A cup cover with automatic air outlet device

Abstract

The utility model discloses a cup cover with automatic air outlet device, including the cover, be equipped with the recessed installation groove on the cover, be equipped with with drinking water mouth and air outlet hole in the installation groove, be equipped with the plugging piece and the reset spring that provides to the plugging piece upward elastic force in the air outlet hole, the plugging piece includes the connecting column of slidingly being equipped in the air outlet hole and the sealing cover of being sleeved on the connecting column, the outer contour of sealing cover is the circular truncated cone structure of gradually reducing outside diameter, the inner wall of air outlet hole is the circular truncated plane that matches with the outer contour of sealing cover, and the connecting column lower section lateral wall has the air outlet channel that passes through the bottom end, is rotatably connected with the flap that will close drinking water mouth in the installation groove, and the flap bottom surface is equipped with the abutting portion, and the flap covers drinking water mouth and abuts portion is pressed tightly plugging piece downward, and plugging piece slides down and passes through the air outlet channel plugging of the inclined surface cooperation of circular truncated plane and sealing cover. Compared with prior art, the utility model has the advantages that when the flap closes, the circular truncated cone sealing cover and air outlet hole circular truncated plane inclined surface are pressed tightly by abutting portion pressing plugging piece down, and 360 degree surface contact seal is formed, and the gas exchange channel in cup body is cut off completely.

Description

Technical Field

[0001] This utility model relates to the field of thermos cup technology, and in particular to a cup lid with an automatic venting device. Background Technology

[0002] As a common household item, one of the core functions of a thermos flask is to maintain the temperature of liquids for extended periods. To achieve good insulation, the flask body typically employs a double-walled vacuum structure and is equipped with a sealing lid to prevent heat loss. However, in actual use, when the flask contains hot water, the internal air expands due to heat. If this expansion cannot be released in time, the internal pressure will rise, potentially causing hot water to splash or making the lid difficult to open, posing safety hazards. Therefore, a well-designed vent structure to balance the internal and external pressure of the flask is a key design element for ensuring the safe and convenient use of a thermos flask.

[0003] As disclosed in patent document CN221931724U, a self-locking cup lid and water storage container have a vent in their structure to release the internal air pressure before the lid is opened, preventing hot water from spraying out. This structure includes a sealing lid, a suction nozzle, a pressure relief hole, and a cover on the upper lid. Specifically, the suction nozzle is embedded in a mounting hole at the bottom of the sealing lid, the pressure relief hole is inserted into the vent of the sealing lid, and the upper lid has a cover with an open bottom to cover the pressure relief hole when the lid is closed, thereby achieving closure of the pressure relief hole. This design achieves air pressure regulation to a certain extent, improving safety during use.

[0004] However, the aforementioned existing technologies still suffer from insufficient heat preservation performance. Because the cover merely covers the pressure relief hole, and its lower end is open and does not form an effective seal with the sealing cap, heat inside the cup can still escape through the gap between the cover and the sealing cap, creating a heat loss channel. Furthermore, the pressure relief hole remains semi-closed for extended periods, failing to completely prevent gas exchange between the inside and outside, further reducing the heat preservation effect of the thermos. Utility Model Content

[0005] This invention addresses the problem that existing thermos cup lids, where the pressure relief hole (vent) is covered by a cover, resulting in an open lower end and no effective seal between the cover and the pressure relief hole, leading to insufficient heat preservation performance. The technical problem this invention aims to solve is to provide a cup lid with an automatic venting device to address the aforementioned issue.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: It includes a cover body, on which a recessed mounting groove is provided. The mounting groove contains a drinking spout and a vent hole. The drinking spout is located at the edge of the mounting groove near the cover body. The vent hole contains a sealing element and a return spring that provides upward elastic force to the sealing element. The sealing element includes a connecting post slidably disposed within the vent hole and a sealing sleeve fitted onto the connecting post. The outer contour of the sealing sleeve is a frustum-shaped structure with a gradually decreasing outer diameter. The inner wall of the vent hole is a sealing... The outer contour of the sleeve is matched with a truncated cone surface. The lower section of the connecting column has an air outlet channel that extends through the bottom end. A flip cover that closes the drinking spout is rotatably connected in the mounting groove. The bottom surface of the flip cover has a backing part. When the flip cover closes the drinking spout, the backing part presses down to seal the sealing member. The sealing member slides down and seals the air outlet channel by cooperating with the inclined surface of the truncated cone surface and the sealing sleeve. When the flip cover is opened, the sealing member automatically resets under the action of the return spring. An air inlet gap is formed between the truncated cone surface and the inclined surface of the sealing sleeve. The air outlet channel slides to the truncated cone surface and connects with the air inlet gap.

[0007] A further preferred embodiment of this utility model is as follows: a round cover is fixedly connected to the top of the connecting column, the center of the round cover falls on the axis of the connecting column, the vent includes an upward-opening mounting cylinder and a tube body coaxial with the mounting cylinder, the frustum is located in the upper half of the inner wall of the tube body, the connecting column is slidably disposed in the tube body, an annular groove is formed between the tube body and the mounting cylinder, the return spring is sleeved on the outer periphery of the tube body and located in the annular groove, and the upper and lower ends of the return spring abut against the bottom surface of the round cover and the bottom of the annular groove, respectively.

[0008] A further preferred embodiment of this utility model is: the connection between the connecting column and the round cover has an annular groove recessed into the connecting column, and the sealing sleeve is fitted into the annular groove and has an interference fit with the annular groove.

[0009] A further preferred embodiment of this utility model is that the diameter of the section of the connecting column located below the annular groove is equal to the inner diameter of the straight section below the frustum of the tube.

[0010] A further preferred embodiment of this utility model is that the diameter of the round cover is equal to or greater than the outer diameter of the tube body and less than the inner diameter of the mounting cylinder.

[0011] A further preferred embodiment of this utility model is as follows: the two side walls between the two ends of the flip cover are rotatably connected to the two inner side walls of the mounting groove via a pivot, so that the flip cover forms a lever structure with the pivot as the rotation center. One end of the flip cover has a sealing head that closes the drinking spout, and the other end is tilted upward to form an operating part. The flip cover has a U-shaped groove with the opening facing downward. The U-shaped groove is set along the pivot towards the sealing part. A spring and a locking tongue assembly are provided in the U-shaped groove. The locking tongue assembly can slide along the U-shaped groove. The spring always provides elastic force to the locking tongue assembly in the direction away from the latch. A latch is provided in the mounting groove between the drinking spout and the air vent and cooperates with the locking tongue assembly. A driving component is also slidably provided in the mounting groove for pushing the locking tongue assembly to slide and cooperate with the latch to lock the flip cover.

[0012] A further preferred embodiment of this utility model is as follows: symmetrical slide rails are provided on both sides of the U-shaped groove. The slide rails gradually slope upward from the pivot point toward the sealing part. The latch assembly includes a latch and a frame with a mounting position in the middle. A positioning post is provided on the side of the mounting position near the latch. Slider blocks that can slide along the slide rails are provided on both outer sides of the frame. The lower end of the abutment extends into the mounting position. One spring is located in the mounting position, with one end abutting against the abutment and the other end sleeved on the positioning post, always providing elastic force to the frame away from the latch.

[0013] A further preferred embodiment of this utility model is: the mounting groove has a slot penetrating the side wall of the cup lid on the side away from the drinking spout, the driving component is located at the slot of the mounting groove, and its outer end fills the slot. The two side walls of the drive component are provided with guide grooves arranged along its sliding direction. The groove wall of the mounting groove is provided with strip-shaped protrusions extending into the guide grooves. The bottom surface of the operating part is a first inclined surface that slopes downward toward the connecting shaft. The front end of the drive component abuts against the rear end of the frame. The top surface of the front end of the drive component is a second inclined surface that cooperates with the first inclined surface.

[0014] A further preferred embodiment of this utility model is as follows: the mounting groove is provided with an elastic protrusion corresponding to the position of the driving component, and the driving component has a limiting groove one and a limiting groove two. When the driving component slides to the point where the elastic protrusion is located in the limiting groove one, the locking tongue assembly cooperates with the latch to lock the flip cover; when the driving component slides to the point where the elastic protrusion is located in the limiting groove two, the locking tongue assembly disengages from the latch.

[0015] A further preferred embodiment of this utility model is: the elastic protrusion is located at the bottom of the mounting groove, and the first limiting groove and the second limiting groove are located at the bottom of the driving component.

[0016] Compared with the prior art, this utility model has the following advantages: by sliding a sealing component and a return spring inside the vent, and by providing a pressing part on the flip cover to press the sealing component, when the flip cover is closed, the pressing part presses down on the sealing component, causing the frustum-shaped sealing sleeve to fit and press against the inclined surface of the frustum of the vent, forming a 360° surface contact seal, completely cutting off the gas exchange channel between the inside and outside of the cup, and solving the problem of insufficient heat preservation performance caused by the heat loss channel formed by the gap between the cover and the sealing cap in the prior art. Attached Figure Description

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be regarded as a limitation on the scope of the present invention. In addition, unless otherwise specified, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0018] Figure 1 This is a three-dimensional structural diagram of a preferred embodiment of the present invention; Figure 2 This is a top view of a preferred embodiment of the present invention; Figure 3 This is a preferred embodiment of the present utility model. Figure 2 Sectional view at point AA; Figure 4 This is a preferred embodiment of the present utility model. Figure 3 A magnified view of a section at point B in the middle; Figure 5 This is a three-dimensional structural diagram of the cover body according to a preferred embodiment of the present utility model; Figure 6 This is a three-dimensional structural diagram of the bottom of the flip cover in a preferred embodiment of the present invention; Figure 7 This is an exploded view of a preferred embodiment of the present invention.

[0019] In the diagram: 1. Cover; 2. Mounting groove; 21. Groove opening; 22. Strip-shaped protrusion; 23. Elastic protrusion; 24. Lock; 3. Drinking spout; 4. Air outlet; 41. Mounting cylinder; 42. Pipe body; 421. Frustum; 43. Annular groove; 5. Sealing component; 51. Connecting post; 511. Air outlet channel; 512. Round cover; 513. Annular groove; 52. Sealing sleeve; 6. Return spring; 7. Flip cover ; 71. Abutment part; 72. Rotating shaft; 73. Sealing head; 74. Operating part; 75. U-shaped groove; 76. Slide rail; 77. First inclined surface; 8. Spring one; 9. Locking tongue assembly; 91. Locking tongue; 92. Frame; 921. Slider; 922. Positioning post; 923. Mounting position; 10. Driving component; 101. Guide groove; 102. Second inclined surface; 103. Limiting groove one; 104. Limiting groove two. Detailed Implementation

[0020] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0021] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it may not be further defined and explained in subsequent figures.

[0022] This embodiment mainly describes a cup lid with an automatic venting device, as detailed below: like Figures 1 to 7As shown, the cup includes a lid 1, with a recessed mounting groove 2 on the top surface of the lid 1. The mounting groove 2 contains a drinking spout 3 and a vent 4. The drinking spout 3 is located near the edge of the lid 1 in the mounting groove 2, allowing users to drink directly from the spout. The vent 4 contains a sealing element 5 and a return spring 6. The sealing element 5 is used to seal the vent 4 to achieve a seal on the cup. The return spring 6 always applies an upward pushing force to the sealing element 5. The sealing element 5 consists of a connecting post 51 and a sealing sleeve 52 fitted on the connecting post 51. The outer contour of the sealing sleeve 52 is a frustum-shaped structure with a gradually decreasing outer diameter, forming a frustum shape that is larger at the top and smaller at the bottom. The inner wall of the vent 4 is correspondingly set as a frustum surface 421 that matches the outer contour of the sealing sleeve 52. The lower side wall of the connecting post 51 has a venting channel 511 that extends through the bottom. The mounting slot 2 is rotatably connected to a flip cover 7 that seals the drinking spout 3. The bottom surface of the flip cover 7 is provided with abutment part 71. When the flip cover 7 is pressed down to seal the drinking spout 3, the abutment part 71 presses down on the sealing member 5, the return spring 6 is compressed, and the truncated surface of the sealing sleeve 52 fits and presses tightly with the inclined surface of the truncated surface of the air outlet 4 to form a surface contact seal, blocking the exchange of gas inside and outside the cup. When the flip cover 7 is opened, the return spring 6 pushes the sealing member 5 to move upward and reset, the sealing sleeve 52 disengages from the truncated surface to create an annular air inlet gap, and the air outlet channel 511 slides to the truncated surface and connects with the gap, so that the expanded gas inside the cup is discharged instantly, avoiding hot water splashing. At the same time, the structure is simple, the response is fast, and it can take into account both heat preservation and pressure relief without additional operation.

[0023] like Figure 7 As shown, a round cover 512 is fixedly connected to the top of the connecting post 51, and the center of the round cover 512 falls on the axis of the connecting post 51. The vent 4 is composed of a coaxial mounting cylinder 41 and a tube 42. The opening of the mounting cylinder 41 faces upward, and the upper half of the inner wall of the tube 42 is the aforementioned frustum 421. The connecting post 51 is slidably disposed inside the tube 42, and an annular groove 43 is formed between the tube 42 and the mounting cylinder 41. The return spring 6 is sleeved on the outside of the tube 42 and located inside the annular groove 43. The upper and lower ends of the return spring 6 abut against the bottom surface of the round cover 512 and the bottom of the annular groove 43, respectively. The round cover 512 serves as both a support for the spring and a shield for the upper opening of the tube 42, preventing dust from entering. The annular groove 43 isolates the spring from the drinking water area, preventing rust and water contamination. The outer diameter of the round cover 512 is larger than the outer diameter of the tube 42, which can completely cover the upper opening of the tube 42, further reducing heat convection loss and improving the heat preservation effect.

[0024] Specifically, the connection between the connecting post 51 and the round cover 512 is provided with an annular groove 513 recessed into the post, and the sealing sleeve 52 is fitted into the annular groove 513 with an interference fit. This structure makes the sealing sleeve 52 less prone to loosening after installation, and it can maintain a stable position even under long-term inversion or severe vibration. When the frustum-shaped sealing sleeve 52 is compressed, it deforms evenly along the inclined surface to form a 360° continuous sealing band. Compared with the traditional O-ring line seal, the stress distribution is more uniform and the seal is more reliable. Moreover, it still has the self-compensation ability of the inclined surface after wear, thus extending its service life.

[0025] Specifically, the diameter of a section of the connecting column 51 located below the annular groove 513 is equal to the inner diameter of the straight section below the frustum of the tube 42. This section of the column forms a sliding guide pair with the tube 42. The length of the guide section is greater than the height of the sealing sleeve 52, ensuring that the sealing component 5 remains coaxial when moving up and down, preventing swaying that could cause local wear or jamming of the sealing sleeve 52. Each time the flip cover 7 is pressed down, the sealing sleeve 52 can accurately align with the frustum 421, maintaining a stable sealing force, while reducing opening and closing resistance and improving operational smoothness. At the same time, when the flip cover 7 is closed, the opening of the air outlet channel 511 is located below the frustum 421 and is covered by the inner wall of the tube 42, further improving the heat preservation performance of the cup.

[0026] Specifically, the diameter of the round cover 512 is equal to or slightly larger than the outer diameter of the tube 42 and smaller than the inner diameter of the mounting cylinder 41, thus forming a labyrinthine annular gap between the round cover 512 and the mounting cylinder 41. When the flip cover 7 is closed, this annular gap constitutes a "secondary throttling" channel, requiring hot air to pass through two folds before escaping, significantly reducing the thermal convection velocity; the round cover 512 also prevents direct hand contact with the metal tube 42, serving as a burn prevention measure. After the flip cover 7 is opened, the round cover 512 rises with the sealing component 5, and the annular gap expands instantaneously, providing sufficient flow area for rapid exhaust, thus meeting both heat preservation and pressure relief requirements.

[0027] Specifically, the two side walls between the two ends of the flip cover 7 are rotatably connected to the two inner side walls of the mounting groove 2 via a pivot 72, forming a lever structure with the pivot 72 as the rotation center. One end of the flip cover 7 is provided with a sealing head 73 corresponding to the drinking port 3 to seal the drinking port 3, and the other end is tilted upward to form an operating part 74. The flip cover 7 has a U-shaped groove 75 with its opening facing downward. The U-shaped groove 75 is set along the pivot 72 towards the sealing head 73. A spring 8 and a locking tongue assembly 9 are provided in the U-shaped groove 75. The locking tongue assembly 9 is set along the length of the mounting groove 2 and can slide along the U-shaped groove 75. The spring 8 always provides elastic force to the locking tongue assembly 9 in the direction away from the latch 24. The mounting groove 2 is provided with a latch 24 located between the drinking port 3 and the air vent 4. The latch 24 matches the locking tongue assembly 9. A driving member 10 is also slidably provided in the mounting groove 2. The driving member 10 is used to push the locking tongue assembly 9 to cooperate with the latch 24 to lock the flip cover 7 and prevent accidental opening of the drinking port 3. After the flip cover 7 is flipped downwards, the drive component 10 pushes the locking tongue assembly 9 forward to engage with the latch 24, locking the flip cover 7 and simultaneously pressing and sealing the vent 4. After the drive component 10 slides in the opposite direction, the locking tongue assembly 9 slides away from the latch 24 under the action of the spring 8, causing the locking tongue assembly 9 to disengage from the latch 24. At this time, under the action of the return spring 6, the sealing component 5 bounces upwards along the tube body 42, and at the same time, the sealing component 5 acts on the abutment part 71, causing the flip cover 7 to automatically bounce up. The vent 4 releases pressure first, and the drinking spout 3 opens later. The sequence of actions is reasonable, avoiding hot water splashing and achieving safe and convenient operation.

[0028] like Figure 6 As shown, symmetrical slide rails 76 are provided on both sides of the U-shaped groove 75. The slide rails 76 gradually tilt upwards from the rotation axis 72 toward the sealing head 73. The locking tongue assembly 9 includes a locking tongue 91 and a frame 92 with a mounting position 923 in the middle. A positioning post 922 is provided on the side of the mounting position 923 near the locking tongue 91. Sliding blocks 921 that can slide along the slide rails 76 are provided on both outer sides of the frame 92. The lower end of the abutment part 71 extends into the mounting position 923. Spring 8 is located in the mounting position 923, with one end abutting against the abutment part 71 and the other end sleeved on the positioning post 922, and always providing elastic force to the frame 92 away from the latch 24. This structure tilts the slide rails 76 upwards, which makes it convenient for the locking tongue assembly 9 to press the flip cover 7 against the drinking mouth 3 and the sealing part 5 during the sliding process toward the latch 24, further improving the sealing performance of the cup body when sealing the drinking mouth 3 and the vent 4.

[0029] Specifically, the mounting groove 2 has a slot 21 that penetrates the side wall of the cover 1 on the side away from the drinking port 3. The drive member 10 is placed in the slot 21 and its outer end face fills the slot 21 to maintain a neat appearance. The two side walls of the drive member 10 are provided with guide grooves 101 that extend in the sliding direction. The groove wall of the mounting groove 2 is provided with strip-shaped protrusions 22 that extend into the guide grooves 101 to form a linear sliding pair to prevent the drive member 10 from deflecting. The bottom surface of the operating part 74 is a first inclined surface 77 that slopes downward toward the rotating shaft 72. The top surface of the front end of the drive member 10 is a second inclined surface 102 that cooperates with the first inclined surface 77. When the drive member 10 is pushed to slide, the second inclined surface 102 squeezes the first inclined surface 77, causing one end of the sealing head 73 of the flip cover 7 to move downward, thereby pressing and sealing the drinking port 3.

[0030] like Figure 5 As shown, the mounting groove 2 is provided with elastic protrusions 23, which are located on both sides of the mounting groove 2. The driving component 10 is provided with corresponding limiting grooves 103 and 104 on both sides, or the elastic protrusions 23 are located at the bottom of the mounting groove 2, and the bottom of the driving component 10 is provided with corresponding limiting grooves 103 and 104. When the driving component 10 is pushed until the elastic protrusions 23 are engaged in the first limiting groove 103, the locking tongue assembly 9 is firmly engaged with the latch 24, and the flip cover 7 is in a locked state. The elastic protrusions 23 provide a clear tactile feel and a "click" prompt. When the driving component 10 is pushed in the opposite direction until the elastic protrusions 23 slide into the second limiting groove 104, the locking tongue assembly 9 is completely disengaged from the latch 24, and the flip cover 7 can rotate freely. This double limiting structure enables the cup lid to have a self-holding function, which can maintain the locked or unlocked state without continuous force. The entire process of opening, closing, and locking can be completed with one hand, which significantly improves the convenience and user experience. The elastic protrusion 23 mentioned above can be a rib or an elastic pin.

[0031] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] The above provides a detailed description of a cup lid with an automatic venting device provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand this utility model and its core ideas. 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 principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A cup lid with an automatic venting device, comprising a lid body, wherein the lid body has a recessed mounting groove, the mounting groove having a drinking spout and a vent hole, the drinking spout being located at the edge of the mounting groove near the lid body, characterized in that: The vent is equipped with a sealing element and a return spring that provides upward elastic force to the sealing element. The sealing element includes a connecting post slidably disposed in the vent and a sealing sleeve fitted on the connecting post. The outer contour of the sealing sleeve is a frustum-shaped structure with a gradually decreasing outer diameter. The inner wall of the vent is a frustum-shaped surface that matches the outer contour of the sealing sleeve. The lower side wall of the connecting post has an venting channel that extends through the bottom end. A flip cover that closes the drinking spout is rotatably connected in the mounting groove. The bottom surface of the flip cover has an abutment part. When the flip cover closes the drinking spout, the abutment part presses down on the sealing element. The sealing element slides down and seals the venting channel by engaging the frustum-shaped surface with the inclined surface of the sealing sleeve. When the flip cover is opened, the sealing element automatically resets under the action of the return spring. An air inlet gap is formed between the frustum-shaped surface and the inclined surface of the sealing sleeve. The venting channel slides to the frustum-shaped surface and connects with the air inlet gap.

2. A cup lid with an automatic venting device according to claim 1, characterized in that: A circular cap is fixedly connected to the top of the connecting column, and the center of the circular cap falls on the axis of the connecting column. The vent includes an upward-opening mounting cylinder and a tube body coaxial with the mounting cylinder. The frustum is located in the upper half of the inner wall of the tube body. The connecting column is slidably disposed in the tube body. An annular groove is formed between the tube body and the mounting cylinder. The return spring is sleeved on the outer periphery of the tube body and located in the annular groove. The upper and lower ends of the return spring abut against the bottom surface of the circular cap and the bottom of the annular groove, respectively.

3. A cup lid with an automatic venting device according to claim 2, characterized in that: The connection between the connecting column and the round cover has an annular groove that is recessed into the connecting column, and the sealing sleeve is fitted into the annular groove with an interference fit.

4. A cup lid with an automatic venting device according to claim 3, characterized in that: The diameter of the section of the connecting column located below the annular groove is equal to the inner diameter of the straight section below the frustum of the tube.

5. A cup lid with an automatic venting device according to claim 2, characterized in that: The diameter of the round cap is equal to or greater than the outer diameter of the tube body and less than the inner diameter of the mounting cylinder.

6. A cup lid with an automatic venting device according to claim 1, characterized in that: The two side walls between the two ends of the flip cover are rotatably connected to the two inner side walls of the mounting groove via a pivot, so that the flip cover forms a lever structure with the pivot as the center of rotation. One end of the flip cover has a sealing head that closes the drinking spout, and the other end is upturned to form an operating part. The flip cover has a U-shaped groove with the opening facing downward. The U-shaped groove is set along the pivot towards the sealing part. A spring and a locking tongue assembly are provided in the U-shaped groove. The locking tongue assembly can slide along the U-shaped groove. The spring always provides elastic force to the locking tongue assembly in the direction away from the latch. A latch is provided in the mounting groove between the drinking spout and the air vent and cooperates with the locking tongue assembly. A drive component is also slidably provided in the mounting groove to push the locking tongue assembly to slide and cooperate with the latch to lock the flip cover.

7. A cup lid with an automatic venting device according to claim 6, characterized in that: The U-shaped groove has symmetrical slide rails on both sides of the groove wall. The slide rails gradually slope upward from the pivot point towards the sealing part. The latch assembly includes a latch and a frame with a mounting position in the middle. The mounting position has a positioning post on the side near the latch. The two outer sides of the frame have sliders that can slide along the slide rail. The lower end of the abutment extends into the mounting position. The spring is located in the mounting position, with one end abutting against the abutment and the other end sleeved on the positioning post, and always providing elastic force to the frame away from the latch.

8. A cup lid with an automatic venting device according to claim 6, characterized in that: The mounting groove has a slot that penetrates the side wall of the cup lid on the side away from the drinking spout. The driving component is located at the slot of the mounting groove, and its outer end fills the slot. The two side walls of the drive component are provided with guide grooves arranged along its sliding direction. The groove wall of the mounting groove is provided with strip-shaped protrusions extending into the guide grooves. The bottom surface of the operating part is a first inclined surface that slopes downward toward the connecting shaft. The front end of the drive component abuts against the rear end of the frame. The top surface of the front end of the drive component is a second inclined surface that cooperates with the first inclined surface.

9. A cup lid with an automatic venting device according to claim 6, characterized in that: The mounting groove is provided with an elastic protrusion corresponding to the position of the driving component. The driving component has a limiting groove one and a limiting groove two. When the driving component slides to the point where the elastic protrusion is located in the limiting groove one, the locking tongue assembly cooperates with the latch to lock the flip cover. When the driving component slides to the point where the elastic protrusion is located in the limiting groove two, the locking tongue assembly disengages from the latch.

10. A cup lid with an automatic venting device according to claim 9, characterized in that: The elastic protrusion is located at the bottom of the mounting groove, and the first limiting groove and the second limiting groove are located at the bottom of the driving component.

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