Drain valve based on gravity control

Abstract

The utility model relates to the technical field of drain valves, and discloses a drain valve based on gravity control, the drain valve comprises a valve body, the interior of the valve body is provided with a cavity, the valve body comprises an inner side surface and an outer side surface opposite to the inner side surface, and the inner side surface is provided with a liquid inlet; a liquid outlet is formed in the outer side surface, and the liquid outlet can be communicated with the liquid inlet through the cavity; the gravity ball is arranged in the cavity of the valve body; the sealing element is arranged between the gravity ball and the liquid inlet and is used for sealing the liquid inlet; the inclined plane structure is arranged on the other side, opposite to the sealing piece, in the valve body, the side, facing the gravity ball, of the inclined plane structure is provided with an upward inclined plane, and the shortest distance between the inclined plane and the sealing piece is smaller than the diameter of the gravity ball. According to the embodiment of the invention, the manufacturing and maintenance cost of the drain valve can be reduced, and the drain effect of the drain valve can be improved.

Description

Technical Field

[0001] This application belongs to the field of drainage valve technology, specifically relating to a gravity-controlled drainage valve. Background Technology

[0002] When existing vehicles are exposed to rain or other liquids, water may seep into the vehicle's dashboard. Over time, this water can corrode the vehicle and create safety hazards.

[0003] To drain accumulated water, vehicle dashboards (such as door panels) are often equipped with corresponding drain outlets. To prevent foreign objects from entering the vehicle, drain valves are usually installed at these outlets. However, existing drain valves mostly rely on external power sources such as elastic structures, electromagnetic force, or air pressure to control the opening and closing of the valve. These methods not only rely on high-precision machining and complex sealing materials for sealing performance, resulting in high costs and susceptibility to damage, increasing system complexity and maintenance costs, but may also fail to function properly in certain extreme environments (such as without electricity or air supply). Furthermore, because the external power source of traditional drain valves applies a relatively large force to the valve, if there is only a small amount of liquid inside the vehicle dashboard, the valve may not be able to be opened, resulting in incomplete drainage of the liquid. Utility Model Content

[0004] To address the shortcomings of the prior art, this application provides a gravity-controlled drain valve, which can reduce the cost of the drain valve and improve its draining effect.

[0005] A gravity-controlled drain valve, the drain valve comprising:

[0006] The valve body has an internal cavity, including an inner side and an outer side opposite to the inner side. The inner side is provided with a mounting part for installing a seal, and the mounting part has a liquid inlet. The outer side has a liquid outlet, and the liquid outlet can communicate with the liquid inlet through the cavity.

[0007] A gravity ball is disposed within the cavity of the valve body;

[0008] A sealing element is disposed between the gravity ball and the liquid inlet to seal the liquid inlet;

[0009] An inclined structure is provided on the other side of the valve body opposite to the seal, and an upward inclined surface is provided on the side facing the gravity ball. The closest distance between the inclined surface and the seal is less than the diameter of the gravity ball.

[0010] When the gravity ball is located at the low point of the slope, it simultaneously abuts against the slope and the seal, and the seal presses and seals the inlet to close the drain valve. When the seal is affected by the liquid and pushes the gravity ball to move towards the high point of the slope, the seal can detach from the valve body to open the drain valve.

[0011] In one embodiment, the valve body has a valve cover on its outer side, and the inclined structure is provided on the valve cover.

[0012] In one embodiment, the liquid outlet is located at the bottom of the valve cover; the liquid outlet is a strip-shaped opening provided along the edge of the valve cover.

[0013] In one embodiment, a first sealing ring is provided between the sealing element and the valve body, and the first sealing ring is provided on the sealing element or the valve body.

[0014] In one embodiment, the seal includes a boss and a pressing portion, the pressing portion being disposed around the boss;

[0015] The first sealing ring is located on the side of the pressure-receiving part facing the valve body; the platform of the boss can extend into the liquid inlet and abut against at least part of the liquid inlet.

[0016] In one embodiment, the boss is provided with a receiving groove, and when the gravity ball abuts against the seal, at least a portion of the gravity ball is located within the receiving groove.

[0017] In one embodiment, the valve body has a plurality of positioning ribs inside, and the edge of the valve cover has a plurality of positioning grooves that are adapted to the positioning ribs; or,

[0018] The valve cover has several positioning ribs at its edge, and the valve body has several positioning grooves inside that are adapted to the positioning ribs.

[0019] In one embodiment, the valve body is provided with a faceted structure, and the valve cover is provided with a chamfer on one side corresponding to the faceted structure, which cooperates with the faceted structure.

[0020] In one embodiment, the valve body has a sloping structure for drainage between the inlet and outlet.

[0021] In one embodiment, the valve body has a notch for draining liquid at a position opposite to the liquid outlet.

[0022] This application provides a gravity-controlled drain valve, which has an outlet and an inlet. A sealing element is provided at the inlet of the valve body. Through cooperation with the inclined structure and the gravity ball, the gravity ball can press against the sealing element under gravity to seal the inlet. The specific effects are as follows:

[0023] 1. When there is little liquid at the inlet, the pressure exerted by the gravity ball on the seal is greater than or equal to the pressure exerted by the liquid on the seal. The seal is pressed against the valve body and the inlet, thus sealing the inlet. When there is a lot of liquid at the inlet, the pressure exerted by the gravity ball on the seal is less than the pressure exerted by the liquid on the seal. At this time, the gravity ball moves away from the seal along the inclined structure or has a tendency to move, so that the seal can be pushed away from the inner side of the valve body by the liquid. Then the liquid can flow into the valve body through the inlet and out through the outlet. When the liquid is discharged and the pressure on the seal is less than the pressure exerted by the gravity ball on the seal, the gravity ball returns to its original position along the inclined structure under the action of gravity and presses against the seal, so that the inlet returns to the sealed state.

[0024] 2. During vehicle operation, the gravity ball may be affected by vibration, causing it to temporarily stop applying pressure to the seal, or the pressure applied to the seal may be less than the pressure applied to the seal by the liquid, causing the seal to separate from the valve body and create a gap. At this time, a small amount of liquid can be discharged through the gap to facilitate the drainage of a small amount of liquid inside the vehicle panel and prevent liquid from accumulating inside the vehicle.

[0025] 3. Through the combination of gravity ball, inclined surface structure and sealing element, no additional external power source is required to control the opening and closing of the valve. The structure is relatively simple, easy to manufacture and maintain, and highly adaptable to the environment. It is especially suitable for harsh conditions such as no electricity or gas source, which reduces manufacturing and maintenance costs. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the gravity-controlled drain valve in an embodiment of this application.

[0027] Figure 2 This is another structural schematic diagram of the gravity-controlled drain valve in the embodiments of this application.

[0028] Figure 3 This is a cross-sectional structural diagram of the gravity-controlled drain valve in an embodiment of this application.

[0029] Figure 4 As in the embodiments of this application Figure 3 Enlarged structural diagram of part A.

[0030] Figure 5 This is another structural schematic diagram of the gravity-controlled drain valve in the embodiments of this application.

[0031] Figure 6 This is a schematic diagram of the gravity-controlled drain valve in the embodiments of this application after installation.

[0032] Marked in the image:

[0033] 1. Valve body; 11. Valve cover; 11a. Outer shell; 11b. Cover body; 11c. Chamfer; 111. Snap-fit; 112. Positioning groove; 12. Liquid inlet; 13. Liquid outlet; 14. Fixing structure; 15. Slot; 16. Sloping structure; 17. Notch; 18. Positioning rib; 19. Cross-sectional structure;

[0034] 2. Gravity ball; 3. Seal; 31. Boss; 32. Pressing part; 33. Receiving groove; 4. Inclined structure; 41. Inclined surface; 5. First sealing ring; 6. Second sealing ring. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only some embodiments of this application, not all embodiments.

[0036] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0037] Please see Figure 1-2 The figure shows the structure of the gravity-controlled drain valve provided in an embodiment of this application.

[0038] This drain valve can be applied to vehicle panels or installed on box-like structures that require drainage. It can drain liquid from inside the vehicle panel or box structure to prevent water accumulation that could damage components.

[0039] The drain valve includes a valve body 1, a gravity ball 2, a seal 3, and an inclined structure 4.

[0040] The valve body 1 has an internal cavity. The valve body 1 includes an inner side and an outer side opposite to the inner side. An inlet 12 is provided on the inner side, and an outlet 13 is provided on the outer side. The outlet 13 can communicate with the inlet 12 through the cavity. The valve body 1 can be made of metals such as aluminum and stainless steel, or materials commonly used in shell structures such as plastic. The specific material used is not limited.

[0041] The inner surface of the valve body 1 can be used for mounting on a vehicle panel or other enclosure structure for installation with the housing of the vehicle panel or other enclosure structure. In one embodiment, a fixing structure 14 can be provided on the inner surface. The fixing structure 14 can be a structure with a snap-fit ​​arm to be fixed to the through hole on the vehicle panel or other enclosure structure by snap-fit. Of course, the fixing structure 14 can be fixed to the vehicle panel or other enclosure structure in various ways, or the fixing structure 14 can be omitted, such as using common valve body 1 fixing methods such as screwing or welding. The implementation method is not limited in this application embodiment.

[0042] Meanwhile, in order to improve the sealing performance of the drain valve with the vehicle panel or other housing structure, a second sealing ring 6 can be provided on the outside of the fixing structure 14. The drain valve can be better sealed and connected with the vehicle panel or other housing structure through the second sealing ring 6.

[0043] The inlet 12 can be circular, rectangular, or other irregular in shape, as long as it allows liquid to enter. The outlet 13 can be located on the outer shell structure. By setting the inlet 12 and outlet 13 and connecting them through the internal cavity of the valve body 1, a drainage channel is constructed. When the drainage valve is opened, liquid inside the vehicle panel or housing structure can be discharged through this drainage channel. Of course, the specific implementation of this drainage channel is not limited, as long as it does not affect the flow of liquid through the drainage channel.

[0044] The gravity ball 2 is located inside the cavity of the valve body 1. Specifically, the gravity ball 2 can be made of metal, plastic or composite materials, and can have a spherical or near-spherical structure. The specific materials and structural form used can be determined according to the actual situation.

[0045] The seal 3 is located between the gravity ball 2 and the inlet 12 to seal the inlet 12. The seal 3 can be a piston with a certain movement mechanism or a similar movable structure, allowing it to move within the cavity of the valve body 1. Alternatively, it can be independent of the valve body 1, its contact with the inlet 12 controlled solely by the gravity ball 2, thus achieving the valve's opening or closing effect. The specific form of the seal 3 can be determined according to the actual situation; for example, a sealing block can be used, as long as the sealing block can effectively seal the inlet 12 through the pressure of the gravity ball 2.

[0046] The inclined structure 4 is located on the other side of the valve body 1 opposite to the seal 3, and has an upward inclined surface 41 on the side facing the gravity ball 2. The closest distance between the inclined surface 41 and the seal 3 is less than the diameter of the gravity ball 2.

[0047] The inclined surface 41 of the inclined structure 4 can be set at an upward angle, and the inclined surface 41 faces the gravity ball 2. The gravity ball 2 can generate a component force acting on the seal 3 through gravity, thereby controlling the seal 3 to seal the liquid inlet 12. Of course, the inclination angle of the inclined surface 41 can be determined according to the actual situation, and this application does not limit it. Furthermore, the closest distance between the inclined surface 41 and the seal 3 is less than the diameter of the gravity ball 2, which can ensure that the gravity ball 2 is located between the inclined surface 41 and the seal 3 and does not fall, thereby improving the reliability of the gravity ball 2 in controlling the seal 3.

[0048] The drain valve may also include a rubber ring 6, which surrounds the outside of the inlet 12. In use, the drain valve is installed on the opening of the vehicle panel or body, with the inner side including the inlet 12. At this time, the drain valve abuts against the outer edge of the opening of the vehicle panel or body through the rubber ring 6, thereby improving the sealing between the drain valve and the vehicle panel or body. Liquid accumulated in the vehicle panel or body can enter through the inlet 12 and contact the seal 3.

[0049] When the gravity ball 2 is located at the lowest point of the inclined plane 41, it simultaneously abuts against both the inclined plane 41 and the sealing element 3, and the sealing element 3 presses against and seals the inlet 12, thereby closing the drain valve. That is, when there is little liquid at the inlet 12, the pressure exerted by the gravity ball 2 on the sealing element 3 is greater than or equal to the pressure exerted by the liquid on the sealing element 3, causing the sealing element 3 to press against the valve body 1 and the inlet 12, thus sealing the inlet 12.

[0050] When the seal 3 is pushed by the liquid and the gravity ball 2 moves towards the high point of the inclined plane 41, the seal 3 can detach from the valve body 1, thereby opening the drain valve. That is, when there is a large amount of liquid at the inlet 12, the pressure exerted by the gravity ball 2 on the seal 3 is less than the pressure exerted by the liquid on the seal 3. At this time, the gravity ball 2 moves away from the seal 3 along the inclined plane structure 4, or has a tendency to move, allowing the seal 3 to be pushed away from the inner surface of the valve body 1 by the liquid. The liquid then flows into the valve body 1 through the gap between the inlet 12, the seal 3, and the inner surface of the valve body 1, and flows out through the outlet 13. When the liquid is discharged and the pressure on the seal 3 at the inlet 12 is less than the pressure exerted by the gravity ball 2 on the seal 3, the gravity ball 2 returns to its original position along the inclined plane structure 4 under the influence of gravity. At this time, by pressing against the seal 3, the inlet 12 returns to a sealed state, thus enabling the drain valve to be reused.

[0051] Understandably, the pressure exerted by the gravity ball 2 on the seal 3 and the pressure exerted by the liquid on the seal 3 can both be considered as forces acting in relative directions. The direction of these forces can be determined by referring to specific force analysis. The "low point" and "high point" of the inclined plane mentioned above are both relative to the direction of gravity; that is, the end closer to the bottom of the drain valve is the low point, and the end farther from the bottom of the drain valve is the high point.

[0052] Furthermore, during vehicle operation, the gravity ball 2 may be affected by vibration, causing it to temporarily cease applying pressure to the seal 3, or the pressure applied to the seal 3 may be less than the pressure applied by the liquid to the seal 3, causing the seal 3 to separate from the valve body 1 and create a gap. At this time, a small amount of liquid can be discharged through the gap. This application utilizes vehicle vibration to actively open the drain valve, facilitating the discharge of small amounts of liquid inside the vehicle panel. This prevents liquid from accumulating inside the vehicle and solves the problem of traditional drain valves failing to completely drain liquid when only a small amount exists inside the vehicle panel, as the valve may not be able to open.

[0053] Furthermore, through the cooperation of gravity ball 2, inclined structure 4 and sealing element 3, no additional external power source is required to control the opening and closing of the valve. The structure is relatively simple, easy to manufacture and maintain, and highly adaptable to the environment. It is especially suitable for harsh conditions such as no electricity or gas source, thus reducing manufacturing and maintenance costs.

[0054] In order to improve the sealing effect of the seal 3 on the liquid inlet 12, in one embodiment, the seal 3 may be provided with a sealing protrusion at the contact point with the inner side of the valve body 1, so as to achieve a better sealing effect on the liquid inlet 12 by using the contact or interference fit between the sealing protrusion and the valve body 1, and to prevent external liquids or foreign objects from entering the vehicle panel or other box structure.

[0055] In another embodiment, a first sealing ring 5 is provided between the seal 3 and the valve body 1. The first sealing ring 5 is disposed on the seal 3 or the valve body 1. The first sealing ring 5 can be used to enhance the sealing effect between the seal 3 and the valve body 1, thereby ensuring the sealing reliability of the seal 3 to the liquid inlet 12. The first sealing ring 5 can be made of materials such as nitrile rubber, silicone, or fluororubber, and the specific material is not limited.

[0056] Alternatively, the seal 3 can use a combination of a sealing protrusion and a first sealing ring 5 to seal the liquid inlet 12, as long as it can achieve the sealing effect.

[0057] Please combine Figure 3 The figure shows a cross-sectional structure of a gravity-controlled drain valve according to an embodiment of this application.

[0058] In one embodiment, the seal 3 includes a boss 31 and a pressing portion 32, the pressing portion 32 being disposed around the boss 31. A first sealing ring 5 is disposed on the side of the pressing portion 32 facing the valve body 1, and the platform of the boss 31 can extend into the liquid inlet 12 and abut against at least a portion of the liquid inlet 12.

[0059] The protrusion 31, which extends into the inlet 12, serves to position the seal 3. Furthermore, at least a portion of the protrusion 31 abuts against the inlet 12, improving its sealing effect. The pressure part 32, by incorporating a first sealing ring 5, abuts against the inner surface of the valve body 1, achieving an even better seal. Specifically, the pressure part 32 can be provided with a groove to accommodate the first sealing ring 5, thus fixing the first sealing ring 5 within the groove for installation.

[0060] In one embodiment, the boss 31 is provided with a receiving groove 33. When the gravity ball 2 abuts against the seal 3, at least a portion of the gravity ball 2 is located within the receiving groove 33. Furthermore, when the seal 3 seals the inlet 12, the gravity ball 2 can abut against the innermost side of the receiving groove 33, allowing the boss 31 to extend into the inlet 12 and seal the inlet 12 through the pressing part 32. It is understood that by providing the receiving groove 33, the receiving groove 33 can guide the gravity ball 2, allowing the component force exerted by the gravity ball 2 on the seal 3 to better seal the inlet 12.

[0061] Furthermore, the valve body 1 has a valve cover 11 on its outer side, and a beveled structure 4 is provided on the valve cover 11. The beveled structure 4 facilitates the manufacturing and installation of the valve cover 11 and the beveled structure 4. The valve cover 11 can be made of materials such as metal or plastic to facilitate the forming of the beveled structure 4 and to protect the valve body 1.

[0062] The outlet 13 can be located at the bottom of the valve cover 11, and the liquid inside the valve body 1 can flow out from the outlet 13 at the bottom of the valve cover 11 by gravity. In one embodiment, the outlet 13 is a strip-shaped opening provided along the edge of the valve cover 11. By designing the outlet 13 as a strip-shaped opening, not only can the efficiency of liquid discharge be ensured, but the narrower width can also prevent foreign objects from entering the interior of the valve body 1, thereby improving the service life of the valve body 1.

[0063] Of course, the width and length of the outlet 13 can be designed according to actual needs, and this application does not limit them.

[0064] In one embodiment, please refer to Figure 3The valve body 1 has a sloped structure 16 for drainage between the inlet 12 and the outlet 13. This sloped structure 16 improves the drainage efficiency of liquid in the drainage channel and prevents accumulation inside the valve body 1. The sloped structure 16 can be located on the side of the inlet 12 near the cavity of the valve body 1, allowing liquid to flow smoothly from the inlet 12 into the cavity of the valve body 1. Alternatively, the sloped structure 16 can also be located at the bottom of the valve body 1 between the inlet 12 and the outlet 13.

[0065] Please combine Figure 4 The figure shows an embodiment of this application. Figure 3 Enlarged structure of section A. To improve drainage efficiency, the valve body 1 has a notch 17 for drainage at the location opposite to the outlet 13. This notch 17 can be stepped, and its bottom is lower than other parts of the valve body 1. When liquid is discharged from inside the valve body 1, it flows more easily into the notch 17 and is less likely to be blocked by the surface tension of the liquid due to the influence of the notch 17.

[0066] In one embodiment, the valve cover 11 may include a housing 11a and a cover body 11b. The inclined structure 4 is integrally formed with or installed with the cover body 11b. The housing 11a can be fixed to the cover body 11b by adhesive or other fixing methods to serve a decorative and protective function.

[0067] To facilitate installation, the valve body 1 may be provided with several positioning ribs 18 inside, and the valve cover 11 may be provided with several positioning grooves 112 that are adapted to the positioning ribs 18 at its edge. The positioning effect of the positioning ribs 18 and the positioning grooves 112 can prevent relative rotation between the valve cover 11 and the valve body 1 due to vibration, thus ensuring the reliability of the structure.

[0068] It should be noted that the positioning rib 18, in addition to positioning the valve cover 11, also guides and positions the seal 3, allowing the seal 3 to slide relative to the positioning rib 18. This facilitates the seal 3's alignment with the inlet 12 for repeated opening and closing. Simultaneously, the positioning rib 18 creates a certain gap between the seal 3 and the valve body 1, ensuring liquid flows through the gap and achieving the drainage function.

[0069] Understandably, the positioning rib 18 can be configured according to actual needs, for example, it can be positioned on both sides near the lower half of the valve body 1. Alternatively, the positioning rib 18 can also be positioned on the valve cover 11, and the positioning groove 112 on the valve body 1, without affecting the functionality. This application does not limit the position of the positioning rib 18 and the positioning groove 112.

[0070] When the valve cover 11 is installed on the valve body 1, a snap fastener 111 can be provided on the side of the valve cover 1 facing the valve body 1. The valve body 1 has an internal slot that matches the snap fastener 111. The valve cover 11 can be snapped and fixed to the valve body 1 through the snap fastener 111. Of course, in addition to snap fastening, the valve cover 11 and the valve body 1 can also be fixed by screwing, gluing, etc. This application does not limit the specific fixing method. When installing the valve cover 11, the positioning groove 112 of the valve cover 11 can be aligned with the positioning rib 18 on the valve body 1, and then the snap fastener 111 can be pushed into the slot of the valve body 1 along the positioning rib 18, so that the valve cover 11 is snapped and fixed to the valve body 1, and it is not easy to separate from the valve body 1.

[0071] Please refer to Figure 5-6 The figure shows another structural schematic diagram of the gravity-controlled drain valve in the embodiment of this application, as well as a structural schematic diagram of its installed structure.

[0072] In another embodiment, for ease of installation, the valve body 1 may also be provided with a faceted structure 19, and the valve cover 11 has a chamfer 11c on one side corresponding to the faceted structure 19 that mates with the faceted structure 19. When the valve cover 11 is installed on the valve body 1, the mating of the chamfer 11c with the faceted structure 19 can prevent mistaken assembly, without the need for a positioning groove 112 that mates with the positioning rib 18. Of course, both the chamfer 11c and the positioning groove 112 can be provided on the valve cover 11 simultaneously, thereby achieving better installation guidance and positioning effects.

[0073] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0074] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "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 commonly used when the utility model product is in use. They are only for the convenience of describing this application 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 application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0075] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0076] In this application, unless otherwise expressly specified and limited, "above or below" a first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" a first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" a first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0077] Although the description of this application has been made in conjunction with the specific embodiments described above, it is obvious to those skilled in the art that many substitutions, modifications, and variations can be made based on the above description. Therefore, all such substitutions, modifications, and variations are included within the spirit and scope of the appended claims.

Claims

1. A gravity control based drain valve, characterized in that, The drain valve comprises: a valve body, an inner cavity of which is formed, the valve body comprising an inner side and an outer side opposite to the inner side, the inner side being provided with a liquid inlet, and the outer side being provided with a liquid outlet, the liquid outlet being in communication with the liquid inlet through the cavity; a gravity ball arranged in the cavity of the valve body; a sealing member arranged between the gravity ball and the liquid inlet for sealing the liquid inlet; a slope structure arranged on the other side of the valve body relative to the sealing member and having an upwardly inclined slope on the side facing the gravity ball, the closest distance between the slope and the sealing member being less than the diameter of the gravity ball; wherein, when the gravity ball is located at the low point of the slope, the gravity ball simultaneously abuts against the slope and the sealing member, and the sealing member is pressed against the liquid inlet to seal the liquid inlet, so that the drain valve is closed; when the sealing member is pushed by liquid and the gravity ball moves towards the high point of the slope, the sealing member can be separated from the valve body, so that the drain valve is opened.

2. The gravity control based drain valve of claim 1, wherein, The valve body is provided with a valve cover at the outer side, and the slope structure is arranged on the valve cover.

3. The gravity control based drain valve of claim 2, wherein, The liquid outlet is located at the bottom of the valve cover, and the liquid outlet is a strip-shaped opening arranged along the edge of the valve cover.

4. The gravity control based drain valve of claim 1, wherein, A first sealing ring is arranged between the sealing member and the valve body, and the first sealing ring is arranged on the sealing member or the valve body.

5. The gravity control based drain valve of claim 4, wherein, The sealing member comprises a boss and a pressing part arranged around the boss; The first sealing ring is arranged on the side of the pressing part facing the valve body, and the top surface of the boss can extend into the liquid inlet and abut against at least part of the liquid inlet.

6. The gravity control based drain valve of claim 5, wherein, The boss is provided with a receiving groove, and at least part of the gravity ball is located in the receiving groove when the gravity ball abuts against the sealing member.

7. The gravity control-based drain valve according to claim 2, wherein: the inner part of the valve body is provided with a plurality of positioning ribs, and the edge of the valve cover is provided with a plurality of positioning grooves matched with the positioning ribs; or the edge of the valve cover is provided with a plurality of positioning ribs, and the inner part of the valve body is provided with a plurality of positioning grooves matched with the positioning ribs.

8. The gravity control based drain valve of claim 2, wherein, The valve body is provided with a facet structure, and the valve cover is provided with a facet angle matched with the facet structure on the side corresponding to the facet structure.

9. A gravity controlled drain valve according to any one of claims 1 to 8, wherein, The valve body is provided with a slope structure for draining water between the liquid inlet and the liquid outlet.

10. A gravity controlled drain valve according to any one of claims 1 to 8, wherein, The valve body is provided with a notch for draining liquid at the side opposite to the liquid outlet.

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