High-efficiency multi-stage counter-flow heat exchanger

Abstract

The invention discloses a high-efficiency multistage reverse flow type heat exchanger, which belongs to the technical field of heat exchangers and comprises a front cover and a rear cover, a plurality of heat exchange plates are arranged between the front cover and the rear cover, a circulating conveying mechanism is arranged on the other side of the front cover, and connecting mechanisms are arranged on the front side and the rear side of the front cover. One side of the rear cover is provided with a monitoring mechanism and a locking mechanism, the top of the monitoring mechanism is provided with a linkage mechanism, and the bottom of the monitoring mechanism is provided with a compensation mechanism; the monitoring mechanism comprises a sealing box, a sealing plate and a cross rod, and the linkage mechanism comprises a sealing cylinder, a piston disc, a counterweight plate and a touch button. The multi-point temperature sensor is used for accurately monitoring the inlet and outlet temperature difference change of cold and hot fluid, the heat exchange efficiency and the heat loss state are evaluated in real time, when it is detected that the outlet hot fluid temperature exceeds the expectation, the circulating conveying mechanism is immediately activated, and the hot fluid is guided into the circulating loop again for secondary heat exchange.

Description

Technical Field

[0001] This invention relates to the field of heat exchanger technology, and more particularly to a high-efficiency multi-stage counter-flow heat exchanger. Background Technology

[0002] Multistage counter-flow plate heat exchangers are widely used in industrial fields. They utilize multiple layers of spaced-apart plate bundles to form channels for alternating flow of hot and cold fluids, maximizing heat exchange efficiency through a counter-flow mechanism. In traditional structures, hot and cold fluids enter the plate bundles through inlet pipes for heat exchange and then exit through outlet pipes. However, in actual operation, even with a counter-flow design, due to the single-pass heat exchange process, some heat source fluids may still contain considerable residual heat upon exiting, resulting in significant energy waste and economic losses. Furthermore, these devices rely on bolts and other connecting mechanisms to tightly seal the front and rear covers against the internal plate bundles. This static clamping force is easily weakened by long-term thermal expansion, contraction, and vibration, leading to seal failure between the plate bundles and leakage problems. This not only reduces heat exchange efficiency but also introduces safety hazards and maintenance costs.

[0003] In existing technologies, although temperature sensors are used to monitor inlet and outlet temperatures, they are often limited to single-point data and lack the ability to effectively and in real-time assess the overall heat exchange efficiency loss, making it difficult to promptly and accurately identify insufficient heat recovery. In other words, there is a lack of a mechanism that can proactively respond to temperature anomalies and automatically reprocess waste heat. Furthermore, traditional fixing and locking devices generally lack effective operational status monitoring and adaptive compensation methods to ensure the necessary and continuous sealing pressure between the plate bundles. This makes it difficult to dynamically adjust the clamping force during equipment operation to continuously compensate for potential loosening, posing a risk to the reliability of the seal during operation. Therefore, we propose a high-efficiency multi-stage counter-flow heat exchanger to solve this problem. Summary of the Invention

[0004] The purpose of this invention is to provide a high-efficiency multi-stage counter-flow heat exchanger to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A high-efficiency multi-stage counter-current heat exchanger includes: a front cover and a rear cover, with multiple heat exchange plates arranged between the front cover and the rear cover, a circulation conveying mechanism arranged on the other side of the front cover, connecting mechanisms arranged on both the front and rear sides of the front cover, a monitoring mechanism and a locking mechanism arranged on one side of the rear cover, a linkage mechanism arranged on the top of the monitoring mechanism, and a compensation mechanism arranged on the bottom of the monitoring mechanism. The monitoring mechanism includes a sealing box, a sealing plate, and a crossbar; the linkage mechanism includes a sealing cylinder, a piston disc, a counterweight plate, and a touch button.

[0006] Preferably, the sealing cylinder is connected to the top of the sealing box, the piston disc is slidably and sealingly installed inside the sealing cylinder, a connecting rod is fixedly installed between the counterweight plate and the piston disc, a pressure plate is fixedly installed on one side of the counterweight plate, the pressure plate is positioned directly above the touch button, the touch button is fixedly installed on the top of the sealing box, a guide post is fixedly installed on the top of the sealing box, and the counterweight plate is slidably sleeved on the outside of the guide post.

[0007] Preferably, the sealing plate is slidably installed inside the sealing box, a return spring is provided on one side of the sealing plate, the other end of the return spring is connected to the side wall of the sealing box, a fixing plate is fixedly installed inside the sealing box, and the crossbar is slidably installed inside the fixing plate.

[0008] Preferably, the compensation mechanism includes: a mounting plate, an electric push rod, a pressure sensor, a piston plate, and a sealing frame. The piston plate is slidably mounted inside the sealing frame. The pressure sensor is fixedly mounted on the bottom of the piston plate. The electric push rod is fixedly mounted on the mounting plate. The output end of the electric push rod is fixedly connected to the pressure sensor. A connecting pipe connects the sealing frame and the sealing box. A control valve is installed inside the connecting pipe.

[0009] Preferably, the circulating conveying mechanism includes: a conveying frame, a partition, an inlet pipe, and an outlet pipe. The partition is slidably installed inside the conveying frame. The inlet pipe and the outlet pipe are respectively connected to the bottom and top of the conveying frame. A first one-way valve and a second one-way valve are respectively provided inside the inlet pipe and the outlet pipe. Two ear plates are fixedly installed on one side of the partition, and a fixed post is fixedly installed between the two ear plates. Several connecting plates are rotatably sleeved on the outside of the fixed post. Two side plates are fixedly installed on one side of the conveying frame. A rotating shaft is rotatably installed inside the side plate. A rotating arm is fixedly installed at one end of the rotating shaft. The same connecting post is fixedly installed at the other end of the two rotating arms. The other end of the connecting plate is rotatably sleeved on the outside of the connecting post. A conveying motor is fixedly installed on the front side of the conveying frame, and the front end of one of the rotating shafts is fixedly installed on the output shaft of the conveying motor.

[0010] Preferably, the rear side of the front cover is connected to a hot water inlet pipe, a cold water outlet pipe, a cold water inlet pipe, and a hot water outlet pipe. A first temperature sensor, a second temperature sensor, a third temperature sensor, and a fourth temperature sensor are respectively fixedly installed inside the hot water inlet pipe, the cold water outlet pipe, the cold water inlet pipe, and the hot water outlet pipe. The bottom end of the inlet pipe is connected to the hot water outlet pipe, the top end of the outlet pipe is connected to the hot water inlet pipe, a controller is fixedly installed at the bottom of the mounting plate, and the mounting plate is fixedly installed on one side of the rear cover.

[0011] Preferably, the connecting mechanism includes: a first washer, a second washer, a connecting bolt, and a connecting nut. The first washer and the second washer are respectively movably abutted against one side of the front cover and the rear cover. The connecting bolt passes through the first washer and the second washer, and the connecting nut is threaded onto the outside of the connecting bolt.

[0012] Preferably, the locking mechanism includes: a connecting cylinder, a first locking bolt, a second locking bolt, and a locking plate. The connecting cylinder passes through the front cover and the rear cover. The first locking bolt and the second locking bolt are both threaded into the connecting cylinder. The second locking bolt passes through the locking plate. The other end of the crossbar is fixedly connected to the locking plate. The sealing box, the sealing cylinder, and the sealing frame are all filled with liquid.

[0013] The beneficial effects of this invention are as follows: 1. In this invention, the high-efficiency multi-stage counter-current heat exchanger introduces cold water through a cold water inlet pipe, allowing the cold water to flow through multiple heat exchange plates and exit from the cold water outlet pipe. At the same time, hot water is introduced through a hot water inlet pipe into multiple heat exchange plates, where it exchanges heat with the cold water within the heat exchange plates. The hot water and cold water flow in opposite directions, and then the hot water flows out through the hot water outlet pipe. 2. In this invention, the high-efficiency multi-stage counter-current heat exchanger monitors the water flow temperature in the hot water inlet pipe, cold water outlet pipe, cold water inlet pipe, and hot water outlet pipe respectively through a first temperature sensor, a second temperature sensor, a third temperature sensor, and a fourth temperature sensor. The temperature drop of the hot water is determined by calculating the difference between the first temperature sensor and the fourth temperature sensor, and the temperature rise of the cold water is determined by calculating the difference between the second temperature sensor and the third temperature sensor. The heat loss is determined by comparing the temperature drop of the hot water and the temperature rise of the cold water. 3. In this invention, the high-efficiency multi-stage counter-current heat exchanger, when the fourth temperature sensor detects that the temperature is higher than the preset value, starts the conveyor motor to drive one of the rotating shafts to rotate, and drives the connecting shaft to perform circumferential motion through the rotating arm. Then, through the cooperation of the connecting plate, the fixed column, and the ear plate, the partition moves back and forth left and right. When the partition moves to the left, the water in the hot water outlet pipe is sucked into the conveyor frame through the inlet pipe. When the partition moves to the right, the water in the conveyor frame is input into the hot water inlet pipe through the outlet pipe, so that the hot water passes through the heat exchange plates again to achieve heat exchange, thereby realizing the full utilization of the heat in the hot water. 4. In this invention, the high-efficiency multi-stage counter-current heat exchanger uses the cooperation of the sealing plate, crossbar, locking plate, first locking bolt, second locking bolt, and connecting cylinder to press the front and rear covers together, thereby ensuring the sealing of the connection between multiple heat exchange plates. When the pressing force is insufficient and the thrust of the liquid on the piston disc is less than the weight of the piston disc, connecting rod, and counterweight plate, the counterweight plate moves downward under the action of gravity and presses the touch button through the pressure plate, thereby controlling the electric push rod to start and drive the piston plate to move upward. This allows the liquid in the sealing frame to enter the sealing box through the connecting pipe, pressing the sealing plate together, thereby ensuring the pressing effect on the heat exchange plates and preventing leakage. 5. In this invention, the high-efficiency multi-stage counter-current heat exchanger achieves efficient heat exchange of hot and cold fluids through a multi-stage counter-current heat exchange plate design. Its key feature lies in the integration of an intelligent heat monitoring and dynamic compensation mechanism: multi-point temperature sensors are used to accurately monitor the inlet and outlet temperature differences of the hot and cold fluids, and to evaluate the heat exchange efficiency and heat loss status in real time. When the outlet hot fluid temperature exceeds expectations, the circulation conveying mechanism is immediately activated, reintroducing this portion of the hot fluid into the circulation loop for secondary heat exchange, thereby deeply recovering heat energy and significantly reducing waste. By monitoring the clamping force between the heat exchange plates, a hydraulic compensation mechanism is automatically triggered when the pressure is insufficient to enhance the locking and sealing effect, effectively preventing leakage risks caused by seal degradation, ensuring long-term stable operation of the heat exchange process, and overall improving heat exchange efficiency, heat recovery utilization rate, and operational reliability. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the high-efficiency multi-stage counter-flow heat exchanger proposed in this invention. Figure 2 This is a schematic diagram of the first cross-sectional view of the high-efficiency multi-stage counter-flow heat exchanger proposed in this invention. Figure 3 This is a schematic diagram of the second cross-sectional view of the high-efficiency multi-stage counter-flow heat exchanger proposed in this invention. Figure 4 This is a schematic diagram of the third cross-sectional view of the high-efficiency multi-stage counter-flow heat exchanger proposed in this invention. Figure 5 for Figure 3 A magnified view of part A in the middle; Figure 6 for Figure 3 A magnified view of part B in the middle section; Figure 7 This is a three-dimensional structural diagram of the circulating conveying mechanism proposed in this invention; Figure 8 This is a side cross-sectional view of the high-efficiency multi-stage counter-flow heat exchanger proposed in this invention.

[0015] In the diagram: 1. Heat exchange plate; 101. Front cover; 102. Rear cover; 2. Connecting mechanism; 201. Connecting bolt; 202. First gasket; 203. Second gasket; 204. Connecting nut; 3. Circulating conveying mechanism; 301. Conveying frame; 302. Partition plate; 303. Ear plate; 304. Fixed column; 305. Connecting plate; 306. Connecting column; 307. Rotating shaft; 308. Side plate; 309. Conveying motor; 310. Inlet pipe; 311. First one-way valve; 312. Outlet pipe; 313. Second one-way valve; 4. Locking mechanism; 401. Locking plate; 402. Second locking bolt; 403. Connecting cylinder; 404. First locking bolt; 5. Monitoring mechanism; 501. Sealing box; 502. 503. Sealing plate; 504. Return spring; 505. Fixing plate; 506. Crossbar; 607. Linkage mechanism; 608. Counterweight plate; 609. Guide column; 6000. Connecting rod; 6001. Piston disc; 601. Sealing cylinder; 602. Touch button; 603. Pressure plate; 704. Compensation mechanism; 705. Mounting plate; 706. Electric push rod; 707. Pressure sensor; 708. Sealing frame; 709. Piston plate; 7000. Connecting pipe; 701. Control valve; 802. Hot water inlet pipe; 803. First temperature sensor; 904. Cold water inlet pipe; 905. Second temperature sensor; 10. Cold water outlet pipe; 1006. Third temperature sensor; 11. Hot water outlet pipe; 1107. Fourth temperature sensor; 12. Controller. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0017] Reference Figure 1 - Figure 8 A high-efficiency multi-stage counter-current heat exchanger includes: a front cover 101 and a rear cover 102, with multiple heat exchange plates 1 arranged between the front cover 101 and the rear cover 102, a circulation conveying mechanism 3 arranged on the other side of the front cover 101, a connecting mechanism 2 arranged on both the front and rear sides of the front cover 101, a monitoring mechanism 5 and a locking mechanism 4 arranged on one side of the rear cover 102, a linkage mechanism 6 arranged on the top of the monitoring mechanism 5, and a compensation mechanism 7 arranged on the bottom of the monitoring mechanism 5. The monitoring mechanism 5 includes: a sealing box 501, a sealing plate 502, and a crossbar 505. The linkage mechanism 6 includes: a sealing cylinder 605, a piston disc 604, a counterweight plate 601, and a touch button 606.

[0018] In this embodiment, the sealing cylinder 605 is connected to the top of the sealing box 501, the piston disc 604 is slidably sealed inside the sealing cylinder 605, a connecting rod 603 is fixedly installed between the counterweight plate 601 and the piston disc 604, a pressure plate 607 is fixedly installed on one side of the counterweight plate 601, the pressure plate 607 is located directly above the touch button 606, the touch button 606 is fixedly installed on the top of the sealing box 501, a guide post 602 is fixedly installed on the top of the sealing box 501, and the counterweight plate 601 is slidably sleeved on the outside of the guide post 602.

[0019] In this embodiment, the sealing plate 502 is slidably installed inside the sealing box 501. A return spring 503 is provided on one side of the sealing plate 502, and the other end of the return spring 503 is connected to the side wall of the sealing box 501. A fixing plate 504 is fixedly installed inside the sealing box 501, and a crossbar 505 is slidably installed inside the fixing plate 504.

[0020] In this embodiment, the compensation mechanism 7 includes: a mounting plate 701, an electric push rod 702, a pressure sensor 703, a piston plate 705, and a sealing frame 704. The piston plate 705 is slidably mounted inside the sealing frame 704. The pressure sensor 703 is fixedly mounted on the bottom of the piston plate 705. The electric push rod 702 is fixedly mounted on the mounting plate 701. The output end of the electric push rod 702 is fixedly connected to the pressure sensor 703. A connecting pipe 706 connects the sealing frame 704 and the sealing box 501. A control valve 707 is provided inside the connecting pipe 706.

[0021] In this embodiment, the circulating conveying mechanism 3 includes: a conveying frame 301, a partition 302, an inlet pipe 310, and an outlet pipe 312. The partition 302 is slidably installed in the conveying frame 301. The inlet pipe 310 and the outlet pipe 312 are respectively connected to the bottom and top of the conveying frame 301. A first one-way valve 311 and a second one-way valve 313 are respectively provided in the inlet pipe 310 and the outlet pipe 312. Two ear plates 303 are fixedly installed on one side of the partition 302. A fixed post 304 is fixedly installed between the two ear plates 303. Several connecting plates 305 are rotatably sleeved on the outside of the fixed post 304. Two side plates 308 are fixedly installed on one side of the conveyor frame 301. A rotating shaft 307 is rotatably installed inside the side plate 308. A rotating arm is fixedly installed at one end of the rotating shaft 307. The same connecting post 306 is fixedly installed at the other end of the two rotating arms. The other end of the connecting plate 305 is rotatably sleeved on the outside of the connecting post 306. A conveyor motor 309 is fixedly installed on the front side of the conveyor frame 301. The front end of one of the rotating shafts 307 is fixedly installed on the output shaft of the conveyor motor 309.

[0022] In this embodiment, the rear side of the front cover 101 is connected to a hot water inlet pipe 8, a cold water outlet pipe 10, a cold water inlet pipe 9, and a hot water outlet pipe 11. A first temperature sensor 801, a second temperature sensor 901, a third temperature sensor 1001, and a fourth temperature sensor 1101 are respectively fixedly installed inside the hot water inlet pipe 8, the cold water outlet pipe 10, the cold water inlet pipe 9, and the hot water outlet pipe 11. The bottom end of the inlet pipe 310 is connected to the hot water outlet pipe 11, and the top end of the outlet pipe 312 is connected to the hot water inlet pipe 8. A controller 12 is fixedly installed at the bottom of the mounting plate 701, and the mounting plate 701 is fixedly installed on one side of the rear cover 102.

[0023] In this embodiment, the connecting mechanism 2 includes: a first washer 202, a second washer 203, a connecting bolt 201, and a connecting nut 204. The first washer 202 and the second washer 203 are respectively movably abutted against one side of the front cover 101 and the rear cover 102. The connecting bolt 201 passes through the first washer 202 and the second washer 203. The connecting nut 204 is threaded onto the outside of the connecting bolt 201.

[0024] In this embodiment, the locking mechanism 4 includes: a connecting cylinder 403, a first locking bolt 404, a second locking bolt 402, and a locking plate 401. The connecting cylinder 403 passes through the front cover 101 and the rear cover 102. The first locking bolt 404 and the second locking bolt 402 are both threaded into the connecting cylinder 403. The second locking bolt 402 passes through the locking plate 401. The other end of the crossbar 505 is fixedly connected to the locking plate 401. The sealing box 501, the sealing cylinder 605, and the sealing frame 704 are all filled with liquid.

[0025] In this embodiment, during use, cold water is introduced through the cold water inlet pipe 9, flowing through multiple heat exchange plates 1 and exiting from the cold water outlet pipe 10. Simultaneously, hot water is introduced through the hot water inlet pipe 8 into multiple heat exchange plates 1, where it exchanges heat with the cold water within the heat exchange plates 1, with the hot water flowing in the opposite direction to the cold water. Then, the hot water flows out through the hot water outlet pipe 11. The water flow temperature in the hot water inlet pipe 8, cold water outlet pipe 10, cold water inlet pipe 9, and hot water outlet pipe 11 is monitored by the first temperature sensor 801, the second temperature sensor 901, the third temperature sensor 1001, and the fourth temperature sensor 1101, respectively. The temperature drop of the hot water is determined by calculating the difference between the first temperature sensor 801 and the fourth temperature sensor 1101, and the temperature rise of the cold water is determined by calculating the difference between the second temperature sensor 901 and the third temperature sensor 1001. The heat loss is determined by comparing the temperature drop of the hot water and the temperature rise of the cold water. When the fourth temperature sensor 1101 detects that the temperature is higher than the preset value, the conveyor motor 309 is started, driving one of the rotating shafts 307 to rotate. The rotating arm then drives the connecting shaft to rotate in a circular motion. Next, the connecting plate 305, in conjunction with the fixed column 304 and ear plate 303, drives the partition 302 to move back and forth. When the partition 302 moves to the left, water from the hot water outlet pipe 11 is drawn into the conveyor frame 301 through the inlet pipe 310. When the partition 302 moves to the right, water from the conveyor frame 301 is fed into the hot water inlet pipe 8 through the outlet pipe 312. This allows the hot water to pass through the heat exchange plates 1 again for heat exchange, achieving full utilization of the heat in the hot water. The sealing plate 502, crossbar 505, locking plate 401, and first lock... The cooperation of the tightening bolt 404, the second locking bolt 402, and the connecting cylinder 403 achieves the compression of the front cover 101 and the rear cover 102, thereby ensuring the sealing of the connection between the multiple heat exchange plates 1. When the compression force is insufficient, causing the liquid to push the piston disc 604 less than the weight of the piston disc 604, the connecting rod 603, and the counterweight plate 601, the counterweight plate 601 moves downward under the action of gravity and presses the touch button 606 through the pressure plate 607, thereby controlling the electric push rod 702 to start, driving the piston plate 705 to move upward, so that the liquid in the sealing frame 704 enters the sealing box 501 through the connecting pipe 706, compressing the sealing plate 502, thereby ensuring the compression effect of the heat exchange plates 1 and preventing leakage.

[0026] The high-efficiency multi-stage counter-flow heat exchanger provided by this invention has been described in detail above. Specific embodiments have been used to illustrate the principles and implementation methods of this invention. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A high-efficiency multi-stage counter-current heat exchanger, characterized in that, include: A front cover (101) and a rear cover (102) are provided, with multiple heat exchange plates (1) between the front cover (101) and the rear cover (102). A circulation conveying mechanism (3) is provided on the other side of the front cover (101). A connecting mechanism (2) is provided on both the front and rear sides of the front cover (101). A monitoring mechanism (5) and a locking mechanism (4) are provided on one side of the rear cover (102). A linkage mechanism (6) is provided on the top of the monitoring mechanism (5). A compensation mechanism (7) is provided on the bottom of the monitoring mechanism (5). The monitoring mechanism (5) includes a sealing box (501), a sealing plate (502) and a crossbar (505), and the linkage mechanism (6) includes a sealing cylinder (605), a piston disc (604), a counterweight plate (601) and a touch button (606).

2. The high-efficiency multi-stage counter-current heat exchanger according to claim 1, characterized in that, The sealing cylinder (605) is connected to the top of the sealing box (501). The piston disc (604) is slidably and sealingly installed inside the sealing cylinder (605). A connecting rod (603) is fixedly installed between the counterweight plate (601) and the piston disc (604). A pressure plate (607) is fixedly installed on one side of the counterweight plate (601). The pressure plate (607) is located directly above the touch button (606). The touch button (606) is fixedly installed on the top of the sealing box (501). A guide post (602) is fixedly installed on the top of the sealing box (501). The counterweight plate (601) is slidably sleeved on the outside of the guide post (602).

3. The high-efficiency multi-stage counter-current heat exchanger according to claim 1, characterized in that, The sealing plate (502) is slidably installed inside the sealing box (501). A return spring (503) is provided on one side of the sealing plate (502). The other end of the return spring (503) is connected to the side wall of the sealing box (501). A fixing plate (504) is fixedly installed inside the sealing box (501). The crossbar (505) is slidably installed inside the fixing plate (504).

4. The high-efficiency multi-stage counter-current heat exchanger according to claim 1, characterized in that, The compensation mechanism (7) includes: a mounting plate (701), an electric push rod (702), a pressure sensor (703), a piston plate (705), and a sealing frame (704). The piston plate (705) is slidably mounted in the sealing frame (704). The pressure sensor (703) is fixedly mounted on the bottom of the piston plate (705). The electric push rod (702) is fixedly mounted on the mounting plate (701). The output end of the electric push rod (702) is fixedly connected to the pressure sensor (703). A connecting pipe (706) connects the sealing frame (704) and the sealing box (501). A control valve (707) is provided inside the connecting pipe (706).

5. The high-efficiency multi-stage counter-current heat exchanger according to claim 1, characterized in that, The circulating conveying mechanism (3) includes: a conveying frame (301), a partition (302), an inlet pipe (310), and an outlet pipe (312). The partition (302) is slidably installed in the conveying frame (301). The inlet pipe (310) and the outlet pipe (312) are respectively connected to the bottom and top of the conveying frame (301). A first one-way valve (311) and a second one-way valve (313) are respectively provided in the inlet pipe (310) and the outlet pipe (312). Two ear plates (303) are fixedly installed on one side of the partition (302), and a fixed column (304) is fixedly installed between the two ear plates (303). Several connecting plates (305) are rotatably sleeved on the outside of the fixed column (304). Two side plates (308) are fixedly installed on one side of the conveying frame (301). A rotating shaft (307) is rotatably installed inside the side plate (308). A rotating arm is fixedly installed at one end of the rotating shaft (307), and the same connecting column (306) is fixedly installed at the other end of the two rotating arms. The other end of the connecting plate (305) is rotatably sleeved on the outside of the connecting column (306). A conveying motor (309) is fixedly installed on the front side of the conveying frame (301), and the front end of one of the rotating shafts (307) is fixedly installed on the output shaft of the conveying motor (309).

6. The high-efficiency multi-stage counter-current heat exchanger according to claim 1, characterized in that, The rear side of the front cover (101) is connected to a hot water inlet pipe (8), a cold water outlet pipe (10), a cold water inlet pipe (9), and a hot water outlet pipe (11). A first temperature sensor (801), a second temperature sensor (901), a third temperature sensor (1001), and a fourth temperature sensor (1101) are respectively fixedly installed in the hot water inlet pipe (8), the cold water outlet pipe (10), the cold water inlet pipe (9), and the hot water outlet pipe (11). The bottom end of the inlet pipe (310) is connected to the hot water outlet pipe (11), and the top end of the outlet pipe (312) is connected to the hot water inlet pipe (8). A controller (12) is fixedly installed at the bottom of the mounting plate (701), and the mounting plate (701) is fixedly installed on one side of the rear cover (102).

7. The high-efficiency multi-stage counter-current heat exchanger according to claim 1, characterized in that, The connecting mechanism (2) includes: a first washer (202), a second washer (203), a connecting bolt (201), and a connecting nut (204). The first washer (202) and the second washer (203) are respectively movably abutted against one side of the front cover (101) and the rear cover (102). The connecting bolt (201) passes through the first washer (202) and the second washer (203). The connecting nut (204) is threaded onto the outside of the connecting bolt (201).

8. The high-efficiency multi-stage counter-flow heat exchanger according to claim 1, characterized in that, The locking mechanism (4) includes: a connecting cylinder (403), a first locking bolt (404), a second locking bolt (402), and a locking plate (401). The connecting cylinder (403) passes through the front cover (101) and the rear cover (102). The first locking bolt (404) and the second locking bolt (402) are both threaded into the connecting cylinder (403). The second locking bolt (402) passes through the locking plate (401). The other end of the crossbar (505) is fixedly connected to the locking plate (401). The sealing box (501), the sealing cylinder (605), and the sealing frame (704) are all filled with liquid.

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