Valve rod sealing structure and valve

Abstract

The utility model provides a valve rod sealing structure and a valve. A valve rod sealing structure comprises a backing ring, a graphite rope, a shaft sleeve, a plurality of first O-shaped rings, a plurality of first check rings, a plurality of second check rings and a plurality of second O-shaped rings, the graphite rope is installed on the backing ring, the bottom of the shaft sleeve abuts against the backing ring, the first O-shaped rings and the first check rings are installed on the inner side of the shaft sleeve, and the second check rings are installed on the outer side of the shaft sleeve. The multiple first check rings and the multiple second check rings are installed on the outer side of the shaft sleeve. A check ring is additionally arranged at the tail end of the O-shaped ring to prevent blowing-away deformation under the action of high pressure. And the check ring is additionally arranged, so that the service life of the O-shaped ring under high pressure can be prolonged, and the service life of the valve is further prolonged. The sealing structure can be applied to a gas transmission pipeline main line cut-off valve for a long time, and the risk of field valve rod sealing leakage is reduced. The problem of sealing leakage of a natural gas long-distance pipeline trunk cut-off valve rod is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to natural gas conveying valve technical field especially valve rod sealing structure and valve. BACKGROUND

[0002] The valve rod sealing leakage problem of natural gas long distance pipeline trunk cut-off valve appears in recent years, the Y-shaped flooding seal selected in the original technology can only be used on the liquid medium valve, is not applicable to the environment of high pressure gas medium, requires particularly high contact surface finish, once the finish is not up to the standard, the sealing effect is greatly reduced, the original valve selects the O-shaped ring line diameter 3.5mm, the compression amount is small, once the processing error is too large, the sealing can not be realized, and only one sealing pair is used inside and outside, once the failure occurs, the leakage appears immediately, the top expanded graphite is fixed between the two metal rings by screw, the graphite packing needs to be expanded by tightening the screw, and the graphite packing can not be compressed to continue to open outward, so that the sealing effect of the structure is poor. SUMMARY

[0003] The utility model relates to a valve rod sealing structure and valve that solve the technical problems of the prior art.

[0004] The utility model discloses a valve rod sealing structure, including: ring, graphite rope, shaft sleeve, a plurality of first O-shaped ring, a plurality of first check ring, a plurality of second check ring, a plurality of second O-shaped ring, the graphite rope is installed on the ring, the bottom of the shaft sleeve is in contact with the ring, a plurality of first O-shaped ring and a plurality of first check ring are installed on the inside of the shaft sleeve, a plurality of first check ring and a plurality of second check ring are installed on the outside of the shaft sleeve.

[0005] The beneficial effects of the utility model technical scheme are that the O-shaped ring tail end is equipped with a check ring to prevent deformation under high pressure. The sealing property and reliability of the valve are improved, and the check ring is added to prolong the service life of the O-shaped ring under high pressure, thereby prolonging the service life of the valve. The sealing structure can be applied to the gas pipeline trunk cut-off valve for a long time, reducing the risk of valve rod sealing leakage. The valve rod sealing leakage problem of the natural gas long distance pipeline trunk cut-off valve is solved.

[0006] Further, a plurality of first check rings correspond one-to-one to a plurality of first O-shaped rings, and a plurality of second check rings correspond one-to-one to a plurality of second O-shaped rings.

[0007] The beneficial effects of the above further technical scheme are that the O-shaped ring tail end is equipped with a check ring to prevent deformation under high pressure.

[0008] Further, the ring and the shaft sleeve are located in the shaft hole of the valve body.

[0009] The beneficial effects of the above further technical solutions are: improve the sealing and reliability of the valve, and increase the check ring, which can prolong the service life of the O-ring under high pressure, thereby prolonging the service life of the valve.

[0010] Further, the inner side of the shaft sleeve is provided with a plurality of shaft sleeve inner diameter grooves, a plurality of the first O-rings are installed one by one in the plurality of shaft sleeve inner diameter grooves, and a plurality of the first check rings are installed one by one in the plurality of shaft sleeve inner diameter grooves; the outer side of the shaft sleeve is provided with a plurality of shaft sleeve outer diameter grooves, a plurality of the second O-rings are installed one by one in the plurality of shaft sleeve outer diameter grooves, and a plurality of the second check rings are installed one by one in the plurality of shaft sleeve outer diameter grooves.

[0011] The beneficial effects of the above further technical solutions are: the arrangement of the shaft sleeve inner diameter grooves and the shaft sleeve outer diameter grooves facilitates the installation and maintenance of the O-rings and the check rings, and the O-ring tail end is additionally provided with a check ring to prevent deformation under high pressure.

[0012] Further, the plurality of shaft sleeve inner diameter grooves and the plurality of shaft sleeve outer diameter grooves are staggered.

[0013] The beneficial effects of the above further technical solutions are: the inner and outer ring grooves of the shaft sleeve are staggered, which can avoid reducing the width of the shaft sleeve and ensure the strength based on the original structure.

[0014] Further, the first check ring and the second check ring are arranged away from the side of the sphere, and the diameter of the first O-ring and the second O-ring is 5.7mm.

[0015] The beneficial effects of the above further technical solutions are: the O-ring tail end is additionally provided with a check ring to prevent deformation under high pressure. The sealing and reliability of the valve are improved, and the check ring is increased, which can prolong the service life of the O-ring under high pressure, thereby prolonging the service life of the valve.

[0016] Further, the top of the grommet is provided with a protrusion, the protrusion is provided with a disassembly and assembly threaded hole, and the bottom of the shaft sleeve is provided with a ring groove matched with the protrusion.

[0017] The beneficial effects of the above further technical solutions are: the upper surface of the grommet is protruding and designed with a disassembly and assembly threaded hole, which is convenient for disassembly and assembly in the future.

[0018] Further, the grommet is provided with a grommet inner groove and a grommet outer groove, the graphite rope is installed in the grommet inner groove and the grommet outer groove respectively, the two sides of the ring groove are provided with supporting feet, and the supporting feet abut against the graphite rope.

[0019] The beneficial effect of the further technical scheme is that the graphite rope is installed in the inner and outer grooves to play a fireproof sealing role.

[0020] Further, the graphite rope is located at the top or bottom of the inner groove and the outer groove.

[0021] The beneficial effect of the further technical scheme is that the graphite rope can be placed at the lowermost part or the uppermost part, and the sealing effect on the valve rod part is the same, which facilitates the user to select the installation position of the graphite rope according to actual needs.

[0022] In addition, the utility model provides a valve, including the valve rod sealing structure of any one of the above.

[0023] The beneficial effect of the technical scheme of the utility model is that the O-shaped ring tail end is additionally provided with a check ring to prevent deformation under high pressure. The sealing property and reliability of the valve are improved, and the check ring is added to prolong the service life of the O-shaped ring under high pressure, thereby prolonging the service life of the valve. The sealing structure can be applied to the gas pipeline trunk cutoff valve for a long time, reduces the risk of valve rod sealing leakage in the field, and solves the problem of valve rod sealing leakage of the natural gas long-distance pipeline trunk cutoff valve.

[0024] The advantages of the additional aspects of the utility model will be partially given in the following description, some will become obvious from the following description, or will be understood through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The structure diagram of the valve rod sealing structure provided by the utility model embodiment is shown.

[0026] Explanation of reference numerals: 1, grommet; 2, graphite rope; 3, shaft sleeve; 4, first O-shaped ring; 5, first check ring; 6, second check ring; 7, second O-shaped ring. DETAILED DESCRIPTION

[0027] The principles and characteristics of the utility model are described below in combination with the drawings, and the examples are only used to explain the utility model and are not used to limit the scope of the utility model.

[0028] As Figure 1The utility model discloses an embodiment provides a valve rod sealing structure, include: gasket ring 1, graphite rope 2, shaft sleeve 3, a plurality of first O ring 4, a plurality of first check ring 5, a plurality of second check ring 6, a plurality of second O ring 7, graphite rope 2 is installed on gasket ring 1, the bottom of shaft sleeve 3 with gasket ring 1 abuts, a plurality of first O ring 4 and a plurality of first check ring 5 are installed in the inside of shaft sleeve 3, a plurality of first check ring 5 and a plurality of second check ring 6 are installed in the outside of shaft sleeve 3.

[0029] The beneficial effects of the technical scheme are that: the O-ring tail end is additionally provided with a check ring to prevent deformation under high pressure. The valve sealing performance and reliability are improved, and the check ring is added to prolong the service life of the O-ring under high pressure, thereby prolonging the service life of the valve. The sealing structure can be applied to the gas pipeline trunk block valve for a long time, reducing the risk of valve rod sealing leakage on site. The problem of valve rod sealing leakage of the natural gas long-distance pipeline trunk block valve is solved.

[0030] The valve rod sealing structure can be a new type of valve rod sealing structure, improve the sealing performance and reliability of the valve, and add a check ring to prolong the service life of the O-ring under high pressure, thereby prolonging the service life of the valve. The problem of valve rod sealing leakage of the natural gas long-distance pipeline trunk block valve is solved.

[0031] The problems of the original valve rod sealing structure in the on-site use process are analyzed, and a sealing structure (a valve rod sealing structure) capable of being applied to the gas pipeline trunk block valve for a long time is designed and manufactured, which reduces the risk of valve rod sealing leakage on site and prolongs the service life of the valve.

[0032] As shown in Figure 1 Further, the first check ring 5 corresponds to the first O-ring 4, and the second check ring 6 corresponds to the second O-ring 7.

[0033] The beneficial effects of the above further technical scheme are that: the O-ring tail end is additionally provided with a check ring to prevent deformation under high pressure.

[0034] As shown in Figure 1 Further, the gasket ring 1 and the shaft sleeve 3 are located in the shaft hole of the valve body.

[0035] The beneficial effects of the above further technical scheme are that: the valve sealing performance and reliability are improved, and the check ring is added to prolong the service life of the O-ring under high pressure, thereby prolonging the service life of the valve.

[0036] As shown in Figure 1As shown, further, the inner side of the shaft sleeve 3 is provided with a plurality of shaft sleeve inner diameter grooves, a plurality of the first O-rings 4 are installed in the plurality of shaft sleeve inner diameter grooves one by one, and a plurality of the first retaining rings 5 are installed in the plurality of shaft sleeve inner diameter grooves one by one; the outer side of the shaft sleeve 3 is provided with a plurality of shaft sleeve outer diameter grooves, a plurality of the second O-rings 7 are installed in the plurality of shaft sleeve outer diameter grooves one by one, and a plurality of the second retaining rings 6 are installed in the plurality of shaft sleeve outer diameter grooves one by one.

[0037] The beneficial effect of the above further technical solution is that the arrangement of the shaft sleeve inner diameter grooves and the shaft sleeve outer diameter grooves facilitates the installation and maintenance of the O-rings and the retaining rings, and the retaining rings added to the tail ends of the O-rings prevent deformation and blowing away under high pressure.

[0038] As shown in the drawings, Figure 1 Further, the plurality of shaft sleeve inner diameter grooves and the plurality of shaft sleeve outer diameter grooves are staggered.

[0039] The beneficial effect of the above further technical solution is that the staggered arrangement of the shaft sleeve inner and outer ring grooves can avoid reducing the width of the shaft sleeve and ensure the strength on the basis of the original structure.

[0040] As shown in the drawings, Figure 1 Further, the first retaining ring 5 and the second retaining ring 6 are arranged away from the side of the sphere, and the diameters of the first O-ring 4 and the second O-ring 7 are 5.7 mm.

[0041] The beneficial effect of the above further technical solution is that the retaining rings added to the tail ends of the O-rings prevent deformation and blowing away under high pressure. The sealing and reliability of the valve are improved, and the service life of the O-rings under high pressure is prolonged, thereby prolonging the service life of the valve.

[0042] As shown in the drawings, Figure 1 Further, the top of the grommet 1 is provided with a protrusion, the protrusion is provided with a disassembly and assembly threaded hole, and the bottom of the shaft sleeve 3 is provided with a ring groove matched with the protrusion.

[0043] The beneficial effect of the above further technical solution is that the upper surface of the grommet is protruding and designed with a disassembly and assembly threaded hole, which facilitates future disassembly and assembly.

[0044] As shown in the drawings, Figure 1 Further, the grommet 1 is provided with a grommet inner groove and a grommet outer groove, the graphite rope 2 is installed in the grommet inner groove and the grommet outer groove respectively, the ring groove 3 is provided with support feet on both sides, and the support feet abut against the graphite rope 2.

[0045] The beneficial effect of the above further technical solution is that the graphite rope is installed in the inner and outer grooves, which plays a fireproof sealing role. The shaft sleeve is provided with a ring groove at the bottom, and the support feet on both sides of the ring groove can press the graphite rope.

[0046] As Figure 1 Further, the graphite rope 2 is located at the top or bottom of the inner groove and the outer groove.

[0047] The beneficial effects of the above further technical solutions are that the graphite rope can be placed at the lowermost part or the uppermost part, and the sealing effect on the valve rod part is the same, facilitating users to select the installation position of the graphite rope according to actual needs.

[0048] The valve rod sealing structure is manufactured and installed, pressure test is carried out in a valve factory, the test result is qualified, and the practical use effect of the valve rod sealing structure is good.

[0049] (1) Clean the impurities at the sealing part of the shaft sleeve hole, polish and remove rust, and clean and dry;

[0050] (2) Install the graphite rope 2 for fireproof sealing in the inner and outer stopper of the gasket ring 1, and then install; install O-shaped seals (first O-shaped ring 4) and retaining rings (first retaining ring 5, note that the position of the retaining ring is away from the spherical side) in the inner diameter groove of the shaft sleeve 3 according to the designed number; install O-shaped seals (second O-shaped ring 7) and retaining rings (second retaining ring 6, note that the position of the retaining ring is away from the spherical side) in the outer diameter groove according to the designed number.

[0051] (3) Install the entire shaft sleeve assembly into the shaft hole of the valve body.

[0052] (4) Install the coupling disc back, connect with the inner hexagonal bolt, and tighten according to the requirements.

[0053] (5) Pressurize the pipeline, half open the valve, and perform shell strength test, focusing on checking whether the valve rod sealing part leaks, according to the shell high-pressure air sealing test standard API 6D, provide 1.1 times the rated pressure, and maintain pressure for 5 minutes, spray soap water at the gap of the valve rod at the top of the valve, and visually observe whether bubbles are generated, and if no obvious bubbles are generated, it is qualified.

[0054] On the basis of the original structure, a ring gasket (gasket ring 1) is added, the upper surface of the ring gasket is convex and is designed with dismounting screw holes, which is convenient for dismounting in the future; graphite ropes are arranged in the inner and outer grooves for fireproof sealing, the graphite seal (graphite rope) can be placed at the lowermost part or the uppermost part, and the sealing effect on the valve rod part is the same; a shaft sleeve 3 is installed at the top, the shaft sleeve is provided with a ring groove at the bottom, and the supporting feet on both sides of the ring groove can press the graphite rope 2 tightly; two ring grooves are arranged in the inner and outer shaft sleeves, and O-shaped rings (first O-shaped ring and second O-shaped ring) with a diameter of 5.7 mm are arranged in the ring grooves, the inner and outer ring grooves of the shaft sleeve are arranged alternately, which can avoid reducing the width of the shaft sleeve and ensure the strength on the basis of the original structure, and retaining rings are additionally arranged at the tail ends of the O-shaped rings to prevent deformation under high pressure.

[0055] In addition, the utility model still provides a valve, including the valve rod sealing structure of any one of above.

[0056] The beneficial effect of the technical scheme of the utility model is that the O-shaped ring tail end is additionally equipped with a check ring to prevent deformation under the action of high pressure. The sealing property and reliability of the valve are improved, the check ring is added, the service life of the O-shaped ring under high pressure is prolonged, and the service life of the valve is further prolonged. The sealing structure can be applied to the gas pipeline trunk block valve for a long time, the risk of valve rod sealing leakage in the field is reduced, and the natural gas long-distance pipeline trunk block valve rod sealing leakage problem is solved.

[0057] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A valve stem seal structure, characterized by, The valve rod sealing structure comprises a gasket ring, a graphite rope, a shaft sleeve, a plurality of first O-rings, a plurality of first retaining rings, a plurality of second retaining rings, and a plurality of second O-rings. The plurality of first retaining rings correspond one-to-one to the plurality of first O-rings, and the plurality of second retaining rings correspond one-to-one to the plurality of second O-rings.

2. A valve stem seal assembly as defined in claim 1, wherein, The gasket ring and the shaft sleeve are located in a shaft hole of a valve body.

3. A valve stem seal assembly as defined in claim 1, wherein, The inner side of the shaft sleeve is provided with a plurality of shaft sleeve inner diameter grooves, and the plurality of first O-rings are installed one-to-one in the plurality of shaft sleeve inner diameter grooves.

4. The valve stem seal assembly of claim 1, wherein, The outer side of the shaft sleeve is provided with a plurality of shaft sleeve outer diameter grooves, and the plurality of second O-rings are installed one-to-one in the plurality of shaft sleeve outer diameter grooves.

5. A valve stem seal assembly as defined in claim 4, wherein, The plurality of shaft sleeve inner diameter grooves and the plurality of shaft sleeve outer diameter grooves are staggered.

6. A valve stem seal assembly as defined in claim 4, wherein, The first retaining ring and the second retaining ring are both arranged away from the side of the ball, and the line diameter of the first O-ring and the second O-ring is 5.7 mm.

7. A valve stem seal assembly as defined in claim 1, wherein, The top of the gasket ring is provided with a protrusion, and the protrusion is provided with a disassembly screw hole.

8. A valve stem seal assembly as defined in claim 7, wherein, The gasket ring is provided with a gasket ring inner groove and a gasket ring outer groove, and the graphite rope is installed in the gasket ring inner groove and the gasket ring outer groove, respectively.

9. A valve stem seal assembly as defined in claim 8, wherein, The graphite rope is located at the top or the bottom of the inner groove and the outer groove.

10. A valve characterized by, The valve rod sealing structure comprises a gasket ring, a graphite rope, a shaft sleeve, a plurality of first O-rings, a plurality of first retaining rings, a plurality of second retaining rings, and a plurality of second O-rings. The plurality of first retaining rings correspond one-to-one to the plurality of first O-rings, and the plurality of second retaining rings correspond one-to-one to the plurality of second O-rings. The gasket ring and the shaft sleeve are located in a shaft hole of a valve body. The inner side of the shaft sleeve is provided with a plurality of shaft sleeve inner diameter grooves, and the plurality of first O-rings are installed one-to-one in the plurality of shaft sleeve inner diameter grooves. The outer side of the shaft sleeve is provided with a plurality of shaft sleeve outer diameter grooves, and the plurality of second O-rings are installed one-to-one in the plurality of shaft sleeve outer diameter grooves. The plurality of shaft sleeve inner diameter grooves and the plurality of shaft sleeve outer diameter grooves are staggered. The first retaining ring and the second retaining ring are both arranged away from the side of the ball, and the line diameter of the first O-ring and the second O-ring is 5.7 mm. The top of the gasket ring is provided with a protrusion, and the protrusion is provided with a disassembly screw hole. The gasket ring is provided with a gasket ring inner groove and a gasket ring outer groove, and the graphite rope is installed in the gasket ring inner groove and the gasket ring outer groove, respectively.

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