Energy-saving heat exchanger

Abstract

The application discloses an energy-saving heat exchanger and belongs to the technical field of heat exchange equipment. The energy-saving heat exchanger comprises a shell, upper and lower end sleeves are respectively arranged at two ends of the shell, and a heat conduction pipe is arranged in the shell. A low-temperature fluid input port and a low-temperature fluid output port are arranged on the shell. Steam input ports and steam output ports are respectively arranged on the upper and lower end sleeves. A spiral propeller driven by fluid impact force drives a drain pipe to rotate, the drain pipe drives a scraper to rotate, the scraper pushes condensate water adhered to the inner wall of the heat conduction pipe, the condensate water on the inner wall of the heat conduction pipe is gathered together to form water drops with a larger volume, the water drops flow along the side wall of the scraper to the flow guide groove under the action of gravity of the water drops, the water drops flow to the drain pipe along the flow guide groove arranged in a slope, and then the water drops are discharged into a space below a partition plate in the lower end sleeve through the drain pipe. The energy-saving heat exchanger accelerates the transfer rate of the condensate water on the inner wall of the heat conduction pipe, increases the contact probability of steam and the heat conduction pipe, and improves the heat exchange effect.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchange equipment, and more particularly to an energy-saving heat exchanger. Background Art

[0002] A heat exchanger is a device that transfers part of the heat of a hot fluid to a cold fluid. It is also called a heat exchanger. Heat exchangers play an important role in chemical, petroleum, power, food and many other industrial production.

[0003] Since steam releases latent heat during the condensation process (e.g., 100°C water vapor → liquid water, releasing about 2257 kJ / kg), which is much higher than hot water releasing only sensible heat (100°C → 90°C, releasing only about 42 kJ / kg), steam is usually used for heat exchange in heat exchangers.

[0004] In the food industry, heat exchangers are commonly used in pasteurization (heating) or cooling processes. Taking cooling as an example, a high-temperature fluid (such as hot material) typically flows through the tube side of the heat exchanger, while a low-temperature cooling medium (such as cold water) flows through the shell side for heat exchange.

[0005] When steam heating is used (e.g., for pasteurization), high-temperature steam condenses within the tubes, releasing heat. The condensate forms a liquid film that adheres to the tube walls. If too much condensate remains, the heat transfer coefficient may decrease, requiring more high-temperature steam for heat exchange. This results in lower overall heat transfer efficiency and lower energy utilization for the steam heat exchanger.

[0006] Therefore, an energy-saving heat exchanger is proposed. Summary of the Invention

[0007] In view of the problems existing in the prior art, the object of the present invention is to provide an energy-saving heat exchanger that can transfer condensed water in a timely manner and improve the utilization rate of steam.

[0008] To solve the above problems, the present invention adopts the following technical solutions.

[0009] An energy-saving heat exchanger comprises a shell, wherein both ends of the shell are respectively provided with an upper end sleeve and a lower end sleeve, and a heat conducting pipe is installed in the shell;

[0010] The shell is provided with a low-temperature fluid input port and a low-temperature fluid output port; the upper end sleeve and the lower end sleeve are respectively provided with a steam input port and a steam output port; a partition is fixedly installed horizontally in the lower end sleeve, and an extension pipe extending to the top wall of the partition is inserted into the steam output port; a condensate output port is opened on the bottom wall of the lower end sleeve;

[0011] A drainage pipe with a top end passing through the heat conducting pipe is inserted on the bottom wall of the partition;

[0012] Crossbars are evenly inserted on the inner wall of the drainage pipe. The ends of the crossbars are arc-shaped surfaces that fit the inner wall of the heat conduction pipe. A guide groove that passes through the crossbar is opened on the top wall of the crossbar. A scraper that fits the inner wall of the heat conduction pipe is installed in the guide groove. A rotating mechanism that drives the scraper to rotate is provided in the heat conduction pipe.

[0013] A cylindrical piston plate is evenly slidably installed in the drain pipe, and a connecting rod is installed between two adjacent piston plates; through holes are evenly opened on the piston plates, and a driving mechanism is provided on the drain pipe to drive the piston plate to move up and down along the heat conduction pipe.

[0014] Furthermore, the rotating mechanism includes a propeller fixedly mounted on the drain pipe, the propeller is located at the bottom end of the heat conducting pipe, and the drain pipe is vertically rotated and inserted on the partition.

[0015] Furthermore, the driving mechanism includes a reciprocating screw vertically fixedly mounted on the top wall of the drain pipe, a slider is threadedly mounted on the reciprocating screw, a guide rod is vertically fixedly mounted on the inner top wall of the upper end sleeve, and the slider is slidably sleeved on the guide rod;

[0016] An active magnet is fixedly mounted on the slider, and a driven magnet is fixedly mounted on the uppermost piston plate. The active magnet and the driven magnet repel each other, and an elastic member is installed between the top wall of the drain pipe and the uppermost piston plate.

[0017] Furthermore, the elastic member is a bellows made of metal material, a spring is fixedly installed in the bellows, and the exhaust valve and the intake valve are respectively embedded on the side wall and the bottom wall of the bellows.

[0018] Furthermore, an air pipe is vertically embedded in the multiple piston plates and the connecting rod. The top end of the air pipe is connected to the input end of the air intake valve, and the bottom end of the air pipe is connected to the drain pipe.

[0019] Furthermore, the bellows is made of stainless steel.

[0020] Furthermore, a guide tube with the output end facing downward is fixedly mounted on the output end of the exhaust valve.

[0021] Furthermore, a sealing plate is installed between the side wall of the scraper and the side wall of the drain pipe, and the sealing plate covers the surface of the guide groove.

[0022] Furthermore, the outer wall of the piston plate fits the inner wall of the drain pipe.

[0023] Furthermore, the outer wall of the scraper is a mirror surface.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) In this scheme, the gas discharged from the heat pipe will impact the propeller through the mutual cooperation of the drain pipe, the cross bar, the rotating mechanism and the scraper. The propeller affected by the impact of the fluid will drive the drain pipe to rotate. The drain pipe will drive the scraper to rotate through the cross bar. The scraper in contact with the inner wall of the heat pipe pushes the condensed water attached to the inner wall of the heat pipe, so that the condensed water on the inner wall of the heat pipe gathers together to form larger water droplets. Under the action of the water droplets' own gravity, the water droplets gradually flow along the side wall of the scraper into the guide groove, and flow along the inclined guide groove into the drain pipe, and then are discharged into the space below the partition in the lower end sleeve through the drain pipe, which accelerates the transfer rate of the condensed water on the inner wall of the heat pipe, increases the probability of direct contact between the steam and the heat pipe, and improves the heat exchange effect.

[0026] (2) This solution uses the mutual cooperation of the driving mechanism and the piston plate. When the condensed water flows into the drain pipe, the piston plate located at the top performs up and down reciprocating motion in the drain pipe under the action of the driving mechanism. At this time, with the cooperation of the connecting rod, multiple piston plates move synchronously, thereby exerting a downward thrust on the condensed water in the drain pipe, accelerating the discharge rate of the condensed water in the drain pipe, reducing the probability of the condensed water coming into contact with high-temperature steam again, and improving the utilization rate of the steam.

[0027] When condensed water on the inner wall of the heat pipe is promptly removed, the steam inside can directly contact the pipe, improving the steam's heating effect on the pipe. Condensed water adheres to the pipe wall, forming a liquid film insulation layer, significantly reducing the heat transfer coefficient. Timely drainage maintains direct contact between the metal pipe wall and the steam, improving heat exchange efficiency, thereby reducing steam consumption and achieving energy conservation.

[0028] (3) In this solution, the bellows is in an intermittent expansion and contraction state during the upward and downward movement of the driven magnet through the mutual cooperation of the elastic part, the air inlet valve and the air exhaust valve; when the bellows contracts, the gas in the bellows is discharged through the air exhaust valve. At this time, the drain pipe is in a high-pressure state, thereby preventing the high-temperature gas in the heat pipe from passing through the guide groove into the drain pipe and contacting the condensed water; when the bellows extends, the bellows inhales air from the space where the bottom wall of the piston plate at the bottom of the drain pipe is located through the air inlet valve and the air pipe, so that the condensed water above the bottom end of the air pipe in the drain pipe is attracted downward, which speeds up the discharge of condensed water from the drain pipe and reduces the probability of contact between condensed water and steam. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 This is a front cross-sectional structural diagram of the present invention;

[0031] Figure 3 For the present invention Figure 2Schematic diagram of the enlarged structure at A in the middle;

[0032] Figure 4 For the present invention Figure 2 Schematic diagram of the enlarged structure at B in the middle;

[0033] Figure 5 This is a schematic diagram of the cross-sectional structure of the combination of the heat conducting pipe and the drain pipe of the present invention;

[0034] Figure 6 is a schematic cross-sectional structural diagram of the elastic member of the present invention;

[0035] Figure 7 It is a structural schematic diagram of the piston plate of the present invention.

[0036] Description of the numbers in the figure:

[0037] 1. Shell; 2. Upper end sleeve; 3. Lower end sleeve; 4. Heat pipe; 5. Low-temperature fluid inlet; 6. Low-temperature fluid outlet; 7. Steam inlet; 8. Steam outlet; 9. Partition; 10. Extension pipe; 11. Condensate outlet; 12. Drain pipe; 13. Cross bar; 14. Guide groove; 15. Scraper; 16. Piston plate; 17. Connecting rod; 18. Through hole; 19. Propeller; 20. Reciprocating screw; 21. Slider; 22. Guide rod; 23. Active magnet; 24. Driven magnet; 25. Elastic part; 26. Sealing plate; 27. Spring; 28. Exhaust valve; 29. ​​Inlet valve; 30. Air pipe; 31. Guide pipe. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0039] Example 1:

[0040] See also Figures 1 to 7 An energy-saving heat exchanger includes a cylindrical shell 1, with an upper end sleeve 2 and a lower end sleeve 3 respectively sleeved at both ends of the shell 1. A heat pipe 4 is fixedly installed in the shell 1, with both ends passing through the top wall and the bottom wall of the shell 1. The two ends of the heat pipe 4 are connected to the upper end sleeve 2 and the lower end sleeve 3 respectively;

[0041] Among them, the upper end sleeve 2 and the lower end sleeve 3 are respectively located at the top and bottom ends of the shell 1;

[0042] The side walls of the housing 1 are provided with a low-temperature fluid input port 5 and a low-temperature fluid output port 6;

[0043] When the housing 1 is placed vertically, that is, the upper end sleeve 2 is located above the lower end sleeve 3, the low-temperature fluid input port 5 is located below the low-temperature fluid output port 6;

[0044] The upper end sleeve 2 and the lower end sleeve 3 are respectively provided with a steam input port 7 and a steam output port 8;

[0045] A partition 9 is fixedly installed horizontally in the lower end sleeve 3, and an extension pipe 10 is fixedly inserted into the steam outlet 8, the top end of which extends to the top wall of the partition 9; a condensate outlet 11 is opened on the bottom wall of the lower end sleeve 3;

[0046] A drainage pipe 12 is inserted into the bottom wall of the partition 9, the top end of which passes through the heat conducting pipe 4, and the top end of the drainage pipe 12 is sealed;

[0047] The drain pipe 12 is provided with a cross bar 13 having one end extending to the inner wall of the heat-conducting pipe 4. The end of the cross bar 13 that contacts the inner wall of the heat-conducting pipe 4 is an arc surface that fits the inner wall of the heat-conducting pipe 4. The top wall of the cross bar 13 is provided with a guide groove 14 that passes through the cross bar 13. Therefore, the guide groove 14 connects the drain pipe 12 with the heat-conducting pipe 4. The guide groove 14 is arranged at an angle, and the difference between the height of the guide groove 14 away from one end of the drain pipe 12 and the height of the guide groove 14 at one end of the drain pipe 12 is positive. Therefore, the condensed water entering the guide groove 14 will automatically flow into the drain pipe 12 along the guide groove 14. A scraper 15 that cooperates with the inner wall of the heat-conducting pipe 4 is fixedly installed in the guide groove 14. The side wall of the scraper 15 fits the inner wall of the heat-conducting pipe 4; the outer wall of the scraper 15 is a mirror surface, which can reduce the resistance encountered by the condensed water when flowing downward, ensuring that the condensed water can flow into the guide groove 14 in time.

[0048] A rotating mechanism is provided in the heat conducting tube 4 to drive the scraper 15 to rotate;

[0049] A cylindrical piston plate 16 is evenly and slidingly installed in the drain pipe 12, and the ratio of the thickness of the piston plate 16 to the height of the guide groove 14 is 0.1-0.3. Therefore, during the movement of the piston plate 16, the condensed water in the guide groove 14 can flow normally into the drain pipe 12. A connecting rod 17 is commonly installed between two adjacent piston plates 16. Under the action of the connecting rod 17, multiple piston plates 16 can be connected into a whole. Therefore, when the piston plate 16 moves up and down in the drain pipe 12, it will not tilt or get stuck in the drain pipe 12. The ratio of the diameter of the piston plate 16 to the diameter of the connecting rod 17 is 8-10. Therefore, the diameter of the connecting rod 17 is smaller than the diameter of the piston plate 16, ensuring that the condensed water can flow normally in the drain pipe 12; through holes 18 are evenly opened on the piston plate 16, so the condensed water above the piston plate 16 can flow downward through the through holes 18, and the drain pipe 12 is provided with a driving mechanism for driving the piston plate 16 to make up and down reciprocating motion along the heat pipe 4.

[0050] The distance between two adjacent piston plates 16 is the same as the distance between two adjacent cross bars 13 , and the uppermost piston plate 16 is always located below the uppermost cross bar 13 .

[0051] The rotating mechanism includes a propeller 19 fixedly mounted on the drain pipe 12 . The propeller 19 is located at the bottom end of the heat conducting pipe 4 , and the drain pipe 12 is vertically rotated and inserted on the partition 9 .

[0052] The propeller 19 rotates around the shaft when it is impacted by the fluid, which is a prior art and will not be described in detail.

[0053] During operation, low-temperature fluid is injected into the space between the shell 1 and the outer wall of the heat pipe 4 through the low-temperature fluid inlet, and high-temperature steam is input into the upper end sleeve 2 through the steam inlet 7, and then gradually fills the heat pipe 4. At this time, heat exchange occurs between the high-temperature steam in the heat pipe 4 and the low-temperature fluid in the shell 1, thereby achieving a heat exchange effect. In addition, the condensed water generated in the heat pipe 4 during the heat exchange process flows downward along the inner wall of the heat pipe 4 under its own gravity. Finally, the condensed water in the heat pipe 4 is discharged through the condensed water outlet 11, and the gas in the heat pipe 4 is discharged through the bottom end of the heat pipe 4, and then discharged through the extension pipe 10 and the steam outlet 8.

[0054] When the heat pipe 4 is venting, the gas discharged from the heat pipe 4 will impact the propeller 19. The propeller 19 subjected to the impact force of the fluid will drive the drain pipe 12 to rotate. Therefore, the drain pipe 12 will drive the scraper 15 to rotate through the cross bar 13. The scraper 15, which is in contact with the inner wall of the heat pipe 4, pushes the condensed water attached to the inner wall of the heat pipe 4, so that the condensed water on the inner wall of the heat pipe 4 gathers together to form larger water droplets. Since the larger water droplets are heavier, under the action of the water droplets' own gravity, the water droplets gradually flow along the side walls of the scraper 15 into the guide groove 14, and flow along the inclined guide groove 14 into the drain pipe 12, and then are discharged through the drain pipe 12 to the space below the partition 9 in the lower end sleeve 3, and finally discharged through the condensed water outlet 11.

[0055] When the condensed water flows into the drain pipe 12, under the action of the driving mechanism, the piston plate 16 located at the top makes a reciprocating motion up and down in the drain pipe 12. At this time, with the cooperation of the connecting rod 17, multiple piston plates 16 move synchronously, thereby exerting a downward thrust on the condensed water in the drain pipe 12, thereby accelerating the discharge rate of the condensed water in the drain pipe 12, reducing the probability of the condensed water coming into contact with high-temperature steam again, and improving the utilization rate of the steam.

[0056] Once the condensed water on the inner wall of heat pipe 4 is promptly removed, the steam inside can directly contact the heat pipe 4, improving the steam's heating effect on the heat pipe 4. The condensed water adheres to the pipe wall, forming a liquid film insulation layer, significantly reducing the heat transfer coefficient. Timely drainage maintains direct contact between the metal pipe wall and the steam, improving heat exchange efficiency, thereby reducing steam consumption and achieving energy conservation.

[0057] At the same time, the rotating crossbar 13 stirs the steam in the heat pipe 4, thereby increasing the probability of direct contact between the steam and the inner wall of the heat pipe 4, improving the heat exchange effect, and further reducing the steam consumption, thereby achieving energy-saving effect.

[0058] like Figure 2 、 Figure 4 As shown, the driving mechanism includes a reciprocating screw 20 vertically fixedly mounted on the top wall of the drain pipe 12, a slider 21 is threadedly mounted on the reciprocating screw 20, a guide rod 22 is vertically fixedly mounted on the inner top wall of the upper end sleeve 2, and the slider 21 is slidably sleeved on the guide rod 22;

[0059] During the process of the reciprocating screw 20 being driven by the drain pipe 12 to rotate, the guide rod 22 limits the rotation of the slider 21, so that the slider 21 can reciprocate up and down along the reciprocating screw 20. This is a prior art and will not be described in detail.

[0060] An active magnet 23 is fixedly mounted on the slider 21 , and a driven magnet 24 is fixedly mounted on the top piston plate 16 . The active magnet 23 and the driven magnet 24 repel each other, and an elastic member 25 is installed between the top wall of the drain pipe 12 and the top piston plate 16 .

[0061] During the up and down movement of the slider 21 , the slider 21 drives the active magnet 23 to intermittently approach the driven magnet 24 ; when the active magnet 23 moves away from the driven magnet 24 , under the action of the elastic member 25 , each piston plate 16 is located at the highest point.

[0062] When the active magnet 23 moves downward and approaches the driven magnet 24, the repulsive force on the driven magnet 24 gradually increases, and the repulsive force on the driven magnet 24 is greater than the elastic force of the elastic member 25. Therefore, the driven magnet 24 will drive the piston plate 16 to move downward, thereby driving the piston plate 16 to move, and under the action of the connecting rod 17, multiple piston plates 16 move synchronously.

[0063] like Figure 6As shown, elastic member 25 is a metal bellows made of stainless steel. Because stainless steel's surface is less susceptible to bacterial growth, using stainless steel to manufacture bellows improves food safety. A spring 27 is fixedly mounted within the bellows, with its ends fixedly connected to the top and bottom walls of the bellows, respectively. Spring 27 provides elasticity. An exhaust valve 28 and an intake valve 29 are embedded in the side and bottom walls of the bellows, respectively.

[0064] The output end of the exhaust valve 28 is connected to the drain pipe 12 .

[0065] An air pipe 30 is vertically embedded on multiple piston plates 16 and connecting rods 17. The top end of the air pipe 30 is connected to the input end of the air intake valve 29, and the bottom end of the air pipe 30 is connected to the drain pipe 12. The bottom end of the air pipe 30 is located on the bottom wall of the lowest piston plate 16.

[0066] During the up and down movement of the driven magnet 24, the bellows is in an intermittent expansion and contraction state; when the bellows contracts, the gas in the bellows is discharged through the exhaust valve 28. At this time, the drain pipe 12 is in a high-pressure state, thereby preventing the high-temperature gas in the heat pipe 4 from passing through the guide groove 14 into the drain pipe 12 and contacting the condensed water.

[0067] When the bellows stretches, the bellows draws air from the space at the bottom wall of the lowest piston plate 16 in the drain pipe 12 through the air inlet valve 29 and the air pipe 30, so that the condensed water in the drain pipe 12 above the bottom end of the air pipe 30 is attracted downward, which speeds up the discharge of condensed water from the drain pipe 12 and reduces the probability of contact between condensed water and steam.

[0068] like Figure 3 、 Figure 6 As shown, a guide pipe 31 with the output end facing downward is fixedly installed on the output end of the exhaust valve 28.

[0069] By providing the guide tube 31, the direction of the exhaust gas in the exhaust valve 28 can be changed, thereby ensuring that the gas discharged from the bellows can spread downward, increasing the downward impact force on the condensed water on the inner wall of the drain pipe 12, and improving the transfer efficiency of the condensed water.

[0070] like Figure 3 、 Figure 5 As shown, a sealing plate 26 is installed between the side wall of the scraper 15 close to the drain pipe 12 and the side wall of the drain pipe 12. At this time, water droplets flowing along the scraper 15 can still flow into the guide groove 14. The sealing plate 26 covers the surface of the guide groove 14. Since the hot steam flows from top to bottom and the guide groove 14 opens upward, the sealing plate 26 can prevent the steam from directly contacting the condensed water in the guide groove 14, thereby further improving the utilization rate of the steam heat.

[0071] like Figure 3 As shown, the outer wall of the piston plate 16 fits against the inner wall of the drain pipe 12 , thereby improving the scraping effect on the condensed water attached to the inner wall of the drain pipe 12 .

[0072] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any person skilled in the art who, within the technical scope disclosed by the present invention, makes equivalent substitutions or modifications based on the technical solutions and improved concepts of the present invention shall be covered by the scope of protection of the present invention.

Claims

1. An energy-saving heat exchanger, comprising a shell (1), wherein an upper end sleeve (2) and a lower end sleeve (3) are respectively sleeved at both ends of the shell (1), and a heat pipe (4) is installed in the shell (1); Its characteristics are: The shell (1) is provided with a low-temperature fluid input port (5) and a low-temperature fluid output port (6); the upper end sleeve (2) and the lower end sleeve (3) are respectively provided with a steam input port (7) and a steam output port (8); a partition (9) is fixedly installed horizontally in the lower end sleeve (3), and an extension pipe (10) extending to the top wall of the partition (9) is inserted into the steam output port (8); a condensate output port (11) is provided on the bottom wall of the lower end sleeve (3); A drainage pipe (12) with a top end penetrating the heat conducting pipe (4) is inserted into the bottom wall of the partition (9); A cross bar (13) is evenly inserted on the inner wall of the drainage pipe (12), and the end of the cross bar (13) is an arc surface that fits the inner wall of the heat conduction pipe (4). A guide groove (14) that passes through the cross bar (13) is opened on the top wall of the cross bar (13), and a scraper (15) that matches the inner wall of the heat conduction pipe (4) is installed in the guide groove (14); a rotating mechanism for driving the scraper (15) to rotate is provided in the heat conduction pipe (4); a cylindrical piston plate (16) is evenly and slidably installed in the drainage pipe (12) ), a connecting rod (17) is commonly installed between two adjacent piston plates (16); through holes (18) are evenly opened on the piston plates (16), and a driving mechanism for driving the piston plates (16) to make up and down reciprocating motions along the heat conducting pipe (4) is provided on the drain pipe (12); the rotating mechanism includes a propeller (19) fixedly mounted on the drain pipe (12), the propeller (19) is located at the bottom end of the heat conducting pipe (4), and the drain pipe (12) is vertically rotated and inserted on the partition (9); The driving mechanism comprises a reciprocating screw (20) vertically fixedly mounted on the top wall of the drain pipe (12), a slider (21) being threadedly mounted on the reciprocating screw (20), a guide rod (22) being vertically fixedly mounted on the inner top wall of the upper end sleeve (2), and the slider (21) being slidably sleeved on the guide rod (22); An active magnet (23) is fixedly mounted on the slider (21), and a driven magnet (24) is fixedly mounted on the piston plate (16) located at the top. The active magnet (23) and the driven magnet (24) repel each other, and an elastic member (25) is installed between the top wall of the drain pipe (12) and the top piston plate (16).

2. The energy-saving heat exchanger according to claim 1, characterized in that: The elastic member (25) is a bellows made of metal, a spring (27) is fixedly installed in the bellows, and an exhaust valve (28) and an intake valve (29) are respectively embedded on the side wall and bottom wall of the bellows.

3. The energy-saving heat exchanger according to claim 2, characterized in that: An air pipe (30) is vertically embedded on the plurality of piston plates (16) and the connecting rod (17). The top end of the air pipe (30) is connected to the input end of the air inlet valve (29), and the bottom end of the air pipe (30) is connected to the drain pipe (12).

4. The energy-saving heat exchanger according to claim 3, characterized in that: The bellows is made of stainless steel.

5. The energy-saving heat exchanger according to claim 4, characterized in that: A guide tube (31) with the output end facing downward is fixedly mounted on the output end of the exhaust valve (28).

6. The energy-saving heat exchanger according to claim 1, characterized in that: A sealing plate (26) is installed between the side wall of the scraper (15) and the side wall of the drain pipe (12), and the sealing plate (26) covers the surface of the guide groove (14).

7. The energy-saving heat exchanger according to claim 1, characterized in that: The outer wall of the piston plate (16) is in contact with the inner wall of the drain pipe (12).

8. The energy-saving heat exchanger according to claim 1, characterized in that: The outer wall of the scraper (15) is a mirror surface.

Images