A valve for a pressure tank

Abstract

The present invention provides a valve for a pressure tank, comprising: a sealing sleeve, a valve stem, a sealing cup assembled on the valve stem, and a valve chamber having a chamber inside; one end of the valve stem is provided with a pier head and a spring, the side wall is provided with a feed port, the end far from the pier head is provided with a discharge port, and a flow channel communicating the feed port and the discharge port is arranged inside; the sealing sleeve is sleeved on the valve stem, one end of the sealing sleeve has a sealing flange, the other end is provided with a plurality of sealing parts, each sealing part is an annular structure coaxial with the sealing sleeve, and the ends of all the sealing parts abut against the pier head and form a sealing surface at the contact part; the valve chamber is sleeved on the sealing sleeve, and the top of the valve chamber abuts against the sealing flange, and the inner bottom surface of the valve chamber abuts against the spring. The present invention has excellent sealing performance and pressure resistance, and the multi-channel sealing structure can still maintain the sealing performance in case of the failure of any one sealing performance, effectively prolonging the service life of the valve.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and particularly to a valve for a pressurized tank. Background Art

[0002] In recent years, the characteristic that polyurethane plastic foams and cures rapidly has been increasingly widely utilized for its unique functions in aspects such as sealing and plugging leaks, heat insulation and insulation, filling holes and gaps, and fixing and bonding. This polyurethane foam sealant can cure upon contact with moisture in the air, so it requires good sealing storage in the non-use state. Generally, the polyurethane foam sealant is pressurized and filled into a metal container, and then sealed by a special valve. This valve not only needs to have reliable opening and closing performance, but also needs to ensure pressure resistance and sealing performance. However, the current structural design of the valve for the pressurized tank makes its sealing part relatively weak, resulting in the problem of sealing failure easily occurring during long-term pressing. Summary of the Invention

[0003] In order to solve the technical problems existing in the background art, the present invention proposes a valve for a pressurized tank.

[0004] A valve for a pressurized tank proposed by the present invention includes: a sealing sleeve, a valve stem, a sealing cup assembled on the valve stem, and a valve chamber having a chamber inside;

[0005] One end of the valve stem is provided with a pier head and a spring. A feed port is provided on the side wall of the valve stem near the pier head end, and a discharge port is provided at the end of the valve stem far from the pier head. A flow channel communicating the feed port and the discharge port is provided inside the valve stem;

[0006] The sealing sleeve is sleeved on the valve stem. One end of the sealing sleeve has a sealing flange extending outward. The other end of the sealing sleeve is provided with a plurality of sealing parts arranged at intervals from the inside to the outside. Each sealing part is an annular structure coaxial with the sealing sleeve, and the ends of all the sealing parts abut against the pier head and form a sealing surface at the contact part;

[0007] The valve chamber is sleeved on the sealing sleeve. The top of the valve chamber abuts against the sealing flange, the inner bottom surface of the valve chamber abuts against the spring, and the valve chamber has a liquid inlet and outlet for the material in the tank to enter and exit its interior.

[0008] Preferably, the cross-sectional area of the pier head increases sequentially from the discharge port towards the feed port direction, and the end of the pier head has an outer edge portion extending outward; all the sealing parts are arranged in a stepped manner from the inside of the sealing sleeve to its outside, and the outermost sealing part is at the lowest position and abuts against the outer edge portion, and the innermost sealing part is at the highest position and abuts against the outer circumference of the pier head near the valve stem end.

[0009] Preferably, a plurality of circumferentially spaced reinforcing ribs are provided on the inner circumferential surface of the outermost sealing part.

[0010] Preferably, the top surface of the outermost sealing portion is an arc surface, and chamfers are provided at the joints between the end faces of the remaining sealing portions located inside the outermost sealing portion and their outer circumferences.

[0011] Preferably, the sealing sleeve is made of plastic.

[0012] Preferably, an inner gasket made of rubber material is provided at the joint between the sealing flange and the sealing cup. The inner gasket is sleeved on the valve stem and is in interference fit with the valve stem.

[0013] Preferably, a coaxial annular protrusion is provided on the top surface of the sealing flange, and the inner gasket is in a compressed state in the thickness direction.

[0014] Preferably, the bottom of the sealing cup is provided with a concave structure that depresses upward or downward to enhance its pressure-bearing capacity.

[0015] Preferably, a ring groove coaxial with the valve stem is provided at the end of the pier head, and the part of the pier head located inside the ring groove protrudes to form a convex platform; one end of the spring is located in the ring groove.

[0016] Preferably, at least three circumferentially evenly distributed limiting ribs are provided on the bottom surface of the valve chamber, and one end of the spring is located inside each limiting rib and is radially fixed by the limiting ribs.

[0017] In the present invention, a pier head is provided at one end of the valve stem, the sealing sleeve is sleeved on the valve stem, and the end of one end of the sealing sleeve has a sealing flange extending outward. The other end of the sealing sleeve is provided with a plurality of sealing portions arranged at intervals from the inside to the outside in sequence. Each sealing portion is an annular structure coaxial with the sealing sleeve, and the ends of all the sealing portions abut against the pier head and form a sealing surface at the contact part, so as to form multiple seals between the valve stem and the sealing sleeve. At the same time, the valve chamber is sleeved on the sealing sleeve, and the top of the valve chamber abuts against the sealing flange, so that when the sealing sleeve is subjected to a downward pressure, it is pressed tighter against the end face of the valve chamber. Subsequently, when the valve stem is pressed down to press out the material liquid, the sealing sleeve is pushed to squeeze the end of the valve chamber, so as to enhance the sealing performance of the joint surface between the two. The valve for the pressure tank forms a first seal between the valve stem and the valve chamber by using the sealing sleeve, a second seal between the end of the valve chamber and the sealing flange of the sealing sleeve, and a third seal between the pier head of the valve stem and the sealing portion of the sealing sleeve. And the three seals have multiple sealing surfaces, so that the valve has excellent sealing performance and pressure resistance. And the structure of the multiple seals can still maintain the sealing performance in the case of the failure of any one sealing performance, effectively extending the service life of the valve and ensuring that the valve still maintains good sealing performance during long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of a valve for a pressure tank proposed by the present invention;

[0019] Figure 2Assembly schematic diagram of the seal sleeve and the valve stem in a valve for a pressure tank proposed by the present invention;

[0020] Figure 3 Structural schematic diagram of the seal sleeve in a valve for a pressure tank proposed by the present invention;

[0021] Figure 4 is Figure 3 partial enlarged view of. Specific embodiments

[0022] Referring to Figures 1-4 , a valve for a pressure tank proposed by the present invention includes: a seal sleeve 1, a valve stem 2, a sealing cup 3 assembled on the valve stem 2, and a valve chamber 4 with a chamber inside.

[0023] One end of the valve stem 2 is provided with a head 21 and a spring 5. A feed port 22 is provided on the side wall of the valve stem 2 near the head 21. An outlet port 23 is provided at the end of the valve stem 2 far from the head 21. A flow channel connecting the feed port 22 and the outlet port 23 is provided inside the valve stem 2. The seal sleeve 1 is sleeved on the valve stem 2. One end of the seal sleeve 1 has a sealing flange 11 extending outward. The other end of the seal sleeve 1 is provided with a plurality of sealing parts 12 arranged at intervals from inside to outside. Each sealing part 12 is an annular structure coaxial with the seal sleeve 1. And the ends of all the sealing parts 12 abut against the head 21 and form a sealing surface at the contact part, so as to form multiple seals between the valve stem 2 and the seal sleeve 1.

[0024] The valve chamber 4 is sleeved on the seal sleeve 1 and is assembled with the seal sleeve 1 and the sealing cup 3 under the extrusion of the sealing cup 3. The top of the valve chamber 4 abuts against the sealing flange 11. The inner bottom surface of the valve chamber 4 abuts against the spring 5. The valve chamber 4 has a feed liquid inlet and outlet 41 for the material in the tank to enter and exit its interior. So that when the seal sleeve 1 is subjected to a downward pressure, it presses more tightly against the end face of the valve chamber 4. Then, when pressing down the valve stem 2 to press out the material liquid, the seal sleeve 1 is pushed to squeeze against the end of the valve chamber 4 to enhance the sealing performance of the joint surface between the two.

[0025] The working principle is: when it is necessary to press out the material in the high-pressure tank, press down the valve stem 2 so that the feed port 22 on the valve stem 2 enters the valve chamber 3 to make the flow channel in the valve stem 2 and the valve chamber 3 in a conducting state. Then, the material inside the valve chamber 3 enters the flow channel through the feed port 22 and flows out through the outlet port 23 under the action of pressure. And at this time, the spring 5 is in a compressed state. When the valve stem 2 is released, the valve stem 2 automatically resets under the action of the spring 5, and its head 21 abuts against the sealing part 12 on the seal sleeve 1 again to block the conduction between the feed port 21 and the valve chamber 3.

[0026] As can be seen from the above, the structural design of the present invention enables the sealing sleeve 1 to form a first seal between the valve stem 2 and the valve chamber 4, a second seal between the end of the valve chamber 4 and the sealing flange 11 of the sealing sleeve 1, and a third seal between the head 21 of the valve stem 2 and the sealing portion 12 of the sealing sleeve 1. Moreover, the third seal has multiple sealing surfaces, thereby endowing the valve with excellent sealing performance and pressure resistance. The structure of multiple seals can still maintain the sealing performance even when any one of the sealing performances fails, effectively extending the service life of the valve and ensuring that the valve still maintains good sealing performance during long-term use.

[0027] In addition, in this embodiment, the cross-sectional area of the head 21 gradually increases from the discharge port 23 to the feed port 22, making the outer wall of the head 21 form a gradually increasing slope, and the end of the head 21 has an outer edge portion 211 extending outward; all the sealing portions 12 are arranged in a stepped manner from the inner side to the outer side of the sealing sleeve 1, and the outermost sealing portion 12 is at the lowest position and abuts against the outer edge portion 211, and the innermost sealing portion 12 is at the highest position and abuts against the outer periphery of the head 21 near one end of the valve stem 2. The stepped structural design of the sealing portion 12 combined with the slope of the head 21 can make the sealing surfaces form a height dislocation in the axial direction, thereby further enhancing the sealing effect.

[0028] Moreover, due to the stepped structural design, the strength of the outermost sealing portion 12 is weaker than that of the other inner sealing portions 12. To enhance the strength of the outermost sealing portion 12, several circumferentially spaced reinforcing ribs 13 are provided on the inner peripheral surface of the outermost sealing portion 12 in this embodiment.

[0029] To enhance the sealing performance of the sealing portion 12, the top surface of the outermost sealing portion 12 is set as an arc surface 121 in this embodiment, so that it can have better extensibility when being pressed, and thus can contact the outer edge portion 211 more closely. Chamfers 122 are provided at the junctions of the end faces and the outer peripheral surfaces of the remaining sealing portions located inside the outermost sealing portion 12, so that they can better fit against the inclined surface of the head 21.

[0030] In this embodiment, the material of the sealing sleeve 1 is plastic, so as to have good support strength while maintaining good sealing performance, thereby enhancing the pressure resistance. And to further enhance the sealing effect, an inner washer 6 made of rubber material is provided at the junction of the sealing flange 11 and the sealing cup 3 in this embodiment. The inner washer 6 is sleeved on the valve stem 2 and has an interference fit with the valve stem 2.

[0031] In addition, to further enhance the sealing effect, a coaxial annular protrusion 111 is provided on the top surface of the sealing flange 11 in this embodiment, and the inner washer 6 is in a compressed state in the thickness direction, thereby enhancing the sealing effect of the inner washer 6.

[0032] In addition, in this embodiment, a concave or convex structure 31 that is recessed upward or downward is provided at the bottom of the cup seal 3, so that the cup seal 3 can withstand greater pressure.

[0033] In this embodiment, the material of the cup seal 3 includes but is not limited to materials such as tinplate and aluminum.

[0034] In this embodiment, at least three circumferentially evenly distributed limiting ribs 42 are provided on the inner bottom surface of the valve chamber 4. One end of the spring 5 is located inside each limiting rib 41 and is radially fixed by the limiting rib 42. A ring groove 212 coaxial with the valve stem 2 is provided at the end of the pier head 21. The part of the pier head 21 located inside the ring groove 212 protrudes to form a boss 213. The other end of the spring 5 is located inside the ring groove 212.

[0035] As described above, only the preferred specific embodiments of the present invention are given, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. A valve for a pressurized tank, characterized in that: include: A sealing sleeve (1), a valve stem (2), a sealing cup (3) assembled on the valve stem (2), and a valve chamber (4) having a cavity therein; One end of the valve stem (2) is provided with a pier head (21) and a spring (5); a side wall of the valve stem (2) close to the pier head (21) is provided with an inlet (22); an end of the valve stem (2) away from the pier head (21) is provided with an outlet (23); and a flow channel connecting the inlet (22) and the outlet (23) is provided inside the valve stem (2); The sealing sleeve (1) is sleeved on the valve stem (2), and one end of the sealing sleeve (1) has a sealing flange (11). The other end of the sealing sleeve (1) is provided with a plurality of sealing portions (12) arranged at intervals from the inside to the outside. Each sealing portion (12) is an annular structure coaxial with the sealing sleeve (1), and the ends of all the sealing portions (12) abut against the pier head (21) to form a sealing surface at the contact portion. The valve chamber (4) is mounted on the sealing sleeve (1), the top of the valve chamber (4) abuts against the sealing flange (11), the inner bottom surface of the valve chamber (4) abuts against the spring (5), and the valve chamber (4) has a liquid inlet and outlet (41) for the material in the tank to enter and exit the interior thereof; The cross-sectional area of the pier head (21) increases in sequence from the discharge port (23) toward the feed port (22), and the end of the pier head (21) has an outer edge portion (211) extending outward; all the sealing portions (12) are arranged in a stepped manner from the inner side of the sealing sleeve (1) to the outer side thereof, and the outermost sealing portion (12) is at the lowest position and abuts against the outer edge portion (211), and the innermost sealing portion (12) is at the highest position and abuts against the outer periphery of the pier head (21) near one end of the valve stem (2).

2. The valve for a pressurized tank according to claim 1, characterized in that A plurality of reinforcing ribs (13) arranged at circumferential intervals are provided on the inner circumferential surface of the outermost sealing portion (12).

3. The valve for a pressurized tank according to claim 1, characterized in that: The top surface of the outermost sealing portion (12) is an arc surface (121), and the end surfaces of the remaining sealing portions located inside the outermost sealing portion (12) are all provided with chamfers (122) at the junction with their outer peripheral surfaces.

4. The valve for a pressurized tank according to claim 1, characterized in that: The sealing sleeve (1) is made of plastic.

5. The valve for a pressurized tank according to claim 1, wherein: An inner gasket (6) made of rubber material is provided at the junction of the sealing flange (11) and the sealing cup (3). The inner gasket (6) is sleeved on the valve stem (2) and has an interference fit with the valve stem (2).

6. The valve for a pressurized tank according to claim 5, characterized in that: The top surface of the sealing flange (11) is provided with an annular protrusion (111) coaxial therewith, and the inner gasket (6) is in a compressed state in the thickness direction.

7. The valve for a pressurized tank according to claim 1, wherein: The bottom of the sealing cup (3) is provided with a concave structure (31) that is concave upward or downward to enhance its pressure bearing capacity.

8. The valve for a pressurized tank according to any one of claims 1 to 7, characterized in that: The end of the pier head (21) is provided with an annular groove (212) coaxial with the valve stem (2), and the portion of the pier head (21) located inside the annular groove (212) is raised to form a boss (213); one end of the spring (5) is clamped in the annular groove (212).

9. The valve for a pressurized tank according to claim 8, characterized in that At least three circumferentially evenly distributed limiting ribs (42) are provided on the inner bottom surface of the valve chamber (4); the other end of the spring (5) is located inside each limiting rib and is constrained and fixed in the radial direction by the limiting ribs (42).

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