A pressure relief cap and a container with liquid heating function

Abstract

A pressure relief cover comprises an outer cylinder, a fixed inner cover, a movable outer cover, a pressure relief valve body and an elastic pressing fastener. The side edge of the fixed inner cover is fixedly connected with the inner side wall of the outer cylinder. The movable outer cover is connected with the fixed inner cover through the elastic pressing fastener, so that it can reciprocate along the direction of approaching and moving away from the fixed inner cover and is kept stable at the locking position. The side edge of the movable outer cover is spaced apart from the inner side wall of the outer cylinder. The end face of the fixed inner cover is provided with a pressure relief through hole communicating with the outside. The upper end of the pressure relief valve body is fixedly connected with the movable outer cover, and the lower end thereof is opposite to the pressure relief hole. When the movable outer cover moves towards the fixed inner cover, the lower end of the pressure relief valve body blocks the pressure relief hole. When the movable outer cover moves away from the fixed inner cover, the blocking of the pressure relief hole is removed.

Description

Technical Field

[0001] The present invention relates to the field of small household electrical appliances, and in particular to a pressure relief cover and a container with a liquid heating function. Background Art

[0002] The existing electric water cup usually includes a cup body and a cup cover. A heating device is provided at the bottom of the cup body. When in use, the heating device can be connected to a power source to heat the water in the cup body.

[0003] Since steam will generate pressure when boiling water, there is a safety hazard. Therefore, most of the current electric water cups cannot boil water. Although some low-voltage electric water cups can boil water, they cannot be sealed to release pressure, and will leak when carried, which is very inconvenient to use.

[0004] In the prior art, an elastic member is generally used to sense the pressure in the cup when boiling water, and when the pressure is too high, the elastic member is elastically deformed and automatically releases the pressure, which cannot be manually controlled. Summary of the Invention

[0005] The main purpose of the present invention is to provide a pressure relief cover and a container with a liquid heating function, wherein a user can open the pressure relief channel by himself to relieve the pressure of the expanded gas in the container.

[0006] To achieve the above-mentioned purpose, the present invention proposes a pressure relief cover, comprising an outer cylinder, a fixed inner cover, a movable outer cover, a pressure relief valve body and an elastic pressing fastener;

[0007] The side edge of the fixed inner cover is fixedly connected to the inner side wall of the outer cylinder;

[0008] The movable outer cover is connected to the fixed inner cover via an elastic pressing member, so that it can reciprocate in a direction close to and away from the fixed inner cover and remain stable in a locked position; a gap is provided between the side edge of the movable outer cover and the inner side wall of the outer cylinder;

[0009] The end surface of the fixed inner cover is provided with a pressure relief through hole connected to the outside world. The upper end of the pressure relief valve body is fixedly connected to the movable outer cover, and the lower end thereof faces the pressure relief through hole. When the movable outer cover moves toward the fixed inner cover, the lower end of the pressure relief valve body blocks the pressure relief through hole; when the movable outer cover moves away from the fixed inner cover, the blockage of the pressure relief through hole is released.

[0010] Preferably, the movable outer cover is a T-shaped structural member consisting of a transverse cover portion and a longitudinal cylinder portion, a gap is provided between the side edge of the transverse cover portion and the inner side wall of the outer cylinder, and a gap is provided between the bottom end surface of the longitudinal cylinder portion and the end surface of the fixed inner cover;

[0011] The pressure relief through hole is located in the space surrounded by the longitudinal cylindrical portion.

[0012] Preferably, an abutting elastic member is provided between the fixed inner cover and the movable outer cover, and when the movable outer cover moves in a direction approaching the fixed inner cover, the abutting elastic member is compressed.

[0013] Preferably, the fixed inner cover comprises a cylindrical portion and an annular edge, and the inner edge of the annular edge is fixedly connected to the upper edge of the cylindrical portion;

[0014] The pressure relief through hole is arranged on the bottom wall surface of the cylindrical portion;

[0015] The longitudinal cylindrical portion is accommodated in the cylindrical body portion, and a distance is provided between the outer wall surface of the longitudinal cylindrical portion and the inner wall surface of the cylindrical body portion; a distance is provided between the bottom end surface of the longitudinal cylindrical portion and the bottom wall surface of the cylindrical body portion.

[0016] Preferably, the outer wall surface of the longitudinal cylindrical portion is provided with an anti-slip lower edge, one end of the anti-slip lower edge is fixed to the outer side wall of the longitudinal cylindrical portion, and the other end extends toward the inner wall surface of the cylindrical portion; a distance is provided between the free end of the anti-slip lower edge and the inner wall surface of the cylindrical portion;

[0017] The inner wall surface of the cylindrical portion is provided with an anti-slip upper edge, one end of the anti-slip upper edge is fixed to the inner wall surface of the cylindrical portion, and the other end extends toward the outer side wall of the longitudinal cylindrical portion;

[0018] The anti-slip upper edge corresponds to the upper side of the anti-slip lower edge, and the two at least partially overlap in the vertical space.

[0019] Preferably, the inner wall surface of the cylindrical portion is provided with an inwardly protruding guide ridge, and the outer wall surface of the longitudinal cylindrical portion is provided with a guide notch that is adaptively engaged with the guide ridge.

[0020] Preferably, the pressure relief valve body includes a valve cylinder, a pressure relief spring, a valve head stem and a plug capable of completely blocking the pressure relief through hole;

[0021] The upper end of the valve cylinder is fixed to the inner end surface of the movable outer cover, the pressure relief spring is arranged in the internal cavity of the valve cylinder, and the upper end of the valve head rod is arranged in the valve cylinder and abuts against the pressure relief spring; the upper end of the valve head rod can reciprocate linearly along the axial direction of the valve cylinder;

[0022] The plug is arranged at the lower end of the valve head rod.

[0023] Preferably, the lower outer side wall of the plug is conical, and the valve head rod is fixed in the middle thereof.

[0024] Preferably, the elastic pressing fastener is an elastic self-locking device, the main body of the elastic self-locking device is fixed to the fixed inner cover, and the male head thereof is fixed to the movable outer cover.

[0025] A container with a liquid heating function comprises a container body, a heating component and the above-mentioned pressure relief cover, wherein the container body has an inner cavity for holding liquid, the heating component is installed in the container, and the pressure relief cover is detachably fastened to the container body.

[0026] During use of the technical solution of the present invention, by pressing downward (manually), the elastic pressing fastener is forced to drive the movable outer cover to move in the direction close to the fixed inner cover. At the same time, the pressure relief valve body moves along with the movable outer cover in the direction close to the fixed inner cover. The elastic pressing fastener drives the movable outer cover to move downward a distance that just allows the lower end of the pressure relief valve body to block the pressure relief through hole, and the movable outer cover can just remain stable in the locked position. At this time, the pressure relief cover is in a non-pressure relief state.

[0027] Press the elastic pressing fastener again, and the elastic pressing fastener is driven by force to drive the movable outer cover to move in the direction away from the fixed inner cover. At the same time, the pressure relief valve body moves along with the movable outer cover in the direction away from the fixed inner cover, so that the lower end of the pressure relief valve body leaves the position of blocking the pressure relief through hole, and the pressure relief through hole is in a state of communication with the outside world. The gas inside the pressure relief cover can enter the outer cylinder of the pressure relief cover through the pressure relief through hole, and then be discharged to the outside of the pressure relief cover through the gap between the side edge of the movable outer cover and the inner wall of the outer cylinder. At this time, the pressure relief cover is in the pressure relief working state. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0029] Figure 1 is a cross-sectional view of an embodiment of a pressure relief cover of the present invention;

[0030] Figure 2 This is a structural diagram of an embodiment of a fixed inner cover;

[0031] Figure 3 It is a structural schematic diagram of an embodiment of a movable outer cover;

[0032] Figure 4 This is a cross-sectional view of an embodiment of a container with a liquid heating function according to the present invention.

[0033] Description of Figure Numbers:

[0034] outer cylinder 1;

[0035] Fixed inner cover 2, pressure relief hole 21, cylindrical body 22, annular edge 23, anti-slip upper edge 24, guide rib 25;

[0036] Movable outer cover 3, transverse cover portion 31, longitudinal tube portion 32, anti-drop edge 33, guide notch 34;

[0037] Pressure relief valve body 4, valve cylinder 41, pressure relief spring 42, valve head rod 43, plug 44;

[0038] Elastic pressing fastener 5, main body 51, male head 52;

[0039] Abutting elastic member 6 and container body 7.

[0040] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0042] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0043] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions. Taking "A and / or B as an example", it includes solution A, or solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0044] The present invention provides a pressure relief cover, such as Figure 1 、 Figure 2 and Figure 3 As shown, it includes an outer tube 1, a fixed inner cover 2, a movable outer cover 3, a pressure relief valve body 4 and an elastic pressing fastener 5;

[0045] The side edge of the fixed inner cover 2 is fixedly connected to the inner wall of the outer cylinder 1;

[0046] The movable outer cover 3 is connected to the fixed inner cover 2 by an elastic pressing fastener 5, so that it can reciprocate in the direction of approaching and moving away from the fixed inner cover 2 and remain stable in the locked position; a gap is provided between the side edge of the movable outer cover 3 and the inner side wall of the outer cylinder 1;

[0047] The end face of the fixed inner cover 2 is provided with a pressure relief hole 21 connected to the outside world. The upper end of the pressure relief valve body 4 is fixedly connected to the movable outer cover 3, and the lower end thereof is opposite to the pressure relief hole 21. When the movable outer cover 3 moves toward the fixed inner cover 2, the lower end of the pressure relief valve body 4 blocks the pressure relief hole 21; when the movable outer cover 3 moves in the direction away from the fixed inner cover 2, the blockage of the pressure relief hole 21 is released.

[0048] In the present invention, the elastic pressing fastener 5 allows the movable outer cover 3 to reciprocate in the direction of approaching and moving away from the fixed inner cover 2 and remain stable in the locked position.

[0049] During use, by pressing downward (manually), the elastic pressing fastener 5 is forced to drive the movable outer cover 3 to move toward the fixed inner cover 2. At the same time, the pressure relief valve body 4 follows the movable outer cover 3 to move toward the fixed inner cover 2. The elastic pressing fastener 5 drives the movable outer cover 3 to move downward a distance that just allows the lower end of the pressure relief valve body 4 to block the pressure relief through hole 21, and the movable outer cover 3 can just remain stable in the locked position. At this time, the pressure relief cover is in a non-pressure relief state (closed). If it is the cover of a water boiling cup, this state can keep the water in the water boiling cup warm.

[0050] Press the elastic pressing fastener 5 again, and the elastic pressing fastener 5 is forced to drive the movable outer cover 3 to move away from the fixed inner cover 2. At the same time, the pressure relief valve body 4 moves along with the movable outer cover 3 to move away from the fixed inner cover 2, so that the lower end of the pressure relief valve body 4 leaves the position of blocking the pressure relief through hole 21, and the pressure relief through hole 21 is in a state of communication with the outside world. The gas inside the pressure relief cover can enter the outer cylinder of the pressure relief cover through the pressure relief through hole 21, and then be discharged to the outside of the pressure relief cover through the gap between the side edge of the movable outer cover 3 and the inner wall of the outer cylinder 1. At this time, the pressure relief cover is in the pressure relief working state.

[0051] In this embodiment, the fixed inner cover 2 and the movable outer cover 3 are in a parallel position relationship with each other, and the two are in a non-parallel position relationship. However, the inventive concept of the pressure relief structure used is consistent with the invention content claimed to be protected by the present invention, and should be understood to fall within the scope of protection of the present invention.

[0052] Preferably, the movable outer cover 3 is a T-shaped structural member consisting of a transverse cover portion 31 and a longitudinal cylinder portion 32, wherein a gap is provided between the side edge of the transverse cover portion 31 and the inner side wall of the outer cylinder 1, and a gap is provided between the bottom end surface of the longitudinal cylinder portion 32 and the end surface of the fixed inner cover 2;

[0053] The pressure relief hole 21 is located in the space surrounded by the longitudinal cylindrical portion 32 .

[0054] In this embodiment, the movable outer cover 3 is a T-shaped structural member, and the pressure relief hole 21 is located in the space surrounded by the longitudinal cylinder 32. The gas inside the pressure relief cover first enters the longitudinal cylinder 32 through the pressure relief hole 21, and then overflows through the gap between the bottom end surface of the longitudinal cylinder 32 and the end surface of the fixed inner cover 2, and finally is discharged to the outside of the pressure relief cover through the gap between the side edge of the transverse cover 31 and the inner wall of the outer cylinder 1. The speed of gas overflow is slowed down by the turning of the path.

[0055] Furthermore, an abutting elastic member 6 is provided between the fixed inner cover 2 and the movable outer cover 3 . When the movable outer cover 3 moves toward the fixed inner cover 2 , the abutting elastic member 6 is compressed.

[0056] In this embodiment, the abutting elastic member 6 can, on the one hand, utilize its elastic force to increase the stability of the movable outer cover 3 relative to the fixed inner cover 2, and on the other hand, improve the tightness of the pressure relief cover in the non-pressure relief state, thereby improving practicality.

[0057] It should be emphasized that when the movable outer cover 3 is a T-shaped structural member, the abutment spring 6 can be arranged inside the longitudinal cylinder 32 or outside the longitudinal cylinder 32, as long as the use requirements are met.

[0058] Preferably, the fixed inner cover 2 includes a cylindrical portion 22 and an annular edge 23, and the inner edge of the annular edge 23 is fixedly connected to the upper edge of the cylindrical portion 22;

[0059] The pressure relief hole 21 is provided on the bottom wall of the cylindrical portion 22;

[0060] The longitudinal cylindrical portion 32 is accommodated in the cylindrical portion 22 , and a distance is provided between the outer wall surface of the longitudinal cylindrical portion 32 and the inner wall surface of the cylindrical portion 22 ; a distance is provided between the bottom end surface of the longitudinal cylindrical portion 32 and the bottom wall surface of the cylindrical portion 22 .

[0061] In this embodiment, the pressure relief hole 21 is provided on the bottom wall surface of the cylinder portion 22 and is located in the space surrounded by the longitudinal cylinder portion 32. The gas inside the pressure relief cover first enters the longitudinal cylinder portion 32 through the pressure relief hole 21, and then enters the gap between the outer wall surface of the longitudinal cylinder portion 32 and the inner wall surface of the cylinder portion 22 through the gap between the bottom end surface of the longitudinal cylinder portion 32 and the bottom wall surface of the cylinder portion 22, and finally is discharged to the outside of the pressure relief cover through the gap between the side edge of the transverse cover portion 31 and the inner wall of the outer cylinder 1, further increasing the tortuosity of the gas overflow path and slowing down its overflow speed.

[0062] Preferably, an outer wall surface of the longitudinal cylindrical portion 32 is provided with an anti-slip lower edge 33, one end of the anti-slip lower edge 33 is fixed to the outer wall of the longitudinal cylindrical portion 32, and the other end extends toward the inner wall surface of the cylindrical portion 22; a gap is provided between the free end of the anti-slip lower edge 33 and the inner wall surface of the cylindrical portion 22;

[0063] The inner wall surface of the cylindrical portion 22 is provided with an anti-slip upper edge 24, one end of the anti-slip upper edge 24 is fixed to the inner wall surface of the cylindrical portion 22, and the other end extends toward the outer side wall of the longitudinal cylindrical portion 32;

[0064] The anti-slip upper edge 24 corresponds to the upper side of the anti-slip lower edge 33 , and the two at least partially overlap in the vertical space.

[0065] In this embodiment, the anti-slip lower edge 33 can be arranged in a ring shape, and the anti-slip upper edge 24 can be arranged at several intervals and evenly distributed. The anti-slip lower edge 33 and the anti-slip upper edge 24 at least partially overlap in the vertical space, that is, the extension length of the free end of the anti-slip upper edge 24 toward the inner wall surface of the cylindrical portion 22 must at least cover the top of the anti-slip lower edge 33 to prevent the movable outer cover 3 from falling off from the fixed inner cover 2, which is convenient for use.

[0066] Preferably, an inner wall surface of the cylindrical portion 22 is provided with an inwardly protruding guide ridge 25 , and an outer wall surface of the longitudinal cylindrical portion 32 is provided with a guide notch 34 adaptively engaged with the guide ridge 25 .

[0067] In this embodiment, a number of guide ridges 25 are evenly spaced apart, and correspondingly, the outer wall surface of the longitudinal cylinder 32 is provided with guide notches 34 of corresponding number and position, which limits the rotational movement of the movable outer cover 3 relative to the fixed inner cover 2, improves the accuracy of sealing the pressure relief hole 21, and facilitates use.

[0068] Preferably, the pressure relief valve body 4 includes a valve cylinder 41, a pressure relief spring 42, a valve head rod 43 and a plug 44 capable of completely blocking the pressure relief through hole 21;

[0069] The upper end of the valve cylinder 41 is fixed to the inner end surface of the movable outer cover 3, the pressure relief spring 42 is arranged in the internal cavity of the valve cylinder 41, and the upper end of the valve head rod 43 is arranged in the valve cylinder 41 and abuts against the pressure relief spring 42; the upper end of the valve head rod 43 can reciprocate linearly along the axial direction of the valve cylinder 41;

[0070] The plug 44 is disposed at the lower end of the valve head rod 43 .

[0071] Due to the structure of the pressure relief valve body 4 of this embodiment, if the user forgets to press the movable outer cover 3 to put the pressure relief cover in the pressure relief working state, and the container with the pressure relief cover is continuously heating liquid (such as boiling water), the gas in the container will continue to expand due to the heat. When the gas pressure in the container expands to a certain value, the expanding gas will push the plug 44 upward, causing it to break contact with the pressure relief hole 21, and the pressure relief channel will be opened. During this process, the valve head rod 43 moves upward relative to the valve cylinder 41, compressing the pressure relief spring 42 upward. After the heating activity ends, the volume of the gas in the container gradually shrinks, and the gas pressure returns to equilibrium with the outside world. The compressed pressure relief spring 42 gradually recovers its deformation, exerting a downward driving force on the valve head rod 43, which drives the plug 44 downward until the pressure relief hole 21 is re-sealed, thereby maintaining the temperature of the liquid in the container. The entire process is completely completed by the various components of the pressure relief cover, avoiding the safety issues that may be caused by the continuous expansion of gas in the container due to heat in this situation, and facilitating use.

[0072] Furthermore, the lower outer side wall of the plug 44 is tapered, and the valve head rod 43 is fixed in the middle thereof.

[0073] Preferably, the elastic pressing fastener 5 is an elastic self-locking device, the main body 51 of the elastic self-locking device is fixed to the fixed inner cover 2 , and the male head 52 thereof is fixed to the movable outer cover 3 .

[0074] In this embodiment, the elastic pressing fastener 5 directly uses an elastic self-locking device, which has a high cost performance.

[0075] like Figure 4 As shown, this embodiment relates to a container with a liquid heating function, including a container body 7, a heating component and the above-mentioned pressure relief cover, the container body 7 has an inner cavity for holding liquid, the heating component is installed in the container, and the pressure relief cover is detachably snapped onto the container body 7. The container body 7 can be a cup body of various shapes, or a kettle body of various shapes, etc. Any container that has an inner cavity for holding liquid and can heat the liquid through a built-in heating component falls within the scope of protection of the present invention.

[0076] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A pressure relief cover, characterized in that: It includes an outer cylinder, a fixed inner cover, a movable outer cover, a pressure relief valve body and an elastic pressing fastener; The side edge of the fixed inner cover is fixedly connected to the inner side wall of the outer cylinder; The movable outer cover is connected to the fixed inner cover via an elastic pressing member, so that it can reciprocate in the direction of approaching and moving away from the fixed inner cover and remain stable in the locked position; the elastic pressing fastener is an elastic self-locking device, the main body of which is fixed to the fixed inner cover, and the male head of which is fixed to the movable outer cover; a gap is provided between the side edge of the movable outer cover and the inner side wall of the outer cylinder; The end surface of the fixed inner cover is provided with a pressure relief hole communicating with the outside world. The upper end of the pressure relief valve body is fixedly connected to the movable outer cover, and the lower end thereof faces the pressure relief hole. When the movable outer cover moves toward the fixed inner cover, the lower end of the pressure relief valve body blocks the pressure relief hole; when the movable outer cover moves away from the fixed inner cover, the blockage of the pressure relief hole is released. The pressure relief valve body includes a valve cylinder, a pressure relief spring, a valve head rod and a plug capable of completely blocking the pressure relief through hole; the upper end of the valve cylinder is fixed to the inner end surface of the movable outer cover, the pressure relief spring is arranged in the internal cavity of the valve cylinder, the upper end of the valve head rod is arranged in the valve cylinder and abuts against the pressure relief spring; the upper end of the valve head rod can reciprocate linearly along the axial direction of the valve cylinder; the plug is arranged at the lower end of the valve head rod; The movable outer cover is a T-shaped structural member consisting of a transverse cover portion and a longitudinal cylinder portion. A gap is provided between the side edge of the transverse cover portion and the inner side wall of the outer cylinder, and a gap is provided between the bottom end surface of the longitudinal cylinder portion and the end surface of the fixed inner cover. The pressure relief through hole is located in the space surrounded by the longitudinal cylinder portion. An abutting elastic member is provided between the fixed inner cover and the movable outer cover, and when the movable outer cover moves in a direction close to the fixed inner cover, the abutting elastic member is compressed. The fixed inner cover comprises a cylindrical portion and an annular edge, wherein the inner edge of the annular edge is fixedly connected to the upper edge of the cylindrical portion; The pressure relief through hole is arranged on the bottom wall surface of the cylindrical portion; The longitudinal cylindrical portion is accommodated in the cylindrical portion, and a gap is provided between the outer wall surface of the longitudinal cylindrical portion and the inner wall surface of the cylindrical portion; a gap is provided between the bottom end surface of the longitudinal cylindrical portion and the bottom wall surface of the cylindrical portion; an anti-slip lower edge is provided on the outer wall surface of the longitudinal cylindrical portion, one end of the anti-slip lower edge is fixed to the outer side wall of the longitudinal cylindrical portion, and the inner wall of the other end extends in a direction close to the inner wall surface of the cylindrical portion; a gap is provided between the free end of the anti-slip lower edge and the cylindrical surface; The inner wall surface of the cylindrical portion is provided with an anti-slip upper edge, one end of the anti-slip upper edge is fixed to the inner wall surface of the cylindrical portion, and the other end extends toward the outer side wall of the longitudinal cylindrical portion; The anti-slip upper edge corresponds to the upper side of the anti-slip lower edge, and the two at least partially overlap in the vertical space.

2. The pressure relief cover according to claim 1, wherein: An inner wall surface of the cylindrical portion is provided with an inwardly protruding guide ridge, and an outer wall surface of the longitudinal cylindrical portion is provided with a guide notch which is adaptively engaged with the guide ridge.

3. The pressure relief cover according to claim 1, wherein: The lower outer side wall of the plug is conical, and the valve head rod is fixed in the middle thereof.

4. A container with liquid heating function, characterized in that: It comprises a container body, a heating component and a pressure relief cover as described in any one of claims 1 to 3, wherein the container body has an inner cavity for holding liquid, the heating component is installed in the container, and the pressure relief cover is detachably fastened to the container body.

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