A flexible grid-connected box for distributed photovoltaics and its use method

Abstract

The present invention relates to the field of distributed photovoltaic grid-connected boxes, and in particular to a flexible grid-connected box for distributed photovoltaic systems, comprising a box body, side panels, a shielding member, and a fan. A vent is provided at both the lower left and lower right portions of the box body. A side panel is fixedly connected to the inner left and right walls of the box body. A shield is installed at both the inner left and inner right portions of the box body. The left side panel and the left shielding member form a left channel, which is connected to the left vent. The right side panel and the right shielding member form a right channel, which is connected to the right vent. 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 and right channels interact within the box body through the through-holes in the shielding member. This overcomes the problem of water easily entering the vents on both sides in the prior art, while also preventing humid air from entering the box body and damaging components.

Description

Technical Field

[0001] The present invention relates to a distributed photovoltaic grid-connected box, and in particular to a flexible grid-connected box for distributed photovoltaics and a method of using the box. Background Art

[0002] In distributed photovoltaic power generation systems, the grid-connected box is a key device for connecting photovoltaic modules to the power grid, and its performance stability and reliability are of vital importance. Grid-connected boxes in existing technologies have obvious defects in ventilation and heat dissipation design. Traditional grid-connected boxes usually have ventilation holes on both sides of the box. This layout is very difficult to deal with when facing natural environmental factors, especially on rainy days, as rainwater can easily flow into the grid-connected box through the ventilation holes. Once 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 may even cause the entire grid-connected box to malfunction, affecting the normal operation of the distributed photovoltaic power generation system, resulting in power supply interruptions and economic losses.

[0003] Furthermore, in humid environments, when the grid-connected box is exchanging heat, moist air will flow into the box through the ventilation holes. When electrical components are exposed to humid conditions for a long time, their metal parts are prone to rusting, and their insulation performance deteriorates, which in turn affects the normal operation of the components.

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

[0005] In order to overcome the disadvantages of the ventilation holes of the grid-connected box being arranged on both sides, which easily lead to water ingress on rainy days, and the disadvantages of moist air entering the grid-connected box during heat exchange in humid environments, which may cause damage to components, the present invention provides a flexible grid-connected box for distributed photovoltaics, comprising a box body, side panels, a shielding member, and a fan;

[0006] A vent is provided at the lower left and right parts of the box; a side panel is fixedly connected to the inner left wall and the inner right wall of the box; a shield is installed at the inner left and the inner right parts of the box, the left side panel and the left shield form a left channel, and the left channel is connected to the left vent, the right side panel and the right shield form a right channel, and the right channel is connected to the right vent; a fan is installed in the left channel, and another fan is installed in the right channel, and the fans can supply air upward or downward; the air in the left channel and the right channel interacts in the box through the through holes of the shield.

[0007] In one embodiment, a shell is fixedly connected to the lower side of the left vent and the lower side of the right vent; a filter element is detachably connected to the inside of the shell.

[0008] In one embodiment, a sealing strip is provided on the door of the box body.

[0009] 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 fixed to the middle orifice plate; the lower push rod is fixed to the middle orifice plate; the telescopic part of the lower push rod is fixed to the lower orifice plate, and the lower orifice plate is fixed to the fan; the upper push rod is fixed to the middle orifice plate; the telescopic part of the upper push rod is fixed to the upper orifice plate, and the fan has a built-in heating module.

[0010] In one embodiment, when the lower orifice plate, the upper orifice plate and the middle orifice plate are attached to each other, the through holes of the lower orifice plate and the upper orifice plate are not connected to the through holes of the middle orifice plate.

[0011] In one embodiment, one side of the housing is connected to a storage box; an air bag is installed in the storage box; and the filter element in the storage box is pushed and moved by the air bag.

[0012] In one embodiment, a U-shaped connecting plate is fixedly connected to the bottom of the box; a translation assembly is installed on the U-shaped connecting plate; and a moving part of the translation assembly is detachably connected to the cutter.

[0013] In one embodiment, a detachable connecting baffle is provided on one side of the U-shaped connecting plate.

[0014] In one embodiment, a blowing pipe is further included, and the blowing pipe is installed at the bottom of the shell.

[0015] A method for using a flexible grid-connected box for distributed photovoltaics, wherein the grid-connected box has a clockwise external circulation mode, a counterclockwise external circulation mode, a boost mode, a negative pressure mode, and a clockwise internal circulation mode;

[0016] In heat dissipation mode, the grid-connected box is controlled to work alternately between clockwise external circulation mode and counterclockwise external circulation mode;

[0017] When workers are inspecting and opening the box door, the grid-connected box is controlled to operate in boosting mode;

[0018] When workers are inspecting and closing the box door, the grid box is controlled to work in negative pressure mode;

[0019] In low temperature environment, the grid-connected box is controlled to operate in clockwise internal circulation mode.

[0020] The beneficial effects are as follows:

[0021] By placing the vents at the bottom of the box, the problem of water easily entering the existing vents on both sides is overcome. At the same time, the fan circulates outside air through the filter element and enters the box, ensuring that the incoming air is clean and dry. The air sent from the left and right channels dries the filter element and removes debris. The alternating air circulation constantly dries and back-blows the filter element, maintaining its filtering effect and preventing moist air from entering the box and damaging components.

[0022] When workers open the box door for maintenance, the two fans are controlled to supply air into the box to increase the air pressure inside the box, making opening the box door less labor-intensive and improving the safety of workers opening the box door during high-altitude operations. When workers complete maintenance and close the box door, the two fans are controlled to exhaust air into the box to reduce the air pressure inside the box and form a negative pressure, allowing the sealing strip to fit tightly and ensure the airtightness of the box.

[0023] In a low-temperature environment, the push rod of the shielding piece is controlled to push the lower orifice plate and the upper orifice plate to move, so that the through holes of the shielding piece are blocked. At the same time, the heating module in the fan works to generate a clockwise hot air flow in the box to heat the components in the box to prevent them from being unable to operate due to low temperature. The working status and power of the heating module are controlled by the temperature sensor.

[0024] When a filter element (such as a sponge) retains a significant amount of dust, affecting its filtration performance, the airbag is inflated to move the filter element within the storage box, moving the new area below the vent and removing the old, dust-laden area to the cutter position, ensuring the filter's filtration effectiveness. Furthermore, a blower pipe is installed to blow air to the bottom of the filter element periodically or when abnormal air volume sensor data is detected, removing any large or light debris that has been absorbed and ensuring the expected amount of air entering the box. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of a flexible grid-connected box for distributed photovoltaics disclosed in the present invention;

[0026] Figure 2 It is a schematic diagram of the structure of clockwise and counterclockwise external circulation of air in the box disclosed by the present invention;

[0027] Figure 3 This is a schematic diagram of the structure disclosed in the present invention in which air is simultaneously supplied into the box and simultaneously extracted from the box by the left and right fans;

[0028] Figure 4 This is a working state diagram of the present invention in a low temperature environment;

[0029] Figure 5 This is a diagram showing the state in which the lower orifice plate, the upper orifice plate and the middle orifice plate disclosed in the present invention are fitted together;

[0030] Figure 6 This is a diagram of the unfolded state of the lower orifice plate, the upper orifice plate and the middle orifice plate disclosed in the present invention;

[0031] Figure 7 It is a schematic diagram of the local structure disclosed in the present invention;

[0032] Figure 8 for Figure 7 A magnified view of point A;

[0033] Figure 9 for Figure 7 Bottom view of .

[0034] Explanation of the accompanying drawings: 1-box, 2-side panel, 3-shielding member, 4-fan, 1a-vent, 1b-sealing strip, 5-shell, 6-filter, 31-middle orifice plate, 32-lower push rod, 33-lower orifice plate, 34-upper push rod, 35-upper orifice plate, 101-storage box, 102-air bag, 201-U-shaped connecting plate, 202-translation assembly, 203-cutter, 204-baffle, 301-blowing pipe. DETAILED DESCRIPTION

[0035] The following further describes the technical solution with reference to specific embodiments. It should be noted that terms such as "up," "down," "left," and "right" used herein to indicate directions refer only to the positions of the structures depicted in the corresponding drawings. Component numbers, such as "first" and "second," are used solely to distinguish the components being described and do not convey any sequential or technical meaning. References to "connected" and "coupled" in this application, unless otherwise specified, include both direct and indirect connections (couplings).

[0036] Example 1: A flexible grid-connected box for distributed photovoltaics, such as Figures 1-9 As shown, it includes a box body 1, a side panel 2, a shielding member 3 and a fan 4;

[0037] A vent 1a is provided at the lower left and 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 the inner right part 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 vent 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 vent 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 supply air upward or downward; the air in the left channel and the right channel interact in the box body 1 through the through holes of the shielding member 3; a shell 5 is fixedly connected to the lower side of the left vent 1a and the right vent 1a; a filter element 6 is detachably connected to the shell 5; a sealing strip 1b is provided on the door of the box body 1.

[0038] The present invention is proposed to overcome the problems in the prior art where ventilation holes of the grid-connected box are set on both sides, which easily allow water to enter on rainy days, and where moist air enters the grid-connected box during heat exchange in a humid environment, which may cause damage to components.

[0039] First, the present invention sets the vent 1a at the bottom of the box body 1 and faces downward, thereby overcoming the problem of water easily entering the box body 1 when the vent is set on both sides of the box body 1 in the prior art;

[0040] Secondly, if Figure 2 As shown, the left figure shows a clockwise air circulation, in which the left fan 4 blows air upwards. After the wind enters the left channel, it enters the box body 1 through the through hole of the left shielding member 3. At the same time, the right fan 4 blows air downwards, sucking the air in the box body 1 to the right channel and transferring it to the outside through the right vent 1a. It should be noted that when the left fan 4 blows air to the left channel, the outside air passes through the left filter element 6, and the water vapor and impurities in the outside air are filtered by the left filter element 6, so that the air entering the box body 1 is clean and dry. At the same time, the wind sent to the outside from the right channel and the right vent 1a will blow the right filter element 6 to dry it, and blow away the debris intercepted at its bottom, thereby realizing self-cleaning of the filter element 6. Furthermore, the operation of the components in the box body 1 will generate heat, so that the wind sent to the outside from the right channel and the right vent 1a has a certain temperature, thereby improving the drying effect of the right filter element 6. When the present invention is operated according to Figure 2 After the clockwise air circulation mode in the middle left figure has been running for a period of time, the present invention can be controlled to Figure 2 The counterclockwise air circulation mode in the middle right figure runs for a period of time; such circulation allows the air to circulate clockwise and counterclockwise in the present invention, so that the air entering the box body 1 is clean and dry. At the same time, one of the filter elements 6 is dried and backblown at all times to maintain the filtering effect, thereby overcoming the problem of moist air entering the grid box in the prior art.

[0041] Furthermore, when a worker is inspecting the present invention and needs to open the door of the box body 1, both fans 4 can be controlled to supply air into the box body 1, such as Figure 3 As shown in the middle left figure, the air pressure in the box body 1 is increased, which makes it easier for workers to open the box door and avoids the difficulty of opening the box door due to the sealing strip 1b, which makes it unsafe for workers to work at height. When the worker completes the inspection and needs to close the box door, the two fans 4 can be controlled to blow air downward to suck the air in the box body 1 to the outside. Figure 3 As shown in the middle right figure, the air pressure in the box body 1 becomes smaller, forming a negative pressure, which allows the sealing strip 1b to fit tightly, ensuring the airtightness of the box body 1.

[0042] Example 2: Based on Example 1, Figures 1-9As shown, the shielding member 3 includes 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 part 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 part 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 part 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.

[0043] When the lower orifice plate 33 , the upper orifice plate 35 and the middle orifice plate 31 are attached, 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 .

[0044] Progress, such as Figure 4-Figure 6 As shown, when the present invention works in a low temperature environment, in order to prevent the components in the box body 1 from being unable to work due to the low temperature, the present invention controls the lower push rod 32 to push the lower hole plate 33 to move upward, and the upper push rod 34 to push the upper hole plate 35 to move downward, so that the shielding member 3 of the present invention is moved from Figure 6 Status changes to Figure 5 State, at this time, the lower orifice plate 33, the upper orifice plate 35 and the middle orifice plate 31 are in contact, and 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; during this process, the fan 4 also moves synchronously with the lower orifice plate 33; then the left fan 4 is controlled to blow air upwards, and the right fan 4 is controlled to blow air downwards. At the same time, the heating module in the fan 4 is activated, so that a clockwise hot air flow is generated in the box body 1, thereby heating the components in the box body 1 to prevent them from being unable to operate due to low temperatures. In addition, a temperature sensor is set in the box body 1 to control whether the heating module is working and the working power.

[0045] Example 3: Based on Example 2, Figures 1-9 As shown, one side of the housing 5 is connected to a storage box 101 ; an air bag 102 is installed in the storage box 101 ; the filter element 6 in the storage box 101 is pushed and moved by the air bag 102 .

[0046] A U-shaped connecting plate 201 is fixed to the bottom of the box body 1; a translation assembly 202 is installed on the U-shaped connecting plate 201; a cutter 203 is detachably connected to the moving part of the translation assembly 202, and the filter element 6 floating out of the shell 5 is cut off by the cutter 203.

[0047] One side of the U-shaped connecting plate 201 is detachably connected to a baffle 204 , which shields and protects the cutter 203 .

[0048] The housing 5 further includes a blowing pipe 301 , which is installed at the bottom of the housing 5 , and air is blown toward the bottom of the filter element 6 through the blowing pipe 301 .

[0049] Furthermore, the filter element 6 is a sponge. When a large amount of dust remains in the pores of the sponge, the filtering effect will be affected. Based on this problem, the present invention can control the inflation of the airbag 102 to drive the filter element 6 stored in the storage box 101 to move, so that the new part of the filter element 6 is transferred to the bottom of the vent 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 component 202 to drive the cutter 203 to move, the old part of the filter element 6 with a large amount of dust adsorbed is cut off, thereby ensuring the filtering effect of the filter element 6.

[0050] Furthermore, the outside air contains not only dust but also some large and light debris such as leaves and plastic bags. When the large and light debris are sucked to the bottom of the filter element 6, the air intake effect of the filter element 6 will be seriously affected, so that the air entering the box body 1 is not as expected. To address this problem, the present invention provides a blowing pipe 301, which blows air to the bottom of the filter element 6 through the blowing pipe 301 to blow away the large and light debris adsorbed on the bottom of the filter element 6.

[0051] It should be understood that this embodiment is only used to illustrate the present invention and is not used 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 fall equally within the scope limited by the appended claims of the 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 communicated with 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 communicated 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, and the fan (4) can supply air upward or downward; the air in the left channel and the right channel interacts in the box body (1) through the through hole of the shielding member (3); A housing (5) is fixedly connected to the lower side of each of the left vent (1a) and the right vent (1a); a filter element (6) is detachably connected to the inside of the housing (5); The shielding member (3) includes 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; When the lower orifice plate (33), the upper orifice plate (35) and the middle orifice plate (31) are attached, 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); One side of the housing (5) is connected to a storage box (101); an air bag (102) is installed in the storage box (101); the filter element (6) in the storage box (101) is pushed and moved by the air bag (102); 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 moving part of the translation assembly (202).

2. 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).

3. A flexible grid-connected box for distributed photovoltaics according to claim 1, characterized in that: A baffle (204) is detachably connected to one side of the U-shaped connecting plate (201).

4. A flexible grid-connected box for distributed photovoltaics according to claim 1, characterized in that: It also includes a blowing pipe (301), and the blowing pipe (301) is installed at the bottom of the shell (5).

5. A method for using the grid-connected box according to any one of claims 3-4, 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 heat dissipation mode, the grid-connected box is controlled to work alternately between clockwise external circulation mode and counterclockwise external circulation mode; When workers are inspecting and opening the box door, the grid-connected box is controlled to operate in boosting mode; When workers are inspecting and closing the box door, the grid box is controlled to work in negative pressure mode; In low temperature environment, the grid-connected box is controlled to operate in clockwise internal circulation mode.

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