Groove type solar heat collector and heat collecting tube of heat collector

Abstract

The utility model discloses a groove type solar heat collector and a heat collecting tube of the heat collector, and belongs to the technical field of solar heat collectors. The heat collecting pipe of the heat collector comprises a heat collecting pipe base body, the heat collecting pipe base body comprises an outer pipe, a connector assembly is connected to the heat collecting pipe base body, a liquid inlet and a liquid outlet are formed in the connector assembly, the liquid inlet and the liquid outlet are communicated with the heat collecting pipe base body, and the liquid inlet and the liquid outlet are both formed in the middle of the heat collecting pipe. A stainless steel inner pipe is arranged in the outer pipe, a composite coating is arranged on the outer surface of the stainless steel inner pipe, a flow guide mechanism is arranged between the interior of the outer pipe and the periphery of the stainless steel inner pipe, and the flow guide mechanism can prolong the flowing path of a heat conduction working medium in the pipe. The solar water heater is simple in structure, heat conduction working media are arranged in a middle-in and middle-out structure, the liquid inlet and the liquid outlet are both formed in the middle of the heat collection pipe, the number of external pipeline elbows is reduced, and installation is easy and convenient; and an original heat conduction oil outer pipe is omitted, so that the heat loss of the pipeline and the manufacturing cost are reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of solar heat collector, more specifically, relate to a kind of trough type solar heat collector and heat collector heat collecting pipe. BACKGROUND

[0002] Trough heat collector is a kind of light heat conversion mode, through focusing, reflection and absorption process realizes the conversion of light energy to heat energy, so that heat exchange medium reaches certain temperature, to meet the needs of different load heat collecting device.Trough heat collector belongs to the category of medium-high temperature heat collector, can make heat exchange medium obtain relatively high temperature, can be used to thermal power generation, seawater desalination, heating engineering, absorption refrigeration and other life and production fields.Trough heat collector occupies a dominant position in solar energy utilization system, it provides heat source for system, and its efficiency and investment cost will affect the efficiency and economy of the entire heat collecting system.

[0003] At present, the heat collecting pipe of heat collector mostly adopts end oil feeding mode, and there are problems of crude oil cracking or coating aging caused by high temperature at the end during single-end oil feeding, and the axial temperature gradient caused by traditional single-end oil feeding not only affects local temperature change, leading to temperature difference layer of heat transfer oil in heat collecting pipe, which may cause the difference of heat collecting pipe expansion, thereby causing bending phenomenon, and the heat collecting pipe has large heat loss during work, and heat collecting efficiency is reduced. UTILITY MODEL CONTENTS

[0004] The utility model provides a kind of trough type solar heat collector and heat collector heat collecting pipe to the technical problem existing in prior art.

[0005] To solve the above technical problems, the utility model provides the following technical scheme:

[0006] A kind of trough type solar heat collector heat collecting pipe, including heat collecting pipe base body, heat collecting pipe base body includes outer tube, connector assembly is connected on heat collecting pipe base body, inlet and outlet are equipped on connector assembly, inlet and outlet are communicated with heat collecting pipe base body, inlet and outlet are all arranged in the middle part of heat collecting pipe;

[0007] Stainless steel inner tube is equipped in the inside of outer tube, the outer surface of stainless steel inner tube is equipped with composite coating, flow guide mechanism is equipped between the inside of outer tube and the outer periphery of stainless steel inner tube, flow guide mechanism can extend the flow path of heat transfer working medium in pipe.

[0008] Preferably, the two ends of connector assembly are communicated with the end of heat collecting pipe base body respectively, the end of stainless steel inner tube is equipped with channel mouth communicated with outer tube, inlet is communicated with stainless steel inner tube, and outlet is communicated with outer tube.

[0009] Preferably, the liquid inlet is arranged adjacent to the liquid outlet, the liquid inlet and the liquid outlet are oriented in the same direction, the joint assembly is internally provided with a pipeline structure matched with the heat collecting tube base body, the joint assembly is provided with an internal passage and an external passage, the internal passage is communicated with the stainless steel inner tube, the external passage is communicated with the outer tube, and the liquid inlet is connected with the internal passage and the liquid outlet is connected with the external passage.

[0010] Preferably, the flow guide mechanism is a spiral line structure arranged on the outer circumferential side of the stainless steel inner tube, and the spiral angle is 30-60 degrees.

[0011] Preferably, the spiral line structure is arranged on the inner wall of the outer tube, the spiral line structure comprises a flow guide path formed by a single spiral or a plurality of spirals, and the inner wall of the outer tube and the outer wall of the stainless steel inner tube are provided with a heat conducting medium flow passage.

[0012] Preferably, the composite coating comprises a metal absorption layer, a graded refractive index medium layer and an infrared reflection layer, and the graded refractive index medium layer is formed by alternately depositing AlO and SiO through magnetron sputtering to form a multilayer periodic structure.

[0013] Preferably, the heat collecting tube base body, the outer tube and the stainless steel inner tube are all linear anti-bending pipe structures.

[0014] Preferably, the heat collecting tube base body is provided with a plurality of heat collecting tube base bodies, and the plurality of heat collecting tube base bodies are arranged in series by means of the butt joint mechanism.

[0015] Preferably, the two ends of the heat collecting tube are provided with covers, the butt joint mechanism is a flange connecting plate arranged at the end of the heat collecting tube base body, and the adjacent heat collecting tube base bodies are connected through the flange connecting plate.

[0016] Further, the utility model also provides a groove type solar heat collector, including reflector, support mechanism, rotary drive mechanism, still include above-mentioned heat collecting tube, heat collecting tube is supported and is arranged at the parabolic surface center focal point of the front of reflector through heat collecting tube support, and is connected with steam hot water system on heat collecting tube.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The embodiment has simple structure, the heat conducting medium adopts the structure of inlet and outlet in the middle, the inlet and the outlet are arranged in the middle part of the heat collecting tube, the number of external pipeline bends is reduced, and installation is simple; and the original heat conducting oil outer tube is omitted, the pipeline heat loss and the manufacturing cost are reduced, the flow guide mechanism is arranged, the contact area of fluid and the pipe wall is increased, the flow path of the heat conducting medium in the pipe is prolonged, the turbulent effect and the heat exchange efficiency of the heat collecting tube are enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor.

[0020] Figure 1 The structure schematic view of the heat collecting pipe base body of the present application;

[0021] Figure 2 The structure schematic view of the joint assembly of the present application;

[0022] Figure 3 The structure schematic view of the flow guide mechanism of the present application;

[0023] Figure 4 The structure schematic view of the heat collecting pipe of the present application;

[0024] Figure 5 The structure schematic view of the trough type solar heat collector of the present application.

[0025] Explanation of the symbols in the drawing:

[0026] 1, heat collecting pipe base body; 2, outer pipe; 3, joint assembly; 4, liquid inlet; 5, liquid outlet; 6, stainless steel inner pipe; 61, passage opening; 7, flow guide mechanism; 8, heat collecting pipe; 9, flange connecting plate; 10, reflector; 11, support mechanism; 12, rotary drive mechanism. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects of the present application more clearly, the following will be further described in detail in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0028] Embodiment 1

[0029] Please refer to Figure 1 The present application provides a kind of trough type solar heat collector heat collecting pipe, including heat collecting pipe base body 1, heat collecting pipe base body 1 including outer pipe 2, heat collecting pipe base body 1 is connected with joint assembly 3, joint assembly 3 is equipped with liquid inlet 4 and liquid outlet 5, liquid inlet 4, liquid outlet 5 are communicated with heat collecting pipe base body 1, liquid inlet 4, liquid outlet 5 are all arranged in the middle part of heat collecting pipe;

[0030] The outer tube 2 is internally provided with a stainless steel inner tube 6, the outer surface of the stainless steel inner tube 6 is provided with a composite coating, and a flow guide mechanism 7 is arranged between the inner part of the outer tube 2 and the outer periphery of the stainless steel inner tube 6, which can extend the flow path of the heat-conducting working medium in the tube.

[0031] The embodiment has simple structure, the heat-conducting working medium adopts the structure of entering and exiting from the middle part, the liquid inlet 4 and the liquid outlet 5 are arranged at the middle part of the heat collecting tube, which can reduce the number of external pipeline bends, is simple to install, and saves the original heat-conducting oil outer tube, reduces the pipeline heat loss and manufacturing cost, increases the contact area of the fluid and the tube wall by arranging the flow guide mechanism 7, extends the flow path of the heat-conducting working medium in the tube, enhances the turbulent flow effect and the heat exchange efficiency of the heat collecting tube.

[0032] In the embodiment, as shown in Figure 2 The joint assembly 3 and the heat collecting tube base 1 adopt a split detachable structure, which is convenient for transportation, simple to disassemble, does not need to disassemble the whole tube during maintenance, is convenient for installation and maintenance, and saves working hours.

[0033] Specifically, the joint assembly 3 is arranged at the middle part of the heat collecting tube, the two ends of the joint assembly 3 are respectively communicated with the ends of the two heat collecting tube bases 1, the joint assembly 3 is internally provided with a pipeline structure matched with the heat collecting tube base 1, the liquid inlet 4 and the liquid outlet 5 arranged on the joint assembly 3 are adjacently arranged, and the liquid inlet 4 and the liquid outlet 5 are oriented in the same direction; the joint assembly 3 is provided with an internal passage and an external passage, the liquid inlet 4 is connected with the internal passage, the liquid outlet 5 is connected with the external passage, and the two ends of the internal passage are communicated with the stainless steel inner tube 6 of the heat collecting tube base 1, and the external passage is communicated with the outer tube 2 of the heat collecting tube base 1.

[0034] In the embodiment, as shown in Figure 1 The liquid inlet 4 is communicated with the stainless steel inner tube 6, the liquid outlet 5 is communicated with the outer tube 2, the end of the stainless steel inner tube 6 is provided with a passage opening 61 communicated with the outer tube 2, when the heat-conducting working medium enters the stainless steel inner tube 6 through the liquid inlet 4, flows to the end, and then enters the outer tube 2 through the passage opening 61 at the end of the stainless steel inner tube 6, and flows out of the heat collecting tube through the liquid outlet 5 after flowing in the heat collecting tube. The heat collecting tube in the embodiment adopts the liquid inlet setting of entering and exiting from the middle part, the heat-conducting working medium enters the heat collecting tube from the middle liquid inlet 4, flows symmetrically from two ends, and then exits from the same middle liquid outlet, the heat-conducting working medium is uniformly heated along the whole length of the heat collecting tube, reduces the axial temperature gradient caused by the traditional single-end oil inlet, reduces the temperature difference, reduces the local overheating, solves the problem of traditional bent tube explosion, can reduce the number of external pipeline bends, reduces the installation nodes, is simple to install, saves the cost.

[0035] As shown in Figure 3 The flow guide mechanism 7 is a spiral line structure arranged on the outer periphery side of the stainless steel inner tube, and the spiral angle is 30°-60°.

[0036] Specifically, a spiral structure is provided on the inner wall of the outer tube 2. The spiral structure includes a spiral flow guide structure arranged along the axial direction of the stainless steel inner tube 6. A heat transfer fluid flow channel is provided between the inner wall of the outer tube 2 and the outer wall of the stainless steel inner tube 6. The spiral flow guide structure is located between the inner wall of the outer tube 2 and the outer wall of the stainless steel inner tube 6.

[0037] Furthermore, in this embodiment, the helical structure may include a flow path formed by protrusions or grooves created by a single or multiple helices. The working fluid circulating from the stainless steel inner tube 6 flows into the outer tube 2 and then circulates along the outer tube 2 through the helical structure. The helical structure increases the contact area between the fluid and the tube wall, extends the flow path of the heat-conducting working fluid within the tube, thereby enhancing the turbulence effect and heat exchange efficiency. It also helps to uniformize the temperature field, reduce the axial temperature gradient, avoid localized overheating, and make the outlet temperature distribution more uniform, thus improving the heat collection efficiency of the collector.

[0038] Furthermore, in a preferred embodiment of this invention, the outer tube 2 can adopt a spiral tube structure. The specific angle and shape of the spiral structure can be adjusted according to actual heat exchange requirements. By setting a spiral flow guiding structure on the inner wall of the outer tube 2, not only can flow be guided, but the spiral structure also disrupts the laminar flow state of the fluid, forming a secondary swirling flow, increasing the contact area between the fluid and the tube wall. The spiral structure can reduce the temperature gradient and lower the thermal resistance by adjusting the synergy between the flow velocity and the temperature field. Moreover, a synergistic design of different types of tubes can be adopted to compensate for differences in thermal expansion and reduce the risk of deformation caused by temperature gradients.

[0039] Furthermore, in this embodiment, the heat collection tube substrate 1, outer tube 2, and stainless steel inner tube 6 are all straight-line anti-bend tube structures, and the heat transfer fluid flows in a straight line. It is then guided into a turbulent flow state through a spiral tube, which reduces resistance and makes the flow velocity uniform. While achieving uniform temperature of the heat collection tube, it also reduces temperature difference and thermal resistance, and reduces heat loss.

[0040] In this embodiment, the composite coating includes a metal absorption layer, a gradient refractive index dielectric layer, and an infrared reflection layer. The gradient refractive index dielectric layer forms a multi-layer periodic structure by alternating deposition of AlO and SiO through magnetron sputtering.

[0041] Specifically, by precisely controlling the deposition ratio and number of layers of the two materials, a continuous refractive index gradient is formed. The composite coating can achieve impedance matching in a wide spectral range (380-2500nm), resulting in low reflectivity of incident light, reduced reflection loss, improved heat exchange efficiency of the heat collection tube, and extended service life.

[0042] Furthermore, such as Figure 4 As shown, the heat collection tube 8 includes several heat collection tube bases 1, which are connected in series by a docking mechanism.

[0043] Specifically, the joint assembly 3 is symmetrically provided with a plurality of heat collecting tube bases 1 at both ends, the heat collecting tube bases 1 are spliced and assembled, the both ends of the heat collecting tube 8 are provided with covers, the abutting mechanism is a flange connecting plate 9 arranged at the end of the heat collecting tube base, the adjacent heat collecting tube bases 1 are connected through the flange connecting plate 9, and after the heat collecting tube base 1 is stably connected with the joint assembly 3, the internal and external passages of the heat collecting tube are connected with each other.

[0044] Further, in actual use, the specific installation length of the heat collecting tube can be selected as required, spliced and assembled, and a multi-segment splicing and assembling structure is adopted, which not only facilitates transportation, but also can realize modular expansion, form an array through series connection or series-parallel connection layout of multiple groups of heat collecting tubes, form a large-scale heat collecting mirror field, increase the total heat collecting area, and reduce the cost; and under the action of the support member, high safety and bending resistance of the heat collecting tube are realized.

[0045] Moreover, the embodiment adopts a direct connection structure of a middle-in middle-out heat collecting tube, the heat conducting oil enters from the middle position of the heat collecting tube 8, is divided into two symmetrical branches and flows to the left and right ends along the stainless steel inner tube 6, flows into the outer tube after turning back at the outlet of the inner tube end, and then flows out from the middle outlet, forming a double-circuit U-shaped path. The double-circuit design makes the pipe body heat more evenly, avoids the axial temperature gradient caused by traditional single-end oil inlet, reduces the temperature difference and heat loss, and reduces local overheating. The symmetrical flow design can offset the thermal expansion stress, reduce the risk of pipeline deformation, solve the problem of pipe explosion of traditional elbow pipes, can be applied to scenes with high irradiance or large temperature difference, and can reduce the number of external pipeline elbows, reduce the installation nodes, facilitate installation, and reduce installation cost.

[0046] In the embodiment, the heat collecting tube 8 can be compatible with multiple working media, and in actual use, heat conducting oil, molten salt or other media can be selected as the heat conducting medium of the heat collector as required.

[0047] Embodiment 2

[0048] As shown in Figure 5 The embodiment provides a trough type solar heat collector, which comprises a reflector 10, a support mechanism 11, a rotary driving mechanism 12, and the heat collecting tube 8 described above, the heat collecting tube 8 is supported and arranged at the center focus point of the parabolic surface in front of the reflector 10 through a heat collecting tube support, and a steam hot water system is connected to the heat collecting tube 8.

[0049] Specifically, the reflector 10 is a parabolic trough mirror structure, the reflector 10 is supported and arranged through a support cross beam, the support mechanism 11 is provided with a support column, the rotary driving mechanism 12 comprises a horizontal rotary driving part and a pitching rotary driving part, the horizontal rotary driving part and the pitching rotary driving part are used for adjusting the horizontal orientation angle and the pitching height angle of the reflector 10, the reflector 10 can be adjusted in real time according to the rotation of the sun, the heat conducting medium in the heat collecting pipe 8 is heated through the reflector 10, and the heat collecting pipe 8 is used for external systems.

[0050] Further, in the actual application process, the horizontal rotary driving part and the pitching rotary driving part can select the driving components as required, can adopt rotary reducers, electric push rods or other driving structures for driving, and cooperate with the rotary joints, rotary support bearings or other connecting pieces to realize the stable rotary driving of the reflector.

[0051] The embodiment changes the disadvantage that the traditional single-axis solar energy can only be fixed in a single direction, considers both winter and summer, realizes the omnidirectional automatic tracking rotation of the solar energy, and makes the sunlight always irradiate on the reflector 10, so that the solar energy can be maximized to be absorbed in all seasons, the heat can be maximized to be collected and absorbed, the solar energy utilization rate is higher, high-precision light collection is realized, the structural gravity center of the equipment is stable, the overall weight is kept in the support column at any angle, the equipment has high wind resistance level without increasing other accessory function structures such as wind resistance frames, the tracking precision is not affected by external weather, and the equipment has high stability.

[0052] Further, the length of the heat collecting pipe 8 can be customized according to the actual use scene and heat exchange demand of the customer, the heat collecting pipe 8 can adapt to different working condition demands, can be transported in sections, and is assembled on site, so that the transportation convenience is improved, and the installation is simple.

[0053] The utility model provides a kind of trough type solar energy heat collector and heat collecting pipe of heat collector of simple installation, which cancels traditional heat conducting oil outer tube, adopts the circulation flow passage formed by stainless steel inner tube 6 and the passage between outer tube 2 and inner tube, eliminates the air interlayer between outer tube and heat collecting pipe, and reduces convection heat dissipation.

[0054] The utility model discloses a spiral flow guide mechanism is added, can not only flow guide, and spiral structure destroys the laminar state of fluid, forms secondary cyclone, increases the contact area of fluid and pipe wall, prolongs the flow path of heat conducting working medium in the pipe, enhances the turbulent effect and heat pipe heat exchange efficiency, and can even temperature field, reduces axial temperature gradient, avoids local overheating, makes the outlet temperature distribution more even, improves the heat collecting efficiency of heat collector.

[0055] And in actual use, the length of the heat collecting pipe 8 can be customized according to the actual use scene and heat exchange demand of the customer, and a multi-section splicing assembly structure is adopted, so that the heat collecting pipe 8 can be transported conveniently, transported in sections and spliced and assembled on site as required, the convenience of transportation is improved, installation is convenient, the installation length of the heat collecting pipe 8 can be selected as required, the heat collecting pipe 8 can adapt to different working condition demands, modular expansion can be realized, a plurality of heat collecting pipes are arranged in series or in series-parallel layout to form an array, a large-scale heat collecting mirror field is formed, the total heat collecting area is improved, and the total cost is reduced.

[0056] In the description of the utility model, it is understood that the orientation or positional relationship indicated by such terms as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0057] In addition, in the description of the present application, the meaning of "a plurality of" is two or more than two, unless otherwise explicitly and specifically limited.

[0058] The above only describes the preferred embodiment of the present application, and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A trough solar collector collector tube comprising a collector tube base body, the collector tube base body comprising an outer tube, characterized in that, The joint assembly is connected with the end of the heat collecting tube base, and the end of the stainless steel inner tube is provided with a channel opening communicated with the outer tube. The outer tube is internally provided with a stainless steel inner tube, the outer surface of the stainless steel inner tube is provided with a composite coating, and a flow guide mechanism is arranged between the inner part of the outer tube and the outer periphery of the stainless steel inner tube, which can extend the flow path of the heat conducting medium in the tube.

2. A collector tube for a trough solar collector according to claim 1, wherein The joint assembly is connected with the end of the heat collecting tube base, and the end of the stainless steel inner tube is provided with a channel opening communicated with the outer tube.

3. The evacuated-tube solar thermal collector of claim 1, wherein: The inlet and the outlet are arranged adjacent to each other and face the same direction, the joint assembly is internally provided with a pipeline structure matched with the heat collecting tube base, the joint assembly is provided with an internal passage and an external passage, the internal passage is communicated with the stainless steel inner tube, the external passage is communicated with the outer tube, the inlet is connected with the internal passage, and the outlet is connected with the external passage.

4. The evacuated-tube solar thermal collector of claim 1, wherein: The flow guide mechanism is a spiral line structure arranged on the outer periphery of the stainless steel inner tube, and the spiral angle is 30°-60°.

5. A collector tube for a trough solar collector according to claim 4, wherein The spiral line structure is arranged on the inner wall of the outer tube, the spiral line structure includes a flow guide path formed by a single spiral or a plurality of spirals, and the inner wall of the outer tube and the outer wall of the stainless steel inner tube are provided with a heat conducting medium flow passage.

6. The evacuated-tube solar thermal collector of claim 1, wherein: The composite coating includes a metal absorption layer, a gradient refractive index medium layer and an infrared reflection layer, and the gradient refractive index medium layer is formed by alternately depositing AlO and SiO through magnetic control sputtering to form a multilayer periodic structure.

7. The evacuated-tube solar thermal collector of claim 1, wherein: The heat collecting tube base, the outer tube and the stainless steel inner tube are all straight line type anti-bending pipe structures.

8. The evacuated-tube solar thermal collector of claim 1, wherein: The heat collecting tube base is provided with a plurality of heat collecting tube bases which are connected in series through the butt joint mechanism.

9. A collector tube for a trough solar collector according to claim 8, wherein The two ends of the heat collecting tube are provided with a cover, the butt joint mechanism is a flange connection plate arranged at the end of the heat collecting tube base, and the adjacent heat collecting tube bases are connected through the flange connection plate.

10. A trough solar collector comprising a mirror, a support mechanism, a rotary drive mechanism, characterized in that, The heat collecting tube is supported by the heat collecting tube support and arranged at the center focal point of the parabolic surface of the front surface of the reflector, and the heat collecting tube is connected with a steam hot water system.

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