CN210770630U - Be applied to bellows subassembly welded structure of bellows stop valve - Google Patents

Abstract

The utility model discloses a be applied to bellows subassembly welded structure of bellows stop valve, welded structure cover are established on the valve rod, include by first valve bonnet ring, bellows, the second valve bonnet ring that sets gradually on going. The two ends of the corrugated pipe extend along the length direction of the corrugated pipe to form a straight pipe section, the pipe opening of the straight pipe section is provided with annular end faces, and the annular end faces at the two ends of the corrugated pipe are in contact with and attached to the lower surface of the second valve cover ring or the upper surface of the first valve cover ring. The first valve cover ring and the second valve cover ring both comprise first ring bodies, and the first ring bodies are provided with circular truncated cone ring bodies coaxial with the first ring bodies. The first ring body is the same as the inner circle diameter of the circular truncated cone ring body, the small opening end of the circular truncated cone ring body is connected with the first ring body, and the large opening end of the circular truncated cone ring body is in surface contact with the annular end face of the corrugated pipe. The utility model discloses a bellows subassembly welded structure has the advantage that the welding seam dependable performance, antifatigue, longe-lived.

Description

Be applied to bellows subassembly welded structure of bellows stop valve

Technical Field

The utility model belongs to the technical field of the stop valve, concretely relates to be applied to bellows assembly welded structure of bellows stop valve, the utility model discloses a bellows assembly welded structure mainly is applied to through bellows stop valve.

Background

The stop valve of the corrugated pipe is also called as a sealing stop valve of the corrugated pipe, and is a stop valve which forms a barrier between a fluid medium and the atmosphere by automatic fusion welding and ensures zero leakage of a valve rod. The corrugated pipe stop valve is mainly applied to pipelines with higher sealing requirements, and is particularly suitable for medium pipelines with steam, toxicity, harm, radioactivity, flammability, explosiveness and the like.

The corrugated pipe assembly in the corrugated pipe stop valve mainly plays a role in sealing and isolating and belongs to a non-filler sealing and isolating element. During the operation of the stop valve, the bellows and the flap are displaced axially and reset together, while they are also subjected to the pressure of the fluid and ensure sealing.

In practice, the bellows is often welded to other components, such as a valve stem in a bellows shut-off valve. In order to prevent the medium leakage, the sealing performance of the welding seam is extremely high. The conventional brazing and rolling welding technology has the defects of low welding seam strength after welding, easy generation of welding leakage, insufficient welding, no welding, damage to the corrugated pipe and the like, has the risk of leakage, and causes the problems of low qualification rate and no quality guarantee of the corrugated pipe stop valve.

In view of the above, there is a need for an improved welding structure and welding method for a bellows assembly in the prior art.

Disclosure of Invention

An object of the utility model is to provide a be applied to bellows assembly welded structure of bellows stop valve, it can guarantee the welding compactness between bellows and valve rod, the valve gap ring effectively, avoids the welded junction to appear leaking the condition of welding, rosin joint, damage when using, has improved bellows assembly life effectively, reduces bellows stop valve's cost of overhaul.

Realize the utility model discloses the technical scheme of purpose as follows: the utility model provides a be applied to bellows subassembly welded structure of bellows stop valve, bellows subassembly welded structure cover is established on the valve rod, includes first valve gap ring, bellows, the second valve gap ring that sets gradually from bottom to top, and first valve gap ring is located the valve rod, and bellows and second valve gap ring can be dismantled the cover and establish on the valve rod. The two ends of the corrugated pipe extend along the length direction of the corrugated pipe to form a straight pipe section, the pipe opening of the straight pipe section is provided with annular end faces, and the annular end faces at the two ends of the corrugated pipe are in contact with and attached to the lower surface of the second valve cover ring or the upper surface of the first valve cover ring.

The first valve cover ring and the second valve cover ring both comprise first ring bodies, and the first ring bodies are provided with circular truncated cone ring bodies coaxial with the first ring bodies. The first ring body is the same as the inner circle diameter of the circular truncated cone ring body, the small opening end of the circular truncated cone ring body is connected with the first ring body, and the large opening end of the circular truncated cone ring body is in surface contact with the annular end face of the corrugated pipe.

The utility model discloses a bellows subassembly to bellows stop valve designs, through the straight tube section of bellows tip and the design of cyclic annular terminal surface for form the face contact between first valve cap ring or second valve cap ring and the bellows, simultaneously through the design of round platform ring body on first valve cap ring and the second valve cap ring, prevent the situation of leaking the welding, thereby greatly improve bellows subassembly's sealing performance and life.

In this case, it should be noted that the circular truncated cone refers to a plane parallel to the bottom surface of the circular cone, and the portion between the bottom surface and the cross section is called the circular truncated cone. A truncated cone is also considered to be the portion of a cone that is sectioned by two perpendicular planes to its axis, and may therefore also be referred to as a "truncated cone". The circular truncated cone is a right circular truncated cone, and unless otherwise noted, the circular truncated cone refers to a right circular truncated cone, and a circular truncated cone ring body is formed by arranging a through hole for a valve rod to pass through at the center of the circular truncated cone.

Further, in order to prevent the bellows subassembly during operation of bellows stop valve, the welding seam of circular truncated cone ring body and cyclic annular terminal surface contact department is touched by accident to influence the leakproofness of bellows subassembly welding seam department of bellows stop valve, make the excircle diameter of the macrostoma end of circular truncated cone ring body be less than the excircle diameter of first ring body, thereby with the welding seam restriction in the virtual barrel region that forms between the first ring body of first valve cover ring and the first ring body of second valve cover ring.

Furthermore, when the corrugated pipe assembly is welded, the contact part of the corrugated pipe and the first valve cover ring and the contact part of the corrugated pipe and the second valve cover ring are welded, and in order to increase the contact part and the contact area between the welding seam and the corrugated pipe, the first valve cover ring and the second valve cover ring, the excircle diameter of the large opening end of the circular truncated cone ring body is larger than that of the annular end face. When the excircle diameter of the large opening end of the circular truncated cone ring body is larger than the excircle diameter of the annular end face of the corrugated pipe, 3 positions are arranged at the contact positions of the corrugated pipe and the first valve cover ring and the corrugated pipe and the second valve cover ring during welding. At the moment, the welding seams of the corrugated pipe, the first valve cover ring and the second valve cover ring are located in the middle, the thickness of the welding seam located in the middle is the largest during welding, the strength of the welding seam can be guaranteed, and the problems of welding leakage, non-welding and welding seam damage during working are prevented.

Furthermore, the corrugated pipe is a metal corrugated pipe containing 0.05-0.15% of carbon element, and the metal corrugated pipe containing the carbon element has the characteristics of high tensile strength and high deformation resistance, and has high corrosion resistance, so that the service life of the corrugated pipe assembly can be prolonged. The carbon element can improve the tensile strength of the metal corrugated pipe, and when the carbon content of the metal corrugated pipe is more than 0.2%, the welding performance of the corrugated pipe is deteriorated. Therefore, the utility model discloses the carbon element content who selects metal bellows is 0.05~ 0.15%.

As right the utility model discloses a further improvement, for further improve the contact surface of welding seam on bellows and first valve bonnet ring or second valve bonnet ring, still be equipped with the second ring body between first ring body and round platform ring body, the excircle diameter of second ring body is the same with the excircle diameter of the osculum end of round platform ring body. Simultaneously, the setting of second ring body can improve the intensity of first valve cap ring sum second valve cap ring, avoids bellows stop valve during operation, and first valve cap ring sum second valve cap ring damages because of the effort is too big.

Compared with the prior art, the beneficial effects of the utility model are that: by newly designing the welding structure of the corrugated pipe assembly, the welding quality of the corrugated pipe assembly is improved. When the fusion welding method is adopted for welding, the welding seam can be stably welded with the corrugated pipe assembly, so that the pressure resistance, the temperature resistance and the fatigue resistance of the welding seam are ensured, and the reliability of the welding seam is improved.

Drawings

Fig. 1 is a schematic structural view of a welding structure of a bellows assembly according to the present invention;

FIG. 2 is a schematic view of a bellows of the bellows assembly welding structure of the present invention;

fig. 3 is a schematic structural view of a first valve cover ring and a second valve cover ring in the welding structure of the bellows assembly of the present invention;

fig. 4 is an enlarged view of a portion a in embodiment 1 of the present invention;

fig. 5 is an enlarged view of a portion b in embodiment 1 of the present invention;

fig. 6 is another schematic structural view of the first and second cover rings in the welded structure of the bellows assembly of the present invention;

fig. 7 is another schematic structural view of the bellows assembly welding structure of the present invention;

fig. 8 is an enlarged effect diagram after welding the part a in embodiment 1 of the present invention;

fig. 9 is an enlarged effect diagram of the embodiment 1 of the present invention after welding the b portion;

wherein, 1, the valve rod; 2. a first bonnet ring; 3. a bellows; 4. a second bonnet ring; 5. a valve flap cover; 6. a valve flap; 7. opening the ring; 8. a first ring body; 9. a circular truncated cone ring body; 10. a second ring body; 31. a straight pipe section; 32. an annular end face.

Detailed Description

The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that the functions, methods, or structural equivalents or substitutions made by these embodiments are within the scope of the present invention.

In the description of the present embodiments, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to a number of indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.

The terms "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.

Example 1:

this embodiment provides a be applied to bellows subassembly welded structure of bellows stop valve, as shown in fig. 1, in this embodiment, bellows subassembly welded structure cover is established on valve rod 1, includes first valve bonnet ring 2, bellows 3, the second valve bonnet ring 4 that sets gradually from bottom to top, and first valve bonnet ring 2 is located valve rod 1, and bellows 3 and the cover can be dismantled to second valve bonnet ring 4 and establish on valve rod 1. The valve rod 1 at the lower end of the first valve cover ring 2 is sleeved with a valve clack cover 5, the lower end of the valve rod 1 is provided with a valve clack 6, and the lower ends of the valve clack 6 and the valve clack cover 5 are provided with a split ring 7.

As shown in fig. 2, the two ends of the corrugated tube 3 extend along the length direction of the corrugated tube 3 to form straight tube sections 31, the pipe openings of the straight tube sections 31 are provided with annular end surfaces 32, and the annular end surfaces 32 at the two ends of the corrugated tube 3 are in surface contact with and closely attached to the lower surface of the second valve cover ring 4 or the upper surface of the first valve cover ring 2. The corrugated tube 3 is a metal corrugated tube containing 0.05-0.15% of carbon, in this embodiment, the metal corrugated tube is preferably a nickel-based alloy corrugated tube containing 0.08-0.12% of carbon, such as hastelloy C-276, the thickness of the corrugated tube 3 is 0.2mm, and meanwhile, in order to further improve the quality of the metal corrugated tube, the metal corrugated tube may further contain elements such as silicon, manganese, nickel, and the like, so as to limit the content of elements such as sulfur, phosphorus, and the like, which are unfavorable for welding. In the present embodiment, the length of the straight tube section 31 of the corrugated tube 3 is 1.0 to 3.0mm, and the diameter difference between the outer circle and the inner circle of the annular end surface 32 is 0.03 to 0.05mm, that is, the roundness tolerance of the annular end surface 32 is 0.03 to 0.05 mm.

As shown in fig. 3, the first valve cover ring 2 and the second valve cover ring 4 both include a first ring body 8, and a circular truncated cone ring body 9 coaxial with the first ring body 8 is disposed on the first ring body 8. The diameter of the inner circle of the first ring body 8 is the same as that of the inner circle of the circular truncated cone ring body 9 (the diameter of the inner circle of the annular end face 32 of the corrugated pipe is the same), the small opening end of the circular truncated cone ring body 9 is connected with the first ring body 8, and the large opening end of the circular truncated cone ring body 9 is in surface contact with the annular end face 32 of the corrugated pipe 3.

In this embodiment, in order to prevent the bellows assembly of the bellows stop valve from moving, the weld seam at the contact position of the circular truncated cone ring body 9 and the annular end surface 32 falls off, which affects the sealing performance of the bellows stop valve, so that the outer diameter of the large opening end of the circular truncated cone ring body 9 is smaller than the outer diameter of the first ring body 8, and the weld seam is limited in the virtual cylinder area formed between the first ring body 8 of the first valve cover ring 2 and the first ring body 8 of the second valve cover ring 4. Specifically, the thickness of the first ring body 8 is 5mm, the thickness of the circular truncated cone ring body 9 (namely, the vertical distance from the large opening end to the small opening end) is 2mm, and the excircle radius of the first ring body 8 is 50mm larger than that of the circular truncated cone ring body 9.

When the corrugated pipe assembly is welded, the contact parts of the corrugated pipe 3 and the first valve cover ring 2 and the second valve cover ring 4 are welded, so that the contact area of the welding seam and the contact parts among the corrugated pipe 3, the first valve cover ring 2 and the second valve cover ring 4 is increased. In this embodiment, the outer diameter of the large opening end of the circular truncated cone ring body 9 is larger than the outer diameter of the annular end face 32, and when the outer diameter of the large opening end of the circular truncated cone ring body 9 is larger than the outer diameter of the annular end face 32 of the bellows 3, there are 3 positions of the weld seam at the contact positions between the bellows 3 and the first valve cover ring 2, between the bellows 3 and the second valve cover ring 4 during welding, such as the contact surfaces a1, a2, a3 in fig. 4 and the contact surfaces b1, b2, b3 in fig. 5. At the moment, the welding seams of the corrugated pipe 3, the first valve cover ring 2 and the corrugated pipe 3, which are in contact with the second valve cover ring 4, are positioned in the middle, the thickness of the welding seams is the largest, the strength of the welding seams can be ensured, and the problems of welding leakage, non-welding and damage of the welding seams during action are prevented.

The principle of the welded structure of the bellows assembly of the present embodiment is: a straight pipe section 31 and an annular end surface 32 are designed at the end part of the corrugated pipe 3, so that surface contact is formed between the first valve cover ring 2 or the second valve cover ring 4 and the corrugated pipe; meanwhile, due to the design of the circular truncated cone ring body 9 on the first valve cover ring 2 and the second valve cover ring 4, the situation of welding leakage is prevented, and therefore the sealing performance and the service life of the corrugated pipe assembly are greatly improved.

Example 2:

as a further improvement to the above embodiment 1, in order to further increase the contact surface of the weld on the bellows 3 and the first or second cover ring 2, 4, as shown in fig. 6 and 7, a second ring 10 is further provided between the first ring 8 and the circular truncated cone ring 9, and the outer diameter of the second ring 10 is the same as the outer diameter of the small-opening end of the circular truncated cone ring 9. In this case, the second ring 10 can increase the strength of the first cover ring 2 and the second cover ring 4, and prevent the first cover ring 2 and the second cover ring 4 from being damaged by excessive force when the bellows stop valve operates. In this embodiment, the second ring body 10 is 2mm in length.

The following welding methods were used to weld the welded structures of the bellows assemblies of examples 1 and 2, and the effects after welding are shown in fig. 8 and 9, and the welding methods of the bellows assemblies were as follows:

firstly, preparing work, wherein before welding, an internal pressure test is firstly carried out on the corrugated pipe 3 by using 7MPa nitrogen to ensure the sealing property of the corrugated pipe 3; secondly, checking parts such as the first valve cover ring 2, the second valve cover ring 4, the valve clack cover 5, the valve clack 6, the split ring 7 and the like to ensure that the parts are not damaged; and scrubbing all parts by using alcohol again.

And step two, sleeving the corrugated pipe 3 on the valve rod 1, and enabling the annular end face 32 at the lower end of the corrugated pipe 3 to be tightly attached to the end face of the small opening end of the circular truncated cone ring body 9 of the first valve cover ring 2.

And step three, sleeving the second valve cover ring 4 on the valve rod 1, and enabling the annular end surface 32 at the upper end of the corrugated pipe 3 to be tightly attached to the end surface of the small opening end of the circular truncated cone ring body 9 of the second valve cover ring 4.

And fourthly, clamping the corrugated pipe assembly on the pulse micro-plasma arc welding equipment, rotating the corrugated pipe assembly arranged on the plasma arc welding equipment for a circle after aligning the welding gun, and observing whether the height and the left-right deviation of the welding gun meet the requirements or not, if not, adjusting the welding gun.

And step five, welding the corrugated pipe 3 with the first valve cover ring 2 at the lower end of the corrugated pipe, welding the corrugated pipe 3 with the second valve cover ring 4 at the upper end of the corrugated pipe, immediately coating the corrugated pipe with heat insulation cotton after welding, and slowly cooling the corrugated pipe.

And step six, adopting 7MPa nitrogen to carry out pressure test on the corrugated pipe assembly, and judging whether the welding seam is leaked.

The above list of details is only for the practical implementation of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the technical spirit of the present invention should be included in the scope of the present invention.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (5)

1. A corrugated pipe assembly welding structure applied to a corrugated pipe stop valve is sleeved on a valve rod and comprises a first valve cover ring, a corrugated pipe and a second valve cover ring which are sequentially arranged from bottom to top, wherein the first valve cover ring is positioned on the valve rod, and the corrugated pipe and the second valve cover ring are detachably sleeved on the valve rod; the method is characterized in that: two ends of the corrugated pipe extend along the length direction of the corrugated pipe to form a straight pipe section, an annular end face is arranged on a pipe orifice of the straight pipe section, and the annular end faces at the two ends of the corrugated pipe are in surface contact with and tightly attached to the lower surface of the second valve cover ring or the upper surface of the first valve cover ring;

the first valve cover ring and the second valve cover ring respectively comprise a first ring body, and a circular truncated cone ring body coaxial with the first ring body is arranged on the first ring body; the first ring body is the same as the inner circle diameter of the circular truncated cone ring body, the small-opening end of the circular truncated cone ring body is connected with the first ring body, and the large-opening end of the circular truncated cone ring body is in surface contact with the annular end face of the corrugated pipe.

2. A bellows assembly welding structure applied to a bellows stop valve according to claim 1, wherein: the excircle diameter of the large opening end of the circular truncated cone ring body is smaller than that of the first ring body.

3. A bellows assembly welding structure applied to a bellows stop valve according to claim 1, wherein: the excircle diameter of the large opening end of the circular truncated cone ring body is larger than that of the annular end face.

4. A bellows assembly welding structure applied to a bellows stop valve according to claim 1, wherein: the corrugated pipe is a metal corrugated pipe containing 0.05-0.15% of carbon element.

5. A bellows assembly welded structure for a bellows stop valve according to any one of claims 1 to 4, wherein: the first ring body with still be equipped with the second ring body between the round platform ring body, the excircle diameter of second ring body with the excircle diameter of the osculum end of round platform ring body is the same.

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