Photovoltaic power generation combiner box with high temperature protection structure

Abstract

The present invention discloses a photovoltaic power generation combiner box with a high temperature protection structure, which relates to the technical field of photovoltaic power generation combiner boxes. It includes a shell, the shell is hinged with an outer cover, a mounting plate is detachably installed in the shell, the shell is provided with equidistant and symmetrically distributed heat dissipation holes, the outer side of the shell is fixedly connected with guide plates near the equidistant and symmetrically distributed heat dissipation holes, the shell is sealed and slidably connected with a shielding plate near the equidistant and symmetrically distributed guide plates, a detection part is fixedly connected in the shell, gas is stored in the detection part, and a push rod is sealed and slidably connected in the detection part. The present invention uses the principle of thermal expansion and contraction to detect the temperature in the shell, controls the opening and closing of the heat dissipation holes according to the temperature change in the shell, and uses the principle of isolating air to suppress the increase of fire in the shell, so as to protect other electrical components in the shell.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic power generation combiner boxes, and in particular to a photovoltaic power generation combiner box with a high temperature protection structure. Background Art

[0002] Photovoltaic power generation technology is based on the photovoltaic effect of semiconductor interfaces, which converts sunlight directly into electrical energy. This system is mainly composed of three key parts: solar panels, controllers and inverters. After being connected in series and packaged for protection, solar cells can be formed into large-area photovoltaic modules. Combined with other components such as power controllers, they constitute a complete photovoltaic power generation system.

[0003] The controller of photovoltaic power generation includes a photovoltaic power generation junction box, whose main function is to conduct primary junction of the input of the solar cell array, so as to reduce the connection between the solar cell array and the inverter. Since the cables of the solar cell array are connected to the corresponding terminals in the junction box, if the cables are frequently shaken by external factors (such as wind or waves in offshore photovoltaic systems), relative displacement occurs between the cables and the terminals, resulting in a reduction in the contact area between the two, and an increase in the resistance at the contact position between the two. When the current passes through this position, additional heat is generated, resulting in an increase in temperature in the junction box and even a fire. It is currently difficult to know the fire in the junction box in the first time, and it is impossible to control the fire in the junction box in time, causing the fire to spread in the junction box, causing damage to other electrical components in the junction box, resulting in huge property losses. Summary of the invention

[0004] The present invention provides a photovoltaic power generation combiner box with a high temperature protection structure to overcome the disadvantage that the existing combiner box cannot protect other electrical components therein when a fire occurs.

[0005] The technical implementation scheme of the present invention is: a photovoltaic power generation junction box with a high-temperature protection structure, comprising a shell, the shell is hinged with an outer cover, the shell is detachably provided with a mounting plate, the shell is provided with equidistant and symmetrically distributed heat dissipation holes, the outer side of the shell is fixedly connected with guide plates near the equidistant and symmetrically distributed heat dissipation holes, the shell is sealed and slidably connected with a baffle plate near the equidistant and symmetrically distributed guide plates, a detection component is fixedly connected to the shell, gas is stored in the detection component, a push rod is sealed and slidably connected to the detection component, the push rod is fixed to the baffle plate, a limiting ball is slidably connected to the position near the push rod in the shell, a spring is fixedly connected between the limiting ball and the shell, and the limiting ball and the push rod are limitedly matched.

[0006] Furthermore, it also includes a fixing seat that is equidistant and symmetrically distributed, the fixing seat is slidably connected to the shell, a fixing piece is fixedly connected to the fixing seat, the fixing seat passes through the shell and is threadedly connected to a fastener, an end cover is slidably matched with a position on the fixing seat away from the adjacent fastener, an L-shaped groove that is annularly distributed and used for the sliding of adjacent end covers is provided on the fixing seat, a sliding ring is connected to the fixed seat for limited sliding, a spring is fixedly connected between the side of the sliding ring away from the shell and the adjacent fixing seat, an extrusion piece that is annularly distributed is fixedly connected to the side of the sliding ring away from the adjacent fixing piece, limiting holes that are annularly distributed and respectively limitedly matched with adjacent extrusion pieces are provided on the fixing seat, the limiting holes are communicated with the adjacent L-shaped grooves, the end covers are extruded and matched with the adjacent L-shaped grooves, and the extrusion piece is extruded and matched with the adjacent end covers.

[0007] Furthermore, a pull rope is fixedly connected to the side of the annularly distributed extrusion parts away from the adjacent sliding ring, a transposition ring is connected to the fixed seat in a limited sliding manner, the pull rope is fixed to the adjacent transposition ring, a tension spring is fixedly connected between the side of the transposition ring away from the adjacent sliding ring and the adjacent fixed seat, a symmetrical and annularly distributed connecting plate is fixedly connected to the transposition ring, the connecting plates symmetrically distributed on the same transposition ring are commonly fixed with a clamping part, the fixed seat is provided with annularly distributed upper reset grooves that are respectively limited and matched with the adjacent clamping parts, and the fixed seat is provided with annularly distributed lower reset grooves that are respectively limited and matched with the adjacent extrusion parts.

[0008] Furthermore, the height of the connecting plate is lower than the height of the adjacent clamping member, and the width of the clamping member in the horizontal direction is greater than its thickness in the vertical direction, so that the clamping member can release the clamping of the cable.

[0009] Furthermore, on the same fixing seat, the annularly distributed clamping members and the annularly distributed extruding members are alternately distributed to improve the clamping effect of the cable.

[0010] Furthermore, the elastic coefficient of the tension spring between the transposition ring and the adjacent fixing seat is greater than the elastic coefficient of the spring between the sliding ring and the adjacent fixing seat, and the elastic coefficient of the spring between the sliding ring and the adjacent fixing seat is greater than the elastic coefficient of the deformation of the extrusion member.

[0011] Furthermore, an annularly distributed elastic sheet is fixed inside the fastener, an annularly distributed limiting groove is provided on the fixing seat near the position of the adjacent fastener, the elastic sheet is limitedly matched with the adjacent limiting groove, an upper sealing ring is fixed to one side of the fixing member near the adjacent fastener, and the upper sealing ring is extruded and matched with the shell.

[0012] Furthermore, the height of the limiting groove is greater than the sum of the thickness of the shell and the height of the elastic sheet.

[0013] Furthermore, a lower sealing ring is fixedly connected in the end cover, and an annular inclined surface is provided on the fixing seat at a position away from the adjacent fastener, and the annular inclined surface is squeezed and matched with the adjacent lower sealing ring to make the lower sealing ring close to the cable.

[0014] Furthermore, a blocking piece is pasted on the end cover, arc-shaped grooves are provided on the end cover, the blocking piece contacts the adjacent grooves, and the blocking piece is in blocking cooperation with the adjacent fixing seat.

[0015] The present invention discloses the following technical effects: the present invention utilizes the principle of thermal expansion and contraction to detect the temperature inside the shell, controls the opening and closing of the heat dissipation holes according to the temperature changes inside the shell, utilizes the principle of isolating air to suppress the increase of the fire inside the shell, and achieves the purpose of protecting other electrical components in the shell.

[0016] The cable is fixed by an extrusion piece, and the pulling force on the cable is buffered by a spring to prevent damage to the connection between the cable and the terminal due to hard pulling.

[0017] The cable is clamped alternately by the clamping member and the extruding member, so that the position of the extruding member clamping the cable is changed, thereby preventing the cable insulation from being deformed due to long-term extrusion, thereby maintaining the insulation capacity of the cable.

[0018] The unused fixing seat is blocked by the blocking piece to ensure that the shell is not connected to the outside through the fixing seat to which the cable is not connected, thereby reducing the impact of the external environment on the environment inside the shell through the fixing seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the three-dimensional structure of the guide plate and the shielding plate of the present invention;

[0021] Figure 3 It is a three-dimensional structural cross-sectional view of the housing, the guide plate and the shielding plate of the present invention;

[0022] Figure 4 It is a three-dimensional structural schematic diagram of the fixing seat, fixing member and fastener of the present invention;

[0023] Figure 5 It is a three-dimensional structural cross-sectional view of the fixing member, the fastener and the end cover of the present invention;

[0024] Figure 6It is a schematic diagram of the three-dimensional structure of the sliding ring, the extrusion part and the transposition ring of the present invention;

[0025] Figure 7 It is a three-dimensional structural schematic diagram of the connecting plate and the clamping member of the present invention;

[0026] Figure 8 An exploded view of the fixing seat, the end cover and the clamping member of the present invention;

[0027] Fig. 9 It is a schematic diagram of the three-dimensional structure of the fixing seat and the elastic sheet of the present invention;

[0028] Fig.10 It is a three-dimensional structural schematic diagram of the fixing seat, the end cover and the blocking piece of the present invention.

[0029] The names and serial numbers of the parts in the figure are: 1-shell, 2-outer cover, 3-mounting plate, 4-guide plate, 401-heat dissipation hole, 5-shielding plate, 6-detection part, 7-push rod, 8-limiting ball, 9-fixing seat, 10-fixing part, 11-fastener, 12-end cover, 121-L-shaped groove, 13-sliding ring, 14-extrusion part, 141-limiting hole, 15-pull rope, 16-transposition ring, 17-connecting plate, 18-clamping part, 181-upper reset groove, 182-lower reset groove, 19-elastic sheet, 191-limiting groove, 20-upper sealing ring, 21-lower sealing ring, 211-annular inclined surface, 22-blocking sheet, 221-groove. DETAILED DESCRIPTION

[0030] 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.

[0031] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0032] During the use of the combiner box, if the cables are frequently shaken by external factors (such as wind or waves in an offshore photovoltaic system), the cables and the terminal blocks will be relatively displaced, resulting in a reduction in the contact area between the two, and an increase in the resistance at the contact position between the two, which will cause additional heat to be generated when the current passes through this position, leading to an increase in temperature in the combiner box and even a fire. Currently, it is difficult to know immediately after a fire in the combiner box, and it is impossible to control the fire in the combiner box in time, resulting in all electrical components in the combiner box being burned.

[0033] Example 1: A photovoltaic power generation combiner box with high temperature protection structure, please refer to Figure 1-Figure 3 , including a shell 1, an outer cover 2 is hinged on the left part of the front side of the shell 1, a mounting plate 3 is detachably mounted on the rear part of the shell 1, and the rear side of the mounting plate 3 is not fitted with the shell 1, a plurality of heat dissipation holes 401 which are equidistant and symmetrically distributed are opened on the rear side of the shell 1, a guide plate 4 is fixedly connected to the positions of the plurality of heat dissipation holes 401 on the rear side of the shell 1, and the guide plate 4 is used to prevent external rainwater from entering adjacent heat dissipation holes 401, a shielding plate 5 is sealed and slidably connected to the rear side of the shell 1, and a limited position is set on the rear side of the shell 1 Block, and initially, the distance between the lower side of the limit block and the baffle plate 5 is equal to the height of the heat dissipation hole 401, a detection part 6 is fixedly connected to the rear side of the shell 1, and a gas with a large thermal expansion coefficient (here is helium) is stored in the detection part 6, and a push rod 7 is sealed and slidably connected to the upper and lower parts of the detection part 6, and the push rod 7 is fixed to the baffle plate 5. A limit ball 8 is slidably connected to the left and right sides of the rear side of the shell 1, and a spring is fixed between the limit ball 8 and the shell 1, and the limit ball 8 cooperates with the push rod 7 to accumulate pressure in the gas in the detection part 6.

[0034] During the photovoltaic power generation process, if the cables of the solar cell array have poor contact with the wiring terminals in the shell 1, resulting in a fire inside the shell 1, the temperature inside the shell 1 is far higher than the normal temperature, and the helium in the detection part 6 expands, causing the pressure inside the detection part 6 to increase until the gas pressure in the detection part 6 exceeds the elastic force of the spring adjacent to the limit ball 8. The gas in the detection part 6 squeezes the push rod 7 and moves it upward. The push rod 7 squeezes the limit ball 8 to the right and compresses the spring adjacent to the limit ball 8, so that the limit ball 8 releases the limit on the push rod 7. At this time, the push rod 7 drives the baffle plate 5 to move upward and makes the baffle plate 5 contact with the limit block on the shell 1. At this time, the baffle plate 5 blocks all the heat dissipation holes 401 to isolate the air inside and outside the shell 1, thereby gradually reducing the fire source inside the shell 1 until it is extinguished, thereby suppressing the spread of the fire in the shell 1 and reducing the damage to other electrical components in the shell 1.

[0035] When utilizing photovoltaic power generation, there are two ways to connect the cables between the combiner box and the solar cell array. One is to insert the cables into the combiner box and connect them to the corresponding terminals. The other is to connect them directly outside the combiner box through waterproof connectors. However, the connection method using waterproof connectors has the disadvantage of having many connection positions (i.e., the connection between the waterproof connector and the internal components of the combiner box and the connection between the waterproof connector and the cables). Compared with the first connection method, poor contact at the connection position is more likely to occur, and the workload of daily inspection and maintenance is increased. Therefore, the first method is usually used to connect the cables to the combiner box in some occasions. However, when using the first method, due to the influence of the external environment (for example, the offshore photovoltaic system is affected by waves), the cables will shake, causing the cables to be pulled, resulting in a false connection or detachment between the cables and the terminals.

[0036] Example 2: Based on Example 1, please refer to Figure 2 and Figure 4-Figure 6 , and also includes a plurality of fixed seats 9 that are equidistant and symmetrically distributed. The fixed seats 9 are slidably connected to the lower side of the shell 1. The upper part of the fixed seat 9 is fixedly connected with a fixing piece 10. The upper part of the fixed seat 9 passes through the lower side of the shell 1 and is threadedly connected with a fastener 11. The lower part of the fixed seat 9 is slidably matched with an end cover 12. There are three protrusions on the upper part of the inner side of the end cover 12. The upper part of the end cover 12 is made of elastic material. The lower part of the fixed seat 9 is provided with an annularly distributed L-shaped groove 121. The L-shaped groove 121 is used for the adjacent protrusions on the adjacent end covers 12 to slide. The upper and lower limit sliding connections in the fixed seat 9 are provided with a sliding ring 13. A spring is fixedly connected between the lower side of the sliding ring 13 and the adjacent fixed seat 9. The upper side of the sliding ring 13 is fixedly connected with three annularly distributed extrusions 14. The extrusion 14 is P-shaped. The elastic coefficient of the end cover 12 is greater than the elastic coefficient of the extrusion 14. The end cover 1 The protrusion on 2 is used to extrude the adjacent extrusion pieces 14 and deform the extrusion pieces 14 to clamp the cables. The fixing seat 9 is provided with an annularly distributed limiting hole 141, and the limiting hole 141 is limitedly matched with the adjacent extrusion pieces 14. Initially, the upper part of the extrusion piece 14 is located in the adjacent limiting hole 141, and the limiting hole 141 is connected with the end of the adjacent L-shaped groove 121. The protrusion of the end cover 12 is extruded and matched with the adjacent L-shaped groove 121 to deform the upper part of the end cover 12. The extrusion piece 14 is extruded and matched with the adjacent protrusions on the adjacent end cover 12 to extrude the three extrusion pieces 14 so that the extrusion pieces 14 clamp the cables. The elastic coefficient of the spring between the sliding ring 13 and the adjacent fixing seat 9 is greater than the elastic coefficient of the deformation of the extrusion piece 14. The spring between the sliding ring 13 and the adjacent fixing seat 9 is used to push the sliding ring 13 and the three extrusion pieces 14 to reset.

[0037] Please refer to Figure 6-Figure 8, the upper side of the annularly distributed extrusion members 14 are fixedly connected with a pull rope 15, and the upper and lower limit sliding connections are connected with a transposition ring 16 in the fixed seat 9. The three pull ropes 15 are fixedly connected to the lower side of the adjacent transposition ring 16, and a tension spring is fixedly connected between the upper side of the transposition ring 16 and the adjacent fixed seat 9. The elastic coefficient of the tension spring between the transposition ring 16 and the adjacent fixed seat 9 is greater than the elastic coefficient of the spring between the sliding ring 13 and the adjacent fixed seat 9. Six symmetrical and annularly distributed connecting plates 17 are fixedly connected in the transposition ring 16. Two symmetrically distributed connecting plates 17 on the same transposition ring 16 are fixedly connected with a clamping member 18. When the clamping member 18 is subjected to excessive force, the two adjacent connecting plates 17 can be deformed. The position near the three clamping members 18 on the transposition ring 16 is made of elastic material. The same fixed seat 9, the annularly distributed clamping members 18 and the annularly distributed extrusion members 14 are staggered to improve the effect of clamping the cable. An annularly distributed upper reset groove 181 is provided in the fixing seat 9, and the upper reset groove 181 is limited to cooperate with the adjacent clamping member 18. Initially, the clamping member 18 is located in the adjacent upper reset groove 181, and an annularly distributed lower reset groove 182 is provided in the fixing seat 9. The lower reset groove 182 is limited to cooperate with the adjacent extrusion member 14 to reset the extrusion member 14 and release the clamping of the cable. The height of the connecting plate 17 is lower than the height of the adjacent clamping member 18, and the width of the clamping member 18 in the horizontal direction is greater than its thickness in the vertical direction, so that when the cable pulling force is too large, the clamping member 18 can release the clamping of the cable.

[0038] Please refer to Figure 4 , Figure 8 and Fig. 9 A plurality of elastic sheets 19 distributed in an annular manner are fixedly connected to the lower part of the fastener 11. The side of the elastic sheet 19 away from the axis of the fixing seat 9 contacts and cooperates with the adjacent fastener 11. A plurality of limiting grooves 191 distributed in an annular manner are provided on the upper part of the fixing seat 9. In the clockwise direction (top view), the depth of the limiting groove 191 gradually decreases. The elastic sheet 19 is limitedly cooperated with the adjacent limiting grooves 191 to prevent the fastener 11 and the adjacent fixing seat 9 from loosening due to vibration. The height of the limiting groove 191 is greater than the sum of the thickness of the shell 1 and the height of the elastic sheet 19, which is used to ensure that the elastic sheet 19 can be limitedly cooperated with the adjacent limiting grooves 191. An upper sealing ring 20 is fixedly connected to the upper side of the fixing member 10, and the upper sealing ring 20 is squeezed and fitted with the shell 1.

[0039] Please refer to Figure 5 and Figure 8 A lower sealing ring 21 is fixedly connected to the end cover 12, and an annular inclined surface 211 is provided on the lower side of the fixing seat 9. The annular inclined surface 211 is squeezed and matched with the adjacent lower sealing ring 21 to deform the lower sealing ring 21 toward its central axis and fit tightly against the cable.

[0040] Please refer to Figure 8 and Fig.10A blocking piece 22 is pasted on the end cover 12. The blocking piece 22 is made of a flexible material. A plurality of arc-shaped grooves 221 are provided on the end cover 12. The grooves 221 are convenient for workers to rotate the end cover 12. The blocking piece 22 contacts with adjacent grooves 221 to make the two sides of the blocking piece 22 suspended, so that the workers can tear off the blocking piece 22. The blocking piece 22 is sealed with the adjacent fixing seat 9.

[0041] When installing the photovoltaic power generation system, the worker installs the housing 1 to the corresponding position, then inserts the fixing seat 9 into the corresponding position on the lower side of the housing 1 (hereinafter described as a group of fixing seats 9 and their related parts), and rotates the fastener 11 to connect the fastener 11 with the fixing seat 9 through threads. During this process, the fastener 11 drives the fixing seat 9 and the fixing member 10 to move upward, so that the distance between the fixing member 10 and the housing 1 is gradually reduced, and the upper sealing ring 20 is squeezed to deform, and the gap between the fixing seat 9 and the housing 1 is sealed by the upper sealing ring 20. As the fastener 11 The fixing seat 9 is driven to move upward, and the elastic sheet 19 gradually corresponds to the corresponding limiting groove 191. Then, the elastic sheet 19 bends under its own elastic action and enters the adjacent limiting groove 191. As the fastener 11 rotates, the fastener 11 drives several elastic sheets 19 to rotate. The elastic sheets 19 contact the adjacent limiting grooves 191 in turn, and the elastic sheets 19 are repeatedly bent and reset. Until the fastener 11 finally stops rotating, the elastic sheet 19 bends and limits the fastener 11 through the adjacent limiting grooves 191, thereby improving the firmness of the connection between the fastener 11 and the fixing seat 9.

[0042] When connecting the cables of the solar cell array to the components in the shell 1, first pass the cables through the corresponding end caps 12, the fixing seat 9, the sliding ring 13 and the transposition ring 16, and then connect the cables to the corresponding wiring terminals in the shell 1. After completing the cable connection, the worker continues to convey the cables into the shell 1 so that the portion of the cables located in the shell 1 is in a bent state. At this time, the worker pushes the end cap 12 upward, and the protrusions on the end cap 12 contact and squeeze the adjacent L-shaped grooves 121, so that the upper part of the end cap 12 is deformed, and the protrusions on the end cap 12 slide along the adjacent L-shaped grooves 121 respectively. After the end cap 12 moves up, it rotates counterclockwise until the protrusions on the end cap 12 move to the end of the adjacent L-shaped grooves 121. The protrusions on the end cap 12 are reset under the action of their own elasticity and enter the adjacent limiting holes 141, and squeeze the adjacent extrusions 14, so that the extrusions 14 are bent and contact the outer side of the cable, and the cable is clamped. At this time, the protrusions on the end cap 12 are coplanar with the inner side of the fixing seat 9.

[0043] During the process of installing the end cover 12 onto the fixing seat 9, the end cover 12 drives the lower sealing ring 21 to move, and the lower sealing ring 21 finally contacts the annular inclined surface 211, so that the lower sealing ring 21 is deformed toward the direction close to its central axis under the extrusion of the annular inclined surface 211, and finally the lower sealing ring 21 fits the cable to seal the gap between the cable and the fixing seat 9.

[0044] After completing the connection between the cables and the wiring terminals in the shell 1, if the number of cables is less than the number of fixing seats 9, the fixing seats 9 cannot be fully utilized. At this time, the shell 1 can be connected to the outside through the fixing seats 9, affecting the sealing inside the shell 1. The solution is as follows: the worker tears off the sealing piece 22 on the end cover 12 (that is, the end cover 12 that is not in contact with the cable), and then sticks the sealing piece 22 to the lower side of the corresponding fixing seat 9, repeats the above steps, and connects the end cover 12 with the corresponding fixing seat 9. During this process, the lower sealing ring 21 squeezes the sealing piece 22, so that the sealing piece 22 and the lower sealing ring 21 cooperate to seal the lower side of the fixing seat 9, thereby reducing the impact of the external environment on the environment inside the shell 1 through the fixing seat 9.

[0045] When the cable shakes, the cable will be pulled outward from the shell 1. At this time, the cable drives the sliding ring 13 and the three extrusion members 14 to move downward, and compresses the spring adjacent to the sliding ring 13, and uses the spring to buffer the pulling force of the cable. At the same time, the extrusion member 14 drives the transposition ring 16 to move downward through the adjacent pull rope 15, and stretches the tension spring adjacent to the transposition ring 16. The transposition ring 16 drives the six connecting plates 17 and the three clamping members 18 to move downward. During the downward movement of the clamping member 18, the clamping member 18 is squeezed by the adjacent upper reset groove 181 and moves toward the direction close to the central axis of the fixed seat 9, so that the elastic part of the transposition ring 16 is deformed, and finally the three clamping members 18 clamp the cable. In this way, when the cable is pulled, the pulling force is buffered by compressing the spring and stretching the tension spring to prevent damage between the cable and the terminal block caused by hard pulling.

[0046] After the three extrusion pieces 14 clamp the cable together, as time goes by, irreversible pits appear at the position where the insulation layer of the cable contacts the extrusion piece 14, resulting in a reduction in the clamping force of the extrusion piece 14 on the cable. At the same time, the insulation capacity of the cable is reduced due to the deformation of the insulation layer. The solution is as follows: when the cable is pulled, repeat the above-mentioned steps of pulling the sliding ring 13, the extrusion piece 14, the transposition ring 16 and the clamping piece 18 downward, until the adjacent spring of the sliding ring 13 is compressed to the limit, the extrusion piece 14 corresponds to the adjacent lower reset groove 182, at this time, the extrusion piece 14 is reset under its own elastic action, and enters the adjacent lower reset groove 182, the extrusion piece 14 releases the clamping of the cable, as the cable continues to be pulled, the cable pulls the transposition ring 16 and the clamping piece 18 downward, and continues to stretch the tension spring adjacent to the transposition ring 16, in this process, the pull rope 15 is converted from a taut state to a relaxed state, until the transposition ring 16 contacts the upper side of the extrusion piece 14, and the transposition ring 16 stops moving downward.

[0047] When the transposition ring 16 stops moving downward, the cable stops moving downward due to the limiting effect of the clamping member 18. When the shaking of the cable weakens and the pulling force on the cable is reduced, the transposition ring 16 pulls the cable upward through the clamping member 18 under the action of the adjacent tension spring. At this time, since the elastic coefficient of the spring between the sliding ring 13 and the adjacent fixed seat 9 is greater than the elastic coefficient of the deformation of the extrusion member 14, when the transposition ring 16 loses contact with the upper side of the extrusion member 14, the sliding ring 13 pushes the three extrusion members 14 upward under the action of the adjacent springs, causing the extrusion member 14 to lose contact with the adjacent lower reset groove 182, and re-clamp the cable (at this time, the contact position of the extrusion member 14 with the cable changes, and the pull rope 15 is in a relaxed state).

[0048] As the transposition ring 16 moves upward, the sliding ring 13 gradually resets, and then the transposition ring 16 continues to drive the cable upward through the three clamping members 18. The cable drives the sliding ring 13 upward through the three extrusion members 14 and stretches the springs adjacent to the sliding ring 13 until the transposition ring 16 is reset. The clamping members 18 correspond to the adjacent upper reset grooves 181 and release the clamping of the cable. At this time, the sliding ring 13 is reset under the action of the adjacent springs, so that the pull rope 15 is in a taut state again, thereby changing the contact position of the extrusion member 14 with the cable to prevent the cable insulation from deformation.

[0049] In an offshore photovoltaic system, if the pulling force of the cable is too large, it is easy to cause the shell 1 to deform or the cable to break. In order to avoid the above problems and reduce the firmness of the fixation between the cable and the shell 1, the following operations need to be performed: while the cable is being pulled, repeat the above-mentioned cable pulling transposition ring 16 downward step until the transposition ring 16 contacts the upper sides of the three extrusion members 14 and stops moving downward. The cable continues to move downward and drives the three clamping members 18 to roll, so that the clamping member 18 rotates 90° along its own central axis and deforms the two adjacent connecting plates 17, so that the upper side of the original clamping member 18 contacts the cable, reducing the clamping force on the cable. Subsequently, the cable is disconnected from the corresponding terminal in the shell 1, and finally the cable loses contact with the corresponding fixing seat 9, preventing the cable from being subjected to excessive pulling force, resulting in the middle of the cable breaking, or pulling and damaging the shell 1. In this way, the position where the cable breaks is controlled, which is convenient for workers to repair and replace.

[0050] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present application, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of this application.

Claims

1. A photovoltaic power generation combiner box with a high temperature protection structure, comprising a shell, the shell is hinged with an outer cover, a mounting plate is detachably installed in the shell, the shell is provided with equidistant and symmetrically distributed heat dissipation holes, and the outer side of the shell is fixed with guide plates near the equidistant and symmetrically distributed heat dissipation holes, wherein: It also includes a shielding plate, which is sealingly slidably connected to a position in the shell near the guide plates that are equidistant and symmetrically distributed, a detection member is fixedly connected to the shell, and gas is stored in the detection member, a push rod is sealingly slidably connected to the detection member, and the push rod is fixedly connected to the shielding plate, a limit ball is slidably connected to a position in the shell near the push rod, a spring is fixedly connected between the limit ball and the shell, and the limit ball is limitedly matched with the push rod; The invention also comprises a fixing seat which is equidistant and symmetrically distributed, the fixing seat being slidably connected to the shell, a fixing piece being fixedly connected to the fixing seat, the fixing seat passing through the shell and being threadedly connected to a fastener, an end cap being slidably matched with a position of the fixing seat away from the adjacent fastener, an L-shaped groove which is distributed in an annular manner and is used for sliding of the adjacent end cap, a sliding ring is connected with limited sliding in the fixing seat, a spring is fixedly connected between the side of the sliding ring away from the shell and the adjacent fixing seat, an extrusion piece which is distributed in an annular manner is fixedly connected to the side of the sliding ring away from the adjacent fixing piece, limiting holes which are distributed in an annular manner and are respectively limitedly matched with the adjacent extrusion pieces are provided on the fixing seat, the limiting holes are communicated with the adjacent L-shaped grooves, the end caps are extrusion-matched with the adjacent L-shaped grooves, and the extrusion piece is extrusion-matched with the adjacent end caps; A pull rope is fixedly connected to the side of the annularly distributed extrusion parts away from the adjacent sliding ring, and a transposition ring is connected to the fixed seat in a limited sliding manner. The pull rope is fixed to the adjacent transposition ring, and a tension spring is fixedly connected between the side of the transposition ring away from the adjacent sliding ring and the adjacent fixed seat. A symmetrical and annularly distributed connecting plate is fixed in the transposition ring, and the symmetrically distributed connecting plates on the same transposition ring are commonly fixed with a clamping part, and an annularly distributed upper reset groove is arranged in the fixed seat and respectively cooperates with the adjacent clamping parts in a limited manner, and a annularly distributed lower reset groove is arranged in the fixed seat and respectively cooperates with the adjacent extrusion parts in a limited manner.

2. The photovoltaic power generation combiner box with a high temperature protection structure according to claim 1 is characterized in that: The height of the connecting plate is lower than the height of the adjacent clamping member, and the width of the clamping member in the horizontal direction is greater than the thickness in the vertical direction, so that the clamping member can release the clamping of the cable.

3. The photovoltaic power generation combiner box with a high temperature protection structure according to claim 1 is characterized in that: On the same fixing seat, the annularly distributed clamping members and the annularly distributed extruding members are alternately distributed to improve the clamping effect of the cable.

4. The photovoltaic power generation combiner box with a high temperature protection structure according to claim 1 is characterized in that: The elastic coefficient of the tension spring between the transposition ring and the adjacent fixing seat is greater than the elastic coefficient of the spring between the sliding ring and the adjacent fixing seat, and the elastic coefficient of the spring between the sliding ring and the adjacent fixing seat is greater than the elastic coefficient of the deformation of the extrusion piece.

5. The photovoltaic power generation combiner box with a high temperature protection structure according to claim 1 is characterized in that: An elastic sheet distributed in an annular shape is fixed inside the fastener, and an annular limiting groove is provided on the fixing seat near the position of the adjacent fastener. The elastic sheet is limitedly matched with the adjacent limiting groove. An upper sealing ring is fixed to one side of the fixing member near the adjacent fastener, and the upper sealing ring is extruded and matched with the shell.

6. The photovoltaic power generation combiner box with a high temperature protection structure according to claim 5 is characterized in that: The height of the limiting groove is greater than the sum of the thickness of the shell and the height of the elastic sheet.

7. The photovoltaic power generation combiner box with a high temperature protection structure according to claim 5 is characterized in that: A lower sealing ring is fixedly connected inside the end cover, and an annular inclined surface is provided on the fixing seat at a position away from the adjacent fastener. The annular inclined surface is squeezed and matched with the adjacent lower sealing ring to make the lower sealing ring close to the cable.

8. The photovoltaic power generation combiner box with a high temperature protection structure according to claim 7 is characterized in that: A blocking piece is pasted on the end cover, and arc-shaped grooves are arranged on the end cover. The blocking piece contacts the adjacent grooves, and the blocking piece is blocked and matched with the adjacent fixing seat.

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