Dual-layer waterproof mobile terminal protective case having screen protector

Abstract

Disclosed in the present invention is a dual-layer waterproof mobile terminal protective case having a screen protector, comprising a rear shell, a screen protector, a sealing film, and a snap-fitting member. The rear shell comprises a rear wall and a peripheral wall surrounding the periphery of the rear wall; the rear wall and the peripheral wall define an accommodating recess used for accommodating a mobile terminal; a snap-fitting slot surrounding the accommodating recess is formed in the front surface of the peripheral wall. The shape of the screen protector is matched with the opening of the accommodating recess, the sealing film is flexible, and the sealing film is sealingly connected to the periphery of the screen protector and extends towards the periphery of the screen protector. The snap-fitting member comprises a snap-fitting part; the shape of the snap-fitting part is matched with the snap-fitting slot; the snap-fitting part is in interference fit with the snap-fitting slot; and the snap-fitting part and the inner wall of the snap-fitting slot clamp the sealing film, and the screen protector can be attached to the screen of the mobile terminal, so that the protective case has excellent waterproof and dustproof performance.

Description

A double-layer waterproof mobile terminal protective case Technical Field

[0001] The present invention relates to the technical field of a double-layer waterproof mobile terminal protective shell with a film, and in particular to a double-layer waterproof mobile terminal protective shell with a film. Background Art

[0002] Mobile terminals are portable and easy to carry, but they are also exposed to external environmental influences such as water immersion, dust erosion, and hard surface bumps. In order to increase the service life of mobile terminals and maintain their aesthetic appearance, they are often covered with protective cases.

[0003] At present, protective cases include semi-enclosed structures and fully enclosed structures. The semi-enclosed structure exposes the front of the mobile terminal and cannot protect the screen of the mobile terminal. Water and dust can enter the protective case through the gap between the mobile terminal and the protective case, causing the sides and back of the mobile terminal to be eroded by water and dust. The fully enclosed structure is often a split structure, including multiple components assembled with each other. The structural dimensional accuracy of each component is high, the anti-drop and anti-collision performance is poor, and it is easy to deform, which leads to the sealing performance becoming worse and worse. After long-term use or bumps, it may become impossible to reassemble.

[0004] Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a double-layer waterproof mobile terminal protective case with a film, which is drop-proof, easy to disassemble and assemble, and has excellent dustproof and waterproof properties.

[0006] According to an embodiment of the first aspect of the present invention, a film-attached double-layer waterproof mobile terminal protective case includes a rear shell, a front cover and a fastening piece. The rear shell includes a rear wall and a peripheral wall around the outer periphery of the rear wall, the rear wall and the peripheral wall form a storage groove for accommodating the mobile terminal, the front surface of the peripheral wall is provided with a fastening groove surrounding the storage groove, and the side wall of the fastening groove is elastic; the front cover includes a screen protective film and a sealing film, the shape of the screen protective film matches the notch of the storage groove, the sealing film is flexible, the sealing film is sealed and connected to the periphery of the screen protective film and extends around the screen protective film; the fastening piece includes a fastening part, the shape of the fastening part matches the fastening groove, the fastening part is interference fit with the fastening groove, and the fastening part and the inner wall of the fastening groove clamp the sealing film to form a seal between the sealing film and the inner wall of the fastening groove, and the screen protective film can be attached to the screen of the mobile terminal.

[0007] It has at least the following beneficial effects:

[0008] The side wall of the snapping groove is elastic, the snapping part is interference fit with the snapping groove, and the snapping part and the inner wall of the snapping groove clamp the sealing film, so a first seal is formed between the outer wall of the snapping part and the inner wall of the snapping groove away from the receiving groove, a second seal is formed between the inner wall of the snapping part and one side of the sealing film, and a third seal is formed between the other side of the sealing film and the inner wall of the snapping groove close to the receiving groove. If foreign matter such as water and dust enters the receiving groove and corrodes the mobile terminal, it is necessary to break through the first seal and the third seal at the same time, or break through the second seal and the third seal. In other words, the protective case has a double-layer sealing structure, which makes the sealing performance of the protective case more superior. The screen protective film and the sealing film are connected as a whole, and the inner walls of the buckling part and the buckling groove clamp the sealing film. The sealing film is flexible. Even if the back shell, the buckling groove and the buckling part are slightly deformed due to being dropped or used for a long time, or there are certain errors in the dimensions of the peripheral wall, the buckling part and the buckling groove, the back shell, the buckling part and the front cover can still be easily assembled, and the first seal, the first seal and the third seal will not fail.

[0009] According to some embodiments of the present invention, the snap-fit ​​groove has a first inner side wall and a second inner side wall, the second inner side wall is arranged around the outside of the first inner side wall, the first inner side wall is provided with a first barb portion, and the second inner side wall is provided with a second barb portion, and the inner wall and outer wall of the snap-fit ​​portion are respectively provided with a first hook portion and a second hook portion, the first hook portion is hooked on the first barb portion, and the second hook portion is hooked on the second barb portion.

[0010] According to some embodiments of the present invention, the buckling portion has toughness.

[0011] According to some embodiments of the present invention, the fastening part also includes a main body and a stopper, the outer shape of the main body matches the outer shape of the fastening part, the upper end of the fastening part is connected to the lower end of the main body, and the stopper is connected to the inner wall of the main body, and the stopper is used to rest against the front surface of the screen protective film.

[0012] According to some embodiments of the present invention, the main body, the buckling portion and the blocking portion are an integrally formed structure.

[0013] According to some embodiments of the present invention, a charging port through hole is provided on the rear shell, and a plug is connected to the peripheral wall, and the plug is used to seal the charging port through hole.

[0014] According to some embodiments of the present invention, a microphone through hole is provided on the rear shell, and the microphone through hole is covered with a waterproof film.

[0015] According to some embodiments of the present invention, a speaker through hole is provided on the rear housing, and a slidable sealing plate is provided on the peripheral wall, and the sealing plate is used to seal the speaker through hole.

[0016] According to some embodiments of the present invention, the periphery of the front surface of the screen protective film or the periphery of the rear surface of the screen protective film is connected to the sealing film through the first adhesive layer.

[0017] According to some embodiments of the present invention, the rear surface of the screen protection film is provided with a second adhesive layer for laminating to the screen of the mobile terminal.

[0018] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0020] FIG1 is a schematic structural diagram of a double-layer waterproof mobile terminal protective case with a film according to an embodiment of the present invention;

[0021] FIG2 is a schematic diagram of an exploded structure of a double-layer waterproof mobile terminal protective case with a film according to an embodiment of the present invention;

[0022] FIG3 is a schematic cross-sectional view of a double-layer waterproof mobile terminal protective case with a film according to an embodiment of the present invention;

[0023] FIG4 is a partial enlarged schematic diagram of point A in FIG3 ;

[0024] FIG5 is a partial enlarged schematic diagram of point B in FIG3 ;

[0025] FIG6 is a schematic structural diagram of a double-layer waterproof mobile terminal protective case with a film attached, when the second adhesive layer and the sealing film are in a naturally unfolded state according to an embodiment of the present invention;

[0026] FIG7 is a schematic diagram of a state in which a sealing film of a double-layer waterproof mobile terminal protective case with a film is inserted into a buckling groove according to an embodiment of the present invention; and

[0027] FIG8 is a partial structural diagram of a rear shell, a plug, a sealing plate and a pressing block of a film-attached double-layer waterproof mobile terminal protective shell according to an embodiment of the present invention.

[0028] Figure numbers: rear shell 100, rear wall 110, peripheral wall 120, flange 121, microphone through hole 122, waterproof membrane 123, charging port through hole 124, plug 125, speaker through hole 126, sealing plate 127, pressure block 128, storage slot 130, mobile terminal 200, snap-fit ​​groove 300, first inner side wall 310, first barb portion 311, second inner side wall 320, second barb portion 321, screen protective film 400, first adhesive layer 410, second adhesive layer 420, sealing film 500, snap-fit ​​component 600, snap-fit ​​portion 610, first hook portion 611, second hook portion 612, blocking portion 620. DETAILED DESCRIPTION

[0029] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0030] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0031] In the description of the present invention, "a plurality" refers to more than two. The use of "first" or "second" is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of the indicated technical features, or implicitly indicating the order of the indicated technical features.

[0032] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0033] 1 to 5, the present invention discloses a film-coated double-layer waterproof mobile terminal protective case, comprising a rear shell 100, a front cover and a fastening member 600. The rear shell 100 comprises a rear wall 110 and a peripheral wall 120 surrounding the rear wall 110. The rear wall 110 and the peripheral wall 120 form a receiving groove 130 for receiving a mobile terminal 200. The front surface of the peripheral wall 120 is provided with a fastening groove 300 surrounding the receiving groove 130. The side wall of the fastening groove 300 is elastic. The front cover comprises a screen protective film 400 and a sealing film 500. The screen protective film 400 It is transparent, and the shape of the screen protective film 400 matches the notch of the storage groove 130. The sealing film 500 is flexible, and the sealing film 500 is sealed and connected to the periphery of the screen protective film 400 and extends around the screen protective film 400. The fastening part 600 includes a fastening portion 610, and the shape of the fastening portion 610 matches the fastening groove 300. The fastening portion 610 and the fastening groove 300 have an interference fit, and the fastening portion 610 and the inner wall of the fastening groove 300 clamp the sealing film 500, so that the screen protective film 400 can be attached to the screen of the mobile terminal 200.

[0034] 6 and 7 , the screen protection film 400 and the sealing film 500 are connected as a whole, which can be called a front cover. The rear shell 100 , the fastening member 600 and the front cover are three detachable components. When in use, the mobile terminal 200 is first placed into the storage groove 130 of the rear shell 100, and then the screen protective film 400 is covered on the mobile terminal 200. At this time, the screen protective film 400 is attached to the screen of the mobile terminal 200, and the sealing film 500 covers the front surface of the fastening groove 300. Then, the fastening portion 610 of the fastening piece 600 is used to push the sealing film 500 into the fastening groove 300, and the fastening portion 610 is snapped into the fastening groove 300. Since the side wall of the fastening groove 300 is elastic, the fastening portion 610 and the fastening groove 300 have an interference fit, so that the rear shell 100, the fastening piece 600 and the front cover form a sealed whole surrounding the mobile terminal 200, which has the functions of waterproof, dustproof and drop-proof, can well protect the mobile terminal 200, so that the mobile terminal 200 can adapt to external wind, rain, sand and dust, and the mobile terminal 200 can be carried for running, swimming and other sports.

[0035] The side wall of the snapping groove 300 is elastic, and the snapping part 610 is interference fit with the snapping groove 300, which is convenient for disassembly and assembly of the snapping part 600. The snapping part 610 and the inner wall of the snapping groove 300 clamp the sealing film 500, so a first seal is formed between the outer wall of the snapping part 610 and the inner wall of the snapping groove 300 away from the receiving groove 130, a second seal is formed between the inner wall of the snapping part 610 and one side surface (front surface) of the sealing film 500, and a third seal is formed between the other side surface (rear surface) of the sealing film 500 and the inner wall of the snapping groove 300 close to the receiving groove 130. If foreign matter such as water and dust want to enter the receiving groove 130 and corrode the mobile terminal 200, it is necessary to break through the first seal and the third seal at the same time, or break through the second seal and the third seal at the same time. In other words, the protective case has a double-layer sealing structure, which makes the sealing performance of the protective case more superior.

[0036] 3 and 7 , the screen protective film 400 and the sealing film 500 are connected as a whole, the buckling portion 610 and the inner wall of the buckling groove 300 clamp the sealing film 500, and the sealing film 500 is flexible. Even if the rear shell 100, the buckling groove 300 and the buckling portion 610 are slightly deformed due to being dropped or used for a long time, or there are certain errors in the size and flatness of the peripheral wall 120, the buckling portion 610 and the buckling groove 300, the rear shell 100, the buckling part 600 and the front cover can still be easily assembled, and the first seal, the second seal and the third seal will not fail, while ensuring that the screen protective film 400 is completely attached to the screen of the mobile terminal 200.

[0037] It can be understood that the peripheral wall 120 or the side wall of the snap-fitting groove 300 can be made of flexible or elastic material, and the side wall of the snap-fitting groove 300 can be slightly deformed, so that the snap-fitting part 610 can be inserted into and exited from the snap-fitting groove 300, which can further ensure the stability of the assembly and the convenience of disassembly of the rear shell 100, the snap-fitting part 600 and the front cover, and further ensure the effects of the first seal, the first seal and the third seal.

[0038] 2, 3, and 8, in some embodiments, the rear wall 110 and the peripheral wall 120 are integrally formed, facilitating the processing of the rear housing 100 and the engaging groove 300 while also improving processing efficiency and reducing the risk of cracks in the rear housing 100. A protrusion is provided on the outer edge of the rear surface of the rear wall 110 to support the rear housing 100, allowing the entire protective housing and the mobile terminal 200 therein to be placed upright. The protrusion also provides a non-slip effect.

[0039] Referring to Figure 4, in some embodiments, the snap-fitting groove 300 has a first inner side wall 310 and a second inner side wall 320, the second inner side wall 320 is arranged around the outside of the first inner side wall 310, the first inner side wall 310 is provided with a first barb portion 311, and the second inner side wall 320 is provided with a second barb portion 321, and the inner wall and outer wall of the snap-fitting portion 610 are respectively provided with a first hook portion 611 and a second hook portion 612, the first hook portion 611 is hooked on the first barb portion 311, and the second hook portion 612 is hooked on the second barb portion 321, so that the snap-fitting part 600 can be more stably stuck on the peripheral wall 120 and the rear shell 100, thereby preventing the snap-fitting part 600 from accidentally separating from the rear shell 100, thereby improving the drop resistance of the protective shell.

[0040] The fastening portion 610 is interference fit with the fastening groove 300, which serves to connect the fastening member 600 and the rear shell 100 together; the first hook portion 611 is hooked on the first barb portion 311, and the second hook portion 612 is hooked on the second barb portion 321, providing a safety for connecting the fastening member 600 and the rear shell 100 together, effectively preventing the fastening member 600 from accidentally withdrawing from the fastening groove 300.

[0041] The area of ​​the fastening portion 610 above the first hook 611 has an interference fit with the first inner sidewall 310, and the area of ​​the fastening portion 610 above the second hook 612 has an interference fit with the second inner sidewall 320, thereby effectively clamping the sealing film 500. The area of ​​the fastening portion 610 below the first hook 611 and the second hook 612 has a gap with the inner bottom wall of the fastening groove 300, ensuring that the fastening portion 610 can be inserted into the fastening groove 300 and maintain a good connection.

[0042] 4 , specifically, the first inner sidewall 310 includes a first inner upper surface, a first inner middle surface, and a first inner lower surface distributed in an upper, middle, and lower direction. The first inner upper surface and the vertical surface are parallel to each other, and the first inner upper surface and the first inner middle surface are perpendicular to each other. The structure of the second inner sidewall 320 is symmetrical to that of the first inner sidewall 310. The second inner sidewall 320 includes a second inner upper surface, a second inner middle surface, and a second inner lower surface distributed in an upper, middle, and lower direction. The spacing between the first inner upper surface and the second inner upper surface is smaller than the spacing between the first inner lower surface and the second inner lower surface. The first inner upper surface and the first inner middle surface form a first barb 311. The inner bottom of the engaging groove 300 is concavely arc-shaped, and the second inner upper surface and the second inner middle surface form a second barb 321. The outer shape of the engaging portion 610 matches the shape of the inner cavity of the engaging groove 300.

[0043] In some embodiments, the snap-fitting portion 610 is tough, so that the first hook portion 311 and the second hook portion 321 are tough. When the snap-fitting portion 610 is inserted into the snap-fitting groove 300, it is convenient for the first hook portion 611 to hook on the first hook portion 311 and the second hook portion 612 to hook on the second hook portion 321. When the snap-fitting portion 610 needs to exit the snap-fitting groove 300, the first hook portion 611 is disengaged from the first hook portion 311 and the second hook portion 612 is disengaged from the second hook portion 321.

[0044] 2 , 3 , and 5 , in some embodiments, the fastening member 600 further includes a main body and a stopper 620 . The main body matches the shape of the fastening member 610 . The upper end of the fastening member 610 is connected to the lower end of the main body, and the stopper 620 is connected to the inner wall of the main body. The provision of the main body enhances the overall structural strength of the fastening member 600 , preventing the entire fastening member 600 , the fastening member 610 , or the stopper 620 from breaking when the fastening member 600 is assembled or removed from the rear case 100 . The stopper 620 is configured to abut against the front surface of the screen protective film 400 . When the fastening member 610 is engaged with the fastening groove 300 , the stopper 620 abuts against the front surface of the screen protective film 400 , thereby preventing the screen protective film 400 and the mobile terminal 200 from falling off the rear case 100 .

[0045] It is understood that the front surface of the fastening member 600 is chamfered, that is, the thickness of the stopper 620 gradually increases from the inside to the outside, to prevent the stopper 620 from scratching the hand. Referring to Figures 2 and 8, the outer edge of the front surface of the peripheral wall 120 is provided with a flange 121, which surrounds the outside of the main body and serves to protect the screen of the mobile terminal 200.

[0046] In some embodiments, the main body, the fastening portion 610 and the blocking portion 620 are integrally formed, which not only facilitates the processing of the fastening component 600 but also improves the processing efficiency and reduces the risk of cracks and breakage of the fastening component 600.

[0047] Referring to FIG8 , in some embodiments, the rear housing 100 is provided with a charging port through-hole 124, and a plug 125 is connected to the peripheral wall 120. The plug 125 is used to seal the charging port through-hole 124. The charging port through-hole 124 allows the charging terminal of the charger to pass through, allowing the charging terminal to dock with the charging port of the mobile terminal 200. The mobile terminal 200 is connected to the charger, thereby allowing the charger to charge the mobile terminal 200. Since the mobile terminal 200 does not need to charge, the plug 125 is used to seal the charging port through-hole 124 to prevent debris such as water and dust from entering the storage slot 130 through the charging port through-hole 124.

[0048] The position of the charging port through hole 124 corresponds to the position of the charging port of the mobile terminal 200 and is determined by the position of the charging port of the mobile terminal 200. The charging port through hole 124 can be provided on the rear wall 110 or the peripheral wall 120.

[0049] In some embodiments, the plug 125 has an ear portion and a finger portion. The ear portion is connected to the rear housing 100 via a first fastener, allowing a person to easily grasp the finger portion, thereby facilitating removal of the plug 125 from the charging port through-hole 124. A first sealing ring is provided between the plug 125 and the sidewall of the charging port through-hole 124 to enhance the sealing effect of the charging port through-hole 124. The first fastener can be a first screw.

[0050] Referring to Figure 8, in some embodiments, a microphone through hole 122 is provided on the back shell 100, and the microphone through hole 122 is covered with a waterproof membrane 123. The waterproof membrane 123 has waterproof and dustproof functions, and the waterproof membrane 123 can allow sound to be transmitted from the outside of the protective shell into the storage groove 130, thereby ensuring the reception effect of the mobile terminal 200.

[0051] In some embodiments, the rear housing 100 is connected to a pressing block 128 via a second fastener. The pressing block 128 presses the waterproof membrane 123 onto the rear housing 100, so that the waterproof membrane 123 covers the microphone through hole 122. The pressing block 128 has a communication hole in the area corresponding to the microphone through hole 122, so that sound can sequentially pass through the communication hole, the waterproof membrane 123, and the microphone through hole 122. The second fastener can be a second screw.

[0052] The position of the microphone hole 122 corresponds to the position of the microphone of the mobile terminal 200 , and the position of the microphone hole 122 is determined by the specific position of the microphone of the mobile terminal 200 . The microphone hole 122 can be provided on the rear wall 110 or the peripheral wall 120 .

[0053] Referring to Figure 8, in some embodiments, a speaker through hole 126 is provided on the rear shell 100, and a slidable sealing plate 127 is provided on the peripheral wall 120. The sealing plate 127 is used to seal the speaker through hole 126. When waterproofing is required, the sealing plate 127 is slid so that the sealing plate 127 blocks and seals the speaker through hole 126, thereby preventing water, dust and other debris from entering the storage groove 130 through the speaker through hole 126.

[0054] The position of the microphone hole 122 corresponds to the position of the microphone of the mobile terminal 200 , and the position of the microphone hole 122 is determined by the specific position of the microphone of the mobile terminal 200 . The microphone hole 122 can be provided on the rear wall 110 or the peripheral wall 120 .

[0055] In some embodiments, a slide rail is provided on the inner wall of the speaker hole 126, and a slider that cooperates with the slide rail is connected to the sealing plate 127. A second sealing ring is provided between the sealing plate 127 and the speaker hole 126 to improve the sealing effect of the speaker hole 126.

[0056] It is understood that the back cover 100 has flexible button portions at positions corresponding to the buttons of the mobile terminal 200. By pressing the flexible button portions, the buttons of the mobile terminal 200 can be pressed. The back cover 100 has a transparent area at the position corresponding to the camera of the mobile terminal 200, so that the camera can shoot normally. The back cover 100 is provided with a connecting post for lanyard binding.

[0057] The mobile terminal 200 may be a rectangular mobile device, such as a mobile phone or a tablet. The sealing film 500 , the peripheral wall 120 , the fastening groove 300 , the fastening member 600 , the fastening portion 610 , the main body and the blocking portion 620 are all in a square frame shape.

[0058] Screen protector 400 can be a commonly available component on the market. Screen protector 400 is transparent and allows the touch screen of mobile terminal 200 to function normally. Sealing film 500 is in a circular shape. In a natural state, screen protector 400 and sealing film 500 unfold naturally.

[0059] 3 and 5 , in some embodiments, the periphery of the front surface of the screen protective film 400 or the periphery of the rear surface of the screen protective film 400 is connected to the sealing film 500 through the first adhesive layer 410 .

[0060] In some embodiments, the rear surface of the screen protection film 400 is provided with a second adhesive layer 420 for bonding with the screen of the mobile terminal 200. The second adhesive layer 420 can be an adsorption adhesive, such as AB adhesive.

[0061] In some embodiments, a waterproof label is provided on the inner wall of the rear shell 100. When the protective shell leaks, the waterproof label will change color when it comes into contact with water, thereby serving as a warning.

[0062] The technical features of the above embodiments can be assembled arbitrarily. In order to make the description concise, not all possible assemblies of the technical features in the above embodiments are described. However, as long as there is no contradiction in the assembly of these technical features, they should be considered to be within the scope of this specification.

[0063] Of course, the present invention is not limited to the above-mentioned embodiments. Those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A double-layer waterproof mobile terminal protective case with film, characterized in that: include: The rear housing includes a rear wall and a peripheral wall surrounding the rear wall, wherein the rear wall and the peripheral wall form a receiving slot for receiving the mobile terminal, and the front surface of the peripheral wall is provided with a snap-fitting slot surrounding the receiving slot, and the sidewall of the snap-fitting slot is elastic; The front cover includes a screen protective film and a sealing film, wherein the shape of the screen protective film matches the notch of the receiving slot, the sealing film is flexible, and the sealing film is sealed with the periphery of the screen protective film and extends around the screen protective film; The fastening part includes a fastening portion, the shape of the fastening portion matches the fastening groove, the fastening portion and the fastening groove are interference fit, and the fastening portion and the inner wall of the fastening groove clamp the sealing film to form a seal between the sealing film and the inner wall of the fastening groove, and the screen protective film can be attached to the screen of the mobile terminal.

2. The double-layer waterproof mobile terminal protective case according to claim 1, characterized in that: The snap-fitting groove has a first inner side wall and a second inner side wall, the second inner side wall is arranged around the outside of the first inner side wall, the first inner side wall is provided with a first barb portion, and the second inner side wall is provided with a second barb portion, and the inner wall and outer wall of the snap-fitting portion are respectively provided with a first hook portion and a second hook portion, the first hook portion is hooked on the first barb portion, and the second hook portion is hooked on the second barb portion.

3. The double-layer waterproof mobile terminal protective case according to claim 2, characterized in that: The buckling portion has toughness.

4. The double-layer waterproof mobile terminal protective case according to claim 1, characterized in that: The fastening part also includes a main body and a stopper, the outer shape of the main body matches the outer shape of the fastening part, the upper end of the fastening part is connected to the lower end of the main body, and the stopper is connected to the inner wall of the main body, and the stopper is used to rest on the front surface of the screen protective film.

5. The double-layer waterproof mobile terminal protective case according to claim 4, characterized in that: The main body, the buckling portion and the blocking portion are an integrally formed structure.

6. The double-layer waterproof mobile terminal protective case according to claim 1, characterized in that: The rear shell is provided with a charging port through hole, and the peripheral wall is connected with a plug, which is used to seal the charging port through hole.

7. The double-layer waterproof mobile terminal protective case according to claim 1, characterized in that: A microphone through hole is provided on the rear shell, and the microphone through hole is covered with a waterproof film.

8. The double-layer waterproof mobile terminal protective case according to claim 1 or 7, characterized in that: The rear shell is provided with a speaker through hole, and the peripheral wall is provided with a slidable sealing plate, and the sealing plate is used for sealing the speaker through hole.

9. The double-layer waterproof mobile terminal protective case according to claim 1, characterized in that: The periphery of the front surface of the screen protective film or the periphery of the rear surface of the screen protective film is connected to the sealing film through the first adhesive layer.

10. The double-layer waterproof mobile terminal protective case according to claim 1 or 9, characterized in that: The rear surface of the screen protection film is provided with a second adhesive layer for laminating to the screen of the mobile terminal.

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