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 around a rotating shaft along with the sun and a connecting assembly. The heat collector comprises a heat collecting pipe for collecting heat; the heat collecting pipe and the rotating shaft are arranged in parallel at an interval; the connecting assembly comprises a metal hose, a transmission shaft, a first connecting pipe and a rotating joint communicated with the heat transfer medium pipe; the rotating joint is provided with a first end and a second end communicated with the heat transfer medium pipe, the first end and the second end are communicated and relatively rotatably arranged, and the first end is communicated with the first connecting pipe; the first connecting pipe and the rotating shaft coaxially and synchronously rotate through the transmission shaft; one end of the metal hose is communicated with the end part of the heat collecting pipe, and the other end of the metal hose is communicated with the rotary joint through the first connecting pipe. The number of potential leakage points can be 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 rotates around a rotation axis to follow the sun, the heat collector comprising a heat collecting tube for collecting heat; the heat collecting tube is arranged parallel to the rotation axis and spaced apart;

[0009] A connecting assembly includes a metal hose, a transmission shaft, a first connecting pipe and a rotating joint connected to a heat transfer medium pipe; the rotating joint has a first end and a second end connected to the heat transfer medium pipe, the first end and the second end are connected to each other and are relatively rotatable, and the first end is connected to the first connecting pipe; the first connecting pipe is coaxial with the rotating shaft through the transmission shaft and rotates synchronously; one end of the metal hose is connected to the end of the heat collecting pipe, and the other end is connected to the rotating joint through the first connecting pipe.

[0010] In some embodiments, the first connecting pipe has a third end, a fourth end and a fifth end, the third end is connected to the first end of the rotary joint, the fourth end is connected to one end of the transmission shaft, and the fifth end is connected to one end of the metal hose;

[0011] Wherein, the connecting line between the third end and the fourth end is coaxially arranged with the transmission shaft, and the section from the fifth end to the third end is in a connected tube shape.

[0012] In some embodiments, the connecting assembly also includes a second connecting pipe, and the other end of the metal hose is connected to the heat collecting tube through the second connecting pipe; the second connecting pipe is bent or folded, one end of which is connected to the heat collecting tube, and the other end is bent or folded in a direction close to the heat transfer medium tube, and the port is oriented perpendicular to the extension direction of the heat collecting tube; when the collector angle is 90°, the end is oriented in the direction of gravity; the direction of the fifth end is parallel to the transmission shaft and the extension direction of the heat collecting tube.

[0013] In some embodiments, the rotary joint is a planar rotary joint.

[0014] In some embodiments, the metal hose includes a metal pipe and a heat-insulating outer shell sleeved outside the metal pipe.

[0015] In some embodiments, at least one electric heater is disposed within the thermal insulation housing.

[0016] In some embodiments, the wall thickness of the metal tube is greater than or equal to 0.6 mm and less than or equal to 1.5 mm.

[0017] In some embodiments, the bending radius of the metal hose is greater than or equal to 800 mm and less than or equal to 1500 mm;

[0018] And / or, the length of the metal hose is greater than or equal to 2 m and less than or equal to 5 m.

[0019] In some embodiments, at least two support frames are further included, and the rotating shaft and the connecting assembly are rotatably disposed on the at least two support frames respectively.

[0020] In some embodiments, the material of which the connection assembly is made includes 321 stainless steel.

[0021] The implementation of the embodiments of the present application has at least the following beneficial effects:

[0022] By setting a rotating joint, the present application can compensate for the relative displacement caused by the change in the position relationship between the heat collecting pipe and the fixed heat transfer medium pipe during the rotation process, absorb the torsion caused by the position change between the fixed pipe and the heat collecting pipe during the rotation process, and avoid stress concentration. By setting a metal hose, the present application can absorb the expansion displacement of the heat collecting pipe caused by temperature changes through its own flexible structural performance. The connection assembly provided by the present application only requires a metal hose and a rotating joint, 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

[0023] The present application will be further described below with reference to the accompanying drawings and embodiments, in which:

[0024] Figure 1 This is a schematic structural diagram of a molten salt trough type heat collection device in one embodiment of the present application;

[0025] Figure 2 This is a schematic structural diagram of a molten salt trough type heat collection device in another embodiment of the present application;

[0026] Figure 3 for Figure 1 or Figure 2 A schematic diagram of the structure of a metal hose in a molten salt trough type heat collector is shown;

[0027] Figure 4 yes Figure 1 or Figure 2 The schematic diagram of the structure of the collector in the molten salt trough type solar collector is shown. 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, a connection assembly 20, and a support assembly. The heat collector 10 can rotate synchronously with the changing position of the sun to collect as much heat as possible during sunlight exposure. The connection assembly 20 is respectively connected to the heat transfer medium pipe 2 and the heat collector 10 to form a medium transmission channel for transmitting the 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 heat transfer medium pipe 2, and then can be transmitted to the heat-using equipment for using the collected heat.

[0033] The 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 rotary joint 22, a transmission shaft 23 and a first connection pipe 24. The metal hose 21 is a soft tubular structure, one end of which is connected to the end of the heat collecting pipe 11, and the other end is connected to the rotary joint 22. The rotary joint 22 can be connected to the heat transfer medium pipe 2. The heat transfer medium pipe 2, the rotary joint 22, the first connection pipe 24, the metal hose 21 and the heat collecting pipe 11 are connected end to end 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 to transfer the heat to the heat-using equipment for use. The first connection pipe 24 can be coaxial with the rotating shaft 15 through the transmission shaft 23 and rotate synchronously.

[0035] Specifically, the rotary joint 22 has a first end and a second end opposite to each other, and the first end and the second end can be connected to each other. That is, the rotary joint 22 can be a tubular structure with two ends connected. The first end and the second end can be relatively rotatable, the first end can be connected to the first connecting pipe 24, and the second end can be connected to the heat transfer medium pipe 2. One end of the metal hose 21 can be connected to the end of the heat collecting pipe 11, and the other end can be connected to the first connecting pipe 24, and then connected to the rotary joint 22 and the heat transfer medium pipe 2 through the first connecting pipe 24.

[0036] It should be understood that during the operation of the molten salt trough type heat collecting device 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. The heat transfer medium tube 2 connected to the heat collecting tube 11 through the connecting assembly 20 may be a tubular structure that can rotate synchronously, or it may be a fixed tube structure that cannot rotate. If the heat transfer medium tube 2 is a fixed tube structure, the heat collecting tube 11 will produce a relative position change with the fixed heat transfer medium tube 2 in the circumferential position of the rotating shaft 15 during the rotation process. At this time, the connection structure arranged between the heat transfer medium tube 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 heat transfer medium tube 2 at the other end, thereby generating torsion.

[0037] The present application sets a rotary joint 22 that can rotate relative to the first end and the second end, so that when one end is fixed, the other end can still be set to rotate relative to each other. Under this premise, even if the heat transfer medium pipe 2 connected to the second end is a fixed pipe that cannot rotate, the first connecting pipe 24 connected to the first end can still rotate coaxially and synchronously under the drive of the transmission shaft 23 and the rotating shaft 15.

[0038] At the same time, by arranging the metal hose 21 between the first connecting pipe 24 and the heat collecting pipe 11, the first connecting pipe 24, the metal hose 21 and the heat collecting pipe 11 can be synchronously rotated around the axis of the rotating shaft 15, compensating for the relative displacement caused by the change in the position relationship between the heat collecting pipe 11 and the fixed heat transfer medium pipe 2 during the rotation process. Such an arrangement can absorb the torsion caused by the position change of the fixed pipeline and the heat collecting pipe during the rotation process, and also avoid the torsional stress generated in the first connecting pipe 24, the metal hose 21, the heat collecting pipe 11 body and the connection between the three. That is, it can avoid the concentration of stress and improve the service life of the equipment.

[0039] Furthermore, the present application can absorb the expansion displacement of the heat collecting pipe 11 due to temperature changes by setting the pipeline between the rotary joint 22 and the heat collecting pipe 11 as a hose structure (metal hose 21) through its own flexible structural performance. For example, when the heat collecting pipe 11 changes from the shutdown state to the operation state, due to the increase in temperature, its length expansion in the axial direction may increase. Since the first connecting pipe 24 is coaxially arranged with the rotating shaft 15 through the transmission shaft 23 and rotates synchronously, and the rotary joint 22 is stably connected to the fixed heat transfer medium pipe 2, the positional relationship between the rotary joint 22 and the collector 10 is relatively fixed. When the heat collecting pipe 11 undergoes thermal expansion, the distance from the end connected to the metal hose 21 to the rotary joint 22 along the extension direction of the rotating shaft 15 is reduced. The metal hose 21 arranged between the rotary joint 22 and the heat collecting pipe 11 can absorb the expansion through its own flexible deformation (such as increasing the curvature, etc.), and can also ensure the smooth conduction of the medium transmission pipeline.

[0040] The connection assembly 20 provided in the present application only requires a metal hose 21, a rotary joint 22 and a first connecting pipe 24, so as to absorb thermal expansion, compensate for the relative displacement caused by the change in the positional relationship between the heat collecting tube 11 and the fixed heat transfer medium pipe 2, and ensure the smooth conduction of the medium transmission pipeline.

[0041] Such a configuration can also prevent the heat transfer medium pipe 2, the rotary joint 22, the metal hose 21, the first connecting pipe 24, and the heat collecting pipe 11 from being subjected to stresses such as torsional stress and bending stress, and can also ensure that the connections between them are not affected by stress and are stably connected to improve the structural strength of the device.

[0042] It should be understood that leakage is more likely to occur at the joints, so the number of joints of various types will also affect the number of potential leakage points.

[0043] The present application significantly reduces the number of joints by only providing one rotary joint 22, thereby reducing the number of potential leakage points. The reduction in the number of connecting pipes and joints can also simplify the overall structure of the device, effectively reduce the number of connection points between components, further reduce the number of potential leakage points, and reduce the risk of leakage.

[0044] It should be understood that the number of the connection assembly 20 can be set to only one, located at one end of the heat collector 10. It can also be set to two, respectively arranged at the two opposite ends of the heat collector 10. The heat transfer medium pipe 2 can be a fixed heat transfer medium mother pipe for connecting with the heat-using equipment, or a pipeline structure that can rotate synchronously with the rotating shaft 15, or a rotary joint 22 of another connection assembly 20, etc. No specific limitation is made here.

[0045] For example, when two molten salt trough heat collectors 1 are connected end to end, the connection assembly 20 at one end of the first molten salt trough heat collector 1 can be connected to the heat transfer medium mother pipe. The connection assembly 20 of the second molten salt trough heat collector 1 can be connected to the connection assembly 20 at the other end of the first molten salt trough heat collector 1 directly or through a coaxially rotatable connection pipe.

[0046] The first molten salt trough type heat collector 1 is of the type with connection components 20 at both ends. The second molten salt trough type heat collector 1 may have connection components 20 at both ends or only at one end.

[0047] The heat transfer medium pipe 2 connected to the connection component 20 at one end of the first molten salt trough heat collector 1 is a fixed heat transfer medium mother pipe. The heat transfer medium pipe 2 connected to the connection component of the second molten salt trough heat collector 1 is the connection component 20 at the other end of the first molten salt trough heat collector 1, or a coaxially rotatable connecting pipe between the two connection components 20.

[0048] like Figure 1 and Figure 2As shown, the collector 10 may also include a reflector 12, a bracket 13 and a connecting frame 14. 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 arc reflector 12 with the support of the connecting frame 14. The concave side of the reflector 12 can reflect the sunlight to the heat collecting tube 11, thereby realizing heat collection.

[0049] 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 four are approximately in the same plane. 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 also driving the heat collecting tube 11 to rotate synchronously through the connecting frame 14.

[0050] It should be understood that the rotating shaft 15 may be a one-piece rod-shaped structure. Figure 2 As shown, it is configured as a two-stage structure, which is coaxially arranged on opposite sides of the bracket 13. No specific limitation is made here.

[0051] 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.

[0052] For example, Figure 4 As 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°.

[0053] 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°, 0° 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.

[0054] It should be understood that the existing collector 10 also has an east-west arrangement mode, which is not specifically limited here.

[0055] It should be understood that the collector 10 can adopt existing technology, which will not be further explained here.

[0056] like Figure 1 As shown, in some embodiments, the first connecting pipe 24 has a third end, a fourth end and a fifth end. The line connecting the third end and the fourth end is coaxially arranged with the transmission shaft 23 and the rotating shaft 15. The third end is connected to the first end of the rotary joint 22, and can be coaxially connected to the heat transfer medium pipe 2 through the rotary joint 22. The fourth end is coaxially connected to one end of the transmission shaft 23, and the other end of the transmission shaft 23 is coaxially connected to one end of the rotating shaft 15. The fifth end is connected to one end of the metal hose 21.

[0057] It should be understood that since the heat collecting tube 11, the metal hose 21, the rotary joint 22 and the heat transfer medium pipe 2 can be connected in sequence to form a medium transmission channel, the section between the fifth end and the third end must be in the shape of a connecting tube to realize the transmission of the heat transfer medium between the metal hose 21 and the heat transfer medium pipe 2.

[0058] Specifically, only the section between the fifth end and the third end of the first connecting tube 24 can be set as a hollow connecting tube, or the entire first connecting tube 24 can be set as a hollow connecting tube. That is, the fourth end of the first connecting tube 24 can be tubular or solid, which is not specifically limited here. The transmission shaft 23 and / or the rotating shaft 15 can be set as a solid columnar structure or a hollow tubular structure, which is not specifically limited here.

[0059] In some embodiments, the connection assembly 20 further includes a second connection pipe 25, which is disposed between the metal hose 21 and the heat collecting tube 11, and the two ends are respectively connected to the end of the metal hose 21 away from the rotary joint 22 and the end of the heat collecting tube 11. The second connection pipe 25 can be bent or curved to change the transmission direction of the medium transmission channel.

[0060] Specifically, one end of the second connecting pipe 25 is connected to the heat collecting pipe 11, and the other end is bent or folded in the direction close to the heat transfer medium pipe 2. The opening direction of the end of the second connecting pipe 25 connected to the heat collecting pipe 11 is consistent with the extension direction of the heat collecting pipe 11 to achieve docking of the two. The end of the second connecting pipe 25 connected to the metal hose 21 has its port facing perpendicular to the extension direction of the heat collecting pipe 11. When the angle of the collector 10 is 90°, the end of the second connecting pipe 25 connected to the metal hose 21 has its port facing the direction of gravity.

[0061] Specifically, in Figure 2 In the angle shown, the end of the second connecting pipe 25 connected to the heat collecting pipe 11 is opened in the horizontal direction. The end of the second connecting pipe 25 connected to the metal hose 21 extends toward the bottom of the heat collecting pipe 11, and the opening is set in the vertical direction (gravity direction). The opening direction of the fifth end of the first connecting pipe 24 is parallel to the extension direction of the heat collecting pipe 11.

[0062] 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 second connecting pipe 25 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.

[0063] By providing the second connecting pipe 25 , the position where the metal hose 21 is connected to the second connecting pipe 25 can be extended along the gravity direction, thereby avoiding the generation of bending stress and improving the structural stability.

[0064] exist Figure 1 In the embodiment shown, the second connecting pipe 25 is substantially T-shaped, one end of its horizontal side is connected to the heat collecting pipe 11 , and the other end is closed. The end of its vertical side is connected to the metal hose 21 .

[0065] exist Figure 2 In the illustrated embodiment, the second connecting pipe 25 is in an inverted L-shape.

[0066] In some other optional embodiments, the second connecting pipe 25 may also be in the shape of a quarter circle.

[0067] It should be understood that the second connecting pipe 25 has a horizontal distance between the rotating joint 22 and the end of the heat collecting tube 11, so the end of the metal hose 21 connected to the rotating joint 22 will be subjected to an inclined upward force during the connection process, and the resultant force of the force and gravity can extend roughly in the horizontal direction. Therefore, the opening direction of the fifth end of the first connecting pipe 24 is set to extend horizontally, which 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.

[0068] Specifically, the first connecting pipe 24 may include a first pipe section 241 and a second pipe section 242 .

[0069] exist Figure 1 In the embodiment shown, the first connecting tube 24 is roughly in an inverted T-shape, wherein the first tube section 241 is the horizontal side of the T-shape, and the two ends correspond to the third end and the fourth end respectively. The second tube section 242 is the vertical side of the T-shape, and its ends are closed, and the opening is located on the tube wall on one side of the second tube section 242, corresponding to the fifth end.

[0070] exist Figure 2 In the embodiment shown, the first pipe section 241 is a straight tubular structure, and the two ends correspond to the first side and the second side respectively. The second pipe section 242 is generally an inverted L-shaped structure, and the end of its vertical side is connected to the first pipe section 241, and the end of its horizontal side corresponds to the fifth end.

[0071] In some other optional embodiments, the second pipe segment 242 may also be configured as a quarter-circle arc structure, etc.

[0072] It is important to understand that Figure 1 and Figure 2 In the embodiment shown, the setting height of the heat transfer medium pipe 2 is lower than the setting height of the heat collecting pipe 11. The metal hose 21, in cooperation with the second connecting pipe 25 and the first connecting pipe 24, is in a downwardly concave quarter-circle arc structure under the action of gravity.

[0073] exist Figure 1 and Figure 2 In the embodiment described, the rotary joint 22 adopts an existing planar rotary joint.

[0074] In some other optional embodiments, the rotary joint 22 may also adopt other existing rotary structures with swinging functions such as fluid slip rings and Benecke rotary joints to achieve the same work effect.

[0075] like Figure 3As shown, in some embodiments, the metal hose 21 may include a metal tube 211 and a heat-insulating outer shell 212. The heat-insulating outer shell 212 may be a hollow tubular structure, which is sleeved outside the metal tube 211 to prevent heat loss.

[0076] In some embodiments, at least one electric heater (not shown in the figure) may be disposed in the heat-insulating outer shell 212 to provide heat to the heat transfer medium in the metal hose 21 in the form of electric heating.

[0077] It should be understood that the electric heater can be embedded in the shell wall of the heat-insulating shell 212, or can be arranged on its inner wall surface, or can be arranged on its outer wall surface, which is not specifically limited here. The number of the electric heater can be one, or two, three, or more, which is not specifically limited here.

[0078] In some embodiments, the wall thickness of the metal tube 211 is greater than or equal to 0.6 mm and less than or equal to 1.5 mm. 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, etc.

[0079] 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 to facilitate compensation of expansion. 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, etc.

[0080] In some embodiments, the length of the metal hose 21 can be greater than or equal to 2m and less than or equal to 5m, so as to achieve compensation for the expansion amount. For example, it can be set to 2.2m, 2.4m, 2.6m, 2.8m, 3m, 3.2m, 3.4m, 3.6m, 3.8m, 4m, 4.2m, 4.4m, 4.6m, 4.8m, etc.

[0081] 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.

[0082] 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 0°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.

[0083] In some embodiments, the mutual connection among the rotary joint 22, the metal hose 21, the transmission shaft 23, the second connecting pipe 25, the rotating shaft 15, and the heat collecting tube 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.

[0084] like Figure 1 and Figure 2 As shown, in some embodiments, the support structure may include at least two support frames 30, which are arranged at intervals to support the shaft system formed by the coaxial connection of the rotating shaft 15, the transmission shaft 23 and the rotating joint 22, and further support the entire collector 10 and the connecting assembly 20. The rotating shaft 15 and the connecting assembly 20 are rotatably arranged on at least two support frames 30, respectively.

[0085] exist Figure 1 and Figure 2 In the illustrated embodiment, there are two support frames 30 , one of which is disposed at the end of the rotating shaft 15 away from the transmission shaft 23 , and the other is disposed at the middle position of the transmission shaft 23 , so as to achieve overall support through support at both ends.

[0086] In some other optional embodiments, the number of the support frames 30 can also be set to three, corresponding to the positions of the rotating shaft 15, the transmission shaft 23 and the rotating joint 22. The number can also be set to four, five, six, etc., and at least two support frames 30 can be respectively provided at the position corresponding to the rotating shaft 15 and the position corresponding to the transmission shaft 23.

[0087] It should be understood that the support frame 30 should be arranged in a structure such that the rotating shaft 15 and the transmission shaft 23 arranged thereon can rotate freely. For example, it can be arranged in a concave shape, a square shape, or the like.

[0088] 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 collecting device, characterized in that: include: A heat collector (10) that rotates around a rotation axis (15) to follow the sun, the heat collector (10) comprising a heat collecting tube (11) for collecting heat; the heat collecting tube (11) is arranged parallel to the rotation axis (15) and spaced apart; A connection assembly (20) comprises a metal hose (21), a transmission shaft (23), a first connection pipe (24) and a rotary joint (22) connected to a heat transfer medium pipe (2); the rotary joint (22) has a first end and a second end connected to the heat transfer medium pipe (2), the first end and the second end are connected to each other and are relatively rotatable, and the first end is connected to the first connection pipe (24); the first connection pipe (24) is coaxial with the rotating shaft (15) through the transmission shaft (23) and rotates synchronously; one end of the metal hose (21) is connected to the end of the heat collecting pipe (11), and the other end is connected to the rotary joint (22) through the first connection pipe (24).

2. The molten salt trough type heat collector according to claim 1, characterized in that: The first connecting pipe (24) has a third end, a fourth end and a fifth end, the third end is connected to the first end of the rotary joint (22), the fourth end is connected to one end of the transmission shaft (23), and the fifth end is connected to one end of the metal hose (21); The connecting line between the third end and the fourth end is coaxially arranged with the transmission shaft (23), and the section from the fifth end to the third end is in the shape of a connected tube.

3. The molten salt trough type heat collector according to claim 2, characterized in that: The connection assembly (20) further comprises a second connection pipe (25), and the other end of the metal hose (21) is connected to the heat collecting pipe (11) through the second connection pipe (25); the second connection pipe (25) is arranged in a bent or folded manner, one end of which is connected to the heat collecting pipe (11), and the other end is bent or folded in a direction close to the heat transfer medium pipe (2), and the port is oriented perpendicular to the extension direction of the heat collecting pipe (11); when the angle of the collector (10) is 90°, the end faces the direction of gravity; the direction of the fifth end is parallel to the extension direction of the transmission shaft (23) and the heat collecting pipe (11).

4. The molten salt trough type heat collector according to claim 2, characterized in that: The rotary joint (22) is a planar rotary joint.

5. The molten salt trough type solar collector according to any one of claims 1 to 4, characterized in that: The metal hose (21) comprises a metal tube (211) and a heat-insulating outer shell (212) sleeved outside the metal tube (211).

6. The molten salt trough type heat collector device according to claim 5, characterized in that: At least one electric heater is arranged in the heat-insulating outer shell (212).

7. The molten salt trough type heat collector according to claim 5, characterized in that: The wall thickness of the metal tube (211) is greater than or equal to 0.6 mm and less than or equal to 1.5 mm.

8. The molten salt trough type solar collector according to any one of claims 1 to 4, characterized in that: The bending radius of the metal hose (21) is greater than or equal to 800 mm and less than or equal to 1500 mm; And / or, the length of the metal hose (21) is greater than or equal to 2 m and less than or equal to 5 m.

9. The molten salt trough type solar collector according to any one of claims 1 to 4, characterized in that: It also comprises at least two support frames (30), and the rotating shaft (15) and the connecting assembly (20) are respectively rotatably arranged on the at least two support frames (30).

10. The molten salt trough type solar collector according to any one of claims 1 to 4, characterized in that: The connecting assembly (20) is made of 321 stainless steel.

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