Explosion-proof photovoltaic inverter and power generation system

Abstract

The explosion-proof photovoltaic inverter comprises a box body, a door plate and fixing parts, the door plate is installed at an opening of the box body and connected with the edge of the opening of the box body through the fixing parts, the number of the fixing parts is multiple, and the fixing parts are distributed along the edge of the opening of the box body. The connection strength of all the fixing pieces located in the first set area on the door plate is smaller than that of all the fixing pieces located in the second set area on the door plate, so that after the door plate is subjected to explosion impact in the box body, the fixing pieces in the first set area relieve the constraint between the door plate and the box body; and the box body opening is partially opened corresponding to the first set area, so that the interior of the box body is communicated with the external environment. The explosion-proof photovoltaic inverter is simple in structure, easy to process and low in explosion-proof measure setting cost, effectively controls the damage range and degree of explosion, and has good explosion-proof reliability and explosion-proof effect. The invention further provides a power generation system.

Description

Technical Field

[0001] The present invention specifically relates to an explosion-proof photovoltaic inverter and a power generation system. Background Art

[0002] As a core component in the photovoltaic business, the inverter is moving towards high power and high density. As the power of string inverters increases, the internal capacitors increase. When the string inverter breaks down due to overvoltage, it will gradually release flammable gas. When the flammable gas accumulates to a certain concentration, the inverter will break down and cause a short circuit. The external solar photovoltaic panel will continue to input energy into the inverter. The short circuit will cause continuous arcing or sparking, which will cause the flammable gas to explode with great power. The existing industry chassis door panel connection strength of string inverters is weak, and the door panel is very easy to be blown away, and there is a certain possibility of injury, causing safety accidents.

[0003] At present, the structure of high-power inverters on the market is all IP66 (a kind of shell protection level) fully enclosed structure, with a large number of electrolytic capacitors and gold film capacitors arranged inside. This structural method brings the following problems: (1) There are many capacitors inside the inverter, which will release flammable gases after short circuit; (2) The chassis is an IP66 fully enclosed structure, and flammable gases cannot be discharged. The concentration of flammable gases inside the box will gradually increase and reach the explosion range; (3) The door panel area of ​​the inverter is large, and the force-bearing area is also large. After the inverter explodes, the impact force on the door panel is very large, which is easy to cause the aforementioned safety accidents. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an explosion-proof photovoltaic inverter in view of the above-mentioned deficiencies in the prior art. The inverter has a simple structure, is easy to process, has low explosion-proof measures and can effectively control the scope and degree of damage caused by the explosion, and has good explosion-proof reliability and explosion-proof effect. The present invention also provides a power generation system.

[0005] The present invention provides an explosion-proof photovoltaic inverter, comprising a box body, a door panel and a fixing part. The door panel is installed at the opening of the box body and connected to the edge of the box body opening through the fixing part. There are multiple fixing parts, each of which is distributed along the edge of the box body opening, and the connection strength of each fixing part in a first set area on the door panel is smaller than the connection strength of each fixing part in a second set area on the door panel, so that after the door panel is impacted by an explosion in the box body, the fixing parts in the first set area release the constraints between the door panel and the box body, and partially open the box body opening corresponding to the first set area, so that the inside of the box body is connected with the external environment.

[0006] Furthermore, the box opening and the door panel are both rectangular structures, the first set area is a fan-shaped area including a corner of the door panel, and the second set area is the remaining area on the door panel except the first set area.

[0007] Furthermore, within the first set area, the connection strength of multiple fixings near a corner of the door panel is less than the connection strength of other fixings within the first set area, and the first set area is divided into a primary release area and a secondary release area according to the connection strength of the fixings from weak to strong, so that after the door panel is impacted by the explosion inside the box, the fixings in the first set area gradually release the constraints on the door panel and the box body according to the connection strength, so that the box opening gradually opens corresponding to the primary release area and the secondary release area.

[0008] Furthermore, the fixing parts include self-clinching screws, which pass through the edge of the box opening from the side of the box away from the door panel to the side close to the door panel, and are connected to the door panel through a threaded portion so that the head of the self-clinching screw contacts and clamps the box. The connection strength of each fixing part is set by setting the size of the contact area between the head of the self-clinching screw and the edge of the box opening.

[0009] Furthermore, each fixing part within the first set area directly contacts and clamps the box body through the head of the self-clinching screw; each fixing part within the second set area also includes a reinforcing plate, which is attached to the surface of the box body away from the door panel. In each fixing part within the second set area, the head of the self-clinching screw is welded to the reinforcing plate to increase the equivalent contact area between the head of the self-clinching screw and the box body.

[0010] Furthermore, the fixing member also includes a support member and a fixing screw, the support member is arranged between the door panel and the edge of the box opening, the threaded portion of the rivet screw is connected to the support member, the fixing screw passes through the door panel from the side of the door panel away from the box body to the side close to the box body, and is connected to the support member through the threaded portion so that the head of the fixing screw contacts and clamps the door panel.

[0011] Furthermore, the fixing member also includes a gasket, which is arranged between the head of the fixing screw and the door panel to prevent the head of the fixing screw from falling out of the door panel after the door panel is impacted by an explosion in the box.

[0012] Furthermore, the door panel has a through hole at the position where the fixing screw is set, and the through hole is a countersunk hole that is circumferentially recessed toward one side of the box body. The gasket includes a convex gasket and a flat gasket. The convex gasket has a sinking area corresponding to the countersunk hole structure in the middle part, the convex gasket is stuck in the countersunk hole, and the flat gasket is set in the sinking area of ​​the convex gasket, and is cushioned between the head of the fixing screw and the convex gasket.

[0013] Furthermore, the edge of the door panel is provided with a folded edge bent toward the box body side, so that the door panel is in a box shape covering the edge of the box body opening.

[0014] Furthermore, a notch is provided at the intersection of the critical line between the areas on the door panel and the edge of the door panel.

[0015] The present invention also provides a power generation system, including a solar cell array, a control cabinet, a transformer and the above-mentioned explosion-proof photovoltaic inverter, the solar cell array is electrically connected to the explosion-proof photovoltaic inverter, and is used to convert solar energy into electrical energy and output direct current; the explosion-proof photovoltaic inverter is electrically connected to the transformer, and is used to process the direct current and output alternating current; the transformer is electrically connected to the power grid, and is used to increase the voltage of the alternating current and input it into the power grid; the control cabinet is electrically connected to the solar cell array, the transformer and the explosion-proof photovoltaic inverter, and is used to distribute and protect the power generation system.

[0016] The explosion-proof photovoltaic inverter of the present invention uses a fixing member to connect the box and the door panel, but unlike the conventional connection form, the connection strength of the fixing member is not consistent, but the connection strength in the first setting area is weaker, and the connection strength in the second setting area is stronger. This setting structure makes the door panel in the first setting area easier to separate from the box than the second setting area. Therefore, when an explosion occurs in the box, the impact force will first open the door panel in the first setting area, and when the box opening is partially opened corresponding to the first setting area, the inside of the box is already connected to the external environment, so that the internal high-pressure gas can be released, and pressure relief has been achieved. Therefore, the remaining pressure is not enough to break open the fixing member with stronger connection strength in the second setting area, ensuring that the door panel remains at the box opening, avoiding the possibility of equipment damage and injury caused by the door panel blowing off. It can be seen that this structure has good explosion-proof reliability and explosion-proof effect, improves the use safety while completing the explosion pressure relief, and does not change the original overall structure of the inverter. The setting cost is low and it is easy to process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of an explosion-proof photovoltaic inverter in Embodiment 1 of the present invention;

[0018] Figure 2 This is a schematic diagram of the regional distribution of the door panels of the explosion-proof photovoltaic inverter in Example 1 of the present invention;

[0019] Figure 3 This is a schematic diagram of the connection between the fixing part of the explosion-proof photovoltaic inverter and the box in Embodiment 1 of the present invention;

[0020] Figure 4 This is a schematic diagram of the connection between the fixing part and the box of the second setting area of ​​the explosion-proof photovoltaic inverter in Example 1 of the present invention;

[0021] Figure 5 It is a schematic diagram of the connection structure of the fixing parts of the first-level release area of ​​the explosion-proof photovoltaic inverter in Example 1 of the present invention;

[0022] Figure 6 It is a schematic diagram of the connection structure of the fixing parts of the secondary release area of ​​the explosion-proof photovoltaic inverter in Example 1 of the present invention;

[0023] Figure 7 It is a schematic diagram of the connection structure of the fixing parts of the second setting area of ​​the explosion-proof photovoltaic inverter in Example 1 of the present invention;

[0024] Figure 8 It is a schematic diagram of the position of the notch of the explosion-proof photovoltaic inverter in Example 1 of the present invention.

[0025] In the figure: 1, box body; 2, door panel; 21, first setting area; 22, second setting area; 23, notch; 3, fixing piece; 31, rivet screw; 32, reinforcing plate; 33, supporting piece; 34, fixing screw; 35, gasket; 351, convex gasket; 352, flat gasket; 36, nut. DETAILED DESCRIPTION

[0026] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of the present invention.

[0027] In the description of the present invention, it should be noted that the terms "upper", "lower" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience and simplification of the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0028] In the description of the present invention, the terms “first”, “second” and “third” are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connect", "set", "install", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0030] Example 1

[0031] like Figure 1 and Figure 2 As shown, the explosion-proof photovoltaic inverter of this embodiment includes a box body 1, a door panel 2 and a fixing member 3. The door panel 2 is installed at the opening of the box body 1 and connected to the opening edge of the box body 1 through the fixing member 3. A plurality of fixing members 3 are provided, and each fixing member 3 is distributed along the opening edge of the box body 1. The connection strength of each fixing member 3 in the first set area 21 on the door panel 2 is less than the connection strength of each fixing member 3 in the second set area 22 on the door panel 2, so that after the door panel 2 is impacted by the explosion in the box body 1, the fixing member 3 in the first set area 21 releases the constraint between the door panel 2 and the box body 1, and partially opens the opening of the box body 1 corresponding to the first set area 21, so that the inside of the box body 1 is connected with the external environment.

[0032] The explosion-proof photovoltaic inverter of this embodiment uses a fixing member 3 to connect the box body 1 and the door panel 2. However, unlike the conventional connection form, the connection strength of the fixing member 3 is not consistent, but the connection strength in the first setting area 21 is weaker, and the connection strength in the second setting area 22 is stronger. This setting structure makes the door panel 2 in the first setting area 21 easier to separate from the box body 1 than the second setting area 22. Therefore, when an explosion occurs in the box body 1, the impact force will first open the door panel 2 in the first setting area 21. When the opening of the box body 1 is partially opened corresponding to the first setting area, the inside of the box body 1 is already connected to the external environment, so that the internal high-pressure gas can be released and pressure relief has been achieved. Therefore, the remaining pressure is not enough to break open the fixing member 3 with stronger connection strength in the second setting area 22, ensuring that the door panel 2 is retained at the opening of the box body 1, avoiding the possibility of equipment damage and injury caused by the door panel 2 blowing off. It can be seen that this structure has good explosion-proof reliability and explosion-proof effect, improves the use safety while completing the explosion pressure relief, and does not change the original overall structure of the inverter. The setting cost is low and it is easy to process.

[0033] In this embodiment, the opening of the box body 1 and the door panel 2 are both rectangular structures, the first set area 21 is a fan-shaped area including a corner of the door panel 2, and the second set area 22 is the remaining area on the door panel 2 except the first set area 21. In this layout, the first set area 21 can be opened from the corner area of ​​the rectangle. First, the force in this area is more concentrated, and it is easier to open than the side. Secondly, the fan-shaped opening formed when opening from the corner is larger than the narrow slit-shaped opening at the side, which is more convenient for discharging high-pressure gas, and it is easier to release pressure. In addition, the impact force that needs to be borne by the other corner point on the diagonal line with the corner point of the opening is smaller, and this impact will gradually decrease with the pressure release, further improving the reliability of the door panel 2 remaining on the box body 1.

[0034] In this embodiment, in the first setting area 21, the connection strength of multiple fixings 3 near a corner of the door panel 2 is less than the connection strength of the remaining fixings 3 in the first setting area 21, and the first setting area 21 is divided into a primary release area and a secondary release area according to the connection strength of the fixings 3 from weak to strong, so that after the door panel 2 is impacted by the explosion in the box body 1, the fixings 3 in the first setting area 21 gradually release the constraints on the door panel 2 and the box body 1 according to the connection strength, so that the opening of the box body 1 gradually opens corresponding to the primary release area and the secondary release area.

[0035] Since the first setting area 21 is a fan-shaped area including a corner of the door panel 2, the primary release area is a smaller fan-shaped area including a corner of the door panel 2, and the secondary release area is an arc-shaped belt-shaped area outside the primary release area. Through this structural layout setting of gradually releasing the constraints according to the intensity and gradually opening the opening in stages, the pressure relief capacity of the door panel 2 when it is impacted can be further improved, and the connection stability of the fixing member 3 in the second setting area 22 can be improved when the door panel 2 is impacted.

[0036] In this embodiment, Figure 3 and Figure 4 As shown, the fixing member 3 includes a rivet screw 31, which passes through the opening edge of the box body 1 from the side of the box body 1 away from the door panel 2 to the side close to the door panel 2, and is connected to the door panel 2 through the threaded portion, so that the head of the rivet screw 31 contacts and clamps the box body 1. Each fixing member 3 is set to achieve the size of the connection strength by setting the size of the contact area between the head of the rivet screw 31 and the opening edge of the box body 1. That is, in this embodiment, when the fixing member 3 releases the constraint between the door panel 2 and the box body 1, the fixing member 3 is mainly separated from the box body 1, but still remains on the door panel 2. This setting method can adjust the connection strength by setting the head size of the rivet screw 31, and the structure is simpler. At the same time, it does not affect the connection performance of the door panel 2 under normal conditions, so that the door panel 2 can not only release pressure under abnormal conditions, but also ensure the working reliability of the inverter under normal conditions.

[0037] Specifically, Figures 5 to 7 As shown, each fixing part 3 in the first setting area 21 directly contacts and clamps the box body 1 through the head of the rivet screw 31; wherein, the head diameter of the rivet screw 31 of the fixing part 3 located in the first-level release area is smaller than the head diameter of the rivet screw 31 of the fixing part 3 located in the second-level release area; each fixing part 3 in the second setting area 22 also includes a reinforcing plate 32, and the reinforcing plate 32 is attached to the surface of the box body 1 away from the door panel 2. In each fixing part 3 in the second setting area 22, the head of the rivet screw 31 is welded to the reinforcing plate 32 to increase the equivalent contact area between the head of the rivet screw 31 and the box body 1.

[0038] In this embodiment, the first-level release area adopts M5 standard self-clinching screws 31 (screw head diameter 6.9mm); the second-level release area adopts M5 non-standard big-head self-clinching screws 31 (screw head diameter 11mm); the second setting area 22 adopts M5 non-standard big-head self-clinching screws 31 plus a welded reinforcement plate 32 structure. The non-standard big-head self-clinching screws 31 are crimped on the box body 1 to achieve locking of the door panel 2 fixing part 3 and meet the sealing requirements of the box body. A welding reinforcement plate 32 is added to the head of the self-clinching screw 31, and the welding reinforcement plate 32 is connected to the self-clinching screw 31 by argon arc welding. Since the welding reinforcement plate 32 greatly increases the contact area between the fixing part 3 and the chassis, the tension of the screw is increased, thereby ensuring the reliable connection of the second setting area 22.

[0039] Since the head diameter of the standard self-clinching screw 31 is small and the tensile force it can withstand is small, under the huge impact force of the explosion, the standard self-clinching screw 31 falls off quickly, and the first-level release area is first deformed and pressure relieved, followed by the fall-off of the non-standard large-head self-clinching screw 31 in the second-level release area, and the deformation and pressure relief in the second-level release area. At this time, the impact force on the door panel 2 is sharply reduced, and the door panel 2 is firmly fixed on the box body 1 under the strong fixation of the second set area 22 structure, thereby realizing the explosion-proof function.

[0040] In this embodiment, the fixing member 3 also includes a support member 33 and a fixing screw 34. The support member 33 is arranged between the door panel 2 and the opening edge of the box body 1. The threaded portion of the rivet screw 31 is connected to the support member 33. The fixing screw 34 passes through the door panel 2 from the side of the door panel 2 away from the box body 1 to the side close to the box body 1, and is connected to the support member 33 through the threaded portion, so that the head of the fixing screw 34 contacts and clamps the door panel 2. By providing this support member 33, the fixing member 3 itself will not directly fall off from the door panel 2 after being separated from the box body 1, so as to avoid flying out and causing damage to the equipment or injuring the staff. Specifically, two rivet screws 31 and one fixing screw 34 are provided in one fixing member 3; the support member 33 is provided with two through holes for allowing the rivet screws 31 to pass through on the side facing the box body 1, and a threaded hole for connecting the fixing screw 34 is provided on the side facing the door panel 2. The rivet screw 31 passes through the through hole of the support member 33 and is fastened by the nut 36.

[0041] In this embodiment, the fixing member 3 also includes a gasket 35, which is arranged between the head of the fixing screw 34 and the door panel 2 to improve the connection strength between the fixing screw 34 and the door panel 2, so as to prevent the head of the fixing screw 34 from being disengaged from the door panel 2 after the door panel 2 is impacted by the explosion in the box body 1. Since the presence of the gasket 35 ensures the connection strength between the fixing member 3 and the door panel 2, the fixing member 3 will not be separated from the door panel when the door panel 2 is impacted, thereby ensuring that the fixing member 3 in the second setting area 22 can ensure the connection with both the door panel 2 and the box body 1, that is, the door panel 2 and the box body 1 in the second setting area 22 will not be disengaged. In this embodiment, the gasket 35 makes the connection strength between the head of the fixing screw 34 and the door panel 2 greater than the connection strength between the rivet screw 31 and the box body 1 in the first setting area 21.

[0042] In this embodiment, the door panel 2 is provided with a through hole at the location where the fixing screw 34 is set, and the through hole is a countersunk hole that is circumferentially recessed toward one side of the box body 1. The gasket 35 includes a convex gasket 351 and a flat gasket 352. The middle of the convex gasket 351 has a sinking area corresponding to the countersunk hole structure. The convex gasket 351 is stuck in the countersunk hole, and the flat gasket 352 is set in the sinking area of ​​the convex gasket 351, and is padded between the head of the fixing screw 34 and the convex gasket 351. The convex gasket 351 combined with the countersunk hole structure strengthens the structural strength of the door panel 2 in the circumferential direction of the hole. This arrangement further improves the connection strength between the head of the fixing screw 34 and the door panel 2.

[0043] In this embodiment, the edge of the door panel 2 is provided with a folded edge bent toward the box body 1, so that the door panel 2 is in a box shape covered outside the opening edge of the box body 1. This structure can not only improve the sealing performance, but also ensure the connection reliability, and also improve the structural strength of the door panel 2 itself.

[0044] In this embodiment, Figure 8 As shown, a notch 23 is provided at the intersection of the critical line between each area on the door panel 2 and the edge of the door panel 2. Specifically, the notch 23 is provided between the primary release area and the secondary release area, and between the first set area 21 and the second set area 22 (i.e., between the secondary release area 21 and the second set area 22). Even if the door panel 2 has the aforementioned folded edge, the primary release area and the secondary release area, and the first set area 21 and the second set area 22 can be more easily opened.

[0045] In this embodiment, the width of the notch 23 is 5 mm, which is convenient for parts processing and ensures the aesthetics of the product; the notch 23 extends upward from the bottom side of the folded edge of the door panel 2 to 5 mm away from the bend, that is, the length (or depth) of the notch 23 is the width of the folded edge of the door panel minus 5 mm. Figure 3 and Figure 4As shown, the bending processability is ensured, and the strength and sealing protection of the door panel 2 are ensured, while the strength of the door panel 2 during explosion-proofing is weakened, so as to facilitate the rapid deformation of the door panel 2 and release the pressure.

[0046] In general, in order to solve the problem that the flammable gas explosion caused by the short circuit of the internal capacitor of the existing photovoltaic inverter washes away the door panel and causes safety hazards, the present embodiment provides an inverter structure with simple structure, high processing efficiency, low investment cost, and high explosion-proof reliability. Due to the large size of the inverter box, the impact force applied to the box 1 and the door panel 2 after the explosion is very huge. If only relying on the method of increasing the strength of the box 1, the internal explosion force will not be released, and the four corners of the box 1 will be blown apart, causing a more dangerous explosion. Therefore, the present embodiment proposes a design concept of release + reinforcement, and the impact force of the explosion is quickly weakened by setting a release structure. At the same time, the connection strength of other areas is increased to improve the reliability of the connection, so that when an explosive mixed gas explosion occurs in the inverter, directional blasting is achieved through directional pressure relief and directional reinforcement, and finally the explosion-proof function of the inverter is realized. The main advantages of this device are as follows:

[0047] (1) Good explosion-proof effect and high reliability;

[0048] (2) Simple structure, high processing efficiency and low processing cost;

[0049] (3) It is highly versatile and can be applied to a variety of related structures.

[0050] The inverter structure mainly includes a box body 1, a door panel 2 and a fixing member 3 (including a rivet screw 31, a reinforcing plate 32, a support member 33, a fixing screw 34, a gasket 35 and a nut 36). The door panel 2 and the box body 1 are connected by the door panel fixing member 3. In this embodiment, 12 fixing members 3 are evenly arranged on the box body 1. The area where the three fixing members 3 near a corner of the door panel 2 in the first setting area 21 are located is a primary pressure relief and release area (primary release area), and the area where a fixing member 3 adjacent to the aforementioned three fixing members 3 is located is a secondary pressure relief and release area (secondary release area). These four fixing members 3 enable the door panel 2 to quickly perform primary and secondary deformation release after the inverter explodes, and quickly reduce the impact force of the explosion; the remaining eight fixing members 3 are reinforcement areas to ensure that the door panel 2 will not fall off under the impact force of the explosion. The primary and secondary deformation release and reinforcement areas are realized by designing different fixing structures on the box body. The connection structure on the door panel 2 is completely unified, which ensures the consistency of the inverter appearance. In addition, since the door panel 2 is in a four-sided bending shape and has high strength and rigidity, in order to ensure that the door panel 2 can be deformed quickly in a very short time and release the pressure generated by the explosion, a notch 23 is added at a suitable position of the door panel 2 to moderately weaken the strength and rigidity of the door panel 2 so that the door panel 2 can be deformed smoothly and quickly to release pressure. Finally, in order to prevent the fixing member 3 from falling off from the fixing hole of the door panel 2 under a huge impact force, a corresponding convex gasket 351 is added to the door panel 2 to prevent the fixing member 3 from falling off, so that the entire explosion-proof system can only fall off and release pressure from the correspondingly designed box rivet screw 31, thereby ensuring the consistency and safety of the inverter explosion pressure relief.

[0051] Figure 2 The distribution diagram of the release area (first set area 21) and the reinforcement area (second set area 22) of the photovoltaic inverter door panel of this embodiment. The release area of ​​the door panel 2 is about one third of the total area of ​​the door panel 2, and the fixed area is two thirds.

[0052] Figure 5 The figure is a schematic diagram of the connection structure of the first-level release area fixing part 3. The fixing part 3 is crimped onto the box body 1 using a standard M5 rivet screw 31. Since the standard screw rivet head is small in size (6.9mm in diameter), the single-side stress surface of the connection with the box body is less than 1mm, and the screw is subject to less tensile force. After the inverter explodes, the screw here will be quickly pulled off to achieve pressure relief and release.

[0053] Figure 6The figure is a schematic diagram of the connection structure of the fixing part 3 in the secondary release area. The fixing part 3 is crimped on the box body with a non-standard large-head M5 rivet screw 31. Due to the increase in the size and thickness of the screw rivet head, the diameter is increased from 6.9mm to 11mm, and the thickness is increased from 1mm to 2.5mm, which greatly increases the force-bearing area of ​​the screw head, increases the tensile strength, and improves the strength of the screw head itself. When the first-level pressure relief causes the door panel 2 to deform and impact, the secondary pressure relief is achieved and the impact force on the door panel 2 is reduced.

[0054] Figure 7 This is a schematic diagram of the connection structure of the fixing member 3 in the second setting area 22. A stainless steel reinforcing plate 32 is welded on the basis of the secondary release connection structure to further increase the force-bearing area of ​​the rivet screw 31 and the chassis and increase the tensile strength. The screw and the reinforcing plate 32 are connected by argon arc welding, which is easy to process and reliable. The reliability of the connection of the door panel 2 in the reinforced area is guaranteed.

[0055] Since the door panel 2 is a four-sided bent shape with high strength and rigidity, in order to ensure that the door panel 2 can be deformed quickly in a very short time and release the pressure generated by the explosion, a notch 23 is added to the door panel 2 to reduce the strength and rigidity of the door panel 2, so that the door panel 2 can be deformed smoothly and quickly to release pressure, thereby reducing the impact of the explosion. In addition, the width and length of the notch 23 are designed in detail to ensure that the door panel 2 can be deformed quickly to release pressure, while maintaining the rigidity and strength of the door panel to meet the sealing performance of the inverter.

[0056] Example 2

[0057] A power generation system of the present embodiment includes a solar cell array, a control cabinet, a transformer and the explosion-proof photovoltaic inverter in Example 1, the solar cell array is electrically connected to the explosion-proof photovoltaic inverter, which is used to convert solar energy into electrical energy and output direct current; the explosion-proof photovoltaic inverter is electrically connected to the transformer, which is used to process the direct current and output alternating current; the transformer is electrically connected to the power grid, which is used to increase the voltage of the alternating current and input it into the power grid; the control cabinet is electrically connected to the solar cell array, the transformer and the explosion-proof photovoltaic inverter, which is used to distribute and protect the power generation system.

[0058] That is, the power generation system and explosion-proof photovoltaic inverter of this embodiment are applied in the field of photovoltaic new energy. It is a power generation system that uses the photovoltaic effect of photovoltaic cells to directly convert solar radiation energy into electrical energy. In addition to photovoltaic inverters, this field also includes solar cell arrays, control cabinets and transformers. The solar cell array (photovoltaic panel) converts solar energy into electrical energy and outputs direct current (to the inverter); the inverter rectifies, inverts and boosts the direct current output by the photovoltaic panel to output alternating current of about 1200V; the control cabinet distributes and protects the entire power system; the transformer increases the system voltage and inputs it into the power grid.

[0059] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. An explosion-proof photovoltaic inverter, characterized in that: It comprises a box body (1), a door panel (2) and a fixing member (3). The door panel (2) is installed at the opening of the box body (1) and is connected to the edge of the opening of the box body (1) via a fixing member (3). There are a plurality of fixing members (3), each fixing member (3) is distributed along the edge of the opening of the box body (1), and the connection strength of each fixing member (3) in a first set area (21) on the door panel (2) is smaller than the connection strength of each fixing member (3) in a second set area (22) on the door panel (2). After the door panel (2) is impacted by an explosion in the box (1), the fixing member (3) in the first set area (21) releases the constraint between the door panel (2) and the box (1), and partially opens the opening of the box (1) corresponding to the first set area (21), so that the interior of the box (1) is connected to the external environment.

2. The explosion-proof photovoltaic inverter according to claim 1, characterized in that: The box body (1) opening and the door panel (2) are both rectangular in structure. The first set area (21) is a fan-shaped area including a corner of the door panel (2), and the second set area (22) is the remaining area on the door panel (2) except the first set area (21).

3. The explosion-proof photovoltaic inverter according to claim 2, characterized in that: In the first set area (21), the connection strength of a plurality of fixing members (3) close to a corner of the door panel (2) is lower than the connection strength of the remaining fixing members (3) in the first set area (21), and the first set area (21) is divided into a primary release area and a secondary release area according to the connection strength of the fixing members (3) from weak to strong. After the door panel (2) is impacted by an explosion in the box (1), the fixing member (3) in the first set area (21) gradually releases the constraint between the door panel (2) and the box (1) according to the connection strength, so that the opening of the box (1) corresponding to the primary release area and the secondary release area gradually opens.

4. The explosion-proof photovoltaic inverter according to any one of claims 1 to 3, characterized in that: The fixing member (3) comprises a self-clinching screw (31), the self-clinching screw (31) passing through the opening edge of the box body (1) from the side of the box body (1) away from the door panel (2) to the side close to the door panel (2), and connected to the door panel (2) through a threaded portion, so that the head of the self-clinching screw (31) contacts and clamps the box body (1). Each of the fixing members (3) is configured to achieve connection strength by setting the size of the contact area between the head of the rivet screw (31) and the opening edge of the box body (1).

5. The explosion-proof photovoltaic inverter according to claim 4, characterized in that: Each fixing member (3) in the first set area (21) directly contacts and clamps the box body (1) via the head of the rivet screw (31); Each fixing member (3) in the second set area (22) further comprises a reinforcing plate (32), wherein the reinforcing plate (32) is attached to a surface of the box body (1) on a side away from the door panel (2). In each fixing member (3) within the second set area (22), the head of the self-clinching screw (31) is welded to the reinforcing plate (32) to increase the equivalent contact area between the head of the self-clinching screw (31) and the box body (1).

6. The explosion-proof photovoltaic inverter according to claim 4, characterized in that: The fixing member (3) further comprises a supporting member (33) and a fixing screw (34). The support member (33) is arranged between the door panel (2) and the opening edge of the box body (1). The threaded portion of the self-clinching screw (31) is connected to the support member (33). The fixing screw (34) passes through the door panel (2) from the side of the door panel (2) away from the box body (1) to the side close to the box body (1), and is connected to the support member (33) through the threaded portion so that the head of the fixing screw (34) contacts and clamps the door panel (2).

7. The explosion-proof photovoltaic inverter according to claim 6, characterized in that: The fixing member (3) further comprises a gasket (35), wherein the gasket (35) is arranged between the head of the fixing screw (34) and the door panel (2) to prevent the head of the fixing screw (34) from falling out of the door panel (2) after the door panel (2) is impacted by an explosion in the box body (1).

8. The explosion-proof photovoltaic inverter according to claim 7, characterized in that: The door panel (2) is provided with a through hole at the location where the fixing screw (34) is provided, and the through hole is a countersunk hole that is circumferentially recessed toward one side of the box body (1). The gasket (35) comprises a convex gasket (351) and a flat gasket (352). The convex washer (351) has a sinking area corresponding to the countersunk hole structure in the middle, and the convex washer (351) is clamped in the countersunk hole. The flat gasket (352) is arranged in the sinking area of ​​the convex gasket (351), and is arranged between the head of the fixing screw (34) and the convex gasket (351).

9. The explosion-proof photovoltaic inverter according to claim 1, characterized in that: The edge of the door panel (2) is provided with a folded edge bent toward the side of the box body (1), so that the door panel (2) is in a box shape that is covered outside the opening edge of the box body (1).

10. The explosion-proof photovoltaic inverter according to any one of claims 1 to 3 and 9, characterized in that: A notch (23) is provided at the intersection of the critical line between the regions on the door panel (2) and the edge of the door panel (2).

11. A power generation system, characterized in that: It comprises a solar cell array, a control cabinet, a transformer and an explosion-proof photovoltaic inverter as claimed in any one of claims 1 to 10. The solar cell array is electrically connected to the explosion-proof photovoltaic inverter to convert solar energy into electrical energy and output direct current; The explosion-proof photovoltaic inverter is electrically connected to a transformer, which is used to process direct current and then output alternating current; The transformer is electrically connected to the power grid and is used to increase the voltage of the AC power and then input it into the power grid; The control cabinet is electrically connected to the solar cell array, the transformer and the explosion-proof photovoltaic inverter, and is used for distributing and protecting the power generation system.

Images