CN115297698A - Photovoltaic grid-connected inverter with self-adaptive heat dissipation capacity - Google Patents

Abstract

The invention discloses a photovoltaic grid-connected inverter with self-adaptive heat dissipation capability, which comprises an inverter cabinet, an induction tube, an inverter module and a supporting cylinder arranged in the inverter cabinet; the inverter cabinet includes a base plate arranged oppositely and the top plate, as well as the first side plate and the second side plate oppositely arranged between the bottom plate and the top plate; one end of the induction tube is attached to the inverter module and is used for real-time induction of the heat of the inverter module. When the heat of the module rises, the liquid on the inner wall of the induction tube boils and expands, and pushes the supporting cylinder connected to the other end of the induction tube to move towards the top plate in the direction perpendicular to the bottom plate, so that the supporting cylinder pushes the conductive dust filter to move, so that the second Side and top panels are open. The invention improves the heat dissipation and dust removal performance of the inverter, and ensures that the inverter can work with high efficiency in a high temperature environment.

Description

Photovoltaic grid-connected inverter with adaptive cooling capability

technical field

The invention belongs to the technical field of inverters, and in particular relates to a photovoltaic grid-connected inverter with adaptive heat dissipation capability.

Background technique

The grid-connected inverter is a special inverter. In addition to converting direct current into alternating current, the output alternating current can be synchronized with the frequency and phase of the mains, so the output alternating current can be returned to the mains, and the grid-connected inverter Transformers are commonly used in some DC voltage source and grid connection applications.

The heat dissipation system of grid-connected inverters mainly includes materials such as radiators, cooling fans, and heat-conducting silicone grease. At present, there are two main heat dissipation methods for inverters: one is natural cooling, and the other is forced air cooling. Usually, in scenarios with a power level above 50KW, forced air cooling is adopted for heat dissipation. However, in this way, since the inside is in full contact with the flowing air, the inside of the grid-connected inverter will be covered with dust everywhere, resulting in deterioration of heat dissipation conditions and greatly affecting heat dissipation performance.

Contents of the invention

The purpose of the present invention is to provide a photovoltaic grid-connected inverter with self-adaptive heat dissipation capability, which solves the problem of the existing grid-connected inverters, which tend to accumulate dust inside the inverter during forced air-cooled heat dissipation, resulting in heat dissipation effects worse problem.

The invention discloses a photovoltaic grid-connected inverter with self-adaptive heat dissipation capability, which includes an inverter cabinet, an induction tube arranged in the inverter cabinet, an inverter module, and a supporting cylinder;

The inverter cabinet includes a bottom plate and a top plate oppositely arranged, and a first side plate and a second side plate oppositely arranged between the bottom plate and the top plate;

One end of the induction tube is attached to the inverter module for real-time sensing of the heat of the inverter module. When the heat of the inverter module rises, the liquid on the inner wall of the induction tube boils and expands. pushing the support cylinder connected to the other end of the induction tube to move toward the top plate in a direction perpendicular to the bottom plate, so that the support cylinder pushes the conductive dust-proof net to move, so that the second side plate and The top plate is in an open state.

Further, a power supply contact is provided on the side of the top plate close to the bottom plate, and when the conductive dust-proof net is in contact with the power supply contact, the conductive dust-proof net is connected to the reverse The floating dust inside the cabinet is electrostatically adsorbed.

Further, when the heat of the inverter module decreases, the liquid on the inner wall of the induction tube tends to normal temperature, so that the supporting cylinder drives the conductive dust-proof net to move back and reset, and the conductive dust-proof net is separated from the power supply Contacts, the dust absorbed on the conductive dust-proof net falls to the receiving groove in the bottom plate.

Further, a sliding seat is provided on the second side plate, and a sliding bar is slidably connected to the sliding seat, and the sliding bar is connected to the conductive dust-proof net.

Further, a heat dissipation fan is arranged in the second side plate, and the heat dissipation fan is arranged directly opposite to the conductive dustproof net; the conductive dustproof net is attached to the outside of the second side, and the The length of the conductive dust-proof net relative to the second side is not less than the length of the cooling fan relative to the second side.

Further, the heat dissipation fan forms a cavity with the conductive dust-proof net and the inner wall of the second side plate;

One end of the supporting cylinder is connected to the conductive dust-proof net, and the other end is embedded and protrudes from the bottom plate.

Further, there are several ventilation holes arranged side by side in the first side plate, so as to facilitate the heat dissipation fan to bring the heat inside the inverter cabinet to the outside of the inverter cabinet through the ventilation holes.

Further, both the first side plate and the second side plate are hingedly connected to the top plate; the induction tube is connected to the support cylinder through a conduit.

Further, a support plate is provided on the first side plate and the second side plate, each of the support plates is connected with a hinge seat, and the hinge seat is hinged to the top plate.

Further, a main control board is provided on the base plate, and a DC input terminal, the inverter module, a current sensor, and a microcontroller are provided on the main control board; the main control board is respectively connected to the DC input terminal , the inverter module, the current sensor and the microcontroller are electrically connected; the inverter module is electrically connected to the microcontroller through the current sensor; the microcontroller and the DC input terminal are respectively It is electrically connected with the inverter module.

Due to the adoption of the above technical solution, the present invention has the following advantages: the method can sense the heat of the IGBT inverter module in real time through the setting of the induction tube. When the heat of the IGBT inverter module is high, the low boiling point liquid on the inner wall of the induction tube Boil and expand, and then push the supporting cylinder to perform telescopic movement, so that the supporting cylinder pushes the conductive dust-proof net to slide, so that the side plate is in the open state, and under the hinged relationship, pushes the top plate to open, and cooperates with the cooling fan to improve the inverter The heat dissipation effect of the inverter, and when the conductive dust-proof net is in contact with the power supply contacts, it can electrostatically adsorb the floating dust inside the inverter, which greatly improves the heat dissipation and dust removal performance of the inverter, so as to ensure that the inverter can be used in high temperature environments. Under normal conditions, avoid the problem of low working efficiency of the traditional inverter in high temperature environment.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following descriptions are only the ones recorded in the embodiments of the present invention For some embodiments, those skilled in the art can also obtain other drawings according to these drawings.

FIG. 1 is a schematic diagram of a grid-connected inverter according to an embodiment of the present invention;

Fig. 2 is a side view of the conductive dust-proof net in Fig. 1;

Fig. 3 is a schematic diagram of the circuit connection of the grid-connected inverter according to the embodiment of the present invention.

Reference signs:

Bottom board-1, side board-2, main control board-3, DC input terminal-4, IGBT inverter module-5, current sensor-6, microcontroller-7, heat dissipation mechanism-8, ventilation hole-81, heat dissipation Fan-82, conductive dust filter-83, slide bar-84, slide seat-85, dust holding tank-86, support cylinder-87, induction tube-88, support plate-89, hinge seat-891, top plate-892 , Power supply contact -893.

Detailed ways

The present invention will be further described in conjunction with the drawings and embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by persons of ordinary skill in the art shall fall within the protection scope of the embodiments of the present invention.

It should be noted in advance that in the present invention, unless otherwise clearly specified and limited, terms such as "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, or Integratively connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

As shown in Figure 1, Figure 2, and Figure 3, this embodiment provides a large-scale photovoltaic grid-connected inverter based on adaptive heat dissipation capability, including a base plate 1, and a side plate 2 is fixedly connected to the base plate 1, and the side plate 2 includes a relative arrangement The first side plate and the second side plate, the bottom plate 1 is provided with a main control board 3, the main control board 3 is provided with a DC input terminal 4, the main control board 3 is provided with an IGBT inverter module 5, and the main control board 3 A current sensor 6 is provided on the main control board 3, a microcontroller 7 is provided on the main control board 3, the DC input terminal 4 is electrically connected to the IGBT inverter module 5, and the IGBT inverter module 5 is electrically connected to the current sensor 6, and the DC input terminal 4 is electrically connected to the current sensor 6. 4. The combined use of the IGBT inverter module 5 and the current sensor 6 can convert DC to AC. The current sensor 6 is electrically connected to the microcontroller 7, and the microcontroller 7 is electrically connected to the IGBT inverter module 5. Through the current Sensor 6, microcontroller 7, IGBT inverter module 5, etc. are used together to effectively feedback the parameters of DC and AC. The bottom plate 1, side plate 2 and main control board 3 are jointly provided with a heat dissipation mechanism 8.

As shown in Fig. 1, Fig. 2 and Fig. 3, the heat dissipation mechanism 8 includes a ventilation hole 81, a heat dissipation fan 82, a conductive dustproof net 83, a sliding bar 84, a sliding seat 85, a dust receiving groove 86, a supporting cylinder 87, and an induction tube 88 , support plate 89, hinged seat 891, top plate 892 and power supply contact 893, the first side plate is provided with a ventilation hole 81, the second side plate is fixedly installed with a cooling fan 82, and the second side plate is contacted with a conductive dustproof Net 83, the conductive dust-proof net 83 is fixedly connected with a slide bar 84, the base plate 1 is provided with a dust receiving groove 86, and a support cylinder 87 is fixedly installed in the base plate 1, and the telescopic end of the support cylinder 87 is insulated from the conductive dust-proof net 83. The plates are fixedly connected, the side plate 2 is fixedly connected with a support plate 89, the support plate 89 is fixedly connected with a hinged seat 891, and the hinged seat 891 is hinged with a top plate 892. The combined use of other structures can improve the heat dissipation and dust removal effects of the inverter.

As shown in Figure 1, Figure 2, and Figure 3, a sliding seat 85 is fixedly connected to the second side plate, and the sliding seat 85 is slidably connected to the sliding bar 84. The dust net 83 is moved and guided. The main control board 3 is provided with an induction tube 88. The induction tube 88 is connected to the support cylinder 87 through a conduit. Through the setting of the induction tube 88, the support cylinder 87 can be assisted in telescopic movement. The top plate 892 and the side plate 2 contacts, the top plate 892 is fixedly connected with a power supply contact 893, through the setting of the power supply contact 893, it can ensure that the conductive dust-proof net 83 forms a closed loop.

The specific implementation process of the present invention is as follows: in normal temperature weather, start the heat dissipation fan 82, carry out forced air cooling to the inside of the inverter, and cooperate with the function of the ventilation hole 81 to ensure the effective circulation of air. It can effectively block dust;

In high temperature weather, the heat of the IGBT inverter module 5 increases, causing the liquid in the induction tube 88 to expand when heated, and under the action of the tube, the support cylinder 87 moves telescopically, pushing the conductive dust-proof net 83 to slide along the surface of the second side plate, Under the cooperative action of slide bar 84 and sliding seat 85, make conductive dustproof net 83 be in sliding stable state, finally make conductive dustproof net 83 far away from heat dissipation fan 82, improve the direct heat dissipation effect of heat dissipation fan 82; The dust net 83 is in contact with the power supply contact 893, and lifts the top plate 892. Under the hinged relationship, the top plate 892 is deflected, and finally the top plate 892 is separated from the side plate 2 to improve the heat dissipation effect;

Due to the upward movement of the hot air, under the action of the ventilation hole 81, the inverter will form two heat dissipation air passages, one part overflows from the heat dissipation gap, and the other part still flows out from the ventilation hole 81, and the two heat dissipation air passages are perpendicular to each other. As a result, a certain amount of turbulent flow is formed inside the inverter. The air flow velocity in the two cooling air passages is relatively high, and the air flow velocity in the turbulent flow area is relatively low; The dust on the upper cooling air duct is difficult to stay in the inverter, and will be discharged from the ventilation hole 81;

The dust in the cooling air duct in the vertical direction is easy to stay in the inverter under the action of gravity. Since the conductive dust-proof net 83 is in contact with the power supply contact 893, the conductive dust-proof net 83 forms a closed loop, and this part of the dust is electrostatically charged. Adsorption, after the temperature drops, the liquid in the induction tube 88 tends to normal temperature, so that the supporting cylinder 87 drives the conductive dust-proof net 83 to move back and reset, and the conductive dust-proof net 83 is separated from the power supply contact 893, so that the conductive dust-proof net 83 loses Due to the electrostatic property, the dust on the conductive dust-proof net 83 falls into the dust holding groove 86, which prevents the dust on the heat dissipation fan 82 from being sucked into the inverter when the follow-up cooling fan 82 is working.

This solution can sense the heat of the IGBT inverter module 5 in real time through the setting of the induction tube 88. When the heat of the IGBT inverter module 5 is high, the low boiling point liquid inside the induction tube 88 boils and expands, and then pushes the supporting cylinder 87 to expand and contract. Movement, so that the supporting cylinder 87 pushes the conductive dust-proof net 83 to slide, so that the side plate 2 is in the open state, and under the hinged relationship, pushes the top plate 892 to open, and cooperates with the cooling fan 82 to improve the heat dissipation effect of the inverter , and when the conductive dust-proof net 83 is in contact with the power supply contact 893, it can electrostatically adsorb the floating dust inside the inverter, which greatly improves the heat dissipation and dust removal performance of the inverter, so as to ensure that the inverter can be operated in a high temperature environment. It can work normally and avoid the problem of low working efficiency of traditional inverters in high temperature environment.

The principle of the present invention is: in normal temperature weather, start the heat dissipation fan to perform forced air cooling on the inside of the inverter, and cooperate with the function of the ventilation hole to ensure the effective circulation of the air. Under the action of the conductive dust-proof net, it can effectively intercepting dust;

In high temperature weather, the heat of the IGBT inverter module increases, causing the liquid in the induction tube to expand due to heat. Under the action of the conduit, the supporting cylinder moves telescopically, pushing the conductive dust-proof net to slide along the surface of the side plate. Under the cooperative action, the conductive dust-proof net is in a sliding and stable state, and finally the conductive dust-proof net is kept away from the cooling fan, and the direct heat dissipation effect of the cooling fan is improved; at this time, the conductive dust-proof net is in contact with the power supply contact, and the top plate is lifted , under the hinged relationship, the top plate is deflected, and finally the top plate is separated from the side plates to improve the heat dissipation effect;

Due to the upward movement of hot air, under the action of the ventilation holes, the inverter will form two heat dissipation air passages, one part overflows from the heat dissipation gap, and the other part still flows out from the ventilation holes, and the two heat dissipation air passages are perpendicular to each other, which will lead to reverse A certain turbulent flow is formed inside the inverter, the air velocity in the two heat dissipation air passages is higher, and the air velocity in the turbulent flow area is lower; The dust on the road is difficult to stay in the inverter and will be discharged from the ventilation holes;

The dust in the cooling air duct in the vertical direction is easy to stay in the inverter under the action of gravity. Since the conductive dust-proof net is in contact with the power supply contact, the conductive dust-proof net forms a closed loop, and this part of the dust is electrostatically adsorbed. After the temperature drops, the liquid in the induction tube tends to normal temperature, so that the supporting cylinder drives the conductive dust-proof net to move back and reset, and the conductive dust-proof net is separated from the power supply contacts, so that the conductive dust-proof net loses its electrostatic properties, and the dust on the conductive dust-proof net falls off. Falling into the dust holding groove, avoiding the dust on the subsequent cooling fan to be sucked into the inverter when it is working. Through the setting of the induction tube, the supporting cylinder can be assisted in telescopic movement. The heat dissipation and dust removal effects of the inverter can be improved through the combined use of heat dissipation fans, ventilation holes, support cylinders, top plates and other structures. Through the use of current sensors, microcontrollers, IGBT inverter modules, etc., the parameters of direct current and alternating current can be effectively fed back.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present invention can still be Any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention shall fall within the protection scope of the claims of the present invention.

Claims (10)

1. A photovoltaic grid-connected inverter with self-adaptive heat dissipation capability is characterized by comprising an inverter cabinet, and a sensing tube, an inverter module and a supporting cylinder which are arranged in the inverter cabinet;

the inversion cabinet comprises a bottom plate, a top plate, a first side plate and a second side plate, wherein the bottom plate and the top plate are arranged oppositely, and the first side plate and the second side plate are arranged between the bottom plate and the top plate oppositely;

one end of the induction pipe is attached to the inversion module and used for sensing the heat of the inversion module in real time, when the heat of the inversion module rises, liquid on the inner wall of the induction pipe boils and expands to push the supporting cylinder connected with the other end of the induction pipe to move towards the top plate in the direction perpendicular to the bottom plate, so that the supporting cylinder pushes the conductive dustproof net to move, and the second side plate and the top plate are in an open state.

2. The grid-connected photovoltaic inverter according to claim 1, wherein a power supply contact is disposed on a side surface of the top plate close to the bottom plate, and the conductive dust screen is turned on when contacting the power supply contact, so that the conductive dust screen performs electrostatic adsorption on floating dust inside the inverter cabinet.

3. The grid-connected photovoltaic inverter according to claim 2, wherein when the heat of the inverter module is reduced, the liquid inside the induction tube tends to normal temperature, so that the support cylinder drives the conductive dust screen to move back and reset, the conductive dust screen is separated from the power supply contact, and dust adsorbed on the conductive dust screen falls into a containing groove in the bottom plate.

4. The grid-connected photovoltaic inverter according to claim 1, wherein a sliding seat is disposed on the second side plate, a sliding strip is slidably connected to the sliding seat, and the sliding strip is connected to the conductive dust screen.

5. The photovoltaic grid-connected inverter according to claim 1, wherein a heat dissipation fan is arranged in the second side plate, and the heat dissipation fan is arranged opposite to the conductive dust screen; the conductive dustproof net is attached to the outer side of the second side face, and the length of the conductive dustproof net relative to the second side face is not smaller than the length of the cooling fan relative to the second side face.

6. The grid-connected photovoltaic inverter according to claim 5, wherein the heat dissipation fan, the conductive dust screen and the inner wall of the second side plate form a cavity;

one end of the supporting cylinder is connected with the conductive dustproof net, and the other end of the supporting cylinder is embedded in and protrudes out of the bottom plate.

7. The grid-connected photovoltaic inverter according to claim 6, wherein the first side plate has a plurality of parallel ventilation holes therein, so as to facilitate the heat dissipation fan to bring the heat inside the inverter cabinet to the outside of the inverter cabinet through the ventilation holes.

8. The photovoltaic grid-connected inverter according to claim 1, wherein the first side plate and the second side plate are both hinged to the top plate; the induction pipe is connected with the supporting cylinder through a guide pipe.

9. The grid-connected photovoltaic inverter according to claim 8, wherein support plates are disposed on the first side plate and the second side plate, and are connected to hinge seats, and the hinge seats are hinged to the top plate.

10. The grid-connected photovoltaic inverter according to claim 1, wherein a main control board is arranged on the bottom board, and a direct current input terminal, the inverter module, a current sensor and a microcontroller are arranged on the main control board; the main control board is electrically connected with the direct current input terminal, the inversion module, the current sensor and the microcontroller respectively; the inversion module is electrically connected with the microcontroller through the current sensor; the microcontroller and the direct current input terminal are respectively electrically connected with the inverter module.

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