Equipment and method for driving fluid in closed body to move by utilizing fluid expansion and contraction phenomenon

Abstract

The invention provides equipment and a method for driving fluid in a closed body to move by utilizing a fluid expansion and contraction phenomenon, and the equipment for driving the fluid in the closed body to move by utilizing the fluid expansion and contraction phenomenon comprises a closed loop which can contain the fluid and forms a closed closed flow loop for the fluid; the fluid temperature changing device comprises a cooling device and a heating device which are used for respectively and synchronously cooling and heating the fluid, and the cooling device and the heating device are positioned at different positions of the closed loop; wherein the fluid which expands after being heated and contracts after being cooled can move from the heating device to the cooling device, and the moving fluid achieves heat conduction between the inside and the outside of the closed loop at the same time. Therefore, expansion and contraction of the fluid are synchronized by utilizing the phenomena that the fluid expands when heated and contracts when cooled in the flow path system, so that driving force is formed, the fluid is driven to flow from the heating end to the cooling end, and heat conduction is realized. A pumpless fluid delivery and heat transfer scheme is provided.

Description

Technical Field

[0001] This application relates to the field of fluid flow and heat transfer, and particularly to a device and method for driving the movement of fluid in a closed body by utilizing the fluid expansion and contraction phenomenon. Background Art

[0002] If the liquid fluid in a closed-loop system is to achieve circulation, an external driving force is required to realize the movement of the fluid, such as being driven by a pump. The first method known to the inventor is this method of using an external driving force to make the hot fluid flow, so as to push the heat energy carried by the high-temperature fluid to a predetermined target end. The second method known to the inventor is in an open system, first heating the fluid to boiling, and using the steam pressure caused by boiling to push the heat energy carried by the fluid to a predetermined target end. However, for the above two methods, either an external driving force is required, or an open-loop system and boiling pressure are required. In the prior art, there is a lack of a fluid flow and heat transfer system that simultaneously meets the requirements of not using external driving forces such as pumps and boiling pressure, but using the driving force generated by the thermal expansion and contraction of the fluid itself to achieve the flow and heat conduction of the liquid.

[0003] The Chinese invention patent with the publication number "CN105222611A" discloses a "liquid convection device". The characteristic of this liquid convection device is that it can achieve the automatic circulation of liquid in a pipeline without using pump power. It utilizes the energy of a heat source to achieve the automatic circulation of heat energy, and uses the characteristics of thermal expansion and contraction of the liquid. By the density change after the thermal expansion and contraction of the liquid, it promotes the automatic circulation of the liquid. It can be used in any occasion where heat energy conduction is required and there is a certain vertical space, such as placing the storage tank of a solar water heater indoors or driving radiators, CPU heat dissipation in a computer case, etc. However, this liquid convection device is commonly known as a "local heating system" in the industry, and its specific implementation also mentions that "attention should be paid that the liquid used for in-pipeline circulation cannot be filled too full in the main container, otherwise it may overflow from the main container mouth after thermal expansion." This indicates that it is a heat convection heat transfer system in an open system, a system that is connected to the external air environment and is not a closed-loop system. It realizes the flow by using the gravity phenomenon that hot liquid rises and cold liquid descends.

[0004] The Chinese utility model patent with the publication number "CN204079457U" discloses a "fluid automatic conveying device". The conveying device includes a sealed tank, the sealed tank is provided with an input port and an output port, and check valves are respectively arranged at the input port and the output port. The free day-night temperature difference environment in nature is utilized to cause the sealed tank to expand and contract thermally to achieve the automatic conveying of fluid, which is more cost-saving compared to the fluid conveying achieved by driving a motor with electricity. However, this conveying device relies on the natural flow from high pressure to low pressure, and its specific implementation also mentions that "thus, sunlight is concentrated and irradiated on the outer wall of the sealed tank to accelerate the heating of the outer wall of the sealed tank, improve the heating speed and heating temperature of the gas in the sealed tank, so as to increase the expansion amplitude of the gas in the sealed tank, and thereby improve the fluid conveying efficiency." Therefore, it mainly relies on heating the gas and uses the expansion of the gas to push the liquid to convey, rather than directly relying on the thermal expansion of the liquid itself to convey the liquid. In addition, its conveying is also unidirectional. It is a system for fluid conveying by thermal expansion, and it is not a system for the purpose of heat transfer.

[0005] The Chinese invention patent with the publication number "CN108870069A" discloses a "pump-free pressurization process system and its usage method". The system includes an LNG storage tank, at least one pressurization tank and at least one pressurization unit. The first input end of the pressurization tank is connected to the output end of the LNG storage tank; the first output end of the pressurization tank is connected to the input end of the pressurization unit; the second input end of the pressurization tank is connected to the output end of the pressurization unit; the second output end of the pressurization tank is connected to the input end of the vaporizer of the output unit. This pressurization process system can complete the pressurization process by relying on the input of external heat, thus getting rid of the pressurization pump solution. The whole system does not involve the use of any rotating equipment and can be applied to the pressurization of subcooled liquids. However, its specific implementation also mentions that "the cryogenic liquid flows into the pressurization unit by gravity, undergoes a phase change when heated, and the gas at the outlet of the pressurization unit enters the pressurization tank through the gas pressurization valve at the second input end at the top of the pressurization tank and pushes the cryogenic liquid to be output outward through the second output end." Therefore, this pressurization process system is only a system that utilizes thermal expansion for pressurization. Although there is liquid flow, its purpose is pressurization, not flow, let alone heat conduction. Summary of the Invention

[0006] In view of the state of the above-mentioned prior art, this application is made. In a first aspect, this application provides a device that utilizes the expansion and contraction phenomenon of fluid to drive the movement of fluid in a closed body.

[0007] The technical solution adopted in this application may include: a closed-loop circuit, which can accommodate a fluid inside and form a closed-loop flow circuit for the fluid. The closed-loop flow circuit is a single-loop structure, a multi-loop structure, or a loop system; a fluid temperature changing device, which includes a cooling device and a heating device for respectively and synchronously cooling and heating the fluid. The cooling device and the heating device are located at different positions of the closed-loop circuit; among them, the fluid that expands when heated and contracts when cooled can move from the heating device to the cooling device, and the moving fluid simultaneously realizes heat conduction between the inside and the outside of the closed-loop circuit.

[0008] As a further improvement of this application, the cooling device and the heating device are respectively located at two positions in the closed-loop circuit that are at a certain distance apart or corresponding to each other.

[0009] As a further improvement of this application, it further includes a liquid filling device, which can be detachably connected to the closed-loop circuit for filling or discharging liquid to the closed-loop circuit.

[0010] As a further improvement of this application, the closed-loop circuit is provided with a flow rate detection module and a flow velocity detection module.

[0011] As a further improvement of this application, the closed-loop circuit is provided with one or more temperature and pressure monitoring groups. Each temperature and pressure monitoring group includes a high-frequency pressure detection module and a temperature detection module, and the temperature and pressure monitoring group is connected to a total control module.

[0012] As a further improvement of this application, there are two temperature and pressure monitoring groups on the closed-loop circuit, and the two temperature and pressure monitoring groups are arranged in the same section of the closed-loop circuit located between the cooling device and the heating device.

[0013] In the second aspect, a method for driving the movement of fluid in a closed body by using the fluid expansion and contraction phenomenon is provided. It includes: Step S1: Fill the closable closed-loop circuit with a fluid of corresponding density; Step S2: Heat and cool different sections of the fluid in the closed-loop circuit respectively; Step S3: The thermal expansion of the fluid caused by the heating and the cooling contraction of the fluid caused by the cooling are synchronized with each other; Step S4: The thermally expanded fluid moves towards the direction of the fluid with cooling contraction, and the moving fluid conducts heat between the inside and the outside.

[0014] As a further improvement of this application, the heating is continuous heating, and the cooling is continuous cooling; the fluid filled in the closed-loop circuit is a liquid with a density greater than its minimum density value and less than its maximum density value.

[0015] As a further improvement of the present application, the ratio range of the absolute value of the volume change of the fluid caused by heat expansion to the absolute value of the volume change of the fluid caused by cooling contraction is 90% to 110%.

[0016] As a further improvement of the present application, the absolute value of the volume change of the fluid caused by heat expansion is equal to the absolute value of the volume change of the fluid caused by cooling contraction, and the fluid obtains the maximum motion value.

[0017] The beneficial effects of the device for driving the fluid movement in the enclosure by utilizing the fluid expansion and contraction phenomenon of the present application include:

[0018] A new liquid driving device is proposed. This device constructs a sealed flow path system. Without relying on external mechanical power or boiling pressure, but by utilizing the phenomenon of heat expansion and cooling contraction of the fluid itself in the flow path system, the expansion and contraction of the fluid can move synchronously, thereby forming a driving force to drive the fluid to flow from the heating end to the cooling end. Just the relatively high-temperature fluid at the heating end carries a large amount of heat energy, thus realizing the movement and heat conduction of the liquid. This industrial heat transfer device has broad application fields and prospects.

[0019] The closed-loop loop can be a closed pipeline, eliminating external power equipment such as pumps and also eliminating the need to consider the connection and docking problems with pumps. This facilitates improving the sealing performance of the pipeline of the closed-loop loop and also reduces the equipment cost.

[0020] Such fluid flow and heat conduction can be not affected by the gravity effect, and thus can also drive the relatively hot liquid downward. Without being affected by the traditional mindset that high temperature is above and low temperature is below, the flow rate can be quantitatively controlled by the heating device and the cooling device.

[0021] Such a closed-loop loop can drive fluid transportation and achieve heat conduction. This has high heat transfer efficiency and almost no system energy consumption. Although from some perspectives, when using one joule of energy to heat the liquid, the resulting transportation distance may not be very objective, but ultimately all these energies will also conduct heat at the destination end. Heating is not only to change the position of the fluid, but also to enable the fluid to have enough heat for heat exchange. Fluid transportation is an essential process, and heat energy transfer is the purpose. Heating makes the fluid warm up and move at the same time.

[0022] The beneficial effects of the method for driving the fluid movement in the enclosure by utilizing the fluid expansion and contraction phenomenon of the present application include:

[0023] One is to utilize a closed-loop flow path, the second is to utilize the synchronization of the thermal expansion and contraction of the fluid, and the third is to utilize the temperature change and movement of the fluid itself to achieve heat conduction. The synchronization of thermal expansion and contraction means that the decrease in density and increase in volume of the local fluid exactly correspond to the increase in density and decrease in volume of another local fluid, enabling the driving force for fluid transportation to be not only pushing but also suction. The combination of pushing and suction can achieve a synchronous driving effect on the liquid, thus greatly improving the efficiency of fluid transportation. By only performing local heating and local cooling, the two major elements of fluid transportation and heat transfer can be satisfied, with high energy utilization efficiency and the realization of the synchronization of fluid movement and heat conduction.

[0024] This application utilizes the fact that the driving forces of the thermal expansion and contraction of the liquid are much stronger than the gravitational force and other general power sources. It is also applicable to the movement and heat conduction of liquid fluids in a closed cavity with a small diameter. Because the smaller the inner diameter of the cavity, the more obvious the movement distance in the length direction of the cavity due to thermal expansion and contraction for the same volume. And it is also applicable to the movement and heat conduction of liquid fluids in anti-gravity and speed-overload motion devices. Because in the case of limited volume, for example, the force generated by the thermal expansion of water is significantly greater than its own gravity, so it can overcome the negative impact of its own gravity and achieve the counterintuitive function of "heat moving downward". BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0026] Figure 1 It is a schematic diagram of an embodiment of the device for driving the fluid movement in a closed body by utilizing the fluid expansion and contraction phenomenon of the present application;

[0027] Figure 2 It is an application effect diagram of an embodiment of the device for driving the fluid movement in a closed body by utilizing the fluid expansion and contraction phenomenon of the present application;

[0028] Figure 3 It is a flowchart of an embodiment of the method for driving the fluid movement in a closed body by utilizing the fluid expansion and contraction phenomenon of the present application.

[0029] DESCRIPTION OF THE REFERENCE NUMERALS

[0030] 1 - Liquid filling device; 2 - Cooling device; 3 - Heating device; 4 - Closed-loop circuit; 5 - Flow rate detection module; 6 - Flow velocity detection module; 7 - High-frequency pressure detection module; 8 - Temperature detection module; 9 - Total control module; 10 - Temperature and pressure monitoring group; 11 - Branch pipe DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The exemplary embodiments of the present application will be described below with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present application, rather than to exhaust all feasible ways of the present application, nor to limit the scope of the present application.

[0032] The equipment and method of the present application that utilize the fluid expansion and contraction phenomenon to drive the fluid movement in a closed body will be further described in detail below with specific embodiments.

[0033] Refer to Figure 1 , an embodiment of the present application provides an equipment that utilizes the fluid expansion and contraction phenomenon to drive the fluid movement in a closed body. The equipment includes: a closed-loop circuit 4 and a fluid temperature change device. The closed-loop circuit 4 can accommodate fluid inside, and the closed-loop circuit 4 forms a closed-loop flow path for the fluid. The closed-loop flow circuit can be any one of a single-loop structure, a multi-loop structure, and a loop system. The fluid temperature change device includes a cooling device 2 and a heating device 3 that respectively cool and heat the fluid synchronously. The cooling device 2 and the heating device 3 are located at different positions of the closed-loop circuit 4, that is, the cooling device 2 and the heating device 3 respectively cool and heat the fluid at different positions. Among them, the fluid at the heating device 3 will expand due to heat and the fluid at the cooling device 2 will contract due to cooling. The fluid that expands due to heat will move towards the fluid that contracts due to cooling, and the moving fluid conducts heat inside and outside simultaneously. For example, first, the hot fluid will flow inside the closed-loop circuit 4. After reaching the destination end, the hot fluid will conduct heat inside and outside, that is, displace the heat. The position where the heating device 3 is located is the hot input point and the starting point. The position where the cooling device 2 is located is the destination end and the ending point. There will be a certain distance between the heating device 3 and the cooling device 2, and this distance range can be from a few centimeters to several hundred meters, or even a longer distance.

[0034] The single-loop structure is the most basic fluid flow unit, that is, the liquid flows in a closed circulation path. Its flow path is single, but the design is simple and the control difficulty is low, which is suitable for small-scale scenarios. The multi-loop structure is composed of multiple independent single-loop structures combined in parallel, series, or mixed ways. Each loop in the multi-loop structure can operate independently or work together, with high flexibility. The loop system is a comprehensive concept at a higher level than the single-loop structure and the multi-loop structure. The loop system refers to a complete fluid flow network composed of a single-loop structure or a multi-loop structure, and may also include other integrated control elements and control algorithms, which is convenient for providing a complete heat transfer solution in industry.

[0035] The equipment of the present application that utilizes the fluid expansion and contraction phenomenon to drive the fluid movement in a closed body is based on the expansion and contraction phenomena under heat and cold. The expansion and contraction will automatically form acting forces and directions. This is completely different from the spatial flow mode of devices such as heat pipes where the liquid phase flows to the gas phase.

[0036] In one embodiment, the heating form of the heating device 3 can be external (external to the closed-loop circuit 4) electric heating, steam heating, combustion heating, etc. The cooling form of the cooling device 2 can be external (external to the closed-loop circuit 4) air cooling, ice slurry cooling, thermoelectric refrigeration, etc. Additionally, in heat transfer, temperature difference is more commonly used to represent, rather than hot and cold. Therefore, heat transfer is not only limited to conduction from the location of the heating device 3 to the location of the cooling device 2, or vice versa from the location of the cooling device 2 to the location of the heating device 3. As long as there is a temperature difference, heat conduction will occur. A heat transfer device is considered a good one if it can generate a large amount of heat conduction at a relatively small temperature difference.

[0037] In one embodiment, as Figure 1 shown, the cooling device 2 and the heating device 3 are located at two opposite positions of the closed-loop circuit 4. For example, they are spaced apart by approximately 180 degrees in the circumferential direction of the closed-loop circuit 4. The positions of the cooling device 2 and the heating device 3 can be relatively symmetric or asymmetric. Due to the inclination degree on both sides of the closed-loop circuit 4, a gravity difference may be caused, or there may be a slight volume difference in the internal cavity of the closed-loop circuit 4, which in turn causes a mass difference, or differences in the consistency, frictional force of the internal cavity of the closed-loop circuit 4, as well as the influence of other devices installed in the closed-loop circuit 4, all of which can cause changes in the initial fluid flow direction.

[0038] If the cooling device 2 and the heating device 3 are in an asymmetric state on the closed-loop circuit 4, then the fluid flow direction can be distinguished from the asymmetric form. Once the fluid flow state and direction are formed, they generally do not change unless conditions for artificial change are set.

[0039] In a non-limiting example, the specific positions of the cooling device 2 and the heating device 3 are set according to the requirements of heat transfer. That is, the heating device 3 is set at the position where heat energy is required, and the cooling device 2 is set at the position where cooling is required.

[0040] In one embodiment, as Figure 1As shown in the figure, a liquid filling device 1 is externally connected to the closed-loop 4. The closed-loop 4 and the liquid filling device 1 are connected by a branch pipe 11, and a closable filling port is provided at the junction of the branch pipe 11 and the closed-loop 4. The liquid filling device 1 injects a fluid at a certain temperature (such as water) into the closed-loop 4 from the filling port, and finally fills the entire closed-loop 4, then locks the filling port to make the closed-loop 4 closed. Then, the cooling device 2 and the heating device 3 are started. The fluid in the closed-loop 4 will expand due to the heating device 3 and contract due to the cooling device 2. The heated fluid flows from any one side channel of the closed-loop 4 from the heating end to the cooling end, and the fluid temperature at the heating end will be higher than that at the cooling end. At the same time, the cooled fluid flows from the opposite side of the closed-loop 4 from the cooling end to the heating end. As long as the fluid is continuously heated and cooled, the fluid can continuously move from the heating end to the cooling end, and the heat energy can be continuously transported from the heating end to the cooling end through the closed-loop 4.

[0041] In one embodiment, the closed-loop 4 is provided with a flow rate detection module 5 and a flow velocity detection module 6. The flow rate detection module 5 can detect the volume and mass of the fluid, and the flow velocity detection module 6 measures the flow velocity of the fluid. The combination of the two can comprehensively monitor the conveying state of the fluid. The flow rate data reflects the overall conveying efficiency of the system. With the collaborative detection of the two and the control mechanism, cavitation or cavitation caused by sudden changes in flow velocity can be avoided, thereby improving the system stability.

[0042] In one embodiment, the closed-loop 4 is provided with a temperature and pressure monitoring group 10, and each temperature and pressure monitoring group 10 includes a high-frequency pressure detection module 7 and a temperature detection module 8. All temperature and pressure monitoring groups 10 are also connected to the total control module 9 in signal. The high-frequency pressure detection module 7 is convenient for microsecond-level transient capture, can capture water hammer pressure waves, and prevent the pressure peak from exceeding the pipeline pressure resistance level of the closed-loop 4. The temperature detection module 8 can realize phase change monitoring and can detect abnormal overheating of the fluid in time.

[0043] In one embodiment, there are two temperature and pressure monitoring groups 10 on the closed-loop 4, and the two temperature and pressure monitoring groups 10 are arranged on the same side of the closed-loop 4, that is, arranged in the same section of the closed-loop 4 between the cooling device 2 and the heating device 3 (for example, both are arranged on the Figure 1 left side of the cooling device 2 and the heating device 3 in

[0044] In one embodiment, the heating of the heating device 3 in the closed-loop 4 is generally set in points or paragraphs, that is, the heating device 3 and the closed-loop 4 can be in point contact, or in surface contact wrapping a section of the closed-loop 4. The cooling of the cooling device 2 can also be in the form of points or paragraphs, and even the cooling device 2 has a larger surface contact form, such as fins increasing the surface area to improve the cooling effect.

[0045] In one embodiment, the heating device 3 and the closed-loop loop 4 can both be in contact with the outer wall of the pipeline of the closed-loop loop 4. By changing the temperature of the pipeline of the closed-loop loop 4, the temperature of the fluid inside the pipeline is further changed. That is, the heating device 3 and the closed-loop loop 4 do not damage the airtightness of the closed-loop loop 4.

[0046] In one embodiment, the closed-loop loop 4 may not need to be provided with components to prevent backflow, because the flow direction of the fluid is determined by the hot and cold action direction of the closed-loop loop 4 and the resistance direction initially existing in the closed-loop loop 4. Once the flow direction is formed, its flow direction will not change without other external forces. However, sometimes in order to make the flow direction of the fluid in the closed-loop loop 4 stable in a specified direction, for example, one-way valves such as Tesla valves can be added.

[0047] In one embodiment, except for special application scenarios, a stop valve or a lock valve may not be provided. Because as long as the heating and cooling are stopped, such a flow in the closed-loop loop 4 will stop by itself.

[0048] The device of the present application for driving the movement of the fluid in the enclosure by using the fluid expansion and contraction phenomenon can also have an experimental function. For example, the pipeline of the closed-loop loop 4 can be transparent. Using this device, the flow phenomenon can be displayed, the flow process can be verified, and various relevant flow parameters can be obtained, so as to guide such heat conduction applications. The specific verification method can be to fill the closed-loop loop 4 with liquids at different temperatures respectively, and then by adjusting the heating amount of the heating device 3 and the cooling amount of the cooling device 2, and detecting the temperature and pressure changes at both the hot and cold ends respectively, as well as the liquid circulation flow rate and circulation speed of the closed-loop loop 4.

[0049] Taking the example of filling with water at 80°C, fill the closed-loop loop 4 with water at 80°C and turn on the heating device 3 and the cooling device 2. At this time, the water at the heating end of the closed-loop loop 4 will be heated and expanded to generate a certain pressure, while the water at the cooling end will contract due to being cooled and the pressure will decrease. Therefore, the water will move along the direction of this pressure action. Its movement amount depends on the expansion amount VP1 at the hot end and the contraction amount VP2 at the cooling end, and the ratio of the two magnitudes is VP1 / VP2. VP1 is related to the heating amount, and VP2 is related to the cooling amount. The greater the heating and cooling amounts, the higher the expansion and contraction rate, and the greater the liquid movement amount. The closer the ratio of the two is to 1, when VP1 / VP2 = 1, the movement amount is the largest.

[0050] The device of the present application that drives the fluid movement in a closed body by using the fluid expansion and contraction phenomenon does not use a pump. This heat transfer application technology without pump participation has its specific applicable scenarios. For example, in existing pressurized water reactor nuclear power plants, the boiling phenomenon in the nuclear island can be eliminated, but this also makes the water unable to move by itself in the form of steam and send a large amount of heat to the heat exchange end. Instead, a large-flow pump must be used to circulate high-pressure and high-temperature hot water to send the heat to the heat exchange end. If the device of the present application, this technology of pushing hot water flow without a pump, is used, the energy consumption can be greatly reduced, and the system complexity, maintenance work and cost can be reduced. One reason is that no external energy is required, and only the heat at the heating end itself can be used to suppress the boiling phenomenon. The other reason is that relying on the expansion and contraction process of the liquid can carry the heated liquid to the condensation end, eliminating the need for a pump. In addition to being applicable to the application scenarios of pressurized water reactor nuclear power plants, other similar heat transfer scenarios can also be applied. All current closed-loop fluid heat transfer systems driven by pumps and other external energies can use this device.

[0051] The device of the present application that drives the fluid movement in a closed body by using the fluid expansion and contraction phenomenon can calibrate the relative flow rate and heat transfer amount presented by liquids at different temperatures after being filled, so as to provide necessary data for practical applications and determine the fluid flow and heat transfer levels of the device.

[0052] On the other hand, as Figure 3 shown, the present application also provides a method for driving the fluid movement in a closed body by using the fluid expansion and contraction phenomenon. The method includes: Step S1: Fill the closable closed-loop loop 4 with fluid. Step S2: Heat and cool the fluids in different segments of the closed-loop loop 4 respectively. Step S3: Synchronize the thermal expansion of the heated fluid and the cooling contraction of the cooled fluid. Step S4: The heated and expanded fluid moves towards the direction of the cooled and contracted fluid, and internal and external heat conduction is carried out by means of the moving fluid.

[0053] In the specific implementation steps, the fluid in Step S1 is generally a liquid, and a liquid at a preset temperature can be added to the closed-loop loop 4. The liquid in Step S1 must fill the entire closed-loop loop 4. Step S2 heats and cools two end points at a preset relative distance on the closed-loop loop 4 respectively. Step S3 regulates the magnitudes and ratios of heating and cooling.

[0054] This method requires three elements: one is a closed loop; the second is the synchronization of thermal expansion and cold contraction; the third is the fluid movement and the realization of heat conduction. The closed loop requires the fluid to move controllably in the closed-loop loop 4 and not communicate with the external environment. The synchronous driving of heat and cold means that the driving force is not only pushing, but also suction, and it is a synchronous rigid movement that is mutually causal.

[0055] The movement of the fluid is achieved by pushing and pulling the hot end and the cold end of the closed loop 4, and on the other hand, heat is transported from the heating end to the cooling end, realizing the synchronization of fluid movement and heat conduction. If there is only expansion but no contraction in the closed loop 4, the fluid in the closed loop 4 is also difficult to flow, which will only increase the pressure inside the closed loop 4, which is different from an open system.

[0056] In one embodiment, the fluid in step S1 may be a liquid with uniform temperature, and the liquid needs to fill the entire inner cavity of the closed-loop circuit 4 .

[0057] In one embodiment, the closed loop 4 is filled with liquid that has expanded to a certain extent, that is, the density of the liquid at the time of injection is less than its maximum value and greater than its minimum value, and the liquid at the time of injection is not at the maximum limit value or the minimum limit value of its own density. Therefore, the liquid can continue to shrink in the closed loop 4, and can also continue to expand. The liquid in this state can shrink when it is cold and expand when it is heated. For example, the liquid in the closed loop 4 cannot be injected with 4°C water, because the water at 4°C has the highest density and the smallest volume, and it is difficult for it to shrink when it is cold.

[0058] In one embodiment, the optimal ratio of the absolute value of the volume change of the fluid caused by thermal expansion to the volume change of the fluid caused by cooling contraction is 1. The relative optimal ratio ranges from 90% to 110%. Other appropriate ratios can also be selected according to application needs. Considering that in actual engineering applications, the absolute value of the volume change of the fluid caused by thermal expansion and the absolute value of the volume change of the fluid caused by cooling contraction may not be precisely controlled at 1, so 90% to 110% can be a preferred divisor range. The core of the technology is to make the absolute value of the volume change of the fluid caused by thermal expansion and the volume of the fluid caused by cooling contraction as complementary as possible.

[0059] In one embodiment, the absolute value of the volume change of the fluid caused by thermal expansion is equal to the absolute value of the volume change of the fluid caused by cooling contraction. Only when the expansion and contraction are completely consistent can the maximum bidirectional variable be obtained. If there is a large expansion and a small contraction, the variable can only be limited by the relatively small parameter, and the magnitude of the relatively small parameter is obtained. It is not half of the sum of the expansion and contraction. Only by cleverly forming the consistent movement of thermal expansion and cold contraction can the fluid movement in the closed loop be effectively driven through the heat / cold process and heat conduction is achieved.

[0060] In one embodiment, liquids of different densities are selected as working fluids, and the driving forces they embody are different. The driving force exhibited by the liquid with high density is greater than that of the liquid with low density. Because the driving force comes from the pressure difference, the higher the density of the liquid, the greater the pressure increment generated under the same volume expansion.

[0061] In one embodiment, the movement of thermal expansion and cold contraction can be periodic, such as the cooling device 2 and the heating device 3 are turned on and off synchronously several times, or the power of the cooling device 2 and the heating device 3 is increased and decreased synchronously several times. Such periodicity can be regulated by the magnitude of the heating amount and the cooling amount. In principle, it is convenient to regulate the unit delivery amount, delivery frequency, and delivery pressure. Parameters that need to be paid attention to in the process of fluid delivery and heat transfer include: the amount of fluid movement in one expansion and contraction cycle, how many expansions and contractions can be formed per unit time, and how much driving force can be generated during expansion and contraction.

[0062] The method of using the expansion and contraction phenomenon of fluid to drive the movement of fluid in a closed body in the present application can realize the heat transfer and microscopic transportation of fluid, because the fluid after heating and the fluid after cooling do not have any clear macroscopic interface, and this expansion and contraction occurs at a very small microscopic level. Since the expansion and contraction movement is at the microscopic level, or a collection of microscopic levels, it can occur at any distance and can promote the movement of fluid. The length of the distance only affects the length of time of movement, but does not affect the amount and speed of movement of the fluid.

[0063] Compared with macroscopic flow, macroscopic flow is related to the space left in the pipe and the size of the pipe diameter. For example, if the pipe diameter is 1 mm, then the expansion and contraction of 1 ml of liquid volume will produce a movement distance within the 1 mm pipe diameter, which is a spatial concept. If it takes 5 seconds to heat the corresponding fluid, then one movement cycle is the macroscopic movement of the fluid in 5 seconds. Millimeters.

[0064] Microscopic refers to the dense motion state of the fluid as the working medium, because the motion in a closed body is the result of the simultaneous action of expansion and contraction at both ends of heating and cooling. Under such action, the fluid moves while undergoing dense motion under pressure fluctuations. This is a medium-level motion, so it is called microscopic motion. Figure 2 As shown, compared Figure 1 , Figure 2 The master control module 9 is hidden. Figure 2 Several black dots are used to represent the density of the fluid. Figure 2 The cooling device 2 and the heating device 3 shown on the left have not yet participated in changing the temperature, so the distances between adjacent black dots are equal, which means that the density of the fluid is almost equal everywhere. Figure 2 The cooling device 2 and heating device 3 shown on the right are involved in changing the temperature, so the distance between adjacent black dots changes. The distance between black dots near the heating device 3 becomes larger, and the distance between black dots near the cooling device 2 becomes smaller, which means that the density of the fluid changes at various locations, and the fluid also shifts its position at the microscopic level.

[0065] The expansion of the liquid is related to the heating amount of the heating device 3, and the contraction is related to the cooling amount of the cooling device 2. That is, it continuously expands during the heating process and continuously contracts during the cooling process. Although both heating and cooling are continuous, since the expansion or contraction of the liquid requires a process and takes time. In this way, the relative relationship between the liquid flow rate and the heating or cooling amount during the heating and cooling processes is formed. If the flow rate is fast at a certain moment and there is not enough time for heating or cooling, then the liquid flow will slow down or there will be a short-term stagnation. Due to the slowdown or stagnation of the flow, the liquid at the heating device 3 or the cooling device 2 receives a large amount of heat transfer, so the speed of thermal expansion and cooling contraction will increase, and the liquid will accelerate its flow again. In this way, although heating and cooling are continuous, the flow rate of the liquid in the closed body is a periodic motion phenomenon. Such a motion is formed by the interaction of the pushing of the heating device 3 and the suction of the cooling device 2. Therefore, the liquid in the closed loop 4 does not slosh in place, but continuously moves from the heating device 3 to the cooling device 2.

[0066] The motion and heat transfer in the closed body described by the equipment and method of this application are not general working fluid flow phenomena, but relatively complex motion phenomena. It is a combination of the motion of matter and the motion of energy. Liquid flow heat transfer is one of the applications of the equipment and method of this application. However, the equipment and method of this application are not limited to heat transfer, and are also beneficial to the application of pump-free liquid transportation.

[0067] The above embodiments are only for explaining the technical concept and features of this application, and their purpose is to enable those familiar with this technology to understand the content of this application and implement it. It cannot be used to limit the protection scope of this application. Any equivalent changes or modifications made according to the spirit and essence of this application should be covered within the protection scope of this application.

Claims

1. A device that utilizes the expansion and contraction of a fluid to drive the movement of a fluid in a closed body, characterized in that: include: A closed loop (4), wherein the closed loop (4) is capable of accommodating a fluid and forming a closed flow circuit for the fluid, wherein the closed flow circuit is a single-loop structure, a multi-loop structure or a loop system; A fluid temperature changing device, the fluid temperature changing device comprising a cooling device (2) and a heating device (3) for respectively and synchronously cooling and heating the fluid, the cooling device (2) and the heating device (3) being located at different positions of the closed loop (4); The fluid that expands when heated and contracts when cooled can move from the heating device (3) to the cooling device (2), and the moving fluid simultaneously realizes internal and external heat conduction for the closed loop (4).

2. The device according to claim 1, which utilizes the expansion and contraction phenomenon of fluid to drive the movement of fluid in a closed body, is characterized in that: The cooling device (2) and the heating device (3) are respectively located at two positions of the closed loop (4) that are a certain distance apart or corresponding to each other.

3. The device according to claim 1, which utilizes the expansion and contraction phenomenon of fluid to drive the movement of fluid in a closed body, is characterized in that: It also comprises a liquid filling device (1), which is detachably connected to the closed-loop circuit (4) and is used to fill or drain liquid into the closed-loop circuit (4).

4. The device for driving the movement of fluid in a closed body by utilizing the expansion and contraction phenomenon of fluid according to claim 1, characterized in that: The closed loop (4) is provided with a flow detection module (5) and a flow velocity detection module (6).

5. The device for driving the movement of fluid in a closed body by utilizing the expansion and contraction phenomenon of fluid according to claim 1, characterized in that: The closed loop (4) is provided with one or more temperature and pressure monitoring groups (10), each of the temperature and pressure monitoring groups (10) comprises a high-frequency pressure detection module (7) and a temperature detection module (8), and the temperature and pressure monitoring groups (10) are connected to a master control module (9).

6. The device for driving the movement of fluid in a closed body by utilizing the expansion and contraction phenomenon of fluid according to claim 5, characterized in that: The closed-loop circuit (4) is provided with two temperature and pressure monitoring groups (10), and the two temperature and pressure monitoring groups (10) are arranged in the same section of the closed-loop circuit (4) between the cooling device and the heating device.

7. A method for driving the movement of fluid in a closed body by utilizing the expansion and contraction phenomenon of fluid, characterized in that: include: Step S1: Filling the closable closed loop (4) with a fluid of corresponding density; Step S2: heating and cooling the fluid in different sections of the closed loop (4) respectively; Step S3: the thermal expansion of the fluid caused by the heating and the cooling contraction of the fluid caused by the cooling are synchronized with each other; Step S4: the fluid that expands due to heat moves toward the direction of the fluid that contracts due to cooling, and the moving fluid conducts internal and external heat.

8. The method of using the expansion and contraction phenomenon of fluid to drive the movement of fluid in a closed body according to claim 7, characterized in that: The heating is continuous heating, and the cooling is continuous cooling; The fluid filled in the closed loop (4) is a liquid whose density is greater than its minimum density value and less than its maximum density value.

9. The method of using the expansion and contraction phenomenon of fluid to drive the movement of fluid in a closed body according to claim 7, characterized in that: The ratio of the absolute value of the volume change of the fluid caused by the thermal expansion to the absolute value of the volume change of the fluid caused by the cooling contraction ranges from 90% to 110%.

10. The method of using the expansion and contraction phenomenon of fluid to drive the movement of fluid in a closed body according to claim 7, characterized in that: The absolute value of the volume change of the fluid caused by the thermal expansion is equal to the absolute value of the volume change of the fluid caused by the cooling contraction, and the fluid obtains a maximum movement value.

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