An explosion-proof top cover and an electric thermos with the explosion-proof top cover

Abstract

The present invention relates to the technical field of electric thermos flasks, and particularly to an explosion-proof top cover and an electric thermos flask having the same. The explosion-proof top cover includes an upper cover, a middle cover, and a lower cover that are stacked. There is a gap between the middle cover and the upper cover and the lower cover. The upper cover is provided with an exhaust port, the middle cover is provided with a main air outlet, a first pressure relief port, and a second pressure relief port, and the lower cover is provided with a first air inlet and a second air inlet. A pressing block is provided between the middle cover and the lower cover. The pressing block is located below the main air outlet and can move between a first position and a second position. According to the technical solution of the present invention, the top cover structure can both achieve air outlet and exhaust. Moreover, whether it is air outlet under normal conditions or exhaust when the thermos flask is tilted, two ports are carried out simultaneously. When the pressure inside the electric thermos flask suddenly increases, the gas can be discharged in time for pressure relief, thereby avoiding the possibility of explosion.

Description

Technical Field

[0001] The present invention relates to the technical field of electric thermos flasks, and particularly to an explosion-proof top cover and an electric thermos flask having the explosion-proof top cover. Background Art

[0002] An electric thermos flask is a popular water treatment appliance, which has the advantages of small size, easy to move, and no secondary pollution in water treatment compared with a water dispenser. Currently, most electric thermos flasks adopt a button-operated water outlet method, and the overall structure tends to be a closed structure. Generally, an exhaust hole is provided on the upper cover to balance the internal pressure.

[0003] In the existing electric thermos flasks, the exhaust structure of the upper cover is relatively simple, that is, it can be connected to the inside for exhaust. The defect of this structure is that if the electric thermos flask is tilted, the internal pressure will increase instantaneously. At this time, if the exhaust cannot be carried out in time, it is very easy to cause the electric thermos flask to explode, and the safety is relatively low. Summary of the Invention

[0004] In view of this, the main object of the present invention is to provide an explosion-proof top cover and an electric thermos flask having the explosion-proof top cover, which can exhaust gas in time when the internal air pressure of the electric thermos flask increases instantaneously, and avoid the explosion phenomenon caused by excessive internal pressure.

[0005] To achieve the above object, according to one aspect of the present invention, there is provided an explosion-proof top cover, including an upper cover, a middle cover and a lower cover which are stacked. There is a gap between the middle cover and the upper cover and the lower cover. An exhaust port is provided on the upper cover. A main air outlet, a first pressure relief port and a second pressure relief port are provided on the middle cover. A first air inlet and a second air inlet are provided on the lower cover. A pressing block is provided between the middle cover and the lower cover. The pressing block is located below the main air outlet and can move between a first position and a second position. Wherein, when the pressing block is in the first position, there is a first ventilation channel between the pressing block and the middle cover. The first air inlet, the second air inlet, the first ventilation channel, and the main air outlet and / or the first pressure relief port, and the exhaust port form an air outlet channel. When the pressing block is in the second position, there is a second ventilation channel between the pressing block and the lower cover. The first air inlet, the second air inlet, the second ventilation channel, and the second pressure relief port and / or the first pressure relief port, and the exhaust port form a pressure relief channel.

[0006] Optionally, a first exhaust space is provided in the interval between the upper cover and the middle cover, and a second exhaust space is provided in the interval between the middle cover and the lower cover; the exhaust port is communicated with the first exhaust space; the first exhaust space and the second exhaust space are communicated through the main air outlet, the first pressure relief port and the second pressure relief port, and the first air inlet and the second air inlet are communicated with the second exhaust space.

[0007] Optionally, the lower cover is provided with a groove for accommodating the pressing block; the cross-section of the bottom of the pressing block is funnel-shaped and includes an inclined surface, and the inner surface of the groove is a guiding surface that can match the inclined surface at the bottom of the pressing block.

[0008] Optionally, an annular retaining wall is provided on the middle cover in the direction of the lower cover, the pressing block is located within the annular retaining wall, and the inner diameter of the annular retaining wall is greater than the outer diameter of the pressing block.

[0009] Optionally, the diameter of the main air outlet is greater than the diameters of the first pressure relief port and the second pressure relief port.

[0010] Optionally, a pressure relief rubber pad is connected to the middle cover. The pressure relief rubber pad includes a columnar connecting portion that is fixedly connected to the middle cover; the top of the connecting portion is provided with a sealing portion that extends horizontally outward. The sealing portion is attached to the upper surface of the middle cover and seals the second pressure relief port on the middle cover.

[0011] Optionally, a guiding channel is provided on the main air outlet in the direction of the upper cover. The top of the guiding channel is closed, and an opening for air outlet is provided on the side wall.

[0012] Optionally, the number of the first air inlet, the first pressure relief port, the second pressure relief port, and the exhaust port is multiple.

[0013] Optionally, the pressing block is a stainless steel pressing block.

[0014] On the other hand, the present invention also provides an electric thermos with the explosion-proof top cover, including a kettle body. An opening is provided at the top of the kettle body, and the above-mentioned explosion-proof top cover is provided on the opening.

[0015] According to the technical solution of the present invention, a pressing block is provided inside the top cover, and the switching of the air outlet channel and the pressure relief channel can be realized according to the position of the pressing block. Specifically, when the electric thermos is in an upright state, the pressing block is located at the first position by its own weight. At this time, there is a first ventilation channel between the top of the pressing block and the main air outlet (that is, the pressing block does not block the main air outlet), and both the main air outlet and the first pressure relief port can exhaust air outward.

[0016] When the electric thermos is in a tilted state, the pressing block changes with the tilting position and moves to the second position. At this time, there is a second ventilation channel between the pressing block and the lower cover (i.e., the pressing block blocks the main air outlet), and the first pressure relief port and the second pressure relief port can be used for pressure relief and exhaust.

[0017] In this technical solution, the top cover structure can not only achieve air outlet but also achieve exhaust. Moreover, whether it is air outlet under normal conditions or exhaust during tilting, both are carried out simultaneously through two ports. When the pressure inside the electric thermos suddenly increases, the gas can be discharged in time for pressure relief, which helps to avoid the possibility of explosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] For purposes of illustration and not limitation, the present invention will now be described with reference to the preferred embodiments of the present invention, particularly with reference to the accompanying drawings, in which:

[0019] Figure 1 shows the front view of the explosion-proof top cover according to an embodiment of the present invention;

[0020] Figure 2 shows the bottom view of the explosion-proof top cover according to an embodiment of the present invention;

[0021] Figure 3 shows Figure 1 the sectional view taken along A-A in the upright state;

[0022] Figure 4 is Figure 3 the partial enlarged view at the pressing block in

[0023] Figure 5 shows Figure 1 the sectional view taken along B-B in the upright state;

[0024] Figure 6 shows Figure 1 the sectional view taken along A-A in the tilted state;

[0025] Figure 7 shows Figure 1 the sectional view taken along B-B in the tilted state;

[0026] Figure 8 shows Figure 1 the sectional view taken along C-C in the tilted state.

[0027] In the figures:

[0028] 1: Upper cover; 2: Middle cover; 3: Lower cover; 4: Pressing block; 5: First exhaust space; 6: Second exhaust space; 11: Exhaust port; 21: Main air outlet; 22: First pressure relief port; 23: Second pressure relief port; 24: Pressure relief rubber pad; 25: Guide channel; 26: Annular retaining wall; 31: First air inlet; 32: Second air inlet; 33: Groove; 41: Inclined surface; 61: First ventilation channel; 62: Second ventilation channel; 331: Guide surface. Detailed implementation mode

[0029] Reference Figure 1-8 In an embodiment of the present invention, an explosion-proof top cover is provided, which includes an upper cover 1, a middle cover 2 and a lower cover 3 arranged in a stacked manner. There is a gap between the middle cover 2 and the upper cover 1 and the lower cover 3. An exhaust port 11 is provided on the upper cover 1, a main air outlet 21, a first pressure relief port 22 and a second pressure relief port 23 are provided on the middle cover 2, and a first air inlet 31 and a second air inlet 32 are provided on the lower cover 3; A pressing block 4 is provided between the middle cover 2 and the lower cover 3. The pressing block 4 is located below the main air outlet 21. The pressing block 4 can move between a first position and a second position; wherein the first position is close to the lower cover, and the second position is close to the middle cover; wherein, when the pressing block 4 is in the first position, there is a first ventilation channel 61 between the pressing block 4 and the middle cover 2, so that the first air inlet 31, the second air inlet 32, the first ventilation channel 61, and the main air outlet 21 and / or the first pressure relief port 22, and the exhaust port 11 form an air outlet channel; when the pressing block 4 is in the second position, there is a second ventilation channel 62 between the pressing block 4 and the lower cover 3, and the first air inlet 31, the second air inlet 32, the second ventilation channel 62, and the second pressure relief port 23 and / or the first pressure relief port 22, and the exhaust port 11 form a pressure relief channel.

[0030] In this embodiment, a pressing block structure is arranged inside the top cover, and the first ventilation channel 61 and the second ventilation channel 62 can be switched by using the pressing block 4. When the electric thermos is placed normally, the top cover is in a horizontal state, and the pressing block 4 inside it fits against the surface of the lower cover 3 by its own gravity. At this time, the first ventilation channel 61 is connected, and the top cover can provide normal exhaust operation. During the exhaust process, there are two exhaust methods, as Figure 3 shown, the main exhaust is composed of the first air inlet 31, the second air inlet 32, the first ventilation channel 61, the main air outlet 21 and the exhaust port 11; as Figure 5 shown, the auxiliary exhaust is composed of the first air inlet 31, the second air inlet 32, the first ventilation channel 61, the first pressure relief port 22 and the exhaust port 11.

[0031] When the electric thermos flask is tilted, the top cover also tilts (non - thermos state), and the position of the pressing block 4 inside it also changes accordingly. That is, at this time, the pressing block 4 is in the second position, contacting the lower surface of the middle cover 2 and blocking the main air outlet 21. Among them, the upper surface of the pressing block 4 is a flat structure, and its area is larger than the area of the main air outlet 21. When the two are attached, it can ensure that the pressing block 4 blocks the main air outlet 21. At this time, the second exhaust passage is connected, and the top cover can perform a pressure - relief operation. During the pressure - relief process, there are two pressure - relief methods, as Figure 6 shown, the main pressure - relief is composed of the first air inlet 31, the second air inlet 32, the second ventilation passage 62, the second pressure - relief port 23, and the exhaust port 11; as Figure 7 shown, the auxiliary pressure - relief is composed of the first air inlet 31, the second air inlet 32, the second ventilation passage 62, the first pressure - relief port 22, and the exhaust port 11.

[0032] The pressing block 4 of this explosion - proof top cover is a stainless - steel pressing block, which has a certain self - weight. When the electric thermos flask is placed normally, due to relying on the self - weight of the pressing block 4, it will inevitably be in the first position. Preferably, as Figure 4 shown, in order to limit the position of the pressing block 4 in the first position and ensure that it can stay in the correct position, the lower cover 3 is provided with a groove 33 for accommodating the pressing block 4; the interface at the bottom of the pressing block 4 is in a funnel shape including an inclined surface 41, and the inner surface of the groove 33 is a guiding surface 331 that can match the bottom inclined surface 41 of the pressing block 4; the middle cover 2 is provided with an annular retaining wall 26 arranged towards the lower cover 3. The pressing block is located inside the annular retaining wall 26, and the inner diameter of the annular retaining wall 26 is larger than the outer diameter of the pressing block 4. When the explosion - proof top cover is in a horizontal state, the bottom inclined surface 41 of the pressing block 4 contacts the inner surface of the groove 33, and the inner surface of the groove 33, which is the guiding surface 331, has a guiding effect on the pressing block 4, enabling the pressing block 4 to smoothly enter the groove 33; the inner diameter of the annular retaining wall 26 is larger, and there is a certain gap between it and the pressing block 4 to ensure the steam circulation. It has a certain limiting effect on the pressing block 4 in the horizontal direction, which can prevent the pressing block 4 from shifting in the horizontal direction; through the groove 33 and the annular retaining wall 26, the position of the pressing block 4 is effectively limited, enabling it to move in the correct position.

[0033] When the electric thermos flask is tilted, it is not certain that the pressing block 4 is necessarily in the second position. It may also be between the first position and the second position. When the pressing block 4 is in this state, both the first ventilation passage 61 and the second ventilation passage 62 are in a connected state. At this time, whether it is the first pressure - relief port 22, the main air outlet 21, or the second pressure - relief port 23, they can all be used for pressure - relief and exhaust, and the explosion can also be avoided.

[0034] When an electric thermos flask is in use, since the inside of it is filled with high-temperature hot water, the internal pressure increases instantaneously when it is being poured. During the pressure relief operation, the main purpose is to discharge the part of the air pressure that has increased instantaneously. The pressure relief structure is arranged on the top cover (the structure at the very top of the electric thermos flask). When pouring, water will not block the first air inlet 31 and / or the second air inlet 32 located on the top cover instantaneously. Therefore, the pressure relief operation can be ensured to be completed smoothly. Even if the water finally (after the electric thermos flask is poured) blocks the first air inlet 31 and the second air inlet 32, at this time, the pressure relief operation has been completed, and the phenomenon of explosion will still not occur.

[0035] In a preferred embodiment of the present embodiment, an independent space is provided between the middle cover 2, the upper cover 1 and the lower cover 3 for exhaust and pressure relief operations. That is, a first exhaust space 5 is provided in the interval between the upper cover 1 and the middle cover 2, and a second exhaust space 6 is provided in the interval between the middle cover 2 and the lower cover 3; the exhaust port 11 is communicated with the first exhaust space 5; the first exhaust space 5 and the second exhaust space 6 are communicated through the main air outlet 21, the first pressure relief port 22 and the second pressure relief port 23, and the first air inlet 31 and the second air inlet 32 are communicated with the second exhaust space 6. Inside the top cover, structures such as a control panel also need to be arranged. Therefore, setting up an independent exhaust and pressure relief space has a certain guiding effect on the steam and can avoid affecting the normal use of other components.

[0036] Preferably, the diameter of the main air outlet 21 is larger than the diameters of the first pressure relief port 22 and the second pressure relief port 23. The number of the first air inlet 31, the first pressure relief port 22, the second pressure relief port 23 and the exhaust port 11 is multiple. The main air outlet 21 serves as the main air outlet channel, and most of the steam is discharged through this port, while the first pressure relief port 22 and the second pressure relief port 23 mainly exhaust in a permeating manner, and their diameters are relatively small.

[0037] In a preferred embodiment of the present embodiment, as Figure 8 shown, a pressure relief rubber pad 24 is connected to the middle cover 2. The pressure relief rubber pad 24 includes a columnar connecting portion, and the connecting portion is fixedly connected to the middle cover 2; the top end of the connecting portion is provided with a horizontally extending blocking portion outward, and the blocking portion fits with the upper surface of the middle cover 2 and covers the second pressure relief port 23 on the middle cover 2. In the pouring state, when performing the pressure relief operation, if the instantaneous pressure is relatively large, the phenomenon of high-temperature hot water spraying out may occur. Therefore, a pressure relief rubber pad 24 is provided at the second pressure relief port 23 (this port is the main pressure relief port and is located below the exhaust port 11). When relieving pressure, the blocking portion is first blown up by the pressure, and then exhaust is carried out through the second pressure relief port 23. The blocking portion effectively avoids the phenomenon of direct spraying of hot water. Similarly, a guiding channel 25 is provided on the main air outlet 21 and is arranged in the direction of the upper cover 1. The top of the guiding channel 25 is closed, and an opening for air outlet is provided on the side wall of the guiding channel 25. Adopting the side opening method will not affect the normal exhaust, and at the same time, it can avoid direct spraying of hot water.

[0038] On the other hand of the embodiment of the present invention, there is also provided an electric thermos with the explosion-proof top cover, which includes a kettle body. An opening is provided at the top of the kettle body, and the above-mentioned explosion-proof top cover is provided on the opening. A rotating shaft is provided on the explosion-proof top cover, and through the rotating shaft, the explosion-proof top cover is integrally connected with the kettle body to form an electric kettle. When in use, if the kettle is tilted, the internal pressure can be smoothly discharged through the pressure relief channel at the moment of tilting, avoiding the explosion situation, and making it safer and more reliable during use.

[0039] The above specific implementation manners do not constitute a limitation to the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can occur depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An explosion-proof top cover, comprising an upper cover (1), a middle cover (2) and a lower cover (3) which are stacked, and there is a gap between the middle cover (2) and the upper cover (1) and the lower cover (3), and it is characterized in that: The upper cover (1) is provided with an exhaust port (11), the middle cover (2) is provided with a main air outlet (21), a first pressure relief port (22) and a second pressure relief port (23), and the lower cover (3) is provided with a first air inlet (31) and a second air inlet (32); A pressure block (4) is arranged between the middle cover (2) and the lower cover (3), the pressure block (4) is located below the main air outlet (21), and can move between a first position and a second position; wherein: When the pressure block (4) is in the first position, there is a first ventilation channel (61) between the pressure block (4) and the middle cover (2), and the first air inlet (31), the second air inlet (32), the first ventilation channel (61), and the main air outlet (21) and / or the first pressure relief port (22), and the exhaust port (11) form an air outlet channel; When the pressure block (4) is in the second position, there is a second ventilation channel (62) between the pressure block (4) and the lower cover (3), and the first air inlet (31), the second air inlet (32), the second ventilation channel (62), and the second pressure relief port (23) and / or the first pressure relief port (22), and the exhaust port (11) form a pressure relief channel, So that the normal air outlet and pressure relief exhaust of the explosion-proof top cover are carried out simultaneously through two gas outlets.

2. The explosion-proof top cover according to claim 1, wherein, A first exhaust space (5) is arranged in the gap between the upper cover (1) and the middle cover (2), and a second exhaust space (6) is arranged in the gap between the middle cover (2) and the lower cover (3); The exhaust port (11) is communicated with the first exhaust space (5); the first exhaust space (5) and the second exhaust space (6) are communicated through the main air outlet (21), the first pressure relief port (22) and the second pressure relief port (23), and the first air inlet (31) and the second air inlet (32) are communicated with the second exhaust space (6).

3. The explosion-proof top cover according to claim 1, characterized in that, The lower cover (3) is provided with a groove (33) for accommodating the pressure block (4); The cross-section of the bottom of the pressure block (4) is funnel-shaped, including an inclined surface (41), and the inner surface of the groove (33) is a guiding surface (331) that can match the bottom inclined surface (41) of the pressure block (4).

4. The explosion-proof top cover according to claim 3, characterized in that, The middle cover (2) is provided with an annular retaining wall (26) arranged in the direction of the lower cover (3), the pressure block (4) is located inside the annular retaining wall (26), and the inner diameter of the annular retaining wall (26) is greater than the outer diameter of the pressure block (4).

5. The explosion-proof top cover according to claim 1, characterized in that, The diameter of the main air outlet (21) is greater than the diameters of the first pressure relief port (22) and the second pressure relief port (23).

6. The explosion-proof top cover according to claim 1, wherein, A pressure relief rubber pad (24) is connected to the middle cover (2), and the pressure relief rubber pad (24) includes a columnar connecting portion, and the connecting portion is fixedly connected to the middle cover (2); The top end of the connecting part is provided with a blocking part extending horizontally outwards, the blocking part is attached to the upper surface of the middle cover (2), and blocks the second pressure relief opening (23) on the middle cover (2).

7. The explosion-proof top cover according to claim 1, wherein A guiding channel (25) is provided on the main air outlet (21) and is arranged towards the upper cover (1). The top of the guiding channel (25) is closed, and an opening for air outlet is provided on the side wall.

8. The explosion-proof top cover according to claim 1, characterized in that, The number of the first air inlet (31), the first pressure relief opening (22), the second pressure relief opening (23) and the exhaust port (11) is multiple.

9. The explosion-proof top cover according to claim 1, characterized in that, The pressing block (4) is a stainless steel pressing block.

10. An electric thermos with such an explosion-proof top cover, characterized in that, It includes a kettle body. An opening is provided at the top of the kettle body, and an explosion-proof top cover as described in any one of claims 1-9 is provided on the opening.

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