Outdoor sauna heater energy-saving device capable of recycling waste heat

Abstract

The utility model relates to the technical field of sauna equipment, in particular to an outdoor sauna furnace energy-saving device capable of recycling waste heat, which comprises a sauna furnace and a smoke exhaust pipe communicated with the sauna furnace, and further comprises a heat exchange pipeline which is communicated with the smoke exhaust pipe and comprises an outer pipe and an inner pipe arranged in the outer pipe, a cavity is formed between the inner pipe and the outer pipe, and the inner pipe is communicated with the smoke exhaust pipe; the spiral heat exchange plate is arranged in the inner tube; the air inlet pipe is arranged on the surface above the outer pipe, is communicated with the cavity and is used for introducing fresh air into the cavity; the exhaust pipe is arranged on the surface of the lower part of the outer pipe, is communicated with the cavity and is used for exhausting the preheated air; the smoke outlet pipe is arranged at the top of the inner pipe and used for discharging smoke in the inner pipe; the heat exchange pipeline is arranged behind the smoke exhaust pipe of the sauna furnace, so that smoke waste heat generated by combustion of the sauna furnace is effectively recycled.

Description

Technical Field

[0001] This utility model relates to the field of sauna equipment technology, and in particular to an energy-saving device for outdoor sauna stoves that utilizes waste heat. Background Technology

[0002] The sauna heater is the core equipment of a sauna room, its function being to create a high-temperature environment to provide a comfortable experience for users. Sauna heaters typically use electric heating elements, wood, or gas as fuel, transferring heat to stones inside the heater. These stones store heat and release it slowly, gradually raising the temperature inside the sauna. By heating the stones and adding water as needed, the humidity inside the sauna can be flexibly adjusted to meet the needs of different users. In existing technology, sauna heaters using wood as fuel produce a large amount of smoke during use. To ensure air quality and user safety within the sauna, this smoke needs to be vented outside through pipes.

[0003] However, existing wood-fired sauna stoves typically only emit flue gas without recovering or utilizing the significant amount of heat contained within it. This heat is directly released into the atmosphere, essentially wasting some of the energy generated during combustion, reducing energy efficiency, and increasing operating costs.

[0004] To address the aforementioned issues, existing technologies urgently need improvement. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing an energy-saving outdoor sauna stove that utilizes waste heat.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: an energy-saving device for outdoor sauna stoves that utilizes waste heat, comprising a sauna stove and a flue pipe connected to the sauna stove, and a heat exchange pipeline connected to the flue pipe. The heat exchange pipeline includes an outer pipe and an inner pipe disposed within the outer pipe, with a cavity formed between the inner pipe and the outer pipe. The inner pipe is connected to the flue pipe and is used to receive flue gas. A spiral heat exchange plate is disposed within the inner pipe. An air inlet pipe is disposed on the surface above the outer pipe and is connected to the cavity, used to introduce fresh air into the cavity. An exhaust pipe is disposed on the surface below the outer pipe and is connected to the cavity, used to discharge preheated air. A smoke outlet pipe is disposed at the top of the inner pipe, used to discharge the flue gas inside the inner pipe.

[0007] Compared to existing technologies that directly discharge flue gas, this invention constructs a flue gas-air heat exchange system by adding heat exchange pipes. The flue gas flows within the inner pipes, transferring heat to the air inside the cavity, thus achieving the recovery and utilization of waste heat from the flue gas. This simple and effective structure significantly improves the energy efficiency of the entire sauna system, reduces fuel consumption, and lowers operating costs. For example, in cold environments, the temperature of the fresh air entering the sauna is low; directly introducing it would require a large amount of energy for heating. However, after preheating through the heat exchange pipes of this invention, the temperature of the air entering the sauna increases, thereby reducing the energy required for the sauna furnace to directly heat this air.

[0008] When using the device of this invention, the wood in the sauna stove is first ignited inside the room to generate high-temperature flue gas. The flue gas enters the inner tube of the heat exchange pipeline through the exhaust pipe. Inside the inner tube, the flue gas spirals upward under the guidance of the spiral heat exchange plates, transferring its heat to the tube wall. Simultaneously, fresh air enters the cavity between the outer and inner tubes from the inlet pipe, flows downward along the cavity, absorbs the heat transferred from the inner tube, and its temperature rises. The preheated air is discharged through the exhaust pipe and sent back into the room. After heat exchange, the temperature of the flue gas decreases and it is finally discharged through the exhaust pipe.

[0009] In this process, the sauna stove, exhaust pipe, heat exchange pipeline (including outer pipe, inner pipe, cavity, and spiral heat exchange plate), air inlet pipe, exhaust pipe, and smoke outlet pipe work together to recover and utilize the waste heat of the flue gas, providing preheated fresh air for the sauna room, thereby achieving energy conservation. The sauna stove is the heat source, the exhaust pipe is the flue gas passage, the heat exchange pipeline is the core heat exchange unit, the outer and inner pipes constitute the air and flue gas flow channels and heat exchange surfaces, the cavity is the air flow channel, the spiral heat exchange plate enhances the heat exchange effect on the flue gas side, the air inlet and exhaust pipes are the air inlet and outlet channels, and the smoke outlet pipe is the final flue gas discharge channel.

[0010] Furthermore, both the inner tube and the spiral heat exchange plate are made of thermally conductive materials.

[0011] Furthermore, both the inner and outer walls of the outer tube are provided with insulation layers.

[0012] Furthermore, a fan is connected to the outside of the air intake pipe.

[0013] Furthermore, the exhaust pipe is integrally formed with the sauna stove.

[0014] Furthermore, the heat exchange pipeline is connected to the wall of the building via U-shaped pipe supports and bolts.

[0015] Furthermore, the inner tube and the spiral heat exchange plate are made of stainless steel or heat-resistant alloy.

[0016] Preferably, the insulation layer is made of rock wool.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] By installing a heat exchange pipeline after the exhaust pipe of the sauna stove, the waste heat from the flue gas generated during combustion is effectively recovered. Specifically, the high-temperature flue gas enters the inner tube of the heat exchange pipeline through the exhaust pipe. The spiral heat exchange plate inside the inner tube increases the residence time and heat exchange area of ​​the flue gas, allowing the heat in the flue gas to be efficiently transferred to the fresh air flowing through the cavity between the outer and inner tubes. The preheated fresh air is then returned to the sauna room to replenish the fresh air supply. This technology turns waste into treasure, converting the heat from the originally directly emitted flue gas into usable thermal energy to preheat the fresh air entering the sauna room, thereby significantly reducing the energy consumption required for the sauna stove to heat the fresh air. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of an outdoor sauna stove energy-saving device that utilizes waste heat recycling.

[0020] Figure 2 This is a schematic diagram of the interior of an outdoor sauna stove energy-saving device that utilizes waste heat recycling.

[0021] Figure 3 This is a schematic diagram of a sauna stove in an outdoor sauna stove energy-saving device that utilizes waste heat recycling.

[0022] Figure 4 This is a schematic diagram of the outer pipe in an outdoor sauna stove energy-saving device that utilizes waste heat recycling.

[0023] Figure 5 This is a schematic diagram of the inner cavity of the inner tube in an energy-saving device for outdoor sauna stoves that utilizes waste heat recycling.

[0024] In the diagram: 1. Room body; 2. Room door; 3. Sauna stove; 4. Exhaust pipe; 5. Heat exchange pipe; 6. Outer pipe; 7. Inner pipe; 8. Spiral heat exchange plate; 9. Inlet pipe; 10. Cavity; 11. Exhaust pipe; 12. Smoke outlet pipe; 13. U-shaped pipe support. Detailed Implementation

[0025] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0026] With the pursuit of a healthy lifestyle, sauna activities are becoming increasingly popular, especially outdoor saunas. Wood-fired sauna stoves are favored for their unique heating method and atmosphere. However, traditional wood-fired sauna stoves produce high-temperature flue gas during operation. To ensure air quality and user safety within the sauna, this flue gas needs to be directly discharged outdoors through an exhaust system. This direct discharge method results in a significant waste of the heat contained in the flue gas, reducing energy efficiency and increasing operating costs. To address this issue, this invention proposes an energy-saving device for outdoor sauna stoves that utilizes waste heat. Through a cleverly designed heat exchange structure, the waste heat from the flue gas is used to preheat the fresh air entering the sauna, thereby achieving energy savings.

[0027] like Figures 1 to 5 An energy-saving device for outdoor sauna stoves that utilizes waste heat is shown, comprising a sauna stove 3 and a smoke exhaust pipe 4 connected to the sauna stove 3, and further comprising:

[0028] The heat exchange pipe 5 is connected to the flue pipe 4. The heat exchange pipe 5 includes an outer pipe 6 and an inner pipe 7 installed inside the outer pipe 6. A cavity 10 is formed between the inner pipe 7 and the outer pipe 6. The inner pipe 7 is connected to the flue pipe 4 and is used to receive flue gas.

[0029] Spiral heat exchange plate 8 is installed inside inner tube 7;

[0030] The air intake pipe 9 is disposed on the surface above the outer pipe 6 and is connected to the cavity 10 to introduce fresh air into the cavity 10.

[0031] The exhaust pipe 11 is located on the surface below the outer pipe 6 and is connected to the cavity 10 to discharge preheated air.

[0032] The exhaust pipe 12 is located at the top of the inner pipe 7 and is used to exhaust the flue gas inside the inner pipe 7.

[0033] Compared to existing technologies that directly discharge flue gas, this invention constructs a flue gas-air heat exchange system by adding a heat exchange pipe 5. The flue gas flows within the inner pipe 7, transferring heat to the air within the cavity 10, thus achieving the recovery and utilization of waste heat from the flue gas. This structure is simple and effective, significantly improving the energy efficiency of the entire sauna system, reducing fuel consumption, and lowering operating costs. For example, in cold environments, the temperature of the fresh air entering the sauna is low; direct introduction would require a large amount of energy for heating. However, after preheating through the heat exchange pipe 5 of this invention, the temperature of the air entering the sauna increases, thereby reducing the energy required for the sauna furnace 3 to directly heat this air.

[0034] When using the device of this invention, firstly, inside the room 1, close the door 2 and ignite the wood inside the sauna stove 3 to generate high-temperature flue gas. The flue gas enters the inner tube 7 of the heat exchange pipeline 5 through the exhaust pipe 4. Inside the inner tube 7, the flue gas spirals upward under the guidance of the spiral heat exchange plate 8, transferring its heat to the tube wall of the inner tube 7. At the same time, fresh air enters the cavity 10 between the outer tube 6 and the inner tube 7 from the air inlet pipe 9, flows downward along the cavity 10, absorbs the heat transferred from the inner tube 7, and its temperature rises. The preheated air is discharged through the exhaust pipe 11 and sent back into the room 1. After heat exchange, the temperature of the flue gas decreases and is finally discharged through the exhaust pipe 12.

[0035] In this process, the sauna stove 3, exhaust pipe 4, heat exchange pipe 5 (including outer pipe 6, inner pipe 7, cavity 10, and spiral heat exchange plate 8), air inlet pipe 9, exhaust pipe 11, and smoke outlet pipe 12 work together to recover and utilize the waste heat of the flue gas, providing preheated fresh air for the sauna room, thereby achieving energy saving. Among them, the sauna stove 3 is the heat source, the exhaust pipe 4 is the flue gas passage, the heat exchange pipe 5 is the core heat exchange unit, the outer pipe 6 and inner pipe 7 constitute the air and flue gas flow channels and heat exchange surfaces, the cavity 10 is the air flow channel, the spiral heat exchange plate 8 enhances the heat exchange effect on the flue gas side, the air inlet pipe 9 and exhaust pipe 11 are the air inlet and outlet channels, and the smoke outlet pipe 12 is the final flue gas discharge channel.

[0036] In one embodiment of this utility model, both the inner tube 7 and the spiral heat exchange plate 8 are made of thermally conductive materials.

[0037] In practice, by using thermally conductive materials for the inner tube 7 and the spiral heat exchange plate 8, the efficiency of heat transfer from flue gas to air is significantly enhanced. This means that under the same flue gas flow rate and temperature conditions, more heat can be extracted from the flue gas to preheat fresh air, resulting in a higher air temperature entering the sauna room, thereby further reducing the energy required for the sauna furnace 3 to directly heat this portion of air.

[0038] As one embodiment of this utility model, both the inner and outer walls of the outer tube 6 are provided with a heat insulation layer, which is made of rock wool.

[0039] In implementation, based on the above-described embodiments, to further reduce heat loss from the heat exchange pipeline 5 to the surrounding environment during operation and thus maximize the transfer of flue gas heat to the air within the cavity 10, insulation layers are provided on both the inner and outer walls of the outer pipe 6. This insulation layer is a material with low thermal conductivity, its function being to impede heat conduction and convection. By providing an insulation layer on the inner wall of the outer pipe 6, heat transfer from the hot air within the cavity 10 to the outer pipe 6 body can be reduced; by providing an insulation layer on the outer wall of the outer pipe 6, heat loss from the outer pipe 6 body to the surrounding environment can be reduced.

[0040] By using rock wool as the insulation material, heat exchange between the outer surface of the heat exchange pipe 5 and the surrounding environment can be effectively reduced, thus minimizing heat loss. The porous fiber structure of rock wool effectively hinders air convection and heat conduction, thereby better retaining heat inside the heat exchange pipe 5, especially in the cavity 10 area, ensuring that more heat is absorbed by the fresh air flowing through the cavity 10. The high-temperature resistance of rock wool also allows it to adapt to the operating temperature range of the sauna furnace flue gas waste heat recovery system.

[0041] As one embodiment of this utility model, an external fan is connected to the air intake pipe 9.

[0042] In implementation, based on the above-described embodiments, in order to actively control the flow rate and velocity of fresh air entering the cavity 10 of the heat exchange pipe 5, a fan is connected to the outside of the air inlet pipe 9. This fan can be any type capable of generating the required airflow, such as a centrifugal fan or an axial fan. The fan is connected to the air inlet pipe 9 through its suction port, and its function is to force fresh air from the outside into the cavity 10 between the outer pipe 6 and the inner pipe 7 of the heat exchange pipe 5.

[0043] As one embodiment of this utility model, the exhaust pipe 4 and the sauna stove 3 are integrally formed.

[0044] In implementation, by integrally molding the exhaust pipe 4 and the sauna stove 3, the connecting joint between the two is eliminated. In traditional non-integrated designs, the connection between the exhaust pipe and the sauna stove usually requires additional seals or connectors to ensure sealed exhaust of smoke. These connection points may pose a risk of smoke leakage and increase installation complexity. Integral molding, however, reduces potential leakage points from the outset, improving the sealing reliability of the entire exhaust system.

[0045] In one embodiment of this utility model, the heat exchange pipeline 5 is connected to the wall of the chamber 1 via a U-shaped pipeline bracket 13 and bolts.

[0046] In implementation, to securely install the heat exchange pipe 5 onto the outdoor sauna room structure 1, U-shaped pipe supports 13 and bolts were used as connectors. The U-shaped pipe supports 13 were designed to encircle or support the outer contour of the heat exchange pipe 5, providing support. The U-shaped pipe supports 13 were fixed to the wall of the room structure 1 with bolts, thereby reliably installing the heat exchange pipe 5 in the predetermined position. This connection method allows for adjustment of the number and position of supports according to actual installation needs, ensuring the stability and safety of the heat exchange pipe 5.

[0047] As one embodiment of this utility model, the inner tube 7 and the spiral heat exchange plate 8 are made of stainless steel or heat-resistant alloy.

[0048] By selecting stainless steel or heat-resistant alloys to manufacture the inner tube 7 and spiral heat exchange plate 8, it can be ensured that these key components, which directly contact high-temperature flue gas, can maintain structural integrity and performance stability under harsh operating conditions. These materials can not only effectively conduct heat from the flue gas to the air inside the cavity 10, but also resist corrosion and oxidation that may be caused by high-temperature flue gas, extending the service life of the components and ensuring the long-term reliable operation of the heat exchange pipeline 5.

[0049] Working principle of this utility model:

[0050] First, inside room 1, door 2 is closed, and the wood in sauna stove 3 is ignited to generate high-temperature flue gas. The flue gas enters the inner tube 7 of heat exchange pipe 5 through exhaust pipe 4. Inside inner tube 7, the flue gas spirals upward under the guidance of spiral heat exchange plate 8, transferring its heat to the tube wall of inner tube 7. Simultaneously, fresh air enters the cavity 10 between outer tube 6 and inner tube 7 from air inlet pipe 9, flows downward along cavity 10, absorbs the heat transferred from inner tube 7, and its temperature rises. The preheated air is discharged through exhaust pipe 11 and sent back into room 1. After heat exchange, the temperature of the flue gas decreases, and it is finally discharged through exhaust pipe 12.

[0051] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope. All such changes and modifications fall within the scope of protection claimed by this utility model, which is defined by the appended claims and their equivalents.

Claims

1. An energy-saving device for outdoor sauna stoves that utilizes waste heat, comprising a sauna stove (3) and a smoke exhaust pipe (4) connected to the sauna stove (3), characterized in that, Also includes: The heat exchange pipeline (5) is connected to the flue pipe (4). The heat exchange pipeline (5) includes an outer pipe (6) and an inner pipe (7) disposed in the outer pipe (6). A cavity (10) is formed between the inner pipe (7) and the outer pipe (6). The inner pipe (7) is connected to the flue pipe (4) and is used to receive flue gas. Spiral heat exchange plate (8) is disposed inside the inner tube (7); An air intake pipe (9) is disposed on the surface above the outer pipe (6) and connected to the cavity (10) for introducing fresh air into the cavity (10); An exhaust pipe (11) is disposed on the surface below the outer pipe (6) and connected to the cavity (10) for discharging preheated air. The exhaust pipe (12) is located at the top of the inner pipe (7) and is used to exhaust the smoke inside the inner pipe (7).

2. The outdoor sauna stove energy-saving device for waste heat recycling according to claim 1, characterized in that, Both the inner tube (7) and the spiral heat exchange plate (8) are made of thermally conductive materials.

3. The outdoor sauna stove energy-saving device for waste heat recycling according to claim 1, characterized in that, The inner and outer walls of the outer tube (6) are both provided with a heat insulation layer.

4. The outdoor sauna stove energy-saving device for waste heat recycling according to claim 1, characterized in that, The intake pipe (9) is connected to a fan.

5. The outdoor sauna stove energy-saving device for waste heat recycling according to claim 1, characterized in that, The exhaust pipe (4) and the sauna stove (3) are integrally formed.

6. The outdoor sauna stove energy-saving device for waste heat recycling according to claim 1, characterized in that, The heat exchange pipeline (5) is connected to the wall of the room (1) by U-shaped pipeline bracket (13) and bolts.

7. The outdoor sauna stove energy-saving device for waste heat recycling according to claim 1, characterized in that, The inner tube (7) and the spiral heat exchange plate (8) are made of stainless steel or heat-resistant alloy.

8. The outdoor sauna stove energy-saving device for waste heat recycling according to claim 3, characterized in that, The insulation layer is made of rock wool.

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