A photovoltaic inverter arc fault detection mechanism

Abstract

The present invention relates to the field of inverter detection technology, and in particular to a photovoltaic inverter arc fault detection mechanism, comprising a support frame, a fixed frame fixedly mounted on the support frame, an arc detector fixedly mounted on the side of the fixed frame, an electric control cylinder fixedly mounted in the middle position of the fixed frame, a mounting plate fixedly mounted on the lower end of the output shaft of the electric control cylinder, mounting columns symmetrically fixedly mounted on the lower surface of the mounting plate, cylindrical grooves are provided at the lower ends of the two mounting columns, conductive sheets are fixedly mounted on the tops of the two cylindrical grooves, a lifting block is vertically slidably mounted in the cylindrical groove through a sliding assembly, a telescopic spring is mounted on the lower surface of the lifting block through a mounting assembly, a moving column is mounted in the cylindrical groove, and an electrode sheet is fixedly mounted on the lower end of the moving column. The present invention sets the two electrode sheets to be movable up and down, so that the two electrode sheets can contact the electrode columns, thereby ensuring the accuracy of the photovoltaic inverter detection results.

Description

Technical Field

[0001] The present invention relates to the technical field of inverter detection, and in particular to an arc fault detection mechanism for a photovoltaic inverter. Background Art

[0002] A photovoltaic inverter is an electric power regulating device composed of semiconductor devices. It is mainly used to convert DC power into AC power. It is generally composed of a boost circuit and an inverter bridge circuit. The boost circuit boosts the DC voltage of the solar cell to the DC voltage required for the inverter output control; the inverter bridge circuit converts the boosted DC voltage into an AC voltage of a common frequency. During the production process of the photovoltaic inverter, the produced photovoltaic inverter needs to be subjected to arc fixing detection to ensure the quality of the photovoltaic inverter.

[0003] A Chinese patent with publication number CN116087725B discloses a photovoltaic inverter arc fault detection device, which belongs to the field of inverter detection technology. It automatically realizes the connection between the photovoltaic inverter and the arc detector, improves the detection efficiency, and at the same time reduces the damage caused to the staff by the arc generated during the detection process, thereby improving the safety performance.

[0004] In the above patent document, when testing the photovoltaic inverter, it is necessary to drive the two electrode sheets to move vertically downward at the same time to contact the two electrode columns of the photovoltaic inverter. The two electrode sheets are on the same horizontal plane. However, during the production process of the photovoltaic inverter, it is impossible to ensure that the heights of the two electrode columns are the same. There may be a height difference between the two electrode columns. Therefore, when the electrode sheets contact the electrode columns, one of the electrode sheets may contact the electrode column while the other electrode sheet may have poor contact with the electrode column, thereby affecting the detection results of the photovoltaic inverter. Summary of the invention

[0005] The purpose of the present invention is to solve the following shortcomings in the prior art: during the production process of the photovoltaic inverter, it is impossible to ensure that the heights of the two electrode columns are the same, and there may be a height difference between the two electrode columns. Therefore, when the electrode sheet contacts the electrode column, one of the electrode sheets may contact the electrode column, while the other electrode sheet may have poor contact with the electrode column, thereby affecting the detection result of the photovoltaic inverter, and a photovoltaic inverter arc fault detection mechanism is proposed.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A photovoltaic inverter arc fault detection mechanism, comprising a support frame, a transmission belt is installed on the support frame, a U-shaped fixing frame is fixedly installed on the support frame, an arc detector is fixedly installed on the side of the fixing frame, an electric control cylinder is fixedly installed in the middle position of the fixing frame, a mounting plate is fixedly installed at the lower end of the output shaft of the electric control cylinder, mounting columns are symmetrically fixedly installed on the lower surface of the mounting plate, cylindrical grooves are opened at the lower ends of two mounting columns, conductive sheets are fixedly installed on the tops of the two cylindrical grooves, and the two conductive sheets are respectively connected to the positive and negative electrodes of the arc detector through connecting wires;

[0008] A lifting block is installed in the cylindrical groove through a sliding assembly for vertical sliding, a telescopic spring is installed on the lower surface of the lifting block through a mounting assembly, a moving column is installed in the cylindrical groove through a mounting frame for vertical sliding, one end of the telescopic spring is fixedly connected to one end of the moving column, and an electrode sheet is fixedly installed at the lower end of the moving column;

[0009] A metal rod is vertically installed through the middle part of the lifting block, and the upper and lower ends of the metal rod are respectively fixedly connected to the conductive sheet and the moving column through wires, and the moving column, the metal rod and the electrode sheet are all made of conductive materials;

[0010] The lifting block is symmetrically provided with slide grooves on its side, the sliding assembly comprises two slide rails symmetrically and vertically fixedly installed on the inner wall of the cylindrical groove, the two slide rails are respectively slidably arranged in the two slide grooves, and the lifting block is vertically slidably arranged on the two slide rails;

[0011] The mounting assembly comprises two telescopic rods vertically fixedly mounted on the lower surface of the lifting block and a connecting plate fixedly mounted at the lower ends of the two telescopic rods, one end of the telescopic spring away from the moving column is fixedly connected to the connecting plate, a through hole is provided at the center of the connecting plate, and the wire between the metal rod and the moving column passes through the through hole;

[0012] A rectangular groove is provided on the lower surface of the lifting block, a power-on spring is fixedly installed horizontally in the middle of the rectangular groove, the middle part of the power-on spring is fixedly connected to the metal rod, resistance blocks are fixedly installed at both ends of the power-on spring, and two resistance blocks are horizontally slidably installed in the rectangular groove and are located between two slide rails;

[0013] A rubber pad is fixedly mounted on one side of the resistance block away from the energized spring, and the rubber pad is located between the resistance block and the slide rail.

[0014] As a preferred solution, stoppers are fixedly mounted on both upper and lower ends of the slide rail, and the lifting block slides between the two stoppers.

[0015] As a preferred solution, the elastic coefficient of the energized spring is greater than the elastic coefficient of the telescopic spring, and a transmission component for driving the two resistance blocks to approach each other is provided on the connecting plate.

[0016] As a preferred solution, the transmission assembly includes two L-shaped top rods symmetrically fixedly installed on the side of the connecting plate and two inclined plates obliquely installed on the two resistance blocks respectively, and the upper ends of the L-shaped top rods are in sliding contact with the surfaces of the inclined plates.

[0017] As a preferred solution, an air port penetrating into the interior of the moving column is opened in the middle of the lower surface of the electrode sheet, an air pipe connected to the air port is installed on the side of the moving column, and an inflation component for introducing gas into the air pipe is installed on the side of the mounting column.

[0018] As a preferred embodiment, the inflation assembly includes a gas collecting cylinder fixedly mounted on the side of the mounting column, a sealing plate vertically and sealingly slidably mounted in the gas collecting cylinder, a return spring fixedly mounted on the upper surface of the sealing plate, and a push rod fixedly mounted on the lower surface of the sealing plate, one end of the return spring is fixedly connected to the inner wall of the gas collecting cylinder, one end of the push rod is fixedly connected to the movable column, one end of the air pipe is connected to the interior of the gas collecting cylinder, a through pipe is mounted on the upper end of the gas collecting cylinder, and a one-way valve is mounted in the through pipe, which only allows gas to enter the gas collecting cylinder from the outside.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. When the photovoltaic inverter moves to the bottom of the fixed frame through the transmission belt, the electric control cylinder drives the two mounting columns to move vertically downward. When the electrode sheet contacts the electrode column, the mounting column continues to press down. Through the cooperation of the sliding assembly, the lifting block, the telescopic spring and the moving column, the electrode sheet can move toward the mounting column until the two electrode sheets on the two mounting columns contact the two electrode columns on the photovoltaic inverter respectively. The two electrode sheets are set to be movable up and down so that both electrode sheets can contact the electrode columns to ensure the accuracy of the photovoltaic inverter detection results.

[0021] 2. When the two electrode sheets are in contact with the two electrode columns of the photovoltaic inverter respectively, a closed loop will be formed between the photovoltaic inverter and the arc detector through the cooperation of the electrode sheets, wires, metal rods, conductive sheets and connecting wires. At this time, the energized spring will be stretched and deformed, driving the rubber pad on the resistance block to contact the slide rail, generating a large friction force. Under the action of friction, the movement of the lifting block is restricted, thereby compressing the telescopic spring. When the electrode sheet is in contact with the electrode column, under the action of the elastic force of the telescopic spring, the electrode sheet is ensured to have downward pressure, so that the electrode sheet can stably contact with the electrode column.

[0022] 3. When the telescopic spring is compressed to a large extent, the two resistance blocks will be driven closer to each other through the transmission assembly. At this time, the friction between the rubber pad and the slide rail will decrease until the lifting block can move upward in the cylindrical groove, reducing the elastic force of the telescopic spring. Then, the rubber pad will contact the slide rail through the energized spring to lock the lifting block, thereby controlling the compression degree of the telescopic spring to avoid excessive compression of the telescopic spring, which will cause excessive pressure of the electrode sheet on the electrode column, and can effectively prevent the electrode column of the photovoltaic inverter from being deformed during detection.

[0023] 4. When there are dust and impurities between the electrode sheet and the electrode column, the circuit between the arc detector and the photovoltaic inverter may be broken. At this time, the energized spring cannot be stretched, and the lifting block cannot be locked. The moving column will move into the cylindrical groove. At this time, through the cooperation of the inflation assembly and the air pipe, the air port will spray gas between the electrode sheet and the electrode column, thereby blowing away the dust between the electrode sheet and the electrode column, ensuring that the electrode sheet can be electrically connected to the electrode column. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a left-view stereoscopic structural schematic diagram of a photovoltaic inverter arc fault detection mechanism proposed by the present invention;

[0025] Figure 2 A schematic diagram of a right-side stereoscopic structure of an arc fault detection mechanism for a photovoltaic inverter proposed by the present invention;

[0026] Figure 3 It is a three-dimensional structural diagram of the fixing frame, electric control cylinder, mounting column, arc detector and photovoltaic inverter;

[0027] Figure 4 It is a schematic diagram of the partial three-dimensional structure of the installation column, electrode sheet, inflation component and photovoltaic inverter;

[0028] Figure 5 It is a three-dimensional structural schematic diagram of an arc detector, a mounting plate, a mounting column, a movable column and an electrode sheet;

[0029] Figure 6 It is a schematic diagram of the three-dimensional cross-sectional structure of the installation column, lifting block, moving column and electrode sheet;

[0030] Figure 7 for Figure 6 The enlarged structural diagram at A in the middle;

[0031] Figure 8 It is a schematic diagram of the front view of the three-dimensional structure of the lifting block and the metal rod;

[0032] Fig. 9 It is a schematic diagram of the three-dimensional structure of the lifting block and the metal rod when viewed from above;

[0033] Fig.10It is a schematic diagram of the three-dimensional cross-sectional structure of the moving column, electrode sheet and inflation component.

[0034] In the figure: 1 support frame, 2 transmission belt, 3 fixing frame, 4 electric control cylinder, 5 mounting plate, 6 mounting column, 7 cylindrical groove, 8 conductive sheet, 9 connecting wire, 10 lifting block, 11 telescopic spring, 12 moving column, 13 electrode sheet, 14 metal rod, 15 wire, 16 slide rail, 17 telescopic rod, 18 connecting plate, 19 power spring, 20 resistance block, 21 rubber pad, 22 stopper, 23 L-shaped push rod, 24 inclined plate, 25 air port, 26 air pipe, 27 air collecting cylinder, 28 sealing plate, 29 reset spring, 30 push rod, 31 through pipe, 32 arc detector. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0036] Reference Figure 1-Figure 10 A photovoltaic inverter arc fault detection mechanism includes a support frame 1, a transmission belt 2 is installed on the support frame 1, a U-shaped fixing frame 3 is fixedly installed on the support frame 1, an arc detector 32 is fixedly installed on the side of the fixing frame 3, an electric control cylinder 4 is fixedly installed in the middle position of the fixing frame 3, a mounting plate 5 is fixedly installed at the lower end of the output shaft of the electric control cylinder 4, mounting columns 6 are symmetrically fixedly installed on the lower surface of the mounting plate 5, cylindrical grooves 7 are opened at the lower ends of the two mounting columns 6, and conductive sheets 8 are fixedly installed on the tops of the two cylindrical grooves 7. The two conductive sheets 8 are respectively connected to the positive and negative electrodes of the arc detector 32 through connecting wires 9.

[0037] A lifting block 10 is vertically slidably installed in the cylindrical groove 7 through a sliding assembly, and a telescopic spring 11 is installed on the lower surface of the lifting block 10 through an installation assembly. A moving column 12 is vertically slidably installed in the cylindrical groove 7 through a mounting frame, one end of the telescopic spring 11 is fixedly connected to one end of the moving column 12, and an electrode sheet 13 is fixedly installed on the lower end of the moving column 12. The lifting block 10 can be vertically moved in the cylindrical groove 7 through the sliding assembly, and the moving column 12 is vertically slidably installed under the lifting block 10, and is connected to the lifting block 10 through the telescopic spring 11 and the installation assembly. In the initial state, the lifting block 10 is located at the bottom of the cylindrical groove 7 under its own gravity, and the initial heights of the two electrode sheets 13 are on the same horizontal plane. When the electrode sheet 13 contacts the electrode column, the moving column 12 will move into the cylindrical groove 7, and at the same time, the lifting block 10 is driven to move vertically upward in the cylindrical groove 7 through the telescopic spring 11.

[0038] A metal rod 14 is vertically installed through the middle part of the lifting block 10. The upper and lower ends of the metal rod 14 are fixedly connected to the conductive sheet 8 and the moving column 12 respectively through wires 15. The moving column 12, the metal rod 14 and the electrode sheet 13 are all made of conductive materials.

[0039] The arc detector 32 is a detection instrument that can be used to detect whether an arc fault occurs in a photovoltaic inverter. Figure 1 , 3 , 4 are marked as a. During the test, the transmission belt 2 transports the produced photovoltaic inverter to the bottom of the fixing frame 3, and then the electric cylinder 4 drives the mounting plate 5 to move vertically downward, so that the two electrode sheets 13 are respectively in contact with the two electrode columns of the photovoltaic inverter. Figure 4 The mark in the middle is marked as b, and the electrode sheet 13 is connected to the arc detector 32 through the movable column 12, the metal rod 14, the wire 15, the conductive sheet 8 and the connecting wire 9. When the two electrode sheets 13 are connected to the two electrode columns of the photovoltaic inverter, the photovoltaic inverter and the arc detector 32 form a closed loop, which can perform arc fault detection on the photovoltaic inverter.

[0040] When testing the photovoltaic inverter, the electric control cylinder 4 drives the two mounting columns 6 to move vertically downward through the mounting plate 5. When there is a height difference between the two electrode columns of the photovoltaic inverter, one of the electrode sheets 13 will contact the electrode column first. At this time, the electrode column will restrict the electrode sheet 13 in contact from continuing to move vertically downward. As the mounting column 6 continues to move downward, the electrode sheet 13 in contact with the electrode column will drive the lifting block 10 to move vertically upward in the cylindrical groove 7 through the moving column 12 and the telescopic spring 11 until the other electrode sheet 13 contacts the electrode column of the photovoltaic inverter, so that both electrode sheets 13 can contact the electrode column to avoid poor contact.

[0041] The lifting block 10 is symmetrically provided with sliding grooves on the side, and the sliding assembly includes two sliding rails 16 symmetrically and vertically fixedly installed on the inner wall of the cylindrical groove 7. The two sliding rails 16 are respectively slidably set in the two sliding grooves. The lifting block 10 is vertically slidably set on the two sliding rails 16. Blocks 22 are fixedly installed at the upper and lower ends of the sliding rails 16. The lifting block 10 slides between the two block blocks 22. The lifting block 10 is vertically slidably installed in the cylindrical groove 7 through the sliding rails 16. The sliding rails 16 can ensure the stability of the movement of the lifting block 10 and avoid shaking during the movement. At the same time, the setting of the two block blocks 22 on the sliding rails 16 can prevent the lifting block 10 from falling off the sliding rails 16.

[0042] The mounting assembly includes two telescopic rods 17 vertically fixedly mounted on the lower surface of the lifting block 10 and a connecting plate 18 fixedly mounted at the lower ends of the two telescopic rods 17. One end of the telescopic spring 11 away from the moving column 12 is fixedly connected to the connecting plate 18. A through hole is provided at the center of the connecting plate 18. The wire 15 between the metal rod 14 and the moving column 12 passes through the through hole. One end of the telescopic spring 11 is connected to the lifting block 10 through the connecting plate 18 and the telescopic rod 17, so that it is installed directly below the lifting block 10. When the connecting plate 18 moves, it can move relative to the wire 15.

[0043] A rectangular groove is provided on the lower surface of the lifting block 10, and a power-carrying spring 19 is horizontally fixedly installed in the middle position of the rectangular groove. The middle position of the power-carrying spring 19 is fixedly connected to the metal rod 14, and resistance blocks 20 are fixedly installed at both ends of the power-carrying spring 19. The two resistance blocks 20 are horizontally slidably installed in the rectangular groove and are located between the two slide rails 16. A rubber pad 21 is fixedly installed on the side of the resistance block 20 away from the power-carrying spring 19, and the rubber pad 21 is located between the resistance block 20 and the slide rail 16.

[0044] The rubber pad 21 is installed on the side of the resistance block 20 close to the slide rail 16. The two resistance blocks 20 are symmetrically slidably installed in the rectangular groove. The power-on spring 19 is a prior art. When current is passed through, the power-on spring 19 will undergo tensile deformation. Since the middle part of the power-on spring 19 is fixedly connected to the metal rod 14, when the power-on spring 19 is energized, the two ends will drive the two resistance blocks 20 away from each other until the rubber pad 21 contacts the slide rail 16. The rubber pad 21 undergoes compression deformation, and a large friction force is generated between the rubber pad 21 and the slide rail 16. Under the friction force, the lifting block 10 can be limited from sliding on the slide rail 16.

[0045] When the lifting block 10 is locked and the mounting column 6 continues to move vertically downward, the distance between the electrode sheet 13 and the lifting block 10 gradually decreases. At this time, the telescopic spring 11 is compressed to generate a certain elastic force. Under the action of the elastic force of the telescopic spring 11, it can be ensured that the electrode sheet 13 always exerts pressure on the electrode column, thereby improving the stability of the electrode sheet 13 when in contact with the electrode column.

[0046] The elastic coefficient of the energized spring 19 is greater than the elastic coefficient of the telescopic spring 11. A transmission assembly is provided on the connecting plate 18 for driving the two resistance blocks 20 to approach each other. The transmission assembly includes two L-shaped top rods 23 symmetrically fixedly mounted on the sides of the connecting plate 18 and two inclined plates 24 respectively obliquely mounted on the two resistance blocks 20. The upper end of the L-shaped top rod 23 is in sliding contact with the surface of the inclined plate 24.

[0047] Since the elastic coefficient of the energized spring 19 is greater than the elastic coefficient of the telescopic spring 11, when the lifting block 10 is locked, the telescopic spring 11 will begin to compress first. When the elastic force of the telescopic spring 11 is too large, the connecting plate 18 will move upward. At this time, the two resistance blocks 20 are driven closer to each other through the L-shaped top rod 23 and the inclined plate 24, and then the rubber pad 21 is driven gradually away from the slide rail 16. At this time, the friction between the rubber pad 21 and the slide rail 16 will gradually decrease until the friction is too small to lock the lifting block 10, so that the lifting block 10 moves upward again in the cylindrical groove 7.

[0048] An air port 25 is provided in the middle position of the lower surface of the electrode sheet 13 and penetrates into the interior of the moving column 12. An air pipe 26 connected to the air port 25 is installed on the side of the moving column 12. An inflation assembly for introducing gas into the air pipe 26 is installed on the side of the mounting column 6. The inflation assembly includes a gas collecting cylinder 27 fixedly installed on the side of the mounting column 6, a sealing plate 28 vertically sealingly and slidingly installed in the gas collecting cylinder 27, a reset spring 29 fixedly installed on the upper surface of the sealing plate 28, and a push rod 30 fixedly installed on the lower surface of the sealing plate 28. One end of the reset spring 29 is fixedly connected to the inner wall of the gas collecting cylinder 27, one end of the push rod 30 is fixedly connected to the moving column 12, one end of the air pipe 26 is connected to the interior of the gas collecting cylinder 27, a through pipe 31 is installed on the upper end of the gas collecting cylinder 27, and a one-way valve that only allows gas to enter the gas collecting cylinder 27 from the outside is installed in the through pipe 31.

[0049] The air port 25 is opened in the middle position of the electrode sheet 13. When the inflation assembly sprays gas to the air port 25 through the air pipe 26, the gas will diffuse from the middle position of the electrode sheet 13 to the surroundings, so as to blow away the dust on the electrode column. When the electrode sheet 13 contacts the electrode column, the movable column 12 will move into the cylindrical groove 7. At this time, the movable column 12 will drive the push rod 30 to move upward, and then drive the sealing plate 28 to move upward. In the process of moving upward, the sealing plate 28 will squeeze the air in the gas collecting cylinder 27 into the air pipe 26 and spray it out through the air port 25. When the electrode sheet 13 is separated from the electrode column, under the action of the elastic force of the reset spring 29, the sealing plate 28 will move vertically downward. At this time, the outside air will enter the gas collecting cylinder 27 through the through pipe 31.

[0050] In the present invention, when the detection mechanism is in use, the transmission belt 2 conveys the photovoltaic inverter to be detected to the bottom of the fixing frame 3, and at the same time starts the electric control cylinder 4, drives the two mounting columns 6 to move vertically downward through the mounting plate 5, and then drives the two electrode sheets 13 to approach the two electrode columns on the photovoltaic inverter. When there is a height difference between the two electrode columns, when the electrode sheets 13 move downward, one of the electrode sheets 13 will contact the electrode column first. At this time, the electrode column will limit the contacting electrode sheet 13 from continuing to move vertically downward. As the mounting column 6 continues to move downward, the distance between the electrode sheet 13 and the mounting column 6 gradually decreases. The electrode sheet 13 will drive the lifting block 10 to move vertically upward in the cylindrical groove 7 through the moving column 12 and the telescopic spring 11 until the other electrode sheet 13 contacts the other electrode column. The two electrode sheets 13 are arranged to be movable up and down so that both electrode sheets 13 can contact the electrode column, thereby ensuring the accuracy of the photovoltaic inverter detection results.

[0051] When both electrode sheets 13 are in contact with the electrode column, a closed loop is formed between the photovoltaic inverter and the arc detector 32 through the electrode sheet 13, the movable column 12, the metal rod 14, the wire 15, the conductive sheet 8 and the connecting wire 9. At this time, current is passed through the energized spring 19, which is stretched and deformed, thereby driving the two resistance blocks 20 to move away from each other, so that the rubber pad 21 is in contact with the slide rail 16. The rubber pad 21 is compressed and deformed, and a large friction force is generated between the rubber pad 21 and the slide rail 16. Under the friction force, the lifting block 10 is locked in the cylindrical groove 7. When the mounting column 6 continues to move vertically downward, the distance between the electrode sheet 13 and the lifting block 10 gradually decreases. At this time, the telescopic spring 11 is compressed to generate a certain elastic force. Under the action of the elastic force of the telescopic spring 11, it can be ensured that the electrode sheet 13 always has pressure on the electrode column, thereby improving the stability of the electrode sheet 13 when in contact with the electrode column.

[0052] When the compression degree of the telescopic spring 11 is too large, the pressure exerted by the electrode sheet 13 on the electrode column may cause the electrode column to deform. When the elastic force of the telescopic spring 11 gradually exceeds the elastic force of the energized spring 19, the connecting plate 18 will approach the lifting block 10, and the connecting plate 18 will drive the two resistance blocks 20 to approach each other through the L-shaped top rod 23 and the inclined plate 24, thereby driving the rubber pad 21 to gradually move away from the slide rail 16. At this time, the friction between the rubber pad 21 and the slide rail 16 will gradually decrease until the friction is too small to lock the lifting block 10, so that the lifting block 10 moves upward again in the cylindrical groove 7. The elastic force of the telescopic spring 11 is reduced, thereby reducing the compression degree of the telescopic spring 11 and reducing the elastic force of the telescopic spring 11. When the elastic force of the telescopic spring 11 is less than the energized spring 19, the friction between the rubber pad 21 and the slide rail 16 will increase again until the lifting block 10 is locked in the cylindrical groove 7 again. When the compression degree of the telescopic spring 11 is too large, the lifting block 10 can be automatically contacted and locked, thereby controlling the compression degree of the telescopic spring 11 and avoiding excessive compression of the telescopic spring 11, which causes excessive pressure of the electrode sheet 13 on the electrode column, and effectively avoiding deformation of the electrode column of the photovoltaic inverter during detection.

[0053] When the electrode sheet 13 is in contact with the electrode column, if there are more dust and impurities on the surface of the electrode column, it may affect the contact between the electrode sheet 13 and the electrode column, resulting in poor contact. When poor contact occurs, no current will be passed into the power spring 19, and the lifting block 10 cannot be locked at this time. The moving column 12 will continue to move into the cylindrical groove 7. At the same time, the moving column 12 will drive the sealing plate 28 to move vertically upward through the push rod 30, squeeze the air in the gas collecting cylinder 27 into the air pipe 26, and then spray it out through the air port 25. The gas after spraying will diffuse outward from the middle of the electrode column, which can clean the dust on the electrode column, ensure that the electrode sheet 13 can be electrically connected to the electrode column, and avoid poor contact.

[0054] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A photovoltaic inverter arc fault detection mechanism, comprising a support frame (1), characterized in that: A transmission belt (2) is installed on the support frame (1), a U-shaped fixing frame (3) is fixedly installed on the support frame (1), an arc detector (32) is fixedly installed on the side of the fixing frame (3), an electric control cylinder (4) is fixedly installed in the middle position of the fixing frame (3), a mounting plate (5) is fixedly installed at the lower end of the output shaft of the electric control cylinder (4), and mounting columns (6) are symmetrically fixedly installed on the lower surface of the mounting plate (5), two mounting columns (6) are respectively provided with cylindrical grooves (7) at the lower ends, and conductive sheets (8) are fixedly installed on the tops of the two cylindrical grooves (7), and the two conductive sheets (8) are respectively connected to the positive and negative electrodes of the arc detector (32) through connecting wires (9); A lifting block (10) is installed in the cylindrical groove (7) in a vertical sliding manner via a sliding assembly, a telescopic spring (11) is installed on the lower surface of the lifting block (10) via a mounting assembly, a moving column (12) is installed in the cylindrical groove (7) in a vertical sliding manner via a mounting frame, one end of the telescopic spring (11) is fixedly connected to one end of the moving column (12), and an electrode sheet (13) is fixedly installed at the lower end of the moving column (12); A metal rod (14) is installed vertically through the middle of the lifting block (10); the upper and lower ends of the metal rod (14) are respectively fixedly connected to the conductive sheet (8) and the movable column (12) through wires (15); the movable column (12), the metal rod (14) and the electrode sheet (13) are all made of conductive materials; The lifting block (10) has symmetrically provided sliding grooves on its side, and the sliding assembly comprises two sliding rails (16) symmetrically and vertically fixedly mounted on the inner wall of the cylindrical groove (7), the two sliding rails (16) being slidably mounted in the two sliding grooves respectively, and the lifting block (10) being vertically slidably mounted on the two sliding rails (16); The mounting assembly comprises two telescopic rods (17) vertically fixedly mounted on the lower surface of the lifting block (10) and a connecting plate (18) fixedly mounted at the lower ends of the two telescopic rods (17); one end of the telescopic spring (11) away from the moving column (12) is fixedly connected to the connecting plate (18); a through hole is provided at the center of the connecting plate (18), and a wire (15) between the metal rod (14) and the moving column (12) passes through the through hole; A rectangular groove is formed on the lower surface of the lifting block (10), a power-carrying spring (19) is horizontally fixedly installed in the middle of the rectangular groove, the middle part of the power-carrying spring (19) is fixedly connected to the metal rod (14), and resistance blocks (20) are fixedly installed at both ends of the power-carrying spring (19), and the two resistance blocks (20) are horizontally slidably installed in the rectangular groove and are located between the two slide rails (16); A rubber pad (21) is fixedly mounted on a side of the resistance block (20) away from the energized spring (19), and the rubber pad (21) is located between the resistance block (20) and the slide rail (16).

2. A photovoltaic inverter arc fault detection mechanism according to claim 1, characterized in that: Stop blocks (22) are fixedly mounted at both upper and lower ends of the slide rail (16), and the lifting block (10) slides between the two stop blocks (22).

3. A photovoltaic inverter arc fault detection mechanism according to claim 1, characterized in that: The elastic coefficient of the energizing spring (19) is greater than the elastic coefficient of the telescopic spring (11), and a transmission component for driving the two resistance blocks (20) to move closer to each other is provided on the connecting plate (18).

4. A photovoltaic inverter arc fault detection mechanism according to claim 3, characterized in that: The transmission assembly comprises two L-shaped push rods (23) symmetrically fixedly mounted on the side of the connecting plate (18) and two inclined plates (24) respectively obliquely mounted on the two resistance blocks (20), wherein the upper ends of the L-shaped push rods (23) are in sliding contact with the surfaces of the inclined plates (24).

5. A photovoltaic inverter arc fault detection mechanism according to claim 1, characterized in that: An air port (25) penetrating into the interior of the moving column (12) is provided in the middle of the lower surface of the electrode sheet (13); an air pipe (26) connected to the air port (25) is installed on the side of the moving column (12); and an air charging component for introducing gas into the air pipe (26) is installed on the side of the mounting column (6).

6. A photovoltaic inverter arc fault detection mechanism according to claim 5, characterized in that: The inflation assembly comprises a gas collecting cylinder (27) fixedly mounted on the side of the mounting column (6), a sealing plate (28) vertically sealingly slidably mounted in the gas collecting cylinder (27), a return spring (29) fixedly mounted on the upper surface of the sealing plate (28), and a push rod (30) fixedly mounted on the lower surface of the sealing plate (28), one end of the return spring (29) is fixedly connected to the inner wall of the gas collecting cylinder (27), one end of the push rod (30) is fixedly connected to the movable column (12), one end of the air pipe (26) is connected to the inside of the gas collecting cylinder (27), a through pipe (31) is mounted on the upper end of the gas collecting cylinder (27), and a one-way valve is mounted in the through pipe (31) for only allowing gas to enter the gas collecting cylinder (27) from the outside.

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