A photovoltaic inverter

Abstract

The application discloses a photovoltaic inverter, which comprises a box body, a cover body and an electrolytic capacitor. The photovoltaic inverter further comprises an explosion-proof pressure relief device, which comprises an explosion-proof cover. At least part of the explosion-proof cover is located between the cover body and the electrolytic capacitor. The box body comprises a main body and a pressure relief part. A first end of the explosion-proof cover is rotatably connected to the main body, and a second end of the explosion-proof cover is fixedly connected to the pressure relief part. At least part of the edge of the pressure relief part is connected to the main body through a tear part with reduced thickness. When the explosion-proof cover is pushed by the explosion force of the electrolytic capacitor and is turned around the pivot, the tear part is torn, the pressure relief part is bent inward or separated from the main body, so that a pressure relief opening, which is connected to the outside atmosphere, is formed between the pressure relief part and the main body. The pressure relief device further comprises a filter screen and a driving mechanism. The filter screen has an initial position and a working position. The driving mechanism comprises an elastic member, and the elastic member is connected to the filter screen. The photovoltaic inverter disclosed by the application reduces the risk of splashing electrolyte to hurt people and the pollution to the environment.

Description

TECHNICAL FIELD

[0001] The present application relates to a photovoltaic inverter. BACKGROUND

[0002] The photovoltaic inverter is a power conversion device that can convert the direct current generated by the photovoltaic solar panel into alternating current. The photovoltaic inverter is usually installed on the wall of a house or a bracket. Considering the humid environment such as rain and snow outdoors, the photovoltaic inverter has a high protection grade and air tightness to prevent dust, rain and other factors from damaging the electronic devices inside the inverter. However, after excessive use, the photovoltaic inverter may have a problem of capacitor short circuit, which may cause the electrolytic capacitor to explode and generate a large amount of irritating gas and corrosive electrolyte. Since the photovoltaic inverter is a sealed structure, high pressure may be generated inside the inverter, which may easily cause damage to the structure of the inverter, and in severe cases, the upper cover may even be blown off, the electrolyte may flow out, and safety hazards may be caused.

[0003] At present, there is an explosion-proof box, which mainly opens a pressure relief port on the inverter box body, and then covers the pressure relief port with a movable cover plate. When the electronic components or devices in the box body explode, the movable cover plate can be switched from the closed state to the pressure relief state under the impact force of the explosion, so as to expose the pressure relief port, so that the impact force generated by the explosion can be released from the pressure relief port. This explosion-proof box needs to pre-drill a hole (i.e. the pressure relief port) on the inverter box body, which will damage the structure of the box body in advance and adversely affect the strength and sealing performance of the box body; the explosion may cause the corrosive electrolyte of the electrolytic capacitor to splash or produce small explosion fragments, and these splashed droplets or explosion fragments may splash out of the pressure relief port to the outside, so the electrolyte may directly splash out of the box body or the small explosion fragments may fly out of the box body, which may cause a risk of splashing injury to people and may also pollute the environment, thus having a large safety hazard. SUMMARY

[0004] In view of at least one of the above technical problems, the present application provides an improved photovoltaic inverter.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] A photovoltaic inverter, comprising a box body with one end open, a cover body connected to the box body to close the opening, and an electrolytic capacitor arranged in the box body, the photovoltaic inverter further comprising an explosion-proof pressure relief device, the explosion-proof pressure relief device comprising an explosion-proof cover, the explosion-proof cover housing the electrolytic capacitor therein, at least part of the explosion-proof cover being located between the cover body and the electrolytic capacitor to avoid the electrolytic capacitor from splashing or liquid impacting the cover body after explosion.

[0007] The box comprises a body and a pressure relief part, the explosion-proof cover has different first and second end parts, the first end part is rotatably connected to the body, and the second end part is fixedly connected to the pressure relief part; at least one edge of the pressure relief part is connected to the body through a thickness-reduced tear part, when the explosion-proof cover is flipped around the pivot by the explosion force of the electrolytic capacitor, the tear part is torn, the pressure relief part is bent inward or separated from the body to form a pressure relief opening communicating with the outside atmosphere between the pressure relief part and the body;

[0008] The pressure relief device further comprises a filter screen arranged in the box and a driving mechanism for driving the filter screen to move towards the pressure relief opening, the filter screen has an initial position deviating from the pressure relief part and a working position covering the pressure relief opening, and the driving mechanism comprises an elastic member capable of being elastically reset when the explosion-proof cover is flipped.

[0009] Preferably, the thickness of the tear part is less than half of the thickness of the body or the pressure relief part.

[0010] More preferably, the thickness of the tear part is greater than one third of the thickness of the body or the pressure relief part. When the electrolytic capacitor explodes, the tear part is easily torn.

[0011] Preferably, the side of the pressure relief part closer to the cover body is integrally arranged with the body, the other edges of the pressure relief part are connected to the body through the tear part, and the outer surface of the tear part is flush with the outer surface of the pressure relief part.

[0012] Preferably, the tear part is formed by opening a U-shaped or half-frame-shaped groove on the inner wall of the box.

[0013] More preferably, a groove is formed between the body, the pressure relief part and the tear part, the driving mechanism further comprises a limiting catch, the limiting catch is clamped in the groove when the filter screen is in the initial position, and the limiting catch is disengaged from the groove to release the filter screen after the pressure relief part is bent inward.

[0014] Preferably, the driving mechanism further comprises a straight guide for guiding and limiting the filter screen, and the straight guide is fixedly arranged with the body or integrally formed.

[0015] Preferably, the straight guide is two and is arranged at intervals, a straightly extending guide groove is arranged on each straight guide, and the side edge of the filter screen is slidably inserted into the guide groove.

[0016] More preferably, the first end portion is rotatably connected to the body by a hinge, the hinge comprising a base and a hinge head, the hinge head having two opposite ends, the hinge head being pivotally connected to the base by a pivot shaft, the pivot shaft being located between the two ends of the hinge head, one end of the hinge head being fixedly connected to the first end portion of the explosion-proof cover, the other end being provided with a limiting block capable of abutting against the base, the explosion-proof cover being turned to its maximum angle when the limiting block abuts against the base, so as to prevent the explosion-proof cover from hitting the cover body.

[0017] Specifically, the maximum angle of the explosion-proof cover is 15°.

[0018] Preferably, the electrolytic capacitor is arranged on a PCB, the PCB being fixedly arranged on the bottom of the box body, the cover body being connected to the top of the box body, the first end portion of the explosion-proof cover being rotatably connected to the left side of the box body, the pressure relief portion being located on the right side wall of the box body, the explosion-proof cover covering the electrolytic capacitor and enclosing the electrolytic capacitor between the explosion-proof cover and the PCB, the lower edge and the front and back edges of the pressure relief portion being connected to the body through a tear portion with reduced thickness, the pressure relief portion being bent inward and upward after the tear portion is torn; the filter screen is located below the pressure relief portion in the initial position.

[0019] The present application has the following advantages compared with the prior art by adopting the above scheme:

[0020] When the electrolytic capacitor in the inverter box body explodes, the explosion generates an impact force to turn the explosion-proof cover. Since the thickness of the tear portion is thin, the turning of the explosion-proof cover connected to the tear portion will tear the tear portion, and the pressure relief portion will be bent inward and deformed to form a pressure relief opening between the pressure relief portion and the body. At the same time, the elastic member is automatically reset and pushes the filter screen to cover the pressure relief opening. At this time, the filter screen can filter out the electrolyte or small explosion fragments mixed in the gas, reduce the risk of electrolyte splashing and environmental pollution, and improve safety. On the premise of avoiding direct impact of the electrolytic capacitor explosion on the cover body and ensuring personal safety, the main structure of the box body does not need to be damaged in advance, and the sealing performance of the photovoltaic inverter is not adversely affected. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0022] Figure 1 is a schematic view of the photovoltaic inverter according to the present application;

[0023] Figure 2 This is a partial schematic diagram of the photovoltaic inverter according to the present invention;

[0024] Figure 3 A 3D view of the hinge;

[0025] Figure 4 This is a 3D view of the explosion-proof cover;

[0026] Figure 5 This is a partial schematic diagram of an explosion-proof pressure relief device.

[0027] in,

[0028] 100. Enclosure; 101. Right side wall; 102. Groove; 103. Electrolytic capacitor; 104. Pressure relief section; 105. Body; 106. Nut;

[0029] 1. Explosion-proof pressure relief device; 11. Reinforcing rib; 12. Upward flange; 13. Explosion-proof cover; 131. First end; 132. Second end; 14. Filter screen; 15. U-shaped groove; 16. Mounting hole;

[0030] 2. Hinge; 21. Base; 22. Hinge head; 23. Rotary pivot; 24. Limiting block;

[0031] 3. Drive mechanism; 31. Elastic element; 32. Limiting hook; 34. Linear guide element; 341. Guide groove; 35. Mounting plate. Detailed Implementation

[0032] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art. It should be noted that the description of these embodiments is for the purpose of aiding understanding the present invention, but does not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] It should be noted that the directional terms such as "up," "down," "front," "back," "left," and "right" used in this article can be found in the appendix. Figure 1 The top, bottom, left, and right sides of the paper.

[0034] Reference Figures 1 to 5 As shown, this embodiment provides a photovoltaic inverter, including a housing 100 with one open end, a cover (not shown) connected to the housing 100 to close the open end, an electrolytic capacitor 103 disposed inside the housing 100, and an explosion-proof pressure relief device 1. The electrolytic capacitor 103 is disposed on a PCB board, and the PCB board is fixedly disposed at the bottom of the housing 100.

[0035] Further, the explosion-proof pressure relief device 1 comprises an explosion-proof cover 13 and a filter screen 14, the explosion-proof cover 13 covers the electrolytic capacitor 103 and encloses the electrolytic capacitor 103 between the explosion-proof cover 13 and the PCB board, at least part of the explosion-proof cover 13 is located between the cover body and the electrolytic capacitor 103 to avoid the fragments or liquid of the exploded electrolytic capacitor 103 impacting the cover body which is closed by the opening.

[0036] In combination with Figure 1 and Figure 4 As shown in the figures, the box body 100 comprises a main body 105 and a pressure relief part 104, the explosion-proof cover 13 has a first end 131 and a second end 132, the first end 131 and the second end 132 are provided with reinforcing ribs 11 and upturned edges 12 to increase the structural strength. The first end 131 is rotatably connected to the main body 105, and the second end 132 is fixedly connected to the pressure relief part 104. Specifically, the first end 131 of the explosion-proof cover 13 is rotatably connected to the left side of the box body 100, and the pressure relief part 104 is located on the right side wall 101 of the box body. Further, the second end 132 is provided with two upward-opening U-shaped grooves 15, the design of the U-shaped grooves 15 makes it more convenient to lock the second end 132 and the pressure relief part 104.

[0037] Further, in combination with Figure 1 and Figure 3 As shown in the figures, the first end 131 of the explosion-proof cover 13 is rotatably connected to the main body 105 by a hinge 2. The hinge 2 comprises a base 21 and a hinge head 22, the hinge head 22 has two opposite ends, the hinge head 22 is pivoted to the base 21 by a pivot shaft 23, and the pivot shaft 23 is located between the two ends of the hinge head 22. One end of the hinge head 22 is fixedly connected to the first end 121 of the explosion-proof cover 13, specifically, a plurality of connecting holes 16 are provided on one end of the hinge head 22 and the first end 121 of the explosion-proof cover 13, and they are fixed together by nut locking. The other end of the hinge head 22 is provided with a limiting block 24 which can abut against the base 21, when the limiting block 24 abuts against the base 21, the explosion-proof cover 13 is turned to its maximum angle to prevent the explosion-proof cover 13 from impacting the cover body. Specifically, the limiting block 24 can limit the maximum angle of the explosion-proof cover 13 to 15°.

[0038] The tearable part is formed by a U-shaped or half-frame-shaped groove 102 formed on the right inner wall of the box 100, and the groove 102 is formed between the body 105, the pressure relief part 104 and the tearable part. The thickness of the tearable part is less than half of the thickness of the body 105 or the pressure relief part 104, and greater than one third of the thickness of the body 105 or the pressure relief part 104. When the electrolytic capacitor 103 explodes, the explosion force of the electrolytic capacitor 103 pushes the explosion-proof cover 13 to flip around the pivot 23, and the strong impact force is directed to the tearable part, the tearable part is torn, and the pressure relief part 104 is bent inward or separated from the body to form a pressure relief opening communicating with the external atmosphere between the pressure relief part 104 and the body 105, thereby avoiding explosion caused by high internal pressure.

[0039] At least one edge of the pressure relief part 104 is connected to the body 105 through the tearable part with reduced thickness. Specifically, the side of the pressure relief part 104 closer to the cover is integrally provided with the body 105, and the other edges of the pressure relief part 104 are connected to the body 105 through the tearable part, and the outer surface of the tearable part is flush with the outer surface of the pressure relief part 104. More specifically, the lower edge and the front and rear edges of the pressure relief part 104 are connected to the body 105 through the tearable part with reduced thickness, and after the tearable part is torn, the pressure relief part 104 is bent inward and upward to form a pressure relief opening between the pressure relief part 104 and the body 105.

[0040] The filter screen 14 is arranged in the box 100, and the pressure relief device 1 further comprises a driving mechanism 3 for driving the filter screen 14 to move towards the pressure relief opening.

[0041] Referring to Figure 5 As shown, the driving mechanism 3 comprises an elastic member 31, a limiting hook 32, a linear guide 34 and a mounting plate 35 arranged below the elastic member 31, and the mounting plate 35 is locked on the bottom of the box 100. The elastic member 31 can be elastically reset when the explosion-proof cover 13 flips, and the elastic member 31 is connected to the filter screen 14.

[0042] The filter screen 14 has an initial position and a working position. In the initial position, the elastic member 31 is in a compressed state, the filter screen 14 is located below the pressure relief part 104, and the limiting hook 32 is clamped in the groove 102; in the working position, the elastic force of the elastic member 31 causes the filter screen 14 to cover the pressure relief opening and filter out a large amount of electrolyte mixed in the gas, thereby reducing the risk of electrolyte splashing and the pollution to the environment. When the initial position changes to the working position, the limiting hook 32 is released from the groove 102 to release the filter screen 14 after the pressure relief part 104 is bent inward.

[0043] Further, the number of the linear guides 34 is two and is arranged at intervals and is located at the left and right sides of the filter screen 14, and the linear guides 34 are used for guiding and limiting the filter screen 14. The linear guides 34 and the body 105 are fixedly arranged or integrally formed, and specifically to the embodiment, the linear guides 34 and the body 105 are fixedly connected. Each linear guide 34 is provided with a linearly extending guide groove 341, and the side edge of the filter screen 14 is slidably inserted in the guide groove 341.

[0044] The working principle of the photovoltaic inverter of the embodiment is as follows:

[0045] When the electrolytic capacitor 103 explodes due to short circuit, the impact force generated by the explosion directly acts on the explosion-proof cover 13, pushes the explosion-proof cover 13 to rotate around the rotating shaft 23 of the hinge 2 as the axis, the impact force makes the tearing part tear, and the pressure relief part 104 bends inward and upward, forming a pressure relief opening connected to the external atmosphere between the pressure relief part 104 and the body 105. When the rotating angle reaches 15°, the limiting block 4 will abut against the first end part 131 of the explosion-proof cover 13, so that the explosion-proof cover 13 stops rotating, to prevent the explosion-proof cover 13 from impacting the cover body, and to avoid that the torn window on the box body 100 is too large;

[0046] When the tearing part tears and the pressure relief opening is formed on the box body 100, the limiting clamping hook 32 clamped in the groove 102 is separated from the groove 102 to release the filter screen 14, and the filter screen 14 is quickly pushed upward by the elastic member 31 and covers the pressure relief opening, filtering a large amount of electrolyte mixed in the gas.

[0047] The photovoltaic inverter has at least the following advantages:

[0048] (1) The photovoltaic inverter of the embodiment can form a pressure relief opening on the inverter box body after the driving mechanism 3 is arranged, and the filter screen 14 is quickly pushed upward by the elastic member 31 to completely block the pressure relief opening, while filtering a large amount of electrolyte mixed in the gas, thereby reducing the risk of electrolyte splashing and the pollution to the environment.

[0049] (2) The photovoltaic inverter of the embodiment does not need to pre-drill holes on the side wall and arrange movable cover plates at the holes, thereby avoiding affecting the sealing performance of the box body of the photovoltaic inverter and reducing the cost; by arranging the explosion-proof cover 13 between the electrolytic capacitor 103 and the cover body, the direct impact of the electrolytic capacitor 103 explosion on the box body 100 and the upper cover is avoided, the structural damage of the photovoltaic inverter is reduced, and the personal safety is ensured;

[0050] (3) When the electrolytic capacitor 103 explodes, the photovoltaic inverter of the embodiment can rotate the explosion-proof cover 13 by the hinge 2 with the rotating shaft 23 as the axis by a certain angle, tear the tearable part, bend the pressure relief part 104 inward and upward, and form a window for rapid pressure relief between the pressure relief part 104 and the body 105, thereby avoiding the explosion caused by the high internal pressure.

[0051] As shown in the specification and claims, the term "comprising" only indicates that the steps and elements explicitly identified are included, and these steps and elements do not constitute an exclusive list, and the method or device can also include other steps or elements. The term "and / or" used herein includes any combination of one or more related listed items.

[0052] It should be noted that, unless otherwise specified, when a certain feature is referred to as "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or indirectly fixed or connected to the other feature. In addition, the up, down, left, right and other descriptions used in the present application are only relative to the relative positions of the components of the present application in the drawings.

[0053] The above embodiments are only to illustrate the technical concept and characteristics of the present application, and are a preferred embodiment, the purpose of which is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent transformation or modification made according to the principle of the present application should be covered within the protection scope of the present application.

Claims

1. A photovoltaic inverter, comprising a housing with an open end, a cover connected to the housing to close the open end, and an electrolytic capacitor disposed within the housing, characterized in that, The photovoltaic inverter also includes an explosion-proof pressure relief device, which includes an explosion-proof cover. The explosion-proof cover houses the electrolytic capacitor, and at least a portion of the explosion-proof cover is located between the cover and the electrolytic capacitor to prevent fragments or liquid from impacting the cover after the electrolytic capacitor explodes. The enclosure includes a main body and a pressure relief section. The explosion-proof cover has a first end and a second end that are different from each other. The first end is rotatably connected to the main body, and the second end is fixedly connected to the pressure relief section. At least a portion of the edge of the pressure relief section is connected to the main body through a tear with reduced thickness. When the explosion-proof cover is pushed to rotate around a pivot by the explosive force of the electrolytic capacitor, the tear is torn, and the pressure relief section bends inward or detaches from the main body, thereby forming a pressure relief port communicating with the external atmosphere between the pressure relief section and the main body. The pressure relief device further includes a filter screen disposed in the housing and a drive mechanism for driving the filter screen to move toward the pressure relief port. The filter screen has an initial position offset from the pressure relief part and a working position covering the pressure relief port. The drive mechanism includes an elastic element that can elastically reset when the explosion-proof cover is flipped. The elastic element is connected to the filter screen.

2. The photovoltaic inverter according to claim 1, characterized in that, The thickness of the tear is less than half the thickness of the body or the pressure relief part.

3. The photovoltaic inverter according to claim 2, characterized in that, The thickness of the tear is greater than one-third of the thickness of the body or the pressure relief part.

4. The photovoltaic inverter according to claim 1, characterized in that, The pressure relief part is integrally formed with the main body on the side closer to the cover. The other edges of the pressure relief part are connected to the main body through the tear part, and the outer surface of the tear part is flush with the outer surface of the pressure relief part.

5. The photovoltaic inverter according to claim 4, characterized in that, The tear is formed by creating a U-shaped or semi-frame-shaped groove on the inner wall of the housing.

6. The photovoltaic inverter according to claim 1, characterized in that, A groove is formed between the body, the pressure relief part and the tearing part. The driving mechanism also includes a limiting hook. When the filter screen is in the initial position, the limiting hook is locked in the groove. After the pressure relief part bends inward, the limiting hook disengages from the groove to release the filter screen.

7. The photovoltaic inverter according to claim 1, characterized in that, The drive mechanism also includes a linear guide for guiding and limiting the filter screen, and the linear guide is fixedly disposed or integrally formed with the body.

8. The photovoltaic inverter according to claim 7, characterized in that, The linear guide is provided in two spaced apart, and each linear guide is provided with a linearly extending guide groove, and the side of the filter screen is slidably inserted into the guide groove.

9. The photovoltaic inverter according to claim 1, characterized in that, The first end is rotatably connected to the body via a hinge, the hinge including a base and a hinge head, the hinge head having two opposite ends, the hinge head being pivotally connected to the base via a pivot located between the two ends of the hinge head, one end of the hinge head being fixedly connected to the first end of the explosion-proof cover, and the other end being provided with a limiting block that can abut against the base, when the limiting block abuts against the base, the explosion-proof cover flips to its maximum angle to prevent the explosion-proof cover from impacting the cover.

10. The photovoltaic inverter according to claim 1, characterized in that, The electrolytic capacitor is mounted on a PCB board, which is fixedly mounted at the bottom of the enclosure. The cover is connected to the top of the enclosure. The first end of the explosion-proof cover is rotatably connected to the left side of the enclosure. The pressure relief section is located on the right side wall of the enclosure. The explosion-proof cover covers the electrolytic capacitor and seals it between the explosion-proof cover and the PCB board. The lower edge and front and rear edges of the pressure relief section are connected to the main body through a tear with reduced thickness. After the tear is torn, the pressure relief section bends inward and upward. The filter screen is located below the pressure relief section in its initial position.

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