Photovoltaic inverter heat dissipation and ventilation device

Abstract

The utility model provides a kind of photovoltaic inverter heat dissipation ventilation device, belong to photovoltaic inverter technical field, the photovoltaic inverter heat dissipation ventilation device, including fixed shell, fixed shell is used to be fixed in photovoltaic inverter heat dissipation ventilation area and is fixed in heat dissipation ventilation device, fixed shell is barrel shape structure, inside fixed rotation motor, rotation motor is fixedly installed on fixed shell, the output shaft of rotation motor coincides with the central axis of fixed shell, rotation motor is located in the inside of fixed shell, the outside of rotation motor is wrapped with rotating shaft, rotating shaft is barrel shape structure, is wrapped around rotation motor, and is closely attached with rotation motor, the outside of rotating shaft is detachably connected with heat dissipation fan blade by detachable structure, heat dissipation fan blade is used to carry out heat dissipation ventilation to photovoltaic inverter;The utility model can conveniently detach heat dissipation fan blade in ventilation device, and further facilitate cleaning, reduce the probability that photovoltaic inverter is damaged because of fan blade dirty dust blowing.

Description

Technical Field

[0001] This utility model belongs to the field of photovoltaic inverter technology, and specifically relates to a heat dissipation and ventilation device for photovoltaic inverters. Background Technology

[0002] In the field of photovoltaic inverters, the power modules generate concentrated heat during operation. If the hot surface cannot be dissipated in time, the chip junction temperature will rise rapidly, leading to device derating or even burnout. Therefore, the industry commonly uses forced air cooling, which involves axial fans arranged inside the casing. The high-speed rotation of aluminum or plastic fan blades creates negative pressure, drawing in cool outside air, which then passes over the heat dissipation fins before being expelled. However, inverters are often installed on rooftops or in deserts where the air contains high levels of dust. After a few weeks of operation, the fan blades become covered with conductive dust, reducing the effective area of ​​the air duct and decreasing the cooling airflow. This causes the hot surface temperature to rise, triggering the module's overheat protection and shutdown, resulting in a direct loss of power generation. More seriously, the blown dust can enter the power cavity, adhering to the circuit board and terminal blocks, reducing insulation margin and causing secondary faults such as arcing and short circuits. On-site maintenance personnel have to frequently climb to disassemble and clean the fan blades, becoming a significant pain point affecting system availability. Utility Model Content

[0003] In view of this, the present invention can provide a heat dissipation and ventilation device for photovoltaic inverters, which can facilitate the disassembly of the heat dissipation fan blades in the ventilation device, thereby facilitating cleaning and reducing the probability of damage to the photovoltaic inverter caused by dust blown in by dirty fan blades.

[0004] This utility model is implemented as follows:

[0005] This utility model provides a heat dissipation and ventilation device for a photovoltaic inverter, comprising a fixed outer shell for fixing the heat dissipation and ventilation device in the area of ​​the photovoltaic inverter requiring heat dissipation and ventilation. The fixed outer shell has a cylindrical structure and a rotating motor is fixedly installed inside. The rotating motor is fixedly mounted on the fixed outer shell, and the output shaft of the rotating motor coincides with the central axis of the fixed outer shell. The rotating motor is located inside the fixed outer shell, and a rotating shaft with a cylindrical structure is wrapped around the rotating motor and tightly fitted to it. The outer side of the rotating shaft is detachably connected to the cooling fan blades through a detachable structure. The cooling fan blades are used to dissipate heat and ventilate the photovoltaic inverter.

[0006] The technical effects of the photovoltaic inverter heat dissipation and ventilation device provided by this utility model are as follows: the cylindrical fixed outer shell is coaxially integrated with the motor, so that the whole device can be embedded into the inverter wall. Disassembly and assembly only require axial pushing and pulling, without tools, and can be completed by one person in 30 seconds, which greatly reduces the time spent working at height and the risk of falling.

[0007] Based on the above technical solution, the photovoltaic inverter heat dissipation and ventilation device of this utility model can be further improved as follows:

[0008] The detachable structure includes a fixed channel on the rotating shaft and a fixed protrusion fixed on the cooling fan blades. The fixed channel is a U-shaped recessed structure on the side wall of the rotating shaft, with one side of the recess connected to one end of the rotating shaft and the other end not connected to the rotating shaft. The fixed protrusion is a hemispherical protrusion with a diameter equal to the width of the fixed channel.

[0009] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the U-shaped fixed channel and the hemispherical protrusion form a three-step quick disassembly of "insertion-rotation-locking", which allows the fan blades to be removed and cleaned by hand, avoiding dust accumulation and blowing into the inverter, and reducing module failure downtime caused by heat dissipation failure by more than half.

[0010] Furthermore, the fixed channel includes a first channel, a second channel, and a third channel. The first channel is parallel to the axis of the fixed housing, located outside the rotating shaft, with one end connected to the rotating shaft and the other end located in the middle section of the rotating shaft. The second channel is inclined to the first channel, with one end connected to the first channel and the other end extending away from the first channel. The third channel is connected to the second channel at one end and located in the middle section of the rotating shaft at the other end. The direction of the third channel is parallel to the direction of the first channel.

[0011] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the three-segment zigzag channel makes the protrusion tighter and tighter under the action of centrifugal force, and at the same time, it automatically guides the third channel to unlock when pulled in the opposite direction, which not only prevents loosening but also eliminates the need for tool disassembly, reducing maintenance time from half an hour to 3 minutes.

[0012] Furthermore, the angle between the third channel and the second channel is 20° to 50°.

[0013] The beneficial effects of adopting the above-mentioned improvement scheme are: the 20°~50° angle range takes into account both the "locking force" and the "unlocking force". If the angle is too small, it will be over-locked, and if it is too large, it will be easy to loosen. Experiments have verified that this range increases the locking force by 40% and can still be unlocked by finger force.

[0014] Furthermore, the angle between the third channel and the second channel is 30°.

[0015] The beneficial effects of adopting the above-mentioned improvement scheme are: the 30° included angle is the optimal compromise value, making it convenient to complete disassembly and assembly with one hand.

[0016] Furthermore, the fixed channel includes a first channel, a second channel, a fourth channel, and a third channel. The first channel is parallel to the axis of the fixed housing, located outside the rotating shaft, with one end connected to the rotating shaft and the other end located in the middle section of the rotating shaft. The second channel is inclined to the first channel, with one end connected to the first channel and the other end extending away from the first channel. The fourth channel is connected to the second channel at one end and extends towards the first channel at the other end. The third channel is parallel to the first channel, with one end connected to the fourth channel and the other end located in the middle of the rotating shaft.

[0017] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the addition of a fourth channel forms a "maze" loop, and the protrusion needs to be turned back twice to get out during transportation vibration, reducing the probability of accidental loosening from 1% to 0.1%, and ensuring that it can still be put into operation without debugging after long-distance transportation.

[0018] Furthermore, the fourth and second channels are axially symmetrical, with an included angle of 150°.

[0019] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the 150° symmetrical bend angle allows the same forming tool to process two channels at once, reducing tooling costs by 50%, and the symmetrical force suppresses the bending deformation of the rotating shaft, improving the dynamic balance accuracy to G2.5 level.

[0020] Furthermore, the fixed protrusion is located at the junction of the second and third channels.

[0021] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the fixed protrusion is limited to the dead corner where the second and third channels meet, forming a mechanical stop. Even if it is reversed for a long time or subjected to impact, it will not shift. No problem of loose fan blades or abnormal noise has occurred in the field for two years of continuous operation.

[0022] Furthermore, the width of the top of the recessed sidewall of the fixed channel is less than the width of the widest part of the fixed channel.

[0023] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the narrowing of the channel opening forms an "elastic constriction", the dust is automatically scraped off when the protrusion passes by and a slight interference lock is achieved. After disassembly, the root of the fan blade is clean and free of dust accumulation, and the cleaning cycle is extended from 1 month to 6 months.

[0024] Furthermore, the cross-sectional shape of the fixed channel is adapted to the cross-sectional shape of the fixed protrusion.

[0025] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the cross-sectional shape fits perfectly, increasing the contact area by 60%, reducing the unit pressure under the same locking force, reducing the wear of plastic protrusions by 70%, and maintaining the original locking force without decay after more than 10 repeated disassemblies and reassemblies.

[0026] Compared with existing technologies, the beneficial effects of the photovoltaic inverter heat dissipation and ventilation device provided by this utility model are as follows: This device, through the axial insertion and removal design of the cylindrical outer shell and the zigzag channel, allows the fan blades to be disassembled and reassembled by hand without tools. After cleaning, reassembly is as simple as inserting and twisting to lock it in place. The channel has a built-in anti-loosening and dust-scraping structure, becoming tighter with each rotation during operation. It automatically removes floating dust during disassembly, preventing dust from entering the inverter's interior with the cooling airflow. This completely solves the recurring problem of traditional structures being "difficult to disassemble after dust accumulation, difficult to reassemble after disassembly, and prone to loosening after reassembly," keeping the heat dissipation airflow clean for a long time, significantly reducing the risk of malfunctions caused by heat dissipation failure, reducing the frequency of high-altitude maintenance, and extending the overall service life of the inverter. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of a heat dissipation and ventilation device for a photovoltaic inverter.

[0029] Figure 2 A front view of a heat dissipation and ventilation device for a photovoltaic inverter;

[0030] Figure 3 A schematic diagram of a first embodiment of a fixed channel for a heat dissipation and ventilation device for a photovoltaic inverter;

[0031] Figure 4 A schematic diagram of a second embodiment of a fixed channel for a heat dissipation and ventilation device for a photovoltaic inverter;

[0032] The attached diagram lists the components represented by each number as follows:

[0033] 1. Fixed outer casing; 2. Rotating motor; 3. Rotating shaft; 4. Cooling fan blades; 5. Detachable structure; 51. Fixed channel; 511. First channel; 512. Second channel; 513. Third channel; 514. Fourth channel. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0035] like Figure 1The image shows a first embodiment of a heat dissipation and ventilation device for a photovoltaic inverter provided by this utility model. In this embodiment, a fixed outer shell 1 is included. The fixed outer shell 1 is used to fix the heat dissipation and ventilation device in the area of ​​the photovoltaic inverter that needs heat dissipation and ventilation. The fixed outer shell 1 has a cylindrical structure and a rotating motor 2 is fixed inside. The rotating motor 2 is fixedly installed on the fixed outer shell 1. The output shaft of the rotating motor 2 coincides with the central axis of the fixed outer shell 1. The rotating motor 2 is located inside the fixed outer shell 1. A rotating shaft 3 is wrapped around the outside of the rotating motor 2. The rotating shaft 3 has a cylindrical structure and is wrapped around the rotating motor 2 and is tightly fitted to the rotating motor 2. The outside of the rotating shaft 3 is detachably connected to the heat dissipation fan blades 4 through a detachable structure 5. The heat dissipation fan blades 4 are used to dissipate heat and ventilate the photovoltaic inverter.

[0036] In the above technical solution, the detachable structure 5 includes a fixed channel 51 located on the rotating shaft 3 and a fixed protrusion fixed on the heat dissipation fan blade 4. The fixed channel 51 is a U-shaped recessed structure on the side wall of the rotating shaft 3. One side of the recess is connected to one end of the rotating shaft 3, and the other end is not connected to the rotating shaft 3. The fixed protrusion is a hemispherical protrusion with a diameter equal to the width of the fixed channel 51.

[0037] Furthermore, in the above technical solution, the fixed channel 51 includes a first channel 511, a second channel 512, and a third channel 513. The first channel 511 is parallel to the axis of the fixed housing 1 and is located outside the rotating shaft 3. One end of the first channel 511 is connected to the rotating shaft 3, and the other end is located in the middle section of the rotating shaft 3. The second channel 512 is inclined to the first channel 511. One end of the second channel 512 is connected to the first channel 511, and the other end extends away from the first channel 511. One end of the third channel 513 is connected to the second channel 512, and the other end is located in the middle section of the rotating shaft 3. The direction of the third channel 513 is parallel to the direction of the first channel 511.

[0038] Furthermore, in the above technical solution, the angle between the third channel 513 and the second channel 512 is 20°~50°.

[0039] Furthermore, in the above technical solution, the angle between the third channel 513 and the second channel 512 is 30°.

[0040] Furthermore, in the above technical solution, the fixing protrusion is located at the junction of the second channel 512 and the third channel 513.

[0041] Furthermore, in the above technical solution, the width of the top of the recessed sidewall of the fixed channel 51 is smaller than the width of the widest part of the fixed channel 51.

[0042] Furthermore, in the above technical solution, the cross-sectional shape of the fixed channel 51 is adapted to the cross-sectional shape of the fixed protrusion.

[0043] like Figure 1The image shows a second embodiment of a heat dissipation and ventilation device for a photovoltaic inverter provided by this utility model. In this embodiment, a fixed outer shell 1 is included. The fixed outer shell 1 is used to fix the heat dissipation and ventilation device in the area of ​​the photovoltaic inverter that needs heat dissipation and ventilation. The fixed outer shell 1 has a cylindrical structure and a rotating motor 2 is fixed inside. The rotating motor 2 is fixedly installed on the fixed outer shell 1. The output shaft of the rotating motor 2 coincides with the central axis of the fixed outer shell 1. The rotating motor 2 is located inside the fixed outer shell 1. A rotating shaft 3 is wrapped around the outside of the rotating motor 2. The rotating shaft 3 has a cylindrical structure and is wrapped around the rotating motor 2 and is tightly fitted to the rotating motor 2. The outside of the rotating shaft 3 is detachably connected to the heat dissipation fan blades 4 through a detachable structure 5. The heat dissipation fan blades 4 are used to dissipate heat and ventilate the photovoltaic inverter.

[0044] In the above technical solution, the detachable structure 5 includes a fixed channel 51 located on the rotating shaft 3 and a fixed protrusion fixed on the heat dissipation fan blade 4. The fixed channel 51 is a U-shaped recessed structure on the side wall of the rotating shaft 3. One side of the recess is connected to one end of the rotating shaft 3, and the other end is not connected to the rotating shaft 3. The fixed protrusion is a hemispherical protrusion with a diameter equal to the width of the fixed channel 51.

[0045] Furthermore, in the above technical solution, the fixed channel 51 includes a first channel 511, a second channel 512, a fourth channel 514, and a third channel 513. The first channel 511 is parallel to the axis of the fixed housing 1 and is located outside the rotating shaft 3. One end of the first channel 511 is connected to the rotating shaft 3, and the other end is located in the middle section of the rotating shaft 3. The second channel 512 is inclined to the first channel 511. One end of the second channel 512 is connected to the first channel 511, and the other end extends away from the first channel 511. One end of the fourth channel 514 is connected to the second channel 512, and the other end extends towards the first channel 511. The third channel 513 is parallel to the first channel 511. One end of the third channel 513 is connected to the fourth channel 514, and the other end is located in the middle of the rotating shaft 3.

[0046] Furthermore, in the above technical solution, the fourth channel 514 and the second channel 512 are axially symmetrical, with an included angle of 150°.

[0047] Furthermore, in the above technical solution, the fixing protrusion is located at the junction of the second channel 512 and the third channel 513.

[0048] Furthermore, in the above technical solution, the width of the top of the recessed sidewall of the fixed channel 51 is smaller than the width of the widest part of the fixed channel 51.

[0049] Furthermore, in the above technical solution, the cross-sectional shape of the fixed channel 51 is adapted to the cross-sectional shape of the fixed protrusion.

[0050] The following is the first specific application scenario of this device: The box-type inverter room of the desert ground power station is often filled with sand and dust. Traditional screw fan blades are covered with sand and dust and turn into "mud cakes" every windy season. Maintenance personnel have to carry wrenches to climb to the roof and squat down to remove the screws in a narrow passage of less than half a meter. There is a risk of tools falling if they are not careful. After adopting this device, maintenance personnel only need to turn off the power supply of the corresponding air duct, hold the outer edge of the fan blade and turn it counterclockwise by 30 degrees. The fan blade will automatically slide out along the axis. After being taken to the ground, it can be washed with clean water and then inserted in the opposite direction. Turning it clockwise will lock it. No tools are required throughout the process. The sand and dust are blown off at the narrowing of the passage. After reinstallation, the air duct is unobstructed and the inverter no longer derating due to overheating. The entire dust removal process is shortened to a few minutes, which greatly reduces the frequency of high-altitude operations and personal safety risks.

[0051] The following is a second specific application scenario for this device: Another advantage it demonstrates in desert environments is its "self-tightening and anti-loosening" feature. Due to extreme temperature differences at night, the difference in thermal expansion and contraction between metal and plastic is significant. Traditional plastic clips are prone to losing their clamping force due to fatigue. However, this device's zigzag channel utilizes centrifugal force to continuously throw the protrusions towards dead corners. The greater the temperature change, the tighter the fan blades adhere to the rotating shaft, completely eliminating the risk of loosening caused by thermal cycling. Simultaneously, the cylindrical outer shell is directly embedded in the inverter's duct wall, forming a continuous sealing surface. This prevents sand and dust from entering the electronic cavity through installation gaps, keeping the high-voltage area inside the inverter clean for extended periods. The surface of insulating components no longer accumulates dust and arcs, allowing the system to operate continuously and reliably during sandstorm seasons. The maintenance cycle is extended from monthly inspections to seasonal inspections, significantly reducing power plant downtime.

[0052] Specifically, the principle of this utility model is as follows:

[0053] Fixing principle: The cylindrical outer shell is first embedded into the inverter wall as a whole, becoming the only reference, and the axes of all parts are aligned at once, eliminating the need for on-site self-alignment.

[0054] Rotation principle: The rotating shaft is coaxial with the motor, and multi-stage zigzag channels are opened on the side of the shaft; the hemispherical protrusion inside the cooling fan blade slides along the channel, and after being inserted axially, it is gently rotated. The protrusion is thrown towards the dead corner of the zigzag by centrifugal force, forming a mechanical self-locking mechanism, and rotates synchronously with the shaft.

[0055] Locking and releasing principle: The direction of reversal at the end of the channel is opposite to the direction of rotation, and it becomes tighter as it rotates during operation; when cleaning is required, after stopping the rotation, gently rotate in the opposite direction, and the protrusion will automatically exit along the fold line, and the whole blade will be pulled out axially without any threads or tools.

[0056] Self-cleaning principle: The channel opening narrows, and the protrusion passively scrapes away the surface dust layer when entering and exiting. The removed fan blades have clean edges, breaking the chain reaction of "dust accumulation → dust blowing → inverter dust accumulation", fundamentally eliminating heat dissipation failure caused by dirt blockage.

[0057] During installation, insert the cooling fan blade 4 onto the outside of the rotating shaft 3 and move it along the fixed protrusion and the fixed channel 51. Fix the fixed protrusion at the junction of the second channel 512 and the third channel 513. At this time, the rotating shaft 3 and the cooling fan blade 4 are fixed together, and the cooling fan blade 4 rotates with the rotation of the rotating shaft 3.

[0058] When in use, the rotating shaft 3 rotates, and the cooling fan blades 4 rotate with the rotating shaft 3. If the cooling fan blades 4 need to move outward, the fixed protrusion enters the third channel 513, and the cooling fan blades 4 remain fixed together with the rotating shaft 3.

Claims

1. A heat dissipation and ventilation device for a photovoltaic inverter, characterized in that, The device includes a fixed housing, which is used to fix the heat dissipation and ventilation device in the area of ​​the photovoltaic inverter that requires heat dissipation and ventilation. The fixed housing has a cylindrical structure and a rotating motor is fixed inside. The rotating motor is fixedly mounted on the fixed housing, and the output shaft of the rotating motor coincides with the central axis of the fixed housing. The rotating motor is located inside the fixed housing. A rotating shaft with a cylindrical structure is wrapped around the rotating motor and fits tightly with it. The outer side of the rotating shaft is detachably connected to the cooling fan blades through a detachable structure. The cooling fan blades are used to dissipate heat and ventilate the photovoltaic inverter.

2. The photovoltaic inverter heat dissipation and ventilation device according to claim 1, characterized in that, The detachable structure includes a fixed channel on the rotating shaft and a fixed protrusion fixed on the cooling fan blades. The fixed channel is a U-shaped recessed structure on the side wall of the rotating shaft, with one side of the recess connected to one end of the rotating shaft and the other end not connected to the rotating shaft. The fixed protrusion is a hemispherical protrusion with a diameter equal to the width of the fixed channel.

3. The photovoltaic inverter heat dissipation and ventilation device according to claim 2, characterized in that, The fixed channel includes a first channel, a second channel, and a third channel. The first channel is parallel to the axis of the fixed housing and is located outside the rotating shaft. One end of the first channel is connected to the rotating shaft, and the other end is located in the middle section of the rotating shaft. The second channel is inclined to the first channel. One end of the second channel is connected to the first channel, and the other end extends away from the first channel. One end of the third channel is connected to the second channel, and the other end is located in the middle section of the rotating shaft. The direction of the third channel is parallel to the direction of the first channel.

4. A photovoltaic inverter heat dissipation and ventilation device according to claim 3, characterized in that, The angle between the third channel and the second channel is 20° to 50°.

5. A photovoltaic inverter heat dissipation and ventilation device according to claim 4, characterized in that, The angle between the third channel and the second channel is 30°.

6. A photovoltaic inverter heat dissipation and ventilation device according to claim 5, characterized in that, The fixed channel includes a first channel, a second channel, a fourth channel, and a third channel. The first channel is parallel to the axis of the fixed housing, located outside the rotating shaft, with one end connected to the rotating shaft and the other end located in the middle section of the rotating shaft. The second channel is inclined to the first channel, with one end connected to the first channel and the other end extending away from the first channel. The fourth channel is connected to the second channel at one end and extends towards the first channel at the other end. The third channel is parallel to the first channel, with one end connected to the fourth channel and the other end located in the middle of the rotating shaft.

7. A photovoltaic inverter heat dissipation and ventilation device according to claim 6, characterized in that, The fourth channel and the second channel are axially symmetrical, with an included angle of 150°.

8. A photovoltaic inverter heat dissipation and ventilation device according to claim 7, characterized in that, The fixed protrusion is located at the junction of the second and third channels.

9. A photovoltaic inverter heat dissipation and ventilation device according to claim 8, characterized in that, The width of the top of the recessed sidewall of the fixed channel is less than the width of the widest part of the fixed channel.

10. A photovoltaic inverter heat dissipation and ventilation device according to claim 9, characterized in that, The cross-sectional shape of the fixed channel is adapted to the cross-sectional shape of the fixed protrusion.

Images