Flexible grid-connected box for distributed photovoltaic and use method thereof

Abstract

The invention relates to the field of distributed photovoltaic grid-connected boxes, in particular to a flexible grid-connected box for distributed photovoltaics, which comprises a box body, side plates, a shielding piece and a fan, a ventilation opening is formed in each of the left lower part and the right lower part of the box body; the inner left wall and the inner right wall of the box body are each fixedly connected with a side plate. The inner left portion and the inner right portion of the box body are each provided with a shielding piece, the left side plate and the left shielding piece form a left channel, the left channel is communicated with the left ventilation opening, the right side plate and the right shielding piece form a right channel, and the right channel is communicated with the right ventilation opening. One fan is mounted in the left channel, the other fan is mounted in the right channel, and the fans can supply air upwards or downwards; air in the left channel and air in the right channel interact in the box body through the through holes of the shielding pieces. The problem that water easily enters two sides of a ventilation opening in the prior art is solved, and meanwhile damp air is prevented from entering the box body to damage components.

Description

Technical Field

[0001] The present invention relates to a distributed photovoltaic grid-connected box, and particularly to a flexible grid-connected box for distributed photovoltaics and its usage method. Background Art

[0002] In a distributed photovoltaic power generation system, as a key device for connecting photovoltaic modules to the power grid, the stability and reliability of the performance of the grid-connected box are crucial. There are obvious defects in the ventilation and heat dissipation design of the grid-connected box in the prior art. In traditional grid-connected boxes, ventilation holes are usually arranged on both sides of the box body. When facing natural environmental factors, especially on rainy days, rainwater easily flows into the grid-connected box along the ventilation holes. After the rainwater enters, it may directly contact the electrical components inside the box, causing serious problems such as short circuits and corrosion, greatly shortening the service life of the components, and even possibly leading to the failure of the entire grid-connected box, affecting the normal operation of the distributed photovoltaic power generation system, resulting in power supply interruption and economic losses.

[0003] In addition, in a humid environment, during the heat exchange process of the grid-connected box, a large amount of humid air will pour into the box along the ventilation holes. When the electrical components are in a humid environment for a long time, the metal parts are prone to rust, and the insulation performance deteriorates, thereby affecting the normal operation of the components.

[0004] In summary, the existing ventilation design of the grid-connected box urgently needs to be improved to overcome the deficiencies in waterproofing and moisture-proofing and ensure the stable and efficient operation of the distributed photovoltaic power generation system. Summary of the Invention

[0005] In order to overcome the drawbacks that when the ventilation holes of the grid-connected box are arranged on both sides, water easily enters on rainy days, and in a humid environment, when the grid-connected box exchanges heat, humid air enters the grid-connected box and may cause damage to the components, the present invention provides a flexible grid-connected box for distributed photovoltaics, including a box body, side plates, shielding members, and fans. A ventilation opening is provided at each of the lower left and lower right parts of the box body; a side plate is fixedly connected to each of the inner left wall and inner right wall of the box body; a shielding member is installed at each of the inner left part and inner right part of the box body. The left side plate and the left shielding member form a left channel, and the left channel communicates with the left ventilation opening. The right side plate and the right shielding member form a right channel, and the right channel communicates with the right ventilation opening; a fan is installed in the left channel, and another fan is installed in the right channel. The fans can blow air upward or downward; the air in the left channel and the right channel interacts in the box body through the through holes of the shielding member.

[0006] In one embodiment, a housing is fixedly connected to the lower side of each of the left ventilation opening and the right ventilation opening; a filter member is detachably connected in the housing.

[0007] In one embodiment, a sealing strip is provided on the door of the box body.

[0008] In one embodiment, the shielding member includes a middle orifice plate, a lower push rod, a lower orifice plate, an upper push rod, and an upper orifice plate; the middle part of the box body is fixedly connected to the middle orifice plate; the lower push rod is fixedly connected to the middle orifice plate; the telescopic part of the lower push rod is fixedly connected to the lower orifice plate, and the lower orifice plate is fixedly connected to the blower; the upper push rod is fixedly connected to the middle orifice plate; the telescopic part of the upper push rod is fixedly connected to the upper orifice plate, and a heating module is built in the blower.

[0009] In one embodiment, when the lower orifice plate and the upper orifice plate are attached to the middle orifice plate, the through holes of the lower orifice plate and the upper orifice plate are not communicated with the through hole of the middle orifice plate.

[0010] In one embodiment, a storage box is communicated with one side of the housing; an airbag is installed in the storage box; the filter element in the storage box is pushed to move through the airbag.

[0011] In one embodiment, a U-shaped connecting plate is fixedly connected to the bottom of the box body; a translation assembly is installed on the U-shaped connecting plate; a moving part of the translation assembly is detachably connected with a cutting knife.

[0012] In one embodiment, a baffle is detachably connected to one side of the U-shaped connecting plate.

[0013] In one embodiment, an air blowing pipe is further included, and the air blowing pipe is installed at the bottom of the housing.

[0014] A method for using a flexible grid-connected box for distributed photovoltaics, the grid-connected box has a clockwise external circulation mode, a counterclockwise external circulation mode, a pressurization mode, a negative pressure mode, and a clockwise internal circulation mode; In the heat dissipation mode, control the grid-connected box to work alternately between the clockwise external circulation mode and the counterclockwise external circulation mode; When a worker repairs and opens the box door, control the grid-connected box to work in the pressurization mode; When a worker repairs and closes the box door, control the grid-connected box to work in the negative pressure mode; In a low-temperature environment, control the grid-connected box to work in the clockwise internal circulation mode.

[0015] The beneficial effects are as follows: By arranging the ventilation openings at the bottom of the box body, the problem that the ventilation openings on both sides are prone to water ingress in the prior art is overcome. At the same time, by using the blower circulation, the outside air enters the box body through the filter element, ensuring that the entering air is clean and dry. The air sent out from the left and right channels blows and dries the filter element and blows away the sundries. And through the air circulation alternation, the filter element is dried and back-blown at all times, so that it maintains the filtering effect and prevents the humid air from entering the box body and damaging the components.

[0016] When workers perform maintenance and open the cabinet door, control the two fans to send air into the cabinet, increasing the air pressure inside the cabinet, making it easier to open the cabinet door and improving the safety of workers opening the cabinet door during high-altitude operations; when workers complete the maintenance and close the cabinet door, control the two fans to extract air from the cabinet, reducing the air pressure inside the cabinet to form a negative pressure, making the sealing strip fit tightly and ensuring the airtightness of the cabinet.

[0017] In a low-temperature environment, control the push rod of the shielding member to move the lower orifice plate and the upper orifice plate, so that the through holes of the shielding member are not connected. At the same time, the heating module in the fan works, generating a clockwise hot air flow inside the cabinet to heat the components inside the cabinet, preventing them from malfunctioning due to low temperature, and controlling the working state and power of the heating module through a temperature sensor.

[0018] When the filter element (such as a sponge) has a large amount of dust residue affecting the filtration effect, control the airbag to inflate and drive the filter element in the storage box to move, transferring the new part to below the ventilation opening, and transferring the old part with a large amount of dust residue to the cutter position for cutting, ensuring the filtration effect of the filter element. In addition, a blowing pipe is provided to blow air at the bottom of the filter element regularly or when the detection data of the air volume sensor is abnormal, blowing away the adsorbed large and light debris, ensuring that the air volume entering the cabinet meets the expectations. Description of the Drawings

[0019] Figure 1 Schematic structural diagram of the flexible grid connection box for distributed photovoltaics disclosed in the present invention; Figure 2 Schematic structural diagram of the clockwise external circulation and counterclockwise external circulation of the air inside the cabinet disclosed in the present invention; Figure 3 Schematic structural diagram of simultaneously sending air into the cabinet and simultaneously extracting air from the cabinet by the left and right fans disclosed in the present invention; Figure 4 Working state diagram of the present invention in a low-temperature environment; Figure 5 Schematic diagram of the state where the lower orifice plate, the upper orifice plate and the middle orifice plate are in contact disclosed in the present invention; Figure 6 Schematic diagram of the state where the lower orifice plate, the upper orifice plate and the middle orifice plate are unfolded disclosed in the present invention; Figure 7 Partial structural schematic diagram disclosed in the present invention; Figure 8 is Figure 7 Enlarged view of part A; Figure 9 is Figure 7 Bottom view.

[0020] Description of reference numerals: 1 - box body, 2 - side plate, 3 - shielding member, 4 - fan, 1a - ventilation opening, 1b - sealing strip, 5 - housing, 6 - filter element, 31 - middle orifice plate, 32 - lower push rod, 33 - lower orifice plate, 34 - upper push rod, 35 - upper orifice plate, 101 - storage box, 102 - airbag, 201 - U-shaped connecting plate, 202 - translation assembly, 203 - cutter, 204 - baffle, 301 - air blowing pipe. Detailed implementation manners

[0021] The following further illustrates the technical solution with specific embodiments. It should be noted that: The words indicating directions such as up, down, left, and right mentioned in this article are only in terms of the positions of the shown structures in the corresponding drawings. The serial numbers assigned to the components in this article itself, for example: first, second, etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. And as used in this application: connection, coupling, unless otherwise specified, all include direct and indirect connection (coupling).

[0022] Embodiment 1: A flexible grid-connected box for distributed photovoltaics, as Figures 1-9 shown, includes a box body 1, side plates 2, a shielding member 3 and fans 4; A ventilation opening 1a is provided at each of the lower left and lower right parts of the box body 1; A side plate 2 is fixedly connected to each of the inner left wall and inner right wall of the box body 1; A shielding member 3 is installed at each of the inner left part and inner right part of the box body 1. The left side plate 2 and the left shielding member 3 form a left channel, and the left channel communicates with the left ventilation opening 1a. The right side plate 2 and the right shielding member 3 form a right channel, and the right channel communicates with the right ventilation opening 1a; A fan 4 is installed in the left channel, and another fan 4 is installed in the right channel. The fan 4 can blow air upward or downward; The air in the left channel and the right channel interacts in the box body 1 through the through holes of the shielding member 3; A housing 5 is fixedly connected to the lower side of each of the left ventilation opening 1a and the right ventilation opening 1a; A filter element 6 is detachably connected in the housing 5; A sealing strip 1b is provided on the box door of the box body 1.

[0023] To overcome the problems in the prior art that the ventilation holes of the grid-connected box are provided on both sides and are prone to water ingress in rainy days, and in a humid environment, when the grid-connected box exchanges heat, humid air enters the interior of the grid-connected box, which may cause damage to components, the present invention is specifically proposed.

[0024] First, the present invention overcomes the problem of easy water ingress in the prior art by arranging the ventilation opening 1a at the bottom of the box body 1 and facing downward; Secondly, as Figure 2As shown in the figure, the air circulation in the left figure is clockwise. Among them, the left fan 4 blows air upward. After the air enters the left channel, it enters the box body 1 through the through hole of the left baffle 3. At the same time, the right fan 4 blows air downward, sucks the air in the box body 1 into the right channel, and transfers it to the outside through the right vent 1a. It should be noted that when the left fan 4 blows air into the left channel, the outside air passes through the left filter element 6, and the left filter element 6 filters the water vapor and impurities in the outside air, so that the air entering the box body 1 is clean and dry. At the same time, the air sent out from the right channel and the right vent 1a to the outside will blow on the right filter element 6 to dry it, and blow away the sundries intercepted at its bottom, so as to realize the self-cleaning of the filter element 6. Further, the components in the box body 1 work to generate heat, so that the air sent out from the right channel and the right vent 1a to the outside has a certain temperature, thus improving the drying effect on the right filter element 6. When the present invention operates in the clockwise air circulation mode shown in the left figure of Figure 2 for a period of time, the present invention can be controlled to operate in the counterclockwise air circulation mode shown in the right figure of Figure 2 for a period of time; such a cycle allows the air to circulate clockwise and counterclockwise externally in the present invention, so that the air entering the box body 1 is clean and dry, and at the same time, one of the filter elements 6 is dried and back-blown at all times to keep its filtering effect, thereby overcoming the problem that humid air enters the inside of the grid box in the prior art.

[0025] Further, when a worker repairs the present invention and needs to open the door of the box body 1, the two fans 4 can be controlled to blow air into the box body 1, as shown in the left figure of Figure 3 , so that the air pressure in the box body 1 increases, and it is more labor-saving for the worker to open the door, avoiding the difficulty of opening the door caused by the sealing strip 1b, which is unsafe for the worker to work at height. When the worker finishes the repair and needs to close the door, the two fans 4 can be controlled to blow air downward to suck the air in the box body 1 to the outside, as shown in the right figure of Figure 3 , so that the air pressure in the box body 1 becomes smaller, forming a negative pressure, so that the sealing strip 1b can be closely attached, ensuring the airtightness of the box body 1.

[0026] Embodiment 2: On the basis of Embodiment 1, as shown in Figures 1-9 , the baffle 3 includes a middle hole plate 31, a lower push rod 32, a lower hole plate 33, an upper push rod 34 and an upper hole plate 35; the middle part of the box body 1 is fixedly connected to the middle hole plate 31; the lower push rod 32 is fixedly connected to the middle hole plate 31; the telescopic part of the lower push rod 32 is fixedly connected to the lower hole plate 33, and the lower hole plate 33 is fixedly connected to the fan 4; the upper push rod 34 is fixedly connected to the middle hole plate 31; the telescopic part of the upper push rod 34 is fixedly connected to the upper hole plate 35, and the fan 4 is internally provided with a heating module.

[0027] When the lower orifice plate 33 and the upper orifice plate 35 are attached to the middle orifice plate 31, the through holes of the lower orifice plate 33 and the upper orifice plate 35 are not communicated with the through holes of the middle orifice plate 31.

[0028] Furthermore, as Figures 4-6 shown, when the present invention operates in a low-temperature environment, to prevent components in the box body 1 from failing to work due to low temperature in the low-temperature environment, the present invention controls the lower push rod 32 to push the lower orifice plate 33 upward, and the upper push rod 34 to push the upper orifice plate 35 downward, so that the shielding member 3 of the present invention moves from Figure 6 state to Figure 5 state. At this time, the lower orifice plate 33 and the upper orifice plate 35 are attached to the middle orifice plate 31, and the through holes of the lower orifice plate 33 and the upper orifice plate 35 are not communicated with the through holes of the middle orifice plate 31; during this process, the fan 4 also moves synchronously with the lower orifice plate 33; then, it is controlled that the left fan 4 blows air upward and the right fan 4 blows air downward, and at the same time, the heating module in the fan 4 works, so as to generate a clockwise hot air flow in the box body 1, thereby heating the components in the box body 1 to prevent them from failing to operate due to low temperature. In addition, a temperature sensor is provided in the box body 1 to control whether the heating module works and the working power.

[0029] Embodiment 3: On the basis of Embodiment 2, as Figures 1-9 shown, a storage box 101 is communicated with one side of the housing 5; an airbag 102 is installed in the storage box 101; the filter element 6 in the storage box 101 is pushed to move through the airbag 102.

[0030] The bottom of the box body 1 is fixedly connected with a U-shaped connecting plate 201; a translation assembly 202 is installed on the U-shaped connecting plate 201; the moving part of the translation assembly 202 is detachably connected with a cutter 203, and the filter element 6 floating out of the housing 5 is cut off by the cutter 203.

[0031] One side of the U-shaped connecting plate 201 is detachably connected with a baffle 204, and the cutter 203 is shielded and protected by the baffle 204.

[0032] It further includes a blowing air pipe 301, and the blowing air pipe 301 is installed at the bottom of the housing 5 to blow air to the bottom of the filter element 6.

[0033] Furthermore, the filter element 6 is a sponge. When a large amount of dust remains in the pores of the sponge, it will affect the filtering effect. Based on this problem, the present invention can control the airbag 102 to inflate and expand, thereby driving the filter element 6 stored in the storage box 101 to move, so that the new part of the filter element 6 is transferred below the ventilation opening 1a, and the old part of the filter element 6 with a large amount of dust remaining is transferred to the position of the cutter 203. By controlling the translation assembly 202 to drive the cutter 203 to move, the old part of the filter element 6 adsorbed with a large amount of dust is cut off, thus ensuring the filtering effect of the filter element 6.

[0034] Furthermore, there is not only dust in the outside air, but also some large and light sundries such as leaves and plastic bags. When the large and light sundries are sucked to the bottom of the filter element 6, the air intake effect of the filter element 6 will be seriously affected, making the air entering the box body 1 not as expected. To solve this problem, the present invention provides a blowing air pipe 301 to blow air to the bottom of the filter element 6 through the blowing air pipe 301, so as to blow away the large and light sundries adsorbed at the bottom of the filter element 6.

[0035] It should be understood that this embodiment is only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of this application.

Claims

1. A flexible grid-connected box for distributed photovoltaics, characterized in that: The invention comprises a box body (1), a side panel (2), a shielding member (3) and a fan (4); a ventilation opening (1a) is provided at the lower left and lower right parts of the box body (1); a side panel (2) is fixedly connected to the inner left wall and the inner right wall of the box body (1); a shielding member (3) is installed at the inner left and inner right parts of the box body (1); the left side panel (2) and the left shielding member (3) form a left channel, and the left channel is connected to the left ventilation opening (1a); the right side panel (2) and the right shielding member (3) form a right channel, and the right channel is connected to the right ventilation opening (1a); a fan (4) is installed in the left channel, and another fan (4) is installed in the right channel, and the fan (4) can send air upward or downward; the air in the left channel and the right channel exchanges in the box body (1) through the through hole of the shielding member (3).

2. A flexible grid-connected box for distributed photovoltaics according to claim 1, characterized in that: A housing (5) is fixedly connected to the lower side of each of the left ventilation opening (1a) and the right ventilation opening (1a); a filter element (6) is detachably connected to the inside of the housing (5).

3. A flexible grid-connected box for distributed photovoltaics according to claim 1, characterized in that: A sealing strip (1b) is provided on the door of the box body (1).

4. A flexible grid-connected box for distributed photovoltaics according to claim 1, characterized in that: The shielding member (3) comprises a middle orifice plate (31), a lower push rod (32), a lower orifice plate (33), an upper push rod (34) and an upper orifice plate (35); the middle of the box body (1) is fixedly connected to the middle orifice plate (31); the lower push rod (32) is fixedly connected to the middle orifice plate (31); the telescopic portion of the lower push rod (32) is fixedly connected to the lower orifice plate (33), and the lower orifice plate (33) is fixedly connected to the fan (4); the upper push rod (34) is fixedly connected to the middle orifice plate (31); the telescopic portion of the upper push rod (34) is fixedly connected to the upper orifice plate (35), and the fan (4) has a built-in heating module.

5. A flexible grid-connected box for distributed photovoltaics according to claim 4, characterized in that: When the lower orifice plate (33), the upper orifice plate (35) and the middle orifice plate (31) are attached to each other, the through holes of the lower orifice plate (33) and the upper orifice plate (35) are not connected to the through holes of the middle orifice plate (31).

6. A flexible grid-connected box for distributed photovoltaics according to claim 2, characterized in that: One side of the housing (5) is connected to a storage box (101); an air bag (102) is installed in the storage box (101); and the filter element (6) in the storage box (101) is pushed and moved by the air bag (102).

7. A flexible grid-connected box for distributed photovoltaics according to claim 6, characterized in that: A U-shaped connecting plate (201) is fixedly connected to the bottom of the box body (1); a translation assembly (202) is installed on the U-shaped connecting plate (201); and a cutter (203) is detachably connected to the movable part of the translation assembly (202).

8. A flexible grid-connected box for distributed photovoltaics according to claim 7, characterized in that: A baffle (204) is detachably connected to one side of the U-shaped connecting plate (201).

9. A flexible grid-connected box for distributed photovoltaics according to claim 2, characterized in that: It also includes a blowing pipe (301), and the blowing pipe (301) is installed at the bottom of the shell (5).

10. A method for using the grid-connected box according to any one of claims 5 to 9, characterized in that: The grid-connected box has clockwise external circulation mode, counterclockwise external circulation mode, boost mode, negative pressure mode, and clockwise internal circulation mode; In the heat dissipation mode, the grid-connected box is controlled to work alternately between the clockwise external circulation mode and the counterclockwise external circulation mode; When workers open the box door for maintenance, the grid-connected box is controlled to work in boosting mode; When workers are inspecting and closing the box door, the grid-connected box is controlled to work in negative pressure mode; In a low temperature environment, the grid-connected box is controlled to operate in a clockwise internal circulation mode.

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