A magnetic fluid rotary heat exchanger

Abstract

The present invention discloses a magnetic fluid rotary heat exchanger, which includes a housing body, a magnetic member disposed on the outer surface of the housing body, and a rotor assembly disposed inside the housing body. Multiple rotating tiles are provided on the rotor in the rotor assembly, which increases the heat exchange area. At the same time, magnetic fluid is used as the coolant. Under the action of a magnetic field, the magnetic fluid has a thermomagnetic flow effect, thereby realizing the improvement of the heat exchange rate of the heat exchange device. The magnetic fluid rotary heat exchanger of the present invention has a simple structure, is designed compactly, and each part is relatively independent, which is convenient for maintenance and repair; it has good interchangeability, can achieve modularization, serialization and rapid design; it has no special requirements for the working environment and can adapt to various special environments.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchangers, and particularly to a magnetohydrodynamic rotary heat exchanger. Background Art

[0002] Most of the existing heat exchangers do not transfer the movement process during the heat exchange process, so they cannot be applied to the heat exchange of rotating machinery. At the same time, the heat exchange media applicable to the existing rotary heat exchangers are mostly gases, with low heat exchange efficiency and relatively complex structures, which is not conducive to serialized production.

[0003] Therefore, the existing technology still needs to be improved. Summary of the Invention

[0004] In view of the above deficiencies of the existing technology, the purpose of the present invention is to provide a magnetohydrodynamic rotary heat exchanger, aiming to solve the problems of complex structure and low heat exchange efficiency of the existing heat exchangers.

[0005] The technical solution of the present invention is as follows:

[0006] A magnetohydrodynamic rotary heat exchanger, comprising: an outer housing, a rotor assembly disposed inside the outer housing, a magnetic member disposed on the outer surface of the outer housing, and end caps disposed at both ends of the outer housing; the rotor assembly includes a first rotor and a second rotor, and the first rotor and the second rotor are respectively provided with a first channel for the magnetohydrodynamic to enter and exit the rotor assembly. A flow channel is provided at one end of the first channel, and a plurality of rotating tiles are provided at the other end of the first channel. The plurality of rotating tiles on the first rotor are nested with the plurality of rotating tiles on the second rotor.

[0007] Optionally, in the magnetohydrodynamic rotary heat exchanger, the plurality of rotating tiles are arranged in a circular ring around the first channel.

[0008] Optionally, in the magnetohydrodynamic rotary heat exchanger, the plurality of rotating tiles on the first rotor are arranged in multiple circular rings around the first channel. The diameters of the rings where each layer of rotating tiles is located are different, and the heights of the rotating tiles on each layer of the ring gradually decrease from the center to the outside. A gap for the magnetohydrodynamic to pass through is left between any two adjacent rotating tiles.

[0009] Optionally, in the magnetohydrodynamic rotary heat exchanger, the plurality of rotating tiles on the second rotor are arranged in multiple circular rings around the first channel. The diameters of the rings where each layer of rotating tiles is located are different, and the heights of the rotating tiles on each layer of the ring gradually increase from the center to the outside. A gap for the magnetohydrodynamic to pass through is left between any two adjacent rotating tiles.

[0010] Optionally, in the magnetohydrodynamic rotary heat exchanger, a first groove is provided on the end face of the end cover close to the outer housing, and a first seal is provided in the first groove.

[0011] Optionally, in the magnetohydrodynamic rotary heat exchanger, a rotating member is provided on the flow channel, and a second groove for accommodating the rotating member is provided on the end cover.

[0012] Optionally, in the magnetohydrodynamic rotary heat exchanger, a third groove is further provided in the second groove, and a second seal is provided in the third groove.

[0013] Optionally, in the magnetohydrodynamic rotary heat exchanger, it further includes a heating layer provided between the magnetic member and the outer housing and a heat insulation layer provided on the outer surface of the magnetic member.

[0014] Optionally, in the magnetohydrodynamic rotary heat exchanger, the magnetic member is a magnet or a magnetic field coil.

[0015] Optionally, in the magnetohydrodynamic rotary heat exchanger, the first seal is a magnetic seal.

[0016] Optionally, in the magnetohydrodynamic rotary heat exchanger, the second seal is a magnetic seal.

[0017] Optionally, the magnetohydrodynamic fluid includes a medium and nano-sized magnetite particles dispersed in the medium by a surfactant.

[0018] Optionally, in the magnetohydrodynamic rotary heat exchanger, the magnetohydrodynamic fluid further includes heat-conducting particles dispersed in the medium.

[0019] Optionally, in the magnetohydrodynamic rotary heat exchanger, the heat-conducting particles are one or more of diamond particles, graphite particles, graphene particles, silver particles, and aluminum particles.

[0020] Optionally, in the magnetohydrodynamic rotary heat exchanger, the medium is one or more of deionized water, kerosene, machine oil, phosphate solution, and fluorinated ether oil.

[0021] Beneficial effects: A magnetohydrodynamic rotary heat exchanger provided by the present invention includes a housing, a magnetic member disposed on the housing, and a rotor assembly disposed inside the housing. Multiple rotating tiles are provided on the rotor in the rotor assembly, increasing the heat exchange area. The magnetic member can provide a stable magnetic field environment for the rotor assembly. Under the action of the magnetic field, the thermomagnetic flow effect generated by the magnetohydrodynamic fluid itself is utilized to improve the heat exchange rate of the heat exchange device. The magnetohydrodynamic rotary heat exchanger provided by the present invention has a simple structure, is compactly designed, and each part is relatively independent, facilitating maintenance and repair; it has good interchangeability, can be modularized, serialized, and rapidly designed; it has no special requirements for the working environment and can adapt to various special environments. Description of the Drawings

[0022] Figure 1 Fig. is a perspective view of the magnetohydrodynamic rotary heat exchanger provided by the present invention.

[0023] Figure 2 Fig. is a quarter-rotation sectional view of the magnetohydrodynamic rotary heat exchanger provided by the present invention.

[0024] Figure 3 Fig. is a sectional view of a rotor assembly of the magnetohydrodynamic rotary heat exchanger provided by the present invention.

[0025] Figure 4 Fig. is an exploded view of the magnetohydrodynamic rotary heat exchanger provided by the present invention.

[0026] Figure 5 Fig. is another sectional view of a rotor assembly of the magnetohydrodynamic rotary heat exchanger provided by the present invention.

[0027] Figure 6 Fig. is a schematic structural view of a first rotor.

[0028] Figure 7 Fig. is a schematic structural view of a second rotor.

[0029] Figure 8 Fig. is a schematic structural view of the first rotor from a first perspective.

[0030] Figure 9 Fig. is a sectional view of an end cover of the magnetohydrodynamic rotary heat exchanger provided by the present invention. Detailed Embodiments

[0031] The present invention provides a magnetohydrodynamic rotary heat exchanger. To make the purpose, technical solution and effects of the present invention clearer and more definite, the following further describes the present invention in detail with reference to the accompanying drawings and by way of 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.

[0032] The serial numbers assigned to the components in this text itself, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meaning. And the "connection" and "coupling" mentioned in the present invention, unless otherwise specified, both include direct and indirect connection (coupling). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present invention.

[0033] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0034] As Figures 1-5 shown, the magneto - fluid rotary heat exchanger 1 includes a housing 10, a rotor assembly 20 disposed inside the housing 10, a magnetic member 11 disposed on the outer surface of the housing 10, and end caps 30(31) disposed at both ends of the housing 10; the rotor assembly 20 includes a first rotor 21 and a second rotor 22. First channels 211 for the magneto - fluid to enter and exit the rotor assembly are respectively provided on the first rotor 21 and the second rotor 22. A flow channel 230(240) is provided at one end of the first channel 211, and a plurality of rotating tiles 270(280) are provided at the other end of the first channel 211. The plurality of rotating tiles 270 on the first rotor 21 are nested and connected with the plurality of rotating tiles 280 on the second rotor 22.

[0035] In this embodiment, the magneto - fluid is used as the heat - exchange medium in the heat - exchange process. The magneto - fluid generates a thermomagnetic flow effect under the magnetic field provided by the magnetic member, so that when the magneto - fluid flows through the rotating tiles, it absorbs the heat on the rotating tiles and becomes a high - temperature magneto - fluid, and flows out of the magneto - fluid rotary heat exchanger 1 to achieve heat exchange. Since the magneto - fluid does not affect the relative rotation of the rotors when absorbing heat, heat exchange can be realized during the rotation process.

[0036] Furthermore, a cooling device can be arranged beside the magnetohydrodynamic rotary heat exchanger 1, and the magnetohydrodynamic rotary heat exchanger 1 is connected to the cooling device through a cooling pipeline. The high-temperature magnetohydrodynamic fluid flowing out of the magnetohydrodynamic rotary heat exchanger 1 is cooled by the cooling device, and the cooled magnetohydrodynamic fluid flows into the magnetohydrodynamic rotary heat exchanger 1 again for circulation.

[0037] In this embodiment, the magnetohydrodynamic fluid includes nano-ferroferric oxide particles and a medium, and the medium is deionized water, kerosene, machine oil, phosphate solution, fluorinated ether oil, etc. Among them, the nano-ferroferric oxide particles are mainly prepared by a solid-phase reaction method or a chemical co-precipitation method, and the prepared nano-ferroferric oxide particles are dispersed into deionized water, kerosene, machine oil, phosphate solution, and fluorinated ether oil by a dispersant to obtain the magnetohydrodynamic fluid.

[0038] In one or more embodiments, high thermal conductivity particles are also dispersed in the magnetohydrodynamic fluid. The high thermal conductivity particles can form a fin-like chain structure in the flow channel through magnetic self-assembly under the action of a magnetic field. The high thermal conductivity particles forming the chain structure are dispersed in the magnetohydrodynamic fluid, which can effectively improve the heat conduction efficiency of the magnetohydrodynamic fluid. In this embodiment, by adjusting the intensity of the magnetic field, the length of the chain structure formed by the magnetic self-assembly of the high thermal conductivity particles can be adjusted. The materials of the high thermal conductivity particles are materials with high thermal conductivity such as diamond, aluminum, graphite, and graphene.

[0039] In one or more embodiments, as Figure 2 shown, a heat insulation layer 13 is provided on the outer surface of the magnetic member 11, and a heating layer 12 is provided between the outer housing 10 and the magnetic member 11.

[0040] Specifically, the heat on the heating layer 12 is conducted to the inside of the rotor assembly 20 through the outer housing 10. The heat insulation layer 13 is used to block the outward conduction of the heat on the heating layer 12. The length of the heating layer 12 in the axial direction is less than the length of the outer housing 10 in the axial direction, and the length of the outer housing 10 in the axial direction is less than the length of the heat insulation layer 13 in the axial direction. The magnetic member 11 is an annular magnet or a magnetic field coil wound on the outer surface of the heating layer 12, which is used to provide a magnetic field along the flowing direction of the magnetohydrodynamic fluid.

[0041] Taking heating as an example, the heat exchange process of the magnetohydrodynamic rotary heat exchanger will be explained. Assume that the first rotor 21 in the rotor assembly 20 is the high-temperature end (heat source), and the second rotor 22 is the low-temperature end, and use the first rotor 21 to heat the second rotor 22. Heat the rotor assembly 20 through the heating layer 12, inject the magnetohydrodynamic fluid into the rotor assembly 20 through the flow channel 230, and the first rotor 21 rotates and the magnetohydrodynamic fluid flows in the gap between the rotating tiles. At this time, the first rotor 21 and the second rotor 22 can rotate relative to each other. Under the action of the external magnetic field, the magnetohydrodynamic fluid generates a thermomagnetic effect, and the heat is transported from the first rotor 21 to the second rotor 22, thus realizing heating.

[0042] In one or more embodiments, in combination with Figure 6 and 7 , the rotor assembly 20 includes a first rotor 21 and a second rotor 22. The first rotor 21 and the second rotor 22 each include a rotor body 210. A side wall 2101 is provided around one side surface of the rotor body 210. A first channel 211 is provided at the middle position of the rotor body 210. The first channel 211 can be a circular through hole or a square through hole. Usually, the rotor body 210 is circular, and the side wall 2101 is cylindrical. A flow channel 230 (240) for the magnetohydrodynamic fluid to flow through is provided at one end of the first channel 211. A rotating member 250 (260) is sleeved on the outer surface of the flow channel 230 (240). The rotating member can be a bearing or other components capable of rotating. The rotating member 250 (260) is sleeved on the flow channel 230 (240) and contacts the rotor body 210. Among them, the flow channel can be a circular tube.

[0043] In this embodiment, the first rotor 21 and the second rotor 22 further include a plurality of rotating tiles 270 (280) provided at the other end of the first channel 211, that is, the plurality of rotating tiles 270 (280) are provided inside the side wall 2101.

[0044] In this embodiment, the materials of the first rotor 21 and the second rotor 22 are high thermal conductivity materials. In order to achieve high thermal conductivity of the rotor, a high thermal conductivity material coating or plating can also be provided on the surface of the rotor. The preparation of the coating or plating of the high thermal conductivity material involved is prior art and will not be elaborated here.

[0045] In some embodiments, the plurality of rotating tiles 270 on the first rotor 21 are arranged in a multi-layer circular ring around the first channel 211. The diameters of the circular rings where each layer of rotating tiles is located are different, and the heights of the rotating tiles on each circular ring gradually decrease from the center to the outside. A coolant gap is left between any two adjacent rotating tiles.

[0046] Specifically, the several turning tiles 270 are arranged in multiple concentric circular layers around the center of the first channel 211, that is, multiple circular rings are formed around the first channel 211. The diameters of each circular ring are different, and the distances between the circular rings can be the same or different. The width and height of the turning tiles on the same circular ring are the same. From the inner layer to the outer layer, the width of the turning tiles gradually changes (such as gradually widening), while the height gradually decreases.

[0047] In this embodiment, the several turning tiles 280 on the second rotor 22 are arranged in multiple concentric circular layers around the first channel (not shown in the figure due to the viewing angle). The diameters of the circular rings where each layer of turning tiles is located are different, and the height of the turning tiles on each circular ring gradually increases from the center outwards. A coolant passage gap is left between any two adjacent turning tiles.

[0048] Specifically, the several turning tiles 280 are arranged in multiple concentric circular layers around the center of the first channel 221, that is, multiple circular rings are formed around the first channel 221. The diameters of each circular ring are different, and the distances between the circular rings can be the same or different. The width and height of the turning tiles on the same circular ring are the same. From the inner layer to the outer layer, the width of the turning tiles gradually changes (such as gradually widening), while the height gradually increases. Since the height change trend of the turning tiles 270 on the first rotor 21 is opposite to that of the turning tiles 280 on the second rotor 22, when the first rotor 21 and the second rotor 22 are matched, a part of the turning tiles 270 is located inside the circular ring formed by the turning tiles 280.

[0049] In some embodiments, the several turning tiles 270 (280) on the first rotor 21 (22) are arranged in multiple concentric circular layers around the first channel 211. The diameters of the circular rings where each layer of turning tiles is located are different, and the height of the turning tiles on each circular ring is the same from the center outwards. A coolant passage gap is left between any two adjacent turning tiles. When the first rotor 21 and the second rotor 22 are matched, the turning tiles 270 are embedded into the gaps between the turning tiles 280, and at the same time, the turning tiles 280 are embedded into the gaps between the turning tiles 270. It can be seen from Figure 4 that the turning tiles 270 (280) are in a stacked state.

[0050] In some embodiments, in combination with Figure 8 , the several turning tiles 270 (280) are arranged in a circular ring around the first channel 211. As an example, if there are n turning tiles, the n turning tiles can be arranged in circles around the center of the first channel 211 from the inside out. The width of the turning tiles gradually increases from the inside out.

[0051] Furthermore, the rotor body 210 can be partitioned. For example, the bottom of the rotor body 210 can be divided into 2 regions, 3 regions, 4 regions, 5 regions, 6 regions, etc. Taking the division into 6 regions as an example, for instance, the bottom of the rotor body 210 is evenly divided into 6 fan-shaped regions, labeled as A1, A2, A3, A4, A5, and A6. 5 rotating tiles are arranged in each fan-shaped region, and the 5 rotating tiles are arranged in sequence from the inside to the outside. The width and height of the tiles located within the same radius are the same, although they can also be set differently. For example, the width of the rotating tiles located within the same radius can be reduced or increased according to a certain ratio, and the height can also be adjusted in the same way. There is a certain distance between the regions A1 - A6, and there is also a gap between two adjacent rotating tiles in each region, through which the coolant can pass.

[0052] In this embodiment, in combination with Figure 9 , the end cap 30(31) is usually circular, and the material used is a non-magnetic material. A second channel 310 is provided in the middle of the end cap 30(31), and the shape of the second channel 310 is adapted to the shape of the flow channel 230(240). Since the flow channel 230(240) is circular, the shape of the second channel 310 is circular. During assembly, the end cap 30(31) is passed through the flow channel 230(240) so that the end cap is closely attached to the end of the housing, sealing the housing 11 to prevent the coolant inside the rotor assembly 20 from leaking out. Usually, in order to obtain a better sealing effect, a first groove 330 can be opened on the end face of the outer edge inner side of the end cap 30(31) near the opening of the housing body 10, and a first magnetic seal 331(341) is provided in the first groove 330. The first magnetic seal 331(341) is a magnetic sealing ring. Common materials for magnetic sealing rings include neodymium iron boron permanent magnets and ferrite permanent magnets. It mainly utilizes the characteristic that the magnetic viscosity of the magnetic fluid increases under the action of the magnetic field for sealing.

[0053] Furthermore, a second groove 350 for accommodating the rotating member 250(260) is provided on the end face of the second channel 310 near the housing body 10. In order to prevent the coolant from leaking out from the second channel 310, a third groove 370 is opened in the second groove 350, and a second magnetic seal 371(381) is provided in the third groove 370. The second magnetic seal 371(381) is a magnetic sealing ring. Common materials for magnetic sealing rings include neodymium iron boron permanent magnets and ferrite permanent magnets. It mainly utilizes the characteristic that the magnetic viscosity of the magnetic fluid increases under the action of the magnetic field for sealing.

[0054] As an example, the magnetic fluid rotary heat exchanger provided by the present invention can be used to transport the heat generated during mechanical rotation to the outside, thereby achieving a cooling effect.

[0055] Specifically, the magnetorheological fluid coolant is injected into the rotor assembly through the flow channel. The rotor assembly rotates, and the magnetorheological fluid coolant flows in the gap between the rotating tiles under the action of the radial magnetic field. Under the action of the magnetic field, the thermomagnetic flow effect generated by the magnetorheological fluid itself is utilized to improve the heat exchange rate of the heat exchange device. As the rotor rotates, heat is absorbed during the rotation process, thereby achieving a cooling effect. It can be understood that the heating layer does not work during the cooling process.

[0056] In summary, a magnetorheological fluid rotary heat exchanger provided by the present invention includes: a housing body, a heating layer provided on the outer surface of the housing, a magnetic member provided on the surface of the heating layer, and a heat insulation layer provided on the outer surface of the magnetic member; a rotor assembly disposed inside the housing, the rotor assembly including a first rotor and a second rotor, the first rotor and the second rotor being disposed opposite to each other; each of the first rotor and the second rotor includes a rotor body, a first channel opened in the middle of the rotor body, a flow channel provided at one end of the first channel, a rotating member sleeved on the flow channel, and a plurality of rotating tiles provided at the other end of the first channel; and end caps respectively provided at both ends of the housing, the end caps being provided with second channels, the flow channel passing through the second channels and being exposed outside the end caps, and the housing being sealed by the end caps. The magnetic member in the housing body can provide a stable magnetic field environment. The rotor assembly disposed inside the housing body has a plurality of rotating tiles provided on the rotor in the rotor assembly, increasing the heat exchange area. Under the action of the magnetic field, the thermomagnetic flow effect generated by the magnetorheological fluid itself is utilized to improve the heat exchange rate of the heat exchange device. The magnetorheological fluid rotary heat exchanger provided by the present invention has a simple structure, is compactly designed, and each part is relatively independent, facilitating maintenance and repair; has good interchangeability, can be modularized, serialized, and rapidly designed; has no special requirements for the working environment and can adapt to various special environments.

[0057] It should be understood that the application of the present invention is not limited to the above examples. For those of ordinary skill in the art, improvements or transformations can be made according to the above description, and all such improvements and transformations should fall within the protection scope of the appended claims of the present invention.

Claims

1. A magnetohydrodynamic rotary heat exchanger, characterized in that, It includes a housing, a rotor assembly disposed inside the housing, a magnetic member disposed on the outer surface of the housing, and end caps disposed at both ends of the housing; the rotor assembly includes a first rotor and a second rotor, and the first rotor and the second rotor are respectively provided with a first channel for the magnetic fluid to enter and exit the rotor assembly. A flow channel is provided at one end of the first channel, and a plurality of rotating tiles are provided at the other end of the first channel. The plurality of rotating tiles on the first rotor are nested with the plurality of rotating tiles on the second rotor. The magnetic fluid includes a medium and nano-ferroferric oxide particles dispersed in the medium by a surfactant.

2. The magnetohydrodynamic rotary heat exchanger according to claim 1, characterized in that, The plurality of rotating tiles are arranged in a circular ring around the first channel.

3. The magnetohydrodynamic rotary heat exchanger according to claim 2, characterized in that, The plurality of rotating tiles on the first rotor are arranged in multiple circular rings around the first channel. The diameters of the rings where each layer of rotating tiles is located are different, and the height of the rotating tiles on each ring decreases step by step from the center to the outside. A gap for the magnetic fluid to pass through is left between any two adjacent rotating tiles.

4. The magnetohydrodynamic rotary heat exchanger according to claim 3, characterized in that, The plurality of rotating tiles on the second rotor are arranged in multiple circular rings around the first channel. The diameters of the rings where each layer of rotating tiles is located are different, and the height of the rotating tiles on each ring increases step by step from the center to the outside. A gap for the magnetic fluid to pass through is left between any two adjacent rotating tiles.

5. The magnetohydrodynamic rotary heat exchanger according to any one of claims 1-4, characterized in that, A first groove is provided on the end face of the end cap close to the housing, and a first seal is provided in the first groove.

6. The magnetohydrodynamic rotary heat exchanger according to claim 1, characterized in that, A rotating member is provided on the flow channel, and a second groove for accommodating the rotating member is provided on the end cap.

7. The magnetohydrodynamic rotary heat exchanger according to claim 6, characterized in that, A third groove is further provided in the second groove, and a second seal is provided in the third groove.

8. The magnetohydrodynamic rotary heat exchanger according to claim 1, characterized in that, It further includes a heating layer disposed between the magnetic member and the housing and a heat insulation layer disposed on the outer surface of the magnetic member.

9. The magnetohydrodynamic rotary heat exchanger according to claim 1, characterized in that, The magnetic member is a magnet or a magnetic field coil.

10. The magnetohydrodynamic rotary heat exchanger according to claim 5, characterized in that, The first seal is a magnetic seal.

11. The magnetohydrodynamic rotary heat exchanger according to claim 7, characterized in that, The second seal is a magnetic seal.

12. The magnetohydrodynamic rotary heat exchanger according to claim 1, characterized in that, The magnetic fluid further includes heat-conducting particles dispersed in the medium.

13. The magnetohydrodynamic rotary heat exchanger according to claim 12, characterized in that, The heat-conducting particles are one or more of diamond particles, graphite particles, graphene particles, silver particles, and aluminum particles.

14. The magnetohydrodynamic rotary heat exchanger according to claim 1, characterized in that, The medium is one or more of deionized water, kerosene, machine oil, phosphate solution, and fluorinated ether oil.

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