamber, is used for controlling the ignition time of igniter 315, the igniter 315 is connected with the valve electric signal of the heat exchanger on 340, the hydrophobic valve 330 is installed at the bottom of the telescopic combustion chamber 340, one end of the intake branch pipe 314 is communicated with the intake manifold 500, the other end is communicated with the combustion cavity, the intake branch pipe control valve is installed 313 on the intake branch pipe 314, one end of the exhaust branch pipe 311 is communicated with the combustion cavity, the other end is communicated with the exhaust manifold 100, the exhaust branch pipe control valve 312 is installed on the exhaust branch pipe 311, is used for controlling the flue gas into and out of the combustion cavity.

[0033] Reference Figures 2-5 , when heat exchange is carried out, the flue gas discharged from the gas stove enters the heat exchange mechanism 300 through the intake manifold 500, the intake branch pipe control valve 313 controls the flue gas to enter the telescopic combustion chamber 340 through the intake branch pipe 314, after a period of time, the concentration sensor 316 detects the concentration of carbon monoxide, after the concentration reaches the preset value, the igniter 315 in the telescopic combustion chamber 340 ignites, the intake branch pipe control valve 313 and the exhaust branch pipe control valve 312 are closed for a period of time when igniting, so that the unburned carbon monoxide in the flue gas is burned and releases heat;When the igniter 315 ignites carbon monoxide, the heat generated increases, while opening the igniter 315, the opening of the valve on the heat exchanger 320 increases, increasing the medium flow rate input into the heat exchanger, so that it fully absorbs heat and improves the heat exchange efficiency. When the flue gas releases heat, condensate is discharged from the hydrophobic valve 330, as the gas pressure in the telescopic combustion chamber gradually increases, the volume of the combustion cavity gradually expands, when the combustion cavity expands to a certain volume, the exhaust branch pipe control valve 312 controls the flue gas in the telescopic combustion chamber to be discharged from the heat exchange mechanism 300 through the exhaust branch pipe 311, and then discharged from the exhaust manifold 100 to the recycling device, and the flue gas discharged from the gas stove enters another telescopic combustion chamber 340, and circulates in turn.

[0034] Reference Figures 2-5, the heat exchanger 320 continues to absorb the heat in the flue gas during the flue gas entering the telescopic combustion chamber 340 and being ignited. Since the flue gas can be ignited again in the combustion chamber, the amount of carbon monoxide in the flue gas discharged from the recovery device is reduced, reducing air pollution. Moreover, since heat is released when carbon monoxide is burned, the recovery device can recover this part of the heat, improving the utilization rate of the gas. Since the flue gas is always in the combustion chamber during the heat exchange process, the flue gas is discharged from the combustion chamber after the heat in the flue gas is extracted by the heat exchanger 300, so that the heat in the flue gas is deeply extracted, improving the heat recovery rate and saving energy.

[0035] With reference to Figure 4 and 5 , the intake branch pipe 314 is arranged at an intermediate position in the combustion chamber away from one end of the intake manifold 500, the upper end of the intake branch pipe 314 is sealed and the end is provided with gas outlet holes 317 in the circumferential direction, and the concentration sensor 316 and the igniter 315 are installed on the upper end of the intake branch pipe 314. The flue gas in the intake branch pipe 314 is discharged through the gas outlet holes 317, making the distribution of the flue gas more uniform and the detection data of the concentration sensor 316 more accurate, avoiding the chain problems that may be caused by data deviation, causing the heat exchanger valve opening to abnormally increase and the medium flow to be too high, helping to maintain the heat exchange efficiency of the system, reducing energy consumption, and ensuring long-term stable operation of the equipment.

[0036] With reference to Figure 3 and 4 , the telescopic combustion chamber 340 includes a top plate 341, a bottom plate 342, a plurality of side walls 343, a number of connecting plates 344 equal to the number of side walls, and a spring cylinder group 345, the top plate 341 and the bottom plate 342 are connected to the pipe wall of the heat exchange mechanism 300, the drain valve 330 is installed on the bottom plate 342, the intake branch pipe 314 is sealed through the bottom plate 342, the spring cylinder group 345 is connected to the bottom plate 342, the spring force of adjacent spring cylinder groups 345 is different, and the contact sensor 350 is installed on the spring cylinder group 345 with smaller spring force; the side wall 343 is connected to the free end of the spring cylinder group 345, the heat exchanger 320 is installed on the side wall 343, one end of the side wall 343 and the connecting plate 344 abuts against the top plate 341, and the other end abuts against the bottom plate 342, the side wall 343 and the connecting plate 344 are slidingly arranged between the top plate 341 and the bottom plate 342, the side wall 343 and the connecting plate 344 are arranged in a spaced manner to form a square area, one end of the side wall 343 close to the connecting plate 344 is provided with a mounting groove, the connecting plate 344 is slidingly arranged in the mounting groove, and the gas outlet branch pipe 311 is installed on the top plate 341.

[0037] With reference to Figure 6The side wall 343 is provided with four, the opposite two side walls 343 constitute a first side wall group 346, and the other opposite two side walls 343 constitute a second side wall group 347, the spring cylinder group 345 includes a first spring cylinder group 348 and a second spring cylinder group 349, the first spring cylinder group 348 is connected to the corresponding first side wall group 346, and the second spring cylinder group 349 is connected to the corresponding second side wall group 347, the elastic force of the first spring cylinder group 348 is smaller than that of the second spring cylinder group 349, and the contact sensor 350 is arranged on a sliding track of the side wall 343 belonging to the first side wall group 346, and the contact sensor 350 is mounted on the first spring cylinder group 348.

[0038] Reference Figure 3 , 4 and 6, the side wall 343, the connecting plate 344, the top plate 341 and the bottom plate 342 constitute opposite sealing areas, temporary storage of flue gas is realized, with the entry of flue gas, the pressure in the combustion chamber becomes larger, the side wall 343 and the connecting plate 344 are driven to move, the side wall 343 is pressed against the spring cylinder group 345, the volume of the combustion chamber is increased, the first side wall group 346 corresponding to the first spring cylinder group 348 moves at a high speed, after the contact sensor 350 is contacted, the first side wall group 346 reaches a limit position (the free end of the first spring cylinder group 348 is completely entered into the cylinder), and the gas inlet branch pipe control valve 313 closes the gas inlet branch pipe 314. When the carbon monoxide concentration is relatively high, the igniter 315 is ignited, it is required to keep the gas inlet branch pipe 314 and the gas outlet branch pipe 311 closed at the same time for a period of time, so that the heat exchanger 320 can fully exchange heat; when the flue gas in the combustion chamber expands, if the spring elastic force is the same, at this time, the four side walls are equivalent to a rigid whole, which is easy to cause damage to the side wall. Therefore, springs with different elastic forces are adopted, the second spring cylinder group 349 can continue to be compressed, and the side wall 343 and the like are prevented from being damaged. The gas inlet branch pipe 314 is closed, the gas outlet branch pipe 315 is opened, and with the discharge of the gas, the spring cylinder group 345 is restored, and the combustion chamber is reset. Through continuous charging and discharging, the time of flue gas staying in the combustion chamber is increased, the latent heat is fully released, the extraction of the latent heat is realized, and recovery is realized.

[0039] Reference Figure 3 The water storage mechanism 400 includes a water tank 410 and a water pipe 420, the water tank 410 is arranged on the shell 200, one end of the water pipe 420 is communicated with the water tank 410, the water pipe 420 is sealed through the pipe wall of the heat exchange mechanism 300, and the water pipe 420 is communicated with the other end of the water pipe 420. The water discharged by the drain valve 330 is collected into the water tank 410 through the water pipe 420, so that the condensed water is prevented from being stored in the heat exchange mechanism 300.

[0040] The working principle of the embodiment is as follows: The flue gas discharged from the gas stove enters the heat exchange mechanism 300 through the gas inlet main pipe 500, and the flue gas passes through the gas inlet branch pipe control valve 313 and the gas inlet branch pipe 314. The flue gas in the gas inlet branch pipe 314 is discharged through the gas outlet hole 317 to make the flue gas more evenly distributed into the telescopic combustion chamber 340. With the entry of the flue gas, the pressure in the combustion chamber increases, driving the side wall 343 and the connecting plate 344 to move, so that the side wall 343 extrudes the spring cylinder group 345, realizing the expansion of the combustion chamber. The first side wall group 346 moves at a high speed and contacts the contact sensor 350, and the gas inlet branch pipe control valve 313 closes the gas inlet branch pipe 314. The concentration sensor 316 detects the concentration of carbon monoxide. When the concentration reaches the preset value, the igniter 315 in the telescopic combustion chamber 340 ignites. The gas inlet branch pipe control valve 313 and the gas outlet branch pipe control valve 312 are closed for a period of time to make the unburned carbon monoxide in the flue gas burn and release heat; when the igniter 315 ignites the carbon monoxide, the heat generated increases, and at the same time the valve opening of the heat exchanger 320 increases to increase the medium flow into the heat exchanger, so that it can fully absorb heat and improve the heat exchange efficiency. When the flue gas releases heat, condensate is produced and discharged from the drain valve 330. The water discharged from the drain valve 330 is collected in the water tank 410 through the water pipe 420 to avoid the condensate remaining in the heat exchange mechanism 300. As the gas pressure in the telescopic combustion chamber gradually increases, the volume of the combustion chamber gradually expands. When the combustion chamber expands to a certain volume, the gas outlet branch pipe control valve 312 controls the flue gas in the telescopic combustion chamber to be discharged from the heat exchange mechanism 300 through the gas outlet branch pipe 311, and then discharged from the gas recovery device through the gas outlet main pipe 100. When the gas inlet branch pipe control valve 313 of one telescopic combustion chamber 340 is closed, the flue gas discharged from the gas stove enters another telescopic combustion chamber 340, and the cycle is repeated.

[0041] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application. Any equivalent changes made on the basis of the structure, shape, and principle of the present application should be covered by the protection scope of the present application.

Claims

1. A device for recovering latent heat from flue gas of a gas-fired furnace, characterized in that, The utility model relates to a heat exchange device and a heat exchange device system, and relates to the technical field of heat exchange. The heat exchange device comprises a shell (200), an air inlet manifold (500), an air outlet manifold (100) and a plurality of heat exchange mechanisms (300). The heat exchange mechanism (300) comprises a telescopic combustion assembly (310) and a plurality of heat exchangers (320), the telescopic combustion assembly (310) comprises a telescopic combustion chamber (340), an air inlet branch pipe (314), an air outlet branch pipe (311), an air inlet branch pipe control valve (313), an air outlet branch pipe control valve (312) and an igniter (315). The telescopic combustion chamber (340) forms a combustion cavity inside, the igniter (315) is arranged inside the combustion cavity, and the heat exchanger (320) is arranged outside the combustion chamber and used for heat exchange with flue gas in the combustion cavity. One end of the air inlet branch pipe (314) is communicated with the air inlet manifold (500), the other end is communicated with the combustion cavity, the air inlet branch pipe control valve (313) is installed on the air inlet branch pipe (314), one end of the air outlet branch pipe (311) is communicated with the combustion cavity, the other end is communicated with the air outlet manifold (100), and the air outlet branch pipe control valve (312) is installed on the air outlet branch pipe (311) and used for controlling flue gas to enter and discharge the combustion cavity.

2. The device for recovering latent heat from flue gas of a gas stove according to claim 1, characterized in that: The telescopic combustion chamber (340) comprises a top plate (341), a bottom plate (342), a plurality of side walls (343), a same number of connecting plates (344) as the side walls and a spring cylinder group (345), the top plate (341) and the bottom plate (342) are connected to the pipe wall of the heat exchange mechanism (300), one end of the side wall (34) and the connecting plate (344) is in abutment with the top plate (341), the other end is in abutment with the bottom plate (342), the side wall (343) and the connecting plate (344) are slidingly arranged between the top plate (341) and the bottom plate (342), the heat exchanger (320) is installed on the side wall (343), the side wall (343) and the connecting plate (344) are arranged at intervals, one end of the side wall (343) close to the connecting plate (344) is provided with a mounting groove, the connecting plate (344) is slidingly arranged in the mounting groove, the free end of the spring cylinder group (345) is connected to the side wall (343), and the spring cylinder group (345) is connected to the bottom plate (342).

3. The device for recovering latent heat from flue gas of a gas stove according to claim 2, characterized in that: The side wall (343) is provided with four, opposite two side walls (343) constitute a first side wall group (346), the other opposite two side wall (343) constitute a second side wall group (347), the spring cylinder group (345) includes a first spring cylinder group (348) and a second spring cylinder group (349), the first spring cylinder group (348) is connected to the corresponding first side wall group (346), the second spring cylinder group (349) is connected to the corresponding second side wall group (347), the first spring cylinder group (348) is smaller than the elastic force of the second spring cylinder group (349), the telescopic combustion assembly (310) further includes a contact sensor (350), the contact sensor (350) is arranged on the sliding track of the side wall (343) belonging to the first side wall group (346), the first spring cylinder group (348) is mounted with the contact sensor (350).

4. The device for recovering latent heat of flue gas of gas stove according to any one of claims 1-3, characterized in that: The telescopic combustion assembly (310) further includes a concentration sensor (316), and the concentration sensor (316) is arranged in the combustion cavity.

5. The device for recovering latent heat from flue gas of a gas stove according to claim 4, characterized in that: The air inlet branch pipe (314) is arranged at a middle position of the combustion cavity away from one end of the air inlet manifold (500).

6. The device for recovering latent heat from flue gas of a gas stove according to claim 5, characterized in that: The air outlet hole (317) is arranged on the upper end of the air inlet branch pipe (314) and the circumferential end.

7. The device for recovering latent heat from flue gases of gas-fired furnaces according to claim 6, characterized in that: The igniter (315) is electrically connected with the valve on the heat exchanger (320).

8. The device for recovering latent heat from flue gases of gas-fired furnaces according to claim 7, characterized in that: The concentration sensor (316) is mounted on the upper end of the air inlet branch pipe (314).

9. The device for recovering latent heat from flue gases of a gas-fired furnace according to claim 8, characterized in that: The heat exchange mechanism (300) further includes a drain valve (330), and the drain valve (330) is mounted on the bottom plate (342).

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