Energy-saving heat exchanger for asphalt heating tank

Abstract

The invention belongs to the technical field of heat exchange equipment, and particularly relates to an energy-saving heat exchanger for an asphalt heating tank, which comprises a heat exchanger body, a heating cavity is formed in the heat exchanger body, and a spiral heat exchange pipe communicated with the interior of the heating cavity is arranged above the heat exchanger body. The spiral heat exchange pipe is used for heating asphalt through hot oil; and the heating mechanism is used for conducting heating treatment on asphalt through hot oil in the spiral heat exchange pipes, and the heating mechanism comprises an annular plate rotationally connected to the upper end of the heat exchanger body. According to the asphalt heating device, by arranging the heating mechanism and the stirring mechanism, when asphalt is heated, the asphalt can be heated through hot oil which is circularly heated, and meanwhile, the asphalt is stirred, so that the heating effect of the asphalt is more uniform, and the situation that the local temperature is too high or too low is avoided; it is guaranteed that the asphalt is at the proper temperature in the subsequent mixing and laying process, and the machining quality and the construction quality are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of heat exchange equipment, and in particular relates to an energy-saving heat exchanger for an asphalt heating tank. Background Art

[0002] Asphalt is a complex natural or artificial petroleum derivative. It is usually a viscous semi-solid at room temperature with high viscosity and poor fluidity. During the production and processing of asphalt, it needs to be heated to a certain temperature through heat exchange equipment to make it a more fluid liquid, easier to mix with other materials, and ensure the quality and consistency of construction materials. For example, when producing asphalt concrete, the asphalt needs to be heated to ensure that the aggregate and asphalt are fully mixed and fused. In addition, after the asphalt production and processing is completed, it also needs to be heated to ensure that the asphalt can be more conveniently transported through pipelines, tank trucks, etc. during transportation and storage without clogging or sticking.

[0003] However, the waste heat recovery device for an asphalt heating tank disclosed in the existing Chinese Publication No. CN218583824U still has the following technical problems when heating asphalt: Traditional heating methods such as steam heating or electric heating usually require high energy input to reach the required asphalt heating temperature, which not only causes a huge waste of energy, but also the heating effect on the asphalt is not uniform, causing the asphalt to easily have local temperatures that are too high or too low, which in turn causes the asphalt to be unable to be evenly mixed or laid at the appropriate temperature, affecting the processing quality and construction quality of the asphalt. Summary of the invention

[0004] The purpose of the present invention is to address the problems raised in the above background technology and to provide an energy-saving heat exchanger for an asphalt heating tank that can heat asphalt through circulating heated hot oil and at the same time stir the asphalt to make the asphalt heating effect more uniform.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: An energy-saving heat exchanger for an asphalt heating tank, comprising: A heat exchanger body, wherein a heating chamber is provided in the heat exchanger body, and a spiral heat exchange tube communicating with the interior of the heating chamber is provided above the heat exchanger body, and the spiral heat exchange tube heats the asphalt through hot oil; A heating mechanism is used to heat the asphalt through the hot oil in the spiral heat exchange tube, the heating mechanism includes an annular plate rotatably connected to the upper end of the heat exchanger body, a turntable is fixedly connected to the upper end of the annular plate, a guide cylinder is fixedly connected to the turntable, the guide cylinder communicates the heating chamber and the spiral heat exchange tube, an electric heating wire for heating the hot oil is arranged inside the heat exchanger body, and a circulation component is also arranged between the spiral heat exchange tube and the heating chamber; The stirring mechanism is used to stir the asphalt during the heat exchange process, and the stirring mechanism includes a magnetic coupling transmission component for driving the turntable to rotate.

[0006] Preferably, the circulation component includes a first annular guide frame fixedly connected to the bottom end of the guide cylinder, the first annular guide frame is air-tightly rotatably connected to the upper end of the heat exchanger body and connected to the inside of the heating chamber, the guide cylinder extends to a position above the turntable and is fixedly connected to a guide block through a first support rod, the two ends of the spiral heat exchange tube are respectively connected to the inside of the guide cylinder and the guide block, the upper end of the guide block is fixedly connected to a first return pipe, the end of the first return pipe away from the guide block is indirectly connected to a second return pipe, the bottom end of the second return pipe is fixedly connected to a second annular guide frame, the second annular guide frame is air-tightly rotatably connected to the peripheral side wall of the heat exchanger body and connected to the inside of the heating chamber, and a pump body for driving the circulation of hot oil is provided inside the heat exchanger body.

[0007] Preferably, the stirring mechanism further comprises a first gear ring fixedly connected to the upper end of the heat exchanger body via a second support rod, and a second gear ring meshing with the first gear ring is fixedly connected to the peripheral side wall of the guide tube below the turntable.

[0008] Preferably, the heat exchanger body also includes a friction preheating mechanism, which includes an annular preheating box fixedly connected between the first return pipe and the second return pipe, the first return pipe and the second return pipe are both connected to the inside of the annular preheating box, a fixing ring is rotatably connected to the outer peripheral wall of the annular preheating box, the fixing ring is fixedly installed above the heat exchanger body, a friction ring is fixedly connected to the inner wall of the fixing ring, and a heat conductive ring in contact with the friction ring is fixedly connected to the peripheral side wall of the annular preheating box.

[0009] Preferably, the friction ring is made of carbon fiber material, the heat conductive ring is made of steel material, and the fixed ring and the annular preheating box except the friction ring and the heat conductive ring are made of polyurethane material.

[0010] Preferably, the magnetic coupling transmission assembly includes a driving motor fixedly connected to the top of the heat exchanger body, a driving magnetic block is fixedly connected to the output end of the driving motor, a driven magnetic ring is fixedly connected to the inner wall of the annular plate, and the driving magnetic block and the driven magnetic ring are attracted to each other with opposite poles.

[0011] Preferably, the heat exchanger body also includes a regulating mechanism, which includes a regulating box fixedly connected to the inner wall of the annular preheating box, a limiting groove is provided on the inner wall of the regulating box, a liquid storage chamber is provided inside the regulating box, a piston block is air-tightly and slidably connected to the liquid storage chamber, a return spring is provided between the piston block and the inner wall of the liquid storage chamber, an L-shaped push block fixedly connected to the piston block is slidably connected in the limiting groove, and a sliding piece is fixedly connected to the part of the L-shaped push block extending outside the limiting groove, an regulating cylinder is fixedly connected to the output end of the drive motor, a liquid infusion tube is air-tightly and rotatably connected to the bottom end of the regulating cylinder, the other end of the liquid infusion tube is connected to the inside of the liquid storage chamber, an extension channel is fixedly connected to the side wall of the regulating cylinder, a push rod is air-tightly and slidably connected in the extension channel, and the part of the push rod extending outside the extension channel is fixedly connected to the driving magnetic block, a liquid storage space is formed between the regulating box, the liquid infusion tube, the regulating cylinder and the inside of the extension channel, and the liquid storage space is filled with hydraulic oil.

[0012] Preferably, during the sliding process of the sliding plate relative to the regulating box, the sliding plate always hermetically seals the limiting groove.

[0013] Compared with the existing technology, the advantages of this energy-saving heat exchanger for asphalt heating tank are: The present invention provides a heating mechanism and a stirring mechanism. When heating the asphalt, the asphalt can be heated by circulating heated hot oil. At the same time, during the heating process, the annular plate can drive the guide tube to perform circular motion, and drive the spiral heating tube to rotate during the circular motion, thereby stirring the asphalt, making the heating effect of the asphalt more uniform, avoiding the situation where the local temperature is too high or too low, and saving the energy consumption required to evenly heat the hot oil to a suitable temperature.

[0014] The present invention provides a friction preheating mechanism, which can drive the annular preheating box to rotate relative to the fixed ring during the rotation of the spiral heating tube, thereby causing the heat conductive ring to rotate relative to the friction ring. The hot oil flowing through the annular preheating box is preheated by generating heat through friction, thereby improving the heating effect of the hot oil and ensuring the subsequent heating effect of the hot oil on the asphalt.

[0015] The present invention provides an adjustment mechanism. Since the spiral heating tube will drive the annular preheating box to rotate during the rotation process, it will also drive the adjustment box on its inner wall to rotate, and further adjust the stirring rate of the asphalt by the spiral heating tube of the asphalt according to the viscosity of the asphalt. When the viscosity of the asphalt is high, the sliding vane on the inner wall of the adjustment box will be subjected to greater shear stress during the rotation of the adjustment box, thereby making the distance between the driving magnetic block and the driven magnetic ring closer, and making the magnetic field coupling between the driving magnetic block and the driven magnetic ring relatively strong, so that when the driving motor drives the driving magnetic block to rotate, the rotation speed of the turntable increases, so that when the viscosity of the asphalt is high, the stirring effect of the spiral heating tube on the asphalt is relatively stronger, thereby ensuring the uniformity of heating. When the viscosity of the asphalt is low, the sliding vane on the inner wall of the adjustment box is subjected to less shear stress, so that the magnetic field coupling between the driving magnetic block and the driven magnetic ring is relatively weak, driving the rotation speed of the turntable to decrease, thereby avoiding excessive dispersion of the asphalt or generation of bubbles due to excessive stirring, thereby affecting the fluidity and adhesion of the asphalt. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the present invention; Figure 2 It is a cross-sectional structural schematic diagram of the present invention; Figure 3 yes Figure 2 The enlarged view of point A in the middle; Figure 4 is a partial cross-sectional view of a circulation component in the present invention; Figure 5 It is a partial cross-sectional view of the adjustment mechanism in the present invention.

[0017] In the figure: 1, heat exchanger body; 11, heating chamber; 12, spiral heat exchange tube; 2, heating mechanism; 21, annular plate; 22, turntable; 23, guide tube; 24, circulation assembly; 241, first annular guide frame; 242, guide block; 243, first return pipe; 244, second return pipe; 245, second annular guide frame; 3, stirring mechanism; 31, magnetic coupling transmission assembly; 311, drive motor; 312, drive Moving magnetic block; 313, driven magnetic ring; 32, first gear ring; 33, second gear ring; 4, friction preheating mechanism; 41, annular preheating box; 42, fixed ring; 43, friction ring; 44, heat-conducting ring; 5, adjusting mechanism; 51, adjusting box; 52, limiting groove; 53, liquid storage chamber; 54, piston block; 55, L-shaped push block; 56, slide; 57, adjusting cylinder; 58, infusion tube; 59, extension channel; 510, push rod. DETAILED DESCRIPTION

[0018] The following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0019] Example: Refer to Figures 1 to 5, an energy-saving heat exchanger for an asphalt heating tank, comprising: A heat exchanger body 1, in which a heating chamber 11 is provided, and a spiral heat exchange tube 12 communicating with the interior of the heating chamber 11 is provided above the heat exchanger body 1. The spiral heat exchange tube 12 is made of a material with a high thermal conductivity, such as copper, and the spiral heat exchange tube 12 heats the asphalt through hot oil; The heating mechanism 2 is used to heat the asphalt through the hot oil in the spiral heat exchange tube 12. The heating mechanism 2 includes an annular plate 21 rotatably connected to the upper end of the heat exchanger body 1. A turntable 22 is fixedly connected to the upper end of the annular plate 21. A guide tube 23 is fixedly connected to the turntable 22. The guide tube 23 connects the heating chamber 11 and the spiral heat exchange tube 12. An electric heating wire for heating the hot oil is provided inside the heat exchanger body 1. A circulation component 24 is also provided between the spiral heat exchange tube 12 and the heating chamber 11, which is used to circulate the hot oil to improve the heat exchange effect between the hot oil and the asphalt. The circulation component 24 includes a first annular guide frame 241 fixedly connected to the bottom end of the guide cylinder 23, the first annular guide frame 241 is air-tightly rotatably connected to the upper end of the heat exchanger body 1 and is connected to the interior of the heating chamber 11, the guide cylinder 23 extends to a position above the turntable 22 and is fixedly connected to a guide block 242 through a first support rod, the two ends of the spiral heat exchange tube 12 are respectively connected to the interior of the guide cylinder 23 and the guide block 242, the upper end of the guide block 242 is fixedly connected to a first return pipe 243, the end of the first return pipe 243 away from the guide block 242 is indirectly connected to a second return pipe 244, the bottom end of the second return pipe 244 is fixedly connected to a second annular guide frame 245, the second annular guide frame 245 is air-tightly rotatably connected to the side wall of the heat exchanger body 1 and is connected to the interior of the heating chamber 11, and a pump body for driving the circulation of hot oil is provided inside the heat exchanger body 1.

[0020] Specifically, the pump body adopts a common centrifugal pump, which has good high temperature resistance and is suitable for driving the flow of hot oil at high temperatures. This is an existing mature technology, so it will not be described in detail.

[0021] A stirring mechanism 3 is used to stir the asphalt during the heat exchange process. The stirring mechanism 3 includes a magnetic coupling transmission component 31 for driving the rotating disk 22 to rotate; The stirring mechanism 3 also includes a first toothed ring 32 fixedly connected to the upper end of the heat exchanger body 1 through a second support rod, and a second toothed ring 33 meshing with the first toothed ring 32 is fixedly connected to the peripheral side wall of the guide cylinder 23 located below the rotating disk 22; Specifically, a protective cover can be fixedly connected to the upper end of the heat exchanger body 1 , and the protective cover is airtightly connected to the turntable 22 to prevent asphalt from penetrating and affecting the meshing of the first gear ring 32 and the second gear ring 33 .

[0022] Specifically, as the annular plate 21 drives the turntable 22 to rotate, it will drive the guide tube 23 thereon to rotate in a circle, and the circumferential rotation of the guide tube 23 will cause the first annular guide frame 241 to seal and rotate at the upper end of the heat exchanger body 1. At the same time, the first return pipe 243 and the second return pipe 244 are made of a relatively hard material, so that the first return pipe 243 and the second return pipe 244 can drive the second annular guide frame 245 to seal and rotate at the side wall of the heat exchanger body 1, ensuring that the circulation heating of the hot oil will not be affected during the stirring process, avoiding motion interference.

[0023] In view of the problem that the heating process of asphalt in the prior art easily causes great waste of energy and uneven heating effect, the present invention sets a heating mechanism 2 and a stirring mechanism 3. When heating the asphalt, the hot oil in the heating chamber 11 can be continuously transported to the spiral heat exchange tube 12 through the first annular guide frame 241 and the guide tube 23 by the pump body, so that heat exchange is carried out between the hot oil and the asphalt through the tube wall of the spiral heat exchange tube 12. At the same time, the hot oil heated in the spiral heat exchange tube 12 can be refluxed to the heating chamber 11 of the heat exchanger body 1 through the guide block 242, the first return pipe 243, the second return pipe 244 and the second annular guide frame 245 for heating. At the same time, during the heating process, the guide tube 23 is driven by the annular plate 21 to perform a circular motion, thereby In a step, the guide tube 23 is caused to rotate under the action of the first gear ring 32 and the second gear ring 33, thereby driving the spiral heat exchange tube 12 to rotate in the process of circular motion through the guide tube 23 and the guide block 242. The spiral heat exchange tube 12 simultaneously stirs the asphalt during the asphalt heating process. Since the hot oil has a higher specific heat capacity, compared with steam heating which requires heat exchange between steam and asphalt through contact, and electric heating which directly heats the asphalt through resistance heating, the asphalt is heated by circulating hot oil, which improves the heating effect of the asphalt. In the process, stirring action can be introduced to make the heating effect of the asphalt more uniform, avoid local over-high or over-low temperature, and save the energy consumption required to evenly heat the hot oil to a suitable temperature.

[0024] The friction preheating mechanism 4 is used to preheat the hot oil during the operation of the circulation component 24, to ensure the heating effect of the hot oil after the hot oil circulates back into the heating chamber 11, and further to ensure the heating effect of the hot oil on the asphalt; The friction preheating mechanism 4 includes an annular preheating box 41 fixedly connected between the first return pipe 243 and the second return pipe 244. The first return pipe 243 and the second return pipe 244 are both connected to the inside of the annular preheating box 41. A fixing ring 42 is rotatably connected to the outer peripheral wall of the annular preheating box 41. The fixing ring 42 is fixedly installed above the heat exchanger body 1. A friction ring 43 is fixedly connected to the inner wall of the fixing ring 42. A heat conductive ring 44 in contact with the friction ring 43 is fixedly connected to the peripheral side wall of the annular preheating box 41.

[0025] Specifically, the fixing ring 42 can be fixedly installed on the inner wall of the heating tank during actual use to ensure that the annular preheating box 41 will not drive the fixing ring 42 to rotate during rotation, to ensure that the heat conductive ring 44 and the friction ring 43 can rotate relative to each other, and to preheat the hot oil by generating heat through friction.

[0026] Specifically, the friction ring 43 is made of carbon fiber material, and the heat-conducting ring 44 is made of steel material. The friction ring 43 made of carbon fiber material and the heat-conducting ring 44 made of steel material can generate large friction heat when they rotate relative to each other. The driving motor 311 here can adopt a high-power motor, such as a permanent magnet synchronous motor. Since there is no excitation loss, the driving heat-conducting ring 44 can be driven to rotate relative to the friction ring 43. The fixed ring 42 and the annular preheating box 41 except the friction ring 43 and the heat-conducting ring 44 are made of polyurethane material with good thermal insulation performance, so as to improve the preheating effect of friction heat on the hot oil, thereby improving the heating effect during the hot oil circulation process.

[0027] It is worth mentioning that the present invention, by setting a friction preheating mechanism 4, can drive the annular preheating box 41 to rotate through the first return pipe 243 during the rotation of the spiral heat exchange tube 12, and further drive the second annular guide frame 245 to rotate through the second return pipe 244. During this process, the annular preheating box 41 can rotate relative to the fixed ring 42, so that the heat conductive ring 44 rotates relative to the friction ring 43, and the generated heat is transferred to the hot oil in the annular preheating box 41. The hot oil flowing through the annular preheating box 41 is preheated by frictional heat generation, thereby improving the heating effect on the hot oil and ensuring the subsequent heating effect of the hot oil on the asphalt through the wall of the spiral heat exchange tube 12.

[0028] The magnetic coupling transmission assembly 31 includes a driving motor 311 fixedly connected to the top of the heat exchanger body 1, a driving magnetic block 312 is fixedly connected to the output end of the driving motor 311, and a driven magnetic ring 313 is fixedly connected to the inner wall of the annular plate 21, and the driving magnetic block 312 and the driven magnetic ring 313 have opposite poles that attract each other.

[0029] Specifically, the driving magnetic block 312 and the driven magnetic ring 313 can be made of electromagnets or permanent magnets to ensure the service life of the heat exchanger.

[0030] Specifically, the degree of magnetic field coupling between the driving magnetic block and the driven magnetic ring is relatively large, and when the degree of magnetic field coupling between the driving magnetic block 312 and the driven magnetic ring 313 fluctuates up and down, the transmission efficiency between the driving magnetic block 312 and the driven magnetic ring 313 can change, but it can always drive the annular plate 21 and the turntable 22 to rotate.

[0031] The heat exchanger body 1 also includes an adjustment mechanism 5, which is used in conjunction with the magnetic coupling transmission assembly 31 to adjust the stirring rate of the asphalt according to the viscosity of the asphalt to avoid excessive stirring and insufficient stirring effect of the asphalt during the heating process. The adjustment mechanism 5 includes an adjustment box 51 fixedly connected to the inner wall of the annular preheating box 41, and a limit groove 52 is provided on the inner wall of the adjustment box 51. A liquid storage chamber 53 is provided inside the adjustment box 51, and a piston block 54 is airtightly slidably connected to the liquid storage chamber 53. A return spring is provided between the piston block 54 and the inner wall of the liquid storage chamber 53. An L-shaped push block 55 fixedly connected to the piston block 54 is slidably connected to the limit groove 52, and a sliding piece 56 is fixedly connected to the portion of the L-shaped push block 55 extending outside the limit groove 52. The output end of the drive motor 311 is provided with a piston block 54. An adjusting cylinder 57 is fixedly connected, and an infusion tube 58 is air-tightly rotatably connected to the bottom end of the adjusting cylinder 57, and the other end of the infusion tube 58 is connected to the interior of the liquid storage chamber 53. An extension channel 59 is fixedly connected on the side wall of the adjusting cylinder 57, and a push rod 510 is air-tightly slidably connected in the extension channel 59. The part of the push rod 510 extending outside the extension channel 59 is fixedly connected to the driving magnet 312, and a liquid storage space is formed among the adjusting box 51, the infusion tube 58, the adjusting cylinder 57 and the interior of the extension channel 59, and the liquid storage space is filled with hydraulic oil.

[0032] Specifically, through the return spring, when the shear stress generated by the asphalt is small, the elastic force of the return spring can be used to make the sliding piece 56 move in a relatively small range.

[0033] Specifically, during the sliding of the sliding piece 56 relative to the adjusting box 51, the sliding piece 56 always hermetically seals the limiting groove 52. Here, the length of the sliding piece 56 on both sides of the L-shaped push block 55 is greater than the length of the limiting groove 52, ensuring that the sliding piece 56 can always seal the limiting groove 52 and prevent asphalt from entering the limiting groove 52 and affecting the normal operation of the adjusting mechanism 5.

[0034] In addition, the present invention provides an adjustment mechanism 5. Since the spiral heat exchange tube 12 drives the annular preheating box 41 to rotate during the rotation process, the adjustment box 51 on the inner wall thereof will be driven to rotate, and the stirring rate of the asphalt by the spiral heat exchange tube 12 is further adjusted according to the viscosity of the asphalt. The specific adjustment process is as follows: When the viscosity of the asphalt is high, the sliding piece 56 on the inner wall of the regulating box 51 will be subjected to a large shear stress during its rotation, so that the sliding piece 56 is displaced to one side by a relatively large distance relative to the regulating box 51, and further the piston block 54 is driven by the L-shaped push block 55 to slide a relatively large distance in the liquid storage chamber 53, so that a large volume of hydraulic oil in the liquid storage chamber 53 enters the regulating cylinder 57 through the liquid infusion pipe 58, so that the push rod 510 moves a large distance outward in the extension channel 59, so that the distance between the driving magnetic block 312 and the driven magnetic ring 313 is closer, so that the driving magnetic block 312 and the driven magnetic ring 313 are closer. The magnetic field coupling between the moving magnetic rings 313 is relatively strong, and the magnetic field generated by the driving magnetic block 312 can more strongly affect the driven magnetic ring 313, so that the driving magnetic block 312 pulls the driven magnetic ring 313 to rotate more strongly during the rotation process, generating a greater driving force, so that when the driving motor 311 drives the driving magnetic block 312 to rotate, the driving magnetic block 312 drives the driven magnetic ring 313 to rotate at a relatively fast speed, further driving the speed of the turntable 22 to increase, so that when the viscosity of the asphalt is relatively large, the stirring effect of the spiral heat exchange tube 12 on the asphalt is relatively stronger, ensuring the stirring effect on the asphalt, and then ensuring the uniformity of heating; When the viscosity of the asphalt is low, the sliding piece 56 on the inner wall of the regulating box 51 will be subjected to a smaller shear stress during its rotation, so that the sliding piece 56 is displaced to one side relative to the regulating box 51 by a smaller distance, the piston block 54 slides a smaller distance in the liquid storage chamber 53, and the volume of the hydraulic oil in the liquid storage chamber 53 entering the regulating cylinder 57 through the liquid infusion tube 58 is smaller, so that the push rod 510 moves a smaller distance to the outside in the extension channel 59, the distance between the driving magnetic block 312 and the driven magnetic ring 313 is farther, and the magnetic field coupling between the driving magnetic block 312 and the driven magnetic ring 313 is relatively weak, so that when the driving motor 311 drives the driving magnetic block 312 to rotate, the speed of the driven magnetic ring 313 driven by the driving magnetic block 312 is relatively slow, and the speed of the turntable 22 is further reduced, so that when the viscosity of the asphalt is relatively high, the stirring effect of the spiral heat exchange tube 12 on the asphalt is relatively weak, so as to avoid excessive dispersion of the asphalt or generation of bubbles due to excessive stirring, which affects the fluidity and adhesion of the asphalt; In summary, when heating asphalt, the heating effect of asphalt can be more carefully controlled to ensure the quality of asphalt, thereby improving the subsequent processing and construction effects of asphalt.

[0035] The present invention can be explained by the following operation mode: When in use, the heat exchanger body 1 is installed inside the heating tank, and then the hot oil is circulated through the heating chamber 11, the first annular guide frame 241, the guide tube 23, the spiral heat exchange tube 12, the guide block 242, the first return pipe 243, the second return pipe 244 and the second annular guide frame 245 through the pump body, and the hot oil is heated by the electric heating wire when it flows through the heating chamber 11. At the same time, the guide tube 23 is driven to perform circular motion through the annular plate 21, and further the guide tube 23 is rotated under the action of the first gear ring 32 and the second gear ring 33, and the spiral heat exchange tube 12 simultaneously stirs the asphalt during the asphalt heating process, saving the energy consumption required to evenly heat the hot oil to a suitable temperature; During the rotation of the spiral heat exchange tube 12, the annular preheating box 41 is driven to rotate, and the second annular guide frame 245 is further driven to rotate through the second return pipe 244. During this process, the annular preheating box 41 can rotate relative to the fixed ring 42, so that the heat conducting ring 44 rotates relative to the friction ring 43, and the generated heat is transferred to the hot oil in the annular preheating box 41. The hot oil flowing through the annular preheating box 41 is preheated by friction heat generation. The spiral heat exchange tube 12 will drive the annular preheating box 41 to rotate during the rotation process, and thus will drive the regulating box 51 on its inner wall to rotate. According to the influence of the asphalt viscosity on the sliding vane 56, the distance between the driving magnetic block 312 and the driven magnetic ring 313 is adjusted, thereby adjusting the stirring rate of the asphalt by the spiral heat exchange tube 12. When the viscosity of the asphalt is high, the stirring rate is appropriately increased to ensure the uniformity of heating. When the viscosity of the asphalt is low, the stirring rate is appropriately reduced to avoid excessive dispersion of the asphalt or the generation of bubbles due to excessive stirring.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An energy-saving heat exchanger for an asphalt heating tank, characterized in that: include: A heat exchanger body (1), wherein a heating chamber (11) is provided in the heat exchanger body (1), and a spiral heat exchange tube (12) is provided above the heat exchanger body (1), and the spiral heat exchange tube (12) heats the asphalt using hot oil; A heating mechanism (2) for heating asphalt with hot oil in the spiral heat exchange tube (12), the heating mechanism (2) comprising an annular plate (21) rotatably connected to the upper end of the heat exchanger body (1), a rotating disk (22) being fixedly connected to the upper end of the annular plate (21), a guide tube (23) being fixedly connected through the rotating disk (22), the guide tube (23) being connected to the heating chamber (11) and the spiral heat exchange tube (12), an electric heating wire for heating the hot oil being provided inside the heat exchanger body (1), and a circulation component (24) being provided between the spiral heat exchange tube (12) and the heating chamber (11); The stirring mechanism (3) is used to stir the asphalt during the heat exchange process, and the stirring mechanism (3) comprises a magnetic coupling transmission component (31) used to drive the rotating disk (22) to rotate.

2. The energy-saving heat exchanger for asphalt heating tank according to claim 1 is characterized in that: The circulation assembly (24) comprises a first annular flow guide frame (241) fixedly connected to the bottom end of the flow guide tube (23); the first annular flow guide frame (241) is airtightly rotatably connected to the upper end of the heat exchanger body (1) and is connected to the interior of the heating chamber (11); the flow guide tube (23) extends to a position above the rotating disk (22) and is fixedly connected to a flow guide block (242) via a first support rod; the two ends of the spiral heat exchange tube (12) are respectively connected to the interior of the flow guide tube (23) and the flow guide block (242); The upper end of the guide block (242) is fixedly connected to a first return pipe (243); an end of the first return pipe (243) away from the guide block (242) is indirectly connected to a second return pipe (244); the bottom end of the second return pipe (244) is fixedly connected to a second annular guide frame (245); the second annular guide frame (245) is airtightly rotatably connected to the peripheral wall of the heat exchanger body (1) and is connected to the interior of the heating chamber (11); a pump body for driving the circulation of hot oil is provided inside the heat exchanger body (1).

3. The energy-saving heat exchanger for asphalt heating tank according to claim 2 is characterized in that: The stirring mechanism (3) further comprises a first toothed ring (32) fixedly connected to the upper end of the heat exchanger body (1) via a second support rod, and a second toothed ring (33) meshing with the first toothed ring (32) is fixedly connected to the peripheral side wall of the guide tube (23) located below the rotating disk (22).

4. The energy-saving heat exchanger for asphalt heating tank according to claim 2 is characterized in that: The heat exchanger body (1) further comprises a friction preheating mechanism (4), the friction preheating mechanism (4) comprising an annular preheating box (41) fixedly connected between the first return pipe (243) and the second return pipe (244), a fixing ring (42) rotatably connected to the outer peripheral wall of the annular preheating box (41), the fixing ring (42) being fixedly mounted above the heat exchanger body (1), a friction ring (43) being fixedly connected to the inner wall of the fixing ring (42), and a heat conducting ring (44) in contact with the friction ring (43) being fixedly connected to the peripheral side wall of the annular preheating box (41).

5. The energy-saving heat exchanger for asphalt heating tank according to claim 4 is characterized in that: The friction ring (43) is made of carbon fiber material, and the heat conducting ring (44) is made of steel material.

6. The energy-saving heat exchanger for asphalt heating tank according to claim 4, characterized in that: The magnetic coupling transmission assembly (31) comprises a driving motor (311) fixedly connected to the top of the heat exchanger body (1); a driving magnetic block (312) is fixedly connected to the output end of the driving motor (311); a driven magnetic ring (313) is fixedly connected to the inner wall of the annular plate (21); and the driving magnetic block (312) and the driven magnetic ring (313) attract each other with opposite poles.

7. The energy-saving heat exchanger for asphalt heating tank according to claim 6 is characterized in that: The heat exchanger body (1) further comprises an adjusting mechanism (5), the adjusting mechanism (5) comprising an adjusting box (51) fixedly connected to the inner wall of the annular preheating box (41), a limiting groove (52) being provided on the inner wall of the adjusting box (51), a liquid storage chamber (53) being provided inside the adjusting box (51), a piston block (54) being airtightly slidably connected inside the liquid storage chamber (53), a return spring being provided between the piston block (54) and the inner wall of the liquid storage chamber (53), an L-shaped push block (55) fixedly connected to the piston block (54) being slidably connected inside the limiting groove (52), a sliding plate (56) being fixedly connected to the portion of the L-shaped push block (55) extending outside the limiting groove (52), the An adjusting cylinder (57) is fixedly connected to the output end of the driving motor (311); a liquid infusion tube (58) is airtightly rotatably connected to the bottom end of the adjusting cylinder (57); the other end of the liquid infusion tube (58) is in communication with the interior of the liquid storage chamber (53); an extension channel (59) is fixedly connected to the side wall of the adjusting cylinder (57); a push rod (510) is airtightly slidably connected to the interior of the extension channel (59); a portion of the push rod (510) extending outside the extension channel (59) is fixedly connected to the driving magnet (312); a liquid storage space is formed between the adjusting box (51), the liquid infusion tube (58), the adjusting cylinder (57) and the interior of the extension channel (59); and the liquid storage space is filled with hydraulic oil.

8. The energy-saving heat exchanger for asphalt heating tank according to claim 7, characterized in that: During the sliding process of the sliding plate (56) relative to the regulating box (51), the sliding plate (56) always hermetically seals the limiting groove (52).

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