Dynamic Convective Heat Transfer Enhancement Device with Adjustable Function

Abstract

The present invention provides a device for dynamically adjusting convective enhanced heat transfer, comprising: a geothermal well, a variable-diameter speed-increasing pipe disposed in the geothermal well, and a U-shaped heat exchanger disposed in the variable-diameter speed-increasing pipe; wherein, evenly spaced support ring sleeves are disposed along the outer side of the U-shaped heat exchanger, and an inflatable expansion ring is disposed on the outer side of the support ring sleeve, and the inflatable expansion ring is located between the support ring sleeve and the variable-diameter speed-increasing pipe; an electronic inflation valve and an electronic deflation valve are disposed on the inflatable expansion ring, wherein the electronic inflation valve is connected to an inflation tank through an inflation pipe, a switching valve and a booster pump disposed on the inflation pipe; the present application monitors the flow rate in the speed-increasing pipe to change the inner diameter of the speed-increasing pipe, and improves convection by changing the diameter of the speed-increasing pipe.

Description

Technical Field

[0001] This application belongs to the technical field of geothermal development, and specifically relates to a device for dynamically adjusting convective enhanced heat transfer. Background Art

[0002] The key equipment for single-well heat extraction from geothermal wells is the downhole heat exchanger (DHE). Different from the ground-coupled heat exchanger, the essential difference is that the downhole heat exchanger mainly extracts heat by the natural convection method of the geothermal water layer at the bottom of the well, while the ground-coupled heat exchanger mainly extracts heat by the heat conduction of the soil around the buried pipes. The single-well heat extraction of the downhole heat exchanger is in the order of hundreds of kilowatts, while that of the ground-source buried pipe heat exchanger is only in the order of a few kilowatts. From the perspective of heating load, the heat extraction of a set of downhole heat exchangers can be two orders of magnitude higher than that of the ground-coupled heat exchanger, and it also has the advantages of not pumping groundwater, no geothermal water discharge, etc., without environmental pollution problems, and can protect groundwater resources.

[0003] In the current downhole heat exchanger system, the above-ground part of the system has no essential difference from other water source heat pump systems, and is composed of a heat pump unit or a heat exchanger and indoor terminals. The condenser and evaporator of the heat pump unit are respectively connected to the user-side radiator and the downhole heat exchanger. In the heating mode, the condenser provides hot water to the user side, and the water in the U-shaped downhole heat exchanger flows back to the geothermal well after being cooled by the evaporator and extracts heat from the groundwater again. The downhole heat exchanger extracts heat through two ways: (1) exchanging heat with the underground hot water flowing through the aquifer; (2) exchanging heat with the surrounding rock of the wellbore. The area inside the wellbore belongs to a pure fluid region, and heat exchange mainly occurs by natural convection, similar to a shell-and-tube heat exchanger. Continuously, the groundwater cooled by the U-shaped tube flows out of the well outside the geothermal wellbore, and the hot water in the external aquifer flows into the well through the wall surface, forming continuous mass exchange to supplement the heat lost in the well and maintain the stability of heat output. The geothermal water layer outside the wellbore belongs to a porous medium region, and heat exchange occurs by both natural convection and heat conduction.

[0004] The thermal output power range of downhole heat exchangers is relatively wide, and there are engineering application examples from the kW level to the MW level. It can be used not only for small-scale household heating but also for heating medium-scale public buildings such as schools. The thermal output power of a downhole heat exchanger project in Turkey reaches 6 MW. Generally speaking, however, downhole heat exchanger systems are mostly used for small and medium-scale heating where a single well can meet the heating demand and the thermal output is usually below 0.8 MW. The well depth of the downhole heat exchanger system is related to the specific local geological and geothermal resource conditions, ranging from more than ten meters to over one hundred meters. Generally, the well depth does not exceed 150 m. Under certain conditions, considering the economy of the system, there are also downhole heat exchanger systems with a depth of up to 450 m. The water temperature in geothermal wells is usually above 40°C; in actual projects, there are geothermal wells with a depth of 12 m and a water temperature of 60°C, as well as geothermal wells with a depth of up to 170 m and a water temperature of 94°C.

[0005] The application research of downhole geothermal heat exchangers mainly includes: (1) Reasonably designing the downhole geothermal heat exchanger system to expand the application fields of downhole geothermal heat exchangers, such as combining with heat pump systems, solar energy utilization systems, and even using thermal energy storage and energy-saving devices, etc. It can be used for road snow melting, providing domestic hot water, etc. in addition to heating. (2) Selecting downhole heat exchangers with new materials and structural forms, such as using chemically corrosion-resistant materials like fiberglass-reinforced epoxy resin pipes, polybutene pipes, or oxygen-barrier cross-linked polyethylene (PEx) pipes to improve the service life of downhole heat exchangers. (3) Strengthening heat transfer technology. If a convection vortex can be formed in the geothermal well, the heat output can be significantly increased, which is also the most important research direction of downhole geothermal heat exchangers. Experimental studies in the United States and New Zealand have pointed out two methods to trigger the convection vortex in the well.

[0006] The first method is for an open wellbore without a sealed gas-proof structure above the wellbore of the downhole heat exchanger. Install a small casing with openings on both end walls in the well, then an open circuit can be formed between the well wall and the casing. The upper opening section is located slightly below the lowest static water level, and the lower opening section is close to the bottom of the well (or the water level of the hot water layer). The heat transfer surface is between the two opening sections. Experiments in Klamath have shown that: when the casing is not installed, the groundwater in the wellbore is static. After the casing is installed, the water flows upward in the casing and downward in the annulus between the casing and the well wall, forming a convection vortex. After installing the downhole heat exchanger and starting to extract heat, a reverse convection vortex is formed. Around the heat exchanger, the cooled water flows downward and upward in the annulus.

[0007] The second method is to use a speed - increasing pipe that can promote the formation of convective vortices in the wellbore, which is superior to the first method. For example, the patent with the publication number "CN114294848A" discloses a medium - depth single - well heat extraction system that uses a convective speed - increasing pipe to enhance heat transfer, including an inner casing disposed in a geothermal well. An inner casing filter pipe is provided at the lower part of the inner casing, and a convective speed - increasing pipe is provided below the inner casing filter pipe. The convective speed - increasing pipe is disposed in an underground aquifer. A convective speed - increasing pipe water inlet is provided at the lower part of the convective speed - increasing pipe, and convective speed - increasing pipe water outlets are symmetrically opened on both sides at the upper part of the convective speed - increasing pipe. The invention is easy to install and has a low cost. By exerting the heat - transfer - enhancing effect of the "convective speed - increasing pipe", it can ensure the circulating heat transfer of the fluid in the wellbore, completely overcome the problem of difficult reinjection. At the same time, it can utilize the convective speed - increasing pipe to enhance the natural convection between geothermal water and the fluid in the pipe, thereby improving the heat extraction efficiency of single - well heat transfer.

[0008] As can be known from the above, the heat - transfer efficiency in a geothermal well is determined by the convective effect, that is, the faster the convection, the faster the heat transfer and the higher the efficiency. The convective speed - increasing pipe plays a certain role. However, the convection inside and outside the speed - increasing pipe is not obvious, the convection is unstable, and the heat transfer is also unstable. Summary of the Invention

[0009] In view of this, the main object of the present invention is to provide a device for dynamically regulating convective heat - transfer enhancement.

[0010] The technical solution adopted by the present invention is as follows:

[0011] The present invention provides a device for dynamically regulating convective heat - transfer enhancement, including:

[0012] A geothermal well, a variable - diameter speed - increasing pipe disposed in the geothermal well, and a U - shaped heat exchanger disposed in the variable - diameter speed - increasing pipe;

[0013] Among them, evenly - spaced support ring sleeves are arranged along the outer side of the U - shaped heat exchanger, and an inflatable expansion ring is arranged outside the support ring sleeves. The inflatable expansion ring is located between the support ring sleeves and the variable - diameter speed - increasing pipe;

[0014] An electronic inflation valve and an electronic deflation valve are arranged on the inflatable expansion ring. Among them, the electronic inflation valve is connected to an inflation tank through an inflation pipe, a switching valve, and a booster pump provided on the inflation pipe;

[0015] A plurality of flow sensors and a first temperature sensor are arranged in the variable - diameter speed - increasing pipe, and a plurality of second temperature sensors are arranged between the variable - diameter speed - increasing pipe and the geothermal well wall;

[0016] A host computer is electrically connected to the electronic inflation valve, the electronic deflation valve, the switching valve, the booster pump, the inflation tank, the flow sensors, the first temperature sensor, and the second temperature sensors respectively;

[0017] The host computer is used to collect the fluid flow information in the variable-diameter and variable-speed tube, the first temperature information inside the variable-diameter and variable-speed tube, and the second temperature information outside the variable-diameter and variable-speed tube at a set period; and to inflate / deflate the inflatable expansion ring by monitoring the change in the fluid flow information in the variable-diameter and variable-speed tube and the temperature difference inside and outside the variable-diameter and variable-speed tube, so as to change the inner diameter of the variable-diameter and variable-speed tube, making the fluid flow in the variable-diameter and variable-speed tube reach the set range.

[0018] Further, the support ring sleeve includes: a set of connecting buckles, one end of each connecting buckle is fixed on the U-shaped heat exchanger, the other end of the connecting buckle is provided with an arc-shaped connecting block, and a support ring is fixed on the outside of the arc-shaped connecting block.

[0019] Further, the inflatable expansion ring is made of rubber material, and one end of the inflatable expansion ring is fixed on the support ring, and the other end is in contact with the support ring sleeve.

[0020] Further, the variable-diameter and variable-speed tube is formed by docking a plurality of variable-diameter and variable-speed tube sections;

[0021] The variable-diameter and variable-speed tube section includes: a plurality of tube segments, the tube segments are connected by elastic rubber to form a closed tube column, and the upper and lower ends of the tube column are open.

[0022] Further, the variable-diameter and variable-speed tube sections are docked and fixed through a tube sleeve.

[0023] Further, installation strips are provided on both sides of the elastic rubber, docking segments are provided on the inner side of each installation strip, and at least one V-shaped bent connecting band or a wavy connecting band is provided between the docking segments.

[0024] Further, fixing grooves are provided on both sides of the tube segment, and a notch is provided on the fixing groove.

[0025] Further, the host computer includes:

[0026] A collection module, which is used to collect the fluid flow information in the variable-diameter and variable-speed tube, the first temperature information inside the variable-diameter and variable-speed tube, and the second temperature information outside the variable-diameter and variable-speed tube at a set period;

[0027] A processing module, which has a first processing unit and a second processing unit; where

[0028] The first processing unit is used to convert the fluid flow information in the variable-diameter and variable-speed tube into an analog signal, then convert the analog signal into a numerical signal, and compare it with a set threshold value to detect whether it is within the set threshold value, forming a first detection result;

[0029] The second processing unit is used to calculate the difference between the first temperature information inside the variable-diameter speed increasing tube and the second temperature information outside the variable-diameter speed increasing tube, and determine whether the difference is within a set range, so as to form a second detection result;

[0030] The control module is used to comprehensively judge based on the first detection result and the second detection result of the processing module to inflate / deflate the inflatable expansion ring, so as to change the inner diameter of the variable-diameter speed increasing tube, so that the fluid flow rate inside the variable-diameter speed increasing tube reaches a set range.

[0031] Further, the control module receives the first detection result and the second detection result;

[0032] When the first detection result is lower than the set threshold, it indicates that the fluid flow rate inside the variable-diameter speed increasing tube is low at this time, and the heat exchange capacity decreases. At this time, the host computer controls the electronic air release valve to open and sets the air release volume according to the first detection result to deflate the inflatable expansion ring. After the inflatable expansion ring deflates, the inner diameter of the variable-diameter speed increasing tube shrinks according to a set ratio, so as to control the fluid flow rate inside the variable-diameter speed increasing tube to increase;

[0033] When the first detection result is greater than the set threshold, the second detection result is greater than the set range, and it is monitored that the heat exchange load of the heat exchanger reaches the upper limit area, the host computer controls the electronic inflation valve to open and sets the inflation volume according to the first detection result to inflate the inflatable expansion ring. After the inflatable expansion ring inflates, the inner diameter of the variable-diameter speed increasing tube expands according to a set ratio, so as to control the fluid flow rate inside the variable-diameter speed increasing tube to decrease, and reduce the heat exchange load by changing the heat exchange load by accelerating the internal fluid flow rate.

[0034] The smaller the diameter of the speed increasing tube, the greater the temperature difference between the inside and outside of the speed increasing tube after heat exchange, the more obvious the pressure difference, the more obvious the convection, and theoretically the higher the heat exchange efficiency. The larger the diameter of the speed increasing tube, the smaller the temperature difference between the inside and outside of the speed increasing tube after heat exchange, the less obvious the convection, and the lower the heat exchange efficiency. Based on this theory, the present application monitors the flow rate inside the speed increasing tube to change the inner diameter of the speed increasing tube and improves the convection by changing the diameter of the speed increasing tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The following drawings are only schematic illustrations and explanations of the present invention and are not used to limit the scope of the present invention,

[0036] Among them:

[0037] Figure 1 is a schematic structural diagram of the present invention;

[0038] Figure 2 is a schematic structural diagram of the variable-diameter speed increasing tube in the present invention;

[0039] Figure 3This is a schematic diagram of the butt joint between the segment and the elastic rubber in the present invention. Detailed implementation manners

[0040] In order to make the purpose, technical solutions, design methods and advantages of the present invention clearer, the present invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0041] Refer to Figure 1 Refer to Figure 3 , the present invention provides a dynamically adjustable convective enhanced heat exchange device, including:

[0042] A geothermal well 100, a variable-diameter speed-increasing pipe 106 arranged in the geothermal well 100, and a U-shaped heat exchanger 102 arranged in the variable-diameter speed-increasing pipe 106;

[0043] Wherein, evenly spaced support ring sleeves 105 are arranged along the outer side of the U-shaped heat exchanger 102, and an inflatable expansion ring 108 is arranged on the outer side of the support ring sleeve 105, and the inflatable expansion ring 108 is located between the support ring sleeve 105 and the variable-diameter speed-increasing pipe 101;

[0044] An electronic inflation valve and an electronic deflation valve are arranged on the inflatable expansion ring 108. Among them, the electronic inflation valve is connected to an inflation tank 116 through an inflation pipe 113, a switching valve 114 and a booster pump 115 arranged on the inflation pipe 113;

[0045] A plurality of flow sensors 107 and a first temperature sensor 110 are arranged in the variable-diameter speed-increasing pipe 106, and a plurality of second temperature sensors 103 are arranged between the variable-diameter speed-increasing pipe 106 and the geothermal well wall 101;

[0046] A host computer 112 is electrically connected to the electronic inflation valve, the electronic deflation valve, the switching valve 114, the booster pump 115, the inflation tank 116, the flow sensors 107, the first temperature sensor 110 and the second temperature sensors 103 respectively;

[0047] The host computer 112 is used to collect the fluid flow information in the variable-diameter speed-increasing pipe 106, the first temperature information in the variable-diameter speed-increasing pipe 106 and the second temperature information outside the variable-diameter speed-increasing pipe at a set period; charge / discharge the inflatable expansion ring 108 by monitoring the change of the fluid flow information in the variable-diameter speed-increasing pipe 106 and the temperature difference inside and outside the variable-diameter speed-increasing pipe, so as to change the inner diameter of the variable-diameter speed-increasing pipe 106, so that the fluid flow in the variable-diameter speed-increasing pipe 106 reaches the set range.

[0048] Further, the support ring sleeve 105 includes: a set of connecting buckles 104, one end of each connecting buckle 104 is fixed on the U-shaped heat exchanger 102, the other end of the connecting buckle 104 is provided with an arc-shaped connecting block, and a support ring is fixed on the outside of the arc-shaped connecting block.

[0049] Further, the inflatable expansion ring 108 is made of rubber material, and one end of the inflatable expansion ring 108 is fixed on the support ring, and the other end is in contact with the support ring sleeve.

[0050] Further, the variable-diameter speed-increasing pipe 106 is formed by docking a plurality of variable-diameter speed-increasing pipe sections;

[0051] The variable-diameter speed-increasing pipe section includes: a plurality of pipe segments 200, the pipe segments 200 are connected by elastic rubber 201 to form a closed pipe column, and the upper and lower ends of the pipe column are open.

[0052] Further, the variable-diameter speed-increasing pipe sections are docked and fixed through pipe sleeves.

[0053] Further, installation strips 204 are arranged on both sides of the elastic rubber 201, a docking section 205 is arranged on the inner side of each installation strip, and at least one V-shaped bent connecting belt 206 or a wavy connecting belt is arranged between the docking sections 205.

[0054] Further, fixing grooves 202 are arranged on both sides of the pipe segment, and a notch 203 is arranged on the fixing groove.

[0055] Further, the host computer includes:

[0056] An acquisition module, configured to acquire the fluid flow information in the variable-diameter speed-increasing pipe, the first temperature information inside the variable-diameter speed-increasing pipe, and the second temperature information outside the variable-diameter speed-increasing pipe according to a set period;

[0057] A processing module, having a first processing unit and a second processing unit; wherein,

[0058] The first processing unit is configured to convert the fluid flow information in the variable-diameter speed-increasing pipe into an analog signal, then convert the analog signal into a numerical signal, and compare it with a set threshold value to detect whether it is within the set threshold value, and form a first detection result;

[0059] The second processing unit is configured to calculate the difference between the first temperature information inside the variable-diameter speed-increasing pipe and the second temperature information outside the variable-diameter speed-increasing pipe, and determine whether the difference is within a set range, and form a second detection result;

[0060] A control module, configured to comprehensively judge based on the first detection result and the second detection result of the processing module to inflate / deflate the inflatable expansion ring, so as to change the inner diameter of the variable-diameter speed increasing pipe, such that the fluid flow rate in the variable-diameter speed increasing pipe reaches a set range.

[0061] Further, the control module receives the first detection result and the second detection result;

[0062] When the first detection result is lower than the set threshold, it indicates that the fluid flow rate in the variable-diameter speed increasing pipe is low at this time and the heat exchange capacity decreases. At this time, the host computer controls the electronic air release valve to open and sets the air release amount according to the first detection result to deflate the inflatable expansion ring. After the inflatable expansion ring is deflated, the inner diameter of the variable-diameter speed increasing pipe shrinks according to a set ratio, so as to control the fluid flow rate inside the variable-diameter speed increasing pipe to increase;

[0063] When the first detection result is greater than the set threshold, the second detection result is greater than the set range, and it is monitored that the heat exchange load of the heat exchanger reaches the upper limit area, the host computer controls the electronic inflation valve to open and sets the inflation amount according to the first detection result to inflate the inflatable expansion ring. After the inflatable expansion ring is inflated, the inner diameter of the variable-diameter speed increasing pipe expands according to a set ratio, so as to control the fluid flow rate inside the variable-diameter speed increasing pipe to decrease, and reduce the heat exchange load by changing through increasing the internal fluid flow rate.

[0064] Among the above, convection is the first factor to be considered. The main factor affecting convection is the temperature difference between the inside and outside of the speed increasing pipe. Only by forming a large temperature difference can obvious convection be formed. In order to form a large temperature difference, generally, only when the diameter of the speed increasing pipe is smaller (however, the diameter of the speed increasing pipe should be greater than the overall width of the U-shaped heat exchanger, at least greater than 20 - 50 cm), the temperature change inside the speed increasing pipe during heat exchange is faster, the temperature difference between the inside and outside of the speed increasing pipe is more obvious, the pressure difference is greater, and the convection is more obvious.

[0065] Among the above, in the initial state, the inflatable expansion ring is in the maximum expansion state. At this time, the diameter of the variable-diameter speed increasing pipe is the largest.

[0066] The present invention also provides a method for dynamically adjusting convective enhanced heat transfer, including the following steps:

[0067] Lower a casing into the formed well to form a geothermal well, lower a U-shaped heat exchanger and a variable-diameter speed increasing pipe into the geothermal well, and the variable-diameter speed increasing pipe is located below the U-shaped heat exchanger; the variable-diameter speed increasing pipe is a pipe with both ends open, suspended between the bottom of the well and the static water level, and seals the cold water layer above the static water level, so that the geothermal well forms a closed well, thereby inducing convection through the variable-diameter speed increasing pipe; wherein, the hot water in the aquifer enters the well through the perforated section of the casing, flows upward along the outside of the variable-diameter speed increasing pipe, the water in the variable-diameter speed increasing pipe is cooled by the U-shaped pipe, and flows downward in the well to form convection;

[0068] The host computer collects the fluid flow information inside the variable-diameter speed-increasing pipe, as well as the first temperature information inside the variable-diameter speed-increasing pipe and the second temperature information outside the variable-diameter speed-increasing pipe at a set period;

[0069] The first processing unit is used to convert the fluid flow information inside the variable-diameter speed-increasing pipe into an analog signal, then convert the analog signal into a numerical signal, and compare it with a set threshold value to detect whether it is within the set threshold value, forming a first detection result;

[0070] The second processing unit is used to calculate the difference between the first temperature information inside the variable-diameter speed-increasing pipe and the second temperature information outside the variable-diameter speed-increasing pipe, and determine whether the difference is within a set range, forming a second detection result;

[0071] Based on the comprehensive judgment of the first detection result and the second detection result of the processing module, the inflation / deflation of the inflatable expansion ring is carried out to change the inner diameter of the variable-diameter speed-increasing pipe, so that the fluid flow inside the variable-diameter speed-increasing pipe reaches the set range;

[0072] Specifically, when the first detection result is lower than the set threshold value, it indicates that the fluid flow inside the variable-diameter speed-increasing pipe is low at this time and the heat exchange capacity decreases. At this time, the host computer controls the electronic air release valve to open and sets the air release volume according to the first detection result to deflate the inflatable expansion ring. After the inflatable expansion ring deflates, the inner diameter of the variable-diameter speed-increasing pipe shrinks according to a set ratio, so as to control the fluid flow inside the variable-diameter speed-increasing pipe to accelerate;

[0073] When the first detection result is greater than the set threshold value, the second detection result is greater than the set range, and it is monitored that the heat exchange load of the heat exchanger reaches the upper limit area, the host computer controls the electronic inflation valve to open and sets the inflation volume according to the first detection result to inflate the inflatable expansion ring. After the inflatable expansion ring inflates, the inner diameter of the variable-diameter speed-increasing pipe expands according to a set ratio, so as to control the fluid flow inside the variable-diameter speed-increasing pipe to decrease, and reduce the heat exchange load by changing through accelerating the internal fluid flow.

[0074] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. Dynamic convection enhanced heat transfer device, It is characterized in that it includes: A geothermal well, a variable-diameter speed-increasing pipe arranged in the geothermal well, and a U-shaped heat exchanger arranged in the variable-diameter speed-increasing pipe; Wherein, evenly spaced support ring sleeves are arranged on the outer side of the U-shaped heat exchanger, and an inflatable expansion ring is arranged on the outer side of the support ring sleeve, and the inflatable expansion ring is located between the support ring sleeve and the variable-diameter speed-increasing pipe; An electronic inflation valve and an electronic deflation valve are arranged on the inflatable expansion ring. Among them, the electronic inflation valve is connected to an inflation tank through an inflation pipe, a switching valve arranged on the inflation pipe, and a booster pump; A plurality of flow sensors and a first temperature sensor are arranged in the variable-diameter speed-increasing pipe, and a plurality of second temperature sensors are arranged between the variable-diameter speed-increasing pipe and the geothermal well wall; A host computer is electrically connected to the electronic inflation valve, the electronic deflation valve, the switching valve, the booster pump, the inflation tank, the flow sensor, the first temperature sensor, and the second temperature sensor respectively; The host computer is used to collect the fluid flow information in the variable-diameter speed-increasing pipe, the first temperature information in the variable-diameter speed-increasing pipe, and the second temperature information outside the variable-diameter speed-increasing pipe according to a set period; by monitoring the change of the fluid flow information in the variable-diameter speed-increasing pipe and the temperature difference inside and outside the variable-diameter speed-increasing pipe, the inflatable expansion ring is inflated / deflated to change the inner diameter of the variable-diameter speed-increasing pipe, so that the fluid flow in the variable-diameter speed-increasing pipe reaches the set range.

2. The dynamic adjustment convective enhanced heat transfer device according to claim 1, wherein; The support ring sleeve includes: a set of connecting buckles, one end of each connecting buckle is fixed on the U-shaped heat exchanger, and an arc-shaped connecting block is arranged at the other end of the connecting buckle, and a support ring is fixed on the outer side of the arc-shaped connecting block.

3. The dynamically adjustable convective enhanced heat transfer device according to claim 1, wherein; The inflatable expansion ring is made of rubber material, and one end of the inflatable expansion ring is fixed on the support ring, and the other end is in contact with the support ring sleeve.

4. The dynamic regulation convective enhanced heat transfer device according to claim 1, characterized in that; The variable-diameter speed-increasing pipe is formed by docking a plurality of variable-diameter speed-increasing pipe sections; The variable-diameter speed-increasing pipe section includes: a plurality of pipe segments, and the pipe segments are connected by elastic rubber to form a closed pipe column, and the upper and lower ends of the pipe column are open.

5. The dynamic adjustment convective enhanced heat transfer device according to claim 4, wherein; The variable-diameter speed-increasing pipe sections are docked and fixed through pipe sleeves.

6. The dynamic regulation convective enhanced heat transfer device according to claim 4, wherein; Installation strips are arranged on both sides of the elastic rubber, a docking section is arranged on the inner side of each installation strip, and at least one V-shaped bent connecting belt or a wavy connecting belt is arranged between the docking sections.

7. The dynamic adjustment convective enhanced heat transfer device according to claim 4, characterized in that; Fixing grooves are arranged on both sides of the pipe segment, and a notch is arranged on the fixing groove.

8. The dynamic adjustment convective enhanced heat transfer device according to claim 1, wherein; The host computer includes: A collection module for collecting the fluid flow information in the variable-diameter speed-increasing pipe, the first temperature information in the variable-diameter speed-increasing pipe, and the second temperature information outside the variable-diameter speed-increasing pipe according to a set period; A processing module having a first processing unit and a second processing unit; wherein, The first processing unit is used to convert the fluid flow information in the variable-diameter speed-increasing pipe into an analog signal, then convert the analog signal into a numerical signal, and compare it with a set threshold value to detect whether it is within the set threshold value, and form a first detection result; The second processing unit is used to calculate the difference between the first temperature information in the variable-diameter speed-increasing pipe and the second temperature information outside the variable-diameter speed-increasing pipe, and determine whether the difference is within the set range, and form a second detection result; A control module, configured to perform inflation / deflation on the inflatable expansion ring based on a comprehensive judgment of a first detection result and a second detection result of a processing module, so as to change the inner diameter of the variable-diameter speed increasing tube, such that the fluid flow rate in the variable-diameter speed increasing tube reaches a set range.

Images