A labyrinth type catalytic combustion heater heating core

Abstract

The invention discloses a labyrinth combustion catalytic heater heating core, wherein the inner shell is in the shape of a circular tube, one end of which is closed, and the other end is provided with a hot gas outlet; the combustion-supporting catalytic body is used to support combustion or catalyze the gas, and is also in the shape of a circular tube, coaxially fixedly arranged in the inner shell, and a plurality of mesh holes for gas to pass through are distributed on the side wall; a gas buffer space is provided on the inner side or outer side of the combustion-supporting catalytic body, and a heat exchange space is provided on the outer side or inner side of the combustion-supporting catalytic body opposite to the gas buffer space. The invention can make combustion sufficient.

Description

Technical Field

[0001] The invention relates to catalytic combustion technology heating equipment, in particular to a heating core of a labyrinth type catalytic combustion heater. Background Art

[0002] Fuel heaters heat water by burning fuel gas (such as natural gas, liquefied petroleum gas, city gas, biogas, etc.) to make the water temperature meet the requirements of life and heating, and realize heating and provide hot water for life and bathing. However, a series of problems will arise in the process of combustion and heating, such as incomplete combustion, which not only wastes resources and increases the cost of use, but also produces toxic gases such as CO when the gas is not burned completely, which not only pollutes the air but also harms people's health.

[0003] In order to solve a series of problems existing in combustion heating, people have invented catalytic combustion technology (such as biomass particles, methanol, hydrogen catalytic combustion technology, etc.). Catalytic combustion can enable the fuel to be completely burned at a lower temperature. It plays an extremely important role in improving the combustion process, reducing the reaction temperature, promoting complete combustion, and inhibiting the formation of toxic and harmful substances. It is an environmentally friendly process.

[0004] With the development of society, the application field of catalytic combustion technology continues to expand. The economic, social development and industrialization needs have made catalytic technology, especially catalytic combustion technology, increasingly become an indispensable industrial technology. Catalytic combustion can not only make full use of fuel, but also its technological progress will have a significant impact on social development from the perspective of energy utilization or environmental protection.

[0005] The research on catalytic combustion technology is no longer limited to the theoretical and laboratory levels. What is more practical is the successful research on various new types of catalysts, especially methanol catalysts, which have begun to become an industry and enter our lives.

[0006] At present, the research and application of methanol catalytic combustion technology has entered a stage of rapid development, and its role is increasingly valued by people. For example, the flameless heating device of methanol catalytic combustion technology is a new heating method that can obtain heat energy without burning fuel. This flameless heating device uses methanol to catalyze the reaction in the reactor to generate heat.

[0007] The catalytic combustion technology is applied in coal-fired boilers to realize the lean fuel combustion process, breaking the combustible limit of traditional flame combustion, and can further improve the combustion efficiency and thermal efficiency of gas furnaces. In addition, catalytic combustion technology has also been successfully applied to other fields, such as catalytic combustion of household gas, calcination of cement clinker, etc. It can be seen that the application of catalytic combustion is wide and its significance is great. In the future social development, it has a pivotal position and plays an important role in energy conservation and consumption reduction, rational use of resources and environmental protection. Therefore, vigorously promoting the research work of catalytic combustion technology and actively promoting the application of catalytic combustion technology have profound and positive significance for social development and environmental protection, and have broad development prospects and huge market.

[0008] Although the fuel heaters currently on the market use catalytic technology, they all have a structure in which the catalyst is directly set on the fuel path for catalysis. This will cause a new problem, that is, the catalysis cannot be carried out evenly and fully, which still leads to the problem of incomplete combustion.

[0009] In addition, the existing gas heater can only use a part of the heat transfer wall of the heat exchange device for heat exchange during heating, which affects the heating speed. The main reason for the above problems is that no reasonable inner core is set to reasonably distribute the gas and fully catalyze it. Summary of the invention

[0010] The technical problem to be solved by the present invention is to provide a heating core of a labyrinth-type catalytic combustion heater, which can ensure complete combustion.

[0011] To solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0012] A labyrinth type catalytic combustion heater heating core, characterized by comprising:

[0013] The inner shell is in the shape of a circular tube, one end of which is closed and the other end of which is provided with a hot air outlet;

[0014] The combustion-supporting catalytic body is used to support combustion or catalyze the fuel, and is also in the shape of a circular tube, coaxially fixedly arranged in the inner shell, and has a plurality of mesh holes on the side wall for the fuel to pass through; a gas buffer space is provided on the inner side or outer side of the combustion-supporting catalytic body, and a heat exchange space is provided on the outer side or inner side of the combustion-supporting catalytic body opposite to the gas buffer space;

[0015] When the fuel enters the gas buffer space, it passes through the mesh and the combustion-supporting catalyst, and then generates heat in the heat exchange space to exchange heat with the heat exchange device arranged in the heat exchange space. The gas after heat exchange flows out from the hot gas outlet.

[0016] One of the specific implementation structures is: a sealing head is provided at a sealing cover at one port of the inner shell, and an end circular ring plate is provided at the other port, and the center hole of the end circular ring plate serves as a hot gas outlet; one end face of the combustion-supporting catalytic body is fixedly connected to the end circular ring plate, and the other end face is provided with a circular cover plate, and a gas flow gap is left between the outer ring surface of the circular cover plate and the inner wall of the inner shell, and a gap is left between the outer wall of the combustion-supporting catalytic body and the inner wall of the inner shell to form a gas buffer space, and the inner side of the combustion-supporting catalytic body serves as a heat exchange space; when in use, the external air inlet pipe extends into the space between the circular cover plate and the sealing head.

[0017] The middle part of the inner surface of the sealing head is a convex surface, and the periphery is a concave surface. The convex surface and the concave surface are smoothly connected with the inner surface of the inner shell.

[0018] The convex surface, the concave surface and the inner surface of the inner shell are respectively provided with spiral grooves in the same spiral direction.

[0019] Another specific implementation structure is: one end face of the combustion-supporting catalytic body is fixedly connected to the end face of the closed port of the inner shell, and the other end face of the combustion-supporting catalytic body is provided with an end circular ring plate, and a gap is left between the outer ring surface of the end circular ring plate and the inner wall of the inner shell as a hot gas outlet, and a gap is left between the combustion-supporting catalytic body and the inner wall of the inner shell as a heat exchange space, and the inner side of the combustion-supporting catalytic body is used as a gas buffer space; when in use, the external air inlet pipe extends into the gas buffer space from the middle hole of the end circular ring plate.

[0020] The combustion-supporting catalytic body comprises a cylindrical inner net and a cylindrical outer net, and a granular catalyst or a combustion-supporting agent is filled between the outer net and the inner net.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] When the present invention is in use, the incoming fuel will first be buffered in the gas buffer space, and the combustion-supporting catalyst will perform a certain amount of blocking and buffering on the gas, so that the fuel is more evenly distributed in the gas buffer space and the flow rate of the gas is slowed down. Then, the fuel will pass through the mesh and the combustion-supporting catalyst more evenly under the action of the intake pressure, enter the heat exchange space to generate heat, and perform heat exchange with the entire side of the heat exchange device. The heat exchange area is wide and the utilization rate is high, so that heating is faster. Since the fuel will be dispersed after entering the present invention, and the distribution is more even, the flow rate is smaller, and the combustion-supporting catalyst can fully act on the fuel, so that the fuel can be fully catalyzed and burned. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a three-dimensional schematic diagram of the first embodiment of the present invention;

[0024] Figure 2 is a cross-sectional schematic diagram of embodiment 1 of the present invention;

[0025] Figure 3 is a cross-sectional schematic diagram of a second embodiment of the present invention;

[0026] Figure 4 is a three-dimensional schematic diagram of the first embodiment of the present invention assembled in a heater;

[0027] Figure 5 is an exploded schematic diagram of the first embodiment of the present invention assembled in a heater;

[0028] Figure 6 is a cross-sectional schematic diagram of the first embodiment of the present invention assembled in a heater;

[0029] Figure 7 It is a schematic diagram of the structure of the heater in Example 1 after the upper shell, the lower shell and the heating core are hidden;

[0030] Figure 8 is a schematic diagram of the structure of the heater in Example 1 after the upper shell and the lower shell are hidden;

[0031] Fig. 9 is a cross-sectional schematic diagram of embodiment 3 of the present invention;

[0032] Fig.10 It is a cross-sectional schematic diagram of embodiment 3 of the present invention assembled in a heater.

[0033] Meaning of reference numerals in the figure:

[0034] 1-outer shell; 1.1-upper shell; 1.2-lower shell; 1.3-exhaust port; 1.4-gas buffer chamber; 2-inlet pipe; 2.1-card; 2.1.1-flat support part; 2.1.2-clamping part; 3-heat exchange device; 3.1-inlet and liquid pipe; 3.2-outlet and liquid pipe; 3.3-spiral pipe; 3.4-vertical pipe; 3.5-outer circular pipe wall; 3.6-circular plate; 3.7-inner circular pipe wall; 3.8-buffer net; 3.9-partition plate; 3.10-completed partition; 3.11-notch; 4- Heat-generating inner core; 4.1-sealing head; 4.2-concave surface; 4.3-convex surface; 4.4-air inlet spacing; 4.5-circular cover plate; 4.6-gas circulation gap; 4.7-buffer space; 4.8-combustion-supporting catalytic body; 4.8.1-inner net; 4.8.2-catalyst or combustion-supporting agent; 4.8.3-outer net; 4.9-inner shell; 4.10-convex ring; 4.11-end circular ring plate; 4.12-hot gas outlet; 4.13-middle hole of the end circular ring plate; 4.14-spiral groove; 4.15-heat exchange space. DETAILED DESCRIPTION

[0035] The present invention is further described below in conjunction with embodiments.

[0036] Embodiment 1:

[0037] like Figure 1 and Figure 2 The labyrinth-type catalytic combustion heater heating core 4 shown includes an inner shell 4.9 and a combustion-supporting catalytic body 4.8.

[0038] like Figure 2 As shown, the inner shell 4.9 is in the shape of a circular tube, and a sealing head 4.1 is provided at the sealing cover at the upper port of the inner shell 4.9, and an end circular ring plate 4.11 is provided at the lower port. The middle hole 4.13 of the end circular ring plate 4.11 serves as a hot gas outlet, and the lower end surface of the combustion-supporting catalytic body 4.8 is fixedly connected to the end circular ring plate 4.11, so that the combustion-supporting catalytic body 4.8 is coaxially fixedly arranged in the inner shell 4.9, and a certain distance is left between the upper end of the combustion-supporting catalytic body 4.8 and the inner surface of the sealing head 4.1, and a circular cover plate 4.5 is provided on the upper end surface of the combustion-supporting catalytic body 4.8, and a gas flow gap 4.6 is left between the outer ring surface of the circular cover plate 4.5 and the inner wall of the inner shell, and a gap is left between the outer wall of the combustion-supporting catalytic body 4.8 and the inner wall of the inner shell 4.9, forming a gas buffer space 4.7, and the gas buffer space 4.7 is located on the outer side of the combustion-supporting catalytic body 4.8, and the inner side of the combustion-supporting catalytic body 4.8 serves as a heat exchange space 4.15.

[0039] The combustion-supporting catalytic body 4.8 of this embodiment comprises a cylindrical inner net 4.8.1 and a cylindrical outer net 4.8.3, and a granular catalyst or combustion-supporting agent 4.8.2 is filled between the outer net 4.8.3 and the inner net 4.8.1. The structure of the combustion-supporting catalytic body 4.8 can also be that the combustion-supporting catalytic body is directly made into a net shape as a whole, in which case the material used is itself the catalyst or the combustion-supporting agent.

[0040] When in use, the heat exchange device is arranged in the heat exchange space 4.15, and the external air intake pipe passes through the middle hole 4.14 of the annular cover plate 4.5 and extends into the space between the annular cover plate 4.5 and the sealing head 4.1. The fuel entering from the air intake pipe first enters the space between the annular cover plate 4.5 and the sealing head 4.1, and then enters the gas buffer space 4.7 through the gas flow gap 4.6. Due to the blocking effect of the combustion-supporting catalytic body 4.8, the fuel will be buffered in the gas buffer space 4.7 to a certain extent, and then pass through the mesh to pass through the combustion-supporting catalytic body 4.8 more evenly, and enter the heat exchange space 4.15. In the heat exchange space 4.15, heat is generated by combustion or chemical reaction to exchange heat with the heat exchange device. The gas after heat exchange continuously flows to the hot gas outlet 4.12 under the action of air pressure and flows out from the hot gas outlet. It can be seen that the fuel is not discharged directly after combustion, but like entering a maze, after many twists and turns.

[0041] The above-mentioned fuel can be a mixed fuel of gas and air, or a mixed fuel of atomized methanol and air, or hydrogen, or other conventional fuels. Different mixed fuels require different choices when used. Take the above two mixed fuels as examples: when a mixed fuel of gas and air is used, a combustion-supporting catalyst is provided in the combustion-supporting catalyst body, and an ignition device of conventional means is also provided. The ignition device ignites in the heat exchange space to ignite the gas. When a mixed fuel of atomized methanol and air is used, a catalyst (methanol catalyst) is provided in the combustion-supporting catalyst body. When the mixed gas of atomized methanol and air passes through the combustion-supporting catalyst body, methanol contacts the catalyst to react chemically and generate heat, and an ignition device is no longer needed at this time. The fuel can be fed in by a blower in conventional means to send air and a methanol quantitative control flowmeter to send methanol, or the fuel can be delivered by an aerator.

[0042] The middle of the inner surface of the sealing head 4.1 of this embodiment is a convex surface 4.3, and the periphery is a concave surface 4.2, and the convex surface 4.3 and the concave surface 4.2 are smoothly connected with the inner surface of the inner shell 4.9. When the gas is ejected from the inner end of the air inlet pipe 2, it first sprays to the convex surface 4.3, and is evenly dispersed to the periphery under the action of the convex surface 4.3, and then flows to the side under the guidance of the convex surface 4.3, and flows downward along the inner surface of the inner shell 4.9, so that the gas distribution is more uniform and plays a buffering role.

[0043] like Figures 4 to 8 The figure shows a schematic diagram of the structure when the heating core 4 of this embodiment is installed in a labyrinth-type catalytic combustion heater. In addition to the heating core 4, the labyrinth-type catalytic combustion heater also includes an outer shell 1, an air intake pipe 2 and a heat exchange device 3.

[0044] The outer shell 1 is cylindrical, closed at both ends, and has a gas buffer chamber 1.4 inside, and an exhaust port 1.3 connected to the gas buffer chamber 1.4 at the upper end. In order to maintain the components inside the outer shell 1, the outer shell 1 is configured as an upper shell 1.1 and a lower shell 1.2, and the upper shell 1.1 and the lower shell 1.2 are connected by a threaded seal.

[0045] The air intake pipe 2 passes into the gas buffer cavity 1.4, and passes out from the lower end of the outer shell 1. Of course, the position of the exit hole needs to be sealed. The outer end of the air intake pipe 2 located outside the outer shell 1 is used to connect with the external air pipe, and the exhaust port 1.3 and the position where the air intake pipe 2 passes out are located at opposite ends of the outer shell.

[0046] The heat exchange device 3 is in the shape of a round tube and is sleeved on the air inlet pipe 2. The heat exchange device 3 can be fixed on the air inlet pipe 2 by welding. The heat exchange device 3 is located in the gas buffer chamber 1.4, and the lower end is provided with an air inlet liquid pipe 3.1 and an air outlet liquid pipe 3.2 extending to the outside of the outer shell 1. The air inlet liquid pipe 3.1 and the air outlet liquid pipe 3.2 extend outward along the outer wall of the air inlet pipe 2. What enters the heat exchange device can be liquid or gas. The liquid or gas to be heated enters the heat exchange device 3 through the air inlet liquid pipe, and the liquid or gas after heat exchange flows out through the air outlet liquid pipe. Of course, the heat exchange device 3 is made of heat-conducting material, such as metal material.

[0047] The heating core 4 of this embodiment is detachably mounted on the portion of the intake pipe 2 located in the gas buffer chamber 4.4 through a snap-fit ​​structure, and the heat exchange device 3 is located in the heating core 4.8. The intake pipe 2 penetrates into the combustion-supporting catalyst body 4 through the middle hole 4.13 of the end circular ring plate 4.11, and the inner end of the intake pipe 2 also passes through the middle hole of the circular ring cover plate and extends into the space between the circular ring cover plate and the sealing head. The heat exchange device 3 is located in the heat exchange space inside the combustion-supporting catalyst body 4, and a gap is left between the inner ring surface of the end circular ring plate 4.11 and the side wall of the intake pipe 2, and the inner ring surface of the circular ring cover plate 4.5 is tightly attached to the outer wall of the intake pipe 2, and an intake spacing 4.4 is left between the end face of the intake pipe 2 and the inner face of the sealing head 4.1.

[0048] When in use, the gas flowing out from the hot gas outlet 4.12 enters the gas buffer chamber 1.4. When the gas in the gas buffer chamber 1.4 accumulates to a certain amount, it is naturally discharged from the exhaust port 1.3. The gas accumulated in the gas buffer chamber also plays a certain role in thermal insulation.

[0049] The above-mentioned buckle structure includes four cards 2.1 fixed on the air inlet pipe and a convex ring 4.10 provided on the outer wall of the end of the inner shell 4.9 provided with the hot air outlet 4.12. The four cards 2.1 are evenly distributed in the circumferential direction, and a space is reserved between adjacent cards 2.1 so that the gas from the hot air outlet 4.12 can pass through the space and enter the gas buffer chamber. Figure 5 As shown, the card 2.1 includes a flat support portion 2.1.1 extending radially along the air inlet pipe 2 and an arc-shaped clamping portion 2.1.2 provided on the outer edge of the flat support portion 2.1.1. When the heating core 4 is buckled on the air inlet pipe 2, the corresponding end surface of the heating core 4 is flatly supported on the surface of the flat support portion 2.1.1, and the clamping portion 2.1.2 is buckled on the convex ring 4.10, thereby achieving the clamping connection.

[0050] The above-mentioned heat exchange device 3 includes two spiral tubes 3.3, one end of the two spiral tubes 3.3 close to the air inlet and liquid pipes and the air-liquid outlet pipes are respectively connected to the air inlet and liquid pipes 3.1 and the air-liquid outlet pipes 3.2, and the other ends away from the air inlet and liquid pipes 3.1 and the air-liquid outlet pipes 3.2 are connected to each other to form a liquid channel, thereby forming a double helix structure, so that the liquid can flow in and out in the same direction, and the installation of the heat exchange device is simpler.

[0051] Embodiment 2:

[0052] like Figure 3 The figure shows a schematic diagram of the structure of the heating core of the labyrinth catalytic combustion heater of the second embodiment. In order to make the fuel more uniform, the second embodiment has spiral grooves 4.14 in the same spiral direction provided on the convex surface 4.3, the concave surface 4.2 and the inner surface of the inner shell 4.9. Part of the gas will move along the spiral direction of the spiral groove 4.14 to form a certain rotating airflow, so that the fuel is more evenly distributed.

[0053] Embodiment three:

[0054] The difference between the heating core of the labyrinth type catalytic combustion heater of the third embodiment and the heating core of the labyrinth type catalytic combustion heater of the first embodiment is that the heat exchange space 4.15 is located outside the combustion-supporting catalyst body 4.8, and the gas buffer space 4.7 is located inside the combustion-supporting catalyst body 4.8.

[0055] Specifically: Fig. 9 As shown, the upper end face of the combustion-supporting catalytic body 4.8 is fixedly connected to the end face of the upper closed port of the inner shell 4.9, and the lower end face of the combustion-supporting catalytic body 4.8 is provided with an end circular ring plate 4.11, and a gap is left between the outer ring surface of the end circular ring plate 4.11 and the inner wall of the inner shell 4.9, which serves as a hot gas outlet 4.12, and a gap is left between the combustion-supporting catalytic body 4.8 and the inner wall of the inner shell 4.9, which serves as a heat exchange space 4.15, and the inner side of the combustion-supporting catalytic body 4.8 serves as a gas buffer space 4.7.

[0056] When in use, the external air inlet pipe extends from the middle hole 4.13 of the end circular ring plate 4.11 into the gas buffer space. The gas entering from the air inlet pipe first enters the gas buffer space 4.7. After a certain buffering in the gas buffer space 4.7, the gas passes through the mesh and the combustion-supporting catalytic body 4.8 more evenly and enters the heat exchange space 4.15. In the heat exchange space 4.15, heat is generated by combustion or chemical reaction to exchange heat with the heat exchange device. The gas after heat exchange continuously flows to the hot gas outlet 4.12 under the action of gas pressure and flows out from the hot gas outlet.

[0057] like Fig.10The structure diagram of the heating core of the second embodiment when it is installed in the labyrinth catalytic combustion heater is shown. A spacing is provided between the inner side of the circular tubular heat exchange device 3 of the labyrinth catalytic combustion heater and the outer side wall of the air inlet pipe 2. The heat exchange device 3 is fixedly connected to the air inlet pipe 2 through one end thereof connected to the air inlet liquid pipe and the air outlet liquid pipe. The connection method can be welding. The circular tubular heat exchange device 3 penetrates between the combustion-supporting catalytic body 4.8 and the inner shell 4.9 through the hot gas outlet 4.12. The air inlet pipe 2 penetrates into the gas buffer space inside the combustion-supporting catalytic body 4.8 through the middle hole of the end circular ring plate 4.11. The upper end of the air inlet pipe 2 abuts against the upper end closing plate of the inner shell 4.9. A plurality of air outlet holes 2.2 are provided on the side wall of the portion of the air inlet pipe 2 located inside the combustion-supporting catalytic body 4.8. The inner ring surface of the end circular ring plate 4.11 is tightly attached to the outer side wall of the air inlet pipe 2.

[0058] When in use, the fuel entering from the air inlet pipe 2 first enters the buffer space 4.7 from the air outlet 2.2, and then passes through the combustion-supporting catalyst 4.8 from the mesh. The fuel passing through the combustion-supporting catalyst 4.8 generates heat through combustion or chemical reaction to exchange heat with the heat exchange device 3. The gas after heat exchange continuously flows toward the hot gas outlet 4.12 under the action of air pressure, and passes through the hot gas outlet 4.12 into the gas buffer chamber 1.4. When the gas in the gas buffer chamber 1.4 accumulates to a certain amount, it is naturally discharged from the exhaust port.

[0059] The present invention can be used in direct heating heat pump equipment, hot and cold water floor heating equipment, household water circulation equipment, high-temperature hot water, drying equipment, constant temperature breeding, swimming pool equipment, hot and cold water dual-purpose unit equipment, jet enthalpy increase ultra-low temperature heating heat pump equipment, air conditioning hot water units, large and small industrial and household equipment, etc.

[0060] The above embodiments of the present invention are not intended to limit the protection scope of the present invention, and the implementation modes of the present invention are not limited thereto. All other modifications, replacements or changes made to the above structures of the present invention based on the above contents of the present invention, in accordance with common technical knowledge and customary means in the art, without departing from the above basic technical ideas of the present invention, should fall within the protection scope of the present invention.

Claims

1. A labyrinth type catalytic combustion heater heating core, characterized in that: include: The inner shell is in the shape of a circular tube, one end of which is closed and the other end of which is provided with a hot air outlet; The combustion-supporting catalytic body is used to support combustion or catalyze the fuel, is also in the shape of a circular tube, is coaxially fixedly arranged in the inner shell, and has a plurality of mesh holes on the side wall for the fuel to pass through; a gas buffer space is provided on the inner side or outer side of the combustion-supporting catalytic body, and a heat exchange space is provided on the outer side or inner side of the combustion-supporting catalytic body opposite to the gas buffer space; When the fuel enters the gas buffer space, it passes through the combustion-supporting catalytic body from the mesh, generates heat in the heat exchange space, and exchanges heat with the heat exchange device arranged in the heat exchange space, and the gas after heat exchange flows out from the hot gas outlet; A sealing head is provided at a sealing cover at one end of the inner shell, and an end circular ring plate is provided at the other end, and a center hole of the end circular ring plate serves as the hot gas outlet; one end face of the combustion-supporting catalytic body is fixedly connected to the end circular ring plate, and the other end face is provided with a circular cover plate, a gas flow gap is left between the outer ring surface of the circular cover plate and the inner wall of the inner shell, a gap is left between the outer side wall of the combustion-supporting catalytic body and the inner side wall of the inner shell, forming the gas buffer space, and the inner side of the combustion-supporting catalytic body serves as the heat exchange space; when in use, the external air inlet pipe extends into the space between the circular cover plate and the sealing head; The middle part of the inner surface of the sealing head is a convex surface, and the periphery is a concave surface, and the convex surface and the concave surface are smoothly connected with the inner surface of the inner shell; The convex surface, the concave surface and the inner surface of the inner shell are respectively provided with spiral grooves in the same spiral direction; It also includes a heat exchange device, which includes two spiral tubes. One end of the two spiral tubes close to the air inlet and liquid pipes and the air-liquid outlet pipes are connected to the air inlet and liquid pipes respectively, and the other ends away from the air inlet and liquid pipes are connected to each other to form a liquid channel, thereby forming a double helix structure.

2. The heating core of the labyrinth type catalytic combustion heater according to claim 1 is characterized in that: One end face of the combustion-supporting catalytic body is fixedly connected to the end face of the closed port of the inner shell, and the other end face of the combustion-supporting catalytic body is provided with an end circular ring plate. A gap is left between the outer ring surface of the end circular ring plate and the inner wall of the inner shell as the hot gas outlet. A gap is left between the combustion-supporting catalytic body and the inner wall of the inner shell as the heat exchange space, and the inner side of the combustion-supporting catalytic body serves as the gas buffer space. When in use, an external air inlet pipe extends into the gas buffer space from the center hole of the end circular ring plate.

3. The heating core of the labyrinth type catalytic combustion heater according to claim 2 is characterized in that: The combustion-supporting catalytic body comprises a cylindrical inner net and a cylindrical outer net, and a granular catalyst or a combustion-supporting agent is filled between the outer net and the inner net.

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