Molten salt groove type heat collecting device

Abstract

The invention discloses a molten salt groove type heat collecting device which comprises a heat collector rotating along with the sun and a connecting assembly. The heat collector comprises a heat collecting pipe for collecting heat; the connecting assembly comprises a metal hose, a first connecting pipe and a second connecting pipe for communicating one end of the metal hose with the fixed pipeline; and the other end of the metal hose is communicated with the end part of the heat collecting pipe through the first connecting pipe. The overall structure of the device can be simplified, the number of potential leakage points is reduced, and the leakage risk is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of heat collectors, and in particular to a molten salt trough heat collector. Background Art

[0002] The connection assembly of the molten salt trough collector is a connection structure between the trough collector and the heat transfer medium mother pipe, which is used to connect the dynamically rotating trough collector and the fixed heat transfer medium mother pipe. The structure of the connection assembly must allow the collector to which it is connected to rotate when tracking the sun, and it must be stably connected to the fixed heat transfer medium mother pipe, while also ensuring the smooth flow of the molten salt medium between the two. Therefore, the connection assembly is set between the rotating collector and the fixed heat transfer medium, and it is necessary to compensate for the relative displacement caused by the change in the positional relationship between the collector and the fixed heat transfer medium mother pipe during the process of tracking the sun.

[0003] At the same time, the operating temperature of the molten salt trough collector is relatively high (up to 550°C or above), so the temperature difference between the equipment in operation and shutdown is relatively large, which causes the collector to undergo a certain amount of thermal expansion. Therefore, the connection component needs to be able to absorb the expansion displacement of the collector to ensure stable connectivity with the fixed heat transfer medium mother pipe.

[0004] At present, trough collectors that use thermal oil as the heat transfer medium need to use at least three spherical rotating joints and rigid connecting pipe sections connected in series to form a connection assembly to achieve the above multiple functions at the same time. However, this connection method requires more connecting parts, the overall structure is more complicated, and there are more potential leakage points, which in turn poses a greater risk of leakage. Summary of the invention

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

[0006] The technical solution adopted by the embodiment of the present application to solve the technical problem is:

[0007] A molten salt trough type heat collecting device is constructed, comprising:

[0008] A heat collector that tracks the rotation of the sun, the heat collector comprising a heat collecting tube that collects heat;

[0009] The connection assembly comprises a metal hose, a first connection pipe and a second connection pipe connecting one end of the metal hose to a fixed pipe; the other end of the metal hose is connected to the end of the heat collecting pipe through the first connection pipe.

[0010] In some embodiments, the first connecting tube is bent or curved, with the first end connected to the heat collecting tube, the second end bent or curved toward the fixed pipe, and the port of the second end is oriented perpendicular to the extension direction of the heat collecting tube; when the angle of the 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 hose is spaced apart from the end of the heat collecting pipe in the horizontal direction, and the port thereof is oriented parallel to the extension direction of the heat collecting pipe.

[0012] In some embodiments, the end of the second connecting pipe connected to the metal hose is spaced apart on one side of the heat collecting pipe in the horizontal direction, and the port is oriented in the horizontal direction and perpendicular to the extension direction of the heat collecting pipe.

[0013] In some embodiments, when the working angle of the heat 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 heat collector to which the opening faces when the heat collector is at 120°, or the fixed pipe and the connecting assembly are arranged in the horizontal direction at the end of the heat collector;

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

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

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

[0017] In some embodiments, the corrugation 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 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 5 m and less than or equal to 10 m;

[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 comprises at least one supporting seat; the second connecting pipe is disposed on the at least one supporting seat; or the second connecting pipe and the end portion where the fixed pipe is connected to the second connecting pipe are disposed on the at least one supporting seat.

[0023] The implementation of this application has at least the following beneficial effects:

[0024] By providing a metal hose, the present application can compensate for the relative displacement caused by the change in the positional relationship between the heat collecting tube and the fixed heat transfer medium tube during the rotation process through the material properties of its own flexible connection, absorb the torsion caused by the position change between the fixed pipe and the heat collecting tube during the rotation process, and avoid stress concentration. The present application can also absorb the expansion displacement of the heat collecting tube caused by temperature changes through the flexible structural properties of the metal hose itself. The connection assembly provided by the present application only requires a metal hose and two pipes for connection, which simplifies the overall structure of the device, reduces the number of potential leakage points, and reduces the risk of leakage. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0026] Figure 1 This is a schematic structural diagram of a molten salt trough type heat collection device in one embodiment of the present application;

[0027] Figure 2 for Figure 1 Schematic diagram of the collector structure. DETAILED DESCRIPTION

[0028] In order to have a clearer understanding of the technical features, purposes and effects of the present application, the specific implementation methods of the present application are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, are constructed and operated in a specific direction, and are only for the convenience of describing the present technical solution, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present application.

[0029] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intermediate elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third", etc. can explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0030] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0031] Figure 1 A molten salt trough heat collector 1 in one embodiment of the present application is shown, which can collect solar thermal energy and reduce the transfer to the internal heat transfer medium to achieve heat collection.

[0032] The molten salt trough heat collector 1 may include a heat collector 10 and a connection assembly 20. The heat collector 10 may rotate synchronously with the changing position of the sun to collect as much heat as possible during the sunlight exposure period. The connection assembly 20 is respectively connected to the fixed pipe 2 and the heat collector 10 to form a medium transmission channel for transmitting a heat transfer medium. The heat collector 10 can conduct the collected heat to the heat transfer medium, and the heat transfer medium is transmitted through the connection assembly 20 and the fixed pipe 2, and then can be transmitted to the heat-using equipment for using the collected heat.

[0033] Among them, see also Figure 2The heat collector 10 may include a rotating shaft 15 and a heat collecting tube 11. The heat collecting tube 11 is hollow inside and can flow a heat transfer medium. The heat collected by the heat collector 10 can be transferred to the heat transfer medium in the heat collecting tube 11. The rotating shaft 15 is arranged parallel to the heat collecting tube 11 and is spaced apart to rotate with the change of the sun's position, so as to drive the heat collector 10 as a whole to rotate with the change of the sun's position. The heat collecting tube 11 can rotate with the rotating shaft 15 as the axis.

[0034] The connection assembly 20 may include a metal hose 21, a first connection pipe 22, and a second connection pipe 23. The metal hose 21 is a soft tubular structure, one end of which is connected to the first connection pipe 22, and the other end is connected to the second connection pipe 23 to form a medium transmission pipeline, so that the heat transfer medium can absorb heat in the heat collecting pipe 11, and then flow in the medium transmission pipeline, so as to transfer the heat to the heat-using equipment for use. The first connection pipe 22 is arranged between the metal hose 21 and the heat collecting pipe 11, and the metal hose 21 is connected to the heat collecting pipe 11 through the first connection pipe 22. The second connection pipe 23 is arranged between the metal hose 21 and the fixed pipe 2, and the metal hose 21 is connected to the fixed pipe 2 through the second connection pipe 23.

[0035] It should be understood that during the operation of the molten salt trough type heat collector 1, the heat collecting tube 11 will rotate back and forth along at least part of its circumferential angle with the rotating shaft 15 as the axis, while the fixed pipe 2 cannot rotate. Therefore, the heat collecting tube 11 will produce a relative position change with the fixed pipe 2 on the circumferential position of the rotating shaft 15 during the rotation process. At this time, the connection structure provided between the fixed pipe 2 and the heat collecting tube 11 will rotate with the heat collecting tube 11 at one end, and be connected and fixed to the fixed pipe 2 at the other end, thereby generating torsion. If there is a rigid pipe in the connection structure, a concentration of torsional stress may occur at the connection, thereby causing leakage. If a plurality of rotary joints are provided in the connection structure to avoid the generation of torsional stress, the presence of the rotary joints also leads to the formation of leakage points, thereby causing a potential risk of leakage.

[0036] By providing the metal hose 21, the present application can absorb the torsion caused by the rotation of the heat collecting pipe 11 relative to the fixed pipe 2 through the material properties of its own flexible connection, thereby achieving a stable connection between the two. That is, the provision of the metal hose 21 avoids stress concentration.

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

[0038] The present application, by providing a connection assembly 20, only needs a metal hose 21 and two pipes (a first connection pipe 22 and a second connection pipe 23) for connection, so as to absorb thermal expansion and compensate for the relative displacement caused by the change in the positional relationship between the heat collecting pipe 11 and the fixed pipe 2, while also ensuring the smooth conduction of the medium transmission pipe. Such a structural setting reduces the number of components of the connection assembly and simplifies the overall structure of the device.

[0039] The setting of the connection assembly 20 can also prevent the fixed pipe 2, the connection assembly 20, and the heat collecting tube 11 from being subjected to stress such as torsional stress and bending stress, and can also ensure that the connection between them is not affected by stress concentration, and a stable connection is made to improve the structural stability of the device and ensure the stable operation of the equipment. The reduction in the number of components can also effectively reduce the number of connection points between components, thereby reducing the number of potential leakage points and reducing the risk of leakage.

[0040] It should be understood that there are currently connection structures that require the use of multiple rotary joints and multiple rigid pipes to achieve the connection between the fixed pipe 2 and the heat collecting pipe 11 while being able to compensate for the relative displacement between the fixed pipe 2 and the heat collecting pipe 11. The rotary joints are prone to leakage, so the number of various rotary joints will also affect the number of potential leakage points.

[0041] The present application achieves the target effect by providing the metal hose 21 without providing a rotary joint, thereby further reducing the number of potential leakage points.

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

[0043] like Figure 1As shown, the collector 10 may also include a reflector 12, a bracket 13, a connecting frame 14 and at least two supporting frames 16. The bracket 13 is arranged in a longitudinal direction, and the rotating shaft 15 and the reflector 12 are respectively arranged on the bracket 13. The reflector 12 is a longitudinally long arc plate-like structure, and its cross section perpendicular to the length direction is in an arc shape. The connecting frame 14 is vertically arranged on the bracket 13 perpendicular to the extension direction of the bracket 13, and is used to support the heat collecting tube 11. The heat collecting tube 11 can be arranged in parallel and spaced on the concave side of the curved reflector 12 with the support of the connecting frame 14. The concave side of the reflector 12 can reflect the sun's light to the heat collecting tube 11, thereby realizing heat collection. The at least two supporting frames 16 are arranged at intervals, and are respectively supported at two different positions of the rotating shaft 15 to achieve support for the collector 10 as a whole.

[0044] It should be understood that the axes of the reflector 12, the bracket 13, the heat collecting tube 11, and the rotating shaft 15 are arranged in parallel and spaced apart, and the direction of the parallel spacing of the four is substantially along the direction of gravity. The rotating shaft 15 can drive the bracket 13 to rotate synchronously with the sun, thereby driving the reflector 12 arranged on the bracket 13 to rotate synchronously, and at the same time, driving the heat collecting tube 11 to rotate synchronously through the connecting frame 14.

[0045] It should be understood that the rotating shaft 15 can be a one-stage rod-shaped structure, that is, it is set as a single shaft extending along the length direction of the bracket 13. Figure 1 As shown, a two-stage structure is provided, that is, two coaxially extending shafts can be provided. The two shafts can be coaxially provided on opposite sides of the bracket 13, and in this case, two support frames 16 can be provided correspondingly to support the two shaft sections respectively. No specific limitation is made here.

[0046] During the operation of the heat collector 10, the reflector 12 can be arranged with the concave side always facing the sun driven by the rotating shaft 15. According to the movement path of the sun at different periods, the heat collector 10 can also be set with a rotation angle in the working state.

[0047] For example, Figure 2As shown, if the collector 10 is set to a north-south arrangement mode, its axial direction (the extension direction of the heat collecting tube 11) is extended in the north-south direction. The collector 10 can follow the sun's rise and set, and track the sun's rotation from east to west to collect heat. During the tracking process, the tracking angle of the collector 10 can be controlled and adjusted, and the two angles of the opening of the curved surface of the reflector 12 facing the horizontal direction are generally set to 0° and 180°. Furthermore, the horizontal angle of the opening of the curved surface of the reflector 12 facing the east is generally defined as 0°, the horizontal angle of the opening facing the west is defined as 180°, and the angle of the opening vertically facing the sky is defined as 90°. In the process of the sun rising in the east and setting in the west, the collector 10 can track the sun's rotation from 0° to 180°.

[0048] It should be understood that the working angle of the heat collector 10 can be a smaller angle range between 0° and 180°, for example, 45° to 180°, -20° to 120°, etc. However, the size of its working angle is not regarded as a limitation on the angle range in which the heat collector 10 can rotate, and the rotation angle range of the heat collector 10 can be greater than its working angle range, for example, its rotation angle range can be -15° to 180°, 0° to 195°, etc., which is not specifically limited here.

[0049] It should be understood that the existing collector 10 also has an east-west arrangement mode, which is not specifically limited here.

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

[0051] like Figure 1 As shown, in some embodiments, the first connecting pipe 22 can 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 opposite to each other, wherein the first end is connected to the end of the heat collecting pipe 11, and the second end is bent or folded toward the fixed pipe 2, and the end is connected to the metal hose 21.

[0052] The port at the first end is arranged in a horizontal direction. The port at the second end is arranged perpendicular to the extension direction of the heat collecting tube 11. When the angle of the heat collector 10 is 90°, the port at the second end is arranged in a direction of gravity (ie, downward).

[0053] It should be understood that since the metal hose 21 is a flexible soft pipe, it will bend downward under the action of gravity. If the first connecting pipe 22 is not provided, such deformation will cause additional stress to be generated at the connection between the metal hose 21 and the heat collecting pipe 11, which is not conducive to the structural stability of the pipeline.

[0054] By providing the first connecting pipe 22 , the position where the metal hose 21 is connected to the first connecting pipe 22 can be extended along the gravity direction, thereby avoiding the generation of bending stress and improving the structural stability.

[0055] In some embodiments, the connecting component 20 and the fixed pipe 2 can be arranged at the end of the collector 10 in the length direction, or at one side in the length direction thereof, so as to flexibly adjust the layout of the device and improve the space utilization of the device according to different situations while meeting the aforementioned functional requirements of the connecting component 20.

[0056] For example, when the rotation angle of the heat 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 heat collector 10 to which the opening faces when the heat collector 10 is at 120°, or they can also be arranged horizontally at the end of the heat collector 10. When the rotation angle of the heat 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 heat collector 10.

[0057] It should be understood that the fixed pipe 2 and the connecting component 20 are horizontally arranged 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 change the direction of the external force acting on the connecting component 20.

[0058] The structural setting of the first connecting pipe 22 and the second connecting pipe 23, or the angle setting of the two ports of the second connecting pipe 23 and the angle setting of the two ports of the second connecting pipe 23 can be adaptively adjusted according to the change of the positional relationship between the fixed pipeline 2 and the connecting assembly 20 and the collector 10 to reduce the stress influence on the metal hose 21.

[0059] The structural arrangement of the first connecting pipe 22 and the second connecting pipe 23 will be further described below through two specific position arrangement situations.

[0060] like Figure 1 As shown, 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] exist Figure 1 In the illustrated embodiment, the end of the second connecting pipe 23 connected to the metal hose 21 is spaced apart from the end of the heat collecting pipe 11 in the horizontal direction and is on the same plane as the heat collecting pipe 11. The two are spaced apart only in the height direction in other directions other than the axial direction of the heat collecting pipe 11. The orientation of the port of the second connecting pipe 23 connected to the metal hose 21 is parallel to the extension direction of the heat collecting pipe 11.

[0062] It should be understood that, since there is a horizontal distance between the second connecting pipe 23 and the end of the heat collecting pipe 11, the end of the metal hose 21 connected to the second connecting pipe 23 will be subjected to an inclined upward force component during the connection process, and the resultant force of the force component and the gravity can extend roughly in the horizontal direction. Setting the direction of the port connecting the second connecting pipe 23 and the metal hose 21 to extend horizontally can be closer to the direction of the resultant force received by the metal hose 21 at the end, thereby reducing the generation of stress and further improving the stability of the structure.

[0063] exist Figure 1 In the embodiment shown, the second connecting pipe 23 is a straight tubular structure. The end of the fixed pipe 2 connected to the second connecting pipe 23 is coaxially arranged with the second connecting pipe 23. The first connecting pipe 22 is roughly in the shape of a 90° bent pipe, which may include a horizontal edge and a vertical edge. One end of the horizontal edge is connected to the heat collecting pipe 11, and the other end is closed. The end of its vertical edge is connected to the metal hose 21.

[0064] In some other optional embodiments, when the fixed pipe 2 is located on one side of the extension direction of the heat collecting pipe 11 in the horizontal direction, the direction 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 pipe shape, an irregular bend pipe shape, etc., one end of which is connected to the metal hose 21, and the other end is connected to the fixed pipe 2.

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

[0066] When the fixed pipe 2 and the connection assembly 20 are located on one side of the heat collector 10 in the horizontal direction (not shown in the figure), the end of the second connection pipe 23 connected to the metal hose 21 is located horizontally at a distance from the side of the extension direction of the heat collecting pipe 11. The end of the second connection pipe 23 connected to the metal hose 21 is oriented in the horizontal direction and perpendicular to the extension direction of the heat collecting pipe 11.

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

[0068] In various embodiments of this arrangement, there are various options for the extension direction of the end portion of the fixed pipe 2 connected to the second connecting pipe 23. For example, the extension direction may be set to be perpendicular to the extension direction of the heat collecting pipe 11, or may be set to be parallel to the extension direction of the heat collecting pipe 11, etc.

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

[0070] When the end of the fixed pipe 2 connected to the second connecting pipe 23 extends horizontally and is arranged parallel to the heat collecting pipe 11, the second connecting pipe 23 can be set as a bent or curved tubular structure to change the port orientation of both ends, one end is perpendicular to the heat collecting pipe 11, and is used to communicate with the metal hose 21. The other end is parallel to the heat collecting pipe 11, and is used to communicate with the fixed pipe 2. Specifically, the second connecting pipe 23 in this embodiment can be set to L-shape, T-shape, arc shape, Z-shape, etc., which is not specifically limited here.

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

[0072] For example, the first connecting pipe 23 may include a horizontal pipe section and a vertical pipe section, wherein the vertical pipe section is located at one end of the horizontal pipe section, and its vertical end opening is arranged downward, and is used to communicate with the metal hose 21. The horizontal pipe section may be arranged in a curved or bent shape so as to be close to the fixed pipe 2 located on one side of the heat collecting pipe 11. Specifically, the horizontal pipe section may be arranged in a C-shape, a concave shape, a Z-shape, etc., which is not specifically limited here.

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

[0074] In some embodiments, the metal hose 21 is a metal bellows, and the first connecting tube 22 and the second connecting tube 23 are metal rigid tubes.

[0075] By configuring the first connecting pipe 22 and the second connecting pipe 23 as rigid structures, the stability of the connection between the two and the heat collecting pipe 11 and the fixed pipe 2 respectively can be improved, thereby preventing the heat collecting pipe 11 and the fixed pipe 2 from being affected by greater stress.

[0076] By setting the metal hose 21 as a bellows, its good flexibility can be utilized to adapt to the bending requirements of the metal hose 21 during the process of tracking the rotation of the sun by the collector 10, reducing the demand for connecting pipes (first connecting pipe 22, second connecting pipe 23), and reducing the difficulty and cost of installation. The bellows also has a high torsional stiffness characteristic. After torsional buckling, it can still withstand increased torque within a certain range. When subjected to a large torsional load, it can also ensure good structural rigidity to avoid leakage.

[0077] The setting of the bellows can cooperate with the port orientation setting of the first connecting pipe 22 and the second connecting pipe 23 to further improve the stable connection of the heat collecting pipe 11 under various connection position changes during the process of tracking the rotation of the sun, avoiding leakage problems.

[0078] In some embodiments, the wave height of the metal hose 21 is greater than or equal to 8 mm and less than or equal to 15 mm. For example, it can be 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 the range.

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

[0080] In some embodiments, the metal hose 21 may be covered with a protective cover to further improve the structural performance of the metal hose 21 , while also playing a certain role in heat preservation and reducing heat loss.

[0081] In some embodiments, the connection assembly 20 can be made of 321 stainless steel or a material with higher performance than this material. The 321 stainless steel also has good high temperature resistance and high temperature corrosion resistance to meet the working environment with a temperature greater than or equal to 550°C and a pressure greater than or equal to 4MPa. At the same time, it also has high mechanical properties, creep resistance and stress fracture performance, and has high tensile strength, yield strength, elongation and hardness.

[0082] In some embodiments, the interconnection between the fixed pipe 2, the first connecting pipe 22, the metal hose 21, the second connecting pipe 23, and the heat collecting pipe 11 can be achieved by welding to avoid the risk of leakage at the connection, thereby further reducing the number of potential leakage points of the entire 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 the temperature requirements and the 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 the range.

[0084] In some embodiments, the bending radius of the metal 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 the range.

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

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

[0087] Furthermore, since the heat collecting tube 11 has a certain amount of expansion when in operation and when out of operation, the demand for expansion compensation can be met by adjusting the bending radius and / or length of the metal hose 21. The length and / or bending radius must ensure that the compensable expansion is not less than 1200 mm.

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

[0089] It should be understood that the second connecting pipe 23 can be fixed to the support seat 24 through a connecting structure, and the connecting structure can be selected from bolts, clamps, connecting ropes, etc., which are not specifically limited here.

[0090] In some other optional embodiments, the second connecting pipe 23 and the end of the fixed pipe 2 connected to the second connecting pipe 23 can be both arranged on the support seat 24. Or at least two support seats 24 are arranged to support the second connecting pipe 23 and the fixed pipe 2 respectively.

[0091] exist Figure 1 In the illustrated embodiment, the support seat 24 is in the shape of a rectangular support block. In some other optional embodiments, the support seat 24 can also be in the shape of a bracket to increase the support height for fixing the pipe 2 and the connecting assembly 20.

[0092] It can be understood that the above embodiments only express some implementation methods of the present application, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present application; it should be pointed out that for ordinary technicians in this field, without departing from the concept of the present application, the above-mentioned technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the present application; therefore, all equivalent changes and modifications made to the scope of the claims of the present application should fall within the scope of the claims of the present application.

Claims

1. A molten salt trough type heat collection device, characterized in that: include: A heat collector (10) that tracks the rotation of the sun, wherein the heat collector (10) comprises a heat collecting tube (11) that collects heat; A connection assembly (20) comprises a metal hose (21), a first connection pipe (22), and a second connection pipe (23) for connecting one end of the metal hose (21) to a fixed pipe (2); the other end of the metal hose (21) is connected to the end of the heat collecting pipe (11) via the first connection pipe (22).

2. The molten salt trough type heat collector according to claim 1, characterized in that: The first connecting pipe (22) is bent or curved, with a first end connected to the heat collecting pipe (11), and a second end bent or curved in a direction close to the fixed pipe (2), and a port of the second end is oriented perpendicular to an extension direction of the heat collecting pipe (11); when the angle of the heat collector (10) is 90°, the port of the second end is oriented in the direction of gravity.

3. The molten salt trough type heat collector according to claim 2, characterized in that: The end of the second connecting pipe (23) connected to the metal hose (21) is located at an interval from the end of the heat collecting pipe (11) in the horizontal direction, and its port is oriented parallel to the extension direction of the heat collecting pipe (11).

4. The molten salt trough type heat collector according to claim 2, characterized in that: The end of the second connecting pipe (23) connected to the metal hose (21) is located at a distance from one side of the heat collecting pipe (11) in the horizontal direction, and the port is oriented in the horizontal direction and perpendicular to the extension direction of the heat collecting pipe (11).

5. The molten salt trough type heat collector according to claim 1, characterized in that: When the working angle of the heat 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 heat collector (10) to which the opening faces when the heat collector (10) is at 120°, or the fixed pipe (2) and the connecting assembly (20) are arranged in the horizontal direction at the end of the heat collector (10); When the working angle of the heat collector (10) is set to 0° to 180°, the fixed pipe (2) and the connection assembly (20) are arranged at the end of the heat collector (10) in the horizontal direction.

6. The molten salt trough type heat collector 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 trough type solar collector according to any one of claims 1 to 5, characterized in that: The metal hose (21) is a metal corrugated tube, and the first connecting tube (22) and the second connecting tube (23) are metal rigid tubes.

8. The molten salt trough type heat collector according to claim 7, characterized in that: The corrugation height of the metal 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 trough type solar collector according to any one of claims 1 to 5, characterized in that: 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.

10. The molten salt trough type solar collector according to any one of claims 1 to 5, characterized in that: The length of the metal hose (21) is greater than or equal to 5 m and less than or equal to 10 m; 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 trough type solar collector according to any one of claims 1 to 5, characterized in that: The connection assembly (20) further comprises at least one support seat (24); the second connection pipe (23) is arranged on the at least one support seat (24); or the second connection pipe (23) and the end portion of the fixed pipe (2) connected to the second connection pipe (23) are arranged on the at least one support seat (24).

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