CN102128560B - Twisted ribbon pendant inside the heat exchange tube - Google Patents

Abstract

The invention discloses a twisted belt type inner insert in a heat exchange pipe. The twisted belt type inner insert mainly comprises a twisted belt and a matched sleeve, wherein the twisted belt consists of a twisted belt blade and a central shaft hole; and the matched sleeve consists of a long circular sleeve, a short circular sleeve and a groove. The external circle diameter at a certain position of the twisted belt is as same as the inside diameter of the heat exchange pipe, so that the twisted belt is automatically clamped in the heat exchange pipe; and when the twisted belt is subjected to the axial pull action in a directing pipe, the clamping force between the twisted belt and the wall of the heat exchange pipe is enhanced so as to prevent further motion of the twisted belt in the heat exchange pipe and realize self-tightening. During installation, the twisted belt is fixed in the heat exchange pipe, then the matched sleeve passes through the central shaft hole of the twisted belt, and the groove structure on the matched sleeve can be matched and clamped with the twisted belt blade, so that limit of a rotor rotating shaft is realized. The twisted belt type structure can disturb the fluid in the heat exchange pipe, so that the dirt carried by the fluid in the heat exchange pipe can flow out from the orifice of the heat exchange pipe, the possibility of blockage of the heat exchange pipe is reduced, the space in the heat exchange pipe is fully utilized, flowing of the fluid in the heat exchange pipe is convenient, the installation time is saved and the installation progress is accelerated.

Description

Twisted ribbon pendant inside the heat exchange tube

technical field

The invention relates to a supporting element used in heat exchange tubes for enhancing heat transfer and anti-fouling and descaling in equipment such as shell-and-tube heat exchangers, heat exchange reactors, and condensers.

Background technique

Since the outbreak of the oil crisis in the 1970s, energy-centered environmental, ecological, and socio-economic issues have intensified. Countries all over the world are fully aware of the importance of energy conservation. Rational use of energy has become an urgent problem to be solved in order to achieve sound industrial development. For this reason, various energy-saving technologies have sprung up like mushrooms after rain. In-tube insert technology is a relatively convenient heat transfer enhancement technology. Its biggest advantage is that it is suitable for the retrofit design of old heat exchangers, and it is easy to process and manufacture, which can avoid additional heat exchangers and greatly save investment. It helps to remove the dirt in the tube, which is unmatched by other enhanced heat transfer technologies.

There are many types of tube inserts. Common tube inserts include twisted ribbons, helical coils, coiled filaments, helical springs, and static mixers. In recent years, a new form of tube inserts has emerged. The Chinese patent number is ZL200520127121 .9, published a patent application titled "Rotor Type Self-cleaning Enhanced Heat Transfer Device". This device is composed of a fixed frame, a rotor, a flexible shaft and a support tube. The two fixed frames are respectively fixed at both ends of the heat exchange tube. The outer surface of the rotor has spiral ribs, and the rotor has a central hole; the supporting tube is arranged between the rotor and the fixed frame, and the flexible shaft passes through the central hole of the rotor and the supporting tube and is fixed on the two fixed frames. The device has the function of non-stop on-line automatic scale prevention and descaling and enhanced heat transfer. When the fluid flows in the heat transfer tube with or against flow, it has the functions of anti-scaling and descaling and enhanced heat transfer. In view of the further improvement of this patent, a Chinese patent application number 200620172805.5 appeared, and the patent application titled "low flow resistance rotor with self-cleaning and enhanced heat transfer in heat transfer tubes" appeared. The device is composed of a rotor, a pendant and a connecting axis. The pendant It is fixed at both ends of the heat transfer tube, and the two ends of the connection axis are respectively fixed on the pendant. Multiple rotors are mounted on the connection axis. The rotor is composed of a hollow shaft and blades, and each blade is in the same inclined shape as the hollow shaft. , the adjacent leaves meet end to end. The pendant installed at the end of the heat exchange tube will reduce the flow of fluid inflow, and because the heat exchange tube will be deformed during the installation and use of the heat exchanger, from round to oval or other shapes, resulting in the installation of the pendant It will consume a lot of energy and time.

The present invention designs the pendant structure of the tube insert in this new structure, and proposes a new combined pendant composed of a twisted belt structure and a matching sleeve. This new pendant reduces the impact on the fluid flow in the heat exchange tube. At the same time, it is easy to install, is conducive to the discharge of dirt in the fluid, and also has a certain turbulence effect on the fluid.

Contents of the invention

The purpose of the present invention is to design a new structure that can be used to fix the end of the rotating shaft of the heat exchange tube insertion element. The cross-sectional area is small, and the impact on fluid flow resistance and fluid flow is small. The twisted belt structure with a tapered structure has an automatic clamping function in the heat exchange tube.

The technical solution adopted by the present invention to achieve the above purpose is: the twisted band pendant in the heat exchange tube mainly includes two parts: the twisted band structure and the matching sleeve, wherein the twisted band structure is composed of the twisted band blade and the central shaft hole , The matching sleeve is composed of three parts: a long round sleeve, a short round sleeve and a groove. The twisted belt blades on the twisted belt structure are distributed symmetrically around the central shaft hole. The inner diameter of the central shaft hole is slightly larger than the outer diameter of the long circular sleeve on the matching sleeve, which is a large clearance fit, so that the long round sleeve can smoothly penetrate into the center. The shaft hole and the wall thickness formed by the outer diameter and inner diameter of the central shaft hole make the central shaft hole have sufficient strength and rigidity to meet the long-term use requirements. In the groove, the diameter of the outer circle of the twisted band structure changes from large to small along the axial direction of the twisted band, showing a conical shape, and the outer diameter of a certain place on the twisted band structure is exactly the same as the inner diameter of the heat exchange tube, which can make it clamped In the heat exchange tube, when the twisted band structure is subjected to an axial pulling force toward the inside of the tube, the clamping force between the twisted band and the inner wall of the heat exchange tube increases, preventing further movement of the twisted band in the heat exchange tube and realizing the self-tightening effect. During the installation process, the twisted band structure is first fixed in the heat exchange tube, and then the sleeve is penetrated through the central axis hole of the twisted band structure, and the groove structure on the sleeve can be clamped with the twisted band blade, and the two sides of the rotating shaft Use rivets to fix the matching sleeves at both ends, so as to realize the limit effect on the rotating shaft. At the same time, the twisted belt structure of the twisted belt blade can further turbulence the fluid in the heat exchange tube to achieve enhanced heat transfer and prevent dirt deposition. Because the cross-sectional area of the heat exchange tube occupied by it is small, the fluid in the heat exchange tube The entrained dirt can flow out from the outlet of the heat exchange tube without accumulating at the outlet of the heat exchange tube to block the nozzle. In the case of meeting the strength and rigidity requirements, the thickness of the twisted belt structure should be as small as possible, so as not to occupy a large fluid flow area, so as to facilitate the timely discharge of dirt.

In the present invention, the inner twisted ribbon pendant of the heat exchange tube, the outer diameter of the twisted belt structure is the same as the inner diameter of the heat exchange tube can be located in the middle of the twisted belt structure or close to both ends, so that the part stuck outside the heat exchange tube has a certain length, and the guide flow is significant.

In the twisted-band pendant in the heat exchange tube of the present invention, the number of twisted-band vanes can be two, three or more, and the twisted-band vanes are symmetrically distributed around the central axis hole.

The inner twisted ribbon pendant in the heat exchange tube of the present invention is made of plastic to cooperate with the casing to prevent it from wearing out on the rotating shaft, and the twisted belt structure is made of metal, plastic or composite material with certain strength and rigidity to ensure the service life of the twisted ribbon pendant .

In the present invention, the inner twisted belt pendant of the heat exchange tube has several semi-cylindrical structures with the central axis of the twisted belt structure, and there are openings between each semi-cylindrical structure, so that fluid can flow through the openings, further enhancing the disturbance of the fluid.

The inner twisted ribbon pendant of the heat exchange tube of the present invention, the thickness of the twisted ribbon blades of the twisted ribbon structure is non-uniformly distributed along the radial direction of the outer circle of the twisted belt, and the thickness changes from large to small along the radial direction of the outer circle, and the thickness is the closest to the central axis. Thick to increase the rigidity of the twisted strap structure and save material.

In the present invention, the inner twisted ribbon pendant of the heat exchange tube, the blade thickness of the twisted ribbon blade at the cone part changes along the axial direction, the blade is the thinnest at the part with the smallest diameter at the cone part, and the blade at the same part with the same diameter as the short circular casing at the leading cone is the thickest. The diversion slope formed on the surface of the cone of the structure can reduce the resistance of the twisted band structure installed at the outlet of the heat exchange tube to the fluid flowing out of the tube.

The beneficial effects of the twisted ribbon pendant in the heat exchange tube of the present invention are as follows: 1. The twisted ribbon pendant in the heat exchange tube can be installed on the heat exchange tube conveniently and quickly, saving installation time and speeding up the installation progress; Space, the cross-sectional area of the heat exchange tube occupied is small, which is convenient for the fluid flow in the heat exchange tube; 3. The twisted belt structure disturbs the fluid, which enhances the turbulence of the fluid in the heat exchange tube, thereby enhancing heat transfer; 4. Convenient The flow of dirt in the fluid avoids the accumulation of dirt at the inlet and outlet of the heat exchange tube, and reduces the possibility of the heat exchange tube being blocked; The clamping force with the inner wall of the heat exchange tube is enhanced to realize the self-tightening function.

The heat exchange tube inner twisted belt pendant of the present invention can determine the size of the twisted belt structure according to the inner diameter of the specific heat exchange tube, determine the size of the matching sleeve according to the outer diameter of the rotating shaft, and use rivets to axially fix the two ends of the rotating shaft. The rotating shaft connects several rotors in series and passes through the heat exchange tube. The twisted belt structure is clamped in the heat exchange tube, and the matching sleeve is clamped on the twisted belt structure. The rotating shaft passes through the matching sleeve and is fixed with rivets, so that the end of the rotating shaft is fixed, and the installation is convenient and quick. The twisted belt structure has the effect of turbulence on the fluid to achieve enhanced heat transfer. The cross-sectional area of the heat exchange tube occupied by this structure is small, which reduces the resistance encountered when the fluid flows through, and at the same time allows the dirt in the fluid to be removed in time. Discharge, to avoid the deposition of dirt, to prevent the nozzle blockage of heat exchange tubes.

Description of drawings

Fig. 1 is a three-dimensional schematic diagram of the twisted-band structure of the twisted-band-type pendant in the heat exchange tube of the present invention.

Fig. 2 is a schematic diagram of the two-dimensional structure of the twisted ribbon structure of the inner twisted ribbon pendant in the heat exchange tube of the present invention.

Fig. 3 is a left side view of Fig. 2 .

Fig. 4 is a three-dimensional structural schematic diagram of the matching sleeve of the inner twisted ribbon pendant of the heat exchange tube of the present invention.

Fig. 5 is a schematic diagram of the installation structure of the application of the inner twisted ribbon pendant in the heat exchange tube of the present invention.

In the figure, 1-twisted belt blade, 2-central shaft hole, 3-long circular sleeve, 4-groove, 5-short circular sleeve, 6-twisted belt structure, 7-heat exchange tube, 8-rotating shaft, 9 -rotor, 10-cooperating sleeve, 11-rivet, 12-opening.

Detailed ways

An example of the application of the inner twisted ribbon pendant of the heat exchange tube of the present invention is shown in Figure 5. In the figure, the inner twisted ribbon pendant of the heat exchange tube of the present invention is mainly composed of two parts: the twisted ribbon structure 6 and the matching sleeve 10, wherein the twisted ribbon structure 6 includes the twisted belt blade 1 and the central shaft hole 2, see Figure 1-Figure 3, the matching sleeve 10 includes a long round sleeve 3, a groove 4 and a short round sleeve 5, see Figure 4, the long round sleeve 3 and the short round sleeve The round sleeve 5 is concentric and fixedly connected, the long round sleeve 3 and the short round sleeve 5 have an axial inner hole, the outer diameter of the long round sleeve 3 is smaller than the outer diameter of the short round sleeve 5, and the groove 4 is located close to the long round sleeve 3 on the end face of the short circular sleeve 5. As shown in Figure 5, the right end is the fluid inlet end, and the left end is the outlet end. The length of the long circular sleeve is long enough to ensure that when the rotating shaft is elongated, there is always a section located in the central shaft hole, which reduces the torque of the twisted blades on the rotating shaft. Wear and ensure the centering effect of the twisted belt structure. The twisted belt blade 1 is fastened to the two ends of the heat exchange tube 7, the two ends of the rotating shaft 8 pass through the long circular sleeve 3 and the short circular sleeve 5 in turn, and are fixed with rivets 11, and the rotating shaft 8 is twisted from the matching sleeve 10 The central shaft hole 2 of the belt structure 6 passes through, and is clamped on the twisted belt structure 6 through the groove 4, so as to realize the fixing of both ends of the rotating shaft 8, and several rotors 9 are mounted on the rotating shaft 8 between the two pendants. This installation method is easy to operate, and the troublesome limit operation can be completed in advance.

The twisted belt structure 6 of the twisted belt type pendant in the heat exchange tube of the present invention can be made of metal, plastic or composite material with good rigidity and strength, and two or more twisted belt blades 1 that are symmetrical around the central axis hole 2 are arranged, so that The pendant has better centering. The thickness of the twisted belt structure 6 should be as small as possible, so as not to occupy much fluid circulation area, so as to facilitate the timely discharge of dirt and prevent the heat exchange tubes from being blocked by dirt. The twisted structure of the twisted blade 1 can further disturb the flow of the fluid in the heat exchange tube 7, so as to enhance heat transfer and prevent fouling deposition. The matching sleeve 10 of the inner twisted ribbon pendant in the heat exchange tube of the present invention can be made of plastic material, so as to reduce its wear on the rotating shaft 8 and prolong the service life of the rotating shaft 8 .

The central axis on the twisted belt structure 6 of the inner twisted belt pendant in the heat exchange tube of the present invention is a plurality of semi-cylindrical structures, and there are openings 12 between each semi-cylindrical structure, so that the fluid can flow through the openings 12, further enhancing the fluid absorption. disturbance to achieve enhanced heat transfer. At the same time, the conical surface of the twisted band structure 6 has a guide slope to reduce the resistance of the twisted band structure 6 installed at the outlet of the heat exchange tube to the fluid flowing out of the tube.

Claims (6)

1. twisted strip type suspension member in the heat exchanger tube, it is characterized in that: mainly comprise the twisted strip structure and cooperate sleeve pipe, the twisted strip structure is made up of twisted strip blade and central shaft hole; Cooperate sleeve pipe to be made up of oval sleeve, short round buss and groove, oval sleeve also is fixedly connected with short round buss is concentric, and oval sleeve has axial bore with short round buss; The external diameter of oval sleeve is less than the external diameter of short round buss; Groove is positioned on the end face near the short round buss of oval sleeve, and the structural twisted strip blade of twisted strip is symmetrically distributed around central shaft hole, and the diameter of bore of central shaft hole is slightly larger than the overall diameter that cooperates oval sleeve on the sleeve pipe; The groove width of groove is greater than the thickness of twisted strip blade; The outside diameter of twisted strip structure is conical along the axial descending variation of twisted strip, and the outside diameter in somewhere is identical with the heat exchanger tube internal diameter just on the twisted strip structure.

2. twisted strip type suspension member in the heat exchanger tube according to claim 1 is characterized in that: twisted strip structure outside diameter exists together with the heat exchanger tube internal diameter mutually can be positioned at twisted strip structure middle part.

3. twisted strip type suspension member in the heat exchanger tube according to claim 1, it is characterized in that: the twisted strip blade quantity can be for a plurality of, and the twisted strip blade is symmetrically distributed around central shaft hole.

4. twisted strip type suspension member in the heat exchanger tube according to claim 1 is characterized in that: cooperate sleeve pipe to adopt plastic production, the twisted strip structure adopts metal, plastics or composite to make.

5. twisted strip type suspension member in the heat exchanger tube according to claim 1 is characterized in that: twisted strip structure centre axle has perforate for several semicircular cylinder structures between each semicircular cylinder structure.

6. twisted strip type suspension member in the heat exchanger tube according to claim 1 is characterized in that: the twisted strip vane thickness of twisted strip structure along the twisted strip outer circle diameter to non-uniform Distribution, along the cylindrical descending variation of its thickness in the radial direction, the thickest near central axis.

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