Photovoltaic inverter and cable waterproof structure thereof

Abstract

The utility model discloses a photovoltaic inverter and a cable waterproof structure thereof, the cable waterproof structure is applied to the photovoltaic inverter, a casing of the photovoltaic inverter is provided with a through hole for a cable to pass through, and the cable waterproof structure comprises a sealing ring and a cable fixing assembly; the sealing ring is used for being arranged between the inner peripheral wall of the through hole of the machine shell and the outer peripheral wall of the cable and can generate elastic deformation. The cable fixing assembly is used for being arranged on the outer end face of a through hole of a machine shell, fixing the part, located on the outer side of the through hole, of a cable and pressing a sealing ring into the through hole, so that the sealing ring is elastically deformed and is in interference abutting fit with the inner circumferential wall of the through hole and the outer circumferential wall of the cable. In this way, the inner ring of the sealing ring which is elastically deformed abuts against the outer circumferential wall of the cable in an interference mode, the outer ring of the sealing ring abuts against the inner circumferential wall of the through hole in an interference mode, then the sealing ring is tightly sealed between the through hole of the machine shell and the cable, the stability of the waterproof performance of the cable is improved, and the risk that the machine shell leaks water is eliminated as much as possible.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic inverters, and particularly relates to a photovoltaic inverter and a cable waterproof structure thereof. Background Art

[0002] At present, a photovoltaic inverter needs to connect several cables for outputting and inputting electric energy.

[0003] In an installation form of the cable, each cable is fixed and waterproofed through a cable jacket; wherein, the cable jacket is first fixed to the casing of the photovoltaic inverter, then the cable is inserted into the cable jacket and the casing, and finally the waterproof structure of the cable jacket is tightened to form a seal.

[0004] This installation form of the cable is relatively reliable and mature, but the waterproof performance or effect of the cable is unstable, there is a risk of water leakage in the casing, and each cable needs to be independently installed through a cable jacket, and multiple cable jackets are also used in the photovoltaic inverter, so the production cost of the photovoltaic inverter is high and the efficiency is low. Content of the Utility Model

[0005] In view of this, the utility model provides a cable waterproof structure, which helps to improve the stability of the cable waterproof performance and eliminates the risk of water leakage in the casing as much as possible.

[0006] To achieve the above object, the utility model provides the following technical solutions:

[0007] A cable waterproof structure is applied to a photovoltaic inverter. The casing of the photovoltaic inverter has through holes for the cables to pass through, and includes: a sealing ring and a cable fixing component;

[0008] The sealing ring is used to be arranged between the inner peripheral wall of the through hole of the casing and the outer peripheral wall of the cable, and can undergo elastic deformation;

[0009] The cable fixing component is used to be arranged on the outer end face of the through hole of the casing, and is used to fix the part of the cable outside the through hole, and is used to press the sealing ring in the through hole, so that the sealing ring undergoes elastic deformation and forms an interference abutting fit with the inner peripheral wall of the through hole and the outer peripheral wall of the cable respectively.

[0010] Preferably, the number of the through holes is multiple for multiple cables to pass through one by one;

[0011] The sealing ring is a multi-sealing ring assembly, the multi-sealing ring assembly has multiple sealing ring monomers, and is used to be arranged between the inner peripheral walls of multiple through holes and the outer peripheral walls of multiple cables one by one, and can all undergo elastic deformation;

[0012] The cable fixing assembly is a multi-cable fixing assembly, and is used to fix the parts of the multiple cables located outside the through holes one by one, and to press the multiple sealing ring monomers of the multi-sealing ring assembly into the multiple through holes one by one, so that each of the sealing ring monomers undergoes elastic deformation and forms an interference fit with the inner circumferential wall of the through hole and the outer circumferential wall of the cable respectively.

[0013] Preferably, the multi-seal ring assembly comprises: a plurality of the seal ring monomers and a connection pad;

[0014] The outer end surfaces of the plurality of sealing ring units are flush with the outer end surfaces of the plurality of through holes;

[0015] The connection pad is connected to the outer end surfaces of the plurality of sealing ring monomers and protrudes from the outer end surfaces of the plurality of through holes; wherein the connection pad is provided with a plurality of second through holes which are connected one by one with the inner holes of the plurality of sealing ring monomers, so as to allow the plurality of cables to pass through one by one;

[0016] The multi-cable fixing assembly is used to adhere to and press the first surface of the connection pad away from the plurality of sealing ring units, so as to press the plurality of sealing ring units one by one into the plurality of through holes.

[0017] Preferably, the through hole is a tapered through hole, the small end of the tapered through hole is located on the inner side of the housing, and the large end is located on the outer side of the housing;

[0018] The sealing ring monomer is a conical sealing ring monomer, and the outer peripheral wall of the conical sealing ring monomer is a conical outer peripheral wall, and is used to adapt to the conical inner peripheral wall of the conical through hole.

[0019] Preferably, an annular groove is formed on the conical outer peripheral wall or the inner peripheral wall of the conical sealing ring unit.

[0020] Preferably, there are multiple annular grooves, which are evenly distributed along the axial direction of the conical sealing ring unit.

[0021] Preferably, the multi-cable fixing assembly comprises: a multi-cable fixing body and a fastening assembly;

[0022] The multi-cable fixing body is tightened to the outer end surfaces of the plurality of through holes through the fastening assembly. The multi-cable fixing body is used to fix the portions of the plurality of cables located outside the through holes one by one, and to fit with the first surface of the connection pad, and to press the first surface of the connection pad while being tightened to the outer end surfaces of the plurality of through holes.

[0023] Preferably, the multi-cable fixing body comprises a multi-cable sheath.

[0024] Preferably, the fastening assembly is a screw assembly.

[0025] A photovoltaic inverter includes a cable waterproof structure, and the cable waterproof structure is the cable waterproof structure as described above.

[0026] As can be seen from the above technical solution, for the cable waterproof structure provided by the present utility model, a sealing ring capable of elastic deformation is arranged between the inner peripheral wall of the through hole of the casing and the outer peripheral wall of the cable. Then, the sealing ring is pressed tightly in the through hole by a cable fixing component, so that the sealing ring undergoes elastic deformation and forms an interference abutting fit with the inner peripheral wall of the through hole and the outer peripheral wall of the cable respectively. That is, the inner ring of the sealing ring after elastic deformation interferes and abuts against the outer peripheral wall of the cable, and the outer ring interferes and abuts against the inner peripheral wall of the through hole. That is, the sealing ring interferes and abuts between the inner peripheral wall of the through hole of the casing and the outer peripheral wall of the cable, thereby forming a tight seal between the through hole of the casing and the cable, which helps to improve the stability of the cable waterproof performance and eliminate the risk of water leakage from the casing as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0028] Figure 1 An exploded view of the cable waterproof structure provided by the embodiment of the present utility model;

[0029] Figure 2 A cross-sectional view of the cable waterproof structure provided by the embodiment of the present utility model;

[0030] Figure 3 An exploded cross-sectional view of the cable waterproof structure provided by the embodiment of the present utility model;

[0031] Figure 4 A cross-sectional view of the structure of the multi-sealing ring assembly provided by the embodiment of the present utility model.

[0032] Among them, 1 is the casing, and 1.1 is the tapered through hole;

[0033] 2 is the multi-sealing ring assembly, 21 is the sealing ring monomer, 21.1 is the tapered outer peripheral wall, 21.2 is the annular groove, 21.3 is the inner hole, 21.4 is the large-head end face, 22 is the connecting pad, and 22.1 is the second through hole;

[0034] 3 is the cable;

[0035] 4 is the multi-cable sheath;

[0036] 5 is a screw assembly. Detailed implementation mode

[0037] The utility model discloses a cable waterproof structure for a photovoltaic inverter, which can fix multiple cables on a casing simultaneously, is easy to assemble, has low cost, and has stable waterproof performance.

[0038] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0039] The cable waterproof structure provided by the embodiment of the present utility model is applied to a photovoltaic inverter, such as Figure 1 shown, the casing 1 of the photovoltaic inverter has a through hole for the cable 3 to pass through. The cable waterproof structure includes: a sealing ring and a cable fixing assembly;

[0040] As Figure 2 shown, the sealing ring is used to be arranged between the inner peripheral wall of the through hole of the casing 1 and the outer peripheral wall of the cable 3, and can undergo elastic deformation;

[0041] The cable fixing assembly is used to be arranged on the outer end face of the through hole of the casing 1, and is used to fix the part of the cable 3 outside the through hole, and is used to press the sealing ring in the through hole, so that the sealing ring undergoes elastic deformation and respectively forms an interference abutting fit with the inner peripheral wall of the through hole and the outer peripheral wall of the cable 3.

[0042] It should be noted that the through hole of the casing 1 of the photovoltaic inverter is the cable passing hole, that is, the cable 3 passes through it and enters the casing 1 to be electrically connected to relevant components; the sealing ring is used to be sleeved between the inner peripheral wall of the through hole of the casing 1 and the outer peripheral wall of the cable 3, and can undergo axial elastic deformation when being axially pressed or extruded; for example, under the pressing action (extrusion action) of the cable fixing assembly, the sealing ring can be elastically thickened axially, so that the outer ring of the sealing ring forms an interference abutting fit with the inner peripheral wall of the through hole, and the inner ring forms an interference abutting fit with the outer peripheral wall of the cable 3, that is, a tight seal is formed between the outer ring of the sealing ring and the inner peripheral wall of the through hole, and a tight seal is formed between the inner ring and the outer peripheral wall of the cable 3, that is, a tight seal is formed between the inner peripheral wall of the through hole of the casing 1 and the outer peripheral wall of the cable 3 by the sealing ring, which helps to improve the stability of the waterproof performance of the cable and facilitate eliminating the risk of water leakage of the casing as much as possible;

[0043] The cable fixing assembly is used to be fixed on the outer end face of the through hole of the casing 1. In addition to being used to fix the portion of the cable 3 located outside the through hole, it is convenient to fix the cable 3 on the casing 1, and is also used to press the sealing ring into the through hole, that is, it is also used to further press the sealing ring into the through hole, that is, to squeeze the outer end face of the sealing ring (the end face facing the outside of the casing 1) so that the sealing ring undergoes elastic deformation in the axial direction (such as becoming thicker), and forms an interference fit with the inner circumferential wall of the through hole and the outer circumferential wall of the cable 3 respectively, that is, the inner ring of the sealing ring after elastic deformation is interference-fitted against the outer circumferential wall of the cable 3, and the outer ring is interference-fitted against the inner circumferential wall of the through hole, that is, the sealing ring after elastic deformation is interference-fitted between the inner circumferential wall of the through hole and the outer circumferential wall of the cable 3, so that the sealing ring forms a tight seal between the inner circumferential wall of the through hole and the outer circumferential wall of the cable 3;

[0044] In addition, the sealing ring may be made of a polymer elastic material, such as an elastic rubber material; in addition, the position of the inner end face of the sealing ring (the end face facing the inner side of the housing 1) in the through hole of the housing 1 may be fixed, so that the cable fixing assembly can form a pressing or squeezing force on the sealing ring; wherein a limiting structure may be provided in the through hole of the housing 1 to achieve the limiting of the inner end face of the sealing ring in the through hole;

[0045] Of course, the cable waterproof structure provided by this solution can be applied to the waterproofing of a single cable of a photovoltaic inverter, and can also be applied to the waterproofing of multiple cables. The details of the waterproofing of multiple cables can be seen in the following description. In addition, it can also be applied to the waterproofing of cables of other electronic devices or electronic equipment. Among them, when applied to the waterproofing of a single cable of a photovoltaic inverter, the outer end face of the sealing ring can protrude from the outer end face of the through hole of the housing 1, so that the cable fixing assembly can press the sealing ring to cause it to undergo elastic deformation.

[0046] That is to say, the cable waterproof structure provided by the present scheme adopts a sealing ring that can undergo elastic deformation and is arranged between the inner circumferential wall of the through hole of the casing 1 and the outer circumferential wall of the cable 3, and then the sealing ring is pressed in the through hole through a cable fixing assembly, so that the sealing ring undergoes elastic deformation and forms an interference fit with the inner circumferential wall of the through hole and the outer circumferential wall of the cable 3 respectively, that is, the inner ring of the sealing ring after elastic deformation is interference-fitted against the outer circumferential wall of the cable 3, and the outer ring is interference-fitted against the inner circumferential wall of the through hole, that is, the sealing ring is interference-fitted between the inner circumferential wall of the through hole of the casing 1 and the outer circumferential wall of the cable 3, and then the sealing ring forms a tight seal between the through hole of the casing 1 and the cable 3, thereby helping to improve the stability of the cable waterproof performance, and at the same time can also achieve reliable waterproof sealing between the cable and the casing, thereby eliminating the risk of water leakage in the casing as much as possible.

[0047] In this scheme, if Figure 1 As shown, there are multiple through holes, so that multiple cables 3 can pass through one by one;

[0048] As shown Figure 2 in the figure, the sealing ring is a multi-sealing-ring assembly 2. The multi-sealing-ring assembly 2 has a plurality of sealing-ring monomers 21, and is used to be respectively arranged between the inner peripheral walls of a plurality of through holes and the outer peripheral walls of a plurality of cables 3, and can all undergo elastic deformation;

[0049] The cable fixing assembly is a multi-cable fixing assembly, and is used to fix the parts of the plurality of cables 3 located outside the through holes respectively, and is used to press the plurality of sealing-ring monomers 21 of the multi-sealing-ring assembly 2 into the plurality of through holes respectively, so that each sealing-ring monomer 21 undergoes elastic deformation and respectively forms an interference abutting fit with the inner peripheral wall of the through hole and the outer peripheral wall of the cable 3.

[0050] It should be noted that, as shown Figure 1 in the figure, the plurality of through holes of the housing 1 can be distributed in parallel and can be four; the multi-sealing-ring assembly 2 has a plurality of sealing-ring monomers 21 and a sealing-ring connecting part. The plurality of sealing-ring monomers 21 can be distributed in parallel, and their outer end faces are connected to the sealing-ring connecting part; wherein, the plurality of sealing-ring monomers 21 can be respectively arranged between the inner peripheral walls of the plurality of through holes and the outer peripheral walls of the plurality of cables 3, and the sealing-ring connecting part can be located at the outer end faces of the plurality of through holes; the multi-cable fixing assembly is used to be fixed at the outer end faces of the plurality of through holes of the housing 1. In addition to fixing the parts of the plurality of cables 3 located outside the through holes respectively, it is also used to press the plurality of sealing-ring monomers 21 of the multi-sealing-ring assembly 2 into the plurality of through holes respectively. Actually, the multi-cable fixing assembly is also used to press (extrude) the sealing-ring connecting part, so that each sealing-ring monomer 21 undergoes elastic deformation and respectively forms an interference abutting fit with the inner peripheral wall of the through hole and the outer peripheral wall of the cable 3, that is, the inner ring of each sealing ring after elastic deformation interferes and abuts against the outer peripheral wall of the cable 3, and the outer ring interferes and abuts against the inner peripheral wall of the through hole, that is, each sealing ring forms a tight seal between the through hole of the housing 1 and the cable 3, which helps to improve the stability of the waterproof performance of the plurality of cables, and can also realize the installation of the plurality of cables 3 on the housing 1 together. Moreover, by adopting the multi-sealing-ring assembly 2, it is convenient for the installation and removal of the plurality of sealing-ring monomers 21.

[0051] That is to say, through the use of the multi-sealing-ring assembly 2 and the multi-cable fixing assembly in this solution, the installation and reliable waterproofing of the plurality of cables on the housing 1 can be realized, which is beneficial to reducing the production cost of the photovoltaic inverter and improving the production efficiency of the photovoltaic inverter.

[0052] Specifically, as shown Figure 1 in the figure, the multi-sealing-ring assembly 2 includes: a plurality of sealing-ring monomers 21 and a connecting pad 22; wherein, the connecting pad 22 is the sealing-ring connecting part mentioned above;

[0053] As shown Figure 2As shown, the outer end faces of multiple seal ring monomers 21 are flush with the outer end faces of multiple through holes one by one;

[0054] The connecting pad 22 is connected to the outer end faces of multiple seal ring monomers 21 and protrudes from the outer end faces of multiple through holes, thereby facilitating the fitting and pressing (extrusion) of the multi-cable fixing assembly; among them, as Figure 3 and Figure 4 shown, the connecting pad 22 is provided with multiple second through holes 22.1 that are in one-to-one communication with the inner holes 21.3 of multiple seal ring monomers 21 for multiple cables 3 to pass through one by one. The second through holes 22.1 of the connecting pad 22 are also the cable through holes;

[0055] The multi-cable fixing assembly is used to fit and press the first surface of the connecting pad 22 facing away from multiple seal ring monomers 21 to press multiple seal ring monomers 21 into multiple through holes one by one. Among them, during the process of the multi-cable fixing assembly fitting and pressing the first surface of the connecting pad 22, it can press multiple seal ring monomers 21 into multiple through holes one by one, so that each seal ring monomer 21 undergoes elastic deformation and forms an interference abutting fit with the inner peripheral wall of the through hole and the outer peripheral wall of the cable 3 respectively. Of course, both the seal ring monomer 21 and the connecting pad 22 can undergo elastic deformation. That is to say, the multi-seal ring assembly 2 adopts a structural form in which multiple seal ring monomers 21 are connected to the connecting pad 22, which not only facilitates the installation and removal of multiple seal ring monomers 21, but also facilitates the multi-cable fixing assembly to fit and press the multi-seal ring assembly 2.

[0056] Furthermore, as Figure 3 shown, the through hole is a tapered through hole 1.1, the small end of the tapered through hole 1.1 is located inside the housing 1, and the large end is located outside the housing 1; among them, the structural form of the tapered through hole 1.1 on the housing 1 is small inside and large outside;

[0057] The seal ring monomer 21 is a tapered seal ring monomer, the outer peripheral wall of the tapered seal ring monomer is a tapered outer peripheral wall 21.1, and it is used to fit with the tapered inner peripheral wall of the tapered through hole 1.1.

[0058] Among them, the taper of the conical through-hole 1.1 is the same as that of the conical outer peripheral wall 21.1 of the conical sealing ring monomer. Moreover, to facilitate the elastic deformation of the conical sealing ring monomer under the pressing of the multi-cable fixing assembly, the size of the conical outer peripheral wall 21.1 of the conical sealing ring monomer can be slightly larger than that of the conical inner peripheral wall of the conical through-hole 1.1. Thus, it is convenient for the conical outer peripheral wall 21.1 of the conical sealing ring monomer to form an interference abutting fit with the conical inner peripheral wall of the conical through-hole 1.1. The through-hole of the housing 1 adopts the conical through-hole 1.1, and the sealing ring monomer 21 adopts a conical sealing ring monomer adapted to the conical through-hole 1.1. This not only facilitates the installation of the sealing ring monomer 21 in the through-hole, but also, under the pressing action (extrusion action) of the multi-cable fixing assembly, facilitates the formation of an interference abutting fit between the outer peripheral wall of the sealing ring monomer 21 and the inner peripheral wall of the through-hole. Of course, the through-hole can also adopt an equal-diameter through-hole, and the sealing ring monomer 21 can also correspondingly adopt a sealing ring monomer with an equal-diameter outer peripheral wall, which will not be elaborated here.

[0059] Furthermore, as Figure 4 shown, an annular groove 21.2 is provided on the conical outer peripheral wall 21.1 or the inner peripheral wall of the conical sealing ring monomer. Among them, the conical outer peripheral wall 21.1 of the conical sealing ring monomer can be provided with an annular groove 21.2, which can facilitate the accommodation of the accumulation of the conical sealing ring monomer material due to elastic deformation, avoid hindering the elastic deformation of the conical sealing ring monomer, and also facilitate the tight fitting of the connecting pad 22 and the multi-cable fixing assembly without generating extra gaps.

[0060] In this solution, as Figure 4 shown, the number of the annular grooves 21.2 is multiple and evenly distributed along the axial direction of the conical sealing ring monomer. Among them, the multiple annular grooves 21.2 can be evenly distributed along the axial direction on the conical outer peripheral wall 21.1 of the conical sealing ring monomer. In this way, it can be more convenient to accommodate the accumulation of the conical sealing ring monomer material due to elastic deformation, more beneficial to avoid hindering the elastic deformation of the conical sealing ring monomer, and also more helpful for the tight fitting of the connecting pad 22 and the multi-cable fixing assembly. Among them, as Figure 4 shown, the number of the annular grooves 21.2 can be two, and the structure of the two annular grooves 21.2 can refer to Figure 4 shown.

[0061] Specifically, the multi-cable fixing assembly includes: a multi-cable fixing body and a fastening component;

[0062] The multi-cable fixing body is tightened to the outer end faces of a plurality of through holes through a fastening component. The multi-cable fixing body is used to fix one by one the portions of the plurality of cables 3 located outside the through holes, and is used to fit with the first surface of the connection pad 22, and also presses the first surface of the connection pad 22 during the process of being tightened to the outer end faces of the plurality of through holes. Among them, the multi-cable fixing body is screwed to the outer end faces of the plurality of through holes through a fastening component. The fastening component can be a bolt component or a screw component. Moreover, the multi-cable fixing body has two functions. One is to fix one by one the portions of the plurality of cables 3 located outside the through holes, so that the plurality of cables 3 are fixed on the casing 1. The other function is to fit with the first surface of the connection pad 22, and also presses the first surface of the connection pad 22 during the process of being tightened to the outer end faces of the plurality of through holes, so as to press one by one the plurality of sealing ring monomers 21 in the plurality of through holes. That is to say, the multi-cable fixing component is tightened to the outer end faces of the plurality of through holes, which can make the assembly and fixation of the multi-cable fixing component on the casing 1 convenient.

[0063] Further, as Figure 1 shown, the multi-cable fixing body includes a multi-cable sheath 4. Among them, the multi-cable sheath 4 is sleeved on the plurality of cables 3 one by one, and the plurality of cables 3 can be fixed together with the multi-cable sheath 4 by means of encapsulation injection molding or bonding, etc., which is convenient for forming a cable assembly. Then, the plurality of sealing ring monomers 21 of the multi-sealing ring assembly 2 are sleeved on the plurality of cables 3 of the cable assembly one by one. Then, the plurality of sealing ring monomers 21 are inserted into the plurality of through holes of the plurality of casings 1 one by one. During this process, the plurality of cables 3 of the cable assembly have also passed through the plurality of through holes of the casing 1 one by one. Then, the multi-cable sheath 4 is fitted to the outer end faces of the plurality of through holes and the first surface of the connection pad 22 of the multi-sealing ring assembly 2. Finally, the multi-cable sheath 4 is tightened to the outer end faces of the plurality of through holes of the casing 1 through a fastening component; of course, during this process, the multi-cable sheath 4 also presses the first surface of the connection pad 22, so that the plurality of sealing ring monomers 21 are pressed one by one in the plurality of through holes to generate elastic deformation.

[0064] In addition, the multi-cable sheath 4 can adopt an existing cable sheath structure. In addition, as Figure 1 shown, the casing 1 is provided with a connection pad installation positioning groove for cooperating with the connection pad 22 of the multi-sealing ring assembly 2 at the outer end faces of the plurality of through holes, and is also provided with a cable sheath installation positioning groove for cooperating with the multi-cable sheath 4. The connection pad installation positioning groove is located in the cable sheath installation positioning groove, which can facilitate the convenient installation of the multi-sealing ring assembly 2 and the multi-cable sheath 4.

[0065] Still further, as Figure 1As shown, the fastening component is the screw component 5. Among them, the screw component 5 may include two screws. That is to say, after the multi-cable sheath 4 is installed in the cable sheath installation positioning groove of the casing 1, the multi-cable sheath 4 is fastened to the cable sheath installation positioning groove by two screws, so that the multi-cable sheath 4 is easy to install on the casing 1, and the cooperation of the multi-cable sheath 4 and the screw component 5 also helps to improve the installation method of the multiple cables 3. Of course, the fixing method of the multi-cable sheath 4 on the casing 1 can also be riveting, bonding or clamping, which will not be elaborated here.

[0066] In addition, to better understand the cable waterproof structure for a photovoltaic inverter provided by this solution, the usage process of the cable waterproof structure can be described as follows:

[0067] First, pass and fix multiple cables 3 one by one through the multi-cable sheath 4 to form a cable assembly. Then, put multiple sealing ring monomers 21 of the multi-sealing ring assembly 2 one by one on the multiple cables 3 of the cable assembly. Next, install the multiple sealing ring monomers 21 one by one into multiple through holes of the multiple casings 1. During this process, the multiple cables 3 have also passed through the multiple through holes of the casing 1 one by one. Then, fit the multi-cable sheath 4 to the outer end faces of the multiple through holes and the first face of the connecting pad 22. Finally, tighten the multi-cable sheath 4 to the outer end faces of the multiple through holes by two screws. During this process, the end face of the multi-cable sheath 4 will also press the multiple sealing ring monomers 21 one by one into the multiple through holes (press tightly in the multiple through holes), so that the sealing ring monomers 21 undergo elastic deformation, that is, the tapered outer peripheral wall (conical surface) of the sealing ring monomer 21 forms an appropriate interference fit with the tapered inner peripheral wall of the tapered hole through hole 1.1, so that the tapered outer peripheral wall of the sealing ring monomer 21 and the tapered inner peripheral wall of the tapered hole through hole 1.1 form a seal. And because the force is mutual, the pressure formed by the interference fit of the tapered outer peripheral wall of the sealing ring monomer 21 also squeezes towards the inner peripheral wall of the sealing ring monomer 21, so that a pressure is also formed between the inner peripheral wall of the sealing ring monomer 21 and the outer peripheral wall of the cable 3, and further a seal is also formed between the inner peripheral wall of the sealing ring monomer 21 and the outer peripheral wall of the cable 3.

[0068] It can be seen that the cable waterproof structure for a photovoltaic inverter provided by this solution can achieve reliable waterproof sealing between the cable and the casing, and also makes the production and assembly of the photovoltaic inverter convenient, low-cost, and highly applicable. It can be used to fix various cables with different quantities and sizes, and also helps to reduce the volume of the photovoltaic inverter.

[0069] The embodiment of the present invention also provides a photovoltaic inverter, including a cable waterproof structure, and the cable waterproof structure is the cable waterproof structure as described above. Since this solution adopts the above cable waterproof structure, it thus has corresponding beneficial effects, which can be specifically referred to the previous description and will not be elaborated here.

[0070] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts among the various embodiments can be referred to each other.

[0071] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A cable waterproof structure, applied to a photovoltaic inverter, wherein the housing (1) of the photovoltaic inverter has a through hole for a cable (3) to pass through, characterized in that: include: Sealing ring and cable fixing assembly; The sealing ring is used to be arranged between the inner peripheral wall of the through hole of the housing (1) and the outer peripheral wall of the cable (3), and is capable of elastic deformation; The cable fixing assembly is used to be arranged on the outer end surface of the through hole of the housing (1), and is used to fix the portion of the cable (3) located outside the through hole, and is used to press the sealing ring into the through hole so that the sealing ring undergoes elastic deformation and forms an interference fit with the inner peripheral wall of the through hole and the outer peripheral wall of the cable (3), respectively.

2. The cable waterproof structure according to claim 1, characterized in that: The number of the through holes is plural, so as to allow the plurality of cables (3) to pass through one by one; The sealing ring is a multi-sealing ring assembly (2), the multi-sealing ring assembly (2) having a plurality of sealing ring monomers (21) and being used to be arranged one by one between the inner peripheral walls of the plurality of through holes and the outer peripheral walls of the plurality of cables (3), and all of which are capable of elastic deformation; The cable fixing assembly is a multi-cable fixing assembly and is used to fix the portions of the plurality of cables (3) located outside the through holes one by one, and to press the plurality of sealing ring monomers (21) of the multi-sealing ring assembly (2) into the plurality of through holes one by one, so that each of the sealing ring monomers (21) undergoes elastic deformation and forms an interference fit with the inner peripheral wall of the through hole and the outer peripheral wall of the cable (3), respectively.

3. The cable waterproof structure according to claim 2, characterized in that: The multi-sealing ring assembly (2) comprises: a plurality of sealing ring units (21) and a connecting pad (22); The outer end surfaces of the plurality of sealing ring monomers (21) are flush with the outer end surfaces of the plurality of through holes; The connection pad (22) is connected to the outer end surfaces of the plurality of sealing ring monomers (21) and protrudes from the outer end surfaces of the plurality of through holes; wherein the connection pad (22) is provided with a plurality of second through holes (22.1) which are connected one by one with the inner holes (21.3) of the plurality of sealing ring monomers (21) so as to allow the plurality of cables (3) to pass through one by one; The multi-cable fixing assembly is used to adhere to and press the first surface of the connection pad (22) away from the plurality of sealing ring monomers (21), so as to press the plurality of sealing ring monomers (21) one by one into the plurality of through holes.

4. The cable waterproof structure according to claim 3, characterized in that: The through hole is a conical through hole (1.1), the small end of the conical through hole (1.1) is located on the inner side of the housing (1), and the large end is located on the outer side of the housing (1); The sealing ring monomer (21) is a conical sealing ring monomer, and the outer peripheral wall of the conical sealing ring monomer is a conical outer peripheral wall (21.1) and is used to match the conical inner peripheral wall of the conical through hole (1.1).

5. The cable waterproof structure according to claim 4, characterized in that: An annular groove (21.2) is provided on the conical outer peripheral wall (21.1) or the inner peripheral wall of the conical sealing ring monomer.

6. The cable waterproof structure according to claim 5, characterized in that: The annular grooves (21.2) are multiple in number and are evenly distributed along the axial direction of the conical sealing ring monomer.

7. The cable waterproof structure according to claim 3, characterized in that: The multi-cable fixing assembly comprises: a multi-cable fixing body and a fastening assembly; The multi-cable fixing body is screwed onto the outer end surfaces of the plurality of through holes through the fastening assembly, and the multi-cable fixing body is used to fix the portions of the plurality of cables (3) located outside the through holes one by one, and to fit with the first surface of the connection pad (22), and to press the first surface of the connection pad (22) during the process of being screwed onto the outer end surfaces of the plurality of through holes.

8. The cable waterproof structure according to claim 7, characterized in that: The multi-cable fixing body comprises a multi-cable sheath (4).

9. The cable waterproof structure according to claim 7, characterized in that: The fastening assembly is a screw assembly (5).

10. A photovoltaic inverter, comprising a cable waterproof structure, characterized in that: The cable waterproof structure is the cable waterproof structure as described in any one of claims 1 to 9.

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