Magnetic stirring fused salt heat storage and heat exchange device

Abstract

The utility model belongs to the technical field of fused salt energy storage, and provides a magnetically-stirred fused salt heat storage and exchange device which comprises a tank body, a heat exchange pipeline is arranged on the tank wall of the tank body, and the tank body is suitable for being filled with a fused salt heat storage material; the heating device is inserted into the fused salt heat storage material in the tank body in the vertical direction, and the heating device is used for heating the fused salt heat storage material; the stirring shaft is rotatably inserted into the fused salt heat storage material from the tank top of the tank body in the vertical direction, the part, located in the tank body, of the stirring shaft is provided with a spiral blade, and the upper end of the stirring shaft is exposed out of the tank body; the driving motor is arranged on the tank top of the tank body; the magnetic coupling comprises a driving end and a driven end, the driving end is connected to the driving motor, and the driven end is coaxially fixed to the upper end of the stirring shaft. The temperature consistency of the fused salt in the tank body can be improved, and meanwhile the risk that the driving motor and the transmission assembly are damaged due to high temperature can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of molten salt energy storage, in particular to a molten salt heat storage and heat exchange device with magnetic stirring. BACKGROUND

[0002] There is a molten salt heat storage and heat exchange device, which comprises a molten salt tank, an electric heating unit and a heat exchange pipeline, the molten salt tank is filled with molten salt, the electric heating unit is inserted into the molten salt in the tank from the top of the molten salt tank, the electric heating unit is used for heating the molten salt, and the heat exchange pipeline comprises an inlet close to the bottom of the molten salt tank and an outlet close to the top of the molten salt tank.

[0003] When the molten salt heat storage and heat exchange device stores heat, the electric heating unit heats the molten salt to be molten, the density of the molten salt decreases with the increase of the temperature, and the higher the temperature of the molten salt, the smaller the density. With the continuation of the heating process, the molten salt with higher temperature and smaller density rises, and the molten salt with lower temperature and larger density sinks, and the heat of the lower molten salt is transmitted upward, so that the heat is concentrated in the upper molten salt. When the upper molten salt is heated to the highest use temperature, the electric heating unit stops working, but at this time the temperature of the lower molten salt in the tank is still low, the temperature distribution of the molten salt in the tank is high at the top and low at the bottom, and the heat storage capacity of the lower molten salt in the tank is not fully utilized, resulting in cost waste.

[0004] When the molten salt heat storage and heat exchange device releases heat, the water enters from the bottom and exits from the top, and the heat exchange pipeline comprises a preheating section, a boiling section and a superheating section from bottom to top. The heat transfer coefficient, heat transfer temperature difference and heat transfer amount of the preheating section and the boiling section are significantly higher than those of the superheating section, so the temperature of the lower molten salt in the molten salt tank decreases faster than that of the upper molten salt, which also promotes the temperature distribution of the molten salt in the tank to be high at the top and low at the bottom, resulting in that the heat release capacity of the upper molten salt in the tank is not fully utilized. CONTENT OF THE INVENTION

[0005] To address the aforementioned problems, this application provides a magnetically stirred molten salt thermal storage and heat exchange device with ingenious design and simple structure. By inserting a stirring shaft from the top of the tank into the tank body and using a drive motor to drive the upper end of the stirring shaft, the entire stirring shaft rotates. This avoids openings at the bottom of the tank, reducing the risk of leakage. Furthermore, placing the drive assembly on the top of the tank does not alter the original force distribution at the bottom of the tank (the bottom of the tank rests on a horizontal bearing surface), ensuring uniform force distribution. On the other hand, the magnetic coupling enables non-contact transmission between the drive motor output and the stirring shaft, preventing heat from the stirring shaft from being directly transferred to the drive motor and related components directly connected (contact connection) via heat conduction, thus reducing the risk of damage to the drive motor and related components due to high temperatures. In this application, both the driving and driven ends of the magnetic coupling are located outside the tank body, further reducing the risk of damage to the driven end due to high temperatures. This application improves the stirring effect of molten salt in the tank by setting helical blades on the stirring shaft, allowing molten salt at different heights in the tank to be fully mixed. This improves the temperature uniformity of the molten salt in the vertical direction, thereby increasing the utilization rate of the molten salt's heat storage and release capacity. The technical solution adopted in this application is as follows:

[0006] A magnetically stirred molten salt thermal storage and heat exchange device, comprising:

[0007] The tank comprises a tank body with heat exchange pipes on its walls, and is suitable for filling molten salt thermal storage material; a heating device inserted vertically into the molten salt thermal storage material within the tank body for heating the material; a stirring shaft rotatably inserted vertically into the molten salt thermal storage material from the top of the tank body, the portion of the stirring shaft inside the tank body having helical blades, and the upper end of the shaft protruding from the tank body; a drive motor mounted on the top of the tank body; and a magnetic coupling comprising a driving end and a driven end, the driving end and the driven end being non-contactly connected, the driving end rotating to drive the driven end to rotate, the driving end being connected to the drive motor, and the driven end being coaxially fixed to the upper end of the stirring shaft; through the magnetic coupling, the drive motor can drive the stirring shaft to rotate, thereby causing the helical blades to stir the molten salt thermal storage material.

[0008] The stirring shaft is inserted into the tank body from the tank top, and the upper end of the stirring shaft is driven by the driving motor, and then the whole stirring shaft is driven to rotate, which avoids opening a hole in the bottom of the tank body and reduces the risk of leakage of the tank body. In addition, the driving assembly is arranged on the tank top, which does not change the original stress distribution form of the bottom of the tank body (the bottom of the tank body is placed on a horizontal bearing base surface), and the bottom of the tank body is still uniformly stressed. On the other hand, through the magnetic coupling transmission, the non-contact transmission between the output end of the driving motor and the stirring shaft is realized, so that the heat of the stirring shaft cannot be directly transmitted to the driving motor and the related components directly connected (contact connection) with the driving motor in the form of heat conduction, thereby reducing the risk of damage of the driving motor and the related components due to high temperature. In the present application, the driving end and the driven end of the magnetic coupling are located outside the tank body, which reduces the risk of damage of the driven end due to high temperature. In the present application, the helical blade is arranged on the stirring shaft, which improves the stirring effect of the molten salt in the tank, so that the molten salt at different heights in the tank can be fully mixed, the consistency of the molten salt temperature in the tank in the height direction is improved, and the utilization rate of the heat storage and heat release capacity of the molten salt is improved.

[0009] In some embodiments, a transmission gear set is further included, and the driving motor drives the driving end to rotate through the transmission gear set.

[0010] By arranging the transmission gear set, the driving motor and the driving end transmit power through the transmission gear set, so that the driving motor can be flexibly arranged, and the requirement of space for arranging the driving motor is reduced.

[0011] In some embodiments, the transmission gear set includes a driving gear and a driven gear which are engaged with each other, and the axis of the driving gear and the axis of the driven gear are perpendicular to each other; the driving motor is fixed horizontally on the tank top of the tank body through a motor fixing support, and the driving gear is installed on the output end of the driving motor; the driven gear and the driving end are respectively installed on two ends of a connecting shaft, and the connecting shaft is rotatably fixed on the tank top of the tank body through a bearing fixing support.

[0012] By arranging the driving motor horizontally and making the axis of the driving gear and the axis of the driven gear perpendicular to each other, the height of the whole molten salt heat storage and heat exchange device after the driving motor is installed can be reduced, and the height space can be saved.

[0013] In some embodiments, the driving motor is fixed vertically on the tank top of the tank body through a motor fixing support and located beside the axis of the magnetic coupling.

[0014] By arranging the driving motor vertically and arranging the driving motor beside the axis of the magnetic coupling, compared with the technical solution that the output end of the driving motor is directly connected with the driving end of the magnetic coupling, the height of the whole molten salt heat storage and heat exchange device after installation of the driving motor can be reduced, and the height space is saved.

[0015] In some embodiments, the driving motor is fixed vertically on the top of the tank body through a motor fixing support, and the output end of the driving motor is directly connected with the driving end of the magnetic coupling.

[0016] By directly connecting the output end of the driving motor with the driving end of the magnetic coupling, compared with the transmission between the driving motor and the driving end through the transmission gear set, the driving efficiency of the driving motor can be ensured.

[0017] In some embodiments, the part of the stirring shaft exposed to the tank body is sleeved with a fixed bearing, and the fixed bearing is fixed on the top of the tank body through a bearing fixing support.

[0018] By sleeving the part of the stirring shaft exposed to the tank body with the fixed bearing, the fixed bearing is located outside the tank body, and the risk of damage of the fixed bearing due to high temperature in the tank can be reduced.

[0019] In some embodiments, the part of the stirring shaft located in the tank body is provided with a stirring support, and the stirring support is larger than the helical blade in the radial dimension of the tank body.

[0020] By arranging the stirring support, on the one hand, the stirring and mixing effect of the molten salt can be improved, the consistency of the molten salt temperature in the height direction and the radial direction of the tank body can be improved, and the utilization rate of the molten salt heat storage and heat release capacity can be improved, and on the other hand, the stirring support can play a role in heat transfer, the temperature of the molten salt in the tank body can be balanced, and the consistency of the molten salt temperature in the height direction and the radial direction of the tank body can be further ensured.

[0021] In some embodiments, the stirring support includes at least two horizontal rods and at least two vertical rods, the horizontal rods are perpendicular to the stirring shaft, the vertical rods are parallel to the stirring shaft, and the horizontal rods and the vertical rods are connected to form the rectangular stirring support.

[0022] In some embodiments, the part of the stirring shaft exposed to the tank body is provided with heat dissipation fins. By arranging the heat dissipation fins on the part of the stirring shaft exposed to the tank body, the heat dissipation fins are used for heat dissipation of the exposed part of the stirring shaft, play a role in reducing the temperature of the exposed part of the stirring shaft, and can reduce the risk of damage of components directly contacting the stirring shaft due to high temperature.

[0023] In some embodiments, a cooling coil is further arranged around the exposed part of the stirring shaft outside the tank body in a spiral shape; cooling water is circulated in the cooling coil to cool the exposed part of the stirring shaft; and the cooling water heated by the cooling coil is finally circulated in the heat exchange pipe.

[0024] By arranging the cooling coil on the exposed part of the stirring shaft, on the one hand, the temperature of the exposed part of the stirring shaft is reduced, and the risk of damage to the components in direct contact with the stirring shaft due to high temperature is reduced; on the other hand, the heat transferred to the stirring shaft by the molten salt is utilized, energy waste is reduced, and energy efficiency is improved.

[0025] The magnetic stirring molten salt heat storage and heat exchange device provided by the present application has at least one of the following beneficial effects:

[0026] 1. The magnetic stirring molten salt heat storage and heat exchange device provided by the present application avoids opening a hole in the bottom of the tank body by inserting the stirring shaft into the tank body from the top of the tank and driving the upper end of the stirring shaft by the driving motor to drive the whole stirring shaft to rotate, thereby reducing the risk of leakage of the tank body. In addition, the driving assembly is arranged on the top of the tank, which does not change the original stress distribution form of the bottom of the tank (the bottom of the tank is placed on a horizontal bearing base surface), and the bottom of the tank is still uniformly stressed. On the other hand, by using the magnetic coupling transmission, non-contact transmission between the output end of the driving motor and the stirring shaft is realized, so that the heat of the stirring shaft cannot be directly transferred to the driving motor and the related components directly connected (contact connection) with the driving motor by heat conduction, thereby reducing the risk of damage to the driving motor and the related components due to high temperature. In the present application, the driving end and the driven end of the magnetic coupling are located outside the tank body, thereby reducing the risk of damage to the driven end due to high temperature. In the present application, the spiral blades are arranged on the stirring shaft to improve the stirring effect of the molten salt in the tank, so that the molten salt at different heights in the tank can be fully mixed, the consistency of the temperature of the molten salt in the tank in the height direction is improved, and the utilization rate of the molten salt heat storage and heat release capacity is improved.

[0027] 2. The magnetic stirring molten salt heat storage and heat exchange device provided by the present application transmits power between the driving motor and the driving end through the transmission gear set, so that the driving motor can be flexibly arranged, and the requirement of space for arranging the driving motor is reduced.

[0028] 3. The magnetic stirring molten salt heat storage and heat exchange device provided by the present application places the driving motor horizontally and arranges the axis of the driving gear and the axis of the driven gear perpendicular to each other, thereby reducing the height of the whole molten salt heat storage and heat exchange device after the driving motor is installed, and saving the height space.

[0029] 4. The molten salt heat storage and heat exchange device with magnetic stirring provided in the application can reduce the height of the entire molten salt heat storage and heat exchange device after the installation of the driving motor and save the height space by vertically arranging the driving motor and arranging the driving motor beside the axis of the magnetic coupling.

[0030] 5. The molten salt heat storage and heat exchange device with magnetic stirring provided in the application can ensure the driving efficiency of the driving motor by directly connecting the output end of the driving motor with the driving end of the magnetic coupling.

[0031] 6. The molten salt heat storage and heat exchange device with magnetic stirring provided in the application can reduce the risk of damage of the fixed bearing due to high temperature in the tank by sleeving the part of the stirring shaft exposed to the tank body with the fixed bearing.

[0032] 7. The molten salt heat storage and heat exchange device with magnetic stirring provided in the application can improve the stirring and mixing effect of the molten salt, improve the consistency of the molten salt temperature in the height direction and the radial direction of the tank body, and further improve the utilization rate of the molten salt heat storage and heat release capacity by arranging the stirring support.

[0033] 8. The molten salt heat storage and heat exchange device with magnetic stirring provided in the application can reduce the risk of damage of the components directly contacting with the stirring shaft due to high temperature by arranging the heat dissipation fins on the part of the stirring shaft exposed to the tank body.

[0034] 9. The molten salt heat storage and heat exchange device with magnetic stirring provided in the application can reduce the risk of damage of the components directly contacting with the stirring shaft due to high temperature by arranging the cooling coil on the exposed part of the stirring shaft. BRIEF DESCRIPTION OF DRAWINGS

[0035] The above-mentioned characteristics, technical features, advantages and implementation modes of the molten salt heat storage and heat exchange device with magnetic stirring will be further described in the following preferred embodiments combined with the drawings:

[0036] Figure 1 is a structural schematic diagram of an embodiment of the driving motor horizontally arranged in the application;

[0037] Figure 2 is a structural schematic diagram of an embodiment of the vertical arrangement of the driving motor in the present application;

[0038] Figure 3 is a structural schematic diagram of an embodiment of the present application with a stirring support;

[0039] Figure 4 is a structural schematic diagram of an embodiment of the present application with another stirring support;

[0040] Figure 5 is a structural schematic diagram of an embodiment of the present application with heat dissipation fins on the exposed part of the stirring shaft;

[0041] Figure 6 is a structural schematic diagram of an embodiment of the present application with cooling coils on the exposed part of the stirring shaft.

[0042] BRIEF DESCRIPTION OF THE DRAWINGS

[0043] tank 1, stirring shaft 2, driving motor 3, driving end 4, driven end 5, helical blade 6, transmission gear set 7, driving gear 8, driven gear 9, motor fixing support 10, connecting shaft 11, bearing fixing support 12, stirring support 13, cross bar 14, vertical bar 15, heat dissipation fin 16, cooling coil 17, fixed bearing 18. DETAILED DESCRIPTION

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the specific embodiments of the present application will be described below with reference to the drawings. Obviously, the drawings in the following description only represent some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without creative labor, and other embodiments can also be obtained.

[0045] In order to make the drawing simple, only the parts related to the present application are shown in each drawing, which does not represent the actual structure of the product. In addition, in order to make the drawing simple and easy to understand, in some drawings, only one of the parts with the same structure or function is shown, or only one of them is marked. In this paper, "one" not only means "only one", but also means "more than one".

[0046] It should be further understood that the term "and / or" used in the present application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0047] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0048] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0049] refer to Figures 1-6 This application provides a magnetically stirred molten salt thermal storage heat exchange device, comprising: a tank 1, with heat exchange pipes (not shown) on the tank wall, and the tank 1 being suitable for filling with molten salt thermal storage material; a heating device (not shown) inserted vertically into the molten salt thermal storage material in the tank 1, the heating device being used to heat the molten salt thermal storage material; and a stirring shaft 2, which is rotatably inserted vertically into the molten salt thermal storage material from the top of the tank 1, the portion of the stirring shaft 2 located inside the tank 1 being provided with a screw... The spiral blades 6 and the upper end of the stirring shaft 2 are exposed outside the tank body 1; the drive motor 3 is installed on the top of the tank body 1; the magnetic coupling includes a driving end 4 and a driven end 5, the driving end 4 and the driven end 5 are connected in a non-contact manner, the driving end 4 can drive the driven end 5 to rotate when it rotates, the driving end 4 is connected to the drive motor 3, and the driven end 5 is coaxially fixed to the upper end of the stirring shaft 2; through the magnetic coupling, the drive motor 3 can drive the stirring shaft 2 to rotate so that the spiral blades 6 can stir the molten salt thermal storage material.

[0050] It can be understood that, by inserting the stirring shaft 2 into the tank body 1 from the tank top and driving the upper end of the stirring shaft 2 by the driving motor 3, the whole stirring shaft 2 is driven to rotate, which avoids opening a hole in the bottom of the tank body 1 and reduces the risk of leakage of the tank body 1. In addition, the driving assembly is arranged on the tank top, which does not change the original stress distribution form of the bottom of the tank body 1 (the bottom of the tank body 1 is placed on a horizontal bearing base surface), and the bottom of the tank body 1 is still uniformly stressed. On the other hand, through the magnetic coupling transmission, the non-contact transmission between the output end of the driving motor 3 and the stirring shaft 2 is realized, so that the heat of the stirring shaft 2 cannot be directly transmitted to the driving motor 3 and the related components directly connected (contact connection) with the driving motor 3 in the form of heat conduction, reducing the risk of damage of the driving motor 3 and the related components due to high temperature. In the present application, the driving end 4 and the driven end 5 of the magnetic coupling are both located outside the tank body 1, reducing the risk of damage of the driven end 5 due to high temperature. In the present application, by providing the helical blade 6 on the stirring shaft 2, the stirring effect of the molten salt in the tank is improved, so that the molten salt at different heights in the tank can be fully mixed, the consistency of the molten salt temperature in the tank 1 in the height direction is improved, and the utilization rate of the heat storage and heat release capacity of the molten salt is improved.

[0051] Reference Figure 1 , Figures 3-6 In one embodiment, the molten salt heat storage and heat exchange device further comprises a transmission gear set 7, and the driving motor 3 drives the driving end 4 to rotate through the transmission gear set 7. It is easy to understand that, by providing the transmission gear set 7, the driving motor 3 and the driving end 4 transmit power through the transmission gear set 7, so that the driving motor 3 can be flexibly arranged, reducing the requirement of space for arranging the driving motor 3.

[0052] Reference Figure 1 , Figures 3-6 In a specific embodiment, the transmission gear set 7 comprises a driving gear 8 and a driven gear 9 which are engaged with each other, and the axis of the driving gear 8 and the axis of the driven gear 9 are perpendicular to each other; the driving motor 3 is fixed horizontally on the tank top of the tank body 1 through a motor fixing support 10, the driving gear 8 is installed on the output end of the driving motor 3; the driven gear 9 and the driving end 4 are respectively installed on both ends of a connecting shaft 11, and the connecting shaft 11 is rotatably fixed on the tank top of the tank body 1 through a bearing fixing support 12. This embodiment can reduce the height of the whole molten salt heat storage and heat exchange device after the driving motor 3 is installed, and can save height space. Specifically, the connecting shaft 11 is provided with a fixed bearing 18, and the fixed bearing 18 is fixed through the bearing fixing support 12.

[0053] In another embodiment (not shown), the driving motor 3 is fixed vertically on the tank top of the tank body 1 by the motor fixing support 10 and located beside the magnetic coupling axis. It can be understood that, by arranging the driving motor 3 vertically and locating the driving motor 3 beside the magnetic coupling axis, compared with the technical solution that the output end of the driving motor 3 is directly connected with the driving end 4 of the magnetic coupling, the height of the whole molten salt heat storage and heat exchange device after installation of the driving motor 3 can be reduced, and the height space is saved.

[0054] Different from the technical solution that the driving is realized through the transmission gear set 7, referring to Figure 2 In one embodiment, the driving motor 3 is fixed vertically on the tank top of the tank body 1 by the motor fixing support 10, and the output end of the driving motor 3 is directly connected with the driving end 4 of the magnetic coupling. It is worth noting that, by directly connecting the output end of the driving motor 3 with the driving end 4 of the magnetic coupling, compared with the technical solution that the driving motor 3 is driven through the transmission gear set 7 between the driving motor 3 and the driving end 4, the driving efficiency of the driving motor 3 can be ensured.

[0055] Referring to Figures 1-6 In one embodiment, the part of the stirring shaft 2 exposed to the tank body 1 is sleeved with the fixed bearing 18, and the fixed bearing 18 is fixed on the tank top of the tank body 1 by the bearing fixing support 12. The fixed bearing 18 is located outside the tank body 1, which can reduce the risk of damage of the fixed bearing 18 due to high temperature in the tank. Preferably, the fixed bearing 18 is at least two, and the plurality of fixed bearings 18 are arranged at intervals. By sleeving the part of the stirring shaft 2 exposed to the tank body 1 with at least two fixed bearings 18 arranged at intervals, the degree of wear of the fixed bearing 18 when the stirring shaft 2 rotates can be reduced, and the stability of the stirring shaft 2 when rotating can be improved.

[0056] Referring to Figures 2-6 In one embodiment, the part of the stirring shaft 2 located in the tank body 1 is provided with the stirring support 13, and the stirring support 13 has a radial dimension along the tank body 1 greater than the helical blade 6.

[0057] It is worth noting that, by arranging the stirring support 13, on the one hand, the stirring and mixing effect of the molten salt can be improved, the consistency of the molten salt temperature in the height direction and the radial direction of the tank body 1 can be improved, and the utilization rate of the molten salt heat storage and heat release capacity can be improved, and on the other hand, the stirring support 13 can play a role in heat transfer, the temperature of the molten salt in the tank body 1 can be balanced, and the consistency of the molten salt temperature in the height direction and the radial direction of the tank body 1 can be further ensured.

[0058] In one embodiment, referring to Figure 3, the stirring support 13 comprises at least two horizontal rods 14 and at least two vertical rods 15, the horizontal rods 14 are perpendicular to the stirring shaft 2, the vertical rods 15 are parallel to the stirring shaft 2, the horizontal rods 14 and the vertical rods 15 are connected to form a rectangular stirring support 13. Such a stirring support 13 is more suitable for a cylindrical tank 1. In another specific embodiment, referring to Figure 4 , Figure 4 the stirring support 13 in the type of

[0059] Referring to Figure 5 , in an embodiment, the part of the stirring shaft 2 exposed to the tank 1 is provided with heat dissipation fins 16. By providing heat dissipation fins 16 on the part of the stirring shaft 2 exposed to the tank 1, heat dissipation is performed on the exposed part of the stirring shaft 2, which reduces the risk of damage to components in direct contact with the stirring shaft 2 due to high temperature.

[0060] Referring to Figure 6 , in an embodiment, the molten salt heat storage and heat exchange device further comprises a cooling coil 17, which is provided in a spiral around the part of the stirring shaft 2 exposed to the tank 1; by passing cooling water in the cooling coil 17, the part of the stirring shaft 2 exposed to the tank 1 is cooled; the cooling water heated by the cooling coil 17 is finally passed into the heat exchange pipe.

[0061] It is worth noting that by providing a cooling coil 17 on the exposed part of the stirring shaft 2, on the one hand, it reduces the temperature of the exposed part of the stirring shaft 2, which reduces the risk of damage to components in direct contact with the stirring shaft 2 due to high temperature, on the other hand, it can recycle the heat transferred to the stirring shaft 2 by the high-temperature molten salt in the tank 1, reduce energy waste, and improve energy efficiency.

[0062] It should be noted that the above embodiments can be freely combined as needed. The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which improvements and refinements should be considered as the protection scope of the present application.

Claims

1. A magnetically stirred molten salt thermal energy storage and heat exchange device, characterized by, The application relates to a molten salt heat storage device. The device comprises: a tank body, a heat exchange pipeline being arranged on the tank wall of the tank body, and the tank body being suitable for filling molten salt heat storage material; a heating device, which is inserted into the molten salt heat storage material in the tank body in a vertical direction, and is used for heating the molten salt heat storage material; a stirring shaft, which is rotatably inserted into the molten salt heat storage material in a vertical direction from the tank top of the tank body, and the part of the stirring shaft in the tank body is provided with spiral blades, and the upper end of the stirring shaft is exposed to the tank body; a driving motor, which is arranged on the tank top of the tank body; a magnetic coupling, which comprises a driving end and a driven end, the driving end and the driven end are non-contact connection, the driving end can drive the driven end to rotate when the driving end rotates, the driving end is connected to the driving motor, and the driven end is coaxially fixed to the upper end of the stirring shaft; 2. The molten salt heat storage and heat exchange device of claim 1, wherein, the driving motor can drive the stirring shaft to rotate through the magnetic coupling, so that the spiral blades stir the molten salt heat storage material.

3. The molten salt heat storage and heat exchange device of claim 2, wherein, The device further comprises a transmission gear set, the driving motor drives the driving end to rotate through the transmission gear set.

4. The molten salt heat storage and heat exchange device of claim 2, wherein, The transmission gear set comprises driving gears and driven gears which are in mesh with each other, the axes of the driving gears and the axes of the driven gears are perpendicular to each other; the driving motor is fixed on the tank top of the tank body in a horizontal type through a motor fixing support, the driving gears are installed on the output end of the driving motor; the driven gears and the driving end are respectively installed on two ends of a connecting shaft, and the connecting shaft is rotatably fixed on the tank top of the tank body through a bearing fixing support.

5. The molten salt heat storage and heat exchange device of claim 1, wherein, The driving motor is fixed on the tank top of the tank body in a vertical type through a motor fixing support and is located on one side of the axis of the magnetic coupling.

6. The molten salt heat storage and heat exchange device of claim 1, wherein, The driving motor is fixed on the tank top of the tank body in a vertical type through a motor fixing support, and the output end of the driving motor is directly connected with the driving end of the magnetic coupling.

7. A molten salt thermal storage and heat exchange device with magnetic stirring according to any of claims 1-6, characterized in that, The part of the stirring shaft exposed to the tank body is sleeved with a fixed bearing, and the fixed bearing is fixed on the tank top of the tank body through a bearing fixing support.

8. The molten salt heat storage and heat exchange device of claim 7, wherein, The part of the stirring shaft in the tank body is provided with a stirring support, and the stirring support is larger than the spiral blades in the radial direction of the tank body.

9. A molten salt thermal storage and heat exchange device with magnetic stirring according to any one of claims 1-6, characterized in that, The stirring support comprises at least two horizontal rods and at least two vertical rods, the horizontal rods are perpendicular to the stirring shaft, the vertical rods are parallel to the stirring shaft, and the horizontal rods and the vertical rods are connected to form the stirring support in a rectangular shape.

10. A molten salt thermal storage and heat exchange device with magnetic stirring according to any one of claims 1-6, characterized in that, The part of the stirring shaft exposed to the tank body is provided with heat dissipation fins. The device further comprises cooling coils, which are arranged in a spiral shape around the part of the stirring shaft exposed to the tank body; cooling water is passed through the cooling coils to cool the part of the stirring shaft exposed to the tank body; and the cooling water heated through the cooling coils is finally passed into the heat exchange pipeline.

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