A double pipe heat exchanger

Abstract

The utility model provides a kind of double-pipe heat exchanger, including inner tube and outer tube of being sleeved in inner tube outside, it is equipped with descaling structure in inner tube, and descaling structure includes: baffle, it is arranged in inner tube, and peripheral surface is connected with the tube wall of inner tube, including multiple spaced arrangement along the extension direction of inner tube, and hollow hole for heat exchange medium to flow through is equipped in baffle middle part;Descaling ball is arranged between two adjacent baffles, and diameter is greater than the maximum width of hollow hole.The utility model is by being equipped with descaling ball in inner tube, and multiple baffles are arranged in inner tube, and descaling ball is arranged between two adjacent baffles, and descaling ball is evenly distributed in inner tube in inner tube, and hollow hole is arranged in baffle middle part, can make the heat exchange medium of double-pipe heat exchanger can flow through in inner tube, and the maximum width of hollow hole is less than the diameter of descaling ball, prevent descaling ball from being driven under heat exchange medium and passing through baffle, the problem of losing the limiting function of descaling ball.

Description

Technical Field

[0001] This utility model belongs to the field of heat exchangers, specifically relating to a shell-and-tube heat exchanger. Background Technology

[0002] Shell-and-tube heat exchangers are widely used in various industries, such as metallurgy, petrochemicals, coal chemicals, central air conditioning, oil and gas gathering and transportation, power plants, and municipal heating. The most critical issue for shell-and-tube heat exchangers is scaling. Scale prevention and removal are crucial for the safe and stable operation of production facilities. Generally, after a period of operation, scale accumulates on the heat transfer walls, adding thermal resistance and lowering the heat transfer coefficient (K-value), severely impacting heat exchange efficiency. Scale buildup primarily occurs during heat exchange as water temperature rises and water evaporates, altering water quality. Carbon monoxide levels decrease, pH increases, and the solubility of calcium carbonate decreases. When the calcium carbonate concentration reaches supersaturation, it crystallizes and precipitates as scale. Scale has a significant impact on shell-and-tube heat exchangers. Scale buildup can easily cause blockages, increasing system resistance and resulting in substantial energy waste and economic losses. The formation of fouling in heat exchange equipment is an extremely complex physicochemical process involving the transfer of energy, mass, and momentum. The presence of fouling causes significant economic and energy losses to heat exchange equipment widely used in various industrial enterprises. Therefore, the fouling problem has become one of the most concerning issues for the heat transfer community and industry, yet it remains unsolved to this day.

[0003] Chinese utility model patent application number CN201822051971.5 discloses an automatic descaling heat exchanger with in-pipe circulation. It changes the direction of water flow by alternately controlling the opening and closing of valves, thereby driving metal descaling balls to brush the pipe wall through the water flow, so that the metal balls descal the inner surface of the heat exchanger.

[0004] However, in the aforementioned patent, the metal ball is pushed to circulate in the pipe by water pressure. On the one hand, this will result in uneven descaling area of ​​the ball and cause significant wear to the pipe wall. On the other hand, the ball is prone to blockage due to scale during circulation.

[0005] Therefore, designing a shell-and-tube heat exchanger with uniform descaling and high flowability of the heat exchange medium in the inner tube has become a technical problem that urgently needs to be solved by those skilled in the art.

[0006] In view of the above, this utility model is hereby proposed. Utility Model Content

[0007] This utility model provides a shell-and-tube heat exchanger. By setting descaling balls in the inner tube, the diameter of the descaling balls being much smaller than the inner diameter of the inner tube, the descaling balls have sufficient space to move. Multiple baffles are set in the inner tube, with the descaling balls positioned between two adjacent baffles, so that the descaling balls in the inner tube are evenly distributed. Holes are set in the middle of the baffles, which allows the heat exchange medium of the shell-and-tube heat exchanger to flow in the inner tube. This overcomes the problems of uneven descaling effect of the descaling balls and low flowability of the heat exchange medium in the inner tube in the prior art.

[0008] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by this utility model is as follows:

[0009] A shell-and-tube heat exchanger includes an inner tube and an outer tube sleeved outside the inner tube. The inner tube is provided with a descaling structure, which includes:

[0010] Baffles are installed inside the inner tube and are connected to the tube wall of the inner tube on their circumference. Multiple baffles are arranged at intervals along the extension direction of the inner tube. The baffles have hollow holes in the middle for the heat exchange medium to flow through.

[0011] The descaling ball is placed between two adjacent baffles, and its diameter is larger than the maximum width of the perforated hole.

[0012] Furthermore, the baffle includes:

[0013] The retaining ring comprises multiple rings arranged coaxially and radially spaced apart, with the width between two adjacent retaining rings being smaller than the diameter of the descaling ball;

[0014] The support arm connects between two adjacent blocking rings.

[0015] Furthermore, the diameter of the innermost retaining ring is smaller than the diameter of the descaling ball;

[0016] Alternatively, the diameter of the innermost retaining ring is greater than or equal to the diameter of the descaling ball, and a retaining arm is provided on the inner circumference of the innermost retaining ring so that the maximum width of the hollow hole on the inner circumference of the innermost retaining ring is less than the diameter of the descaling ball.

[0017] Preferably, the blocking arm is cross-shaped or grid-shaped.

[0018] Furthermore,

[0019] The outermost retaining ring is spaced apart from the inner tube wall, and the maximum width between the inner tube wall and the outermost retaining ring is less than the diameter of the descaling ball.

[0020] The outermost blocking ring has a support arm on its outer periphery, and the baffle is connected to the inner tube wall through the support arm.

[0021] Furthermore, the baffle is perpendicular to the extension direction of the inner tube.

[0022] Furthermore,

[0023] The outer tube and the inner tube are coaxially arranged, the inner diameter of the outer tube is larger than the outer diameter of the inner tube, and the extension length of the outer tube is smaller than the extension length of the inner tube.

[0024] The baffles are installed in the pipe sections corresponding to the inner and outer pipes, with the baffles at both ends of the inner pipe positioned at positions corresponding to the ends of the outer pipe.

[0025] Furthermore, the pipe sections corresponding to the inner and outer pipes are at least partially set as threaded sections;

[0026] The threaded section has an annular groove on its wall that is recessed towards the axis of the inner tube.

[0027] The annular groove is a spiral extending along the axial direction of the inner tube;

[0028] Furthermore, the interval between two adjacent baffles within the threaded section is less than or equal to the interval between two adjacent baffles within the inner tube section outside the threaded section.

[0029] The axial length of the inner wall of the inner tube between two adjacent annular grooves is equal to the width of the bottom of the annular groove.

[0030] Preferably, the cross-section of the annular groove is an isosceles trapezoid.

[0031] Furthermore, multiple descaling balls are provided between two adjacent baffles;

[0032] Preferably, the number of descaling balls between two adjacent baffles within the threaded section is greater than or equal to the number of descaling balls between two adjacent baffles within the inner pipe section outside the threaded section.

[0033] Furthermore, the pipe sections corresponding to the inner and outer pipes also include extension sections, which are set at both ends of the threaded section, and the pipe wall of the extension section extends along the extension direction of the inner pipe.

[0034] The outer pipe wall is provided with an outer pipe interface that communicates with the outer pipe. The outer pipe interface extends radially along the outer pipe, and the end of the outer pipe interface closest to its axis corresponds to the middle of the extension section.

[0035] By adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art:

[0036] 1. This utility model, by setting a descaling ball in the inner tube, the diameter of the descaling ball being much smaller than the inner diameter of the inner tube, on the one hand, avoids the descaling ball from being blocked by scale, and on the other hand, can improve the flow of heat exchange medium in the inner tube, thereby improving the heat exchange efficiency.

[0037] 2. This utility model sets multiple baffles in the inner tube to evenly distribute the descaling balls in the inner tube, and sets a perforation in the middle of the baffles, which allows the heat exchange medium of the shell-and-tube heat exchanger to flow in the inner tube. On the one hand, it can avoid the accumulation of descaling balls in the inner tube, and on the other hand, it can ensure the smooth flow of the heat exchange medium in the inner tube.

[0038] 3. In this utility model, the maximum width of the hollow hole is smaller than the diameter of the descaling ball, which prevents the descaling ball from flowing through the hollow hole and reduces the limiting effect of the baffle on the descaling ball. Attached Figure Description

[0039] The accompanying drawings, as part of this utility model, are used to provide a further understanding of the present utility model. The illustrative embodiments and descriptions of the present utility model are used to explain the present utility model, but do not constitute an undue limitation of the present utility model. Obviously, the drawings described below are merely some embodiments; those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0040] Figure 1 This is a schematic cross-sectional view of the entire structure in Example 1;

[0041] Figure 2 This is a schematic diagram of the baffle structure in Example 1;

[0042] Figure 3 This is a schematic cross-sectional view of the entire structure in Example 2;

[0043] Figure 4 This is a schematic diagram of the connecting part structure in Embodiment 2;

[0044] Figure 5 This is a schematic diagram of the heat exchange column structure in Example 2;

[0045] Figure 6 This is a schematic diagram of the descaling ball structure in Example 2;

[0046] Figure 7 This is a cross-sectional view of the overall structure in Example 3.

[0047] Description of main components in the diagram:

[0048] 1. Outer tube; 11. Outer tube interface; 2. Inner tube; 21. Threaded section; 22. Extension section; 23. Blocking part; 3. Baffle; 31. Support arm; 32. Blocking ring; 33. Hollow hole; 4. Descaling ball; 5. Heat exchange column; 51. Connecting part; 511. Connecting body; 512. Connecting arm; 513. Threaded part. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0050] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0051] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0052] like Figure 1-2 As shown in the figure, this utility model embodiment provides a shell-and-tube heat exchanger, which includes an inner tube 2 and an outer tube 1 sleeved on the inner tube 2 and coaxially arranged with it. It also includes a heat exchange medium, which flows in either the inner tube 2 or the outer tube 1; that is, the heat exchange medium flows in the inner tube 2, while the liquid requiring heat exchange flows in the outer tube 1. When the heat exchange medium flows in the outer tube 1, the liquid requiring heat exchange flows in the inner tube 2. Long-term operation of the shell-and-tube heat exchanger can lead to scale buildup, resulting in reduced efficiency, increased energy consumption, and shortened lifespan. If the scale is not removed in time, the equipment may need repair, downtime, or replacement. Traditional cleaning methods, such as mechanical methods (scraping, brushing), high-pressure water, and chemical cleaning (acid washing), have long presented many problems when cleaning heat exchangers: they cannot completely remove scale and other deposits, and can cause corrosion to the equipment. Residual acid can cause secondary corrosion or under-deposit corrosion of the material, ultimately leading to equipment replacement. In addition, the cleaning wastewater is toxic, requiring significant funds for wastewater treatment, and manual intervention is necessary during the cleaning process. This utility model provides an anti-scaling structure for a shell-and-tube heat exchanger to address these issues. This anti-scaling shell-and-tube heat exchanger can remove scale before it accumulates in large quantities, achieving automatic descaling and avoiding the hassle of manual cleaning.

[0053] Specifically, in this embodiment of the invention, at least one descaling ball 4 is provided in the inner tube 2. When heat exchange medium flows in the inner tube 2, the flow of the heat exchange medium causes the descaling ball 4 to collide with the tube wall of the inner tube 2, thereby achieving the effect of removing the scale generated and attached to the tube wall of the inner tube 2, and thus improving the stability of the shell-and-tube heat exchanger.

[0054] Specifically, the more descaling balls 4 there are, the better the descaling effect. However, the more descaling balls 4 there are, the greater the pressure on the inner tube 2 will be, which will reduce the service life of the inner tube 2. On the other hand, the descaling balls 4 will occupy the space in the inner tube 2. The number of descaling balls 4 will affect the flow rate of the heat exchange medium in the inner tube 2. The more descaling balls 4 there are, the smaller the flow area of ​​the heat exchange medium in the inner tube 2, which will lead to insufficient heat exchange in the shell-and-tube heat exchanger and affect the heat exchange effect. Therefore, the number of descaling balls 4 should be increased or decreased according to the actual situation.

[0055] Specifically, the material of the descaling ball 4 is not limited to a single material. Metal, plastic, and any material that can achieve the descaling effect can be used as the material selection for the descaling ball 4 in this embodiment.

[0056] Specifically, the different materials used for the descaling balls 4 will have corresponding additional effects during the descaling process. For example, using non-reactive metals such as aluminum and copper can act as metal protection to improve corrosion resistance; descaling balls 4 made of plastic are quieter and lighter, which is conducive to descaling by mutual collision and also reduces frictional wear on the pipe wall. Therefore, the choice of material for the descaling balls 4 should be based on the user's needs.

[0057] Example 1

[0058] like Figure 1 , 2 As shown in the figure, this embodiment introduces a shell-and-tube heat exchanger, which includes an inner tube 2 and an outer tube 1 sleeved outside the inner tube. The inner tube 2 is provided with an anti-scaling structure, which includes a baffle 3 and a descaling ball 4.

[0059] Specifically, the baffle 3 is disposed in the inner tube 2, and its circumferential surface is connected to the tube wall of the inner tube 2. It includes a plurality of baffles 3 arranged at intervals along the extension direction of the inner tube 2. It also includes descaling balls 4, which are disposed between two adjacent baffles 3. One or more descaling balls 4 are disposed between each pair of adjacent baffles 3. The heat exchange medium can flow in either the inner tube 2 or the outer tube 1. In this embodiment, the heat exchange medium flows in the inner tube 2.

[0060] Specifically, the baffle 3 has perforated holes 33 to allow the heat exchange medium in the inner tube 2 to flow. The function of the baffle 3 is to separate the multiple descaling balls 4, so that the descaling balls 4 are evenly distributed in the inner tube 2. When the heat exchange medium flows in the inner tube 2, the descaling balls 4 in two adjacent baffles 3 are limited to a certain range of movement, preventing the descaling balls 4 from moving randomly without restriction and causing them to accumulate in one position. If the descaling balls 4 are too clustered, it will not improve the descaling efficiency and will make the descaling area uneven. On the other hand, when the descaling balls 4 are clustered together, the impact force is greater when they impact the tube wall of the inner tube 2, and the wear and tear on the inner tube 2 is also greater, which is not conducive to extending the service life of the inner tube 2.

[0061] Specifically, the maximum width of the perforated hole 33 on the baffle 3 is smaller than the diameter of the descaling ball 4. When the heat exchange medium flows in the inner tube 2, it will drive the descaling ball 4 to move. The function of the baffle 3 is to limit the descaling ball 4 within a certain range, while ensuring the passage of the heat exchange medium. In this embodiment, the heat exchange medium can be allowed to flow in the inner tube 2 by setting the perforated hole 33 on the baffle 3. At the same time, the diameter of the perforated hole 33 should be smaller than the diameter of the descaling ball 4 to prevent the descaling ball 4 from changing position under the impact of the heat exchange medium and passing through the perforated hole 33 in the baffle 3, which would further cause the baffle 3 to lose its function of limiting the descaling ball 4.

[0062] Specifically, the shape of the perforated hole 33 can be set to a circle, a polygon, or an irregular shape, as long as the maximum width of the perforated hole 33 is less than the diameter of the descaling ball 4, so that the descaling ball 4 cannot pass through it.

[0063] In this embodiment of the present invention, the baffle 3 includes multiple blocking rings 32 and multiple support arms 31. The blocking rings 32 include multiple rings arranged coaxially and radially spaced. The width between two adjacent blocking rings 32 is smaller than the diameter of the descaling ball 4. In this scheme, the width between the blocking rings 32 is equivalent to the hollow hole 33. On the one hand, it ensures the flow of the heat exchange medium, and on the other hand, it prevents the descaling ball 4 from passing through the blocking rings 32 and flowing between the other two baffles 3. At the same time, the design of the blocking rings 32 increases the flow of the heat exchange medium in the inner tube 2 while ensuring that the descaling ball 4 cannot pass through, thereby improving the heat exchange efficiency of the shell-and-tube heat exchanger to a certain extent.

[0064] Specifically, the inner diameter of the innermost blocking ring 32 can be set to be smaller than the diameter of the descaling ball 4, or the inner diameter of the innermost blocking ring 32 can be set to be greater than or equal to the diameter of the descaling ball 4. A blocking arm is provided on the inner circumference of the innermost blocking ring 32 so that the maximum width of the hollow hole 33 on the inner circumference of the innermost blocking ring 32 is smaller than the diameter of the descaling ball 4. The blocking arm is preferably cross-shaped or grid-shaped.

[0065] Specifically, the support arm 31 is connected between two adjacent blocking rings 32, and plays a role in fixing the two adjacent blocking rings 32. When the outermost blocking ring 32 abuts against the wall of the inner tube 2 and is integrally set, the support arm 31 is not needed to connect the blocking ring 32 to the inner tube 2. When the outermost blocking ring 32 does not abut against the wall of the inner tube 2, the support arm 31 needs to be set between the wall of the inner tube 2 and the outermost blocking ring 32 to fix the blocking ring 32 to the wall of the inner tube 2.

[0066] Preferably, the outermost blocking ring 32 does not contact the wall of the inner tube 2. When the outermost blocking ring 32 contacts the wall of the inner tube 2, if the heat exchange medium does not flow in the inner tube 2, the outermost blocking ring 32 will block the heat exchange medium at the bottom of the inner tube 2 and between two adjacent blocking rings 32, causing liquid accumulation. Over time, this will corrode the descaling ball 4, affecting the descaling efficiency and the service life of the descaling ball 4.

[0067] Specifically, the baffle 3 is perpendicular to the extension direction of the inner tube 2. On the one hand, the flow direction of the heat exchange medium in the inner tube 2 is not fixed. If the baffle 3 is not perpendicular to the extension direction of the inner tube 2, the impact force of the heat exchange medium flowing along the inclined direction of the baffle 3 on the inner tube 2 will be less than the impact force of the heat exchange medium flowing in the other direction on the inner tube 2, resulting in unstable descaling effect. On the other hand, after the baffle 3 is tilted, the gap between the two adjacent blocking rings 32 will become larger. Compared with the setting method where the baffle 3 is perpendicular to the extension direction of the inner tube 2, under the same heat exchange medium flow, the inclined baffle 3 leaves a larger gap, which reduces the limiting function of the descaling ball 4.

[0068] In this embodiment, the support arm 31 is a rectangular plate that is arranged in a cross pattern. The intersection point coincides with the axis of the inner tube 2. The two ends of the support arm 31 abut against the tube wall of the inner tube 2 and are fixed thereto. The blocking ring 32 is arranged sequentially from the inside to the outside with the intersection point of the support arm 31 as the center, and is coplanar with the support arm 31.

[0069] Specifically, the cross-shaped support arm 31 has greater stability, and the connection between the blocking ring 32 and the support arm 31 is more robust. The structure is simple and its practical application effect is also improved compared to other structures.

[0070] Specifically, the extension length of the outer tube 1 is less than the extension length of the inner tube 2. The baffle 3 is set in the pipe section corresponding to the inner tube 2 and the outer tube 1. The baffles 3 at both ends of the inner tube 2 are set at positions corresponding to the two ends of the outer tube 1.

[0071] When the shell-and-tube heat exchanger is working, the liquid in the outer tube 1 exchanges heat with the heat exchange medium in the inner tube 2. During this process, due to the heat transfer, the scale in the inner tube 2 corresponding to the outer tube 1 increases. Therefore, the baffles 3 are set at the positions corresponding to both ends of the outer tube 1, thereby improving the descaling effect of the descaling balls 4 in the inner tube 2 corresponding to the outer tube.

[0072] Specifically, the pipe sections corresponding to the inner tube 2 and the outer tube 1 are at least partially configured as threaded sections 21. The pipe wall of the threaded section 21 is provided with an annular groove that is recessed towards the axis of the inner tube 2. The annular groove is spiral-shaped and extends along the axial direction of the inner tube 2. The interval between two adjacent baffles 3 in the threaded section 21 is less than or equal to the interval between two adjacent baffles 3 in the pipe section of the inner tube 2 outside the threaded section 21. The axial length of the inner wall of the inner tube 2 corresponding to two adjacent annular grooves is equal to the width of the bottom of the annular groove. Preferably, the cross-section of the annular groove is an isosceles trapezoid.

[0073] Specifically, the setting of the threaded section 21 can increase the heat exchange area within a limited length, thereby improving the heat exchange efficiency of the heat exchanger. Correspondingly, the scale at the threaded section 21 becomes more difficult to remove. In this embodiment of the invention, the distance between two adjacent baffles 3 corresponding to the threaded section 21 is reduced, and the descaling effect of the descaling ball 4 moving within a small range is greater than that of moving within a large range.

[0074] Preferably, the number of descaling balls 4 between two adjacent baffles 3 within the threaded section 21 is greater than or equal to the number of descaling balls 4 between two adjacent baffles 3 within the inner tube 2 section outside the threaded section 21. By setting a greater number of descaling balls 4 between two adjacent baffles 3 corresponding to the threaded section 21, the collision between the descaling balls 4 becomes more frequent when the heat exchange medium passes through, thereby improving the descaling efficiency of the descaling balls 4.

[0075] Specifically, the pipe sections corresponding to the inner pipe 2 and the outer pipe 1 also include extension sections 22. Extension sections 22 are provided at both ends of the threaded section 21, and the pipe wall of extension section 22 extends along the extension direction of the inner pipe 2. The pipe wall of the outer pipe 1 is provided with an outer pipe interface 11 that communicates with the outer pipe 1. The outer pipe interface 11 extends radially along the outer pipe 1, and the end of the outer pipe interface 11 near its axis corresponds to the middle part of the extension section 22.

[0076] Specifically, the outer pipe interface 11 is used to circulate the liquid in the outer pipe 1. Setting the outer pipe interface 11 in the extension section 22 is conducive to the circulation of liquid in the outer pipe 1, and avoids the circulating liquid from being too concentrated on the threaded section 21 in the middle, which would lead to uneven heat exchange and thus unsatisfactory heat exchange effect.

[0077] Example 2

[0078] like Figure 3-5As shown in the figure, this embodiment introduces a shell-and-tube heat exchanger, which includes an inner tube 22 and an outer tube 11 sleeved outside the inner tube 2. The inner tube 2 is provided with a heat exchange column 5 and a connecting part 51. The heat exchange column 5 is fixed to the inner tube 2 through the connecting part 51 and is suspended in the middle of the inner tube 2.

[0079] Specifically, the heat exchange column 5 extends along the extension direction of the inner tube 2, and its outer wall is spaced apart from the inner tube 2 wall to allow the heat exchange medium to flow. At least one connection part 51 is provided along the extension direction of the heat exchange column 5.

[0080] Specifically, when there is only one connection part 51, it is located in the middle of the heat exchange column 5. On the one hand, it can make the supporting force more evenly distributed in the structure, reduce local pressure, and improve the stability and load-bearing capacity of the structure. On the other hand, setting the support point in the middle can effectively increase the stiffness of the structure, improve the bending stiffness and torsional stiffness of the structure, and make the structure more robust and stable.

[0081] Preferably, there are two connecting parts 51, which are set at both ends of the heat exchange column 5. This can increase the structural stability and prevent it from bending or deforming when subjected to external forces; help to disperse the pressure at both ends of the heat exchange column 5, reduce local stress concentration, and reduce the risk of damage; improve the load-bearing capacity, enabling it to withstand greater loads and extend its service life; and reduce vibration and noise, improving the comfort and stability of use.

[0082] Specifically, the connecting part 51 includes a connecting body 511 and a connecting arm 512. The connecting body 511 is circular and is coaxially arranged with the heat exchange column 5. The diameter of the connecting body 511 is greater than or equal to the diameter of the heat exchange column 5. The connecting arm 512 extends from the outer edge of the connecting body 511 in a direction away from the axis of the connecting body 511 and is connected to the wall of the inner tube 2.

[0083] Preferably, the diameter of the connecting body 511 is larger than the diameter of the heat exchange column 5. This way, when the heat exchange medium passes through the connecting body 511, there is a height difference between the outer periphery of the connecting body 511 and the outer periphery of the heat exchange column 5, which will generate strong convection in the heat exchange medium and promote the circulation energy to further improve the heat exchange effect.

[0084] Specifically, one or more connecting arms 512 can be provided. When only one is provided, the connecting arm 512, the connecting body 511, and the inner tube 2 are integrally formed. The heat exchange column 5 is suspended in the middle of the inner tube 2 through the connecting arm 512. However, this method puts a lot of pressure on the connecting arm 512. On the one hand, with the increase of the usage time, the connecting arm 512 will wear out, reducing the limiting effect on the heat exchange column 5. On the other hand, the connecting arm 512 is integrally formed with the inner tube 2, which is not conducive to the disassembly of the heat exchange column 5. When abnormal problems occur in the inner tube 2, it is not conducive to maintenance.

[0085] Preferably, multiple connecting arms 512 are arranged at even intervals along the circumference of the heat exchange column 5. This improves stability, as multiple connecting arms 512 provide more support for the heat exchange column 5, thus increasing its stability. When one connecting arm 512 is subjected to external force, the other connecting arms 512 can work together to reduce the swaying or tilting of the heat exchange column 5. Furthermore, it increases balance, as multiple connecting arms 512 can be evenly distributed around the outer periphery of the connecting body 511, making it easier for the heat exchange column 5 to maintain balance under external force. If there is only one connecting arm 512, the heat exchange column 5 is prone to tilting to one side, while multiple connecting arms 512 allow for more even force distribution, reducing tilting. Simultaneously, the arrangement of multiple connecting arms 512, while ensuring the heat exchange column 5 is located in the middle of the inner tube 2, allows for placement that abuts against the inner tube 2 wall. Compared to being integrally formed with the inner tube 2 wall, this facilitates disassembly of the heat exchange column 5 and makes maintenance easier when abnormalities occur in the inner tube 2.

[0086] Specifically, when the connecting part 51 abuts against the wall of the inner tube 2, the flow of the heat exchange medium will cause the heat exchange column 5 to shift, which will cause the connecting arm 512 to scratch the wall of the inner tube 2 and affect the service life of the inner tube 2. In this embodiment, a blocking part 23 is provided on the wall of the inner tube 2, extending in the radial direction of the inner tube 2 and towards the axis of the inner tube 2. The blocking part 23 is located downstream of the connecting part 51 along the flow direction of the heat exchange medium and abuts against the connecting arm 512. This can prevent the heat exchange column 5 from moving in the inner tube 2 when the heat exchange medium flows, and play the role of fixing the heat exchange column 5.

[0087] like Figure 6 As shown, a connecting part 51 is provided at each end of the heat exchange column 5, and a descaling ball 4 is also provided between the two connecting parts 51; the heat exchange column 5 is coaxial with the inner tube 2, and the difference between the inner radius of the inner tube 2 and the radius of the connecting part 51 is less than the diameter of the descaling ball 4.

[0088] Specifically, heat exchangers accumulate scale over long periods of operation, and manual cleaning is time-consuming and labor-intensive. Therefore, descaling balls 4 are installed inside the pipes. Driven by the heat exchange medium, the descaling balls 4 collide with the inner wall of the pipes, knocking the scale off and achieving automatic descaling.

[0089] Specifically, the heat exchange column 5 is coaxial with the inner tube 2, making the space between the heat exchange column 5 and the inner tube 2 more uniform. Multiple connecting parts 51 can be provided and arranged at intervals along the heat exchange column 5. The descaling ball 4 is placed between two adjacent connecting parts 51. At the same time, the difference between the inner radius of the inner tube 2 and the radius of the connecting part 51 is less than the diameter of the descaling ball 4, so as to limit the descaling ball 4 and prevent the descaling ball 4 from accumulating together under the flow of heat exchange medium, thus avoiding the problem of ineffective and uniform descaling.

[0090] Specifically, the diameter of the descaling ball 4 should be smaller than the distance between the outer periphery of the heat exchange column 5 and the wall of the inner tube 2. In this embodiment, it is preferable that the diameter of the descaling ball 4 is half the distance between the outer periphery of the heat exchange column 5 and the wall of the inner tube 2. This way, the descaling ball 4 has enough space to move and collide with the tube wall. On the other hand, since the diameter of the descaling ball 4 should be larger than the difference between the inner radius of the inner tube 2 and the radius of the connecting part 51, the diameter of the descaling ball 4 should not be set too small to avoid reducing the flow rate of the heat exchange medium at both ends of the heat exchange column 5.

[0091] Specifically, the outer periphery of the heat exchanger is provided with at least a threaded portion 513, and the threaded portion 513 is provided with an annular groove that is recessed towards the axis of the heat exchange column 5. The annular groove is spiral-shaped and extends along the axial direction of the heat exchange column 5.

[0092] Specifically, the threaded structure effectively increases the heat transfer surface area, thereby improving heat exchange efficiency. For the same volume, the heat transfer area of ​​a threaded pipe is larger than that of a regular pipe, which better promotes heat transfer and exchange. The threaded structure increases fluid flow disturbance, creating turbulence within the pipe, thus improving heat transfer. In turbulent flow, the fluid has a higher heat transfer coefficient and higher heat transfer efficiency. The threaded structure creates multiple tiny vortices on the inner wall of the pipe, increasing the contact area of ​​the heat transfer interface and enhancing convective heat transfer, thereby improving heat transfer performance. Furthermore, the threaded structure reduces the risk of scaling and clogging because it minimizes fluid accumulation and deposition within the pipe, reducing the likelihood of scaling and clogging and maintaining stable heat exchange efficiency.

[0093] Specifically, the pipe section corresponding to the inner tube 2 and the heat exchange column 5 is at least partially configured as a threaded section 21; the threaded section 21 is provided with an annular groove that is recessed towards the axis of the inner tube 2, and the annular groove is spiral-shaped and extends along the axial direction of the inner tube 2; the threaded section 21 is arranged opposite to the threaded part 513.

[0094] Specifically, the threaded section 21 on the inner tube 2 is also designed to improve heat transfer efficiency, inhibit scaling and contamination, and reduce fluid resistance, thereby improving the performance of the heat exchanger. The threaded section 21 is set in correspondence with the threaded part 513, which can further improve the eddy current effect of the heat exchange medium between the threaded part 513 and the threaded section 21, thereby improving the heat exchange efficiency.

[0095] Specifically, the inner tube 2 also includes an extension section 22, which is disposed at both ends of the threaded section 21. The tube wall of the extension section 22 extends along the extension direction of the inner tube 2, and the heat exchange column 5 is at least partially located within the extension section 22.

[0096] Specifically, the extension section 22 is a smooth wall surface, allowing the heat exchange medium to flow smoothly within it. The presence of the heat exchange column 5 will have a certain impact on the flowability of the heat exchange medium. By partially placing the heat exchange column 5 within the extension section 22, it can ensure that the flow of the heat exchange medium is relatively stable before contacting the heat exchange column 5, thereby improving the flow rate of the heat exchange medium in the section corresponding to the heat exchange column 5. If the heat exchange column 5 is entirely located within the threaded section 21, turbulence will occur before the heat exchange medium contacts the heat exchange column 5, due to the influence of the threaded section 21, which is not conducive to the smooth flow of the heat exchange medium.

[0097] Specifically, when multiple connecting parts 51 are provided, the spacing between the connecting parts 51 corresponding to the threaded section 21 should be smaller than the spacing between some connecting parts 51. Since the wall surface of the threaded section 21 is uneven, more dirt will accumulate in this part and be more difficult to clean. Therefore, the distance between two adjacent connecting parts 51 should be reduced to make the impact between the descaling ball 4 and the pipe wall more intense, thereby achieving a better descaling effect. Alternatively, more descaling balls 4 can be provided between two adjacent connecting parts 51 corresponding to the threaded section 21 to achieve a better descaling effect.

[0098] Specifically, the outer tube 1 has an outer tube interface 11 that communicates with the outer tube 1 on its wall. The outer tube interface 11 extends radially along the outer tube 1, and one end of the outer tube interface 11 near its axis corresponds to the middle of the extension section 22.

[0099] Specifically, the outer pipe interface 11 communicates with the space between the outer pipe 1 and the inner pipe 2, allowing for the flow of another heat exchange medium. The flow direction of the heat exchange medium between the outer pipe 1 and the inner pipe 2 is opposite to the flow direction in the inner pipe 2. On one hand, the opposite flow direction increases the heat exchange surface area, thereby improving heat exchange efficiency. When the flow rates and temperature differences between the two media are large, using opposite flow directions allows for more efficient utilization of heat conduction, resulting in higher heat exchange efficiency. On the other hand, the opposite flow direction reduces the temperature difference between the two media. This reduces heat loss and improves energy utilization efficiency. By aligning the outer pipe interface 11 with the middle of the extension section 22, the contact time between the heat exchange medium between the outer pipe 1 and the inner pipe 2 and the heat exchange medium in the heat exchange column 5 section of the inner pipe 2 can be extended, further improving heat exchange efficiency.

[0100] Example 3

[0101] like Figure 7 As shown, in this embodiment, the above-mentioned Embodiment 1 and Embodiment 2 are combined. Based on the descaling structure, the heat exchange column 5 is installed in the middle of the baffle 3. At this time, the baffle 3 is equivalent to the connecting part, which plays the role of fixing the heat exchange column 5 and ensuring the flow of heat exchange medium in the inner tube 2.

[0102] Specifically, multiple baffles 3 are arranged at intervals along the extension direction of the inner tube 2, and multiple descaling balls 4 are set between two adjacent baffles 3. The diameter of the descaling balls 4 is smaller than the distance between the outer periphery of the heat exchange column 5 and the wall of the inner tube 2. In this embodiment, the flow of the heat exchange medium is ensured by the hollow holes 33 in the baffles 3. Therefore, the requirement for the diameter of the descaling balls 4 is not high. The displacement of the descaling balls 4 can be limited by changing the maximum width of the hollow holes 33.

[0103] Preferably, at the position corresponding to the threaded portion 513 and the threaded section 21, the distance between two adjacent baffles 3 is smaller than the distance between two adjacent baffles 3 corresponding to the extension section, or the number of descaling balls 4 is increased between two adjacent baffles 3 at the position corresponding to the threaded portion 513 and the threaded section 21 to ensure the descaling effect.

[0104] Specifically, baffles 3 are installed at both ends of the inner tube 2, and descaling balls 4 are installed between the baffles 3 at both ends of the inner tube 2 and the two ends of the heat exchange column 5. Since the tube wall in this part is relatively smooth, less dirt is generated. Therefore, in order to save costs, the number of descaling balls 4 can be appropriately reduced in this part.

[0105] Example 4

[0106] In this embodiment, the heat exchange column 5 is configured as multiple segments, and the multiple heat exchange columns 5 are arranged at intervals along the extension direction of the inner tube 2. Each heat exchange column 5 has a connecting part 51 at both ends, and each heat exchange column 5 is installed in the inner tube 2 through the connecting parts 51 at both ends.

[0107] In this embodiment, multiple heat exchange columns 5 are spaced apart along the extension direction of the inner tube 2, and a descaling ball 4 is provided in the inner tube 2 between each two adjacent heat exchange columns 5. The diameter of the descaling ball 4 is greater than the distance between the connecting body 511 of the connecting part 51 and the wall of the inner tube 2.

[0108] Therefore, while ensuring heat exchange efficiency, the complexity of the heat exchange medium flow can be increased, which can increase the impact effect of the heat exchange medium on the descaling balls and improve the descaling effect.

[0109] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present utility model. The implementation schemes in the above embodiments can be further combined or replaced. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A shell-and-tube heat exchanger, comprising an inner tube (2) and an outer tube (1) sleeved outside the inner tube (2), wherein the inner tube (2) is provided with a descaling structure, characterized in that, The descaling structure includes: Baffles (3) are installed inside the inner tube (2), and their circumference is connected to the wall of the inner tube (2). Multiple baffles (3) are arranged at intervals along the extension direction of the inner tube (2). A perforated hole (33) is provided in the middle of the baffles (3) for the heat exchange medium to flow. The descaling ball (4) is placed between two adjacent baffles (3) and its diameter is greater than the maximum width of the perforated hole (33).

2. The shell-and-tube heat exchanger according to claim 1, characterized in that, The baffle (3) includes: The blocking ring (32) includes multiple rings arranged coaxially and radially spaced, and the width between two adjacent blocking rings (32) is smaller than the diameter of the descaling ball (4); The support arm (31) is connected between two adjacent blocking rings (32).

3. A shell-and-tube heat exchanger according to claim 2, characterized in that, The diameter of the innermost retaining ring (32) is smaller than the diameter of the descaling ball (4); Alternatively, the diameter of the innermost blocking ring (32) is greater than or equal to the diameter of the descaling ball (4), and a blocking arm is provided on the inner circumference of the innermost blocking ring (32) so that the maximum width of the hollow hole (33) on the inner circumference of the innermost blocking ring (32) is less than the diameter of the descaling ball (4).

4. A shell-and-tube heat exchanger according to claim 3, characterized in that, The blocking arms are either cross-shaped or grid-shaped.

5. A shell-and-tube heat exchanger according to claim 3, characterized in that, The outer periphery of the outermost blocking ring (32) is spaced apart from the wall of the inner tube (2), and the maximum width between the wall of the inner tube (2) and the outermost blocking ring (32) is less than the diameter of the descaling ball (4). The outermost blocking ring (32) is provided with a support arm (31) on its outer periphery, and the baffle (3) is connected to the wall of the inner tube (2) through the support arm (31).

6. A shell-and-tube heat exchanger according to claim 1, characterized in that, The baffle (3) is perpendicular to the extension direction of the inner tube (2).

7. A shell-and-tube heat exchanger according to any one of claims 1-6, characterized in that, The outer tube (1) and the inner tube (2) are coaxially arranged. The inner diameter of the outer tube (1) is greater than the outer diameter of the inner tube (2), and the extension length of the outer tube (1) is less than the extension length of the inner tube (2). The baffle (3) is set in the pipe section corresponding to the inner pipe (2) and the outer pipe (1), and the baffle (3) at both ends of the inner pipe (2) is set at the position corresponding to the two ends of the outer pipe (1).

8. A shell-and-tube heat exchanger according to claim 7, characterized in that, The pipe sections corresponding to the inner pipe (2) and the outer pipe (1) are at least partially set as threaded sections (21); The wall of the threaded section (21) is provided with an annular groove that is recessed toward the axis of the inner tube (2). The annular groove is spiral-shaped and extends along the axial direction of the inner tube (2).

9. A shell-and-tube heat exchanger according to claim 8, characterized in that, The interval between two adjacent baffles (3) in the threaded section (21) is less than or equal to the interval between two adjacent baffles (3) in the inner tube (2) section outside the threaded section (21); The axial length of the inner wall of the inner tube (2) between two adjacent annular grooves is equal to the width of the bottom of the annular groove.

10. A shell-and-tube heat exchanger according to claim 9, characterized in that, The cross-section of the annular groove is an isosceles trapezoid.

11. A shell-and-tube heat exchanger according to claim 9, characterized in that, Multiple descaling balls (4) are provided between two adjacent baffles (3).

12. A shell-and-tube heat exchanger according to claim 11, characterized in that, The number of descaling balls (4) between two adjacent baffles (3) in the threaded section (21) is greater than or equal to the number of descaling balls (4) between two adjacent baffles (3) in the inner pipe (2) outside the threaded section (21).

13. A shell-and-tube heat exchanger according to claim 8, characterized in that, The pipe section corresponding to the inner pipe (2) and the outer pipe (1) also includes an extension section (22). The extension section (22) is set at both ends of the threaded section (21), and the pipe wall of the extension section (22) extends along the extension direction of the inner pipe (2). The outer tube (1) has an outer tube interface (11) that communicates with the outer tube (1). The outer tube interface (11) extends radially along the outer tube (1), and one end of the outer tube interface (11) near its axis corresponds to the middle of the extension section (22).

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