A frame for a photovoltaic module

Abstract

The application discloses a kind of frames for photovoltaic module, it is related to solar photovoltaic power generation technical field, including photovoltaic panel and frame, the photovoltaic panel includes photovoltaic panel front and photovoltaic panel back, the frame includes upper frame, left frame, right frame and lower frame, the frame inside is provided with control part and passage, the control part is set in the middle position inside lower frame, the control part includes first cavity and the slider of being set in first cavity inside, the outer contour surface of slider is matched with the inner contour surface of first cavity, the first cavity is equipped with front opening, rear opening and lower opening, the passage includes first passage and second passage, this frame for photovoltaic module, cleaning pipeline and control part are arranged in the frame inside, can effectively resist the damage of harsh natural environment to cleaning pipeline and control part, and the front and back of photovoltaic module are cleaned, facilitate, it is favorable to improve power generation efficiency, reduce power generation cost.

Description

Technical Field

[0001] This invention relates to the field of solar photovoltaic power generation technology, specifically to a frame for photovoltaic modules. Background Technology

[0002] Photovoltaic modules, also known as solar panels, are one of the core components of a photovoltaic power generation system. Their main function is to convert solar energy into electrical energy, which can be stored in batteries or used to power loads. Photovoltaic modules are mainly composed of tempered glass, EVA, solar cells, TPT backsheets, and frames, and are characterized by long service life and strong mechanical resistance to external pressure.

[0003] Currently, photovoltaic (PV) module cleaning devices are typically installed outside the frame. The drawback of this installation method is that when PV modules are exposed to harsh natural environments, the pipes and valves of the cleaning device age faster, leading to shorter replacement cycles and increased power generation costs. Furthermore, existing cleaning devices usually only clean the front of the PV module, neglecting or failing to clean the back in an efficient and economical manner. The back of the PV module often accumulates dust due to electrostatic attraction and other factors. For single-sided PV modules, dust accumulation on the back affects heat dissipation, increasing the panel temperature and reducing power generation efficiency. For bifacial PV modules, dust accumulation further reduces transmittance, directly lowering power generation efficiency. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a frame for photovoltaic modules, which solves the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a frame for a photovoltaic module, comprising a photovoltaic panel and a frame, wherein the photovoltaic panel includes a front side and a back side, and the frame includes an upper frame, a left frame, a right frame and a lower frame, and the frame is provided with a control unit and a channel inside;

[0006] The control unit is located in the middle of the lower frame. The control unit includes a first cavity and a slider disposed inside the first cavity. The outer contour surface of the slider corresponds to and fits with the inner contour surface of the first cavity. The first cavity is provided with a front opening, a rear opening and a lower opening.

[0007] The channel includes a first channel and a second channel. The first channel includes a third cavity disposed inside the lower frame and communicating with the front opening, a fifth cavity disposed inside the right frame, a seventh cavity disposed inside the upper frame, a first row of holes, and a first slit. The third cavity, the fifth cavity, the seventh cavity, the first row of holes, and the first slit are interconnected.

[0008] The second channel includes a fourth cavity disposed inside the lower frame and communicating with the rear opening, a sixth cavity disposed inside the left frame, an eighth cavity disposed inside the upper frame, a second row of holes, and a second slit, wherein the fourth cavity, the sixth cavity, the eighth cavity, the second row of holes, and the second slit are interconnected.

[0009] Preferably, the first cavity further includes a first middle section and first constriction sections located on both sides of the first middle section, the front opening and the rear opening are respectively located at the end of the first constriction section, and the lower opening is located below the middle of the first middle section.

[0010] Preferably, the axis of the first cavity is the line connecting the center points of the front opening and the rear opening, and the axis is perpendicular to the front and back of the photovoltaic panel. The front opening is closer to the front of the photovoltaic panel, the rear opening is closer to the back of the photovoltaic panel, and the lower opening is connected to the cleaning system through a pipeline.

[0011] Preferably, the first channel and the second channel are centrally symmetrical in the cross-section of the frame, with the first channel located near the front side of the photovoltaic panel and the second channel located near the back side of the photovoltaic panel.

[0012] Preferably, the slider includes a second middle section and second contraction sections located on both sides of the second middle section. The outer contour surface of the second middle section corresponds to and engages with the inner contour surface of the first middle section. The outer contour surface of the second contraction section corresponds to and engages with the inner contour surface of the first contraction section. The minimum gap between the top surface of the outer contour surface of the second middle section and the top surface of the inner contour surface of the first middle section is 4-8mm.

[0013] Preferably, the slider has a second cavity inside, and the second cavity contains at least one solid ball. The axis of the second cavity is parallel to the axis of the first cavity, and the solid ball is a lead ball or a steel ball.

[0014] Preferably, the second cavity includes a third middle section and third contraction sections located on both sides of the third middle section. The inner contour surface of the second cavity is configured to cooperate with the outer contour surface of the solid sphere. The minimum gap between the top of the solid sphere and the top of the inner contour surface of the third middle section is 3-6 mm.

[0015] This invention provides a frame for photovoltaic modules. It has the following advantages:

[0016] The photovoltaic module frame, by housing the cleaning pipeline and control unit inside the frame, effectively resists damage to the cleaning pipeline and control unit caused by harsh natural environments, thus effectively extending the service life of the cleaning device. Furthermore, by using the corresponding fit between the outer contour surface of the slider and the inner contour surface of the first cavity, and by allowing the slider's center of gravity to shift, the contact or disengagement force between the second contraction section of the slider and the first contraction section of the first cavity is increased, which promotes slider movement and facilitates the formation or release of a seal between the slider and the first cavity. At the same time, this device can easily clean both sides of the photovoltaic panel. When applied to single-sided photovoltaic modules, it is beneficial for heat dissipation on the back side, improving power generation efficiency. When applied to bifacial photovoltaic modules, it is beneficial for improving the power generation efficiency on the back side of the bifacial photovoltaic module. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a photovoltaic module frame according to the present invention;

[0018] Figure 2 For the present invention Figure 1 AA view;

[0019] Figure 3 For the present invention Figure 1 BB view;

[0020] Figure 4 For the present invention Figure 1 CC view;

[0021] Figure 5 For the present invention Figure 1 A magnified view of a section at point S in the middle;

[0022] Figure 6 This invention is based on Figure 5 A schematic diagram of a photovoltaic module tilted towards the sky.

[0023] Figure 7 This invention is based on Figure 5 A schematic diagram of a photovoltaic module with its back tilted towards the sky;

[0024] Figure 8 For the present invention Figure 6 DD view.

[0025] In the diagram: 1. First cavity; 11. First middle section; 12. First contraction section; 1a. Front opening; 1b. Rear opening; 1c. Lower opening; 2. Slider; 3. Third cavity; 4. Fourth cavity; 5. Fifth cavity; 6. Sixth cavity; 7. Seventh cavity; 71. First row of holes; 72. First slit; 8. Eighth cavity; 81. Second row of holes; 82. Second slit; 9. Frame; 91. Upper frame; 92. Left frame; 93. Right frame; 94. Lower frame; 95. Front of photovoltaic panel; 96. Back of photovoltaic panel; 9a. Control unit; 9b. First channel; 9c. Second channel; 13. Pipeline; 14. Axis; 20. Second cavity; 21. Second middle section; 22. Second contraction section; 23. Third middle section; 24. Third contraction section; 25. Solid sphere. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1

[0028] Please see Figures 1 to 8 As shown, the present invention provides a frame for a photovoltaic module, including a photovoltaic panel and a frame 9. The photovoltaic panel includes a front side 95 and a back side 96. The frame 9 includes an upper frame 91, a left frame 92, a right frame 93 and a lower frame 94. A control unit 9a and a channel are provided inside the frame 9.

[0029] The control unit 9a is located in the middle of the lower frame 94. The control unit 9a includes a first cavity 1 and a slider 2 disposed inside the first cavity 1. The outer contour surface of the slider 2 corresponds to and fits with the inner contour surface of the first cavity 1. The first cavity 1 is provided with a front opening 1a, a rear opening 1b and a lower opening 1c.

[0030] The channel includes a first channel 9b and a second channel 9c. The first channel 9b includes a third cavity 3 disposed inside the lower frame 94 and communicating with the front opening 1a, a fifth cavity 5 disposed inside the right frame 93, a seventh cavity 7 disposed inside the upper frame 91, a first row of holes 71, and a first slit 72. The third cavity 3, the fifth cavity 5, the seventh cavity 7, the first row of holes 71, and the first slit 72 are interconnected.

[0031] The second channel 9c includes a fourth cavity 4 disposed inside the lower frame 94 and communicating with the rear opening 1b, a sixth cavity 6 disposed inside the left frame 92, an eighth cavity 8 disposed inside the upper frame 91, a second row of holes 81 and a second slit 82, and the fourth cavity 4, the sixth cavity 6, the eighth cavity 8, the second row of holes 81 and the second slit 82 are connected to each other.

[0032] The first cavity 1 also includes a first middle section 11 and a first contraction section 12 located on both sides of the first middle section 11. The front opening 1a and the rear opening 1b are respectively located at the end of the first contraction section 12, and the lower opening 1c is located below the middle of the first middle section 11.

[0033] The axis 14 of the first cavity 1 is the line connecting the center points of the front opening 1a and the rear opening 1b, and the axis 14 is perpendicular to the front 95 and the back 96 of the photovoltaic panel. The front opening 1a is close to the side of the front 95 of the photovoltaic panel, the rear opening 1b is close to the side of the back 96 of the photovoltaic panel, and the lower opening 1c is connected to the cleaning system through the pipe 13.

[0034] The first channel 9b and the second channel 9c are centrally symmetrical in the cross-section of the frame 9. The first channel 9b is closer to the front side 95 of the photovoltaic panel, and the second channel 9c is closer to the back side 96 of the photovoltaic panel.

[0035] The frame 9 is equipped with a motor-driven bracket. The bracket and the cleaning system are controlled by a control system. The control system includes a clock module, a sunrise and sunset time storage module, a calculation and selection module, a motor control module, a motor, and a mechanism to drive the frame to rotate. The above-mentioned modules, bracket, and cleaning system are all existing technologies and can be easily obtained by those skilled in the industry from existing mature technologies. They will not be described in detail here and are not shown in the figure. During operation, the calculation and selection module determines the output of the motor control module based on the data provided by the clock module and the sunrise and sunset time storage module, and manipulates the motor-driven bracket to rotate the frame so that the front of the photovoltaic panel faces the sky or the back of the photovoltaic panel faces the sky, and manipulates the opening and closing of the cleaning system.

[0036] In this embodiment, the lower port of the first channel 9b is the left port of the third cavity 3 and is connected to the front opening 1a; the lower port of the second channel 9c is the right port of the fourth cavity 4 and is connected to the rear opening 1b.

[0037] In this embodiment, the upper port of the first channel 9b is the lower port of the first slit 72, and it is tilted towards the front 95 of the photovoltaic panel; the upper port of the second channel 9c is the lower port of the second slit 82, and it is tilted towards the back 96 of the photovoltaic panel.

[0038] In this embodiment, when the frame 9 rotates to tilt the photovoltaic panel toward the sky, the slider 2 slides to a lower position along the axis 14 of the first cavity 1, blocking the rear opening 1b and connecting the lower opening 1c with the front opening 1a and the first channel 9b, or blocking the front opening 1a and connecting the lower opening 1c with the rear opening 1b and the second channel 9c.

[0039] In this embodiment, the cross-section of the first cavity 1 perpendicular to its axis 14 is rectangular, wherein the cross-section of the first contraction section 12 gradually contracts, ending at the front opening 1a and the rear opening 1b; the flow cross-sections of the third cavity 3, the fifth cavity 5, the seventh cavity 7, the fourth cavity 4, the sixth cavity 6, and the eighth cavity 8 are all rectangular; the first row of holes 71 and the second row of holes 81 are both a set of circular holes, which are evenly distributed on the sidewalls of the seventh cavity 7 and the eighth cavity 8; the first slit 72 and the second slit 82 are of the same length as the seventh cavity 7 and the eighth cavity 8.

[0040] Example 2

[0041] Based on Example 1, please refer to Figures 5 to 7 As shown, the specific improvements are as follows: The slider 2 includes a second middle section 21 and second contraction sections 22 located on both sides of the second middle section 21. The outer contour surface of the second middle section 21 corresponds to and fits with the inner contour surface of the first middle section 11. The outer contour surface of the second contraction section 22 corresponds to and fits with the inner contour surface of the first contraction section 12. The minimum gap between the top surface of the outer contour surface of the second middle section 21 and the top surface of the inner contour surface of the first middle section 11 is 4-8mm.

[0042] The slider 2 has a second cavity 20 inside, and the second cavity 20 has at least one solid ball 25 inside. The total volume of the solid ball 25 accounts for 40%-60% of the volume of the second cavity 20. The axis of the second cavity 20 is parallel to the axis 14 of the first cavity 1. The solid ball 25 is a lead ball or a steel ball.

[0043] The second cavity 20 includes a third middle section 23 and a third contraction section 24 located on both sides of the third middle section 23. The inner contour surface of the second cavity 20 is matched with the outer contour surface of the solid sphere 25. The minimum gap between the top of the solid sphere 25 and the top of the inner contour surface of the third middle section 23 is 3-6mm.

[0044] In this embodiment, when the frame 9 rotates to tilt the front or back of the photovoltaic panel toward the sky, the slider 2 slides to the lowest position of the first cavity 1. At this time, the outer contour surface of the second contraction section 22 of the slider 2 and the inner contour surface of the first contraction section 12 of the first cavity 1 form a mating surface, and the two form a seal at the contact point, thereby blocking the rear opening 1b or blocking the front opening 1a.

[0045] In this embodiment, when the frame 9 rotates and tilts the photovoltaic panel, the solid ball 25 rolls to the lowest position in the second cavity 20, causing the center of gravity of the slider 2 to shift to the lower position.

[0046] In this embodiment, the cross-sections of the second middle section 21 and the second contraction section 22 perpendicular to the axis 14 of the first cavity 1 are also rectangular, wherein the cross-section of the second contraction section 22 gradually contracts to the vertex where its outer contour surface intersects; at the same time, the outer contour surface of the second middle section 21 corresponds to and fits with the inner contour surface of the first middle section 11, and the outer contour surface of the second contraction section 22 corresponds to and fits with the inner contour surface of the first contraction section 12; wherein the minimum gap between the top surface of the outer contour surface of the second middle section 21 and the top surface of the inner contour surface of the first middle section 11 is 5mm; at the same time, the cross-sections of the third middle section 23 and the third contraction section 24 perpendicular to the axis 14 of the first cavity 1 are circular, wherein the cross-sectional area of ​​the third contraction section 24 is a circle that gradually contracts to zero; three solid spheres are set in the second cavity 20, the solid spheres are lead spheres, the total volume of the solid spheres occupies 50% of the volume of the second cavity, and the minimum gap between the top of the solid sphere 25 and the top of the inner contour surface of the third middle section 23 is 3mm;

[0047] The above structure, by having the outer contour surface of the slider 2 correspond and cooperate with the inner contour surface of the first cavity 1 and the center of gravity of the slider 2 can be shifted, increases the contact or separation force between the second contraction section 22 of the slider 2 and the first contraction section 12 of the first cavity 1, which can promote the movement of the slider 2 and the formation or release of a seal between the slider 2 and the first cavity 1.

[0048] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0049] Working principle: S1, during the sunrise to sunset period, such as Figure 6 , Figure 8 As shown, the front of the photovoltaic panel is tilted 95 degrees towards the sky and tracks the sun to generate electricity. The slider 2 slides down to the lowest position on the left side under the action of the solid ball 25, blocking the rear opening 1b and connecting the lower opening 1c with the front opening 1a and the first channel 9b.

[0050] S2: Within 0-3 minutes after sunset, such as Figure 6 As shown, the control system rotates the frame 9 so that the front of the photovoltaic panel 95 is still tilted towards the sky, but the angle α between the front of the photovoltaic panel 95 and the vertical line is controlled within the range of 5°-15° (at this time, the control unit 9a is still in the state of the rear opening 1b being blocked, the lower opening 1c and the front opening 1a and the first channel 9b being connected). Then the cleaning system is started, and the cleaning water is input into the control unit 9a from the pipe 13 and the lower opening 1c, and then flows out through the front opening 1a, the third cavity 3, the fifth cavity 5, the seventh cavity 7, the first row of holes 71 and the first slit 72 to clean the front of the photovoltaic panel 95.

[0051] In this step, the angle α between the front 95 of the photovoltaic panel and the vertical line is controlled within the range of 5°-15°, which helps to use the gravity of the cleaning water to make the dirt flow down and get off the front 95 of the photovoltaic panel as soon as possible.

[0052] S3, within 4 minutes after sunset to 6 minutes before sunrise, such as Figure 7 As shown, the control system controls the frame 9 to continue rotating, tilting the back of the photovoltaic panel 96 toward the sky, and controlling the angle β between the back of the photovoltaic panel 96 and the vertical line within the range of 5°-15°.

[0053] In this step, the orientation change of the photovoltaic panel has three stages: the front of the photovoltaic panel is tilted 95 degrees towards the sky, the front of the photovoltaic panel is perpendicular to the horizontal plane, and the back of the photovoltaic panel is tilted 96 degrees towards the sky. During the transition from the second stage to the third stage, as follows... Figure 7 As shown, the solid ball 25 rolls within the second cavity 20 to its lowest position near the front opening 1a, thereby shifting the center of gravity of the slider 2 towards the front opening 1a. This increases the force at which the slider 2 (second contraction section 22) at the rear opening 1b disengages from the first cavity 1 (first contraction section 12), promoting the slider 2's disengagement from the rear opening 1b. Simultaneously, the shift in the center of gravity of the slider 2 also increases the speed at which the slider 2 moves towards the front opening 1a, which helps to increase the contact force between the slider 2 (second contraction section 22) and the first cavity 1 (first contraction section 12), promoting the formation of a seal between them. At the end of this step, the control unit 9a is in a state where the front opening 1a is blocked, and the lower opening 1c, rear opening 1b, and second channel 9c are connected.

[0054] S4. 6-3 minutes before sunrise, the control system starts the cleaning system and inputs the cleaning water into the control unit 9a from the pipe 13 and the lower opening 1c, and then flows out through the rear opening 1b, the fourth cavity 4, the sixth cavity 6, the eighth cavity 8, the second row of holes 81 and the second slit 82 to clean the back of the photovoltaic panel 96.

[0055] In this step, the angle β between the back of the photovoltaic panel 96 and the vertical line is controlled within the range of 5°-15°. This can reduce the vertical projection area of ​​the back, which is beneficial to reduce the accumulation of dust on the back and to make the dirt flow down and leave the back of the photovoltaic panel 96 as soon as possible by using the gravity of the cleaning water.

[0056] S5. 3-0 minutes before sunrise, the controller controls the frame 9 to rotate in the opposite direction, so that the front of the photovoltaic panel 95 is tilted towards the sky again, and the above process is repeated according to step S1.

[0057] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A frame for a photovoltaic module, comprising a photovoltaic panel and a frame (9), the photovoltaic panel comprising a photovoltaic panel front face (95) and a photovoltaic panel back face (96), the frame (9) comprising an upper frame (91), a left frame (92), a right frame (93) and a lower frame (94), characterized in that: The frame (9) is internally provided with a control part (9a) and a channel; The control part (9a) is arranged at the middle position inside the lower frame (94), the control part (9a) comprises a first cavity (1) and a sliding block (2) arranged inside the first cavity (1), the outer contour surface of the sliding block (2) is correspondingly matched with the inner contour surface of the first cavity (1), the first cavity (1) is provided with a front opening (1a), a rear opening (1b) and a lower opening (1c); The channel comprises a first channel (9b) and a second channel (9c), the first channel (9b) comprises a third cavity (3) arranged inside the lower frame (94) and communicated with the front opening (1a), a fifth cavity (5) arranged inside the right frame (93), a seventh cavity (7) arranged inside the upper frame (91), a first row of holes (71) and a first slit (72), the third cavity (3), the fifth cavity (5), the seventh cavity (7), the first row of holes (71) and the first slit (72) are communicated with each other; The second channel (9c) comprises a fourth cavity (4) arranged inside the lower frame (94) and communicated with the rear opening (1b), a sixth cavity (6) arranged inside the left frame (92), an eighth cavity (8) arranged inside the upper frame (91), a second row of holes (81) and a second slit (82), the fourth cavity (4), the sixth cavity (6), the eighth cavity (8), the second row of holes (81) and the second slit (82) are communicated with each other.

2. A frame for a photovoltaic module according to claim 1, wherein: The first cavity (1) further comprises a first middle section (11) and a first contraction section (12) located on both sides of the first middle section (11), the front opening (1a) and the rear opening (1b) are respectively arranged at the ends of the first contraction section (12), and the lower opening (1c) is arranged below the middle part of the first middle section (11).

3. The frame for a photovoltaic module according to claim 1, wherein: The axis (14) of the first cavity (1) is a line connecting the center points of the front opening (1a) and the rear opening (1b), and the axis (14) is perpendicular to the front surface (95) and the back surface (96) of the photovoltaic panel, the front opening (1a) is close to one side of the front surface (95) of the photovoltaic panel, the rear opening (1b) is close to one side of the back surface (96) of the photovoltaic panel, and the lower opening (1c) is communicated with the cleaning system through a pipeline (13).

4. The frame for a photovoltaic module according to claim 1, wherein: The first channel (9b) and the second channel (9c) are center-symmetrical in the cross section of the frame (9), the first channel (9b) is close to one side of the front surface (95) of the photovoltaic panel, and the second channel (9c) is close to one side of the back surface (96) of the photovoltaic panel.

5. The frame for a photovoltaic module according to claim 1, wherein: The sliding block (2) comprises a second middle section (21) and a second contraction section (22) located on both sides of the second middle section (21), the outer contour surface of the second middle section (21) is correspondingly matched with the inner contour surface of the first middle section (11), the outer contour surface of the second contraction section (22) is correspondingly matched with the inner contour surface of the first contraction section (12), and the minimum gap between the top surface of the outer contour surface of the second middle section (21) and the top surface of the inner contour surface of the first middle section (11) is 4-8 mm.

6. The frame for a photovoltaic module according to claim 1, wherein: The inside of the slider (2) is provided with a second cavity (20), and at least one solid ball (25) is arranged in the second cavity (20), the axis of the second cavity (20) is parallel to the axis (14) of the first cavity (1), and the solid ball (25) is a lead ball or a steel ball.

7. A frame for a photovoltaic module according to claim 6, wherein: The second cavity (20) comprises a third middle section (23) and third contraction sections (24) located on both sides of the third middle section (23), the inner contour surface of the second cavity (20) is matched with the outer contour surface of the solid ball (25), and the minimum gap between the top end of the solid ball (25) and the top end of the inner contour surface of the third middle section (23) is 3-6 mm.

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