Explosion-proof structure and inverter

Abstract

The utility model discloses a kind of explosion-proof structure and inverter, it is related to photovoltaic equipment technical field, explosion-proof structure includes fixed screw sleeve being arranged between box and upper cover and back lock bolt being arranged in box, fixed screw sleeve is equipped with locating post, locating post is cooperated with the locating hole of upper cover, fixed screw sleeve is threadedly connected with back lock bolt;Fixed screw sleeve is equipped with welding portion away from the end of back lock bolt, welding portion is connected by welding with upper cover.In the utility model, on the basis of retaining original bolt connection mode between fixed screw sleeve and back lock bolt, further change the connecting mode of fixed screw sleeve and upper cover from riveting to welding, enhance the mechanical strength of back lock bolt and upper cover combination part, and improve the tensile strength of combination part by welding connection, to greatly improve the reliability of connection, enhance explosion-proof performance, reduce the risk of upper cover flying off in operation process, to further improve the reliability of inverter.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic equipment technology, and in particular to an explosion-proof structure and inverter. Background Technology

[0002] As the core equipment of a photovoltaic power generation system, the performance and reliability of the inverter directly affect the power generation efficiency and operational safety of the entire system. In recent years, with the rapid development of the photovoltaic industry, higher requirements have been placed on inverters in terms of power density, integration, and economy. Correspondingly, their size, weight, and cost are also facing increasingly stringent constraints. Against this backdrop, optimizing the mechanical structure of inverters and improving their reliability and production efficiency is particularly necessary.

[0003] To achieve a compact overall product structure, the inverter's casing and top cover are typically connected using a press-fitting process. (See attached image) Figure 1 and 3 As shown, a bottom hole is made in the top cover, and then a press-fit stud 01 is embedded into the bottom hole using specialized equipment. High pressure is applied to cause extrusion plastic deformation, thereby fixing it to the housing. However, this process has many drawbacks. For example, the large opening design required for press-fitting, and the severe plastic deformation generated during the pressing process, can easily lead to stress concentration in the press-fitting area of ​​the top cover, reducing the fatigue strength of the material. Especially under long-term dynamic loads or extreme operating conditions, there is a risk of loosening or even failure of the connection, which weakens the connection stiffness of the overall structure and thus affects the reliability of the inverter. Utility Model Content

[0004] The purpose of this utility model is to provide an explosion-proof structure and inverter, which changes the connection method between the fixing screw sleeve and the top cover from riveting to welding, thereby improving the connection strength between the housing and the top cover, effectively improving the reliability of the inverter, and solving the technical problem of low reliability caused by riveting connection in existing inverters.

[0005] To achieve the above objectives, this utility model provides an explosion-proof structure, including a fixing screw sleeve disposed between the housing and the top cover and a back locking bolt disposed on the housing. The fixing screw sleeve is provided with a positioning post, which cooperates with the positioning hole provided on the top cover. The fixing screw sleeve is threadedly connected to the back locking bolt. The end of the fixing screw sleeve away from the back locking bolt is provided with a welding part, which is welded to the top cover.

[0006] In some embodiments, the welded portion is a transition surface located at the end of the fixing sleeve away from the back locking bolt; along the axial direction of the fixing sleeve, the diameter of the transition surface gradually decreases in the direction close to the positioning post; an annular weld is formed between the transition surface and the top cover.

[0007] In some embodiments, the transition surface is an arc surface or a conical surface.

[0008] In some embodiments, the welded portion is a flange ring located at the end of the fixing sleeve away from the back locking bolt, and the diameter of the flange ring is larger than the diameter of the fixing sleeve; a weld gap is formed between the flange ring and the top cover.

[0009] In some embodiments, the fixing sleeve includes a main body portion, which is coaxially disposed with the positioning post, and the diameter of the main body portion is larger than the diameter of the positioning post.

[0010] In some embodiments, the length of the positioning post along the axial direction of the main body is equal to the wall thickness of the upper cover.

[0011] In some embodiments, a protrusion is formed at the end of the main body away from the positioning post, and the diameter of the protrusion is smaller than the diameter of the main body; the end of the protrusion away from the main body abuts against the inner sidewall of the housing.

[0012] In some embodiments, an abutment surface is formed at the end of the main body away from the protrusion, and the abutment surface abuts against the inner sidewall of the top cover.

[0013] In some embodiments, the fixed screw sleeve has a threaded groove at the end away from the positioning post, and the threaded groove is threaded with the screw of the back locking bolt; along the axial direction of the main body, the threaded groove extends from the end face of the protrusion into the main body; the depth of the threaded groove is less than the length of the fixed screw sleeve.

[0014] This utility model also provides an inverter, including the above-mentioned explosion-proof structure.

[0015] Compared to the prior art, the explosion-proof structure of this utility model includes a back-locking bolt and a fixing screw sleeve. The fixing screw sleeve is located between the housing and the top cover, and the back-locking bolt is located in the housing. The fixing screw sleeve has a positioning post, which mates with the positioning hole provided in the top cover. The fixing screw sleeve is threadedly connected to the back-locking bolt. The end of the fixing screw sleeve away from the back-locking bolt has a welding part, which is welded to the top cover, so that the housing and the top cover are reliably connected.

[0016] In this utility model, while retaining the original bolt connection method, the connection method between the fixing screw sleeve and the back locking bolt is further changed from riveting to welding. This enhances the mechanical strength of the joint between the back locking bolt and the top cover, and improves the tensile strength of the joint through welding. This significantly improves the connection reliability, enhances the explosion-proof performance, reduces the risk of the top cover flying off during operation, and thus improves the reliability of the inverter. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of an existing explosion-proof structure;

[0019] Figure 2 for Figure 1 A magnified view of part A in the image;

[0020] Figure 3 for Figure 2 Schematic diagram of medium-pressure rivet bolt;

[0021] Figure 4 A schematic diagram of the explosion-proof structure installed between the box body and the top cover, provided in an embodiment of this utility model;

[0022] Figure 5 for Figure 4 Another schematic diagram;

[0023] Figure 6 for Figure 4 The main view;

[0024] Figure 7 for Figure 6 Sectional view along the BB direction;

[0025] Figure 8 for Figure 7 A magnified view of part C;

[0026] Figure 9 for Figure 8 Schematic diagram of the fixed threaded sleeve;

[0027] Figure 10 for Figure 9 The main view;

[0028] Figure 11 for Figure 10 Top view;

[0029] Figure 12 for Figure 8 A schematic diagram of another fixing screw sleeve;

[0030] Figure 13 for Figure 8 A schematic diagram of another fixing screw sleeve;

[0031] Figure 14 for Figure 13 The main view;

[0032] Figure 15 for Figure 14 A bottom view.

[0033] The attached figures are labeled as follows:

[0034] Press-fit stud 01;

[0035] 1. Box body; 2. Top cover; 3. Fixing screw sleeve; 4. Back lock bolt;

[0036] Positioning post 31, welding part 32, main body part 33, protrusion 34, abutment surface 35 and threaded groove 36;

[0037] Transition surface 321 and flange ring 322. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] This utility model discloses an explosion-proof structure, as shown in the attached figure. Figures 4 to 8 As shown, it connects the housing 1 and the top cover 2. The explosion-proof structure includes a fixing screw sleeve 3 and a back-locking bolt 4. The fixing screw sleeve 3 is located between the housing 1 and the top cover 2, serving as a rigid connection node between the housing 1 and the top cover 2. It effectively suppresses the deformation of the housing 1 under stress or vibration conditions, making the entire structure more stable and reliable. The fixing screw sleeve 3 is equipped with a positioning post 31, which cooperates with the positioning hole provided in the top cover 2. This not only enables precise alignment during installation, preventing misalignment of the threads between the fixing screw sleeve 3 and the back-locking bolt 4, effectively improving assembly accuracy and operational efficiency, but also, through the tight cooperation between the positioning post 31 and the positioning hole, effectively suppresses the relative movement between the top cover 2 and the fixing screw sleeve 3 in the radial plane, improving connection stability.

[0041] As attached Figure 8 As shown, the fixing screw sleeve 3 is threadedly connected to the back locking bolt 4. The end of the fixing screw sleeve 3 away from the back locking bolt 4 is provided with a welding part 32. The welding part 32 is welded to the upper cover 2, so that the box body 1 and the upper cover 2 can be reliably connected.

[0042] In this utility model, while retaining the original bolt connection method, the connection method between the fixing screw sleeve 3 and the back locking bolt 4 is further changed from riveting to welding. This enhances the mechanical strength of the joint between the back locking bolt 4 and the top cover 2, and improves the tensile strength of the joint through welding. This significantly improves the connection reliability, enhances the explosion-proof performance, reduces the risk of the top cover 2 flying off during operation, and thus improves the reliability of the inverter.

[0043] As a preferred embodiment, as shown in the appendix Figures 9 to 12 As shown, the welding part 32 is a transition surface 321 located at the end of the fixing screw sleeve 3 away from the back locking bolt 4; along the axial direction of the fixing screw sleeve 3, the diameter of the transition surface 321 gradually decreases in the direction close to the positioning post 31, so that an annular weld is formed between the transition surface 321 and the upper cover 2, which is used to fill the weld, increase the metallurgical bonding area between the fixing screw sleeve 3 and the upper cover 2, and effectively improve the connection strength between the fixing screw sleeve 3 and the upper cover 2.

[0044] Preferably, the transition surface 321 is an arc surface or a conical surface, which increases the filling area of ​​the solder by reducing the amount of material, thereby improving the connection strength.

[0045] As another preferred embodiment, see attached Figures 13 to 15 As shown, the welding part 32 is a flange ring 322 located at the end of the fixing sleeve 3 away from the back-locking bolt 4. The diameter of the flange ring 322 is larger than the diameter of the fixing sleeve 3, forming a radially extended structure. A welding gap is formed between the flange ring 322 and the upper cover 2 to fill the gap with solder. The flange ring 322 also increases the contact area between the fixing sleeve 3 and the upper cover 2, resulting in a larger weld volume after welding and improving the connection strength between the fixing sleeve 3 and the upper cover 2.

[0046] In a preferred embodiment, the fixing screw sleeve 3 includes a main body 33, which is coaxially arranged with the positioning post 31. That is, the main body 33 and the positioning post 31 of the fixing screw sleeve 3 are designed as a coaxial integrated unit. The diameter of the main body 33 is larger than the diameter of the positioning post 31. The larger diameter of the main body 33 increases the contact area between the main body 33 and the upper cover 2, so that the preload of the back locking bolt 4 and the external load can be distributed to the upper cover 2 through a larger bearing area, reducing the pressure per unit area and preventing the upper cover 2 from undergoing plastic deformation under local pressure.

[0047] In a preferred embodiment, the length of the positioning post 31 along the axial direction of the main body 33 is equal to the wall thickness of the upper cover 2. When the positioning post 31 is inserted into the positioning hole of the upper cover 2, it not only ensures that the end face of the main body 33 is completely fitted with the inner wall of the upper cover 2, eliminating the uncertainty of the pressing depth during assembly and preventing deformation of the plate due to overpressure or loosening of the connection due to insufficient pressing, but also provides strong radial support for the main body 33, effectively suppressing the shaking or tilting of the fixing screw sleeve 3 under force. Of course, the length of the positioning post 31 can also be greater than or less than the wall thickness of the upper cover 2 without affecting the positioning purpose of the positioning post 31.

[0048] In a preferred embodiment, the end of the main body 33 away from the positioning post 31 has a protrusion 34, the diameter of which is smaller than the diameter of the main body 33. The end of the protrusion 34 away from the main body 33 abuts against the inner wall of the housing 1, increasing the additional support point between the housing 1 and the top cover 2, effectively suppressing the deformation of the top cover 2 under external load impact, reducing the vibration amplitude of the housing 1, and improving the connection rigidity between the housing 1 and the top cover 2.

[0049] In a preferred embodiment, the end of the main body 33 away from the protrusion 34 has an abutment surface 35. The abutment surface 35 abuts against the inner wall of the upper cover 2. The abutment surface 35 cooperates with the protrusion 34 to achieve bidirectional mechanical limiting of the fixing screw sleeve 3 in the axial direction. On the one hand, it avoids the fixing screw sleeve 3 from having axial movement gaps, ensuring that the fixing screw sleeve 3 always maintains the designed installation position during operation, and improving the connection reliability. On the other hand, the preload applied by the back locking bolt 4 is directly transmitted to the upper cover 2 through the abutment surface 35 and to the housing 1 through the protrusion 34, realizing a bidirectional load transmission path, effectively reducing local stress, and enhancing the connection stability between the housing 1 and the upper cover 2.

[0050] In a preferred embodiment, the end of the fixing sleeve 3 furthest from the positioning post 31 has a threaded groove 36. The threaded groove 36 engages with the threaded screw of the back-locking bolt 4 to reliably fix the back-locking bolt 4. Along the axial direction of the main body 33, the threaded groove 36 extends from the end face of the protrusion 34 into the main body 33, and the depth of the threaded groove 36 is less than the length of the fixing sleeve 3, that is, the threaded groove 36 does not penetrate the entire fixing sleeve 3, thereby improving the load-bearing strength of the fixing sleeve 3, effectively resisting the loosening tendency caused by vibration, and thus improving the connection strength between the fixing sleeve 3 and the back-locking bolt 4.

[0051] This utility model also provides an inverter that includes the above-mentioned explosion-proof structure and has the same beneficial effects.

[0052] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0053] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. An explosion-proof structure, characterized in that, It includes a fixing screw sleeve (3) between the housing (1) and the top cover (2) and a back locking bolt (4) on the housing (1). The fixing screw sleeve (3) is provided with a positioning post (31), which is matched with the positioning hole provided on the top cover (2). The fixing screw sleeve (3) is threadedly connected to the back locking bolt (4). The fixing screw sleeve (3) is provided with a welding part (32) at one end away from the back locking bolt (4), and the welding part (32) is welded to the top cover (2).

2. The explosion-proof structure according to claim 1, characterized in that, The welded part (32) is a transition surface (321) located at the end of the fixing sleeve (3) away from the back locking bolt (4); along the axial direction of the fixing sleeve (3), the diameter of the transition surface (321) gradually decreases in the direction close to the positioning post (31); an annular weld is formed between the transition surface (321) and the upper cover (2).

3. The explosion-proof structure according to claim 2, characterized in that, The transition surface (321) is an arc surface or a conical surface.

4. The explosion-proof structure according to claim 1, characterized in that, The welded part (32) is a flange ring (322) located at the end of the fixing sleeve (3) away from the back locking bolt (4). The diameter of the flange ring (322) is larger than the diameter of the fixing sleeve (3). A welded gap is formed between the flange ring (322) and the upper cover (2).

5. The explosion-proof structure according to any one of claims 1 to 4, characterized in that, The fixing screw sleeve (3) includes a main body (33), which is coaxially arranged with the positioning post (31), and the diameter of the main body (33) is larger than the diameter of the positioning post (31).

6. The explosion-proof structure according to claim 5, characterized in that, Along the axial direction of the main body (33), the length of the positioning post (31) is equal to the wall thickness of the upper cover (2).

7. The explosion-proof structure according to claim 5, characterized in that, The main body (33) has a protrusion (34) at one end away from the positioning post (31), and the diameter of the protrusion (34) is smaller than the diameter of the main body (33); the end of the protrusion (34) away from the main body (33) abuts against the inner wall of the box (1).

8. The explosion-proof structure according to claim 7, characterized in that, The main body (33) has an abutting surface (35) at one end away from the protrusion (34), and the abutting surface (35) abuts against the inner wall of the upper cover (2).

9. The explosion-proof structure according to claim 8, characterized in that, The fixing sleeve (3) has a threaded groove (36) at the end away from the positioning post (31), and the threaded groove (36) is threaded with the screw of the back locking bolt (4); along the axial direction of the main body (33), the threaded groove (36) extends from the end face of the protrusion (34) into the main body (33); the depth of the threaded groove (36) is less than the length of the fixing sleeve (3).

10. An inverter, characterized in that, Includes the explosion-proof structure as described in any one of claims 1 to 9.

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