Molten salt trough-type heat collecting device

Abstract

Disclosed in the present application is a molten salt trough-type heat collecting device, comprising a heat collector for tracking the rotation of the sun and a connecting assembly; the heat collector comprises a heat collecting tube for collecting heat; the connecting assembly comprises a metal hose, a first connecting tube, and a second connecting tube for connecting one end of the metal hose to a fixed pipe; and the other end of the metal hose is in communication with an end portion of the heat collecting tube by means of the first connecting tube. The present application can simplify the overall structure of the device, reduce the number of potential leakage points, and reduce the risk of leakage.

Description

Molten salt tank type solar collector Technical Field

[0001] This application relates to the field of solar collector technology, and in particular to a molten salt trough type solar collector. Background Technology

[0002] The connecting assembly of a molten salt trough solar collector is the connection structure between the trough collector and the heat transfer medium header. It connects the dynamically rotating trough collector to the stationary heat transfer medium header. The structure of this connecting assembly must allow the connected collector to rotate while tracking the sun, maintain a stable connection with the stationary heat transfer medium header, and ensure smooth flow of the molten salt medium between them. Therefore, this connecting assembly is positioned between the rotating collector and the stationary heat transfer medium, and it must compensate for the relative displacement caused by changes in the positional relationship between the collector and the stationary heat transfer medium header during the collector's rotation while tracking the sun.

[0003] Meanwhile, molten salt trough solar collectors operate at high temperatures (up to 550 ℃ or higher), resulting in a significant temperature difference between the equipment's operation and shutdown states. This causes the collector to experience thermal expansion. Therefore, the connection assembly must be designed to absorb the collector's expansion displacement to ensure stable connection with the fixed heat transfer medium header.

[0004] Currently, trough-type solar collectors that use heat transfer oil as the heat transfer medium require at least three spherical rotary joints connected in series with rigid connecting pipe sections to form a connection assembly, in order to simultaneously achieve the aforementioned multiple functions. However, this connection method results in a large number of connecting components and a complex overall structure, leading to more potential leakage points and thus a significant leakage risk. Summary of the Invention

[0005] The technical problem to be solved by this application is to provide a molten salt tank type heat collection device.

[0006] The technical solution adopted by the embodiments of this application to solve its technical problem is:

[0007] Constructing a molten salt tank type solar collector includes:

[0008] A solar collector that tracks the rotation of the sun, the solar collector comprising collecting tubes for collecting heat;

[0009] The connecting assembly includes a metal flexible hose, a first connecting pipe, and a second connecting pipe that connects one end of the metal flexible hose to a fixed pipe; the other end of the metal flexible hose is connected to the end of the heat collection pipe through the first connecting pipe.

[0010] In some embodiments, the first connecting pipe is bent or curved, with a first end connected to the heat collection pipe and a second end bent or curved toward the fixed pipe, and the port of the second end is perpendicular to the extension direction of the heat collection pipe; when the angle of the heat collector is 90°, the port of the second end is oriented toward the direction of gravity.

[0011] In some embodiments, the end of the second connecting pipe connected to the metal flexible hose is horizontally spaced at the end of the heat collection tube, and its port faces a direction parallel to the extension direction of the heat collection tube.

[0012] In some embodiments, the end of the second connecting pipe connected to the metal flexible hose is horizontally spaced on one side of the heat collection tube, and the port faces horizontally and perpendicular to the extension direction of the heat collection tube.

[0013] In some embodiments, when the working angle of the solar collector is set to -20° to 120°, the fixed pipe and the connecting assembly are arranged in the horizontal direction on the side of the solar collector facing at 120°, or the fixed pipe and the connecting assembly are arranged in the horizontal direction at the end of the solar collector.

[0014] When the working angle of the solar collector is set to 0° to 180°, the fixed pipe and the connecting assembly are arranged horizontally at the end of the solar collector.

[0015] In some embodiments, the metal hose, the first connecting tube, and the second connecting tube are made of 321 stainless steel.

[0016] In some embodiments, the metal hose is a metal corrugated pipe, and the first connecting pipe and the second connecting pipe are metal rigid pipes.

[0017] In some embodiments, the corrugated height of the metal hose is greater than or equal to 8 mm and less than or equal to 15 mm;

[0018] And / or, the wave pitch of the metal hose is greater than or equal to 5 mm and less than or equal to 15 mm.

[0019] In some embodiments, the wall thickness of the metal flexible hose is greater than or equal to 0.6 mm and less than or equal to 1.5 mm.

[0020] In some embodiments, the length of the metal hose is greater than or equal to 5m and less than or equal to 10m;

[0021] And / or, the bending radius of the metal hose is greater than or equal to 800 mm and less than or equal to 1500 mm.

[0022] In some embodiments, the connecting assembly further includes at least one support base; the second connecting pipe is disposed on the at least one support base; or, the end of the second connecting pipe and the fixed pipe connected to the second connecting pipe is disposed on the at least one support base.

[0023] Implementing this application has at least the following beneficial effects:

[0024] This application, by incorporating a flexible metal hose, utilizes the inherent flexibility of the material to compensate for the relative displacement caused by changes in the positional relationship between the collector tube and the fixed heat transfer medium tube during rotation. This absorbs the torsion resulting from positional changes during rotation of both the fixed pipe and the collector tube, thus preventing stress concentration. Furthermore, the flexible metal hose itself absorbs the expansion displacement of the collector tube due to temperature changes. The connection assembly in this application requires only one flexible metal hose and two connecting pipes, simplifying the overall structure of the device, reducing the number of potential leak points, and lowering the risk of leakage. Attached Figure Description

[0025] The present application will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0026] Figure 1 is a schematic diagram of the structure of a molten salt tank type heat collection device according to an embodiment of this application;

[0027] Figure 2 is a schematic diagram of the solar collector shown in Figure 1. Detailed Implementation

[0028] To provide a clearer understanding of the technical features, objectives, and effects of this application, the specific embodiments of this application are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or component referred to must have a specific orientation; therefore, they should not be construed as limitations on this application.

[0029] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, that component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0030] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0031] Figure 1 shows a molten salt tank type heat collection device 1 in one embodiment of this application, which can collect solar thermal energy and reduce the heat transferred to the internal heat transfer medium to achieve heat collection.

[0032] The molten salt tank type solar collector 1 may include a collector 10 and a connecting assembly 20. The collector 10 can rotate synchronously with the changing position of the sun to collect as much heat as possible during sunlight exposure. The connecting assembly 20 is connected to both the fixed pipe 2 and the collector 10 to form a medium transmission channel for transmitting the heat transfer medium. The collector 10 can conduct the collected heat into the heat transfer medium, which is then transmitted through the connecting assembly 20 and the fixed pipe 2, and finally to the heat-using equipment for use of the collected heat.

[0033] Referring to Figure 2, the solar collector 10 may include a rotating shaft 15 and a heat collection tube 11. The heat collection tube 11 is hollow and allows for the flow of a heat transfer medium. The heat collected by the solar collector 10 can be conducted into the heat transfer medium inside the heat collection tube 11. The rotating shaft 15 is parallel to and spaced apart from the heat collection tube 11, and is used to rotate in accordance with the changing position of the sun, thereby causing the entire solar collector 10 to rotate in accordance with the changing position of the sun. The heat collection tube 11 can rotate about the rotating shaft 15 as its axis.

[0034] The connecting assembly 20 may include a flexible metal hose 21, a first connecting pipe 22, and a second connecting pipe 23. The flexible metal hose 21 is a soft tubular structure, with one end connected to the first connecting pipe 22 and the other end connected to the second connecting pipe 23, forming a medium transmission pipe. This allows the heat transfer medium to absorb heat within the heat collector pipe 11 and then flow within the medium transmission pipe to transfer the heat to the heat-using equipment for use. The first connecting pipe 22 is disposed between the flexible metal hose 21 and the heat collector pipe 11, and the flexible metal hose 21 is connected to the heat collector pipe 11 through the first connecting pipe 22. The second connecting pipe 23 is disposed between the flexible metal hose 21 and the fixed pipe 2, and the flexible metal hose 21 is connected to the fixed pipe 2 through the second connecting pipe 23.

[0035] It is important to understand that during the commissioning of the molten salt tank-type solar collector 1, the collector tube 11 will rotate back and forth around the axis 15, at least partially along its circumferential angle, while the fixed pipe 2 cannot rotate. Therefore, the relative position of the collector tube 11 and the fixed pipe 2 around the axis 15 will change during this rotation. At this time, the connection structure between the fixed pipe 2 and the collector tube 11 will rotate with the collector tube 11 at one end, while the other end remains fixed to the fixed pipe 2, resulting in torsion. If a rigid pipe exists in this connection structure, torsional stress concentration may occur at the connection point, leading to leakage. If multiple rotary joints are used in the connection structure to prevent torsional stress, the presence of these joints also creates leakage points, posing a potential leakage risk.

[0036] This application, by incorporating a flexible metal hose 21, utilizes the material properties of its flexible connection to absorb the torsion generated by the rotation of the heat collector tube 11 relative to the fixed pipe 2, thus achieving a stable connection between the two. In other words, the flexible metal hose 21 prevents stress concentration.

[0037] Furthermore, the flexible metal hose 21 can absorb the expansion displacement of the heat collector tube 11 caused by temperature changes through its own flexible structural properties. For example, when the heat collector tube 11 changes from a stopped state to an operational state, its axial length may expand due to the increase in temperature. Since the positional relationship between the fixed pipe 2 and the end of the heat collector tube 11 is relatively fixed, the distance from the end of the heat collector tube 11 to the end of the fixed pipe 2 changes after the heat collector tube 11 undergoes thermal expansion. The flexible metal hose 21 can absorb this expansion through its own flexible deformation (such as increasing the curvature), while also ensuring the smooth conduction of the medium transmission pipeline.

[0038] This application, by setting up a connecting assembly 20, requires only a metal flexible hose 21 and two pipes for connection (first connecting pipe 22 and second connecting pipe 23). This allows for the absorption of thermal expansion and compensation for relative displacement caused by changes in the positional relationship between the heat collection tube 11 and the fixed pipe 2, while also ensuring smooth conduction of the medium transmission pipeline. This structural design reduces the number of components in the connecting assembly and simplifies the overall structure of the device.

[0039] The connection component 20 also prevents the fixed pipe 2, connection component 20, and heat collection pipe 11 from being subjected to torsional stress, bending stress, and other stresses. It also ensures that the connections between them are not affected by stress concentration, providing a stable connection and improving the structural stability of the device, thus guaranteeing stable operation. Reducing the number of components also effectively reduces the number of connection points between components, thereby reducing the number of potential leakage points and lowering the risk of leakage.

[0040] It is important to understand that the current connection structure requires the use of multiple rotary joints and multiple rigid pipes to compensate for the relative displacement between the fixed pipe 2 and the heat collection pipe 11 while achieving connectivity between the two. However, leaks are prone to occur at the locations of the rotary joints, therefore the number of various rotary joints will correspondingly affect the number of potential leak points.

[0041] This application achieves the desired effect by setting up a metal hose 21, eliminating the need for a rotary joint, thereby further reducing the number of potential leakage points.

[0042] It should be understood that the number of the connecting components 20 can be set to two, respectively located at opposite ends of the collector 10.

[0043] As shown in Figure 1, the solar collector 10 may further include a reflector 12, a bracket 13, a connecting frame 14, and at least two support frames 16. The bracket 13 is longitudinally elongated, and the rotating shaft 15 and the reflector 12 are respectively mounted on the bracket 13. The reflector 12 has a longitudinally elongated arc-shaped plate structure, with a circular arc-shaped cross-section perpendicular to its length. The connecting frame 14 is erected perpendicular to the extension direction of the bracket 13 and is used to support the heat collection tube 11. The heat collection tube 11, supported by the connecting frame 14, is arranged parallel to and spaced apart on the concave side of the arc-shaped reflector 12. The concave side of the reflector 12 can reflect sunlight to the heat collection tube 11, thereby achieving heat collection. The at least two support frames 16 are spaced apart and respectively support the rotating shaft 15 at two different positions to provide overall support for the solar collector 10.

[0044] It should be understood that the axes of the reflector 12, the support 13, the heat collection tube 11, and the rotating shaft 15 are arranged in parallel intervals, and the direction of the parallel intervals is roughly along the direction of gravity. The rotating shaft 15 can drive the support 13 to rotate synchronously with the sun, thereby driving the reflector 12 set on the support 13 to rotate synchronously, and at the same time, it can also drive the heat collection tube 11 to rotate synchronously through the connecting frame 14.

[0045] It should be understood that the rotating shaft 15 can be a single-section rod structure, that is, a single shaft extending along the length of the bracket 13. Alternatively, as shown in Figure 1, it can be a two-section structure, that is, two coaxially extending shafts. The two shafts can be coaxially positioned on opposite sides of the bracket 13, in which case two support frames 16 can be correspondingly provided, each supporting one shaft segment. No specific limitations are made here.

[0046] During operation, the reflector 12 of the solar collector 10 is always positioned so that its concave side faces the sun directly, driven by the rotating shaft 15. The rotation angle of the solar collector 10 can also be adjusted according to the sun's path at different times.

[0047] For example, as shown in Figure 2, if the solar collector 10 is arranged in a north-south configuration, its axial direction (the extension direction of the solar collector tube 11) extends in the north-south direction. The solar collector 10 can follow the sun's rise and set, collecting heat by tracking the sun's rotation from east to west. During the tracking process, the tracking angle of the solar collector 10 can be controlled and adjusted. Generally, the two angles where the opening of the curved surface of its reflector 12 faces horizontally are defined as 0° and 180°. Further, the horizontal angle of the opening of the curved surface of the reflector 12 facing east is generally defined as 0°, the horizontal angle facing west is defined as 180°, and the vertical angle facing the sky is defined as 90°. During the sun's rise and set, the solar collector 10 can track the sun's rotation from 0° to 180°.

[0048] It should be understood that the operating angle of the solar collector 10 can be within a smaller range between 0° and 180°, such as 45° to 180°, -20° to 120°, etc. However, the size of its operating angle is not considered a limitation on the range of angles that the solar collector 10 can rotate. The range of rotation angles of the solar collector 10 can be larger than its operating angle range, for example, its rotation angle range can be -15° to 180°, 0° to 195°, etc., and no specific limitation is made here.

[0049] It should be understood that the existing solar collectors 10 also have east-west arrangement patterns, which will not be specifically limited here.

[0050] It should be understood that the solar collector 10 can use existing technology, which will not be further explained here.

[0051] As shown in Figure 1, in some embodiments, the first connecting pipe 22 may be bent or folded to change the transmission direction of the medium transmission channel. The first connecting pipe 22 has a first end and a second end, wherein the first end is connected to the end of the heat collection pipe 11, and the second end is bent or folded towards the fixed pipe 2 and is connected to the metal flexible hose 21.

[0052] The first end port is oriented horizontally. The second end port is oriented perpendicular to the extension direction of the collector tube 11. When the angle of the collector 10 is 90°, the second end port is oriented in the direction of gravity (i.e., downwards).

[0053] It is important to understand that, since the metal flexible hose 21 is a flexible tube, it will deform downwards under the influence of gravity. If the first connecting pipe 22 is not provided, such deformation will cause additional stress at the connection between the metal flexible hose 21 and the heat collection pipe 11, which is detrimental to the structural stability of the pipeline.

[0054] By setting the first connecting pipe 22, the metal hose 21 can be connected to the first connecting pipe 22 at a position that extends along the direction of gravity, avoiding the generation of bending stress and thus improving structural stability.

[0055] In some embodiments, the connecting component 20 and the fixed pipe 2 can be disposed at the end of the collector 10 along its length or on one side along its length, so that the layout of the device can be flexibly adjusted according to different situations, while meeting the aforementioned functional requirements of the connecting component 20, thereby improving the space utilization of the device.

[0056] For example, when the rotation angle of the collector 10 is set between -20° and 120°, the fixed pipe 2 and the connecting assembly 20 can be arranged horizontally on the side of the collector 10 facing at 120°, or they can be arranged horizontally at the end of the collector 10. When the rotation angle of the collector 10 is set between 0° and 180°, the fixed pipe 2 and the connecting assembly 20 are arranged horizontally at the end of the collector 10.

[0057] It should be understood that the fixed pipe 2 and the connecting component 20 are arranged horizontally at the end or one side of the collector 10, which will cause a significant change in the positional relationship between the fixed pipe 2 and the connecting component 20 and the collector 10, and thus cause a change in the direction of the external force on the connecting component 20.

[0058] The structural configuration of the first connecting pipe 22 and the second connecting pipe 23, or the angle configuration of the two ends of the second connecting pipe 23, can be adaptively adjusted according to the changes in the positional relationship between the fixed pipe 2 and the connecting component 20 and the collector 10, so as to reduce the stress on the metal hose 21.

[0059] The structural configurations of the first connecting pipe 22 and the second connecting pipe 23 will be further explained below through two specific position settings.

[0060] As shown in Figure 1, in the embodiment shown, the fixed pipe 2 and the connecting assembly 20 are located at one end of the collector 10 in the horizontal direction.

[0061] In the embodiment shown in Figure 1, the end of the second connecting pipe 23 that connects to the metal flexible hose 21 is horizontally spaced at the end of the heat collection pipe 11 and lies on the same plane as the heat collection pipe 11. In other directions besides the axial direction of the heat collection pipe 11, the two are spaced apart only in the height direction. The orientation of the port of the second connecting pipe 23 that connects to the metal flexible hose 21 is parallel to the extension direction of the heat collection pipe 11.

[0062] It is important to understand that, due to the horizontal distance between the end of the second connecting pipe 23 and the end of the heat collection pipe 11, the end of the metal hose 21 connected to the second connecting pipe 23 will be subjected to an upward-sloping force during the connection process. The resultant force of this force and gravity can extend approximately horizontally. Setting the orientation of the port where the second connecting pipe 23 connects to the metal hose 21 to extend horizontally can more closely approximate the direction of the resultant force on the metal hose 21 at that end, thereby reducing stress generation and further improving the stability of the structure.

[0063] In the embodiment shown in Figure 1, the second connecting pipe 23 has a straight tubular structure. The end of the fixed pipe 2 that connects to the second connecting pipe 23 is coaxially arranged with the second connecting pipe 23. The first connecting pipe 22 is approximately a bent pipe with a 90° bend, and it may include a horizontal side and a vertical side. One end of the horizontal side is connected to the heat collection pipe 11, and the other end is closed. The end of its vertical side is connected to the flexible metal hose 21.

[0064] In some other alternative embodiments, when the fixed pipe 2 is located on one side of the extension direction of the heat collection pipe 11 in the horizontal direction, the orientation of the end of the second connecting pipe 23 connected to the fixed pipe 2 can be adaptively adjusted. For example, the second connecting pipe 23 can be arranged in a Z-shape, a 90° bend, an irregular bend, etc., with one end connected to the metal flexible hose 21 and the other end connected to the fixed pipe 2.

[0065] In some other alternative embodiments, the first connecting pipe 22 may also be in the form of an inverted L-shape, a quarter-circle arc structure, etc.

[0066] When the fixed pipe 2 and the connecting assembly 20 are located on one side of the collector 10 in the horizontal direction (not shown in this embodiment), the end of the second connecting pipe 23 that connects to the metal hose 21 is located on one side of the extending direction of the collector pipe 11 in the horizontal direction. The port of the end of the second connecting pipe 23 that connects to the metal hose 21 is oriented in the horizontal direction and perpendicular to the extending direction of the collector pipe 11.

[0067] The orientation of the end of the second connecting pipe 23 that connects to the metal hose 21 can also make it closer to the direction of the resultant force on the metal hose 21 at that end, thereby reducing stress generation and further improving the stability of the structure.

[0068] In various embodiments of this layout, the extension direction of the end where the fixed pipe 2 connects to the second connecting pipe 23 can be selected in several ways. For example, its extension direction can be set to be perpendicular to the extension direction of the heat collection pipe 11, or it can be set to be parallel to the extension direction of the heat collection pipe 11, etc.

[0069] When the end of the fixed pipe 2 connected to the second connecting pipe 23 extends horizontally and is set perpendicular to the heat collection pipe 11, the second connecting pipe 23 can be set as a straight tubular structure and set coaxially with the end of the fixed pipe 2.

[0070] When the end of the fixed pipe 2 that connects to the second connecting pipe 23 extends horizontally and is parallel to the heat collection pipe 11, the second connecting pipe 23 can be configured as a curved or bent tubular structure to facilitate changing the orientation of its two ends. One end is perpendicular to the heat collection pipe 11 and is used to connect to the metal flexible hose 21. The other end is parallel to the heat collection pipe 11 and is used to connect to the fixed pipe 2. Specifically, in this embodiment, the second connecting pipe 23 can be configured as L-shaped, T-shaped, arc-shaped, Z-shaped, etc., without specific limitations.

[0071] It should be understood that although the port orientation of the first connecting pipe 22 is still towards the direction of gravity when the angle of the collector 10 is 90°, its overall structure can be adaptively adjusted according to the positional relationship between the fixed pipe 2 and the collector pipe 11.

[0072] For example, the first connecting pipe 23 may include a horizontal pipe section and a vertical pipe section. The vertical pipe section is located at one end of the horizontal pipe section, with its vertical end opening downwards for connection to the metal flexible hose 21. The horizontal pipe section may be curved or bent to facilitate proximity to the fixed pipe 2 located on one side of the heat collection pipe 11. Specifically, the horizontal pipe section may be C-shaped, U-shaped, Z-shaped, etc., without specific limitations.

[0073] In some embodiments, the installation height of the fixed pipe 2 is generally lower than the installation height of the heat collection pipe 11. Therefore, under the structural cooperation of the first connecting pipe 22 and the second connecting pipe 23, the metal flexible hose 21 generally forms a downwardly concave quarter-circle arc structure under the action of gravity within at least a part of the working angle range.

[0074] In some embodiments, the metal hose 21 is a metal corrugated pipe, and the first connecting pipe 22 and the second connecting pipe 23 are metal rigid pipes.

[0075] By setting the first connecting pipe 22 and the second connecting pipe 23 as rigid structures, the stability of their connection with the heat collection pipe 11 and the fixed pipe 2 can be improved, and the heat collection pipe 11 and the fixed pipe 2 can be prevented from being subjected to large stress.

[0076] By designing the metal hose 21 as a corrugated pipe, its excellent flexibility can be utilized to adapt to the bending requirements of the metal hose 21 during the solar collector 10's tracking of the sun's rotation, reducing the need for connecting fittings (first connecting pipe 22, second connecting pipe 23) and lowering installation difficulty and cost. The corrugated pipe also possesses high torsional stiffness characteristics; after torsional buckling, it can still withstand increased torque within a certain range, ensuring good structural rigidity even under large torsional loads and preventing leakage.

[0077] The corrugated pipe can be configured to match the port orientation of the first connecting pipe 22 and the second connecting pipe 23, thereby further improving the stable connection under various connection position changes during the process of the solar collector tube 11 tracking the rotation of the sun and avoiding leakage problems.

[0078] In some embodiments, the wave height of the metal flexible hose 21 is greater than or equal to 8 mm and less than or equal to 15 mm. For example, it can be selected as 8.5 mm, 9 mm, 9.5 mm, 10 mm, 10.5 mm, 11 mm, 11.5 mm, 12 mm, 12.5 mm, 13 mm, 13.5 mm, 14 mm, 14.5 mm, or any other value within this range.

[0079] In some embodiments, the wave pitch of the metal flexible hose 21 can be greater than or equal to 5 mm and less than or equal to 15 mm. For example, it can be selected as 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, or any other value within this range.

[0080] In some embodiments, a protective sleeve may be fitted over the metal hose 21 to further improve the structural performance of the metal hose 21, and at the same time, it can also play a certain role in heat preservation and reduce heat loss.

[0081] In some embodiments, the connecting component 20 may be made of 321 stainless steel or a material with superior properties. The 321 stainless steel also has good high-temperature resistance and high-temperature corrosion resistance to meet working environments with temperatures greater than or equal to 550°C and pressures greater than or equal to 4 MPa. Simultaneously, it also possesses high mechanical properties, creep resistance, and stress fracture resistance, as well as high tensile strength, yield strength, elongation, and hardness.

[0082] In some embodiments, the connection between the fixed pipe 2, the first connecting pipe 22, the metal hose 21, the second connecting pipe 23, and the heat collection pipe 11 can be achieved by welding to avoid the risk of leakage at the connection point, thereby further reducing the number of potential leakage points in the overall device.

[0083] In some embodiments, the wall thickness of the metal hose 21 is greater than or equal to 0.6 mm and less than or equal to 1.5 mm to meet both temperature and internal pressure requirements. For example, it can be set to 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, or any other value within this range.

[0084] In some embodiments, the bending radius of the metal flexible hose 21 can be greater than or equal to 800 mm and less than or equal to 1500 mm. For example, it can be set to 850 mm, 900 mm, 950 mm, 1000 mm, 1050 mm, 1100 mm, 1150 mm, 1200 mm, 1250 mm, 1300 mm, 1350 mm, 1400 mm, 1450 mm, or any other value within this range.

[0085] In some embodiments, the length of the metal flexible hose 21 can be greater than or equal to 5m and less than or equal to 10m. For example, it can be set to 5.5m, 6m, 6.5m, 7m, 7.5m, 8m, 8.5m, 9m, 9.5m, or any other value within this range.

[0086] It should be understood that by adjusting the bending radius and / or length of the metal hose 21, and in conjunction with the dimensions of other components such as the solar collector 10, the curvature of the metal hose 21 can be adjusted to reduce stress and further reduce the risk of leakage.

[0087] Furthermore, the collector tube 11 expands during both its operational and shutdown states. The expansion compensation requirement can be met by adjusting the bending radius and / or length of the flexible metal hose 21. Its length and / or bending radius must ensure that the compensable expansion is not less than 1200 mm.

[0088] As shown in Figure 1, in some embodiments, the connecting component 20 may further include a support base 24. The second connecting pipe 23 is disposed on the support base 24 to support the connecting component 20.

[0089] It should be understood that the second connecting pipe 23 can be fixed to the support base 24 by a connecting structure, which can be bolts, clamps, connecting ropes, etc., and no specific limitation is made here.

[0090] In some other alternative embodiments, the ends of the second connecting pipe 23 and the fixed pipe 2 connected to the second connecting pipe 23 can both be disposed on the support base 24. Alternatively, at least two support bases 24 can be disposed to support the second connecting pipe 23 and the fixed pipe 2 respectively.

[0091] In the embodiment shown in Figure 1, the support base 24 is in the form of a rectangular support block. In some other alternative embodiments, the support base 24 may also be in the form of a bracket to increase the support height for the fixed pipe 2 and the connecting assembly 20.

[0092] It is understood that the above embodiments only illustrate some implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this application's patent. It should be noted that for those skilled in the art, without departing from the concept of this application, the above technical features can be freely combined, and several modifications and improvements can be made, all of which fall within the protection scope of this application. Therefore, all equivalent transformations and modifications made with respect to the scope of the claims of this application should fall within the coverage of the claims of this application.

Claims

1. A molten salt tank type heat collection device, characterized in that, include: A solar collector (10) that tracks the rotation of the sun, the solar collector (10) including a heat collection tube (11) for collecting heat. The connecting assembly (20) includes a metal hose (21), a first connecting pipe (22), and a second connecting pipe (23) that connects one end of the metal hose (21) to the fixed pipe (2); the other end of the metal hose (21) is connected to the end of the heat collection pipe (11) through the first connecting pipe (22).

2. The molten salt tank type heat collection device according to claim 1, characterized in that, The first connecting pipe (22) is bent or curved, with its first end connected to the heat collection pipe (11) and its second end bent or curved toward the fixed pipe (2), and the port of the second end is perpendicular to the extension direction of the heat collection pipe (11); when the angle of the heat collector (10) is 90°, the port of the second end is toward the direction of gravity.

3. The molten salt tank type heat collection device according to claim 2, characterized in that, The end of the second connecting pipe (23) connected to the metal hose (21) is located horizontally at the end of the heat collection pipe (11), and its port faces the extension direction parallel to the heat collection pipe (11).

4. The molten salt tank type heat collection device according to claim 2, characterized in that, The end of the second connecting pipe (23) connected to the metal hose (21) is located horizontally on one side of the heat collection pipe (11), and the port faces horizontally and perpendicular to the extension direction of the heat collection pipe (11).

5. The molten salt tank type heat collection device according to claim 1, characterized in that, When the working angle of the collector (10) is set to -20° to 120°, the fixed pipe (2) and the connecting assembly (20) are arranged in the horizontal direction on the side of the collector (10) with the opening facing at 120°, or the fixed pipe (2) and the connecting assembly (20) are arranged in the horizontal direction at the end of the collector (10). When the working angle of the collector (10) is set to 0° to 180°, the fixed pipe (2) and the connecting assembly (20) are arranged in the horizontal direction at the end of the collector (10).

6. The molten salt tank type heat collection device according to claim 5, characterized in that, The metal hose (21), the first connecting pipe (22) and the second connecting pipe (23) are made of 321 stainless steel.

7. The molten salt tank type solar collector according to any one of claims 1 to 5, characterized in that, The metal hose (21) is a metal corrugated pipe, and the first connecting pipe (22) and the second connecting pipe (23) are metal rigid pipes.

8. The molten salt tank type heat collection device according to claim 7, characterized in that, The corrugated height of the metal flexible hose (21) is greater than or equal to 8 mm and less than or equal to 15 mm; And / or, the wave pitch of the metal hose (21) is greater than or equal to 5 mm and less than or equal to 15 mm.

9. The molten salt tank type solar collector according to any one of claims 1 to 5, characterized in that, The wall thickness of the metal flexible hose (21) is greater than or equal to 0.6 mm and less than or equal to 1.5 mm.

10. The molten salt tank type solar collector according to any one of claims 1 to 5, characterized in that, The length of the metal flexible hose (21) is greater than or equal to 5m and less than or equal to 10m; And / or, the bending radius of the metal hose (21) is greater than or equal to 800 mm and less than or equal to 1500 mm.

11. The molten salt tank type solar collector according to any one of claims 1 to 5, characterized in that, The connecting assembly (20) further includes at least one support base (24); the second connecting pipe (23) is disposed on the at least one support base (24); or, the end of the second connecting pipe (23) and the fixed pipe (2) connected to the second connecting pipe (23) is disposed on the at least one support base (24).

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