A self-driven rotating pulsating heat pipe heat exchange device

Abstract

The present invention belongs to the field of low-temperature waste heat recovery and utilization, heat transfer and mass transfer, and particularly relates to a self-driven rotating pulsating heat pipe heat exchange device, including an axial pulsating heat pipe, a sleeve ring, a radial pulsating heat pipe, fins, guide blades, an upper insulating cylinder, a lower insulating cylinder and an insulating ring cylinder; the radial pulsating heat pipe located in the insulating ring cylinder absorbs the heat of the hot fluid and transfers the heat to the two ends of the axial pulsating heat pipe located in the insulating cylinder, the hot fluid enters the insulating ring cylinder to impact the fins on the radial pulsating heat pipe, and the cold fluid enters the lower insulating cylinder to impact the guide blades, and the generated power drives the pulsating heat pipe bundle to rotate, and under the action of centrifugal force, the liquid working medium in the condensation section of the axial pulsating heat pipe can be returned to the evaporation section of the radial pulsating heat pipe in time, avoiding the "dry burning" phenomenon of the evaporation section of the pulsating heat pipe. The present invention has the advantages of simple structure, high heat exchange efficiency with a small temperature difference, anti-dry burning, energy saving and environmental protection, no need for external power, etc., and is suitable for industrial fields such as chemical industry, metallurgy, and sewage treatment plants.

Description

Technical Field

[0001] The invention belongs to the field of low-temperature waste heat recovery and utilization, heat and mass transfer, and in particular relates to a self-driven rotating pulsating heat pipe heat exchange device. Background Art

[0002] Energy is the material basis for the development of human society. With the progress of economy and society, the reserves of fossil fuels are decreasing, the energy consumption driven by economic development is increasing, and the problem of global energy shortage is becoming increasingly prominent. Along with the energy shortage comes the rapid deterioration of the living environment, air pollution, acid rain, global warming, etc., which seriously threaten the survival and health of human beings. Therefore, energy shortage and serious environmental pollution are the two major problems facing the world today.

[0003] Pulsating heat pipe is a new type of heat pipe that appeared in the 1990s. It mainly relies on temperature difference to drive the self-excited cyclic oscillation flow of the working fluid in the pipe to achieve efficient heat transfer from high temperature to low temperature. It is a vacuum serpentine structure formed by repeatedly bending a capillary with a small inner diameter (generally 0.5mm~5mm). Due to the effect of surface tension, the working fluid liquid plug and working fluid vapor plug are randomly distributed in the pipe. As a new type of heat pipe technology, pulsating heat pipe is widely used in electronic cooling, air conditioning waste heat recovery, solar collectors and other fields due to its simple structure, good heat transfer performance and strong environmental adaptability. Compared with ordinary heat pipes, the pulsation frequency of pulsating heat pipes is much higher than the closed gas-liquid circulation frequency in traditional heat pipes. At the same time, the heat exchange process between the working medium and the wall of the pulsating heat pipe is also enhanced by the action of violent pulsating flow. In addition, pulsating heat pipes do not require capillary cores, which is conducive to reducing costs, and the heating position and heating method are not restricted; they can be bent at will and have a wide range of applications; they have outstanding advantages such as small pipe diameter, light weight, easy miniaturization and rapid startup.

[0004] The main factors affecting the heat transfer performance of pulsating heat pipes include the working fluid in the tube, the filling rate, the heat load, the structure, the inclination angle and the number of elbows. At present, in the known pulsating heat pipe structure, under high heat load, the liquid working fluid in the evaporation section of the pulsating heat pipe evaporates faster, such as the liquid working fluid in the condensation section refluxes to the evaporation section at a slower rate, or when the filling rate is low, the liquid working fluid in the evaporation section is less. In these two cases, the liquid working fluid in the condensation section of the pulsating heat pipe fails to return to the evaporation section in time, causing the evaporation section to "break" or even "dry burning" phenomenon, and ultimately leading to deterioration of heat transfer performance. Summary of the invention

[0005] In order to solve the problem of "dry burning" in the evaporation section of the pulsating heat pipe, the present invention provides a self-driven rotating pulsating heat pipe heat exchange device with high heat exchange efficiency and anti-burning, which can efficiently exchange heat even when the temperature difference between the cold and heat sources is small. No external power is required, and the "dry burning" phenomenon of the pulsating heat pipe can be effectively solved under the action of its own rotational force. Specifically, when the cold and hot fluids enter the heat exchange device, they impact the guide blades and fins respectively, causing the pulsating heat pipe bundle to rotate, and under the action of centrifugal force, the working fluid in the condensation section of the pulsating heat pipe can be returned to the evaporation section in time, thereby avoiding the deterioration of heat transfer caused by the burning of the working fluid in the evaporation section of the pulsating heat pipe, thereby solving the "dry burning" problem of the evaporation section of the pulsating heat pipe.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A self-driven rotating pulsating heat pipe heat exchange device comprises: an insulating shell and a pulsating heat pipe closed circulation connection loop built into the insulating shell and composed of a plurality of axial pulsating heat pipes and radial pulsating heat pipes connected to each other, wherein a plurality of collars are sleeved on the axial pulsating heat pipe, a plurality of fins are sleeved on the radial pulsating heat pipe, and the axial pulsating heat pipe, collar, radial pulsating heat pipe and fins are not in contact with the insulating shell.

[0008] Furthermore, the insulating outer shell includes an upper insulating cylinder, an insulating ring cylinder and a lower insulating cylinder, which are connected in sequence from top to bottom, and the insulating ring cylinder is tightly fixed to the upper insulating cylinder and the lower insulating cylinder, and the axial pulsating heat pipe is located in the upper insulating cylinder and the lower insulating cylinder, and the radial pulsating heat pipe is located in the insulating ring cylinder.

[0009] Furthermore, several axial pulsating heat pipes are fixedly enclosed, and each axial pulsating heat pipe is sleeved with several sleeves with equal spacing. The axial pulsating heat pipe and the sleeves are not in contact with the inner walls of the upper insulation cylinder and the lower insulation cylinder, and there is a certain gap.

[0010] Furthermore, a plurality of radial pulsating heat pipes are radially arranged at a certain angle, a plurality of fins with equal spacing are installed on each radial pulsating heat pipe, and the radial pulsating heat pipe and the fins are not in contact with the inner wall of the insulating ring cylinder, and there is a certain gap; the upper insulating cylinder, the lower insulating cylinder and the insulating ring cylinder are stationary, and the hot fluid enters the insulating ring cylinder to impact the fins, driving the radial pulsating heat pipe to rotate.

[0011] Furthermore, a sleeve is rotatably mounted inside the insulating ring cylinder, and the radial pulsating heat pipe passes through the sleeve and is connected to the axial pulsating heat pipe to form a sealed closed circulation connection loop, and a certain proportion of working fluid is injected into the tube after vacuuming.

[0012] Furthermore, the sleeve is an I-shaped sleeve, which is connected to the insulating ring cylinder through a bearing, and the connection is sealed using oil sealing technology; 4 groups of guide blades are symmetrically installed on the inner wall surface of the sleeve, and the material is aluminum alloy. The installation angle of the guide blades is 40° to 60°, the upper insulating cylinder, the lower insulating cylinder and the insulating ring cylinder are stationary, and the cold fluid enters the lower insulating cylinder to impact the guide blades, driving the axial pulsating heat pipe to rotate.

[0013] Furthermore, a cold fluid outlet is provided at the upper portion of the upper insulating cylinder, and a cold fluid inlet is provided at the lower portion of the lower insulating cylinder; and a hot fluid inlet and a hot fluid outlet of equal caliber are provided on the insulating ring cylinder.

[0014] The heat exchange device of the present invention is environmentally friendly and pollution-free, easy to clean, requires no external power, has low cost, is anti-burning, and can efficiently transfer heat under a small temperature difference. Compared with the existing technology, the present invention has the following beneficial effects: the present invention combines the high-efficiency heat transfer element pulsating heat pipe, the collar and the fin, thereby improving the heat exchange performance of the device. At the same time, since the cold and hot fluids impact the guide blades and the fins respectively, the pulsating heat pipe bundle rotates, and the centrifugal force generated can effectively make the liquid working medium in the axial pulsating heat pipe flow back to the radial pulsating heat pipe, avoiding the "dry burning" phenomenon caused by the "interruption" phenomenon in the radial pulsating heat pipe under high load or low filling rate, thereby enhancing the continuous heat exchange capacity of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of a self-driven rotating pulsating heat pipe heat exchange device according to the present invention;

[0016] Figure 2 A top view of the overall structure of a self-driven rotating pulsating heat pipe heat exchange device according to the present invention;

[0017] Figure 3 This is a schematic diagram of the main structure of a pulsating heat pipe of a self-driven rotating pulsating heat pipe heat exchange device according to the present invention;

[0018] Figure 4 This is a schematic diagram of the structure of an insulating ring cylinder of a self-driven rotating pulsating heat pipe heat exchange device according to the present invention;

[0019] Figure 5 This is a schematic diagram of the sleeve structure of a self-driven rotating pulsating heat pipe heat exchange device according to the present invention;

[0020] In the figure: 1, axial pulsating heat pipe; 2, sleeve ring; 3, radial pulsating heat pipe; 4, fin; 5, sleeve; 6, guide blade; 7, hot fluid inlet; 8, hot fluid outlet; 9-I, upper insulating cylinder; 9-II, lower insulating cylinder; 10, insulating ring cylinder; 11, cold fluid inlet; 12, cold fluid outlet. DETAILED DESCRIPTION

[0021] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several variations and improvements may be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0022] like Figure 1-Figure 5 As shown, a self-driven rotating pulsating heat pipe heat exchange device according to an embodiment of the present invention comprises: an insulating shell formed by an upper insulating cylinder 9-I, an insulating ring cylinder 10 and a lower insulating cylinder 9-II being tightly and fixedly connected in sequence from top to bottom, and a pulsating heat pipe closed circulation communication loop built into the insulating shell and composed of a plurality of axial pulsating heat pipes 1 and radial pulsating heat pipes 3 connected to form a connected loop; wherein: A plurality of axial pulsating heat pipes 1 with an inner diameter ranging from 0.5 mm to 5 mm are fixedly enclosed, and a plurality of sleeve rings 2 with equal spacing are installed on each axial pulsating heat pipe 1. The axial pulsating heat pipe 1 and the sleeve ring 2 are installed inside the upper insulating cylinder 9-I and the lower insulating cylinder 9-Ⅱ, and have no contact with the inner wall of the upper insulating cylinder 9-I and the lower insulating cylinder 9-Ⅱ, and have a certain gap; a plurality of radial pulsating heat pipes 3 with an inner diameter ranging from 0.5 mm to 5 mm pass through the sleeve 5 and are connected to the axial pulsating heat pipe 1 to form a sealed closed circulation connection loop, and a certain proportion of working fluid is injected and sealed to ensure the sealing of all pipes and welding points to avoid air leakage. A plurality of radial pulsating heat pipes 3 are arranged radially at a certain angle, and a plurality of fins 4 with equal spacing are installed on each radial pulsating heat pipe 3. The axial pulsating heat pipe 1 and the fins 4 are installed in the insulating ring cylinder 10, and have no contact with the inner wall of the insulating ring cylinder 10, and have a certain gap. The sleeve 5 can adopt an I-shaped sleeve, and 4 groups of guide blades 6 are arranged on the inner wall surface. The material is aluminum alloy, and the installation angle of the guide blades is 40° to 60°. The sleeve 5 is connected to the insulating ring cylinder 10 through a bearing, and the connection is sealed using oil sealing technology, so that the sleeve 5 can rotate while ensuring the sealing of the connection between it and the insulating ring cylinder 10.

[0023] In this embodiment, the upper insulating cylinder 9-I and the lower insulating cylinder 9-Ⅱ are tightly connected with the insulating ring cylinder 10 by welding. The insulating ring cylinder 10 is provided with a hot fluid inlet 7 and a hot fluid outlet 8 of equal caliber; the upper part of the upper insulating cylinder 9-I is provided with a cold fluid outlet 12, and the lower part of the lower insulating cylinder 9-Ⅱ is provided with a cold fluid inlet 11; the upper insulating cylinder 9-I, the lower insulating cylinder 9-Ⅱ and the insulating ring cylinder 10 are stationary, and the hot fluid enters the insulating ring cylinder 10 to impact the fins 4, driving the radial pulsating heat pipe 3 to rotate; the cold fluid enters the lower insulating cylinder 9-Ⅱ to impact the guide blades, driving the axial pulsating heat pipe to rotate, so that the entire pulsating heat pipe bundle rotates under the joint action of the cold and hot fluids. Specifically: the radial pulsating heat pipe 3 located in the insulating ring cylinder 10 is the evaporation section, and the axial pulsating heat pipe 1 located in the upper insulating cylinder 9-I and the lower insulating cylinder 9-Ⅱ is the condensation section. When the hot fluid enters the insulating ring tube 10 through the hot fluid inlet 7, the hot fluid impacts the fins 4 on the radial pulsating heat pipe 3, driving the radial pulsating heat pipe 3 to rotate counterclockwise. After the working fluid in the radial pulsating heat pipe 3 located in the insulating ring tube 10 absorbs the heat of the hot fluid, the working fluid evaporates and produces a phase change. The bubbles generated by the phase change and the pressure of the evaporation section also increase accordingly, pushing the working fluid to flow to the condensation section. The bubbles in the condensation section condense and shrink or burst, the pressure drops, and the heat is released, and the heat absorbed by the evaporation section is transferred to the axial pulsating heat pipe 1 in the condensation section to dissipate the heat. The cold fluid enters through the cold fluid inlet 11, impacts the guide blades 6 on the inner wall of the sleeve 5, and generates a power in the same direction as the rotation of the radial pulsating heat pipe 3, driving the axial pulsating heat pipe 1 to rotate counterclockwise. Under the action of centrifugal force, the working fluid in the axial pulsating heat pipe 1 in the condensation section can return to the radial pulsating heat pipe 3 in the evaporation section of the periphery in time, and finally store and utilize the heat.

[0024] In this specific implementation, fins 4 are installed on the radial pulsating heat pipe 3 to increase the heat absorption area, and a sleeve ring 2 is installed on the axial pulsating heat pipe 1 to increase the heat dissipation area, so that the axial pulsating heat pipe 1 in the condensation section releases more heat, thereby improving the heat exchange efficiency of the entire device. The sleeve 5 separates the hot fluid entering the insulating ring cylinder 10 from the cold fluid in the lower insulating cylinder 9-Ⅱ and the insulating ring cylinder 10, and they do not mix with each other. When the hot fluid enters the insulating ring cylinder 10, the hot fluid impacts the fins 4 on the radial pulsating heat pipe 3, driving the device to rotate. At the same time, the cold fluid enters the lower insulating cylinder 9-Ⅱ and impacts the guide blades 6, generating power in the same direction as the rotation of the radial pulsating heat pipe 3, driving the axial pulsating heat pipe 1 to rotate counterclockwise. The centrifugal force generated by the rotation enables the working fluid in the axial pulsating heat pipe 1 to return to the radial pulsating heat pipe 3 in time, avoiding the working fluid in the radial pulsating heat pipe 3 in the evaporation section from drying out.

[0025] The present invention utilizes the efficient heat transfer performance of the pulsating heat pipe and utilizes the rotating centrifugal force to avoid the burning of the working medium in the evaporation section of the pulsating heat pipe, so that the device can continuously and efficiently exchange heat and reduce the heat loss of the conventional heat exchanger during operation. The overall structure is simple and easy to install. It can be manufactured in a miniaturized or large-scale manner and can start quickly. It has high heat exchange efficiency and is easy to clean. It does not require external power and is environmentally friendly and energy-saving. It is suitable for industrial sites such as chemical, metallurgical, and sewage treatment plants.

[0026] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various modifications or variations within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A self-driven rotating pulsating heat pipe heat exchange device, Features: include: A heat-insulating shell and a pulsating heat pipe closed circulation connection loop formed by connecting a plurality of axial pulsating heat pipes (1) and radial pulsating heat pipes (3) built into the heat-insulating shell, wherein a plurality of collars (2) are mounted on the axial pulsating heat pipes (1), and a plurality of fins (4) are mounted on the radial pulsating heat pipes (3), and the axial pulsating heat pipes (1), the collars (2), the radial pulsating heat pipes (3), and the fins (4) are not in contact with the heat-insulating shell; The thermal insulation shell comprises an upper thermal insulation cylinder (9-I), a thermal insulation ring cylinder (10) and a lower thermal insulation cylinder (9-II); the upper thermal insulation cylinder (9-I), the thermal insulation ring cylinder (10) and the lower thermal insulation cylinder (9-II) are connected in sequence from top to bottom, and the axial pulsating heat pipe (1) is located in the upper thermal insulation cylinder (9-I) and the lower thermal insulation cylinder (9-II), and the radial pulsating heat pipe (3) is located in the thermal insulation ring cylinder (10); A plurality of axial pulsating heat pipes (1) are fixedly enclosed, and a plurality of sleeve rings (2) with equal spacing are sleeved on each axial pulsating heat pipe (1), and the axial pulsating heat pipe (1) and the sleeve ring (2) are not in contact with the inner walls of the upper insulating cylinder (9-I) and the lower insulating cylinder (9-II), and a certain gap is provided; A plurality of radial pulsating heat pipes (3) are radially arranged at a certain angle, and a plurality of fins (4) with equal spacing are installed on each radial pulsating heat pipe (3). A hot fluid enters the heat-insulating ring cylinder (10) and impacts the fins (4), driving the radial pulsating heat pipe (3) to rotate, and the radial pulsating heat pipe (3) and the fins (4) are not in contact with the inner wall of the heat-insulating ring cylinder (10), and a certain gap is provided.

2. A self-driven rotating pulsating heat pipe heat exchange device as claimed in claim 1, Features: A sleeve (5) is rotatably sleeved inside the heat-insulating ring cylinder (10), and the radial pulsating heat pipe (3) passes through the sleeve (5) and is connected to the axial pulsating heat pipe (1) to form a sealed closed circulation connection loop.

3. A self-driven rotating pulsating heat pipe heat exchange device as claimed in claim 2, Features: The sleeve (5) is an I-shaped sleeve, which is connected to the heat-insulating ring cylinder (10) via a bearing, and the connection is sealed using oil sealing technology.

4. A self-driven rotating pulsating heat pipe heat exchange device as claimed in claim 2, Features: Four groups of guide blades (6) are symmetrically mounted on the inner wall surface of the sleeve (5). The guide blades are made of aluminum alloy and are mounted at an angle of 40° to 60°. Cold fluid enters the lower insulating cylinder (9-Ⅱ) and impacts the guide blades, driving the axial pulsating heat pipe to rotate.

5. A self-driven rotating pulsating heat pipe heat exchange device as claimed in claim 1, Features: The upper insulating cylinder (9-I) is provided with a cold fluid outlet (12) at the top, and the lower insulating cylinder (9-II) is provided with a cold fluid inlet (11) at the bottom.

6. A self-driven rotating pulsating heat pipe heat exchange device as claimed in claim 1, Features: The insulating ring cylinder (10) is tightly fixed to the upper insulating cylinder body (9-I) and the lower insulating cylinder body (9-II), and the insulating ring cylinder (10) is provided with a hot fluid inlet (7) and a hot fluid outlet (8) of equal caliber.

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