An energy-saving heat exchanger

Abstract

This utility model belongs to the technical field of heat exchange devices and discloses an energy-saving heat exchanger, including a base. An outer cylinder, a middle cylinder, and an inner cylinder are fixedly connected to the top of the base to form an outer cavity and a middle cavity. An air outlet pipe is provided at the bottom of the middle cylinder. A tubular heat exchange core is provided in the upper part of the inner cylinder to form an inner cavity. An air inlet pipe is provided at the lower end of the heat exchange core. A diversion hole communicating with the outer cavity is opened on the air inlet pipe. The air outlet of the heat exchange core is connected to the inner cavity. A cylinder cover is provided at the top of the outer cylinder. An upper cavity layer and a lower cavity layer communicating with the outer cavity and the middle cavity are provided inside the cylinder cover. The inner cavity is connected to the lower cavity layer. An airflow regulator is provided on the outer wall of the air inlet pipe. This utility model, by setting an outer cavity, facilitates the isolation of heat dissipated by the heat exchanger and can bring the heat lost from the outer layer of the heat exchanger back to the heat exchanger for secondary use. By setting a lower cavity layer, it facilitates the full mixing of hot air and cold air. By setting an airflow regulator, it facilitates the adjustment of the air ratio entering the outer cavity and the heat exchange core.

Description

Technical Field

[0001] This utility model relates to an energy-saving heat exchanger and belongs to the technical field of heat exchange devices. Background Technology

[0002] A heat recovery heat exchanger is a device used to recover and utilize waste heat during energy transfer. It achieves energy recovery by transferring waste heat from one fluid (such as flue gas or high-temperature exhaust gas) to another fluid (such as air), which can significantly improve energy utilization efficiency and reduce energy consumption. Shell-and-tube heat exchangers, also known as tube-and-tube heat exchangers, are indirect heat exchangers that use the walls of tube bundles enclosed in a shell as the heat transfer surface. They are simple in structure, low in cost, and have a wide flow cross-section, making them commonly used heat recovery heat exchangers. However, the outer walls of existing shell-and-tube heat exchangers are mostly directly exposed metal shells, causing heat to dissipate. Alternatively, insulation layers made of thermal insulation materials are installed on the outer walls to ensure equipment safety and prevent burns. Such heat exchangers cannot effectively utilize the heat dissipated by the heat exchanger, resulting in energy waste to some extent. Therefore, an energy-saving heat exchanger that can easily utilize the heat dissipation from the heat exchanger is needed. Summary of the Invention

[0003] The purpose of this invention is to provide an energy-saving heat exchanger.

[0004] To achieve the above objectives, this utility model adopts the following technical solution: An energy-saving heat exchanger includes a base. The top of the base is fixedly connected to an outer cylinder, a middle cylinder, and an inner cylinder, which are sequentially nested from the outside to the inside. A certain distance is left between the outer walls of the outer cylinder and the middle cylinder, and between the middle cylinder and the inner cylinder, forming an outer cavity and a middle cavity sequentially from the outside to the inside. The lower part of the inner cavity of the inner cylinder is a settling chamber, connected to a flue gas inlet pipe. The flue gas inlet pipe communicates with the settling chamber but is not connected to the outer cavity or the middle cavity. The bottom of the middle cylinder is connected to an air outlet pipe, which penetrates the outer cylinder and extends to the outside of the outer cylinder. The air outlet pipe communicates with the middle cavity but is not connected to the inner cavity or the outer cavity. A tubular heat exchange core is installed on the upper part of the inner cylinder. A certain distance is left between the inner wall of the inner cylinder and the outer wall of the tubular heat exchange core, forming an inner cavity. The cavity is not connected to the settling chamber. The lower end of one side of the tubular heat exchange core is connected to an air inlet pipe. The air inlet pipe passes through the inner cylinder, middle cylinder, and outer cylinder in sequence and is connected to an external fan. The air inlet pipe is connected to the tubular heat exchange core. The air inlet pipe is connected to the outer cavity through multiple flow-diverting holes opened on the pipe wall. The air inlet pipe is not connected to the middle cavity and inner cavity. The air outlet on the upper side of the tubular heat exchange core is connected to the inner cavity. The top of the tubular heat exchange core is connected to a conical guide shroud. The top of the guide shroud is connected to a smoke exhaust pipe. The top of the outer cylinder is fixedly connected to a cylinder cover by a flange. The cylinder cover has an upper cavity layer and a lower cavity layer that are connected to the outer cavity and the middle cavity in sequence from top to bottom. The top of the inner cylinder and the upper cavity layer are both connected to the lower cavity layer. The smoke exhaust pipe passes through the cylinder cover and extends to the outside of the cylinder cover. An airflow regulator is provided on the outer wall of the air inlet pipe.

[0005] Preferably, the outer cylinder, middle cylinder, and inner cylinder are arranged concentrically, and the cross-sections of the outer cylinder, middle cylinder, and inner cylinder are circular, elliptical, rectangular, regular pentagonal, regular hexagonal, or regular octagonal.

[0006] Preferably, the cylinder cover includes an outer cover, a middle cover, and an inner cover that are sequentially fitted from the outside to the inside. The bottoms of the outer cover, the middle cover, and the inner cover are respectively sealed and overlapped with the tops of the outer cylinder, the middle cylinder, and the inner cylinder. The outer cover, the middle cover, and the inner cover are respectively provided with a circular first through hole, a second through hole, and a third through hole in their centers. A certain gap is left between the outer cover and the middle cover, and between the middle cover and the inner cover, forming an upper cavity layer and a lower cavity layer in the shape of "┌ ┐". The middle cover and the inner cover are respectively fixedly connected to the outer cover and the middle cover. The exhaust pipe passes through the first through hole, the second through hole, and the third through hole sequentially from top to bottom. The inner wall of the first through hole is slidably fitted with the outer wall of the exhaust pipe. The diameters of the second through hole and the third through hole are larger than the diameter of the first through hole. The middle cover and the inner cover do not contact the outer wall of the exhaust pipe. The upper cavity layer is connected to the lower cavity layer through the second through hole, and the lower cavity layer is connected to the inner cavity layer through the third through hole.

[0007] Preferably, a sealing ring is connected to the bottom of the outer cover, the middle cover, or the inner cover, or to the top of the outer cylinder, the middle cylinder, or the inner cylinder.

[0008] Preferably, the shell-and-tube heat exchange core includes a shell, the lower end of one side of the shell is connected to an air inlet pipe, and the upper part of the other side has one or more air outlet holes. The inner cavity of the shell is provided with a plurality of arrayed heat exchange tubes. The two ends of the heat exchange tubes extend to the outside of the shell and are respectively connected to the settling chamber and the flow guide shroud. The heat exchange tubes are not connected to the inner cavity and inner layer cavity of the shell. The outer wall of the heat exchange tubes is provided with a plurality of fins.

[0009] Preferably, an ash outlet is provided at the bottom of one side of the settling chamber. The ash outlet passes through the inner cylinder, the middle cylinder and the outer cylinder in sequence and is connected to a door. The ash outlet is connected to the settling chamber but not to the outer cavity or the middle cavity. The inner bottom surface of the settling chamber is a downward sloping surface near the ash outlet.

[0010] Preferably, the airflow regulator includes an adjusting sleeve threaded onto the outer wall of the air inlet pipe. The adjusting sleeve slides through the side wall of the outer cylinder and extends into the outer cavity, covering the diversion holes on the air inlet pipe.

[0011] Preferably, the outer wall of the end of the adjusting sleeve located outside the outer cylinder is provided with anti-slip texture or rubber anti-slip pad.

[0012] Preferably, the lower cavity layer is provided with a conical guide plate that separates the inner cavity of the inner cylinder and the upper cavity layer.

[0013] Preferably, the air inlet pipe is equipped with a water-absorbing cotton filter at one end located outside the outer cylinder, and the air outlet pipe is equipped with a temperature sensor on its inner wall.

[0014] Beneficial effects

[0015] This energy-saving heat exchanger utilizes an outer cavity for cold air circulation, eliminating the need for an external insulation layer. This facilitates heat isolation, increases safety, and prevents burns. Simultaneously, it allows heat lost from the outer cavity to be recycled, saving energy. A lower cavity within the cylinder cover facilitates thorough mixing of hot and cold air, ensuring a stable and uniform temperature. An intermediate cavity allows for the utilization of heat dissipated from the tubular heat exchange core and the outer wall of the settling chamber, further enhancing heat isolation in the outer cavity. An airflow regulator allows for adjustment of the airflow ratio between the outer cavity and the tubular heat exchange core, thus regulating the temperature of the mixed gas. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a side sectional view of the present invention.

[0018] Figure 3 for Figure 2 Enlarged view of point A in the image;

[0019] Figure 4 This is a bottom view of the structure of the middle cylinder cover of this utility model;

[0020] Figure 5 This is a side sectional view of the airflow regulator in this utility model.

[0021] In the diagram: 1. Base; 2. Outer cylinder; 3. Middle cylinder; 4. Inner cylinder; 5. Outer cavity; 6. Middle cavity; 7. Settling chamber; 8. Smoke inlet pipe; 9. Air outlet pipe; 10. Shell and tube heat exchange core; 11. Inner cavity; 12. Air inlet pipe; 13. Diversion orifice; 14. Flow guide hood; 15. Smoke exhaust pipe; 16. Flange; 17. Cylinder cover; 18. Upper cavity layer; 19. Lower cavity layer; 20. Outer cover; 21. Middle cover; 22. Inner cover; 23. Adjusting sleeve; 24. Conical guide plate. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] like Figure 1-5As shown, this utility model provides a technical solution: an energy-saving heat exchanger, including a base 1, with an outer cylinder 2, a middle cylinder 3, and an inner cylinder 4 sequentially connected from the outside to the inside to the top of the base 1. A certain distance is left between the outer walls of the outer cylinder 2 and the middle cylinder 3, and between the middle cylinder 3 and the inner cylinder 4, forming an outer cavity 5 and a middle cavity 6 sequentially from the outside to the inside. The outer cylinder 2, the middle cylinder 3, and the inner cylinder 4 are concentrically arranged. The cross-sections of the outer cylinder 2, the middle cylinder 3, and the inner cylinder 4 are circular, elliptical, rectangular, regular pentagonal, regular hexagonal, or regular octagonal. The lower part of the inner cavity of the inner cylinder 4 is a settling chamber 7, connected to an inlet pipe 8 that sequentially penetrates the inner cylinder 4, the middle cylinder 3, and the outer cylinder 2 and communicates with the exhaust port of a biomass combustion furnace. The inlet pipe 8 is connected to the settling chamber 7 and the outer cavity. 5. The intermediate cavity 6 is not connected. An ash outlet is located at the bottom of one side of the settling chamber 7. The ash outlet passes sequentially through the inner cylinder 4, middle cylinder 3, and outer cylinder 2, and is connected to a door. The ash outlet is connected to the settling chamber 7, but not to the outer cavity 5 or the intermediate cavity 6. The inner bottom surface of the settling chamber 7 is a downward-sloping surface near the ash outlet. An air outlet pipe 9 is connected to the bottom of one side of the middle cylinder 3. The air outlet pipe 9 passes through the outer cylinder 2 and extends to the outside of the outer cylinder 2, connecting to the air inlet of the camellia fruit drying device for drying camellia fruit. The air outlet pipe 9 is connected to the intermediate cavity 6, but not to the inner cavity of the inner cylinder 4 or the outer cavity 5. A tubular heat exchange core 10 is installed on the upper part of the inner cylinder 4. A certain gap is left between the inner wall of the inner cylinder 4 and the outer wall of the tubular heat exchange core 10, forming a... The inner cavity 11 is not connected to the settling chamber 7. An air inlet pipe 12 is connected to the lower end of one side of the tubular heat exchange core 10. The air inlet pipe 12 passes sequentially through the inner cylinder 4, middle cylinder 3, and outer cylinder 2, connecting to an external fan. The air inlet pipe 12 is connected to the inner cavity of the tubular heat exchange core 10. The air inlet pipe 12 is connected to the outer cavity 5 through multiple branch flow holes 13 on the pipe wall. The air inlet pipe 12 is not connected to the middle cavity 6 or the inner cavity 11. The air outlet on the upper side of the tubular heat exchange core 10 is connected to the inner cavity 11. A conical guide hood 14 is connected to the top of the tubular heat exchange core 10 to facilitate guiding the flue gas after heat exchange into the exhaust pipe 15. The inner cavity of the guide hood 14 is connected to the settling chamber 7 and the inner cavity 11 through the heat exchange tubes of the tubular heat exchange core 10. The top of the flow guide hood 14 is connected to a smoke exhaust pipe 15, which is connected to the flow guide hood 14 but not to the upper cavity 18, lower cavity 19, or inner cavity 11. The flue gas after heat exchange is discharged into a purification device through the smoke exhaust pipe 15 for purification before being discharged. The smoke exhaust pipe 15 extends to the outside of the cylinder cover 17 and is connected to flue gas purification devices such as bag filters, water mist filters, and water bath filters. A sealing ring is provided at the connection between the outer wall of the smoke exhaust pipe 15 and the cylinder cover 17 to prevent heat leakage. The top of the outer cylinder 2 is fixedly connected to the cylinder cover 17 via a flange 16. Inside the cylinder cover 17, from top to bottom, are the upper cavity 18 and lower cavity 19, which are respectively connected to the outer cavity 5 and the middle cavity 6. The top of the inner cylinder 4 and the upper cavity 18 are both connected to the lower cavity 19.The exhaust pipe 15 penetrates the cylinder cover 17 in the thickness direction and extends to the outside of the cylinder cover 17. An airflow regulator is provided on the outer wall of the air inlet pipe 12 to adjust the airflow entering the outer cavity 5.

[0024] Specifically, the cylinder cover 17 includes an outer cover 20, a middle cover 21, and an inner cover 22, which are sequentially fitted from the outside to the inside. The bottoms of the outer cover 20, the middle cover 21, and the inner cover 22 are respectively sealed and overlapped with the tops of the outer cylinder 2, the middle cylinder 3, and the inner cylinder 4. The outer cover 20, the middle cover 21, and the inner cover 22 are respectively provided with a circular first through hole, a second through hole, and a third through hole in their centers. A certain gap is left between the outer cover 20 and the middle cover 21, and between the middle cover 21 and the inner cover 22, forming a "┌" shape. The upper cavity layer 18 and lower cavity layer 19 are shaped like a "┐". The middle cover 21 and inner cover 22 are fixedly connected to the outer cover 20 and the middle cover 21 respectively by connecting rods, connecting plates, bolts or brackets. The exhaust pipe 15 passes through the first through hole, the second through hole and the third through hole from top to bottom. The inner wall of the first through hole is slidably sleeved with the outer wall of the exhaust pipe 15. A sealing ring is provided on the inner wall of the first through hole. The diameter of the second through hole and the third through hole is larger than that of the first through hole. The middle cover 21 and the inner cover 22 do not contact the outer wall of the exhaust pipe 15. The upper cavity layer 18 is connected to the lower cavity layer 19 through the second through hole. The lower cavity layer 19 is connected to the inner cavity 11 through the third through hole.

[0025] Specifically, sealing rings are connected to the bottom of the outer cover 20, the middle cover 21, and the inner cover 22, or to the top of the outer cylinder 2, the middle cylinder 3, and the inner cylinder 4.

[0026] Specifically, the shell-and-tube heat exchange core 10 includes a shell, the lower end of one side of the shell is connected to the air inlet pipe 12, and the upper part of the other side is provided with an air outlet hole and connected to the inner cavity 11. The inner cavity of the shell is provided with a plurality of arrayed heat exchange tubes. The two ends of the heat exchange tubes extend to the outside of the shell and are connected to the settling chamber 7 and the flow guide shroud 14 respectively. The heat exchange tubes are not connected to the inner cavity of the shell or the inner cavity 11. The outer wall of the heat exchange tubes is provided with a plurality of fins.

[0027] Specifically, the airflow regulator includes an adjusting sleeve 23 threaded onto the outer wall of the air inlet pipe 12. The outer wall of the air inlet pipe 12 has external threads, and the inner wall of the adjusting sleeve 23 has internal threads that match the external threads on the outer wall of the air inlet pipe 12. The adjusting sleeve 23 slides through the side wall of the outer cylinder 2 and extends into the outer cavity 5, covering the diversion hole 13 on the air inlet pipe 12. Rotating the adjusting sleeve 23 allows it to move along the outer wall of the air inlet pipe 12, thereby controlling the extent to which the adjusting sleeve 23 covers the diversion hole 13. This allows for the control of the airflow entering the outer cavity 5. The outer wall of the adjusting sleeve 23 located outside the outer cylinder 2 is provided with anti-slip texture or rubber anti-slip pad. The outer wall of the adjusting sleeve 23 located inside the outer cylinder 2 is a smooth surface or is provided with a Teflon self-lubricating wear-resistant and corrosion-resistant coating. A sealing ring is provided on the contact surface between the outer cylinder 2 and the outer wall of the adjusting sleeve 23. The outer wall of the air inlet pipe 12 located outside the outer cylinder 2 is provided with axial graduations to facilitate accurate control of the moving distance of the adjusting sleeve 23, thereby accurately controlling the extent of covering the diversion flow hole 13.

[0028] Specifically, a conical guide plate 24 is provided at the connection between the lower cavity layer 19 and the inner cavity layer and the upper cavity layer 18 to separate the inner cavity of the inner cylinder 4 and the upper cavity layer 18, so as to avoid the airflow from the inner cavity layer and the upper cavity layer 18 flowing into the lower cavity layer 19 from colliding and affecting the airflow efficiency.

[0029] Specifically, the air inlet pipe 12 is equipped with a water-absorbing cotton filter at one end outside the outer cylinder 2 to facilitate preliminary drying of the air, and the air outlet pipe 9 is equipped with a temperature sensor on its inner wall to facilitate monitoring of the air outlet temperature.

[0030] The working process of this utility model is as follows: the flue gas generated by the combustion of biomass fuel in the biomass combustion furnace enters the settling chamber 7 through the flue gas inlet pipe 8. The flue gas settles at the bottom of the settling chamber 7. The flue gas enters the guide shroud 14 through the heat exchange tubes on the tubular heat exchange core 10 and is discharged through the exhaust pipe 15. At the same time, cold air enters the tubular heat exchange core 10 through the air inlet pipe 12 for heat exchange. Meanwhile, a portion of the air enters the outer cavity 5 through the diversion holes 13 opened on the pipe wall of the air inlet pipe 12, and then enters the lower cavity 19 through the upper cavity layer 18 inside the cylinder cover 17. The air heated by the tubular heat exchange core 10 enters the inner cavity 11, and then enters the lower cavity 19 to mix with the cold air that entered the lower cavity layer 19 through the upper cavity layer 18 and is heated to form hot air. Then it enters the middle cavity 6 and exits through the air outlet pipe at the bottom of the middle cylinder 3. 9. The camellia fruit is conveyed to the camellia fruit drying device for drying. The energy-saving heat exchanger of this utility model avoids the need for an external insulation layer by setting an outer cavity for circulating cold air on the outer layer of the heat exchanger. This facilitates the isolation of heat from the heat exchanger, increases the safety of the heat exchanger, prevents burns to personnel, and at the same time, can bring the heat lost from the outer layer of the heat exchanger back to the heat exchanger for secondary use, saving energy. By setting a lower cavity layer inside the cylinder cover, it is easy for hot air and cold air to mix fully, which helps to ensure that the temperature of the mixed gas is stable and uniform. By setting an intermediate cavity layer, it is easy to utilize the heat dissipated from the shell and tube heat exchange core and the outer wall of the settling chamber, which helps the outer cavity to better isolate the heat from the heat exchanger. By setting an airflow regulator, it is easy to adjust the ratio of air flow entering the outer cavity and the shell and tube heat exchange core, which helps to adjust the temperature of the mixed gas.

[0031] As an alternative, settling chamber 7 can be replaced with a biomass combustion chamber.

Claims

1. An energy-saving heat exchanger, comprising a base (1), characterized in that: The top of the base (1) is fixedly connected to an outer cylinder (2), a middle cylinder (3), and an inner cylinder (4) that are sequentially nested from the outside to the inside. A certain distance is left between the outer walls of the outer cylinder (2) and the middle cylinder (3), and between the middle cylinder (3) and the inner cylinder (4), forming an outer cavity (5) and a middle cavity (6) sequentially from the outside to the inside. The lower part of the inner cavity of the inner cylinder (4) is a settling chamber (7) and is connected to a smoke inlet pipe (8). The smoke inlet pipe (8) is connected to the settling chamber (7) but not to the outer cavity (5) or the middle cavity (6). The bottom of the middle cylinder (3) An air outlet pipe (9) is connected to the outer cylinder (2), which passes through the outer cylinder (2) and extends to the outside of the outer cylinder (2). The air outlet pipe (9) is connected to the intermediate cavity (6), but not to the inner cavity of the inner cylinder (4) or the outer cavity (5). A tubular heat exchange core (10) is installed on the upper part of the inner cylinder (4). A certain gap is left between the inner wall of the inner cylinder (4) and the outer wall of the tubular heat exchange core (10), forming an inner cavity (11). The inner cavity (11) is not connected to the settling chamber (7). The lower end of one side of the tubular heat exchange core (10) is connected to an inlet valve. The air duct (12) passes through the inner cylinder (4), middle cylinder (3), and outer cylinder (2) in sequence and is connected to the external fan. The air duct (12) is connected to the tube heat exchange core (10). The air duct (12) is connected to the outer cavity (5) through multiple diversion holes (13) opened on the pipe wall. The air duct (12) is not connected to the middle cavity (6) and the inner cavity (11). The air outlet on the upper side of the tube heat exchange core (10) is connected to the inner cavity (11). The top of the tube heat exchange core (10) is connected to a conical guide shroud (1). 4) The top of the guide hood (14) is connected to the exhaust pipe (15). The top of the outer cylinder (2) is fixedly connected to the cylinder cover (17) through the flange (16). The cylinder cover (17) is provided with an upper cavity layer (18) and a lower cavity layer (19) that are connected to the outer cavity (5) and the middle cavity (6) respectively from top to bottom. The top of the inner cylinder (4) and the upper cavity layer (18) are connected to the lower cavity layer (19). The exhaust pipe (15) passes through the cylinder cover (17) and extends to the outside of the cylinder cover (17). The air inlet pipe (12) is provided with an airflow regulator on its outer wall.

2. The energy-saving heat exchanger according to claim 1, characterized in that: The outer cylinder (2), middle cylinder (3), and inner cylinder (4) are arranged concentrically, and the cross-sections of the outer cylinder (2), middle cylinder (3), and inner cylinder (4) are circular, elliptical, rectangular, regular pentagonal, regular hexagonal, or regular octagonal.

3. The energy-saving heat exchanger according to claim 1, characterized in that: The cylinder cover (17) includes an outer cover (20), a middle cover (21), and an inner cover (22) that are sequentially fitted from the outside to the inside. The bottoms of the outer cover (20), the middle cover (21), and the inner cover (22) are respectively sealed and overlapped with the tops of the outer cylinder (2), the middle cylinder (3), and the inner cylinder (4). The outer cover (20), the middle cover (21), and the inner cover (22) are respectively provided with a circular first through hole, a second through hole, and a third through hole in the center. A certain gap is left between the outer cover (20) and the middle cover (21), and between the middle cover (21) and the inner cover (22) to form a "┌" shape. The upper cavity layer (18) and lower cavity layer (19) are shaped like a "┐". The middle cover (21) and inner cover (22) are fixedly connected to the outer cover (20) and middle cover (21) respectively. The exhaust pipe (15) passes through the first through hole, the second through hole and the third through hole from top to bottom. The inner wall of the first through hole is slidably sleeved with the outer wall of the exhaust pipe (15). The diameter of the second through hole and the third through hole is larger than that of the first through hole. The middle cover (21) and inner cover (22) do not contact the outer wall of the exhaust pipe (15). The upper cavity layer (18) is connected to the lower cavity layer (19) through the second through hole. The lower cavity layer (19) is connected to the inner cavity (11) through the third through hole.

4. An energy-saving heat exchanger according to claim 3, characterized in that: A sealing ring is connected to the bottom of the outer cover (20), the middle cover (21), the inner cover (22), or the top of the outer cylinder (2), the middle cylinder (3), the inner cylinder (4).

5. An energy-saving heat exchanger according to claim 1, characterized in that: The tube-type heat exchange core (10) includes a shell. The lower end of one side of the shell is connected to the air inlet pipe (12), and the upper part of the other side has one or more air outlet holes. The inner cavity of the shell is provided with multiple arrayed heat exchange tubes. The two ends of the heat exchange tubes extend to the outside of the shell and are connected to the settling chamber (7) and the guide shroud (14) respectively. The heat exchange tubes are not connected to the inner cavity and inner layer cavity (11) of the shell. The outer wall of the heat exchange tubes is provided with several fins.

6. An energy-saving heat exchanger according to claim 1, characterized in that: The bottom of one side of the settling chamber (7) is provided with an ash outlet. The ash outlet passes through the inner cylinder (4), the middle cylinder (3) and the outer cylinder (2) in sequence and is connected to a silo door. The ash outlet is connected to the settling chamber (7) but not to the outer cavity (5) or the middle cavity (6). The bottom surface of the settling chamber (7) is a downward slope near the ash outlet.

7. An energy-saving heat exchanger according to claim 1, characterized in that: The airflow regulator includes an adjustment sleeve (23) threaded onto the outer wall of the air inlet pipe (12). The adjustment sleeve (23) slides through the side wall of the outer cylinder (2) and extends into the outer cavity (5), covering the diversion hole (13) on the air inlet pipe (12).

8. An energy-saving heat exchanger according to claim 7, characterized in that: The outer wall of the adjusting sleeve (23) located outside the outer cylinder (2) is provided with anti-slip texture or rubber anti-slip pad, and the outer wall of the air inlet pipe (12) located outside the outer cylinder (2) is provided with scale.

9. An energy-saving heat exchanger according to claim 1, characterized in that: The lower cavity (19) is provided with a conical guide plate (24) that separates the inner cavity of the inner cylinder (4) and the upper cavity (18).

10. An energy-saving heat exchanger according to claim 1, characterized in that: The air inlet pipe (12) is equipped with a water-absorbing cotton filter at one end located outside the outer cylinder (2), and a temperature sensor is provided on the inner wall of the air outlet pipe (9).

Images