Sealing seat and fluid sealing can

Abstract

A sealing seat (100) and a fluid sealing can (1000). The sealing seat (100) is configured to be mounted in a mounting hole (210) of a can body (200) for storing a fluid. The sealing seat (100) comprises a valve body (10), a valve rod (20) and an operating member (40), wherein the valve body (10) is arranged in the mounting hole (210) in a sealed manner, the valve body (10) has a valve cavity (11), and the valve cavity (11) is in communication with the interior of the can body (200); the valve rod (20) is mounted to the valve cavity (11), and the valve rod (20) has an airflow channel (21); the operating member (40) is connected to the valve rod (20), and the operating member (40) is provided with a communication port (411) in communication with the external environment; and the operating member (40) is configured to be movable relative to the valve body (10) so as to selectively enable the airflow channel (21) to be in communication with the communication port (411) and the valve cavity (11), or enable the airflow channel (21) to be isolated from at least one of the communication port (411) and the valve cavity (11).

Description

Sealing seat and fluid sealing tank

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on March 21, 2024, with application number 202410325621.0, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of paints and coatings, for example, to a sealing seat and a fluid sealing tank. Background Art

[0003] Paint cans are one of the containers we use daily to hold paint. Paint cans and other tanks used to store liquid paint are usually made of relatively strong and corrosion-resistant materials such as tinplate. However, there are some problems with the tank body of conventional paint cans when in use. For example, paint cans cannot usually be used directly. When they are put into actual use such as spraying, the paint stored in the tank body needs to be poured into a specific paint sprayer, and then the paint sprayer needs to be connected to a paint spray gun for spraying. The tank body of the paint can cannot be directly connected to a paint spray gun for use, which makes the use efficiency of the paint can low, resulting in inconvenience in actual use. For another example, the tank body space of an ordinary paint can is closed, and the air inside the tank body cannot be connected to the outside world, resulting in poor fluidity of the paint stored in the tank body. Even if the tank body is directly connected to a paint spray gun for spraying, the spraying effect is not good. Summary of the Invention

[0004] The present application proposes a sealing seat, which can cooperate with a fluid sealing tank with an opening, so as to ensure the sealing of the fluid sealing tank; and when the fluid in the fluid sealing tank needs to be used for spraying, the fluid sealing tank can be connected with the outside world to improve the fluidity of the fluid.

[0005] The present application proposes a fluid sealed tank, which has good sealing properties and can be used as a fluid storage tank; when the fluid sealed tank is used for spraying, the fluid sealed tank can be connected to the outside world, thereby improving the fluidity of the fluid and ensuring the spraying quality.

[0006] The present application provides a sealing seat for installation in a mounting hole of a tank for storing fluid; the sealing seat comprises:

[0007] a valve body, the valve body being configured to be sealed and disposed in the mounting hole, the valve body having a valve cavity, the valve cavity being in communication with the interior of the tank body;

[0008] a valve stem connected to the valve body and having an air flow channel;

[0009] An operating member is connected to the valve stem, and is provided with a communication port connected to the external environment. The operating member can move relative to the valve body to selectively connect the airflow channel with the communication port and the valve cavity, or to isolate the airflow channel from at least one of the communication port and the valve cavity.

[0010] The present application also provides a fluid sealing tank, comprising:

[0011] A tank body, wherein the bottom wall of the tank body is provided with a mounting hole, and the top wall of the tank body is provided with a matching hole;

[0012] The above-mentioned sealing seat is installed in the mounting hole;

[0013] A fixing seat, which is installed at the upper end of the tank body and is used to seal the matching hole. A filling hole is provided on the fixing seat;

[0014] A sealing cover is buckled on the fixing seat and is used to seal the filling hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIG1 is a cross-sectional view of a sealing seat in a closed state according to a first embodiment of the present application;

[0016] FIG2 is a cross-sectional view of the sealing seat in the ventilation state according to the first embodiment of the present application;

[0017] FIG3 is a cross-sectional view of the sealing seat in a closed state according to the second embodiment of the present application;

[0018] FIG4 is a cross-sectional view of the sealing seat in the ventilation state according to the second embodiment of the present application;

[0019] FIG5 is a cross-sectional view of the sealing seat in a closed state according to the third embodiment of the present application;

[0020] FIG6 is a cross-sectional view of the sealing seat in the ventilation state according to the third embodiment of the present application;

[0021] FIG7 is a cross-sectional view of the sealing seat in a closed state according to the fourth embodiment of the present application;

[0022] FIG8 is a cross-sectional view of the sealing seat in the ventilation state according to the fourth embodiment of the present application;

[0023] FIG9 is a cross-sectional view of the sealing seat in a closed state according to the fifth embodiment of the present application;

[0024] FIG10 is a cross-sectional view of the sealing seat in the ventilation state according to the fifth embodiment of the present application;

[0025] FIG11 is a three-dimensional cross-sectional view of a valve stem in a fixed state provided by an embodiment of the present application;

[0026] FIG12 is a schematic structural diagram of a fluid sealing tank according to an embodiment of the present application;

[0027] FIG13 is a schematic diagram of the exploded structure of the fluid sealing tank according to an embodiment of the present application;

[0028] FIG14 is another structural schematic diagram of the fluid sealing tank according to an embodiment of the present application;

[0029] FIG15 is another structural schematic diagram of the fluid sealing tank according to an embodiment of the present application;

[0030] FIG16 is another structural schematic diagram of the fluid sealing tank according to an embodiment of the present application;

[0031] FIG17 is another structural schematic diagram of the fluid sealing tank according to an embodiment of the present application;

[0032] FIG18 is another structural schematic diagram of the fluid sealing tank according to an embodiment of the present application.

[0033] 1. Fluid sealing tank; 100. Sealing seat; 10. Valve body; 11. Valve cavity; 12. Vent hole; 13. First matching portion; 20. Valve stem; 21. Air flow channel; 211. First channel; 212. First hole; 213. Second channel; 214. Second hole; 215. Third hole; 216. Third channel; 22. Stop protrusion; 23. Second matching portion; 30. Inner seal; 31. First sealing ring; 32. Second sealing ring; 321. Air groove; 40. Operating member; 41. Knob; 411. Communication port; 42. Housing; 50. Valve cover; 51. Communication channel; 60. Elastic member; 70. Fixed cover; 80. Outer seal; 90. Sealing gasket; 200. Tank body; 210. Mounting hole; 220. Sealing flange; 230. Matching hole; 300, fixing seat; 310, filling hole; 400, sealing cover. DETAILED DESCRIPTION

[0034] In the description of this application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These are for the purpose of facilitating the description of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation.

[0035] In addition, features defined as "first," "second," or "third" may explicitly or implicitly include one or more of the features, and are used to distinguish and describe features, without regard to order or importance. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0036] In the description of this application, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. A person of ordinary skill in the art will understand the meaning of these terms in this application as appropriate.

[0037] The embodiment of the present application provides a sealing seat, which is installed on a tank body for storing fluid, so that the tank body can not only store the fluid in a sealed manner, but also connect the inside of the tank body with the outside when necessary, so as to ensure the fluidity of the fluid in the tank body and facilitate use. The fluid described herein can be paint or other coatings. The fluid sealed tank described herein can store construction paint, industrial paint, wood paint, latex paint, etc., and can also be used in the coating industry. The tank body described herein can be the tank body of a paint can, or it can be the tank body of a sealed tank for storing other fluids or coatings. In the following embodiments, taking the paint can as an example, after the sealing seat is installed on the tank body of the paint can, the paint in the tank body can be sealed and stored; when the paint can is assembled with the paint spray gun for painting operation, the sealing seat can also achieve communication between the inside and outside of the tank body, ensuring the fluidity of the paint so that the paint can be stably sprayed out of the paint can, thereby improving the spraying quality.

[0038] 1 to 10 , the structural schematic diagrams of the sealing seat 100 according to the embodiment of the present application are described below.

[0039] As shown in Figure 1, the bottom wall of the tank body 200 is provided with a mounting hole 210, into which a sealing seat 100 can be mounted. The sealing seat 100 includes a valve body 10, a valve stem 20, and an operating member 40. The valve body 10 is sealedly connected to the mounting hole 210. The valve body 10 defines a valve cavity 11, which has a vent 12 that communicates with the interior of the tank body 200. The valve stem 20 is connected to the valve body 10 and defines an air flow passage 21. The operating member 40 is mounted on the valve stem 20. The operating member 40 is provided with a communication port 411 that communicates with the external environment. The operating member 40 can move relative to the valve body 10 to selectively connect the communication port 411 with the valve cavity 11 through the air flow passage 21, thereby connecting the interior of the tank body 200 with the exterior, or selectively block the air flow passage 21 from at least one of the communication port 411 and the valve cavity 11, thereby disconnecting the interior of the tank body 200 from the exterior.

[0040] During actual operation, when the communication port 411, the air flow passage 21, and the valve chamber 11 are in a connected state, the interior of the paint can is able to communicate with the external environment, thereby ensuring that the paint stored in the paint can can stably flow out of the paint can's filling hole. When external air cannot enter the paint can through the communication port 411, the air flow passage 21, and the valve chamber 11, the interior of the paint can is isolated from the external environment, and the interior of the paint can is in a relatively closed state, achieving sealed temporary storage of the paint.

[0041] The sealing seat 100 may include various vent structures.

[0042] The first type is shown in Figures 1 to 6. The connecting port 411 is always connected to the air flow channel 21, and the operating member 40 can drive the valve stem 20 to move so that the air flow channel 21 is selectively connected to or isolated from the valve chamber 11. In actual operation, when the paint can is used as a temporary storage device for paint, the air flow channel 21 is isolated from the valve chamber 11, thereby isolating the interior of the paint can from the external environment. When the paint can is installed on the paint spray gun, the operating member 40 drives the valve stem 20 to move. The valve stem 20 can move to a position that connects the air flow channel 21 with the valve chamber 11, and the interior of the paint can is connected to the external environment. At this time, the paint stored in the paint can has good fluidity, thereby ensuring high-quality spraying using the paint spray gun.

[0043] The second type, as shown in Figures 7-10, is that the airflow channel 21 is always connected to the valve chamber 11. When the operating member 40 moves relative to the valve stem 20, the communication port 411 can be connected to or blocked from the airflow channel 21. In actual operation, when the paint can is used as a temporary storage device for paint, the airflow channel 21 is blocked from the communication port 411, thereby isolating the interior of the paint can from the external environment. When the paint can is installed on the paint spray gun, the operating member 40 can move to a position that connects the airflow channel 21 with the communication port 411, connecting the interior of the paint can to the external environment. At this time, the paint stored in the paint can has good fluidity, thereby ensuring high-quality spraying using the paint spray gun.

[0044] A third possibility is that the movement of the operating member 40 not only drives the valve stem 20 to move, connecting the airflow channel 21 in the valve stem 20 with the valve cavity 11, but also enables the movement of the operating member 40 to connect the connecting port 411 with the airflow channel 21. In actual operation, when the paint can is used as a temporary storage device for paint, the airflow channel 21 is not connected to the connecting port 411, and the airflow channel 21 is also not connected to the valve cavity 11, thereby isolating the interior of the paint can from the external environment. When the paint can is installed on the paint spray gun, the operating member 40 can move to a position that connects the airflow channel 21 with the connecting port 411. At the same time, the operating member 40 can drive the valve stem 20 to move to a position that connects the airflow channel 21 with the valve cavity 11, connecting the interior of the paint can with the external environment. At this time, the paint stored in the paint can has good fluidity, thereby ensuring high-quality spraying using the paint spray gun.

[0045] In some embodiments, as shown in Figures 1 and 2, the first end of the valve stem 20 extends into the valve cavity 11, and the second end of the valve stem 20 is connected to the operating member 40. For ease of description, the first end of the valve stem 20 extending into the valve cavity 11 is the lower end, and the second end of the valve stem 20 connected to the operating member 40 is the upper end. The inlet end of the airflow channel 21 is located at the upper end of the valve stem 20, and the inlet end is directly opposite and connected to the connecting port 411 on the operating member 40, so that the connecting port 411 and the airflow channel 21 are always connected. The outlet end of the airflow channel 21 is located at the lower end of the valve stem 20, and the outlet end is configured to communicate with the valve cavity 11. In actual use, the outlet end can be connected to the valve cavity 11 as needed, thereby connecting the connecting port 411 and the valve cavity 11 through the airflow channel 21, so that the interior and exterior of the tank body 200 are connected.

[0046] In some embodiments, the valve cavity 11 extends through the valve body 10 along the axial direction of the valve stem 20 to form a vent hole 12 on the bottom surface of the valve body 10. The vent hole 12 communicates with the interior of the tank body 200. The valve cavity 11 forms an opening on the top surface of the valve body 10. The valve stem 20 can extend into the valve cavity 11 through the opening and can slide within the valve cavity 11 along the axial direction of the valve stem 20. An operating member 40 is provided at the upper end of the valve stem 20. By pressing the operating member 40, the valve stem 20 can be driven to move along the axial direction of the valve stem 20 to selectively connect or block the outlet end of the airflow channel 21 with the valve cavity 11.

[0047] In some embodiments, the sealing seat 100 may also include an inner seal 30, which is sleeved on the valve stem 20 to seal the outlet end of the air flow channel 21; and the inner seal 30 is arranged around the opening on the top surface of the valve body 10 and abuts against the top surface of the valve body 10 to seal the connection position between the valve body 10 and the valve stem 20.

[0048] As shown in Figure 1, the communication port 411 is always connected to the air flow channel 21. The inner seal 30 is sleeved on the lower end of the valve stem 20 and blocks the outlet end of the air flow channel 21, so that the air flow channel 21 and the valve cavity 11 are in a partitioned state, thereby isolating the interior of the paint can from the external environment.

[0049] As shown in Figure 2, by pressing the operating part 40, the valve stem 20 can be driven to slide into the valve cavity 11, and the lower end of the valve stem 20 can pass through the inner seal 30 and move into the valve cavity 11, so that the outlet end of the air flow channel 21 can be separated from the seal of the inner seal 30 and connected to the valve cavity 11.

[0050] When the paint can is used as a temporary storage device for paint, the outlet end of the airflow channel 21 is sealed by the inner seal 30, isolating the airflow channel 21 from the valve chamber 11, thereby isolating the interior of the paint can from the external environment. After the paint spray gun is installed on the top of the paint can, pressing the operating member 40 drives the valve stem 20 to move. The valve stem 20 can move to a position where the outlet end of the airflow channel 21 is no longer sealed by the inner seal 30. At this point, the airflow channel 21 is connected to the valve chamber 11, thereby connecting the interior of the paint can to the external environment.

[0051] As shown in Figures 1 and 2, the operating member 40 is fixedly mounted on the upper end of the valve stem 20, and the communication port 411 is located on the top surface of the operating member 40. The airflow channel 21 includes a first channel 211 extending axially along the valve stem 20 and a first hole 212 extending radially through the valve stem 20. The upper end of the first channel 211 passes through the top end surface of the valve stem 20 to communicate with the communication port 411. The first hole 212 radially extends to the outer peripheral surface of the valve stem 20 to form the outlet end of the airflow channel 21. When the operating member 40 is pressed to drive the valve stem 20 downward, the first hole 212 can break away from the inner seal 30 and enter the valve cavity 11, thereby releasing the seal on the first hole 212 and allowing the first channel 211 to communicate with the valve cavity 11 through the first hole 212.

[0052] When the paint can is used as a temporary storage device for paint, as shown in FIG1 , the first hole 212 is provided corresponding to the inner seal 30. The inner seal 30 blocks the first hole 212, thereby isolating the first channel 211 from the valve chamber 11, thereby isolating the interior of the paint can from the external environment. When the paint can is mounted on the paint spray gun, the operating member 40 is pressed to drive the valve stem 20 downward. As shown in FIG2 , the first hole 212 moves to a position offset from the inner seal 30. The inner seal 30 no longer seals the first hole 212, and the first channel 211 communicates with the valve chamber 11 through the first hole 212, thereby communicating with the interior of the paint can from the external environment.

[0053] The first hole 212 can move with the valve stem 20 to a position where it is completely exposed and blocked by the inner seal 30, that is, the first hole 212 is fully open; or, based on the requirements for paint fluidity during painting, the first hole 212 can be partially not blocked by the inner seal 30. Both of the above methods can achieve communication between the inside and outside of the tank body 200.

[0054] As shown in Figures 1 and 2, the first hole 212 penetrates the valve stem 20 along the radial direction of the valve stem 20, so that after the external gas enters the air flow channel 21, it can enter the valve cavity 11 through both ends of the first hole 212 to increase the flow rate of gas inside and outside the tank body 200.

[0055] Optionally, the number of the first holes 212 can be set to one, or can be set to at least two, so as to increase the flow rate of gas inside and outside the tank body 200 .

[0056] In some embodiments, as shown in Figures 3 and 4, the upper end of the valve stem 20 is fixedly connected to the operating member 40. The airflow channel 21 includes a second channel 213 extending axially along the valve stem 20 and a second hole 214 extending radially from the inner wall of the valve stem 20 to the outer peripheral wall. The second hole 214 is connected to the second channel 213 and forms the outlet end of the airflow channel 21. The bottom wall of the inner seal 30 is provided with a plurality of air grooves 321 connected to the valve cavity 11. The air grooves 321 open toward the bottom surface and radial center of the valve cavity 11. Pressing the operating member 40 drives the valve stem 20 downward, and rotating the operating member 40 drives the valve stem 20 to rotate. The second hole 214 can be connected to the air groove 321, so that the second hole 214 is separated from the seal of the inner seal 30.

[0057] When the air flow channel 21 is not connected to the valve cavity 11, the air groove 321 and the second hole 214 are arranged at intervals along the axial direction of the valve stem 20, that is, the air groove 321 and the second hole 214 have different heights, and the air groove 321 and the second hole 214 are staggered along the circumference of the valve stem 20.

[0058] Optionally, the number of second holes 214 can be one or at least two. When there are at least two second holes 214, the at least two second holes 214 are spaced apart along the circumference of the valve stem 20 to increase the number of venting locations and increase the flow of gas inside and outside the tank body 200. The number of air grooves 321 can be the same as the number of second holes 214, and they can be arranged in a one-to-one correspondence, such that each air groove 321 corresponds to a second hole 214; alternatively, the number of air grooves 321 can be different from the number of second holes 214, and the air grooves 321 can extend along the circumference of the inner seal 30, such that each air groove 321 can communicate with at least two second holes 214.

[0059] In some embodiments, as shown in Figures 3 and 4, the number of second holes 214 can be two. The angle between the two second holes 214 can be any angle; optionally, the angle between the two second holes 214 is any angle between 60° and 120°, which can be 60°, 70°, 90°, 120°, etc. The angle between the two second holes 214 in Figures 3 and 4 is approximately 70°. The air grooves 321 are two air grooves 321 corresponding one to one with the second holes 214, and the cross-sectional views of Figures 3 and 4 show one of the air grooves 321. In some embodiments, the air groove 321 can be an extended groove, which is an extended groove with a central angle of 80° and can be connected to the two second holes 214.

[0060] When the paint can is used as a temporary storage device for paint, as shown in FIG3 , the second hole 214 is provided corresponding to the inner seal 30 . The second hole 214 is located above the air groove 321 and offset from the air groove 321 . The inner seal 30 blocks the second hole 214 , thereby isolating the second passage 213 from the valve chamber 11 , thereby isolating the interior of the paint can from the external environment. When the paint can is mounted on the paint spray gun, the operating member 40 is first pressed to move the valve stem 20 downward. In the vertical direction, the second hole 214 and the air groove 321 are on the same circumference. At this time, the second hole 214 and the air groove 321 are offset along the circumference of the valve stem 20 . Then, the operating member 40 is rotated to drive the valve stem 20 to rotate, causing the second hole 214 to rotate to a position corresponding to the air groove 321 (see FIG4 ). At this time, the inner seal 30 no longer seals the second hole 214, and the second passage 213 is connected to the valve chamber 11 , thereby connecting the interior of the paint can to the external environment. In this embodiment, it is necessary to first press the operating member 40 and then rotate the operating member 40 to achieve ventilation inside the paint can.

[0061] In other embodiments, when the air flow channel 21 is not connected to the valve cavity 11, the air groove 321 and the second hole 214 are spaced apart and arranged opposite each other along the axial direction of the valve stem 20. In other words, the second hole 214 is located directly above the air groove 321. When the air flow channel 21 needs to be connected to the valve cavity 11, the second hole 214 can be connected to the air groove 321 by simply pressing the operating member 40 to move the valve stem 20 downward. There is no need to rotate the operating member 40, which simplifies operation.

[0062] In other embodiments, when the air flow channel 21 is not connected to the valve cavity 11, the air groove 321 and the second hole 214 are located on the same circumference and are staggered along the circumference of the valve stem 20. When the air flow channel 21 needs to be connected to the valve cavity 11, the second hole 214 can be connected to the air groove 321 by simply rotating the operating member 40 to drive the valve stem 20, without pressing the operating member 40, which simplifies operation.

[0063] When a paint can is mounted on a paint spray gun, the interior of the can body 200 must remain connected to the exterior to ensure high-quality paint. To maintain the valve stem 20 in a position where the airflow channel 21 communicates with the valve cavity 11, as shown in Figure 11, a first mating portion 13 is provided on the inner sidewall of the valve cavity 11, and a second mating portion 23 is provided on the outer sidewall of the valve stem 20. The first mating portion 13 engages with the second mating portion 23 to secure the valve stem 20 in the position where the airflow channel 21 communicates with the valve cavity 11.

[0064] In some embodiments, one of the first mating portion 13 and the second mating portion 23 is a protrusion, and the other is a groove. When the valve stem 20 is moved to a position that connects the airflow channel 21 with the valve cavity 11, the protrusion and the groove are aligned, and the protrusion can be snapped into the groove to secure the valve stem 20. The protrusion is a relatively small raised structure that not only does not interfere with the movement of the valve stem 20 but can be disengaged from the groove by applying a small force to the valve stem 20. Furthermore, there is a noticeable click when the protrusion is snapped into the groove, which serves as a reminder of the operation.

[0065] Optionally, the number of the protrusion and the number of the groove can be set to one, or can be set to at least two, so as to adjust the fixing effect on the valve stem 20.

[0066] In some embodiments, the first fitting part 13 and the second fitting part 23 can be fixed by adsorption. For example, the first fitting part 13 and the second fitting part 23 are magnets with opposite magnetic properties, or one of the first fitting part 13 and the second fitting part 23 is a magnet and the other is a metal block that can be adsorbed by the magnet.

[0067] Optionally, the first matching portion 13 can be embedded in the inner circumferential wall of the valve cavity 11, and the second matching portion 23 can be embedded in the outer circumferential surface of the valve stem 20, which can fix the valve stem 20 while avoiding interfering with the movement of the valve stem 20.

[0068] In some embodiments, as shown in FIG11 , the first engaging portion 13 may be a first latching protrusion 13, and the second engaging portion 23 may be a second latching protrusion 23. The inner sidewall of the valve cavity 11 has first latching protrusions 13 spaced apart along the circumference of the valve cavity 11, and the outer sidewall of the valve stem 20 has second latching protrusions 23 spaced apart along the circumference of the valve stem 20. When the operating member 40 drives the valve stem 20 to move, the second latching protrusion 23 can move to a position corresponding to the first latching protrusion 13. The abutment between the first latching protrusion 13 and the second latching protrusion 23 secures the position of the valve stem 20. Optionally, the second latching protrusion 23 can move with the valve stem 20 to below the first latching protrusion 13 and abut against it. In this case, the first latching protrusion 13 exerts a downward force on the second latching protrusion 23, preventing the valve stem 20 from moving upward, thereby maintaining the valve stem 20 in a position that connects the airflow channel 21 with the valve cavity 11.

[0069] In this embodiment, the matching structure of Figure 11 is adopted. When the valve stem 20 is driven to rotate by rotating the operating member 40 or the valve stem 20 is driven to move downward and then rotate by the operating member 40, the second latch 23 can move to a position corresponding to the first latch 13. At this time, the valve stem 20 can be maintained in the specified position under the limiting cooperation of the first latch 13 and the second latch 23, ensuring that the interior of the paint can is always connected to the external environment, so that the interior of the paint can can be kept ventilated during the painting process.

[0070] In some embodiments, as shown in Figures 5 and 6 , the airflow channel 21 includes a third channel 216 extending axially along the valve stem 20 and a third hole 215 extending radially through the valve stem 20. The third hole 215 serves as the outlet of the airflow channel 21. The third hole 215 is a through hole extending radially along the valve stem 20 toward the back of the paper in Figures 5 and 6 . The upper end of the third channel 216 is connected to the communication port 411. The operating member 40 includes a housing 42 and a knob 41. The housing 42 is hermetically connected to the can body 200. The knob 41 is threadedly connected to the housing 42 and is connected to the upper end of the valve stem 20. When the knob 41 is turned to rotate the valve stem 20 downward, the third hole 215 can break free from the seal of the inner seal 30 and connect to the valve chamber 11.

[0071] When the paint can is used as a temporary storage device for paint, as shown in FIG5 , the third hole 215 is provided corresponding to the inner seal 30. The inner seal 30 blocks the third hole 215, thereby isolating the third channel 216 from the valve chamber 11, thereby isolating the interior of the paint can from the external environment. When the paint can is installed on the paint spray gun, the knob 41 is turned. Since the knob 41 is threadedly connected to the housing 42, the knob 41 will also move downward during the rotation, thereby causing the valve stem 20 to also move downward. As shown in FIG6 , the third hole 215 moves to a position offset from the inner seal 30. The inner seal 30 no longer seals the third hole 215, and the third channel 216 is connected to the valve chamber 11, thereby connecting the interior of the paint can to the external environment.

[0072] In some embodiments, the knob 41 can be fixedly connected to the valve stem 20. When the knob 41 is rotated, the knob 41 drives the valve stem 20 to rotate and, at the same time, drives the valve stem 20 downward. This structure can be applied not only to a sealing seat 100 in which the operating member 40 drives the valve stem 20 downward to connect the airflow channel 21 with the valve cavity 11, but also to a sealing seat 100 in which the operating member 40 drives the valve stem 20 downward to move and rotate to connect the airflow channel 21 with the valve cavity 11.

[0073] In some embodiments, the knob 41 may also be rotatably connected to the valve stem 20. When the knob 41 is rotated, the knob 41 only drives the valve stem 20 downward. This structure can be applied to a sealing seat 100 in which the operating member 40 only drives the valve stem 20 downward to connect the airflow channel 21 with the valve cavity 11.

[0074] In some embodiments, as shown in Figures 7 to 10, the airflow channel 21 penetrates the valve stem 20 along the axial direction of the valve stem 20, and the airflow channel 21 forms an outlet end at the lower end surface of the valve stem 20, which can be directly connected to the valve cavity 11, that is, the airflow channel 21 and the valve cavity 11 are always connected; the sealing seat 100 also includes a valve cover 50, which is fixedly connected to the upper end of the valve stem 20, and the valve cover 50 has a communication channel 51, which is connected to the airflow channel 21; the operating member 40 is rotatably mounted on the valve cover 50, and when the operating member 40 is rotated, the communication port 411 can be connected to the communication channel 51. In some embodiments, the operating member 40 and the valve cover 50 are sealed. This sealing connection can be achieved by providing a sealing gasket 90 between the operating member 40 and the valve cover 50.

[0075] When the paint can is used as a temporary storage device for paint, as shown in Figures 7 and 9 , the communication port 411 is staggered with the communication channel 51, isolating the communication channel 51 from the external environment. Since the communication channel 51 is connected to the airflow channel 21, the airflow channel 21 is now isolated from the external environment, thereby isolating the interior of the paint can from the external environment. When the paint can is mounted on the paint spray gun, as shown in Figures 8 and 10 , the operating member 40 is rotated to connect the communication port 411 with the communication channel 51. The operating member 40 no longer seals the communication channel 51, thereby allowing the interior of the paint can to communicate with the external environment.

[0076] In some embodiments, as shown in Figures 7 and 8, the connecting channel 51 is an L-shaped channel, and the connecting port 411 is provided on the outer peripheral wall of the operating member 40. The vertical section of the L-shaped channel is always connected to the airflow channel 21. When the operating member 40 is rotated, the horizontal section of the L-shaped channel can be connected to or not connected to the connecting port 411.

[0077] In some embodiments, as shown in Figures 9 and 10, a communication port 411 is provided on the top surface of the operating member 40, and the communication port 411 is eccentrically disposed relative to the rotation center of the operating member 40. The operating member 40 rotates about the axis of the valve stem 20, that is, the communication port 411 is offset from the axis of the valve stem 20. As shown in Figures 9 and 10, in the illustrated direction, the communication channel 51 includes a first vertical segment, a horizontal segment, and a second vertical segment, which are sequentially connected from bottom to top. The communication port 411 is provided on the top wall of the operating member 40. The first vertical segment is always in communication with the airflow channel 21. When the operating member 40 is rotated, the second vertical segment can communicate with the communication port 411.

[0078] In some embodiments, as shown in FIG1 , the sealing seat 100 further includes an elastic member 60 disposed within the valve cavity 11 and elastically connecting the valve stem 20 and the valve body 10. The elastic force exerted by the elastic member 60 on the valve stem 20 can propel the valve stem 20 toward the operating member 40. The provision of the elastic member 60 can assist in resetting the valve stem 20 toward the operating member 40. Furthermore, the elastic member 60 can push the valve stem 20 to squeeze the inner seal 30, thereby improving the sealing effect.

[0079] Optionally, as shown in Figures 1-4 and 11 , an elastic member 60 is sleeved onto the valve stem 20 , which is provided with a stop protrusion 22 . The first end of the elastic member 60 abuts against the bottom wall of the valve cavity 11 , while the second end of the elastic member 60 abuts against the stop protrusion 22 . The elastic member 60 sleeves onto the valve stem 20, guiding the elastic member 60 through the valve stem 20 to prevent bending of the elastic member 60 during compression, which could cause a shift in the direction of the elastic force. When the spray gun is finished using the spray gun, the elastic member 60 automatically resets the valve stem 20, making it easier for the user to operate the sealing seat 100.

[0080] In some embodiments, as shown in FIG1 , the sealing seat 100 further includes a fixed cover 70 and an outer seal 80 surrounding the valve body 10 and valve stem 20. The fixed cover 70 is sealingly connected to the mounting hole 210, and the outer seal 80 is sandwiched between the fixed cover 70 and the can body 200 to seal the assembly gap between the fixed cover 70 and the can body 200. Optionally, a sealing flange 220 is provided on the paint can surrounding the mounting hole 210. The edge of the fixed cover 70 is placed on the sealing flange 220, and the outer seal 80 is located between the fixed cover 70 and the sealing flange 220. An inner seal 30 is sandwiched between the fixed cover 70 and the valve body 10, and between the fixed cover 70 and the valve stem 20.

[0081] As shown in Figure 1, the inner seal 30 includes a first sealing ring 31 and a second sealing ring 32 that are connected to each other. The first sealing ring 31 is sleeved on the valve stem 20 and clamped between the valve stem 20 and the fixed cover 70 to achieve a sealed connection between the fixed cover 70 and the valve stem 20; the second sealing ring 32 is clamped between the connection between the fixed cover 70 and the valve body 10 and the valve stem 20 to achieve a sealed connection between the fixed cover 70 and the valve body 10, and between the valve stem 20 and the valve body 10.

[0082] After the seal seat 100 is assembled, the outer seal 80 forms a first seal, the first sealing ring 31 forms a second seal, and the second sealing ring 32 forms a third seal. This three-way seal provides a sealed connection between the seal seat 100 and the paint can, ensuring a good seal between the seal seat 100 and the paint can.

[0083] Example 1:

[0084] As shown in Figures 1, 2, and 11, the sealing seat 100 includes a valve body 10, a valve stem 20, an inner seal 30, an operating member 40, an elastic member 60, a fixed cover 70, and an outer seal 80. The fixed cover 70 is sealed to the mounting hole 210. A sealing flange 220 is provided on the tank body 200 surrounding the mounting hole 210. The outer seal 80 is sandwiched between the fixed cover 70 and the sealing flange 220. The inner seal 30 includes a first sealing ring 31 and a second sealing ring 32. The first sealing ring 31 is sandwiched between the valve stem 20 and the fixed cover 70 to achieve a sealed connection between the valve stem 20 and the fixed cover 70. The second sealing ring 32 is sandwiched between the fixed cover 70 and the connection between the valve body 10 and the valve stem 20 to achieve a sealed connection between the valve stem 20 and the valve body 10, and between the valve body 10 and the fixed cover 70. The valve body 10 has a valve chamber 11 with a vent 12 communicating with the interior of the paint can. The lower end of the valve stem 20 is mounted in the valve chamber 11. The valve stem 20 has an airflow passage 21. The upper end of the valve stem 20 is fixedly connected to an operating member 40, which has a communication port 411 communicating with the external environment. The airflow passage 21 includes a first channel 211 extending axially along the valve stem 20 and a first hole 212 extending radially through the valve stem 20. The upper end of the first channel 211 communicates with the communication port 411. The inner sidewall of the valve chamber 11 has first latching protrusions 13 spaced apart along the circumference of the valve chamber 11, and the outer sidewall of the valve stem 20 has second latching protrusions 23 spaced apart along the circumference of the valve stem 20. The elastic member 60 is sleeved on the valve stem 20 . The valve stem 20 is provided with a stop protrusion 22 . The first end of the elastic member 60 abuts against the bottom wall of the valve cavity 11 , and the second end of the elastic member 60 abuts against the stop protrusion 22 .

[0085] The ventilation and sealing process of the sealing seat 100 of this embodiment is as follows: when the paint can is used as a temporary storage device for paint, the first hole 212 is provided corresponding to the inner seal 30. The inner seal 30 blocks the first hole 212, thereby isolating the first channel 211 from the valve cavity 11, thereby isolating the interior of the paint can from the external environment. When the paint can is installed on the paint spray gun, the operating member 40 is pressed to drive the valve stem 20 downward. When the first hole 212 moves to a position offset from the inner seal 30, the inner seal 30 no longer seals the first hole 212, and the first channel 211 is connected to the valve cavity 11. The operating member 40 is then rotated to drive the valve stem 20 to rotate, causing the second latch 23 to move to the position corresponding to the first latch 13, thereby fixing the valve stem 20 in the position where the air flow channel 21 is connected to the valve cavity 11. When resealing is required, the operating member 40 only needs to be rotated to offset the first locking protrusion 13 and the second locking protrusion 23 , and then the operating member 40 is released. The valve stem 20 can rebound to its initial position under the action of the elastic member 60 .

[0086] Example 2:

[0087] 3, 4, and 11, the sealing seat 100 includes a valve body 10, a valve stem 20, an inner seal 30, an operating member 40, an elastic member 60, a fixed cover 70, and an outer seal 80. The fixed cover 70 is sealed to the mounting hole 210. A sealing flange 220 is provided on the tank body 200 around the mounting hole 210. The outer seal 80 is sandwiched between the fixed cover 70 and the sealing flange 220. The inner seal 30 includes a first sealing ring 31 and a second sealing ring 32. The first sealing ring 31 is sandwiched between the valve stem 20 and the fixed cover 70 to achieve a sealed connection between the valve stem 20 and the fixed cover 70. The second sealing ring 32 is sandwiched between the fixed cover 70 and the connection between the valve body 10 and the valve stem 20 to achieve a sealed connection between the valve stem 20 and the valve body 10, and between the valve body 10 and the fixed cover 70. The valve body 10 has a valve cavity 11 with a vent 12 communicating with the interior of the paint can. The lower end of the valve stem 20 is mounted in the valve cavity 11. The valve stem 20 has an airflow passage 21. The upper end of the valve stem 20 is fixedly connected to the operating member 40, which has a communication port 411 communicating with the external environment. The airflow passage 21 includes a second channel 213 extending axially along the valve stem 20 and a plurality of second holes 214 spaced apart circumferentially around the valve stem 20. Each second hole 214 communicates with the second channel 213, and the upper end of the second channel 213 communicates with the communication port 411. The bottom wall of the second sealing ring 32 is provided with a plurality of air grooves 321 communicating with the valve cavity 11. The air grooves 321 extend through the inner annular surface of the inner seal 30. Pressing the operating member 40 drives the valve stem 20 downward, and rotating the operating member 40 drives the valve stem 20 rotationally, allowing the second hole 214 to communicate with the air groove 321, thereby releasing the second hole 214 from the seal of the inner seal 30. The inner sidewall of the valve cavity 11 has first retaining protrusions 13 spaced apart along the circumference of the valve cavity 11, and the outer sidewall of the valve stem 20 has second retaining protrusions 23 spaced apart along the circumference of the valve stem 20. The elastic member 60 is sleeved on the valve stem 20, and the valve stem 20 is provided with a stop protrusion 22. The first end of the elastic member 60 abuts against the bottom wall of the valve cavity 11, and the second end of the elastic member 60 abuts against the stop protrusion 22.

[0088] The ventilation and sealing process of the sealing seat 100 of this embodiment is as follows: when the paint can is used as a temporary storage device for paint, the second hole 214 is provided corresponding to the inner seal 30. The inner seal 30 blocks the second hole 214, thereby isolating the second channel 213 from the valve cavity 11, thereby isolating the interior of the paint can from the external environment. After the paint can is installed on the paint spray gun, the operating member 40 is first pressed to drive the valve stem 20 downward. When the second hole 214 and the air groove 321 are on the same circumference in the vertical direction, the operating member 40 is then rotated to drive the valve stem 20 to rotate, so that the second hole 214 rotates to a position corresponding to the air groove 321. At this time, the second channel 213 and the valve cavity 11 are connected through the second hole 214 and the air groove 321, thereby connecting the interior of the paint can with the external environment. At the same time, the second latch 23 moves to the position corresponding to the first latch 13, thereby fixing the valve stem 20 in the position where the air flow channel 21 is connected to the valve cavity 11. When resealing is required, the operating member 40 only needs to be rotated to offset the first locking protrusion 13 and the second locking protrusion 23 , and then the operating member 40 is released. The valve stem 20 can rebound to its initial position under the action of the elastic member 60 .

[0089] Example 3:

[0090] As shown in Figures 5, 6, and 11, the sealing seat 100 includes a valve body 10, a valve stem 20, an inner seal 30, an operating member 40, an elastic member 60, a fixed cover 70, and an outer seal 80. The fixed cover 70 is sealed to the mounting hole 210. A sealing flange 220 is provided on the tank body 200 surrounding the mounting hole 210. The outer seal 80 is sandwiched between the fixed cover 70 and the sealing flange 220. The inner seal 30 includes a first sealing ring 31 and a second sealing ring 32. The first sealing ring 31 is sandwiched between the valve stem 20 and the fixed cover 70 to achieve a sealed connection between the valve stem 20 and the fixed cover 70. The second sealing ring 32 is sandwiched between the fixed cover 70 and the connection between the valve body 10 and the valve stem 20 to achieve a sealed connection between the valve stem 20 and the valve body 10, and between the valve body 10 and the fixed cover 70. The valve body 10 has a valve cavity 11, which has a vent hole 12 communicating with the interior of the can body 200. The valve stem 20 is mounted in the valve cavity 11. The valve stem 20 has an airflow channel 21, which includes a third channel 216 extending axially along the valve stem 20 and a third hole 215 extending radially through the valve stem 20. The upper end of the third channel 216 is connected to the communication port 411 of the operating member 40. The operating member 40 includes a housing 42 and a knob 41. The housing 42 is sealed to the paint can. The knob 41 is threadedly connected to the housing 42 and is connected to the upper end of the valve stem 20. An elastic member 60 is sleeved on the valve stem 20. The valve stem 20 is provided with a stop protrusion 22. The first end of the elastic member 60 abuts against the bottom wall of the valve cavity 11, and the second end of the elastic member 60 abuts against the stop protrusion 22.

[0091] The ventilation and sealing process of the sealing seat 100 of this embodiment is as follows: When the paint can is used as a temporary storage device for paint, the third hole 215 is arranged corresponding to the inner seal 30. The inner seal 30 blocks the third hole 215, thereby isolating the third channel 216 from the valve chamber 11, thereby isolating the interior of the paint can from the external environment. When the paint can is installed on the paint spray gun, turning the knob 41 causes the valve stem 20 to move downward, and the third hole 215 moves to a position offset from the inner seal 30. The inner seal 30 no longer seals the third hole 215, and the third channel 216 is connected to the valve chamber 11, thereby connecting the interior of the paint can to the external environment. When resealing is required, simply turn the knob 41, and the valve stem 20 will follow the knob 41 back to its initial position.

[0092] Example 4:

[0093] 7-8 , the sealing seat 100 includes a valve body 10, a valve stem 20, an inner seal 30, an operating member 40, an elastic member 60, a fixed cover 70, an outer seal 80, and a valve cover 50. The fixed cover 70 is sealed to the mounting hole 210. A sealing flange 220 is provided on the tank body 200 around the mounting hole 210. The outer seal 80 is sandwiched between the fixed cover 70 and the sealing flange 220. The inner seal 30 includes a first sealing ring 31 and a second sealing ring 32. The first sealing ring 31 is sandwiched between the valve stem 20 and the fixed cover 70 to achieve a sealed connection between the valve stem 20 and the fixed cover 70. The second sealing ring 32 is sandwiched between the fixed cover 70 and the connection between the valve body 10 and the valve stem 20 to achieve a sealed connection between the valve stem 20 and the valve body 10, and between the valve body 10 and the fixed cover 70. The valve body 10 has a valve cavity 11, which has a vent 12 that communicates with the interior of the paint can. The valve stem 20 is mounted in the valve cavity 11 and has an air flow passage 21 that extends axially through the valve stem 20. The valve cover 50 is fixedly connected to the upper end of the valve stem 20 and has a communication passage 51 that connects to the air flow passage 21. The communication passage 51 is an L-shaped passage, with a communication port 411 provided on the outer peripheral wall of the operating member 40. The vertical section of the L-shaped passage is always in communication with the air flow passage 21. A sealing gasket 90 is provided between the valve cover 50 and the operating member 40.

[0094] The ventilation and sealing process of the sealing seat 100 of this embodiment is as follows: When the paint can is used as a temporary storage device for paint, the communication port 411 and the communication channel 51 are staggered, so that the communication channel 51 is isolated from the external environment. Since the communication channel 51 is connected to the air flow channel 21, the air flow channel 21 is now isolated from the external environment, thereby isolating the interior of the paint can from the external environment. When the paint can is installed on the paint spray gun, the operating member 40 is rotated to connect the communication port 411 with the communication channel 51. At this time, the operating member 40 no longer seals the communication channel 51, thereby connecting the interior of the paint can with the external environment. When resealing is required, it is only necessary to rotate the operating member 40 so that the communication port 411 on the operating member 40 is staggered with the communication channel 51 to block the connection between the interior and the exterior of the paint can.

[0095] Embodiment 5:

[0096] As shown in Figures 9 and 10 , the structure of the sealing seat 100 of this embodiment is substantially identical to that of the sealing seat 100 of the fourth embodiment, except that the communication port 411 is eccentrically positioned on the top wall of the operating member 40. The communication passage 51 of the valve cover 50 comprises, sequentially from bottom to top, a first vertical section, a horizontal section, and a second vertical section. The first vertical section is always in communication with the airflow passage 21, and upon rotation of the operating member 40, the second vertical section can communicate with the communication port 411. The ventilation and sealing operations are generally identical to those of the fourth embodiment and will not be further described here.

[0097] The present application also discloses a fluid-sealed tank 1000, as shown in Figures 12 and 13. The fluid-sealed tank 1000 includes a tank body 200, a fixing seat 300, a sealing cover 400, and any one of the sealing seats 100 disclosed above in the present application. The bottom wall of the tank body 200 is provided with a mounting hole 210, the top wall of the tank body 200 is provided with a matching hole 230, the sealing seat 100 is mounted in the mounting hole 210, the fixing seat 300 is mounted on the upper end of the tank body 200, the fixing seat 300 is configured to seal the matching hole 230, the fixing seat 300 is provided with a filling hole 310, and the sealing cover 400 is snapped onto the fixing seat 300 to seal the filling hole 310 on the fixing seat 300.

[0098] As shown in Figures 14-16, in some embodiments, at least a portion of the outer wall of the sealing cover 400 is provided with an anti-slip structure to facilitate the user's twisting of the sealing cover 400. For example, as shown in Figures 14 and 15, a plurality of anti-slip grooves or anti-slip protrusions spaced along the circumference of the outer wall of the sealing cover 400 can be provided; as shown in Figure 16, a plurality of anti-slip grooves or anti-slip protrusions spaced along the circumference of the outer wall of the sealing cover 400 can also be formed on a portion of the surface near the top of the sealing cover.

[0099] Continuing with Figures 14-16, in some embodiments, the first end of the fixing base 300 is configured to engage with the sealing cap 400, and the second end of the fixing base 300 is configured to connect to the tank body 200. An anti-slip structure may be provided on the outer wall of the fixing base 300. For example, a plurality of anti-slip grooves or anti-slip protrusions spaced along the circumference of the outer wall of the fixing base 300 may be provided. Regardless of the configuration, as long as the sealing cap 400 is engaged with the fixing base 300 to seal the filling hole 310 and facilitate user use, it will be sufficient.

[0100] In some embodiments, the housing 42 and knob 41 of the operating member 40 may also be fixed in other ways. As shown in FIG17 , the housing 42 is disposed on the inner wall of the sealing flange 220 , and the knob 41 is connected to the upper end of the valve stem 20 . The knob 41 is configured to be sleeved on the housing 42 , so that the outer wall of the knob 41 is engaged with the inner wall of the housing 42 . As shown in FIG18 , the housing 42 may also be disposed on the outer wall of the sealing flange 220 , and the knob 41 is connected to the upper end of the valve stem 20 . The knob 41 is configured to be sleeved on the housing 42 , so that the outer wall of the knob 41 is engaged with the inner wall of the housing 42 .

[0101] Since the fluid sealed tank 1000 has the sealing seat 100 mentioned above, the fluid sealed tank 1000 has good sealing properties and can be used as a storage tank for fluids such as paint. When the fluid sealed tank 1000 is used for fluid spraying, the fluid sealed tank can be connected to the outside world through the operations described above, thereby ensuring the stability of the fluid flowing out of the fluid sealed tank 1000 and improving the spraying quality.

Claims

1. A sealing seat, configured to be mounted in a mounting hole of a tank storing a fluid; the sealing seat comprising: a valve body, the valve body being configured to be sealed and disposed in the mounting hole, the valve body having a valve cavity, the valve cavity being in communication with the interior of the tank body; a valve stem, the valve stem being mounted in the valve cavity and having an air flow channel; An operating member is connected to the valve stem, and a communication port communicating with the external environment is provided on the operating member. The operating member is configured to be movable relative to the valve body so that the airflow channel connects the communication port and the valve cavity, or isolates the airflow channel from at least one of the communication port and the valve cavity.

2. The sealing seat according to claim 1, wherein: The communication port is in communication with the air flow channel, and the operating member is configured to drive the valve stem to move so that the air flow channel can be connected to or isolated from the valve cavity; Alternatively, the air flow channel is communicated with the valve cavity, and the operating member is configured to be movable relative to the valve stem so that the communication port can be communicated with or blocked from the air flow channel.

3. The sealing seat according to claim 2, wherein: The first end of the valve stem extends into the valve cavity, and the outlet end of the air flow channel is located at the first end of the valve stem extending into the valve cavity; The operating member is configured to drive the valve stem to rotate or move along the axial direction of the valve stem, so as to selectively connect or disconnect the outlet end from the valve cavity.

4. The sealing seat according to claim 3, further comprising an inner sealing member, wherein the inner sealing member is sleeved on the first end of the valve stem extending into the valve cavity; The outlet end is arranged on the outer peripheral wall of the valve stem, and the valve stem is arranged to be able to at least one of rotate relative to the inner seal and slide along the axial direction of the valve stem, so that the seal can cover or open the outlet end on the outer peripheral wall of the valve stem.

5. The sealing seat according to claim 4, wherein: The second end of the valve stem is fixedly connected to the operating member, and a first hole is provided on the outer peripheral wall of the first end of the valve stem extending into the valve cavity, wherein the first hole forms the outlet end; The operating member is configured to drive the valve stem to extend into the valve cavity along the axial direction of the valve stem, so that the first hole can be located outside the inner sealing member and communicate with the valve cavity.

6. The sealing seat according to claim 5, wherein: The number of the first holes is at least two, and the at least two first holes are spaced apart along the circumference of the valve stem.

7. The sealing seat according to claim 4, wherein: The second end of the valve stem is fixedly connected to the operating member, a second hole is provided on the outer peripheral wall of the first end of the valve stem extending into the valve cavity, the second hole forming the outlet end, and an air groove communicating with the valve cavity is provided on the end surface of the inner sealing member facing the valve cavity; The operating member is configured to at least one of drive the valve stem to rotate and extend into the valve cavity along the axial direction of the valve stem, so that the second hole can communicate with the air groove.

8. The sealing seat according to claim 7, wherein: When the air flow channel is isolated from the valve cavity, the air groove and the second hole are spaced apart and arranged opposite to each other along the axial direction of the valve stem, and the operating member is configured to drive the valve stem to extend into the valve cavity along the axial direction of the valve stem so that the second hole can communicate with the air groove; Alternatively, when the air flow channel is isolated from the valve cavity, the air groove and the second hole are spaced apart in the axial direction of the valve stem and staggered in the circumferential direction of the valve stem, and the operating member is configured to drive the valve stem to rotate and extend into the valve cavity along the axial direction of the valve stem so that the second hole can communicate with the air groove; Alternatively, when the air flow channel is separated from the valve cavity, the air groove and the second hole are located on the same circumference and are staggered along the circumference of the valve stem, and the operating member is configured to drive the valve stem to rotate so that the second hole can be connected to the air groove.

9. The sealing seat according to claim 7, wherein: The number of the second holes is at least two, and the at least two second holes are spaced apart along the circumference of the valve stem. The number of the air grooves is the same as the number of the second holes, and the air grooves are arranged in a one-to-one correspondence with the second holes. Alternatively, the number of the second holes is at least two, and the at least two second holes are spaced apart along the circumference of the valve stem. The air groove extends along the circumference of the inner seal, and the air groove is configured to be communicative with at least one of the second holes.

10. The sealing seat according to claim 3, wherein: The operating member includes a shell and a knob. The shell is sealed and connected to the tank body. The knob is threadedly connected to the shell and connected to the valve stem.

11. The sealing seat according to any one of claims 3 to 10, further comprising an elastic member, wherein the elastic member is disposed in the valve cavity, the elastic member elastically connects the valve stem and the valve body, and the elastic member is configured to push the valve stem to move out of the valve cavity.

12. The sealing seat according to any one of claims 3 to 10, wherein: A first matching portion is provided on the inner wall of the valve cavity, and a second matching portion is provided on the outer wall of the valve stem. The first matching portion can match with the second matching portion to fix the valve stem at a position where the air flow channel is connected to the valve cavity.

13. The sealing seat according to claim 12, wherein: The first matching portion is a convex point, the second matching portion is a groove, and the convex point is configured to be able to fit into the groove; Alternatively, the first matching portion is a groove, the second matching portion is a convex point, and the convex point is configured to be able to fit into the groove; Alternatively, the first matching portion and the second matching portion can be fixed by adsorption; Alternatively, the first matching portion is a first latching protrusion, and the second matching portion is a second latching protrusion, and the second latching protrusion can move with the valve stem to the side of the first latching protrusion away from the operating member and abut against the first latching protrusion.

14. The sealing seat according to claim 2, wherein: The air flow channel includes an inlet end, which is located at the second end where the valve stem is connected to the operating member. The operating member can rotate relative to the valve stem so that the inlet end is aligned with or offset from the communication port.

15. The sealing seat according to claim 14, further comprising a valve cover, wherein the valve cover is fixedly connected to the valve stem, and the valve cover has a communication channel, wherein the communication channel is connected to the air flow channel; The operating member is rotatably mounted on the valve cover, and the communication port is configured to be communicable with the communication channel.

16. The sealing seat according to claim 15, wherein: The communication port is provided on the outer peripheral wall of the operating member; Alternatively, the communication port is provided on the top wall of the operating member, and the communication port is eccentrically arranged with respect to the rotation center of the operating member.

17. The sealing seat according to any one of claims 1-10, 14-16, further comprising: a fixed cover, the fixed cover being configured to be sealed and connected to the mounting hole, and the valve body being disposed on the fixed cover; An outer sealing member is arranged to be sandwiched between the fixing cover and a sealing flange arranged on the tank body around the mounting hole.

18. A fluid-tight tank comprising: A tank body, wherein the bottom wall of the tank body is provided with a mounting hole, and the top wall of the tank body is provided with a matching hole; The sealing seat according to any one of claims 1 to 17, wherein the sealing seat is mounted in the mounting hole; A fixing seat, the fixing seat being mounted on the upper end of the tank body, the fixing seat being configured to seal the matching hole, and the fixing seat being provided with a filling hole; A sealing cover is buckled on the fixing seat and is configured to seal the filling hole.

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