Heat exchanger with self-cleaning function

Abstract

The utility model relates to a kind of heat exchanger with self-cleaning function, including shell, upper cover and lower cover respectively sealed installation in the top and bottom of shell and detachably installed heat exchange tube assembly in the inside of shell, further including cleaning assembly, the cleaning assembly is set on all heat exchange tube, for the lifting type brush washing and flushing to the outer surface of heat exchange tube;Upper cover top and lower cover bottom are equipped with tube pass medium inlet and tube pass medium outlet respectively, the top of shell one side is equipped with shell pass medium inlet, the bottom of other side is equipped with shell pass medium outlet.The utility model, integrated brush washing and high-pressure water flushing double function, can be carried out full-course dead angle cleaning along heat exchange tube axial, especially for the effect of heat exchange tube gap and tube bundle center area is remarkable, cleaning is thorough and efficient.The structure can complete cleaning without disassembling heat exchange tube, degree of automation is high, greatly reduce maintenance time and labor intensity, effectively improve the comprehensive performance and service life of heat exchanger.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger equipment technology, and in particular to a heat exchanger with self-cleaning function. Background Technology

[0002] Heat exchangers are critical equipment widely used in industrial processes to achieve heat exchange between different media. During long-term operation, especially when the shell-side medium contains fouling-prone components (such as scale formed after repeated heating and circulation of groundwater), fouling easily accumulates on the outer surface of the heat exchange tubes. Fouling significantly reduces heat exchange efficiency, increases fluid resistance, and in severe cases, can even lead to corrosion and perforation, shortening service life, increasing maintenance costs, and increasing the risk of production downtime. Several solutions for cleaning heat exchangers exist in the prior art. For example, Chinese utility model patent CN 222231373 U discloses a heat exchanger with a built-in cleaning function. It has cleaning tubes arranged inside the shell, with nozzles on the tubes, which can clean the shell-side interior or provide auxiliary heating by introducing a cleaning medium or high-temperature steam. This design improves the problems of scaling and slow start-up temperature rise to some extent, but it still has limitations: its cleaning structure is a fixed tube arrangement, which may result in dead corners in the cleaning coverage, especially in the central area of ​​densely arranged heat exchange tube bundles; at the same time, the solution lacks physical scrubbing function and relies only on fluid jet, which has limited effect on removing firmly attached hard scale. Summary of the Invention

[0003] The present invention aims to address the shortcomings of the prior art by providing a heat exchanger with a self-cleaning function.

[0004] To achieve the above objectives, this utility model adopts the following technical solution: a heat exchanger with self-cleaning function, comprising a shell, an upper cover and a lower cover respectively sealed and installed at the top and bottom of the shell, and a heat exchange tube assembly detachably installed inside the shell. The heat exchange tube assembly includes a plurality of heat exchange tubes arranged in a rectangular array, an upper connecting plate sleeved and fixed to the top of all heat exchange tubes, and a lower connecting plate at the bottom. The upper connecting plate is sealed and bolted to the top of the shell by a flange, and the upper cover is sealed and bolted to the upper connecting plate. A support plate is provided at the bottom of the shell, and the lower connecting plate is sealed and bolted to the support plate. The support plate is provided with a plurality of through holes communicating with the heat exchange tubes.

[0005] It also includes a cleaning component, which is fitted onto all heat exchange tubes and is used to perform lifting and rinsing of the outer surface of the heat exchange tubes.

[0006] The top of the upper cover and the bottom of the lower cover are respectively provided with a tube-side medium inlet and a tube-side medium outlet. The top of one side of the shell is provided with a shell-side medium inlet, and the bottom of the other side is provided with a shell-side medium outlet.

[0007] Specifically, valves are installed at the inlet of the tube-side medium, the outlet of the tube-side medium, the inlet of the shell-side medium, and the outlet of the shell-side medium.

[0008] Specifically, the cleaning component includes a water spray pipe and a cleaning brush concentrically mounted on the outside of the heat exchange tube in a circular shape. Connecting rods are provided between the two sides of the cleaning brush and the two sides of the top of the water spray pipe. Several nozzles are provided on the inner wall of the water spray pipe. Water inlet branch pipes are provided on the front and rear sides of the water spray pipe, and the front and rear sides of the water spray pipe are provided with a first water inlet connected to the water inlet branch pipe. A main water inlet pipe is connected to both sides of all the water inlet branch pipes. A lifting mechanism for driving the cleaning component to rise and fall and a water inlet mechanism connected to the main water inlet pipe are provided on the upper connecting plate.

[0009] Specifically, the lifting mechanism includes lifting rods fixed to the front and rear sides of the main water inlet pipe, and hydraulic cylinders that drive the lifting rods to rise and fall are installed on the front and rear sides of the top of the upper connecting plate.

[0010] Specifically, the water inlet mechanism includes sleeves fixed to both sides of the top of the upper connecting plate, and the sleeves seal through the upper connecting plate. A corrugated expansion pipe is connected between the top of the sleeve and the main water inlet pipe. The top of the sleeve is provided with a second water inlet connected to the corrugated expansion pipe, and the second water inlet is connected to a water source for cleaning.

[0011] Specifically, the lifting rod and the main water inlet pipe are equipped with cleaning wipes that contact the inner wall of the housing on the side facing the housing.

[0012] The beneficial effects of this utility model are:

[0013] This invention integrates brushing and high-pressure water rinsing functions through a liftable cleaning component, enabling thorough cleaning along the entire axial direction of the heat exchange tubes without any blind spots. It is particularly effective in the gaps between heat exchange tubes and the central area of ​​the tube bundle, resulting in a thorough and efficient cleaning. The cleaning wipe design also allows for simultaneous cleaning of the inner wall of the shell. This structure can complete cleaning without disassembling the heat exchange tubes, offering a high degree of automation, significantly reducing maintenance time and labor intensity, and effectively improving the overall performance and service life of the heat exchanger. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0016] Figure 3 for Figure 1 Enlarged view of point B in the middle;

[0017] Figure 4 This is a schematic diagram of the cleaning component structure of this utility model;

[0018] Figure 5 for Figure 4Enlarged diagram at point C;

[0019] Figure 6 This is a schematic diagram showing the connection between the upper cover and the upper connecting plate of this utility model;

[0020] In the diagram: 1-Shell; 2-Upper cover; 3-Lower cover; 4-Heat exchange tube; 5-Upper connecting plate; 6-Lower connecting plate; 7-Support plate; 8-Tube-side medium inlet; 9-Tube-side medium outlet; 10-Shell-side medium inlet; 11-Shell-side medium outlet; 12-Water spray pipe; 13-Cleaning brush; 14-Connecting rod; 15-Nozzle; 16-Water inlet branch pipe; 17-First water inlet; 18-Main water inlet pipe; 19-Lifting rod; 20-Hydraulic cylinder; 21-Sleeve; 22-Corrugated telescopic pipe; 23-Second water inlet;

[0021] The following will describe in detail the embodiments of this utility model with reference to the accompanying drawings. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0023] like Figures 1-6 As shown, a heat exchanger with a self-cleaning function includes a shell 1, an upper cover 2 and a lower cover 3 respectively sealed and installed at the top and bottom of the shell 1, and a heat exchange tube assembly detachably installed inside the shell 1. The heat exchange tube assembly includes a plurality of heat exchange tubes 4 arranged in a rectangular array, an upper connecting plate 5 sleeved and fixed to the top of all heat exchange tubes 4, and a lower connecting plate 6 at the bottom. The upper connecting plate 5 is sealed and bolted to the top of the shell 1 by a flange, and the upper cover 2 is sealed and bolted to the upper connecting plate 5. A support plate 7 is provided at the bottom of the shell 1, and the lower connecting plate 6 is sealed and bolted to the support plate 7. The support plate 7 has a plurality of through holes communicating with the heat exchange tubes 4. The top of the upper cover 2 and the bottom of the lower cover 3 are respectively provided with a tube-side medium inlet 8 and a tube-side medium outlet 9. A shell-side medium inlet 10 is provided on the top of one side of the shell 1, and a shell-side medium outlet 11 is provided on the bottom of the other side. Valves are provided on the tube-side medium inlet 8, the tube-side medium outlet 9, the shell-side medium inlet 10, and the shell-side medium outlet 11.

[0024] The heat exchanger tube assembly (including heat exchanger tubes 4, upper connecting plate 5, and lower connecting plate 6) is detachably installed inside the shell 1. This design allows the entire tube bundle to be assembled and disassembled as a whole, greatly facilitating subsequent maintenance, cleaning, or replacement work, and reducing downtime and maintenance complexity. Through multiple sealing designs, such as the "flange sealing bolt connection" between the upper connecting plate 5 and the top of the shell 1, the "sealing bolt connection" between the upper cover 2 and the upper connecting plate 5, and the "sealing bolt connection" between the lower connecting plate 6 and the support plate 7, the sealing between the two independent fluid channels on the tube side and the shell side, as well as with the outside environment, is ensured, preventing media leakage and crosstalk, and guaranteeing the stability and safety of the heat exchange process.

[0025] It also includes a cleaning component, which is fitted onto all heat exchange tubes 4 and is used to perform lifting and rinsing of the outer surface of the heat exchange tubes 4. The cleaning component includes a water spray pipe 12 and a cleaning brush 13 concentrically fitted on the outside of the heat exchange tubes 4 in a circular shape. A connecting rod 14 is provided between the two sides of the cleaning brush 13 and the two sides of the top of the water spray pipe 12. Several nozzles 15 are provided on the inner wall of the water spray pipe 12. Water inlet branch pipes 16 are provided on the front and rear sides of the water spray pipe 12, and the front and rear sides of the water spray pipe 12 are provided with first water inlets 17 connected to the water inlet branch pipes 16. Water inlet main pipes 18 are connected to both sides of all water inlet branch pipes 16. The upper connecting plate 5 is provided with a lifting mechanism for driving the cleaning component to lift and lower, and a water inlet mechanism connected to the water inlet main pipe 18.

[0026] The cleaning assembly integrates two functions: "lifting brushing" and "rinsing." Mechanical brushing (cleaning brush 13) effectively removes firmly attached hard-to-reach dirt, while high-pressure rinsing (water spray pipe 12 and nozzle 15) washes away debris and cleans small gaps. The combined effect of these two methods achieves a deep cleaning result greater than the sum of its parts, far exceeding the performance of a single cleaning method. The cleaning assembly is "concentrically mounted on the outside of all heat exchange tubes 4." Its ring design and layout covering all heat exchange tubes, combined with the lifting motion, ensure that the entire outer surface of each heat exchange tube 4 is covered by the cleaning brush 13 and the rinsing water flow, completely eliminating cleaning blind spots. The water spray pipe 12 and cleaning brush 13 are connected as a whole by the connecting rod 14 and form an orderly flow channel network through the water inlet branch pipe 16 and the main water inlet pipe 18. This design makes the complex cleaning system compact, well-organized, and easy to install and maintain.

[0027] The lifting mechanism includes lifting rods 19 fixed to the front and rear sides of the main water inlet pipe 18. Hydraulic cylinders 20 for driving the lifting rods 19 to rise and fall are installed on the front and rear sides of the top of the upper connecting plate 5. The lifting rods 19 and the main water inlet pipe 18 are provided with cleaning wipes that contact the inner wall of the housing 1 on the side facing the inner wall of the housing 1. The water inlet mechanism includes sleeves 21 fixed to the top sides of the upper connecting plate 5, and the sleeves 21 seal through the upper connecting plate 5. A corrugated telescopic pipe 22 is connected between the top of the sleeve 21 and the main water inlet pipe 18. The top of the sleeve 21 is provided with a second water inlet 23 connected to the corrugated telescopic pipe 22. The second water inlet 23 is connected to a water source for cleaning.

[0028] The corrugated telescopic tube 22 can flexibly extend and retract to adapt to the lifting and lowering movement of the cleaning component, while maintaining a reliable seal at all times. This perfectly solves the fluid delivery problem under dynamic components and ensures an uninterrupted supply of high-pressure cleaning fluid during operation. The lifting rod 19 and the main water inlet pipe 18 are equipped with "cleaning wipes," which allow the cleaning component to automatically and synchronously scrape and clean the inner wall of the housing 1 while cleaning the heat exchange tubes through its up-and-down movement. This achieves a comprehensive, one-time cleaning of all surfaces in the heat exchange space, improving overall cleaning efficiency.

[0029] When this invention is in operation, if cleaning is required, the shell-side medium inlet and outlet valves are closed. Cleaning fluid or high-pressure water is introduced into the second inlet 23 via an external water source. The water flows through the corrugated expansion pipe 22, the main inlet pipe 18, and the branch inlet pipe 16, finally exiting from the nozzle 15 of the spray pipe 12 to rinse the outer wall of the heat exchange tube 4. Simultaneously, the hydraulic cylinder 20 is activated to drive the lifting rod 19, causing the entire cleaning assembly (spray pipe 12, cleaning brush 13, cleaning wipe, etc.) to slowly move up and down along the axial direction of the heat exchange tube 4. During this process, the cleaning brush 13 mechanically scrubs the outer wall of the heat exchange tube 4, while the cleaning wipe scrapes the inner wall of the shell 1, thus achieving comprehensive and automatic cleaning. The cleaned wastewater can be discharged from the shell-side medium outlet 11.

[0030] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any improvements made using the inventive concept and technical solution of the present invention, or direct application to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A heat exchanger with a self-cleaning function, comprising a shell (1), an upper cover (2) and a lower cover (3) respectively sealed and installed at the top and bottom of the shell (1), and a heat exchange tube assembly detachably installed inside the shell (1), characterized in that: The heat exchange tube assembly includes several heat exchange tubes (4) arranged in a rectangular array, an upper connecting plate (5) sleeved and fixed to the top of all heat exchange tubes (4), and a lower connecting plate (6) at the bottom; the upper connecting plate (5) is sealed and bolted to the top of the shell (1) by a flange, the upper cover (2) is sealed and bolted to the upper connecting plate (5), a support plate (7) is provided at the bottom of the shell (1), the lower connecting plate (6) is sealed and bolted to the support plate (7), and the support plate (7) is provided with several through holes communicating with the heat exchange tubes (4); It also includes a cleaning component, which is fitted on all heat exchange tubes (4) and is used to perform lifting and rinsing of the outer surface of the heat exchange tubes (4); The top of the upper cover (2) and the bottom of the lower cover (3) are respectively provided with a tube-side medium inlet (8) and a tube-side medium outlet (9). The top of one side of the shell (1) is provided with a shell-side medium inlet (10), and the bottom of the other side is provided with a shell-side medium outlet (11).

2. A heat exchanger with self-cleaning function according to claim 1, characterized in that, Valves are provided on the pipe-side medium inlet (8), pipe-side medium outlet (9), shell-side medium inlet (10), and shell-side medium outlet (11).

3. A heat exchanger with self-cleaning function according to claim 1, characterized in that, The cleaning assembly includes a water spray pipe (12) and a cleaning brush (13) concentrically sleeved on the outside of the heat exchange tube (4) in a circular shape. A connecting rod (14) is provided between the two sides of the cleaning brush (13) and the two sides of the top of the water spray pipe (12). Several nozzles (15) are provided on the inner wall of the water spray pipe (12). Water inlet branch pipes (16) are provided on the front and rear sides of the water spray pipe (12), and the front and rear sides of the water spray pipe (12) are provided with a first water inlet (17) connected to the water inlet branch pipe (16). Water inlet main pipes (18) are connected to both sides of all water inlet branch pipes (16). The upper connecting plate (5) is provided with a lifting mechanism for driving the cleaning assembly to rise and fall, and a water inlet mechanism connected to the water inlet main pipe (18).

4. A heat exchanger with self-cleaning function according to claim 3, characterized in that, The lifting mechanism includes lifting rods (19) fixed to the front and rear sides of the water inlet main pipe (18), and hydraulic cylinders (20) that drive the lifting rods (19) to lift are installed on the front and rear sides of the top of the upper connecting plate (5).

5. A heat exchanger with self-cleaning function according to claim 3, characterized in that, The water inlet mechanism includes sleeves (21) fixed to both sides of the top of the upper connecting plate (5), and the sleeves (21) seal through the upper connecting plate (5). A corrugated expansion pipe (22) is connected between the top of the sleeve (21) and the main water inlet pipe (18). The top of the sleeve (21) is provided with a second water inlet (23) connected to the corrugated expansion pipe (22). The second water inlet (23) is connected to a water source for cleaning.

6. A heat exchanger with self-cleaning function according to claim 4, characterized in that, The lifting rod (19) and the water inlet pipe (18) are provided with cleaning wipes that contact the inner wall of the housing (1) on the side facing the inner wall of the housing (1).

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