A sealing structure for a pressure regulating valve seat of a pressure regulator

Abstract

The present invention discloses a sealing structure of a pressure regulating valve seat of a pressure regulator, which belongs to the technical field of pressure regulators. The sealing structure includes a first annular groove and a second annular groove relatively arranged on the valve seat and the valve core, the first annular groove and the second annular groove are both trapezoidal structures, a valve gasket is inlaid in the first annular groove, annular convex rings are arranged on both sides of the upper end of the valve gasket, a basalt fiber layer is arranged inside the annular convex ring, and the basalt fiber layer is arranged along the outer wall of the annular convex ring. When sealing, the valve core drives the second annular groove to move downward, and the groove walls on both sides of the second annular groove are respectively pressed against the outer walls of the two annular convex rings, so that seals in both axial and radial directions are formed on both sides of the valve seat, the seal is more stable, and the overall stability of the pressure regulator is improved. Even if problems caused by factors such as processing accuracy and cumulative errors after assembly occur, the valve seat will be in parallel contact with the valve core, thereby ensuring the sealing contact between the valve seat and the valve core.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure regulators, and in particular to a sealing structure of a pressure regulating valve seat of a pressure regulator. Background Art

[0002] The pressure regulator is the main device for regulating gas pressure. The sealing structure of the existing gas pressure regulator adopts a flat surface plus a rubber sealing ring. The sealing ring only withstands the extrusion force in the vertical direction. Long-term vertical extrusion and corrosion from natural gas will cause the sealing ring to deform and be damaged. At the same time, the force direction of the valve seat seal is unidirectional, which is easily affected by the processing accuracy of the sealing surface of the parts, resulting in a loose seal. Summary of the Invention

[0003] Based on this, the present invention provides a sealing structure of a pressure regulating valve seat of a pressure regulator, the sealing structure including a first annular groove and a second annular groove relatively arranged on the valve seat and the valve core, the second annular groove being a trapezoidal structure, a valve gasket being inlaid in the first annular groove, and annular convex rings being arranged on both sides of the upper end of the valve gasket, when sealing, the groove walls on both sides of the second annular groove are respectively pressed against the outer side walls of the two annular convex rings, so that seals in both axial and radial directions are formed on both sides of the valve seat, the sealing surface is less affected by the processing accuracy, the seal is more stable, and the overall stability of the pressure regulator is improved.

[0004] The technical solution adopted in the present invention is:

[0005] A sealing structure for a pressure regulating valve seat of a pressure regulator comprises a valve body, a valve seat, a valve core and a valve stem arranged in the valve body, wherein the valve stem can drive the valve core to move up and down to realize opening and closing of the valve seat;

[0006] The upper surface of the valve seat is provided with a first annular groove; the lower surface of the valve core is provided with a second annular groove opposite to the first annular groove, and the second annular groove is a trapezoidal structure;

[0007] A valve pad is embedded in the first annular groove, and annular convex rings are provided on both sides of the upper end of the valve pad, and the cross section of the annular convex ring is hemispherical;

[0008] A basalt fiber layer is provided inside the annular bead, and the basalt fiber layer is provided along the outer side wall of the annular bead;

[0009] When the valve stem moves downward, the valve core drives the second annular groove to move downward, and the groove walls on both sides of the second annular groove are respectively pressed against the outer side walls of the two annular protrusions, so that both the inner and outer sides of the valve seat form seals in both axial and radial directions; when the valve stem moves upward, the valve core drives the second annular groove to move upward, away from the valve pad, to open the valve seat.

[0010] In the sealing structure disclosed in the present application, the first annular groove also has a trapezoidal structure.

[0011] In the sealing structure disclosed in the present application, the valve seat has a fixing portion, and the annular protrusions are located on both sides of the upper end of the fixing portion; the cross section of the fixing portion is trapezoidal and is adapted to the first annular groove.

[0012] In the sealing structure disclosed in the present application, the fixing portion is interference fit with the first annular groove.

[0013] In the sealing structure disclosed in this application, the preparation method of the valve gasket is:

[0014] Step S1. The pre-sizing material is passed through a first mold to form a fixed portion;

[0015] Step S2. Adding chopped basalt fiber to the pre-size is passed through a second mold to form an annular bead preform; basalt fiber gauze is impregnated in the glue, attached to the surface of the annular bead preform, and cured to obtain an annular bead matrix;

[0016] Step S3: Place the fixing portion and the annular bead base into a valve gasket mold, inject the pre-sizing compound containing chopped basalt fibers into the mold, and then place the valve gasket mold in a vulcanizer for vulcanization molding to obtain a valve gasket.

[0017] In the sealing structure disclosed in the present application, the pre-sizing material includes 90-100 parts of fluororubber, 1-5 parts of nano-silicon dioxide, 20-40 parts of carbon black, and 15-40 parts of additives.

[0018] In the sealing structure disclosed in the present application, the added amount of the chopped basalt fibers is 1-5%.

[0019] In the sealing structure disclosed in the present application, the ratio of the radius of the annular bead preform to the radius of the annular bead is 0.5-0.7.

[0020] In the sealing structure disclosed in the present application, the basalt fiber gauze is basalt fiber roving.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The sealing structure of the present application forms seals in both axial and radial directions on both the inner and outer sides of the sealing surface between the valve core and the valve seat. The sealing surface is less affected by machining accuracy, the seal is more stable, and the overall stability of the pressure regulator is improved. The groove walls on both sides of the second annular groove are respectively pressed against the outer side walls of the two annular convex rings. Even if problems arise due to machining accuracy and accumulated errors after assembly, the valve seat will be in parallel contact with the valve core, thereby ensuring the sealing contact between the valve seat and the valve core. Short-cut basalt fibers are added to the annular convex ring of the valve gasket of the present application, and basalt fiber roving is buried along the outer side wall of the annular convex ring, which improves the mechanical properties of the annular convex ring and increases the service life of the valve gasket. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] Figure 1 It is a structural diagram of the voltage regulator;

[0025] Figure 2 for Figure 1 A magnified view of point A;

[0026] Figure 3 This is a schematic diagram of the sealing structure of this application;

[0027] Figure 4 It is a force diagram of the existing sealing structure;

[0028] Figure 5 This is a force diagram of the sealing structure of this application;

[0029] Figure 6 This is a schematic diagram of the structure of the valve gasket of this application.

[0030] Reference numerals:

[0031] 10. Pressure regulator; 11. Valve body; 12. Valve core; 13. Valve seat; 14. Valve stem; 15. Diaphragm; 16. Return spring; 17. Sealing ring;

[0032] 20. Sealing structure; 21. First annular groove; 22. Second annular groove; 23. Valve gasket; 24. Annular bead; 25. Basalt fiber layer; 26. Fixing portion. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. It will be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some, rather than all, structures related to the present application are shown in the accompanying drawings. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0034] As used herein, the terms "comprise," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification are intended only to describe specific embodiments and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0037] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0038] This application discloses a sealing structure for a pressure regulating valve seat of a pressure regulator, see Figure 1As shown, the pressure regulator 10 includes a valve body 11, a valve core 12, a valve seat 13, a valve stem 14, a sealing ring 17, a diaphragm 15, a pilot (not shown), a return spring 16, etc. The pilot can control the pressure in the upper and lower chambers of the diaphragm 15. When the pressure in the lower chamber of the diaphragm 15 is greater than the pressure in the upper chamber of the diaphragm 15, the valve stem 14 moves upward, and the valve core 12 is separated from the valve seat 13 under the push of the valve stem 14, thereby opening the valve. When the pressure in the upper chamber of the diaphragm 15 is greater than the pressure in the lower chamber of the diaphragm 15, the valve stem 14 moves downward, and the valve core 12 is pressed against the sealing ring 17 of the valve seat 13 under the action of the return spring 16, thereby closing the valve. Figure 2 、 4 As shown, the sealing structure of the pressure regulating valve seat of the existing pressure regulator adopts a flat surface plus a rubber sealing ring 17 for sealing. The sealing ring 17 only bears the extrusion force in the vertical direction, so it only seals in the vertical direction. Long-term vertical extrusion and corrosion of natural gas will cause the sealing ring 17 to deform and be damaged. At the same time, the sealing force direction of the valve seat 13 is unidirectional, which is easily affected by the processing accuracy of the sealing surface of the parts, resulting in a loose seal.

[0039] Based on this, see Figure 3 、 5 As shown in Figures 6 and 6, an embodiment of the present application provides a sealing structure of a pressure regulating valve seat of a pressure regulator, wherein the upper surface of the valve seat 13 is provided with a first annular groove 21, and the lower surface of the valve core 12 is provided with a second annular groove 22 opposite to the first annular groove 21, and the second annular groove 22 is a trapezoidal structure.

[0040] A valve gasket 23 is embedded in the first annular groove 21 . Annular protrusions 24 are provided on both sides of the upper end of the valve gasket 23 . The cross section of the annular protrusions 24 is hemispherical.

[0041] When the valve stem 14 moves downward, the valve core 12 drives the second annular groove 22 to move downward. The groove walls on both sides of the second annular groove 22 are respectively pressed against the outer side walls of the two annular protrusions 24, so that the inner and outer sides of the valve seat 13 form a seal in both axial and radial directions (see Figure 5 As shown); when the valve stem 14 moves upward, the valve core 12 drives the second annular groove 22 to move upward, away from the valve pad 23, thereby opening the valve seat 13.

[0042] In order to improve the mechanical properties of the annular bead 24, a basalt fiber layer 25 is set inside the annular bead 24. The basalt fiber layer 25 is set along the outer wall of the annular bead 24 to resist the pressure of the valve core 12, improve the strength of the annular bead 24, and increase the service life of the valve gasket 23.

[0043] The sealing structure 20 of the present application enables the sealing surfaces of the valve core 12 and the valve seat 13 to form seals in both axial and radial directions on both the inner and outer sides, thereby minimizing the influence of the material on the seal, making the seal more stable, and improving the overall stability of the pressure regulator 10; the groove walls on both sides of the second annular groove 22 are respectively pressed against the outer side walls of the two annular protrusions 24, and even if problems occur due to factors such as processing accuracy and cumulative errors after assembly, the valve seat 13 will be in parallel contact with the valve core 12, thereby ensuring the sealing contact between the valve seat 13 and the valve core 12.

[0044] In one embodiment, the first annular groove 21 is also a trapezoidal structure. The valve gasket 23 is embedded in the first annular groove 21. The trapezoidal structure prevents the valve gasket 23 from being squeezed when pressed, thereby ensuring the integrity of the sealing structure 20.

[0045] In one embodiment, the valve seat 13 has a fixing portion 26, with annular protrusions 24 located on either side of the upper end of the fixing portion 26. The fixing portion 26 has a trapezoidal cross-section and fits perfectly within the first annular groove 21. Furthermore, the fixing portion 26 and the first annular groove 21 form an interference fit, providing a strong coupling force that effectively overcomes the pressure of the valve core 12 and prevents the valve core from being pulled out, thereby effectively ensuring a tight seal on the valve.

[0046] In one embodiment, the valve gasket is prepared by:

[0047] Step S1: Pass a pre-sizing compound through a first mold to form a fixing portion. The pre-sizing compound comprises 90-100 parts of fluororubber, 1-5 parts of nano-silicon dioxide, 20-40 parts of carbon black, and 15-40 parts of an additive.

[0048] Step S2. A pre-sizing material containing chopped basalt fibers is passed through a second mold to form an annular bead preform. Basalt fiber gauze is impregnated with the glue solution and then attached to the surface of the annular bead preform to form a basalt fiber layer. This is then cured to form an annular bead matrix. The ratio of the radius of the annular bead preform to the radius of the annular bead is 0.5-0.7, so that the basalt fiber layer is close to the outer wall of the annular bead, enhancing the compressive strength of the annular bead. The chopped basalt fibers are added in an amount of 1-5%, preferably 3%. The basalt fiber gauze is basalt fiber roving. Adding chopped basalt fibers to the pre-sizing material of the annular bead and embedding the basalt fiber layer within the annular bead improves the mechanical properties of the annular bead.

[0049] Step S3: Place the fixing portion and the annular bead base into a valve gasket mold, inject the pre-sizing compound containing chopped basalt fibers into the mold, and then place the valve gasket mold in a vulcanizer for vulcanization molding to obtain a valve gasket.

[0050] In a specific embodiment, the valve gasket has a tensile strength of 24.5 MPa and a tear strength of 35.7 KN / m.

[0051] Based on the above embodiments, the sealing structure of the embodiment of the present invention has the following advantages:

[0052] The sealing structure 20 of the present application enables the sealing surfaces of the valve core 12 and the valve seat 13 to form seals in both axial and radial directions on both the inner and outer sides, thereby minimizing the influence of the material on the seal, making the seal more stable, and improving the overall stability of the pressure regulator 10; the groove walls on both sides of the second annular groove 22 are respectively pressed against the outer side walls of the two annular protrusions 24, and even if problems occur due to factors such as processing accuracy and cumulative errors after assembly, the valve seat 13 will be in parallel contact with the valve core 12, thereby ensuring the sealing contact between the valve seat 13 and the valve core 12.

[0053] The annular bead 24 of the valve gasket of the present application is added with short-cut basalt fibers, and basalt fiber rovings are buried along the outer wall of the annular bead, thereby improving the mechanical properties of the annular bead 24 and increasing the service life of the valve gasket 23.

[0054] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A sealing structure for a pressure regulating valve seat of a pressure regulator, comprising a valve body, a valve seat, a valve core, and a valve stem disposed within the valve body, wherein the valve stem drives the valve core to move up and down to open and close the valve seat, and is characterized in that: The upper surface of the valve seat is provided with a first annular groove; the lower surface of the valve core is provided with a second annular groove opposite to the first annular groove, and the second annular groove is a trapezoidal structure; A valve pad is embedded in the first annular groove, and annular convex rings are provided on both sides of the upper end of the valve pad, and the cross section of the annular convex ring is hemispherical; A basalt fiber layer is provided inside the annular bead, and the basalt fiber layer is provided along the outer side wall of the annular bead; When the valve stem moves downward, the valve core drives the second annular groove to move downward, and the groove walls on both sides of the second annular groove are respectively pressed against the outer side walls of the two annular protrusions, so that both the inner and outer sides of the valve seat form a seal in both axial and radial directions; when the valve stem moves upward, the valve core drives the second annular groove to move upward, away from the valve pad, so that the valve seat is opened; Wherein, the valve seat has a fixed portion, and the annular protrusions are located on both sides of the upper end of the fixed portion; The preparation method of the valve gasket is as follows: Step S1. Passing the pre-sizing material through a first mold to form a fixed portion; Step S2: passing the pre-sizing material added with chopped basalt fibers through a second mold to produce an annular bead preform; impregnating the basalt fiber gauze in the glue solution, attaching it to the surface of the annular bead preform, and curing it to obtain an annular bead matrix; Step S3: Place the fixing portion and the annular bead base into a valve gasket mold, inject and fill the mold with pre-sizing material added with chopped basalt fibers, and then place the valve gasket mold in a vulcanizer for vulcanization molding to obtain a valve gasket.

2. The sealing structure of the pressure regulating valve seat of the pressure regulator according to claim 1, characterized in that: The first annular groove also has a trapezoidal structure.

3. The sealing structure of the pressure regulating valve seat of the pressure regulator according to claim 2, characterized in that: The cross section of the fixing portion is trapezoidal and is adapted to the first annular groove.

4. The sealing structure of the pressure regulating valve seat of the pressure regulator according to claim 3, characterized in that: The fixing portion is interference fit with the first annular groove.

5. The sealing structure of the pressure regulating valve seat of the pressure regulator according to claim 1, characterized in that: The pre-sizing material comprises 90-100 parts of fluororubber, 1-5 parts of nano-silicon dioxide, 20-40 parts of carbon black, and 15-40 parts of additives.

6. The sealing structure of the pressure regulating valve seat of the pressure regulator according to claim 1, characterized in that: The addition amount of the chopped basalt fiber is 1-5%.

7. The sealing structure of the pressure regulating valve seat of the pressure regulator according to claim 1, characterized in that: The ratio of the radius of the annular bead preform to the radius of the annular bead is 0.5-0.

7.

8. The sealing structure of the pressure regulating valve seat of the pressure regulator according to claim 1, characterized in that: The basalt fiber gauze is basalt fiber roving.

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