Heat exchanger with self-cleaning structure

Abstract

The utility model relates to the technical field of heat exchangers, and discloses a heat exchanger with a self-cleaning structure, which comprises a pipe mounting rack and an inner circulating pipe fixed on the pipe mounting rack, the inner circulating pipe is a communicated pipeline formed by connecting a plurality of straight pipes and U-shaped pipes, and the inner circulating pipe is provided with a self-cleaning structure. Outer circulation pipes are fixedly arranged outside the straight pipes forming the inner circulation pipe in a sleeving mode, and the adjacent outer circulation pipes are communicated through outer circulation series connection pipes to form a communicated pipe body. In a high-heat pipeline, the water circulation wall scraping roller is driven by water flow to rotate, and then the rubber scraping plate is driven to continuously sweep and scrape the inner wall of the inner circulation pipe, so that the wall thickness of the inner circulation pipe can be effectively prevented from being increased, and the heat exchange efficiency of the inner circulation pipe is effectively prevented from being reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, in particular to a heat exchanger with a self-cleaning structure. Background Art

[0002] Shell and tube heat exchanger is one of the most commonly used heat exchanger structures. The heat exchanger with the most basic structure is composed of a heat exchanger shell and heat exchange tubes connected to it. One fluid flows in the shell, and another fluid flows in the heat exchange tube. The two fluids flush the inner and outer walls of the heat exchange tube respectively. The heat of the higher temperature fluid is transferred to the other lower temperature fluid through conduction of the tube wall.

[0003] In practical engineering applications, the fluid flowing in the heat exchange tube usually inevitably contains dust, particles and other pollutants that are easily deposited on the tube wall. When the heat exchanger is running, after a period of accumulation, a certain degree of pollutants are often deposited on the tube wall of the heat exchange tube. The deposition of these pollutants will hinder the heat exchange between the fluids on both sides of the tube wall. On the other hand, the deposited pollutants will adhere to the tube wall for a long time to form dirt, and the dirt is very easy to cause corrosion to the metal tube wall (i.e. typical under-deposit corrosion).

[0004] At present, the common countermeasure for dirt in the tube is to shut down the machine regularly for manual cleaning, including water cleaning and mechanical cleaning, which is time-consuming and labor-intensive. At the same time, the cleaning process will also cause a certain degree of damage to the wall of the heat exchange tube; before cleaning, the heat transfer will usually drop significantly, the heat exchanger efficiency will be reduced and cannot meet the process requirements, affecting the output or quality of the process products; the corrosion of the tube will increase significantly, greatly reducing the service life of the heat exchanger; especially when shutting down for cleaning, it will affect the continuity of the production process and cause a loss in production efficiency. At present, no effective solution has been proposed for the above problems. Utility Model Content

[0005] The technical problem to be solved by the utility model is: in order to overcome the above problems, a heat exchanger with a self-cleaning structure is provided, which solves the above problems.

[0006] The utility model solves the technical problem by adopting the following technical solutions:

[0007] A heat exchanger with a self-cleaning structure comprises a tube mounting frame and an inner circulation pipe fixed on the tube mounting frame, wherein the inner circulation pipe is connected by a plurality of straight tubes and U-shaped tubes to form a connected pipeline, and an outer circulation pipe is fixedly arranged outside the straight tubes constituting the inner circulation pipe, and the adjacent outer circulation pipes are connected in the middle by an outer circulation series pipe to form a mutually connected pipe body;

[0008] A water circulation scraper roller is also provided in the straight pipe of the inner circulation pipe, and its two ends are rotatably arranged between flanges and can rotate in the inner circulation pipe. The side of the water circulation scraper roller is provided with a component that can scrape the inner wall of the inner circulation pipe when rotating, thereby scraping off thermal scale during the heat exchange cycle, thereby avoiding the continuous increase in the wall thickness of the inner circulation pipe and thus causing a decrease in its heat exchange efficiency.

[0009] Preferably, the water circulation scraping roller includes a rotating shaft with an outer wall surrounding a spiral blade. The spiral blade drives the rotating shaft to rotate after being impacted by a unidirectional water flow, thereby causing the scraping component arranged on the rotating shaft to rotate to clean the inner wall of the inner circulation pipe.

[0010] Preferably, a spring telescopic support rod is welded and fixed on the outer side wall of the rotating shaft, and a metal clamp is fixed on the spring telescopic support rod, so that the metal clamp can be pressed against the inner wall of the inner circulation pipe for scraping under the elastic expansion and contraction of the spring telescopic support rod, and the metal clamp can be retracted by the elasticity of the spring telescopic support rod to avoid interference and jamming.

[0011] Preferably, a rubber scraper is fixedly mounted on the outer wall of the metal clamp plate and pressed against the inner wall of the inner circulation pipe. The material characteristics of the rubber scraper can better protect the inner wall of the inner circulation pipe while performing the sweeping and scraping. Moreover, the cost of replacing the rubber scraper after wear is simpler and convenient to replace.

[0012] Preferably, flange clips are provided at both ends of the rotating shaft, wherein screw holes are provided at the outer annular intervals of the flange clips, the flange clips are arranged between the flange plates between the straight pipe and the U-shaped pipe constituting the inner circulation pipe and are fixed by bolts, a spoke plate is welded and fixed in the flange clip and a bearing seat is fixed in the middle of the spoke plate, a bearing is embedded and fixed in the bearing seat, and the two ends of the rotating shaft are connected to the inner ring of the bearing by interference fit.

[0013] Preferably, sealing rings are embedded and fixed on the front and rear wall surfaces of the flange clamp, and the sealing rings are clamped between the flanges between the straight pipe and the U-shaped pipe constituting the inner circulation pipe to play a sealing role.

[0014] The advantages and positive effects of the utility model are: inside the high-heat pipeline, the water circulation scraper roller is driven by water flow to rotate, thereby driving the rubber scraper to continuously scrape the inner wall of the inner circulation pipe, which can effectively avoid the increase of the wall thickness of the inner circulation pipe and effectively avoid the reduction of the heat exchange efficiency of the inner circulation pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2 Is set in Figure 1 A schematic diagram of the structure of the water circulation scraper roller 25 in the inner circulation pipe 12;

[0018] Figure 3 yes Figure 2 A schematic diagram of the enlarged structure of the middle flange clip 19 in a side view. DETAILED DESCRIPTION

[0019] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0020] The following is a further description of the embodiments of the present invention in conjunction with the accompanying drawings:

[0021] like Figure 1-3 As shown, a heat exchanger with a self-cleaning structure described in the utility model comprises a tube mounting frame 10 and an inner circulation pipe 12 fixed on the tube mounting frame 10, wherein the inner circulation pipe 12 is connected by a plurality of straight pipes and U-shaped pipes to form a connected pipe, and an outer circulation pipe 11 is fixedly provided on the outer side of the straight pipes constituting the inner circulation pipe 12, and the adjacent outer circulation pipes 11 are connected in the middle through an outer circulation series pipe 13 to form a mutually connected pipe body;

[0022] A water circulation scraper roller 25 is also provided in the straight pipe of the inner circulation pipe 12, and its two ends are rotatably arranged between flanges and can rotate in the inner circulation pipe 12. The side of the water circulation scraper roller 25 is provided with a component that can scrape the inner wall of the inner circulation pipe 12 when rotating, thereby scraping off thermal scale during the heat exchange cycle, thereby avoiding the continuous increase in the wall thickness of the inner circulation pipe 12 and thus causing a decrease in its heat exchange efficiency.

[0023] Preferably, the water circulation scraping roller 25 includes a rotating shaft 17 whose outer wall surrounds a spiral blade 18. The spiral blade 18 will drive the rotating shaft 17 to rotate after being impacted by a unidirectional water flow, thereby causing the scraping component arranged on the rotating shaft 17 to rotate to clean the inner wall of the inner circulation pipe 12.

[0024] Preferably, a spring telescopic support rod 16 is welded and fixed on the outer wall of the rotating shaft 17, and a metal clamp plate 15 is fixed on the spring telescopic support rod 16, so that the metal clamp plate 15 can be pressed against the inner wall of the inner circulation pipe 12 for scraping due to the elastic expansion and contraction of the spring telescopic support rod 16, and the metal clamp plate 15 can be retracted due to the elasticity of the spring telescopic support rod 16 to avoid interference and jamming.

[0025] Preferably, a rubber scraper 14 is fixedly mounted on the outer wall of the metal clamping plate 51 and abuts against the inner wall of the inner circulation pipe 12. The material characteristics of the rubber scraper 14 can better protect the inner wall surface of the inner circulation pipe 12 while performing the sweeping operation. Moreover, the cost of replacing the rubber scraper 14 after wear is simpler and convenient to replace.

[0026] Preferably, flange clips 19 are provided at both ends of the rotating shaft 17, wherein screw holes 20 are provided at the outer annular intervals of the flange clips 19, and the flange clips 19 are arranged between the flange plates between the straight pipe and the U-shaped pipe constituting the inner circulation pipe 12 and fixed by bolts, a spoke plate 22 is welded and fixed in the flange clip 19, and a bearing seat 23 is fixed in the middle of the spoke plate 22, and a bearing 24 is embedded and fixed in the bearing seat 23, and the two ends of the rotating shaft 17 are connected to the inner ring of the bearing 24 by interference fit.

[0027] Preferably, a sealing ring 21 is embedded and fixed on the front and rear wall surfaces of the flange clamp 19, and the sealing ring 21 is clamped between the flange plates between the straight pipe and the U-shaped pipe constituting the inner circulation pipe 12 to play a sealing role.

[0028] It should be emphasized that the embodiments described in the present invention are illustrative rather than restrictive. Therefore, the present invention is not limited to the embodiments described in the specific implementation manner. Any other implementation manners derived by those skilled in the art based on the technical solution of the present invention also fall within the scope of protection of the present invention.

Claims

1. A heat exchanger with a self-cleaning structure, comprising a tube mounting frame (10) and an inner circulation pipe (12) fixed on the tube mounting frame (10), wherein the inner circulation pipe (12) is composed of a plurality of straight pipes and U-shaped pipes connected to form a connected pipe, and an outer circulation pipe (11) is fixedly arranged outside the straight pipes constituting the inner circulation pipe (12), and adjacent outer circulation pipes (11) are connected in the middle through an outer circulation series pipe (13) to form a mutually connected pipe body; Features: A water circulation scraper roller (25) is also provided in the straight pipe of the inner circulation pipe (12), the two ends of which are rotatably arranged between flanges and can rotate in the inner circulation pipe (12), and the side of the water circulation scraper roller (25) is provided with a component that can scrape the inner wall of the inner circulation pipe (12) when rotating.

2. A heat exchanger with a self-cleaning structure according to claim 1, characterized in that: The water circulation scraping roller (25) comprises a rotating shaft (17) whose outer wall surrounds a spiral blade (18); the spiral blade (18) drives the rotating shaft (17) to rotate after being impacted by a unidirectional water flow, thereby causing a scraping component arranged on the rotating shaft (17) to rotate to clean the inner wall of the inner circulation pipe (12).

3. A heat exchanger with a self-cleaning structure according to claim 2, characterized in that: A spring telescopic support rod (16) is welded and fixed on the outer wall of the rotating shaft (17), and a metal clamping plate (15) is fixed on the spring telescopic support rod (16). Under the elastic expansion and contraction of the spring telescopic support rod (16), the metal clamping plate (15) can be pressed against the inner wall of the inner circulation pipe (12) for scraping, and the metal clamping plate (15) can be retracted by the elasticity of the spring telescopic support rod (16) to avoid interference and jamming.

4. A heat exchanger with a self-cleaning structure according to claim 3, characterized in that: A rubber scraper (14) is fixedly mounted on the outer wall of the metal clamping plate (15) and abuts against the inner wall of the inner circulation pipe (12).

5. A heat exchanger with a self-cleaning structure according to claim 4, characterized in that: Flange clips (19) are provided at both ends of the rotating shaft (17), wherein screw holes (20) are provided at annular intervals outside the flange clips (19), and the flange clips (19) are arranged between flange plates between the straight pipe and the U-shaped pipe constituting the inner circulation pipe (12) and are fixed by bolts, a spoke plate (22) is welded and fixed in the flange clip (19), and a bearing seat (23) is fixed in the middle of the spoke plate (22), a bearing (24) is embedded and fixed in the bearing seat (23), and the two ends of the rotating shaft (17) are connected to the inner ring of the bearing (24) by interference fit.

6. A heat exchanger with a self-cleaning structure according to claim 5, characterized in that: A sealing ring (21) is embedded and fixed on the front and rear wall surfaces of the flange clamp (19), and the sealing ring (21) is clamped between the flange plates between the straight pipe and the U-shaped pipe constituting the internal circulation pipe (12).

Images