Low-temperature stop valve
By using an elliptical sealing ring in the low-temperature shut-off valve and pressing it into the seal counterhole, the media leakage caused by the shrinkage of the packing under low-temperature conditions is solved, and a good sealing effect is achieved.
Patent Information
- Application Number
- CN202421701351.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-18
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2034-07-18
AI Technical Summary
When existing shut-off valves transmit low-temperature medium, the packing is prone to shrinkage, resulting in the problem of medium leakage.
A low-temperature shut-off valve is designed, using an elliptical sealing ring and pressing it into the sealing counterhole, so that the sealing ring is squeezed through deformation to prevent the sealing ring from shrinking in the low-temperature environment and ensure the sealing effect.
Through the design of the elliptical sealing ring, it can maintain a good sealing effect in a low-temperature environment to avoid medium leakage, solving the problem of leakage of the shut-off valve under low-temperature conditions.
Smart Images
Figure CN222937262U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of globe valves, and particularly relates to a cryogenic globe valve. Background Art
[0002] A globe valve, also known as a stop valve, belongs to a forced-sealing valve. Therefore, when the valve is closed, pressure must be applied to the valve flap to force the sealing surface not to leak. When the medium enters the valve from below the valve flap, the resistance that the operating force needs to overcome is the friction between the valve stem and the packing and the thrust generated by the pressure of the medium. The force to close the valve is greater than the force to open the valve, so the diameter of the valve stem needs to be large, otherwise the valve stem will be bent; however, in the existing globe valves, when transporting cryogenic media, the packing is prone to shrinkage, and a gap is generated between the packing and the valve cover, resulting in medium leakage.
[0003] Therefore, how to avoid leakage of the globe valve when transporting cryogenic media is a technical problem that needs to be solved urgently in this field. Content of the Utility Model
[0004] The purpose of the utility model is to provide a cryogenic globe valve.
[0005] To solve the above technical problems, the utility model provides a cryogenic globe valve, including: a valve seat, which is provided with a liquid inlet hole, a liquid outlet hole and a closing cavity inside. The liquid inlet hole bends upward and communicates with the closing cavity, so that a circular closing port is formed at the communication part between the liquid inlet hole and the closing cavity. The liquid outlet hole communicates with the side wall of the closing cavity; a valve cover arranged on the top of the valve seat, inside which a valve stem is slidably arranged. A valve flap is arranged at the bottom of the valve stem, and the valve flap can block the closing port. A plurality of sealing rings are sleeved on the valve stem, and a sealing counterbore is opened inside the valve cover. The sealing rings are pressed in the sealing counterbore, and the cross section of the sealing rings is elliptical, so that the side wall of the sealing counterbore is always pressed tightly.
[0006] Preferably, the ratio of the length of the major axis to the length of the minor axis of the cross section of the sealing ring is 1.15 - 1.05.
[0007] Preferably, a plurality of the sealing rings are spirally stacked.
[0008] Preferably, the included angle between the major axes of adjacent sealing rings is 25 - 35°.
[0009] Preferably, the cross section of the inner hole of the sealing ring is elliptical, and the major axis of the cross section of the inner hole is collinear with the major axis of its outer shape.
[0010] Preferably, the ratio of the length of the major axis to the length of the minor axis of the cross section of the inner hole of the sealing ring is 1.1 - 1.05.
[0011] Preferably, a lengthened shaft body extends from the top of the valve cover. A through hole is formed in the lengthened shaft body, the valve stem is inserted into the through hole, and the sealing counterbore is opened at the mouth of the through hole.
[0012] Preferably, the ratio of the length of the lengthened shaft body to the diameter of the valve cover is 2.25 - 1.75.
[0013] Preferably, an adjusting nut is inserted into the sealing counterbore. The adjusting nut presses on the top of the sealing ring. The valve stem is threadedly connected to the adjusting nut, and a pressing plate is pressed on the top of the adjusting nut.
[0014] Preferably, a connecting flange is integrally provided on the side wall of the lengthened shaft body. The pressing plate is bolted to the connecting flange, and a rotating wrench is provided at the top of the valve stem.
[0015] The beneficial effects of the present utility model are as follows:
[0016] A sealing ring (i.e., packing) is sleeved on the slidably arranged valve stem to achieve the sealing between the valve stem and the valve seat. The sealing ring is designed to be elliptical and pressed into the sealing counterbore, so that the sealing ring can squeeze the sealing counterbore through deformation, avoiding the shrinkage of the sealing ring in a low-temperature environment, completing the good sealing between the packing and the valve cover, and avoiding the leakage of the medium.
[0017] Other features and advantages of the present utility model will be described in the subsequent description, and, in part, will be obvious from the description or will be understood by implementing the present utility model.
[0018] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the following specific preferred embodiments are given, and in conjunction with the accompanying drawings, the detailed description is as follows. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0020] Figure 1 is a perspective view of a preferred embodiment of the cryogenic globe valve of the present utility model;
[0021] Figure 2 is a sectional view of a preferred embodiment of the cryogenic globe valve of the present utility model;
[0022] Figure 3 is a top view of a preferred embodiment of the sealing ring of the present utility model;
[0023] Figure 4 It is an installation schematic diagram of a preferred embodiment of the sealing ring of the present utility model.
[0024] In the figure:
[0025] 1. Valve seat; 11. Liquid inlet hole; 12. Liquid outlet hole; 13. Closing cavity; 14. Closing opening;
[0026] 2. Valve cover; 21. Valve rod; 22. Valve flap; 23. Sealing ring; 24. Sealing counterbore; 25. Extended shaft body; 251. Through hole; 252. Connecting flange; 26. Adjusting nut; 27. Pressing plate; 28. Rotating wrench. Detailed implementation manners
[0027] For the purpose of making the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.
[0028] As Figures 1 to 4 shown, at least one embodiment provides a cryogenic stop valve, including: a valve seat 1, which is provided with a liquid inlet hole 11, a liquid outlet hole 12 and a closing cavity 13 therein. The liquid inlet hole 11 bends upward to communicate with the closing cavity 13, so that a circular closing opening 14 is formed at the communicating portion with the closing cavity 13. The liquid outlet hole 12 communicates with the side wall of the closing cavity 13; a valve cover 2 arranged on the top of the valve seat 1, in which a valve rod 21 is slidably arranged. A valve flap 22 is arranged at the bottom of the valve rod 21. The valve flap 22 can block the closing opening 14. A plurality of sealing rings 23 are sleeved on the valve rod 21. And a sealing counterbore 24 is formed in the valve cover 2. The sealing ring 23 is pressed in the sealing counterbore 24, and the cross section of the sealing ring 23 is elliptical, so that it always presses against the side wall of the sealing counterbore 24.
[0029] In some embodiments, the ratio of the length of the major axis to the length of the minor axis of the cross section of the sealing ring 23 is 1.15 - 1.05; in short, the outer shape of the sealing ring 23 is an ellipse, and if the ratio of its major axis (2a) to its minor axis (2b) is too large, the sealing ring 23 needs to undergo too much deformation to fit the sealing counterbore 24, which easily causes the sealing ring 23 to break. If the ratio is too small, a good sealing effect cannot be achieved; further, the major axis of the outer shape of the sealing ring 23 is slightly larger than the inner hole of the sealing counterbore 24.
[0030] In some embodiments, several of the sealing rings 23 are spirally stacked; in short, when the sealing ring 23 deforms radially, it will also deform axially. By spirally stacking the sealing rings 23, it is possible to prevent the axially deformed parts of the sealing rings 23 from squeezing each other, resulting in damage to the sealing rings 23.
[0031] In some embodiments, the included angle between the major axes of adjacent sealing rings 23 is 25 - 35°; in short, the preferred range of the spiral angle of the sealing ring 23 (i.e., α and β) is 25 - 35°.
[0032] In some embodiments, the cross-section of the inner hole of the sealing ring 23 is elliptical, and the major axis of the cross-section of its inner hole is collinear with the major axis of the cross-section of its outer shape; in short, designing the inner hole of the sealing ring 23 to be elliptical can ensure that the inner hole of the sealing ring 23 fits tightly against the valve stem 21, improving the sealing performance between the sealing ring 23 and the valve stem 21.
[0033] In some embodiments, the ratio of the length of the major axis to the minor axis of the cross-section of the inner hole of the sealing ring 23 is 1.1 - 1.05; in short, since the deformation amount of the inner hole of the sealing ring 23 is small, the ratio of the length of the major axis to the minor axis of the cross-section of the inner hole of the sealing ring 23 is smaller than the ratio of the length of the major axis to the minor axis of the cross-section of its outer shape, to ensure the sealing performance between the sealing ring 23 and the valve stem 21.
[0034] In some embodiments, a lengthened shaft body 25 extends from the top of the valve cover 2. A through hole 251 is provided in the lengthened shaft body 25, and the valve stem 21 is inserted into the through hole 251, and the sealing counterbore 24 is provided at the opening of the through hole 251; in short, the lengthened shaft body 25 can increase the distance between the packing and the valve seat 1, reducing the influence of the low-temperature medium on the packing.
[0035] In some embodiments, the ratio of the length of the lengthened shaft body 25 to the diameter of the valve cover 2 is 2.25 - 1.75; in short, if the length of the lengthened shaft body 25 is too long, it will cause the valve stem 21 to be lengthened, reducing the rigidity of the valve stem 21.
[0036] In some embodiments, an adjusting nut 26 is inserted into the sealing counterbore 24. The adjusting nut 26 presses on the top of the sealing ring 23. The valve stem 21 is threadedly connected to the adjusting nut 26, and a pressing plate 27 is pressed on the top of the adjusting nut 26; in short, by providing the adjusting nut 26, the valve stem 21 can be rotated to move up and down to complete the opening / closing of the closing port 14.
[0037] In some embodiments, a connecting flange 252 is integrally provided on the side wall of the lengthened shaft body 25. The pressing plate 27 is connected to the connecting flange 252 by bolts, and a rotating wrench 28 is provided at the top of the valve stem 21. In short, the pressing plate 27 can be installed through the connecting flange 252, and at the same time, the force arm of the valve stem 21 can be increased by the rotating wrench to improve the efficiency of rotating the valve stem 21.
[0038] In the description of the embodiments of the present invention, unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.
[0039] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0040] Taking the above ideal embodiments of the present invention as an inspiration, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of the present invention. The technical scope of the present invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.
Claims
1. A cryogenic stop valve, characterized in that: include: A valve seat (1) having a liquid inlet hole (11), a liquid outlet hole (12) and a closed cavity (13) disposed therein, wherein the liquid inlet hole (11) is bent upward to communicate with the closed cavity (13), so that a circular closed opening (14) is formed at the point of communication between the liquid inlet hole (11) and the closed cavity (13), and the liquid outlet hole (12) is communicated with a side wall of the closed cavity (13); A valve cover (2) is arranged on the top of the valve seat (1), a valve stem (21) is slidably arranged therein, a valve flap (22) is arranged at the bottom of the valve stem (21), the valve flap (22) is suitable for blocking the closing opening (14), and a plurality of sealing rings (23) are sleeved on the valve stem (21); and A sealing counterbore (24) is provided in the valve cover (2), and the sealing ring (23) is pressed into the sealing counterbore (24). The cross section of the sealing ring (23) is elliptical so that it always presses against the side wall of the sealing counterbore (24).
2. The cryogenic shut-off valve according to claim 1, characterized in that: The cross section of the sealing ring (23) is elliptical, and the ratio of the length of its major axis to that of its minor axis is 1.15-1.
05.
3. The cryogenic shut-off valve according to claim 1, characterized in that: A plurality of the sealing rings (23) are arranged in a spiral stack.
4. The cryogenic shut-off valve according to claim 3, characterized in that: The included angle between the major axes of adjacent sealing rings (23) is 25-35°.
5. The cryogenic shut-off valve according to claim 1, characterized in that: The cross section of the inner hole of the sealing ring (23) is elliptical, and the major axis of the cross section of the inner hole is colinear with the major axis of the cross section of its outer shape.
6. The cryogenic shut-off valve according to claim 5, characterized in that: The inner hole of the sealing ring (23) is elliptical, and the ratio of the length of the major axis to the minor axis of the cross section is 1.1-1.
05.
7. The cryogenic shut-off valve according to claim 1, characterized in that: An extended shaft (25) extends from the top of the valve cover (2), a through hole (251) is provided on the extended shaft (25), the valve stem (21) is inserted into the through hole (251), and the sealing counterbore (24) is provided with an opening of the through hole (251).
8. The cryogenic shut-off valve according to claim 7, characterized in that: The ratio of the length of the extended shaft (25) to the diameter of the valve cover (2) is 2.25-1.
75.
9. The cryogenic shut-off valve according to claim 8, characterized in that: An adjusting nut (26) is inserted into the sealing counterbore (24), the adjusting nut (26) is pressed onto the top of the sealing ring (23), the valve stem (21) is threadedly connected to the adjusting nut (26), and a clamping plate (27) is pressed onto the top of the adjusting nut (26).
10. The cryogenic shut-off valve according to claim 9, characterized in that: The side wall of the extended shaft (25) is integrally provided with a connecting flange (252), the pressing plate (27) and the connecting flange (252) are connected to each other via bolts, and A rotating wrench (28) is provided on the top of the valve stem (21).