Cavity absorber based on linear Fresnel solar thermal collector

Abstract

The utility model relates to the technical field of solar thermal collectors, in particular to a cavity absorber based on a linear Fresnel solar thermal collector, which comprises a bottom plate, a fixing frame, a water tank and a steam container are arranged at the top of the bottom plate, and a plurality of groups of strip-shaped reflecting mirrors are rotatably connected between the left side and the right side of the fixing frame through reflecting mirror damping rotating shafts. The water pump pumps water in the water tank into the heat collecting pipe, sunlight irradiates on the multiple sets of strip-shaped reflectors, is reflected to the double-cambered-surface reflectors and then is refracted on the heat collecting pipe through the double-cambered-surface reflectors, so that water in the heat collecting pipe is heated to form water vapor, and then the water vapor enters the steam container through the hose and the steam inlet pipe. When the sun irradiation angle is changed, the output shaft of the motor drives the worm to rotate, the worm drives the worm gear to rotate, and the worm gear drives the connecting plate to rotate through the round rod, so that the double-cambered-surface reflector and the heat collecting pipe can be driven to rotate, the receiving area of solar rays is increased, and the solar energy conversion efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of solar thermal collectors, in particular to a cavity absorber based on a linear Fresnel solar thermal collector. Background Art

[0002] Solar collectors are devices that convert solar energy into thermal energy. They are the core components of solar thermal utilization. They are specifically divided into focusing collectors and non-focusing collectors. Focusing collectors can concentrate solar radiation with low energy flux density into radiant heat flux with high energy flux density. They are generally used in the field of medium and high temperature utilization of solar energy. Linear Fresnel collectors use a series of discrete mirrors to focus light into a focal line. The focal line position is generally a cavity absorber or a vacuum tube absorber. There is a flowing working fluid in the absorber. After being heated by the focused solar radiation, it is transported to the heat-using equipment. The performance of the absorber determines the efficiency of the solar thermal collector's light-to-heat conversion. Therefore, the design of the absorber is crucial to the utilization of solar thermal energy.

[0003] Cavity absorber is generally used for linear Fresnel collector. It is fixed above the collector mirror field and generally consists of an outer shell, an insulation layer, an internal cavity and a heat absorbing tube. The outer shell plays a supporting and protective role, the insulation layer can effectively block the heat loss in the cavity, and the cavity plays a role in collecting radiated heat. The heat absorbing tube is attached to the inner wall, and the flowing medium in the tube is generally heat transfer oil or water.

[0004] However, most of the cavity absorbers currently available are fixed and cannot change with the change of the solar radiation angle, thereby reducing the efficiency of solar energy conversion and having low practicality. To this end, we propose a cavity absorber based on a linear Fresnel solar collector to solve the above problem. Utility Model Content

[0005] The purpose of the utility model is to provide a cavity absorber based on a linear Fresnel solar collector to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a cavity absorber based on a linear Fresnel solar collector, comprising a base plate, a fixing frame, a water tank and a steam container are arranged on the top of the base plate, a plurality of groups of strip reflectors are rotatably connected between the left and right sides of the fixing frame through a reflector damping shaft, both ends of the reflector damping shaft extend outside the fixing frame for easy manual operation, two support plates are fixedly connected to the top of the fixing frame, a double-arc reflector and a heat collecting tube are arranged between the two support plates, connecting plates are fixedly connected on both sides of the double-arc reflector and the heat collecting tube, a round rod is fixedly connected on one side of the two connecting plates away from each other, the round rod is rotatably connected to the support plate through a bearing, the right end of one of the round rods on the right side extends outside the support plate and is fixedly connected to a worm gear, two rectangular plates are fixedly connected on the right side of the support plate on the right side, a worm is rotatably connected between the two rectangular plates, and the worm gear is meshed with the worm gear.

[0007] Further preferably, the round rod and the heat collecting tube are on the same axial line.

[0008] Further preferably, a motor is fixedly connected to the rear side of the rear rectangular plate, and the output shaft end of the motor is fixedly connected to the rear end of the worm.

[0009] Further preferably, a water pump is fixedly connected to the top of the water tank, a water inlet of the water pump extends into the water tank, and a water outlet of the water pump is connected to a water outlet pipe.

[0010] Further preferably, a steam inlet pipe is connected to the right side of the steam container.

[0011] Further preferably, a hose is embedded inside the connecting plate, and the bottom ends of the two hoses extend outside the connecting plate and are respectively connected to the water outlet pipe and the steam inlet pipe.

[0012] Further preferably, the bottom of the fixing frame is fixedly connected to the top of the base plate through four supporting legs.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows: the water pump of the utility model pumps the water in the water tank into the heat collecting tube, and after the sunlight is irradiated on multiple groups of strip reflectors, it is reflected to the double-arc reflector, and then refracted on the heat collecting tube by the double-arc reflector, so that the water in the heat collecting tube is heated up to form water vapor, and then enters the steam container through the hose and the steam inlet pipe. When the angle of sunlight changes, the output shaft of the motor drives the worm to rotate, the worm drives the worm wheel to rotate, and the worm wheel drives the connecting plate to rotate through the round rod, thereby driving the double-arc reflector and the heat collecting tube to rotate, thereby increasing the receiving area of ​​sunlight and improving the solar energy conversion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the main three-dimensional structure of the utility model;

[0015] Figure 2 It is a right-side stereoscopic structural schematic diagram of the utility model;

[0016] Figure 3 It is a schematic diagram of the double arc reflector focusing light when the light of the utility model is directly incident;

[0017] Figure 4 This is a schematic diagram of the double arc reflector focusing light when the light is incident obliquely in the utility model;

[0018] Figure 5 This is a schematic diagram of the structure of the connection between the heat collecting pipe and the hose inside the connection plate of the utility model;

[0019] Figure 6 for Figure 2 Schematic diagram of the enlarged three-dimensional structure of area A in the middle.

[0020] In the figure: 1, bottom plate; 2, fixing frame; 3, water tank; 4, steam container; 5, strip reflector; 6, reflector damping shaft; 7, double arc reflector; 8, heat collecting tube; 9, support plate; 10, round rod; 11, connecting plate; 12, worm gear; 13, rectangular plate; 14, worm; 15, motor; 16, water pump; 17, water outlet pipe; 18, steam inlet pipe; 19, hose; 20, support leg. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Example

[0023] See also Figure 1-6The utility model provides a technical solution: a cavity absorber based on a linear Fresnel solar collector, comprising a bottom plate 1, a fixing frame 2, a water tank 3 and a steam container 4 are arranged on the top of the bottom plate 1, a plurality of strip reflectors 5 are rotatably connected between the left and right sides of the fixing frame 2 through a reflector damping shaft 6, both ends of the reflector damping shaft 6 extend to the outside of the fixing frame 2 for easy manual operation, two support plates 9 are fixedly connected to the top of the fixing frame 2, a double-arc reflector 7 and a heat collecting tube 8 are arranged between the two support plates 9, both sides of the double-arc reflector 7 and the heat collecting tube 8 are fixedly connected with a connecting plate 11, a round rod 10 is fixedly connected to the side of the two connecting plates 11 away from each other, the round rod 10 is rotatably connected to the support plate 9 through a bearing, the right end of a round rod 10 on the right side extends to the outside of the support plate 9 and is fixedly connected with a worm gear 12, and the right side of the support plate 9 is fixedly connected to the worm gear 12. Two rectangular plates 13 are fixedly connected to the right side of the support plate 9, and a worm 14 is rotatably connected between the two rectangular plates 13, and the worm 14 is meshed with the worm wheel 12. When in use, the water pump 16 pumps the water in the water tank 3 into the heat collecting tube 8. After the sunlight is irradiated on the multiple groups of strip reflectors 5, it is reflected to the double-arc reflector 7, and then refracted on the heat collecting tube 8 by the double-arc reflector 7, so that the water in the heat collecting tube 8 is heated to form water vapor, and then enters the steam container 4 through the hose 19 and the steam inlet pipe 18. When the angle of sunlight changes, the output shaft of the motor 15 drives the worm 14 to rotate, and the worm 14 drives the worm wheel 12 to rotate. The worm wheel 12 drives the connecting plate 11 to rotate through the round rod 10, thereby driving the double-arc reflector 7 and the heat collecting tube 8 to rotate, thereby increasing the receiving area of ​​sunlight and improving the solar energy conversion efficiency.

[0024] In this embodiment, specifically: the round rod 10 and the heat collecting tube 8 are on the same axis;

[0025] In this embodiment, specifically: the rear side of the rear rectangular plate 13 is fixedly connected with a motor 15, and the output shaft end of the motor 15 is fixedly connected to the rear end of the worm 14, and the setting of the motor 15 achieves an automation effect;

[0026] In this embodiment, specifically: a water pump 16 is fixedly connected to the top of the water tank 3, a water inlet of the water pump 16 extends into the water tank 3, a water outlet of the water pump 16 is connected to a water outlet pipe 17, and the setting of the water pump 16 plays a role in pumping water;

[0027] In this embodiment, specifically: the right side of the steam container 4 is connected with a steam inlet pipe 18;

[0028] In this embodiment, specifically: a hose 19 is embedded inside the connecting plate 11, and the bottom ends of the two hoses 19 extend outside the connecting plate 11 and are respectively connected to the water outlet pipe 17 and the steam inlet pipe 18;

[0029] In this embodiment, specifically: the bottom of the fixing frame 2 is fixedly connected to the top of the bottom plate 1 through four supporting legs 20 .

[0030] The utility model is in operation: when in use, the water pump 16 pumps the water in the water tank 3 into the heat collecting tube 8. After the sunlight is irradiated on the multiple groups of strip reflectors 5, it is reflected to the double-arc reflector 7, and then refracted on the heat collecting tube 8 by the double-arc reflector 7, so that the water in the heat collecting tube 8 is heated to form water vapor, and then enters the steam container 4 through the hose 19 and the steam inlet pipe 18. When the angle of sunlight changes, the output shaft of the motor 15 drives the worm 14 to rotate, the worm 14 drives the worm wheel 12 to rotate, and the worm wheel 12 drives the connecting plate 11 to rotate through the round rod 10, thereby driving the double-arc reflector 7 and the heat collecting tube 8 to rotate, thereby increasing the receiving area of ​​sunlight and improving the solar energy conversion efficiency.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cavity absorber based on a linear Fresnel solar collector, comprising a bottom plate (1), characterized in that: A fixing frame (2), a water tank (3) and a steam container (4) are arranged on the top of the bottom plate (1); a plurality of strip-shaped reflectors (5) are rotatably connected between the left and right sides of the fixing frame (2) via a reflector damping shaft (6); both ends of the reflector damping shaft (6) extend outside the fixing frame (2) for easy manual operation; two support plates (9) are fixedly connected to the top of the fixing frame (2); a double-arc reflector (7) and a heat collecting tube (8) are arranged between the two support plates (9); the double-arc reflector (7) and the heat collecting tube (8) are connected to the fixing frame (2); 8) are fixedly connected with connecting plates (11) on both sides, and a round rod (10) is fixedly connected to the side of the two connecting plates (11) away from each other, and the round rod (10) is rotatably connected to the support plate (9) through a bearing, and the right end of one of the round rods (10) on the right side extends outside the support plate (9) and is fixedly connected to a worm gear (12), and the right side of the support plate (9) on the right side is fixedly connected with two rectangular plates (13), and a worm (14) is rotatably connected between the two rectangular plates (13), and the worm (14) is meshed with the worm gear (12).

2. The cavity absorber based on a linear Fresnel solar collector according to claim 1, characterized in that: The round rod (10) and the heat collecting tube (8) are located on the same axial line.

3. The cavity absorber based on a linear Fresnel solar collector according to claim 2, characterized in that: A motor (15) is fixedly connected to the rear side of the rear rectangular plate (13), and the output shaft end of the motor (15) is fixedly connected to the rear end of the worm (14).

4. The cavity absorber based on a linear Fresnel solar collector according to claim 3, characterized in that: A water pump (16) is fixedly connected to the top of the water tank (3); a water inlet of the water pump (16) extends into the water tank (3); and a water outlet of the water pump (16) is connected to a water outlet pipe (17).

5. The cavity absorber based on a linear Fresnel solar collector according to claim 4, characterized in that: The right side of the steam container (4) is connected to a steam inlet pipe (18).

6. The cavity absorber based on a linear Fresnel solar collector according to claim 5, characterized in that: A hose (19) is embedded inside the connecting plate (11), and the bottom ends of the two hoses (19) extend outside the connecting plate (11) and are respectively connected to the water outlet pipe (17) and the steam inlet pipe (18).

7. The cavity absorber based on a linear Fresnel solar collector according to claim 6, characterized in that: The bottom of the fixing frame (2) is fixedly connected to the top of the base plate (1) via four supporting legs (20).

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