A heat dissipation device for a photovoltaic power generation panel

Abstract

The application relates to the technical field of photovoltaic panels, in particular to a heat dissipation device of a photovoltaic panel, which comprises a photovoltaic panel, a mounting frame fixedly connected to the bottom of the photovoltaic panel, a heat exchange frame slidingly connected to the mounting frame, a recooling frame slidingly connected to the mounting frame, the recooling frame being fixed with the heat exchange frame and the space between the heat exchange frame and the recooling frame being communicated, the space in the recooling frame adopting a high surface-to-volume ratio structure, a cooling device fixedly arranged on the recooling frame and arranged on the side of the maximum surface area of the recooling frame, and a driving assembly arranged on the mounting frame and fixed with the heat exchange frame and the recooling frame. The application uses the liquid cooling method to perform heat exchange on the photovoltaic panel, uses the liquid heat exchange medium with higher specific heat capacity than air flow, improves the heat absorption capacity, uses the cooling device to continuously recold the heat exchange medium, ensures excellent heat dissipation performance, reduces the generation of dust, and improves the long-term operation stability and economy of the photovoltaic panel.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of photovoltaic panels, in particular to a heat dissipation device for photovoltaic panels. BACKGROUND

[0002] Photovoltaic power generation is a technology that converts light energy into electricity by using the photovoltaic effect of the semiconductor interface. It has the advantages of being clean, renewable, and widely distributed. It is of great significance to promote energy structure transformation and reduce carbon emissions. With the rapid development of photovoltaic technology, photovoltaic power generation has been widely used in industrial, agricultural, commercial and residential electricity fields, and has become an important part of the global energy system.

[0003] However, the surface temperature of the photovoltaic panel will rise significantly under long-term work or exposure to sunlight, resulting in a decrease in power generation efficiency. In addition, high temperature can also accelerate the aging of photovoltaic components and shorten their service life. Therefore, in order to improve the stability and efficiency of the photovoltaic power generation system, a heat dissipation means is usually used to cool the photovoltaic panel.

[0004] At present, the common heat dissipation method is air cooling, that is, using a fan to control the flow of air to carry away the heat on the surface of the photovoltaic panel. However, high-speed airflow can easily lift dust from the ground or the surrounding environment, causing it to adhere to the surface of the photovoltaic panel. Over time, dust accumulates and may become hardened, forming a layer of dirt that is difficult to remove, which severely blocks the light receiving area of the photovoltaic panel, thereby reducing the power generation efficiency. In addition, frequent cleaning and maintenance will increase maintenance costs. SUMMARY

[0005] The present application provides a heat dissipation device for photovoltaic panels that can efficiently dissipate heat and reduce dust pollution, in order to improve the long-term operation stability and economy of photovoltaic panels.

[0006] The technical implementation of the present application is: a heat dissipation device for a photovoltaic panel, comprising a photovoltaic panel; a mounting bracket fixedly connected to the bottom of the photovoltaic panel; a heat exchange frame slidingly connected to the mounting bracket, the heat exchange frame moving linearly in the horizontal direction, the transverse dimension of the heat exchange frame being consistent with the width of the photovoltaic panel, and the longitudinal displacement stroke of the heat exchange frame being equal to the length of the photovoltaic panel; a recooling frame slidingly connected to the mounting bracket, the recooling frame being fixed with the heat exchange frame and the space between them being communicated, the space in the recooling frame adopting a high surface area structure; a cooling device fixedly arranged on the recooling frame, the cooling device being arranged on the side of the recooling frame with the maximum surface area; and a driving assembly arranged on the mounting bracket, the driving assembly being fixed with the heat exchange frame and the recooling frame.

[0007] Optionally, the lower surface of the photovoltaic panel is provided with regularly arranged concave-convex surfaces; the profile of the heat exchange frame is complementary to the concave-convex surfaces and is in contact with the concave-convex surfaces at all times during displacement.

[0008] Optionally, the device further comprises: mounting frames fixedly connected to the two sides of the recooling frame respectively; impellers rotatably connected in the mounting frames; a transmission shaft rotatably arranged on the recooling frame, the transmission shaft being connected with the impellers; a first servo motor fixedly connected to the outer wall of the recooling frame; a driving gear fixedly connected to the output end of the first servo motor; and a driven gear arranged in the recooling frame and connected with the transmission shaft, the driven gear being engaged with the driving gear.

[0009] Optionally, the transmission shaft is axially displaceable relative to the recooling frame; the blades of the impellers on the two sides are opposite to each other; the device further comprises: a mounting block fixedly connected to the recooling frame, the driven gear being rotatably connected to the mounting block; a spline arranged on the transmission shaft, the driven gear being keyed to the transmission shaft through the spline; plug blocks fixedly connected to the two ends of the transmission shaft, the plug blocks being arranged in a circle around the circumference of the transmission shaft; shaft sleeves fixedly connected to the two impellers respectively, the shaft sleeves being coaxially fixed to the impellers, the inner walls of the shaft sleeves being provided with plug grooves engaged with the plug blocks, only one of the plug blocks on the transmission shaft being engaged with the corresponding shaft sleeve; and a control assembly arranged on the mounting frame.

[0010] Optionally, two sets of control assemblies are arranged on the mounting frame, the control assemblies being arranged on the two sides of the mounting frame respectively; the control assembly comprises: a guide groove fixedly connected to the mounting frame, the guide groove being provided with inner and outer guide surfaces; a guide block fixedly connected to the mounting frame, the guide block being arranged on one side of the guide groove, the guide blocks of the two sets of control assemblies being arranged on different sides of the guide groove respectively, the guide block being provided with a slope on the side close to the guide groove, one end of the slope being on the same straight line as the inner guide surface of the guide groove; a partition plate rotatably connected to the guide groove; a reset torsion spring fixedly connected between the guide groove and the partition plate, the reset torsion spring allowing the partition plate to abut against the other end of the slope of the guide block, at this time, the partition plate is on the same straight line as the outer guide surface of the guide groove and the other end of the slope; contact blocks rotatably connected to the two ends of the transmission shaft, the contact blocks being matched with the guide groove and the guide block, the contact blocks being connected to the transmission shaft through bearings.

[0011] Optionally, the driving assembly comprises: reciprocating screws rotatably connected to the two sides of the mounting frame, the reciprocating screws being threadedly engaged with the heat exchange frame and the recooling frame; a second servo motor fixedly connected to the mounting frame, the output end of the second servo motor being fixed to one of the reciprocating screws; and a synchronous belt set arranged between the two sets of reciprocating screws.

[0012] Optionally, the cooling device comprises: a support frame fixedly connected to the recooling frame; a fan blade rotatably connected to the support frame; and two transmission bevel gears rotatably connected to the support frame, the two transmission bevel gears being engaged with each other, one of the transmission bevel gears being coaxially fixed to the fan blade, and the other transmission bevel gear being keyed to the transmission shaft through a spline.

[0013] Optionally, the device further comprises: fins fixedly connected to the recooling frame.

[0014] The present application has the following advantages: the present application uses liquid cooling method to heat the photovoltaic panel, by using liquid heat exchange medium with higher specific heat capacity than air flow, the heat absorption capacity is improved, and the cooling device is used to continuously cool the heat exchange medium, which reduces the generation of dust and improves the long-term operation stability and economy of the photovoltaic panel. The present application uses impeller to promote the circulation of heat exchange medium, effectively strengthens the heat transfer process, and improves the heat exchange efficiency of heat exchange medium and photovoltaic panel. The present application uses the reciprocating displacement of transmission shaft to automatically realize the axial displacement of transmission shaft, avoids the temperature gradient caused by one-way flow of heat exchange medium, and makes the heat dissipation of the whole photovoltaic panel surface more uniform and stable. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0016] Figure 2 It is a structure separation diagram of the photovoltaic panel in the present application.

[0017] Figure 3 It is a schematic diagram of the connection structure of the heat exchange frame, the recooling frame and the cooling device in the present application.

[0018] Figure 4 It is a structure sectional view of the heat exchange frame and the recooling frame in the present application.

[0019] Figure 5 It is a connection structure sectional view of the circulating assembly in the recooling frame in the present application.

[0020] Figure 6 It is a connection structure separation diagram of the circulating assembly and the reversing assembly in the present application.

[0021] Figure 7 It is a position structure sectional view of the control assembly on the mounting frame in the present application.

[0022] Figure 8 It is a connection structure schematic diagram of the control assembly in the present application.

[0023] Figure 9 It is a connection structure schematic diagram of the driving assembly in the present application.

[0024] Figure 10 It is a connection structure schematic diagram of the cooling device in the present application.

[0025] The labels of the components in the drawings are as follows: 101: photovoltaic panel, 102: mounting frame, 103: heat exchange frame, 104: recooling frame, 105: cooling device, 1501: support frame, 1502: fan blade, 1503: transmission bevel gear, 106: concave-convex surface, 107: fin, 201: mounting frame, 202: impeller, 203: transmission shaft, 204: first servo motor, 205: driving gear, 206: driven gear, 301: mounting block, 302: spline, 303: plug-in block, 304: shaft sleeve, 401: guide groove, 402: guide block, 403: partition plate, 404: reset torsional spring, 405: contact block, 501: reciprocating screw, 502: second servo motor, 503: synchronous belt set. DETAILED DESCRIPTION

[0026] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings. It is hereby declared that the up, down, left, right, front, back, inner and outer directions appearing or about to appear in the present application are based on the drawings of the present application, and are not specific limitations on the present application.

[0027] Embodiment: A heat dissipation device of a photovoltaic panel, in combination with Figures 1-4 As shown in the drawings, the heat dissipation device comprises: a photovoltaic panel 101, the lower surface of the photovoltaic panel 101 is provided with regularly arranged concave-convex surfaces 106, which are used to expand the heat exchange area of the photovoltaic panel 101 and improve the heat conduction efficiency; a mounting frame 102 fixedly installed at the bottom of the photovoltaic panel 101; a heat exchange frame 103 slidingly installed on the mounting frame 102, which moves in a reciprocating straight line along the horizontal direction, and in this embodiment, the specific direction is the front-back direction, the transverse dimension of the heat exchange frame 103 is consistent with the width of the photovoltaic panel 101, specifically, the left-right direction, and the longitudinal displacement stroke is equal to the length of the photovoltaic panel 101, specifically, the front-back direction, so that the scanning area of the heat exchange frame 103 covers the lower surface area of the photovoltaic panel 101, the profile of the heat exchange frame 103 is complementary to the concave-convex surfaces 106, and it always keeps contact with the concave-convex surfaces 106 of the lower surface of the photovoltaic panel 101 during displacement; a recooling frame 104 slidingly installed on the mounting frame 102, which is fixed with the heat exchange frame 103 and the space therebetween is communicated to form an integrated flow channel, the heat exchange medium is arranged in the integrated flow channel, and the space in the recooling frame 104 adopts a high surface area structure to expand the effective heat exchange area on one side; a cooling device 105 fixedly arranged on the recooling frame 104, which is arranged on the side of the largest surface area of the recooling frame 104; fins 107 fixedly installed on the recooling frame 104, which are used to further expand the heat exchange area of the recooling frame 104; and a driving assembly arranged on the mounting frame 102, which is fixed with the heat exchange frame 103 and the recooling frame 104 to drive the reciprocating left-right displacement of the two.

[0028] The driving assembly and the cooling device 105 are started to run, the driving assembly controls the heat exchange frame 103 and the re-cooling frame 104 to move back and forth along the length direction of the photovoltaic panel 101, that is, the front and back direction, in the process, the heat exchange frame 103 keeps in contact with the concave-convex surface 106 of the photovoltaic panel 101, and the heat exchange medium absorbs the heat of the photovoltaic panel 101 to achieve the purpose of cooling the photovoltaic panel 101, at the same time, the temperature of the heat exchange medium rises after absorbing the heat; the cooling device 105 runs to cool the heat exchange medium at the re-cooling frame 104, restores the heat absorption capacity of the heat exchange medium, and thus the cycle is repeated, so as to achieve the purpose of cooling the photovoltaic panel 101; in addition, the uniform displacement of the heat exchange frame 103 ensures the uniform contact with the photovoltaic panel 101, and ensures the uniformity of the cooling effect.

[0029] In combination with Figure 5 As shown in the figure, the device further comprises a circulating assembly arranged between the heat exchange frame 103 and the re-cooling frame 104, the circulating assembly drives the heat exchange medium to circulate to accelerate the heat exchange process, the circulating assembly comprises: installation frames 201 fixedly installed on the left and right sides in the re-cooling frame 104 respectively; an impeller 202 rotatably installed in the installation frame 201, the impeller 202 rotates to push the heat exchange medium to circulate in the re-cooling frame 104 and the heat exchange frame 103; a transmission shaft 203 rotatably arranged on the re-cooling frame 104, the transmission shaft 203 is connected with the impeller 202 to realize the rotary drive; a first servo motor 204 fixedly installed on the outer wall of the re-cooling frame 104; a driving gear 205 fixedly installed on the output end of the first servo motor 204; a driven gear 206 arranged in the re-cooling frame 104 and connected with the transmission shaft 203, the driven gear 206 is engaged with the driving gear 205.

[0030] At the same time of the reciprocating displacement of the heat exchange frame 103 and the re-cooling frame 104, the first servo motor 204 is started to run, through the engagement transmission of the driving gear 205 and the driven gear 206, the transmission shaft 203 is driven to rotate, and then the impeller 202 is driven to rotate, the impeller 202 generates a push flow effect to control the circulation of the heat exchange medium, accelerates the delivery speed of the heat exchange medium after being heated to the re-cooling frame 104, and promotes the rapid return flow of the heat exchange medium after being cooled to the heat exchange frame 103, so as to effectively strengthen the heat transfer process and improve the heat exchange efficiency of the heat exchange medium and the photovoltaic panel 101.

[0031] In combination with Figure 6As shown, the transmission shaft 203 can be axially displaced in the left-right direction relative to the recooling frame 104; the blades of the two impellers 202 are in opposite directions, and when the transmission shaft 203 drives the impellers 202 to rotate in the same direction, the two impellers 202 will respectively drive the heat exchange medium to circulate in opposite directions. The device further comprises a reversing assembly arranged in the recooling frame 104, which is used to convert the flow direction of the heat exchange medium, and the reversing assembly comprises: a mounting block 301 fixedly installed on the recooling frame 104, and the driven gear 206 is rotatably installed on the mounting block 301; the transmission shaft 203 is provided with a spline 302, and the driven gear 206 is keyed connected with the transmission shaft 203 through the spline 302, so as to ensure that the transmission shaft 203 can receive the rotary driving force from the first servo motor 204 before and after axial displacement; the transmission shaft 203 is provided with an insertion block 303 fixedly installed at both ends of the transmission shaft 203, and the insertion block 303 is arranged in a circle around the circumference of the transmission shaft 203; the transmission shaft 203 is provided with an axle sleeve 304 fixedly installed on each impeller 202, and the axle sleeve 304 is coaxially fixed with the impeller 202, and the inner wall of the axle sleeve 304 is provided with an insertion slot engaged with the insertion block 303; only one side of the transmission shaft 203 is provided with an insertion block 303 engaged with the corresponding axle sleeve 304, and when the transmission shaft 203 is axially displaced, the insertion block 303 on this side is disengaged from the corresponding axle sleeve 304, and the insertion block 303 on the other side is engaged with the corresponding axle sleeve 304, so as to realize the alternate driving of the two impellers 202; and the device is provided with a control assembly arranged on the mounting rack 102, which is used to drive the transmission shaft 203 to axially displace.

[0032] When the control assembly drives the transmission shaft 203 to move to the left side, the insertion block 303 on the left side is engaged with the corresponding axle sleeve 304, while the insertion block 303 on the right side is disengaged from the corresponding axle sleeve 304, so that when the first servo motor 204 drives the transmission shaft 203 to rotate, the left impeller 202 will be driven to work, and the heat exchange medium will form a clockwise circulating flow in the integrated flow channel; when the control assembly drives the transmission shaft 203 to displace to the right side, the insertion block 303 on the right side is engaged with the corresponding axle sleeve 304, while the insertion block 303 on the left side is disengaged from the corresponding axle sleeve 304, so that the right impeller 202 is driven to rotate, and the flow direction of the heat exchange medium is switched to counterclockwise. Therefore, when the heat exchange frame 103 and the recooling frame 104 complete the displacement from one side to the other side of the photovoltaic panel 101, the impellers 202 will be switched, the flow direction of the heat exchange medium will be alternately changed, and through this periodic flow direction change, the left and right sides of the photovoltaic panel 101 can be preferentially contacted with the low-temperature heat exchange medium, and the frequency is consistent, so as to avoid the temperature gradient caused by the unidirectional flow of the heat exchange medium, and make the heat dissipation of the entire photovoltaic panel 101 more uniform and stable.

[0033] In combination with Figure 7 and Figure 8As shown, two sets of control assemblies are arranged on the mounting frame 102, and the two sets of control assemblies are arranged on the left and right sides of the mounting frame 102; the control assembly comprises: a guide groove 401 fixedly installed on the mounting frame 102, the guide groove 401 is provided with inner and outer guide surfaces; a guide block 402 fixedly installed on the mounting frame 102, the guide block 402 is arranged on one side of the guide groove 401, the guide blocks 402 in the two sets of control assemblies are respectively arranged on different sides of the guide groove 401, and an inclined surface is arranged on one side of the guide block 402 close to the guide groove 401, one end of the inclined surface is in the same straight line as the inner guide surface of the guide groove 401; a partition plate 403 rotatably installed on the guide groove 401; a reset torsion spring 404 fixedly installed between the guide groove 401 and the partition plate 403, the reset torsion spring 404 makes the partition plate 403 tightly abut against the other end of the inclined surface of the guide block 402, at this time, the partition plate 403 is in the same straight line as the outer guide surface of the guide groove 401 and the other end of the inclined surface; a contact block 405 rotatably installed on the front and rear ends of the transmission shaft 203, the contact block 405 cooperates with the guide groove 401 and the guide block 402 to guide the axial displacement of the transmission shaft 203, and the contact block 405 is connected with the transmission shaft 203 through a bearing, so that when the guide groove 401 limits the contact block 405, the transmission shaft 203 can rotate smoothly without being affected by the contact block 405.

[0034] In the process of reciprocating displacement of the transmission shaft 203 with the complex cooling frame 104, when the contact block 405 on one side of the transmission shaft 203 is located on the inner guide surface of the guide groove 401 on the side, the contact block 405 on the opposite side will be located on the outer guide surface of the guide groove 401 on the opposite side. Taking a specific movement process as an example: in the initial state, the complex cooling frame 104 starts to reciprocate from the front side position, at this time the contact block 405 on the left side of the transmission shaft 203 is located on the outer guide surface of the left guide groove 401, and the contact block 405 on the right side is located on the inner guide surface of the right guide groove 401. As the transmission shaft 203 follows the complex cooling frame 104 to displace backward, the contact block 405 on the right side will move from the inner guide surface of the right guide groove 401 to the guide block 402, and the contact block 405 on the left side will be separated from the outer guide surface of the left guide groove 401. Then continue to move backward, the contact block 405 on the right side is pushed by the inclined surface of the guide block 402, so that the transmission shaft 203 as a whole displaces to the left, in the process, the contact block 405 on the right side of the transmission shaft 203 pushes the partition plate 403 to rotate, enters the straight line where the outer guide surface of the right guide groove 401 is located, the reset spring 404 resets the partition plate 403, and the contact block 405 on the left side enters the straight line where the inner guide surface of the left guide groove 401 is located. Therefore, when the transmission shaft 203 displaces forward, the contact block 405 on the right side enters the outer guide surface of the right guide groove 401 through the partition plate 403 on the right side, and the contact block 405 on the left side directly enters the inner guide surface of the left guide groove 401, until the transmission shaft 203 moves forward to the left side of the contact block 405 and the left guide block 402, the transmission shaft 203 is pushed to displace to the right side, the contact block 405 on the right side enters the straight line where the inner guide surface of the right guide groove 401 is located, and the contact block 405 on the left side enters the straight line where the outer guide surface of the guide groove 401 is located. As described above, through the mechanical cooperation between the reciprocating displacement of the transmission shaft 203 and the control assembly, the automatic control of the axial displacement of the transmission shaft 203 will be realized.

[0035] In combination Figure 9 As shown in the figure, the driving assembly includes: reciprocating screws 501 rotatably installed on the front and rear sides of the mounting frame 102, the reciprocating screws 501 are in threaded cooperation with the heat exchange frame 103 and the complex cooling frame 104; the second servo motor 502 is fixedly installed on the mounting frame 102, the output end of the second servo motor 502 is fixed with one of the reciprocating screws 501; the synchronous belt set 503 is arranged between the two groups of reciprocating screws 501 to realize synchronous transmission. Starting the second servo motor 502 will realize stable reciprocating displacement of the heat exchange frame 103 and the complex cooling frame 104.

[0036] In combination Figure 10As shown, five groups of cooling devices 105 are arranged on the recooling frame 104, and the cooling device 105 comprises a support frame 1501 fixedly installed on the recooling frame 104, a fan blade 1502 rotatably installed on the support frame 1501, and two transmission bevel gears 1503 rotatably installed on the support frame 1501, which are meshed with each other, one of the transmission bevel gears 1503 is coaxially fixed with the fan blade 1502, and the other transmission bevel gear 1503 is keyed with the transmission shaft 203 through the spline 302. When the transmission shaft 203 drives the impeller 202 to rotate and drives the heat exchange medium to run, the fan blade 1502 will also run synchronously to dissipate heat, so that the use of the cooling device 105 will realize the optimization of the structure to save energy consumption.

[0037] Although embodiments of the present application have been shown and described, it is to be understood that the application is not limited to these embodiments. Since modifications can be made in these embodiments without departing from the spirit and scope of the application, the application is not to be limited to the details shown, as these can be modified in various ways by those skilled in the art. The scope of the application is to be defined by the following claims and their equivalents.

Claims

1. A heat dissipating device for a photovoltaic panel, characterized in that, It includes: Photovoltaic panel (101); fixedly connected to the mounting bracket (102) at the bottom of the photovoltaic panel (101); the heat exchange frame (103) is slidably connected to the mounting bracket (102), the heat exchange frame (103) reciprocating linear motion along the horizontal direction, the transverse dimension of the heat exchange frame (103) is consistent with the width of the photovoltaic panel (101), and the longitudinal displacement stroke is equal to the length of the photovoltaic panel (101), so that the scanning area of the heat exchange frame (103) covers the lower surface area of the photovoltaic panel (101); the recooling frame (104) is slidably connected to the mounting bracket (102), the recooling frame (104) is fixed with the heat exchange frame (103) and the space between them is communicated to form an integrated flow channel, the heat exchange medium is arranged in the integrated flow channel, and the space in the recooling frame (104) adopts a high surface area structure to expand the effective heat exchange area on one side; the cooling device (105) is fixedly arranged on the recooling frame (104), and the cooling device (105) is arranged on the side of the maximum surface area of the recooling frame (104); the driving assembly is arranged on the mounting bracket (102), and the driving assembly is fixed with the heat exchange frame (103) and the recooling frame (104) to drive the reciprocating displacement of the heat exchange frame (103) and the recooling frame (104); The device further includes: the mounting frame (201) is fixedly connected to the two sides in the recooling frame (104) respectively; the impeller (202) is rotatably connected in the mounting frame (201), and the impeller (202) rotates to push the heat exchange medium to circulate in the recooling frame (104) and the heat exchange frame (103); the transmission shaft (203) is rotatably arranged on the recooling frame (104), and the transmission shaft (203) is connected with the impeller (202) to realize rotary driving; the first servo motor (204) is fixedly connected to the outer wall of the recooling frame (104); the driving gear (205) is fixedly connected to the output end of the first servo motor (204); the driven gear (206) is arranged in the recooling frame (104) and connected with the transmission shaft (203), and the driven gear (206) is engaged with the driving gear (205). The transmission shaft (203) can be axially displaced relative to the recooling frame (104); the blades of the impellers (202) on both sides are in opposite directions, when the transmission shaft (203) drives the impellers (202) to rotate in the same direction, the impellers (202) on both sides will drive the heat exchange medium to circulate in opposite directions respectively, the device further comprises: a mounting block (301) fixedly connected to the recooling frame (104), the driven gear (206) is rotatably connected to the mounting block (301); the transmission shaft (203) is provided with a spline (302), the driven gear (206) is keyed to the transmission shaft (203) through the spline (302); the insert blocks (303) are fixedly connected to both ends of the transmission shaft (203), the insert blocks (303) are arranged in a circle around the circumference of the transmission shaft (203); the shaft sleeves (304) are fixedly connected to the two impellers (202) respectively, the shaft sleeves (304) are coaxially fixed to the impellers (202), the inner walls of the shaft sleeves (304) are provided with insert grooves engaged with the insert blocks (303), only one side of the insert blocks (303) on the transmission shaft (203) is engaged with the corresponding shaft sleeve (304), when the transmission shaft (203) is axially displaced, the insert blocks (303) on the side will be disengaged from the corresponding shaft sleeve (304), the insert blocks (303) on the other side will be engaged with the corresponding shaft sleeve (304); the control assembly is arranged on the mounting rack (102), and the control assembly is used to drive the transmission shaft (203) to axially displace; There are two groups of control assemblies arranged on the mounting rack (102), and the control assemblies are arranged on the two sides of the mounting rack (102); the control assembly comprises: a guide groove (401) fixedly connected to the mounting rack (102), the guide groove (401) is provided with inner and outer guide surfaces; a guide block (402) fixedly connected to the mounting rack (102), the guide block (402) is arranged on one side of the guide groove (401), the guide blocks (402) in the two groups of control assemblies are arranged on different sides of the guide groove (401), the guide block (402) is provided with an inclined surface on the side close to the guide groove (401), one end of the inclined surface is in the same straight line with the inner guide surface of the guide groove (401); a partition plate (403) rotatably connected to the guide groove (401); a reset torsion spring (404) fixedly connected between the guide groove (401) and the partition plate (403), the reset torsion spring (404) makes the partition plate (403) tightly contact the other end of the inclined surface of the guide block (402), at this time, the partition plate (403) is in the same straight line with the outer guide surface of the guide groove (401) and the other end of the inclined surface; a contact block (405) rotatably connected to both ends of the transmission shaft (203), the contact block (405) cooperates with the guide groove (401) and the guide block (402) to guide the axial displacement of the transmission shaft (203), the contact block (405) is connected to the transmission shaft (203) through a bearing.

2. A heat dissipating device for a photovoltaic power panel according to claim 1, characterized in that, The lower surface of the photovoltaic panel (101) is provided with regularly arranged concave-convex surfaces (106) for expanding the heat exchange area of the photovoltaic panel (101); the profile of the heat exchange frame (103) is complementary matched with the concave-convex surfaces (106), and it is always in contact with the concave-convex surfaces (106) when it is displaced.

3. The heat dissipating device for photovoltaic power generation panel according to claim 1, wherein, The driving assembly comprises: reciprocating screws (501) rotatably connected on both sides of the mounting frame (102), the reciprocating screws (501) being threadedly matched with the heat exchange frame (103) and the recooling frame (104); a second servo motor (502) fixedly connected on the mounting frame (102), an output end of the second servo motor (502) being fixed with one reciprocating screw (501); a synchronous belt set (503) arranged between the two groups of reciprocating screws (501).

4. The heat dissipating device for photovoltaic power generation panel according to claim 1, wherein, The cooling device (105) comprises: a support frame (1501) fixedly connected on the recooling frame (104); a fan blade (1502) rotatably connected on the support frame (1501); two transmission bevel gears (1503) rotatably connected on the support frame (1501), the two transmission bevel gears (1503) being meshed, one transmission bevel gear (1503) being coaxially fixed with the fan blade (1502), and the other transmission bevel gear (1503) being key-connected with the transmission shaft (203) through the spline (302).

5. The heat dissipating device for photovoltaic power generation panel according to claim 1, wherein, The device further comprises: a fin (107) fixedly connected on the recooling frame (104), the fin (107) being used for expanding the heat exchange area of the recooling frame (104).

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