Tube nest-winding tube partition coupling type heat exchanger and gradient tube distribution method thereof

Abstract

The invention belongs to the technical field of heat exchangers, and particularly relates to a tube nest-winding tube partition coupling type heat exchanger and a gradient tube distribution method thereof.The tube nest-winding tube partition coupling type heat exchanger comprises a tube shell, end sockets are installed at the two ends of the tube shell, and spiral heat exchange tubes are installed in the tube shell; small blades are mounted at the end parts of the spiral heat exchange tubes; a steel wire is wound on the spiral heat exchange tube and is connected to the rotating ring; a central rod is mounted in the tube shell, the central rod is positioned in the middle of each group of spiral heat exchange tubes, two ends of the central rod are rotationally mounted on the tube plate, a large blade is mounted at one end of the central rod, and the large blade is positioned in a space defined by the end socket, the tube plate and the tube shell; an impeller is mounted on the center rod and is a centrifugal impeller; the heat exchanger is simple in structure, the multiple sets of spiral heat exchange pipes are arranged in the pipe shell and surround the impeller in the middle of the pipe shell, dirt on the surfaces of the heat exchange pipes is cleaned through the steel wire ropes, heat exchange is promoted, and the heat exchange effect is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of heat exchangers, and in particular to a tube-wrapped tube partition coupling type heat exchanger and a gradient tube arrangement method thereof. Background Art

[0002] The spiral threaded tube heat exchanger is a new type of high-efficiency and energy-saving heat exchange equipment. Its design has completely broken through the design concept of traditional shell and tube heat exchangers. Compared with traditional shell and tube heat exchangers, there are significant changes in material selection, structural form, and external volume. A number of technological innovations have made this heat exchanger significantly surpass traditional shell and tube heat exchangers in terms of appearance and performance, changing the characteristics of traditional heat exchangers such as simple structure, large volume, rough appearance and low efficiency. It is an updated product of traditional heat exchangers.

[0003] The shell and tube heat exchanger includes a shell, with tube sheets installed on both sides of the shell, and the shell is located on the outside of the tube sheets and sealed by a head. A tube column parallel to the axis of the shell is installed in the shell, and both ends of the tube column are supported on the tube sheets. The shell has a tube side inlet, a shell side outlet, a tube side outlet, and a shell side inlet at both ends.

[0004] However, the tube-side distance of the existing shell-and-tube heat exchanger is equal to the shell-side distance. Since the axial length of the shell is limited by the size of the installation space, it should not be too long, that is, the shell-side distance is short, which directly leads to a short tube-side distance, short heat exchange time, and poor heat exchange effect of the shell-and-tube heat exchanger. At the same time, after the heat exchanger is used for a long time, dirt will form on the threaded tube. If it is not cleaned and removed, the heat exchange efficiency of the heat exchanger will be reduced and cleaning will be inconvenient. Summary of the invention

[0005] In order to make up for the shortcomings of the prior art, a plurality of groups of spiral heat exchange tubes are arranged in the tube shell to surround the impeller in the middle position of the tube shell to promote heat exchange and improve the heat exchange effect. The dirt on the surface of the heat exchange tube is cleaned by a steel wire rope to avoid the dirt affecting the heat exchange effect and the inconvenience of cleaning. The present invention proposes a tube-wrapped tube partitioned coupling heat exchanger and a gradient tube layout method thereof.

[0006] The technical solution adopted by the present invention to solve the technical problem is as follows: a tube-wrapped tube zoned coupling heat exchanger and a gradient tube arrangement method thereof described in the present invention comprises a tube shell, two ends of the tube shell are equipped with heads, an air inlet pipe and an air outlet pipe are respectively installed on the two heads, tube sheets are installed at both ends of the tube shell, spiral heat exchange tubes are installed between the tube sheets, and a liquid inlet pipe and a liquid outlet pipe are respectively installed at both ends of the tube shell; The end of the spiral heat exchange tube is provided with a straight tube section, a rotating ring is rotatably mounted on the straight tube section, and small blades are mounted on the rotating ring, and the small blades rotate when impacted by cold water; The spiral heat exchange tube is wound with a steel wire in a spiral shape, and both ends of the steel wire are respectively connected to the swivels at both ends of the spiral heat exchange tube; A central rod is installed in the tube shell, and the central rod is located in the middle of each group of spiral heat exchange tubes. Both ends of the central rod are rotatably installed on the tube sheet. A large blade is installed on one end of the central rod, and the large blade is located in the space surrounded by the head, the tube sheet, and the tube shell. An impeller is installed on the central rod, and the impeller is a centrifugal impeller.

[0007] Preferably, the surface of the steel wire is wrapped with a rubber layer, the surface of the rubber layer is provided with a protrusion, and the protrusion is in contact with the surface of the spiral heat exchange tube.

[0008] Preferably, the protrusion is in a spiral shape, and the spiral shapes of the protrusion and the steel wire are in the same direction.

[0009] Preferably, a corrugated pipe section is installed in the middle of the straight pipe section, one end of the straight pipe section away from the spiral heat exchange tube is installed on the tube sheet, and an elastic frame is installed on one end of the straight pipe section close to the spiral heat exchange tube; The elastic frame is located between the corrugated pipe section and the rotating ring, and the small blades are eccentrically installed on the straight pipe section.

[0010] Preferably, baffles are installed on the inner wall of the tube shell, and the baffles are provided in multiple groups. The baffles are in a spiral shape, and the pitch of each group of baffles gradually increases along the flow direction of the liquid in the tube shell.

[0011] Preferably, a hollow cavity is provided inside the center rod, a suction port is provided at one end of the center rod close to the large impeller, and a discharge port is provided on the center rod, and the discharge port corresponds to the impeller one by one.

[0012] Preferably, the diameter of one end of the hollow cavity close to the large impeller is larger than that of the other end.

[0013] A gradient pipe layout method for a tube-coiled and wound tube zoned coupled heat exchanger, the pipe layout method being applicable to any of the tube-coiled and wound tube zoned coupled heat exchangers described above, the pipe layout method comprising the following steps: S1: Multiple groups of spiral heat exchange tubes are evenly arranged around the center line of the tube shell; the spiral heat exchange tubes form a multi-layer concentric structure along the circumference of different radii; S2: The spiral heat exchange tubes on circles with different radii are arranged in a staggered manner.

[0014] The beneficial effects of the present invention are as follows: 1. The present invention discloses a tube-in-tube partition coupling heat exchanger and a gradient pipe layout method thereof. By arranging spiral heat exchange tubes, steel wires, a center rod and an impeller, the impeller is used to make the liquid in the tube shell flow from the middle toward the inner wall, thereby promoting the flow of the liquid in the tube shell, making the liquid in a turbulent state, promoting heat exchange, and improving the heat exchange effect and efficiency. At the same time, the surface of the spiral heat exchange tube is cleaned to avoid the adhesion of dirt during long-term operation, which affects the heat exchange efficiency.

[0015] 2. The present invention describes a tube-in-tube partitioned coupling heat exchanger and a gradient pipe layout method thereof. By arranging steel wires, rubber layers and raised sheets, when the steel wires rotate around the spiral heat exchange tubes, dirt on the surface of the tubes is cleaned while the liquid near the surface is stirred, so that the liquid is in a turbulent state, further increasing the temperature difference of the liquid near the surface of the spiral heat exchange tubes and improving the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the accompanying drawings.

[0017] Figure 1 is a three-dimensional diagram of a heat exchanger of the present invention; Figure 2 It is a schematic diagram of the installation of the center rod in the heat exchanger of the present invention; Figure 3 1 is a schematic diagram of the structure of one group of spiral heat exchange tubes in the heat exchanger of the present invention, wherein the steel wires are not marked; Figure 4 It is a schematic diagram of the structure of the spiral heat exchange tube in the heat exchanger of the present invention; Figure 5 It is a schematic diagram of the structure of the steel wire rope in the heat exchanger of the present invention; Figure 6 yes Figure 2 A partial enlarged view of the middle A; Figure 7 It is a method block diagram of the gradient pipe arrangement method of the heat exchanger of the present invention; In the figure: tube shell 1, head 11, tube sheet 12, elastic frame 13, air inlet pipe 14, liquid outlet pipe 15, liquid inlet pipe 16, air outlet pipe 17, baffle 18, spiral heat exchange tube 2, straight tube section 21, corrugated tube section 22, center rod 3, large blade 31, hollow cavity 32, suction port 321, discharge port 322, impeller 33, small blade 4, swivel 41, steel wire 5, rubber layer 51, raised sheet 52. DETAILED DESCRIPTION

[0018] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0019] like Figures 1 to 7As shown, a tube-wrapped tube zoned coupling heat exchanger and a gradient tube arrangement method thereof described in the present invention include a tube shell 1, with headers 11 installed at both ends of the tube shell 1, an air inlet pipe 14 and an air outlet pipe 17 installed on the two headers 11, tube sheets 12 installed at both ends of the tube shell 1, spiral heat exchange tubes 2 installed between the tube sheets 12, and a liquid inlet pipe 16 and a liquid outlet pipe 15 installed at both ends of the tube shell 1; The end of the spiral heat exchange tube 2 is provided with a straight tube section 21, on which a rotating ring 41 is rotatably mounted, and on which a small blade 4 is mounted, and the small blade 4 rotates when impacted by cold water; The spiral heat exchange tube 2 is wound with a steel wire 5, the steel wire 5 is in a spiral shape, and both ends of the steel wire 5 are respectively connected to the swivels 41 at both ends of the spiral heat exchange tube 2; A central rod 3 is installed in the tube shell 1, and the central rod 3 is located in the middle of each group of spiral heat exchange tubes 2. Both ends of the central rod 3 are rotatably installed on the tube sheet 12. A large blade 31 is installed on one end of the central rod 3, and the large blade 31 is located in the space surrounded by the head 11, the tube sheet 12, and the tube shell 1. An impeller 33 is installed on the central rod 3, and the impeller 33 is a centrifugal impeller 33; During operation, cold water enters the tube shell 1 from the liquid inlet pipe 16, immersing the spiral heat exchange tube 2 in the tube shell 1. After that, the cold water with increased temperature after heat exchange is discharged from the liquid outlet pipe 15, waiting for subsequent use. At the same time, the hot air enters the space in the headers 11 at both ends of the tube shell 1 from the air inlet pipe 14, and then enters the spiral heat exchange tube 2. After the hot air in the spiral heat exchange tube 2 exchanges heat with the cold water in the tube shell 1, the hot air with reduced temperature re-enters the space in the other header 11, and finally is discharged from the heat exchanger from the air outlet pipe 17. In this process, when cold water enters the tube shell 1, the cold water will impact the small blades 4, thereby driving the small blades 4 to rotate. After that, the steel wire 5 spirally wound on the spiral heat exchange tube 2 is also driven to rotate, grinding, scraping and cleaning the surface of the spiral heat exchange tube 2 to avoid dirt accumulation on the surface of the spiral heat exchange tube 2 after long-term operation, which affects the heat exchange efficiency and heat exchange effect of the heat exchanger; At the same time, the rotating steel wire 5 will disturb the liquid near the surface of the spiral heat exchange tube 2, so that the liquid is transformed into a turbulent state, thereby promoting heat exchange between the cold water in the tube shell 1 and the hot air in the spiral heat exchange tube 2, thereby improving the heat exchange efficiency and effect of the heat exchanger; At the same time, when the hot air passes through the spiral heat exchange tube 2 in the heat exchanger, the hot air will impact the large blades 31 in the head 11, pushing the large blades 31 to rotate. In this process, the impeller 33 located on the center rod 3 in the tube shell 1 will centrifugally throw out the cold water in the middle position of each group of spiral heat exchange tubes 2 in the tube shell 1 under the action of centrifugal force, so that this part of the cold water moves from the middle position of the tube shell 1 to the inner wall position of the tube shell 1, fully promoting the flow of cold water in the tube shell 1, making the cold water in a turbulent state, and improving the heat exchange effect and efficiency between cold water and hot air, so that the spiral heat exchange tube 2 cooperates with the center rod 3 and the impeller 33 to fully improve the heat exchange effect and efficiency of the heat exchanger.

[0020] As an embodiment of the present invention, the surface of the steel wire 5 is wrapped with a rubber layer 51, and the surface of the rubber layer 51 is provided with a protrusion 52, and the protrusion 52 is in contact with the surface of the spiral heat exchange tube 2; By providing a rubber layer 51 on the surface of the steel wire 5, the wear of the steel wire 5 and the surface of the spiral heat exchange tube 2 is reduced, and the steel wire 5 is prevented from being exposed to the liquid in the tube shell 1 and corroded, thereby extending the maintenance cycle and service life of the heat exchanger. At the same time, the surface of the spiral heat exchange tube 2 is scraped and cleaned by the raised sheet 52 provided on the rubber layer 51, so as to avoid the accumulation of dirt on the surface of the spiral heat exchange tube 2 as much as possible, thereby affecting the heat exchange effect of the heat exchanger. At the same time, the protrusions 52 make the surface of the steel wire 5 rough. When the steel wire 5 rotates around the surface of the spiral heat exchange tube 2, it will stir the liquid near the surface of the spiral heat exchange tube 2 to a greater extent, change the flow state of the liquid near the surface of the spiral heat exchange tube 2, increase the temperature difference near the surface of the spiral heat exchange tube 2, and improve the heat exchange efficiency.

[0021] As an embodiment of the present invention, the protruding piece 52 is in a spiral shape, and the spiral shapes of the protruding piece 52 and the steel wire 5 have the same direction; Since the protrusion 52 and the spiral shape of the steel wire 5 are in the same direction, when the steel wire 5 rotates around the surface of the spiral heat exchange tube 2, the dirt will be fully cleaned off and pushed in the direction of the liquid flow in the tube shell 1, so that the cleaned dirt is carried away with the flow of cold water in the tube shell 1, reducing the possibility of dirt residue and accumulation in the tube shell 1, thereby facilitating the cleaning of the heat exchanger and extending the maintenance period of the heat exchanger.

[0022] As an embodiment of the present invention, a corrugated pipe section 22 is installed in the middle of the straight pipe section 21, an end of the straight pipe section 21 away from the spiral heat exchange tube 2 is installed on the tube sheet 12, and an elastic frame 13 is installed on the end of the straight pipe section 21 close to the spiral heat exchange tube 2; The elastic frame 13 is located between the bellows section 22 and the swivel 41, and the small blade 4 is eccentrically installed on the straight pipe section 21; The spiral heat exchange tube 2 in the tube shell 1 is relatively isolated from the heat exchanger by the bellows section 22 and the elastic frame 13, thereby reducing the influence of the vibration of the spiral heat exchange tube 2 on the heat exchanger. At the same time, since the small blade 4 is eccentrically installed on the straight tube section 21, when the small blade 4 is impacted by the cold water entering the heat exchanger, the small blade 4 will rotate normally, and drive the straight tube section 21 and the spiral heat exchange tube 2 to vibrate. In this process, the temperature gradient distribution state of the cold water near the spiral heat exchange tube 2 in the tube shell 1 is further changed by the vibration, so that the temperature difference of the cold water near the spiral heat exchange tube 2 is relatively increased, thereby improving the heat exchange efficiency between the hot gas in the spiral heat exchange tube 2 and the cold water in the tube shell 1, and reducing the possibility of scale and dirt in the cold water forming on the surface of the spiral heat exchange tube 2.

[0023] As an embodiment of the present invention, a baffle 18 is installed on the inner wall of the tube shell 1, and the baffle 18 is provided in multiple groups. The baffle 18 is in a spiral shape, and the pitch of each group of the baffles 18 gradually increases along the flow direction of the liquid in the tube shell 1; The installed baffle 18 is used to further guide the cold water flowing in the tube shell 1. Since the pitch of the baffle 18 gradually increases along the flow direction of the liquid in the tube shell 1, the cold water with a lower temperature that has just entered the tube shell 1 will be guided by the baffle 18 and will rotate more circles around the spiral heat exchange tube 2, thereby extending the contact time between the cold water with a lower temperature and the hot air with a higher temperature, thereby improving the heat exchange efficiency between the two and making the heat exchange efficiency and effect of the heat exchanger better.

[0024] As an embodiment of the present invention, a hollow cavity 32 is formed inside the central rod 3, a suction port 321 is formed at one end of the central rod 3 close to the large impeller 33, and a discharge port 322 is formed on the central rod 3, and the discharge port 322 corresponds to the impeller 33 one by one; Through the hollow cavity 32, the suction port 321 and the discharge port 322 in the center rod 3, when the impeller 33 rotates, a suction force is generated at the suction port 321, so that the cold water with a lower temperature just entering the tube shell 1 is sucked into the hollow cavity 32, and then thrown out from the impeller 33 toward the inner wall of the tube shell 1, further promoting the flow of the liquid in the tube shell 1 to be in a turbulent state, increasing the temperature difference of the liquid near the spiral heat exchange tube 2, and improving the heat exchange effect; At the same time, low-temperature cold water is transported through the hollow cavity 32 in the center rod 3 to ensure that the temperature of the liquid thrown to the inner wall of the tube shell 1 by the impeller 33 is relatively low, so as to avoid the relatively dense distribution of the spiral heat exchange tubes 2 in the tube shell 1. The radial flow of cold water in the tube shell 1 is easily obstructed, resulting in the liquid absorbed and thrown out when the impeller 33 rotates being the cold water with higher temperature at the center of the tube shell 1 and in the middle of each spiral heat exchange tube 2, resulting in the impeller 33 The effect of circulating the liquid in the tube shell 1 and increasing the temperature difference is not good, thereby affecting the heat exchange effect and efficiency of the heat exchanger.

[0025] As an embodiment of the present invention, the diameter of one end of the hollow cavity 32 close to the large impeller 33 is larger than the diameter of the other end; Since multiple groups of impellers 33 are installed on the central rod 3, in order to ensure that the impeller 33 on the end of the central rod 3 far away from the large blade 31 can work normally, the diameter of the hollow cavity 32 close to the large impeller 33 is made larger, thereby ensuring that each impeller 33 can obtain sufficient cold water with a lower temperature from the hollow cavity 32, so that the flow of liquid in the tube shell 1 is guaranteed and the liquid is in a turbulent state, thereby increasing the liquid temperature difference near the spiral heat exchange tube 2 and making the heat exchange efficiency higher.

[0026] A gradient pipe layout method for a tube-coiled and wound tube zoned coupled heat exchanger, the pipe layout method being applicable to any of the tube-coiled and wound tube zoned coupled heat exchangers described above, the pipe layout method comprising the following steps: S1: multiple groups of spiral heat exchange tubes 2 are evenly arranged around the center line of the tube shell 1; the spiral heat exchange tubes 2 form a multi-layer concentric structure along the circumference of different radii; S2: The spiral heat exchange tubes 2 located on circles with different radii are arranged in a staggered manner.

[0027] The specific workflow is as follows: During operation, cold water enters the tube shell 1 from the liquid inlet pipe 16, immersing the spiral heat exchange tube 2 in the tube shell 1. After that, the cold water with increased temperature after heat exchange is discharged from the liquid outlet pipe 15, waiting for subsequent use. At the same time, the hot air enters the space in the headers 11 at both ends of the tube shell 1 from the air inlet pipe 14, and then enters the spiral heat exchange tube 2. After the hot air in the spiral heat exchange tube 2 exchanges heat with the cold water in the tube shell 1, the hot air with reduced temperature re-enters the space in the other header 11, and finally is discharged from the heat exchanger from the air outlet pipe 17. In this process, when cold water enters the tube shell 1, the cold water will impact the small blades 4, thereby driving the small blades 4 to rotate. After that, the steel wire 5 spirally wound on the spiral heat exchange tube 2 is also driven to rotate, cleaning the surface of the spiral heat exchange tube 2. At the same time, the rotating steel wire 5 will disturb the liquid near the surface of the spiral heat exchange tube 2, causing the liquid to change into a turbulent state, thereby promoting heat exchange; At the same time, when the hot gas passes through the spiral heat exchange tube 2 in the heat exchanger, the hot gas will impact the large blades 31 in the head 11, pushing the large blades 31 to rotate. In this process, the impeller 33 located on the center rod 3 in the tube shell 1 will centrifugally throw out the cold water in the middle position of each group of spiral heat exchange tubes 2 in the tube shell 1 under the action of centrifugal force, so that this part of the cold water moves from the middle position of the tube shell 1 to the inner wall position of the tube shell 1, fully promoting the flow of cold water in the tube shell 1, making the cold water in a turbulent state, and improving the heat exchange effect and efficiency between cold water and hot gas; By providing a rubber layer 51 on the surface of the steel wire 5, the wear between the steel wire 5 and the surface of the spiral heat exchange tube 2 is reduced, and the steel wire 5 is prevented from being exposed to the liquid in the tube shell 1 and corroded. At the same time, the surface of the spiral heat exchange tube 2 is cleaned by the protruding piece 52 provided on the rubber layer 51; At the same time, the protrusions 52 make the surface of the steel wire 5 rough. When the steel wire 5 rotates around the surface of the spiral heat exchange tube 2, the liquid near the surface of the spiral heat exchange tube 2 will be stirred to a greater extent, changing the flow state of the liquid near the surface of the spiral heat exchange tube 2, thereby increasing the temperature difference near the surface of the spiral heat exchange tube 2. Since the protrusions 52 and the steel wire 5 have the same spiral shape direction, when the steel wire 5 rotates around the surface of the spiral heat exchange tube 2, the dirt will be fully cleaned off and the cleaned dirt will be pushed toward the direction of the liquid flow in the tube shell 1, so that the cleaned dirt will be taken away with the flow of cold water in the tube shell 1; The spiral heat exchange tube 2 in the tube shell 1 is relatively isolated from the heat exchanger by the bellows section 22 and the elastic frame 13. At the same time, since the small blade 4 is eccentrically installed on the straight tube section 21, when the small blade 4 is impacted by the cold water entering the heat exchanger, the small blade 4 will rotate normally, and drive the straight tube section 21 and the spiral heat exchange tube 2 to vibrate. In this process, the temperature gradient distribution state of the cold water near the spiral heat exchange tube 2 in the tube shell 1 is further changed by the vibration, so that the temperature difference of the cold water near the spiral heat exchange tube 2 is relatively increased, and the possibility of scale and dirt in the cold water being generated on the surface of the spiral heat exchange tube 2 is reduced; Since the baffle 18 gradually increases the pitch along the liquid flow direction in the tube shell 1, the cold water with a lower temperature just entering the tube shell 1 will rotate more circles around the spiral heat exchange tube 2 after being guided by the baffle 18, that is, the contact time between the cold water with a lower temperature and the hot air with a higher temperature is prolonged, thereby improving the heat exchange efficiency; Through the hollow cavity 32, the suction port 321 and the discharge port 322 in the center rod 3, when the impeller 33 rotates, a suction force is generated at the suction port 321, and the cold water with a lower temperature just entering the tube shell 1 is sucked into the hollow cavity 32, and then thrown out from the impeller 33 toward the inner wall of the tube shell 1, further promoting the flow of the liquid in the tube shell 1 to be in a turbulent state, and increasing the temperature difference of the liquid near the spiral heat exchange tube 2; At the same time, the cold water with low temperature is transported through the hollow cavity 32 in the center rod 3, so as to ensure that the temperature of the liquid thrown to the inner wall of the tube shell 1 by the impeller 33 is relatively low; Since multiple groups of impellers 33 are installed on the central rod 3, in order to ensure that the impeller 33 on the end of the central rod 3 far away from the large blade 31 can work normally, the diameter of the hollow cavity 32 close to the large impeller 33 is made larger, thereby ensuring that each impeller 33 can obtain sufficient cold water with a lower temperature from the hollow cavity 32, so that the flow of liquid in the tube shell 1 is guaranteed, the liquid is in a turbulent state, and the temperature difference of the liquid near the spiral heat exchange tube 2 is increased.

[0028] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A tube-wound tube zoned coupling heat exchanger and a gradient tube arrangement method thereof, comprising a tube shell (1), wherein both ends of the tube shell (1) are provided with a head (11), an air inlet pipe (14) and an air outlet pipe (17) are respectively provided on the two heads (11), tube sheets (12) are provided at both ends of the tube shell (1), a spiral heat exchange tube (2) is provided between the tube sheets (12), and a liquid inlet pipe (16) and a liquid outlet pipe (15) are respectively provided at both ends of the tube shell (1); Features: The end of the spiral heat exchange tube (2) is provided with a straight tube section (21), a rotating ring (41) is rotatably mounted on the straight tube section (21), a small blade (4) is mounted on the rotating ring (41), and the small blade (4) rotates when subjected to the impact of cold water; A steel wire (5) is wound around the spiral heat exchange tube (2), the steel wire (5) is in a spiral shape, and two ends of the steel wire (5) are respectively connected to the swivels (41) at two ends of the spiral heat exchange tube (2); A central rod (3) is installed in the tube shell (1), the central rod (3) is located in the middle of each group of spiral heat exchange tubes (2), both ends of the central rod (3) are rotatably installed on the tube sheet (12), a large blade (31) is installed on one end of the central rod (3), and the large blade (31) is located in a space surrounded by the head (11), the tube sheet (12) and the tube shell (1); An impeller (33) is mounted on the central rod (3), and the impeller (33) is a centrifugal impeller (33).

2. According to claim 1, a tube-wound tube zoned coupling heat exchanger and a gradient tube layout method thereof are characterized in that: The surface of the steel wire (5) is wrapped with a rubber layer (51), the surface of the rubber layer (51) is provided with a protruding piece (52), and the protruding piece (52) is in contact with the surface of the spiral heat exchange tube (2).

3. According to claim 2, a tube-wrapped tube zoned coupling heat exchanger and a gradient tube layout method thereof are characterized in that: The protruding piece (52) is in a spiral shape, and the spiral shapes of the protruding piece (52) and the steel wire (5) are in the same direction.

4. According to claim 1, a tube-wrapped tube zoned coupling heat exchanger and a gradient tube layout method thereof are characterized in that: A corrugated pipe section (22) is installed in the middle of the straight pipe section (21); one end of the straight pipe section (21) away from the spiral heat exchange tube (2) is installed on the tube sheet (12); and an elastic frame (13) is installed on one end of the straight pipe section (21) close to the spiral heat exchange tube (2); The elastic frame (13) is located between the corrugated pipe section (22) and the rotating ring (41), and the small blade (4) is eccentrically installed on the straight pipe section (21).

5. According to claim 1, a tube-wrapped tube zoned coupling heat exchanger and a gradient tube layout method thereof are characterized in that: The inner wall of the tube shell (1) is provided with a baffle (18), and the baffles (18) are provided in multiple groups. The baffles (18) are in a spiral shape, and the pitch of each group of the baffles (18) gradually increases along the flow direction of the liquid in the tube shell (1).

6. According to claim 1, a tube-wrapped tube zoned coupling heat exchanger and a gradient tube layout method thereof are characterized in that: A hollow cavity (32) is provided inside the central rod (3), a suction port (321) is provided at one end of the central rod (3) close to the large impeller (33), and a discharge port (322) is provided on the central rod (3), and the discharge port (322) corresponds to the impeller (33) in a one-to-one manner.

7. According to claim 6, a tube-wrapped tube zoned coupling heat exchanger and a gradient tube layout method thereof are characterized in that: The diameter of one end of the hollow cavity (32) close to the large impeller (33) is larger than that of the other end.

8. A gradient pipe layout method for a tube-wound tube zoned coupling heat exchanger, characterized in that: The pipe laying method is applicable to a tube-wound tube zoned coupling heat exchanger according to any one of claims 1 to 7, and the pipe laying method comprises the following steps: S1: multiple groups of spiral heat exchange tubes (2) are evenly arranged around the center line of the tube shell (1); the spiral heat exchange tubes (2) form a multi-layer concentric structure along circles of different radii; S2: The spiral heat exchange tubes (2) located on circles with different radii are arranged in a staggered manner.

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