A box-type photovoltaic inverter and control method thereof

Abstract

The present invention discloses a box-type photovoltaic inverter and a control method thereof, which relates to the technical field of photovoltaic power generation devices, and comprises a protection box, wherein the bottom of the inner cavity of the protection box is provided with an internal circulation heat dissipation mechanism, the top of the inner cavity of the protection box is provided with a fire alarm mechanism, the bottom of the protection box is provided with a static elimination mechanism, and the internal circulation heat dissipation mechanism comprises a vertical pipe, and the vertical pipe is fixedly connected to the bottom of the protection box. The present invention drives the air in the inner cavity of the protection box to circulate internally through the inner cavity of the cooling pipe by controlling the operation of the circulation fan, and controls the operation of the semiconductor refrigerator at the same time, and cools the air passing through the inner cavity of the cooling pipe through the heat transfer of the graphite plate and the temperature exchange block, that is, realizes the internal circulation heat dissipation of the photovoltaic inverter body, increases the heat dissipation efficiency, and avoids the problem that the external humid air affects the photovoltaic inverter body.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic power generation devices, and in particular to a box-type photovoltaic inverter and a control method thereof. Background Art

[0002] Photovoltaic power generation is a technology that uses the photovoltaic effect of semiconductor interfaces to directly convert light energy into electrical energy. It is mainly composed of three parts: solar panels, controllers and inverters. The main components are composed of electronic components. Solar cells are packaged and protected after being connected in series to form large-area solar cell modules. Combined with power controllers and other components, a photovoltaic power generation device is formed. Photovoltaic inverters can convert the variable DC voltage generated by photovoltaic solar panels into AC power with mains frequency, which can be fed back to commercial power transmission systems or used for off-grid power grids. Photovoltaic inverters are one of the important system balances in photovoltaic array systems and can be used with general AC-powered equipment. Solar inverters have special functions for photovoltaic arrays, such as maximum power point tracking and islanding effect protection. The following problems exist in the existing technology:

[0003] 1. The existing box-type photovoltaic inverter does not have the function of efficient heat dissipation. It only dissipates heat by opening heat dissipation holes on the outer wall of the box. The heat dissipation efficiency is low, and the humid air outside can easily affect the safety of the components inside the box, which needs to be improved urgently;

[0004] 2. Existing box-type photovoltaic inverters do not have the function of self-alarm in case of fire. After long-term use of the photovoltaic power generation system, its internal components will age and be damaged, which can easily lead to overload operation of the photovoltaic inverter and cause fire. If the user cannot be informed and deal with it in time, the fire will spread further, posing a threat to the life and property safety of nearby people. Summary of the invention

[0005] The present invention provides a box-type photovoltaic inverter and a control method thereof, one of the purposes of which is to have a function of efficient heat dissipation to solve the problem of low efficiency of heat dissipation only by opening heat dissipation holes; another purpose is to solve the problem that users cannot be informed and deal with the fire in time, which may lead to further spread of the fire, so as to achieve the effect of automatic alarm in case of fire.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] In the first aspect, the present invention provides a box-type photovoltaic inverter, including a protective box body, an internal circulation heat dissipation mechanism is arranged at the bottom of the inner cavity of the protective box body, a fire alarm mechanism is arranged at the top of the inner cavity of the protective box body, and a static elimination mechanism is arranged at the bottom of the protective box body. The internal circulation heat dissipation mechanism includes a vertical through pipe, which is fixedly connected to the bottom of the protective box body, and a cooling pipe is fixedly connected to one side adjacent to the two vertical through pipes, and graphite plates are fixedly installed on the front and back sides of the cooling pipes, a semiconductor refrigerator is fixedly installed on the side of the graphite plate away from the cooling pipe, and a temperature exchange block is fixedly connected to the inner side of the graphite plate, and the fire alarm mechanism includes a temperature monitoring box, which is fixedly installed on the top of the inner cavity of the protective box body, and a Wood's alloy fuse is fixedly installed on the top of the inner cavity of the temperature monitoring box.

[0008] A further improvement of the technical solution of the present invention is that a vertical frame is fixedly installed on the top of the inner cavity of the protection box body, a photovoltaic inverter body is fixedly installed on the top of the vertical frame, an indicator light is fixedly installed on the front of the protection box body, a mounting plate is fixedly installed on the back of the protection box body, the internal circulation heat dissipation mechanism also includes a circulation fan, a rotating connecting pipe and a rotating motor, the circulation fan is fixedly installed on the bottom of the inner cavity of the protection box body, the rotating connecting pipe is fixedly connected to the bottom of the inner cavity of the protection box body, the rotating motor is fixedly installed on the bottom of the inner cavity of the protection box body and is located on the right side of the rotating connecting pipe, the top of the rotating connecting pipe is rotatably connected to a hollow load-bearing cylinder, a transmission gear ring is fixedly installed on the outer wall of the hollow load-bearing cylinder, the output shaft of the rotating motor is fixedly installed with a transmission gear, and the right side of the transmission gear ring is meshed with the left side of the transmission gear.

[0009] A further improvement of the technical solution of the present invention is that a bent pipe is fixedly connected to the left side of the hollow load-bearing cylinder, a cooling arc plate is fixedly connected to the top of the bent pipe, a hollow groove is opened inside the cooling arc plate, an extension pipe is fixedly connected to the inner wall of the cooling arc plate, and a cutting wind hood is fixedly installed on the outer wall of the extension pipe.

[0010] A further improvement of the technical solution of the present invention is that an exchange groove is opened on the left side of the temperature exchange block, extension frames are fixedly welded on the top and bottom of the temperature exchange block, an arc groove is opened on the left side of the temperature exchange block, a through tube is fixedly installed on the right side of the temperature exchange block, and an inner extending wing is fixedly welded on the inner wall of the through tube.

[0011] A further improvement of the technical solution of the present invention is that the fire alarm mechanism also includes a hot air capture tube, which is fixedly installed on both sides of the inner cavity of the protection box, and the bottom end of the hot air capture tube is fixedly connected with a capture cover, the bottom of the Wood's alloy fuse is fixedly connected with a movable plate, and the bottom of the movable plate is fixedly installed with a counterweight block, both sides of the inner cavity of the temperature monitoring box are fixedly connected with a focusing cone, the bottom of the temperature monitoring box is fixedly installed with a bottom bracket, and the top of the bottom bracket is fixedly installed with an alarm box body.

[0012] A further improvement of the technical solution of the present invention is that: a spring is fixedly installed on the top of the alarm box body, a T-shaped plate is fixedly installed on the top of the spring, the bottom of the T-shaped plate extends into the inner cavity of the alarm box body, a battery body is fixedly installed on the left side of the inner cavity of the alarm box body, a wireless signal sending device is fixedly installed on the right side of the inner cavity of the alarm box body, a controller body is fixedly installed on the bottom of the inner cavity of the alarm box body, a single-trigger switch located at the top of the controller body is fixedly installed on the bottom of the inner cavity of the alarm box body, an electrical signal connection is made between the single-trigger switch and the controller body, and an electrical signal connection is made between the controller body and the wireless signal sending device.

[0013] A further improvement of the technical solution of the present invention is that the static elimination mechanism includes an insulating mounting frame, which is detachably connected to the bottom of the protective box, an elastic pad is fixedly installed at the bottom of the inner cavity of the insulating mounting frame, a conductive patch is fixedly installed on the top of the elastic pad, the top of the conductive patch is movably connected to the bottom of the protective box, and the bottom of the conductive patch is fixedly connected to a conductive wire.

[0014] A further improvement of the technical solution of the present invention is that: the bottom of the conductive wire is fixedly connected to a ground disc, the bottom of the ground disc is fixedly welded with a main rod, the outer wall of the main rod is fixedly welded with a branch guide rod, the ends of the main rod and the branch guide rod are fixedly welded with diffusion rings, and the outer wall of the diffusion ring is fixedly welded with a tree-shaped rod.

[0015] A further improvement of the technical solution of the present invention is that: an anti-corrosion layer 1 is arranged on the outer wall of the conductive wire, an anti-corrosion layer 2 is arranged on the outer wall of the anti-corrosion layer 1, and an anti-weathering layer is arranged on the outer wall of the anti-corrosion layer 2.

[0016] In a second aspect, the present invention further provides a control method for a box-type photovoltaic inverter, the control method for the box-type photovoltaic inverter comprising the following steps:

[0017] S1. Substation control: The photovoltaic inverter is pre-connected to the photovoltaic power generation system of the solar panel. When the solar panel is working, the photovoltaic effect can be used to directly convert light energy into electrical energy. Through the operation of the photovoltaic inverter, the variable DC voltage generated by the solar panel is converted into AC power with the main power frequency, and finally fed back to the commercial power transmission system, thus completing the substation control.

[0018] S2. Heat dissipation control: Control the circulation fan to drive the air in the inner cavity of the protection box to circulate through the inner cavity of the cooling tube, and control the semiconductor refrigerator to cool the air passing through the inner cavity of the cooling tube through heat transfer between the graphite plate and the temperature exchange block. Finally, control the rotary motor to drive the cooling arc plate to rotate around the photovoltaic inverter body, so that the cooled gas is evenly blown to the surface of the photovoltaic inverter body, so as to achieve efficient heat dissipation of the photovoltaic inverter body.

[0019] S3. Fire self-alarm control: If the photovoltaic inverter body catches fire due to short circuit or other reasons, the flame will cause the temperature of the inner cavity of the protection box to rise rapidly, and the Wood alloy fuse will automatically melt in the high temperature environment, thereby releasing the fixation of the movable plate, and the movable plate will then fall freely. Under the influence of the gravity of the counterweight block, the T-plate will be effectively pressed down, prompting the single-trigger switch to receive the downward pressure information and transmit this signal to the controller body. The controller body then controls the wireless signal sending device to work, and finally transmits the fire information to the staff's portable equipment through the wireless signal sending device, thus completing the fire self-alarm control.

[0020] Due to the adoption of the above technical solution, the present invention has the following technical advances compared with the prior art:

[0021] 1. The present invention provides a box-type photovoltaic inverter and a control method thereof, which adopts a combination of a circulating fan, a vertical pipe, a cooling pipe, a graphite plate, a semiconductor refrigerator and a temperature exchange block. The circulating fan is controlled to drive the air in the inner cavity of the protection box to circulate internally through the inner cavity of the cooling pipe. At the same time, the semiconductor refrigerator is controlled to operate, and the air passing through the inner cavity of the cooling pipe is cooled by heat transfer through the graphite plate and the temperature exchange block, that is, the photovoltaic inverter body is internally circulated to dissipate heat, the efficiency of heat dissipation is increased, and the problem of the external humid air affecting the photovoltaic inverter body is avoided. In addition, the contact rate between the air and the temperature exchange block is increased through the design of the exchange slot, the extension frame and the inner extension wing, and the heat dissipation effect is further improved.

[0022] 2. The present invention provides a box-type photovoltaic inverter and a control method thereof, which adopts a combination of Wood's alloy fuse, movable plate, counterweight, single-shot trigger switch and wireless signal sending device. If the photovoltaic inverter body catches fire, the fire will cause the air temperature in the inner cavity of the protective box to rise rapidly. The Wood's alloy fuse will automatically melt when heated to the melting point by hot air, and the fixation of the movable plate will be released. The movable plate will then fall freely, and under the influence of the gravity acceleration of the counterweight, the T-plate will be effectively pressed down, so that the single-shot trigger switch receives the downward pressure information and transmits this signal to the controller body. The controller body then controls the wireless signal sending device to work, and finally transmits the fire information to the staff's portable equipment through the wireless signal sending device, so that the staff can make corresponding treatment in time to avoid the problem of further spread of the fire, thereby improving the safety of the device.

[0023] 3. The present invention provides a box-type photovoltaic inverter and a control method thereof, which adopts a combination of a rotary motor, a transmission gear, a transmission gear ring, a cooling arc plate, an extension tube and a cutting hood. While controlling the circulating fan and the semiconductor refrigerator to dissipate heat, the rotary motor is controlled to drive the transmission gear to rotate, and the hollow load-bearing cylinder is driven to rotate on the top of the rotating connecting tube through the transmission of the transmission gear ring. At the same time, the cooling arc plate is caused to rotate around the photovoltaic inverter body, so that the cooled gas is evenly blown to the surface of the photovoltaic inverter body, thereby realizing efficient heat dissipation of the photovoltaic inverter body. Moreover, through the design of the cutting hood, the air sprayed from the extension tube can be cut, so that the air is more evenly blown to the photovoltaic inverter body.

[0024] 4. The present invention provides a box-type photovoltaic inverter and a control method thereof, which adopts a combination of an insulating mounting frame, an elastic pad, a conductive patch, a conductive wire, a diffusion ring and a tree-shaped rod. The insulating mounting frame is pre-installed on the bottom of the protective box and the bottom of the ground disc is buried in the ground. The elastic pad is designed to make the top of the conductive patch fit with the bottom of the protective box. The static electricity naturally generated on the protective box or the static electricity carried to the protective box by the human body will be transferred to the conductive wire through the conductive patch, and then transferred to the ground disc through the conductive wire, and finally released to the ground through the diffusion ring and the tree-shaped rod, thereby avoiding the problem of static electricity causing damage to the components inside the photovoltaic inverter body, extending the service life of the photovoltaic inverter body, and improving the safety of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Figure 2 This is a schematic diagram of the internal structure of the protection box of the present invention;

[0027] Figure 3 It is an enlarged schematic diagram of structure A of the present invention;

[0028] Figure 4 It is a schematic diagram of the side cross-sectional structure of the cooling tube of the present invention;

[0029] Figure 5 It is a structural schematic diagram of the temperature exchange block of the present invention;

[0030] Figure 6 It is a schematic cross-sectional structure diagram of the cooling arc plate of the present invention;

[0031] Figure 7 It is a schematic diagram of the internal structure of the temperature monitoring box of the present invention;

[0032] Figure 8 It is a schematic diagram of the internal structure of the alarm box body of the present invention;

[0033] Fig. 9 It is a structural schematic diagram of the static elimination mechanism of the present invention;

[0034] Fig.10 It is a schematic diagram of the cross-sectional structure of the conductive wire of the present invention.

[0035] In the figure: 1. Protective box; 11. Vertical frame; 12. PV inverter body; 2. Indicator light; 3. Mounting plate;

[0036] 4. Internal circulation heat dissipation mechanism; 41. Vertical through pipe; 411. Cooling pipe; 412. Graphite plate; 413. Semiconductor refrigerator; 414. Temperature exchange block; 4141. Exchange slot; 4142. Extension frame; 4143. Arc slot; 4144. Through pipe; 4145. Inner extended wing; 42. Circulation fan; 43. Rotating connecting pipe; 44. Hollow load-bearing cylinder; 45. Rotating motor; 46. Transmission gear; 47. Transmission gear ring; 48. Bend pipe; 49. Cooling arc plate; 491. Hollow slot; 492. Extension pipe; 493. Cutting wind hood;

[0037] 5. Fire alarm mechanism; 51. Hot air capture tube; 52. Capture cover; 53. Temperature monitoring box; 531. Wood's alloy fuse; 532. Movable plate; 533. Counterweight; 534. Concentrating cone; 535. Bottom bracket; 536. Alarm box body; 5361. Spring; 5362. T-plate; 5363. Battery body; 5364. Wireless signal sending device; 5365. Single trigger switch; 5366. Controller body;

[0038] 6. Static electricity elimination mechanism; 61. Insulation installation frame; 62. Elastic pad; 63. Conductive patch; 64. Conductive wire; 641. Anti-corrosion layer one; 642. Anti-corrosion layer two; 643. Anti-weathering layer; 65. Ground disc; 651. Main rod; 652. Branch guide rod; 653. Diffusion ring; 654. Tree-shaped rod. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below in conjunction with embodiments:

[0040] Example 1

[0041] First, as Figure 1-10 As shown, the present invention provides a box-type photovoltaic inverter, including a protection box 1, an internal circulation heat dissipation mechanism 4 is arranged at the bottom of the inner cavity of the protection box 1, a fire alarm mechanism 5 is arranged at the top of the inner cavity of the protection box 1, and a static elimination mechanism 6 is arranged at the bottom of the protection box 1. The internal circulation heat dissipation mechanism 4 includes a vertical pipe 41, the vertical pipe 41 is fixedly connected to the bottom of the protection box 1, and a cooling pipe 411 is fixedly connected to one side adjacent to the two vertical pipes 41, and a graphite plate 412 is fixedly installed on the front and back of the cooling pipe 411, a semiconductor refrigerator 413 is fixedly installed on the side of the graphite plate 412 away from the cooling pipe 411, and a temperature exchange block 414 is fixedly connected to the inner side of the graphite plate 412, and the fire alarm mechanism 5 includes a temperature monitoring box 53, the temperature monitoring box 53 is fixedly installed on the top of the inner cavity of the protection box 1, and a Wood's alloy fuse 531 is fixedly installed on the top of the inner cavity of the temperature monitoring box 53.

[0042] In this embodiment, the semiconductor refrigerator 413 is controlled to work, and the air passing through the inner cavity of the cooling tube 411 is cooled by heat transfer through the graphite plate 412 and the temperature exchange block 414. The Wood's alloy fuse 531 can automatically melt at a certain temperature, which is convenient for the subsequent fire alarm work.

[0043] Example 2

[0044] like Figure 1-10 As shown, on the basis of Example 1, the present invention provides a technical solution: preferably, a vertical frame 11 is fixedly installed on the top of the inner cavity of the protection box 1, a photovoltaic inverter body 12 is fixedly installed on the top of the vertical frame 11, an indicator light 2 is fixedly installed on the front of the protection box 1, a mounting plate 3 is fixedly installed on the back of the protection box 1, and the internal circulation heat dissipation mechanism 4 also includes a circulation fan 42, a rotating connecting pipe 43 and a rotating motor 45, the circulation fan 42 is fixedly installed at the bottom of the inner cavity of the protection box 1, the rotating connecting pipe 43 is fixedly connected to the bottom of the inner cavity of the protection box 1, the rotating motor 45 is fixedly installed at the bottom of the inner cavity of the protection box 1 and is located on the right side of the rotating connecting pipe 43, the top of the rotating connecting pipe 43 is rotatably connected with a hollow load-bearing cylinder 44, a transmission gear ring 47 is fixedly installed on the outer wall of the hollow load-bearing cylinder 44, and a transmission gear ring 47 is fixedly installed on the output shaft of the rotating motor 45. The right side of the transmission gear ring 47 is meshed with the left side of the transmission gear 46.

[0045] A curved pipe 48 is fixedly connected to the left side of the hollow load-bearing cylinder 44, a cooling arc plate 49 is fixedly connected to the top of the curved pipe 48, a hollow groove 491 is provided inside the cooling arc plate 49, an extension pipe 492 is fixedly connected to the inner wall of the cooling arc plate 49, and a cutting wind hood 493 is fixedly installed on the outer wall of the extension pipe 492.

[0046] In this embodiment, the circulation fan 42 is controlled to drive the air in the inner cavity of the protection box 1 to circulate through the inner cavity of the cooling tube 411, and the rotation motor 45 is controlled to drive the transmission gear 46 to rotate. The hollow load-bearing cylinder 44 is driven to rotate on the top of the rotating connecting tube 43 through the transmission of the transmission gear ring 47, and the cooling arc plate 49 is prompted to rotate around the photovoltaic inverter body 12, so that the cooled gas is evenly blown to the surface of the photovoltaic inverter body 12, so as to achieve efficient heat dissipation of the photovoltaic inverter body 12, and through the design of the cutting wind hood 493, the air sprayed from the extension tube 492 can be cut, so that the air is more evenly blown to the photovoltaic inverter body 12.

[0047] An exchange groove 4141 is provided on the left side of the temperature exchange block 414, extension frames 4142 are fixedly welded on the top and bottom of the temperature exchange block 414, an arc groove 4143 is provided on the left side of the temperature exchange block 414, a through tube 4144 is fixedly installed on the right side of the temperature exchange block 414, and an inner extending wing 4145 is fixedly welded on the inner wall of the through tube 4144.

[0048] Through the design of the graphite plate 412, the temperature of the cold end of the semiconductor refrigerator 413 can be quickly transferred to the temperature exchange block 414. Through the design of the exchange groove 4141 and the extension frame 4142, the contact efficiency between the flowing air and the temperature exchange block 414 is improved, thereby increasing the heat dissipation rate. Through the design of the arc groove 4143, the flowing air can be captured and flow through the inner cavity of the tube 4144, and the cooling effect is accelerated through the inner extended wing 4145.

[0049] Example 3

[0050] like Figure 1-10 As shown, on the basis of Example 1, the present invention provides a technical solution: preferably, the fire alarm mechanism 5 also includes a hot air capture tube 51, the hot air capture tube 51 is fixedly installed on both sides of the inner cavity of the protection box body 1, the bottom end of the hot air capture tube 51 is fixedly connected with a capture cover 52, the bottom of the Wood's alloy fuse 531 is fixedly connected with a movable plate 532, the bottom of the movable plate 532 is fixedly installed with a counterweight block 533, both sides of the inner cavity of the temperature monitoring box 53 are fixedly connected with a focusing cone 534, the bottom of the temperature monitoring box 53 is fixedly installed with a bottom bracket 535, and the top of the bottom bracket 535 is fixedly installed with an alarm box body 536.

[0051] A spring 5361 is fixedly installed on the top of the alarm box body 536, a T-shaped plate 5362 is fixedly installed on the top of the spring 5361, the bottom of the T-shaped plate 5362 extends into the inner cavity of the alarm box body 536, a battery body 5363 is fixedly installed on the left side of the inner cavity of the alarm box body 536, a wireless signal sending device 5364 is fixedly installed on the right side of the inner cavity of the alarm box body 536, a controller body 5366 is fixedly installed on the bottom of the inner cavity of the alarm box body 536, a single-trigger switch 5365 located on the top of the controller body 5366 is fixedly installed on the bottom of the inner cavity of the alarm box body 536, the single-trigger switch 5365 and the controller body 5366 are electrically connected, and the controller body 5366 and the wireless signal sending device 5364 are electrically connected.

[0052] In this embodiment, through the cooperation of the hot air capture tube 51 and the capture cover 52, the flowing air in the protection box 1 can be captured, and then quickly transported to the inner cavity of the temperature monitoring box 53, thereby accelerating the efficiency of the Wood's alloy fuse 531 being heated by the air and improving the timeliness of the alarm. Through the design of the focusing cone 534, the air captured by the hot air capture tube 51 and the capture cover 52 is blown to the middle of the Wood's alloy fuse 531, further increasing the speed at which the Wood's alloy fuse 531 is blown. If the photovoltaic inverter body 12 catches fire, the fire will cause the air temperature in the inner cavity of the protection box 1 to rise rapidly, and the Wood When the alloy fuse 531 is heated to the melting point by the hot air, it automatically melts, and the fixation of the movable plate 532 is released. The movable plate 532 then falls freely, and under the influence of the gravity acceleration of the counterweight block 533, it will effectively press down on the T-plate 5362, so that the single trigger switch 5365 receives the downward pressure information and transmits this signal to the controller body 5366. The controller body 5366 then controls the wireless signal sending device 5364 to work, and finally transmits the fire information to the staff's portable equipment through the wireless signal sending device 5364, so that the staff can take corresponding measures in time.

[0053] Example 4

[0054] like Figure 1-10 As shown, on the basis of Example 1, the present invention provides a technical solution: preferably, the static elimination mechanism 6 includes an insulating mounting frame 61, the insulating mounting frame 61 is detachably connected to the bottom of the protective box 1, an elastic pad 62 is fixedly installed at the bottom of the inner cavity of the insulating mounting frame 61, a conductive patch 63 is fixedly installed on the top of the elastic pad 62, the top of the conductive patch 63 is movably connected to the bottom of the protective box 1, and the bottom of the conductive patch 63 is fixedly connected to a conductive wire 64.

[0055] The bottom of the conductive wire 64 is fixedly connected to a ground disc 65, a main rod 651 is fixedly welded to the bottom of the ground disc 65, a branch guide rod 652 is fixedly welded to the outer wall of the main rod 651, a diffusion ring 653 is fixedly welded to the ends of the main rod 651 and the branch guide rod 652, a tree-shaped rod 654 is fixedly welded to the outer wall of the diffusion ring 653, an anti-corrosion layer 1 641 is provided on the outer wall of the conductive wire 64, an anti-corrosion layer 2 642 is provided on the outer wall of the anti-corrosion layer 1 641, and an anti-weathering layer 643 is provided on the outer wall of the anti-corrosion layer 2 642.

[0056] In this embodiment, the insulating mounting frame 61 is pre-installed on the bottom of the protective box 1 and the bottom of the ground disc 65 is buried in the ground. The elastic pad 62 is designed to make the top of the conductive patch 63 fit with the bottom of the protective box 1. The static electricity naturally generated on the protective box 1 or the static electricity carried to the protective box 1 by the human body will be transferred to the conductive wire 64 through the conductive patch 63, and then transferred to the ground disc 65 through the conductive wire 64, and finally released to the ground through the diffusion ring 653 and the tree-shaped rod 654, so as to avoid the problem of static electricity causing damage to the components inside the photovoltaic inverter body 12. The material of the anti-corrosion layer 1 641 is set to epoxy resin, and the material of the anti-corrosion layer 2 642 is set to polyethylene. Through the design of the anti-corrosion layer 2 642 and the anti-weathering layer 643, the anti-corrosion performance of the outer wall of the conductive wire 64 is improved, and the service life of the conductive wire 64 is extended. Through the design of the anti-weathering layer 643, the outer wall of the conductive wire 64 is wrapped and protected to reduce the damage caused by weathering factors, thereby effectively ensuring the normal operation of the static electricity removal function.

[0057] Example 5

[0058] Second, as Figure 1-10 As shown, the present invention also provides a control method for a box-type photovoltaic inverter, and the control method for the box-type photovoltaic inverter comprises the following steps:

[0059] S1, power conversion control: the photovoltaic inverter body 12 is pre-connected to the photovoltaic power generation system of the solar panel. When the solar panel is working, the photovoltaic effect can be used to directly convert light energy into electrical energy. Through the operation of the photovoltaic inverter body 12, the variable DC voltage generated by the solar panel is converted into AC power of the main power frequency, and finally fed back to the commercial power transmission system, that is, the power conversion control is completed;

[0060] S2, heat dissipation control: control the circulation fan 42 to drive the air in the inner cavity of the protection box 1 to circulate through the inner cavity of the cooling tube 411, and control the semiconductor refrigerator 413 to cool the air passing through the inner cavity of the cooling tube 411 through heat transfer through the graphite plate 412 and the temperature exchange block 414, and finally control the rotary motor 45 to drive the cooling arc plate 49 to rotate around the photovoltaic inverter body 12, so that the cooled gas is evenly blown to the surface of the photovoltaic inverter body 12, so as to achieve efficient heat dissipation of the photovoltaic inverter body 12;

[0061] S3. Fire self-alarm control: If the photovoltaic inverter body 12 catches fire due to a short circuit or the like, the flame will cause the temperature of the inner cavity of the protection box 1 to rise rapidly, and the Wood's alloy fuse 531 will automatically blow in a high temperature environment, thereby releasing the fixation of the movable plate 532, and the movable plate 532 will then fall freely. Under the influence of the gravity of the counterweight block 533, the T-plate 5362 will be effectively pressed down, prompting the single trigger switch 5365 to receive the downward pressure information and transmit this signal to the controller body 5366. The controller body 5366 then controls the wireless signal sending device 5364 to work, and finally transmits the fire information to the staff's portable equipment through the wireless signal sending device 5364, thus completing the fire self-alarm control.

[0062] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A box-type photovoltaic inverter, comprising a protective box (1), characterized in that: An internal circulation heat dissipation mechanism (4) is arranged at the bottom of the inner cavity of the protection box (1), a fire alarm mechanism (5) is arranged at the top of the inner cavity of the protection box (1), and a static electricity elimination mechanism (6) is arranged at the bottom of the protection box (1). The internal circulation heat dissipation mechanism (4) comprises a vertical pipe (41), the vertical pipe (41) is fixedly connected to the bottom of the protection box (1), and a cooling pipe (411) is fixedly connected to one side adjacent to the two vertical pipes (41), and the front and rear surfaces of the cooling pipe (411) are connected to the cooling pipe (411). A graphite plate (412) is fixedly mounted on the back side, a semiconductor refrigerator (413) is fixedly mounted on the side of the graphite plate (412) away from the cooling tube (411), a temperature exchange block (414) is fixedly connected to the inner side of the graphite plate (412), the fire alarm mechanism (5) comprises a temperature monitoring box (53), the temperature monitoring box (53) is fixedly mounted on the top of the inner cavity of the protection box (1), and a Wood's alloy fuse (531) is fixedly mounted on the top of the inner cavity of the temperature monitoring box (53); A vertical frame (11) is fixedly mounted on the top of the inner cavity of the protection box (1), a photovoltaic inverter body (12) is fixedly mounted on the top of the vertical frame (11), an indicator light (2) is fixedly mounted on the front of the protection box (1), and a mounting plate (3) is fixedly mounted on the back of the protection box (1). The internal circulation heat dissipation mechanism (4) further comprises a circulation fan (42), a rotating connecting pipe (43) and a rotating motor (45), wherein the circulation fan (42) is fixedly mounted on the bottom of the inner cavity of the protection box (1), and the rotating connecting pipe (43) is fixedly mounted on the bottom of the inner cavity of the protection box (1). The connecting pipe (43) is fixedly connected to the bottom of the inner cavity of the protection box (1); the rotary motor (45) is fixedly mounted at the bottom of the inner cavity of the protection box (1) and is located on the right side of the rotary connecting pipe (43); the top of the rotary connecting pipe (43) is rotatably connected to a hollow load-bearing cylinder (44); a transmission gear ring (47) is fixedly mounted on the outer wall of the hollow load-bearing cylinder (44); a transmission gear (46) is fixedly mounted on the output shaft of the rotary motor (45); and the right side of the transmission gear ring (47) meshes with the left side of the transmission gear (46); A curved pipe (48) is fixedly connected to the left side of the hollow load-bearing cylinder (44); a cooling arc plate (49) is fixedly connected to the top of the curved pipe (48); a hollow groove (491) is provided inside the cooling arc plate (49); an extension pipe (492) is fixedly connected to the inner wall of the cooling arc plate (49); and a cutting air hood (493) is fixedly installed on the outer wall of the extension pipe (492); An exchange groove (4141) is provided on the left side of the temperature exchange block (414); an extension frame (4142) is fixedly welded to the top and bottom of the temperature exchange block (414); an arc groove (4143) is provided on the left side of the temperature exchange block (414); a through tube (4144) is fixedly installed on the right side of the temperature exchange block (414); and an inner extension wing (4145) is fixedly welded to the inner wall of the through tube (4144); The fire alarm mechanism (5) further comprises a hot air capture tube (51), wherein the hot air capture tube (51) is fixedly mounted on both sides of the inner cavity of the protection box (1), a capture cover (52) is fixedly connected to the bottom end of the hot air capture tube (51), a movable plate (532) is fixedly connected to the bottom of the Wood's alloy fuse (531), a counterweight (533) is fixedly mounted to the bottom of the movable plate (532), a focusing cone (534) is fixedly connected to both sides of the inner cavity of the temperature monitoring box (53), a bottom bracket (535) is fixedly mounted to the bottom of the temperature monitoring box (53), and an alarm box body (536) is fixedly mounted to the top of the bottom bracket (535); A spring (5361) is fixedly mounted on the top of the alarm box body (536), a T-shaped plate (5362) is fixedly mounted on the top of the spring (5361), the bottom of the T-shaped plate (5362) extends into the inner cavity of the alarm box body (536), a battery body (5363) is fixedly mounted on the left side of the inner cavity of the alarm box body (536), a wireless signal sending device (5364) is fixedly mounted on the right side of the inner cavity of the alarm box body (536), a controller body (5366) is fixedly mounted on the bottom of the inner cavity of the alarm box body (536), a single-shot trigger switch (5365) located at the top of the controller body (5366) is fixedly mounted on the bottom of the inner cavity of the alarm box body (536), the single-shot trigger switch (5365) and the controller body (5366) are electrically connected by signals, and the controller body (5366) and the wireless signal sending device (5364) are electrically connected by signals.

2. A box-type photovoltaic inverter according to claim 1, characterized in that: The static elimination mechanism (6) comprises an insulating mounting frame (61), the insulating mounting frame (61) being detachably connected to the bottom of the protective box (1), an elastic pad (62) being fixedly mounted on the bottom of the inner cavity of the insulating mounting frame (61), a conductive patch (63) being fixedly mounted on the top of the elastic pad (62), the top of the conductive patch (63) being movably connected to the bottom of the protective box (1), and a conductive wire (64) being fixedly connected to the bottom of the conductive patch (63).

3. A box-type photovoltaic inverter according to claim 2, characterized in that: The bottom of the conductive wire (64) is fixedly connected to a ground disc (65), a main guide rod (651) is fixedly welded to the bottom of the ground disc (65), a branch guide rod (652) is fixedly welded to the outer wall of the main guide rod (651), a diffusion ring (653) is fixedly welded to the ends of the main guide rod (651) and the branch guide rod (652), and a tree-shaped rod (654) is fixedly welded to the outer wall of the diffusion ring (653).

4. A box-type photovoltaic inverter according to claim 2, characterized in that: An anti-corrosion layer 1 (641) is provided on the outer wall of the conductive wire (64), an anti-corrosion layer 2 (642) is provided on the outer wall of the anti-corrosion layer 1 (641), and an anti-weathering layer (643) is provided on the outer wall of the anti-corrosion layer 2 (642).

5. A control method for a box-type photovoltaic inverter, which is implemented based on a box-type photovoltaic inverter according to any one of claims 1 to 4, characterized in that: The control method of the box-type photovoltaic inverter comprises the following steps: S1, power conversion control: the photovoltaic inverter body (12) is pre-connected to the photovoltaic power generation system of the solar panel. When the solar panel is working, the photovoltaic effect can be used to directly convert light energy into electrical energy. Through the operation of the photovoltaic inverter body (12), the variable DC voltage generated by the solar panel is converted into AC power with a commercial frequency, and finally fed back to the commercial power transmission system, thus completing the power conversion control; S2, heat dissipation control: controlling the circulation fan (42) to drive the air in the inner cavity of the protection box (1) to circulate through the inner cavity of the cooling tube (411), and controlling the semiconductor refrigerator (413) to cool the air passing through the inner cavity of the cooling tube (411) through heat transfer through the graphite plate (412) and the temperature exchange block (414), and finally controlling the rotary motor (45) to drive the cooling arc plate (49) to rotate around the photovoltaic inverter body (12), so that the cooled gas is evenly blown toward the surface of the photovoltaic inverter body (12), thereby realizing efficient heat dissipation of the photovoltaic inverter body (12); S3. Fire self-alarm control: If the photovoltaic inverter body (12) catches fire due to a short circuit, the flame will cause the temperature of the inner cavity of the protection box (1) to rise rapidly, and the Wood alloy fuse (531) will automatically melt in the high temperature environment, thereby releasing the fixation of the movable plate (532). The movable plate (532) will then fall freely. Under the influence of the gravity of the counterweight block (533), the T-plate (5362) will be effectively pressed down, prompting the single trigger switch (5365) to receive the downward pressure information and transmit this signal to the controller body (5366). The controller body (5366) then controls the wireless signal sending device (5364) to work, and finally transmits the fire information to the staff's portable device through the wireless signal sending device (5364), thus completing the fire self-alarm control.

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