Redundant progressive valve rod sealing device of underwater valve

Abstract

The utility model discloses a redundant progressive valve rod sealing device of an underwater valve, which belongs to the technical field of underwater valve sealing, and comprises a valve cover, a valve rod and a sealing assembly matched with the valve rod, and the sealing assembly comprises a first stuffing box and a first stuffing gland matched with the first stuffing box. A first V-shaped sealing gasket, a second V-shaped sealing gasket and a third V-shaped sealing gasket are stacked in the first stuffing box from top to bottom, a conical pressing ring with a conical section is arranged below the third V-shaped sealing gasket, and the top of the conical pressing ring is in contact fit with the bottom of the third V-shaped sealing gasket; the two sides of the first V-shaped sealing gasket are provided with at least two outer side annular protrusions and two inner side annular protrusions, the outer side annular protrusions make contact with the inner side of the first stuffing box, and the inner side annular protrusions make contact with the valve rod. The multi-redundant sealing design is adopted, when one sealing device is damaged, the remaining sealing devices still have the sealing effect, the sealing performance of the device is enhanced, and meanwhile the service life of the device is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of underwater valve sealing, in particular to a redundant and alternate valve stem sealing device of an underwater valve. Background Art

[0002] The valve is a control component in the fluid delivery system, with functions such as shutoff, regulation, diversion, backflow prevention, pressure stabilization, flow diversion or overflow pressure relief. In the existing sealing device between the valve cover and the valve stem, a double O-ring sealing structure is generally used to seal the stuffing box on the valve.

[0003] This structure is prone to O-ring damage during O-ring assembly and valve opening and closing. Once the O-ring is damaged, it cannot achieve the sealing effect, causing medium leakage, thereby causing economic losses and environmental pollution. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a redundant and replaceable valve stem sealing device for an underwater valve, so as to improve the problem that the sealing ring of the current sealing device is easily damaged and causes medium leakage.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a redundant and alternate valve stem sealing device for an underwater valve, characterized in that it includes a valve cover, a valve stem, and a sealing assembly cooperating with the valve stem, the sealing assembly includes a first stuffing box and a stuffing gland cooperating with the first stuffing box, a first V-shaped sealing gasket, a second V-shaped sealing gasket, and a third V-shaped sealing gasket are stacked from top to bottom in the first stuffing box, and a conical clamping ring with a conical cross-section is arranged below the third V-shaped sealing gasket, and the top of the conical clamping ring is in contact and cooperate with the bottom of the third V-shaped sealing gasket; at least two outer annular protrusions and two inner annular protrusions are arranged on both sides of the first V-shaped sealing gasket, the outer annular protrusion is in contact with the inner side of the first stuffing box, and the inner annular protrusion is in contact with the valve stem.

[0006] The above technical solutions in the embodiments of the present application have at least the following technical effects:

[0007] The utility model has a multi-sealing structure, which provides reliable sealing performance. When one sealing structure is damaged or aged, causing the sealing ring to fail, the other sealing structures can still achieve a good sealing effect, thereby extending the service life of the equipment and achieving durability.

[0008] In some embodiments, a first annular protrusion is disposed on an upper portion of the first V-shaped sealing gasket, and a first annular groove cooperating with the first annular protrusion is disposed on a lower portion of the second V-shaped sealing gasket.

[0009] In some embodiments, at least three second V-shaped sealing gaskets are arranged between the first V-shaped sealing gasket and the third V-shaped sealing gasket, and a second annular protrusion is provided on the upper portion of the second V-shaped sealing gasket, which cooperates with the first annular groove of the second V-shaped sealing gasket on the upper layer.

[0010] In some embodiments, a second annular groove is provided at the lower portion of the third V-shaped sealing gasket to cooperate with a second annular protrusion at the upper portion of the second V-shaped sealing gasket below it.

[0011] In some embodiments, the sealing assembly includes a second stuffing box arranged above the stuffing cover 1 and a stuffing cover 2 cooperating with the second stuffing box, and the second stuffing box is provided with: a first support ring with an I-shaped cross-section, and the first support ring is respectively provided with an annular groove 1 and an annular groove 2 on the side close to the valve stem and the side away from the valve stem, and O-rings are respectively provided in the annular groove 1 and the annular groove 2.

[0012] In some embodiments, the second stuffing box is provided with: a second support ring with an I-shaped cross-section, and the second support ring is provided with an annular groove three and an annular groove four on the side close to the valve stem and the side away from the valve stem respectively, and lip sealing rings are respectively provided in the annular groove three and the annular groove four.

[0013] In some embodiments, the inner side of the lip-shaped sealing ring is wrapped with a second annular sealing ring with an ellipsoidal cross-section, and an annular base with an inverted T-shaped cross-section is arranged at the lower end of the second annular sealing ring, and the annular base presses against the second annular sealing ring.

[0014] In some embodiments, a first threaded hole is provided on the packing gland 1, and the packing gland 1 is fixedly connected to the second support ring by bolts; a second threaded hole is provided on the first support ring, and the packing gland 2 is fixedly connected to the first support ring by bolts.

[0015] In some embodiments, at least two disc springs are disposed between the first support ring and the second support ring.

[0016] In some embodiments, a plurality of pressurized elastic members are provided on both sides of the conical clamping ring, one end of the elastic member is fixedly connected to the lower portion of the conical clamping ring, and the other end abuts against the inner side of the first V-shaped sealing gasket. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0018] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0019] Figure 3This is a schematic diagram of the structure of the first stuffing box of the utility model embodiment;

[0020] Figure 4 It is a schematic structural diagram of the second stuffing box and the stuffing gland 1 of the embodiment of the utility model.

[0021] Among them, the reference numerals are as follows: 01, valve cover; 02, valve stem; 03, sealing assembly; 032, packing gland one; 031, packing gland two; 033, first stuffing box; 034, second stuffing box; 0331, conical clamping ring; 0333, first V-type sealing gasket; 0334, second V-type sealing gasket; 0335, third V-type sealing gasket; 0332, outer annular protrusion; 03310, inner annular protrusion; 0338, first circular annular protrusion; 0337, first circular annular groove; 0336, first Two annular protrusions; 0339, second annular groove; 03311, pressurized elastic member; 0321, first threaded hole; 0341, second threaded hole; 0342, annular groove one; 0343, annular groove two; 0344, annular groove three; 0345 annular groove four; 0346, disc washer; 0347, O-ring; 0348, second annular sealing ring; 0349, lip sealing ring; 03410, first support ring; 03411, second support ring; 03412, annular base. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0024] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0025] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc.

[0026] The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings and is only for the convenience of describing the present application and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it should not be understood as a limitation on the present application.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0028] In this application, "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships; for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0029] It should be noted that, in the present application, words such as "in some embodiments", "exemplarily", "for example", etc. are used to indicate examples, illustrations or descriptions. Any embodiment or design described in the present application as "in some embodiments", "exemplarily", "for example" should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "in some embodiments", "exemplarily", "for example", etc. is intended to present related concepts in a concrete way, meaning that specific features, structures or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the above words in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0030] The valve is a control component in the fluid delivery system, with functions such as shutoff, regulation, diversion, backflow prevention, pressure stabilization, flow diversion or overflow pressure relief. In the existing sealing device between the valve cover and the valve stem, a double O-ring sealing structure is generally used to seal the stuffing box on the valve.

[0031] This structure is prone to O-ring damage during O-ring assembly and valve opening and closing. Once the O-ring is damaged, it cannot achieve the sealing effect, causing medium leakage, thereby causing economic losses and environmental pollution.

[0032] Based on this, in order to improve the problem of leakage caused by easy damage of the sealing device in the related art, the embodiment of the present application provides the following solution.

[0033] Example 1

[0034] Please also read Figures 1 to 4 The embodiment of the present application provides a redundant and successive valve stem sealing device for an underwater valve, including a valve cover 01, a valve stem 02, and a sealing assembly 03 cooperating with the valve stem 02, wherein the sealing assembly 03 includes a first stuffing box 033 and a stuffing gland 032 cooperating with the first stuffing box 033, wherein a first V-shaped sealing gasket 0333, a second V-shaped sealing gasket 0334, and a third V-shaped sealing gasket 0335 are stacked from top to bottom in the first stuffing box 033, and a conical clamping ring 0331 with a conical cross-section is arranged below the third V-shaped sealing gasket, and the top of the conical clamping ring 0331 is in contact with the bottom of the third V-shaped sealing gasket 0335; while stabilizing the first stuffing box 033, an upward pre-tightening force is provided to the first V-shaped sealing gasket 0333 to enhance its sealing and stability.

[0035] At least two outer annular protrusions 0332 and two inner annular protrusions 03310 are provided on both sides of the first V-shaped sealing gasket 0333, the outer annular protrusions 0332 are in contact with the inner side of the first stuffing box 033, and the inner annular protrusions 03310 are in contact with the valve stem 02. The conical clamping ring 0331 applies pressure to both sides of the first V-shaped sealing gasket 0333, so that the outer annular protrusions 0332 and the inner annular protrusions 03310 on both sides of the first V-shaped sealing gasket 0333 are deformed and in close contact with the valve stem 02 and the inner side of the first stuffing box 033, thereby enhancing the sealing performance.

[0036] A first annular protrusion 0338 is disposed on the upper portion of the first V-shaped sealing gasket 0333 , and a first annular groove 0337 cooperating with the first annular protrusion 0338 is disposed on the lower portion of the second V-shaped sealing gasket 0334 .

[0037] At least three second V-shaped sealing gaskets 0334 are arranged between the first V-shaped sealing gasket 0333 and the third V-shaped sealing gasket 0335 . A second annular protrusion 0336 is arranged on the upper portion of the second V-shaped sealing gasket 0334 , which cooperates with the first annular groove 0337 of the second V-shaped sealing gasket 0334 on the upper layer.

[0038] A second annular groove 0339 is provided at the lower portion of the third V-shaped sealing gasket 0335 and matches with a second annular protrusion 0336 at the upper portion of the second V-shaped sealing gasket 0334 therebelow.

[0039] The sealing gasket forms a stable multi-layer structure, which is not easily squeezed and dislocated due to excessive pressure, thereby enhancing the sealing stability of the first stuffing box 033.

[0040] The sealing assembly 03 includes a second stuffing box 034 arranged above the stuffing box 1 032 and a stuffing box 2 031 matched with the second stuffing box 034, and the second stuffing box 034 is provided with: a first support ring 03410 with an I-shaped cross-section, and the first support ring 03410 is respectively provided with an annular groove 1 0342 and an annular groove 2 0343 on the side close to the valve stem 02 and the side away from the valve stem 02, and an O-ring 0347 is respectively provided in the annular groove 1 0342 and the annular groove 2 0343; the sealing performance is enhanced by the inner and outer double-layer sealing structure, and the O-ring 0347 is made of wear-resistant fluororubber material.

[0041] The second stuffing box 034 is provided with: a second support ring 03411 with an I-shaped cross section, an annular groove 3 0344 and an annular groove 4 0345 are respectively provided on the side of the second support ring 03411 close to the valve stem 02 and the side away from the valve stem 02, and a lip seal ring 0349 is respectively provided in the annular groove 3 0344 and the annular groove 4 0345; the sealing performance is enhanced by the inner and outer double-layer sealing structure. The lip seal ring 0349 is made of Elgiloy and PTFE. Elgiloy, Elgiloy corrosion-resistant hairspring alloy, PTFE, polytetrafluoroethylene, has the characteristics of high strength, high toughness, and corrosion resistance, and can adapt to the high-pressure and low-temperature environment of the deep sea.

[0042] The inner side of the lip-shaped sealing ring 0349 is wrapped with a second annular sealing ring 0348 with an ellipsoidal cross-section. The lower end of the second annular sealing ring 0348 is provided with an annular base 03412 with an inverted T-shaped cross-section. The annular base 03412 presses against the second annular sealing ring 0348. The second annular sealing ring 0348 is deformed while being pressed, exerting upward and sideways pressure on the lip-shaped sealing ring 0349, thereby enhancing its sealing performance.

[0043] A first threaded hole 0321 is provided on the packing gland 032, and the packing gland 032 is fixedly connected to the second support ring 03411 by bolts; a second threaded hole 0341 is provided on the first support ring 03410, and the packing gland 031 and the first support ring 03410 are fixedly connected by bolts; while ensuring a stable connection, it is easy to disassemble and install.

[0044] The utility model adopts a redundant and alternate sealing design. While providing reliable sealing performance, when one sealing structure is damaged or aged, causing the sealing ring to fail, the other sealing structures can still achieve a good sealing effect, thereby extending the service life of the equipment and achieving durability.

[0045] Example 2

[0046] Embodiment 2 is based on Embodiment 1, and is further configured as follows: at least two disc springs 0346 are provided between the first support ring 03410 and the second support ring 03411. While having a certain sealing performance, a certain elastic potential energy is accumulated, which can effectively overcome the problem of insufficient packing compression force under high pressure conditions, and provide pre-tightening force compensation for the first stuffing box 033 and the second stuffing box 034 when the fixed structure is loose, thereby increasing the service life of the sealing device.

[0047] Example 3

[0048] On the basis of Example 1, Example 3 is further provided with: a plurality of pressurized elastic members 03311 are provided on both sides of the conical clamping ring 0331, one end of the elastic member is fixedly connected to the lower part of the conical clamping ring 0331, and the other end abuts against the inner side of the first V-shaped sealing gasket 0333; the pressurized elastic member 03311 compresses and applies additional pressure to both sides of the first V-shaped sealing gasket 0333, thereby increasing the deformation degree of the outer annular protrusion 0332 and the inner annular protrusion 03310 and thus increasing its sealing effect.

[0049] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A redundant valve stem sealing device for an underwater valve, comprising a valve cover (01), a valve stem (02), and a sealing assembly (03) matched with the valve stem (02), characterized in that: The sealing assembly (03) includes a first stuffing box (033) and a stuffing gland (032) matched with the first stuffing box (033); a first V-shaped sealing gasket (0333), a second V-shaped sealing gasket (0334), and a third V-shaped sealing gasket (0335) are stacked from top to bottom in the first stuffing box (033); a conical clamping ring (0331) with a conical cross-section is arranged below the third V-shaped sealing gasket; the top of the conical clamping ring (0331) contacts and cooperates with the bottom of the third V-shaped sealing gasket (0335); at least two outer annular protrusions (0332) and two inner annular protrusions (03310) are arranged on both sides of the first V-shaped sealing gasket (0333); the outer annular protrusions (0332) contact the inner side of the first stuffing box (033), and the inner annular protrusions (03310) contact the valve stem (02).

2. The sealing device according to claim 1, characterized in that: The first V-shaped sealing gasket (0333) is provided with a first annular protrusion (0338) on the upper part, and the second V-shaped sealing gasket (0334) is provided with a first annular groove (0337) matching with the first annular protrusion (0338) on the lower part.

3. The sealing device according to claim 2, characterized in that: At least three second V-shaped sealing gaskets (0334) are arranged between the first V-shaped sealing gasket (0333) and the third V-shaped sealing gasket (0335), and a second annular protrusion (0336) is provided on the upper part of the second V-shaped sealing gasket (0334), and the second annular protrusion (0336) cooperates with the first annular groove (0337) of the second V-shaped sealing gasket (0334) above it.

4. The sealing device according to claim 3, characterized in that: The third V-shaped sealing gasket (0335) has a second annular groove (0339) at the bottom thereof, which cooperates with the second annular protrusion (0336) at the top of the second V-shaped sealing gasket (0334) below it.

5. The sealing device according to claim 1, characterized in that: The sealing assembly (03) comprises a second stuffing box (034) arranged above a stuffing box cover 1 (032) and a stuffing box cover 2 (031) matched with the second stuffing box (034); the second stuffing box (034) is provided with: a first support ring (03410) with an I-shaped cross section; the first support ring (03410) is provided with an annular groove 1 (0342) and an annular groove 2 (0343) on the side close to the valve stem (02) and the side away from the valve stem (02), respectively; and O-rings (0347) are provided in both the annular groove 1 (0342) and the annular groove 2 (0343).

6. The sealing device according to claim 5, characterized in that: The second stuffing box (034) is provided with: a second support ring (03411) with an I-shaped cross section; an annular groove three (0344) and an annular groove four (0345) are respectively provided on the side of the second support ring (03411) close to the valve stem (02) and the side away from the valve stem (02); lip sealing rings (0349) are respectively provided in the annular groove three (0344) and the annular groove four (0345).

7. The sealing device according to claim 6, characterized in that: The inner side of the lip-shaped sealing ring (0349) is wrapped with a second annular sealing ring (0348) with an ellipsoidal cross-section, and the lower end of the second annular sealing ring (0348) is provided with an annular base (03412) with an inverted T-shaped cross-section, and the annular base (03412) presses against the second annular sealing ring (0348).

8. The sealing device according to claim 6, characterized in that: The packing gland one (032) is provided with a first threaded hole (0321), and the packing gland one (032) and the second support ring (03411) are fixedly connected by bolts; the first support ring (03410) is provided with a second threaded hole (0341), and the packing gland two (031) and the first support ring (03410) are fixedly connected by bolts.

9. The sealing device according to claim 6, characterized in that: At least two disc springs (0346) are provided between the first support ring (03410) and the second support ring (03411).

10. The sealing device according to claim 1, characterized in that: A plurality of pressurized elastic members (03311) are provided on both sides of the conical clamping ring (0331), one end of the pressurized elastic member is fixedly connected to the lower part of the conical clamping ring (0331), and the other end is abutted against the inner side of the first V-shaped sealing gasket (0333).

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