CN214403683U - Medium-pressure main throttle valve of steam turbine - Google Patents

Abstract

The utility model discloses a steam turbine middling pressure main throttle valve belongs to the steam turbine technology field, according to the characteristics of valve dynamic seal structure, on the basis of keeping original seal structure unchangeable, through add the sealed form of packing box in the outer end of steam turbine middling pressure main throttle valve spherical seal ring, promote the valve seal effect, including valve shaft, support end cover, the valve body, the outside end cover, make up the retaining ring, the gland, gland and packing bottom ring, support end cover connection valve body, valve shaft passes valve body and support end cover, be equipped with the bearing between valve shaft and the support end cover, the bearing outside cover is still overlapped and is equipped with the axle sleeve, the valve shaft cover of support end cover's outer end department establishes the gland ring, still be equipped with gland between the outer terminal surface of valve shaft and support end cover, have the clearance that is used for packing between gland and the gland ring; the edge of the support end cover protrudes outwards to form a box body, the outer end face of the box body is detachably connected with the outer end cover, and the valve shaft penetrates through the outer end cover.

Description

Medium-pressure main throttle valve of steam turbine

Technical Field

The utility model belongs to the technical field of the steam turbine, concretely relates to steam turbine middling pressure main throttle.

Background

The statements herein merely provide background related to the present disclosure and may not necessarily constitute prior art.

In recent years, remarkable achievement is achieved in the valve sealing industry, and the valve sealing technology is greatly improved. However, the existing valve sealing technology still has defects, so that the medium-pressure main valve sealing technology level of the steam turbine falls behind far, the normal efficiency of the steam turbine cannot be exerted in production, and huge economic loss and potential safety hazards are caused.

The inventor thinks that, among the main steam valve sealing technique of current steam turbine middling pressure, generally use metal ball-type sealing washer to carry out single sealed at the valve axle head, sealed effect is poor, along with the increase of equipment operation year, this type valve axle head has the leakage of different degrees.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a steam turbine middling pressure main valve, according to the characteristics of valve dynamic seal structure, on the unchangeable basis of original seal structure of remaining, add the flexible sealed form of filler combination through the outer end at steam turbine middling pressure main valve metal sphere seal ring, promote the valve seal effect.

In order to achieve the above purpose, the present invention is realized by the following technical solution:

the technical scheme of the utility model provides a steam turbine middling pressure main throttle, a serial communication port, including valve shaft, support end cover, valve body, outside end cover, combination retaining ring, gland and filler bottom ring, the support end cover is connected the valve body, the valve shaft passes valve body and support end cover, be equipped with the bearing between valve shaft and the support end cover, the bearing outside cover is still overlapped and is equipped with the axle sleeve, the valve axle sleeve of support end cover's outer end department establishes the gland bottom ring, still be equipped with gland between valve shaft and the support end cover outer end face, have the clearance that is used for packing between gland and the gland; the edge of the support end cover protrudes outwards to form a box body, the outer end face of the box body is detachably connected with the outer end cover, and the valve shaft penetrates through the outer end cover.

When the utility model is used, the utility model is required to be installed on a steam turbine, and when the tightness of seasoning is required to be adjusted, a spanner is directly inserted into the box body through the upper hole of the outer side end cover, and the flange pressing bolt is aligned and adjusted; when the filler needs to be replaced, the outer end cover is detached, and the internal filler area can be directly operated.

Above-mentioned the utility model discloses a technical scheme's beneficial effect as follows:

1) the utility model discloses in, when needing to change the filler, lift off the end cover of the outside and can directly operate the packing region of inside, the outside end cover that dismantlement formula is connected when having guaranteed that the wind effect is admired to a certain degree, also is convenient for maintain inside filler, has further improved the leakproofness of whole throttle.

2) The utility model discloses in, use the spanner can directly cover the hole through the outside and insert in the box body, aim at and adjust the flange pressing bolt to the compaction elasticity that the adjustment elasticity was packed.

3) Steam turbine middling pressure main throttle adopts the utility model provides a behind this kind of sealed mode, to guarantee safety in production, energy saving and consumption reduction, improve steam turbine efficiency and production technology level etc. and have important meaning.

4) The utility model discloses in, redesign the installation position of the big arm of manipulation seat into modular structure, remove the outside chamber wall of support end cover, use the outside end cover to replace the outside chamber wall that removes, will install on newly adding the end cover outside the axle sleeve, such structure can make things convenient for the assembly of valve axle and rocking arm, easy dismounting when valve overhauls and inspects.

Drawings

The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention.

Fig. 1 is a schematic cross-sectional view of the present invention according to one or more embodiments.

In the figure: 1. the device comprises an outer side end cover, 2, a flange bolt, 3, a combined retainer ring, 4, a packing gland, 5, sealing packing, 6, a packing bottom ring, 7, a support end cover, 8, a bolt for connecting the support end cover and a valve body, 9, the valve body, 10, a bolt for connecting the outer side end cover and a box body, 11, a valve shaft, 12, a bearing, 13 and a shaft sleeve.

The spacing or dimensions between each other are exaggerated to show the location of the various parts, and the illustration is for illustrative purposes only.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, unless the invention expressly state otherwise, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;

for convenience of description, the words "upper", "lower", "left" and "right" in the present invention, if any, merely indicate that the directions of movement of the device or element are consistent with those of the drawings, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.

Term interpretation section: the terms "mounted," "connected," "fixed," and the like in the present invention are to be understood in a broad sense, for example, they may be fixedly connected, detachably connected, or integrated; the two components can be connected mechanically or electrically, directly or indirectly through an intermediate medium, or connected internally or in an interaction relationship, and specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Just as the background art introduces, the utility model discloses a according to the characteristics of valve dynamic seal structure, on keeping the unchangeable basis of former seal structure, add the sealed form of stuffing box through the outer end at steam turbine middling pressure main valve spherical seal ring, promote the valve seal effect.

Example 1

The utility model discloses a typical embodiment, this embodiment discloses a steam turbine middling pressure main throttle, including valve shaft 11, support end cover 7, valve body 9, outside end cover 1, combination retaining ring 3, gland 4, seal 5 and packing bottom ring 6, support end cover 7 connects valve body 9, valve shaft 11 passes valve body 9 and support end cover 7, be equipped with the bearing between valve shaft 11 and the support end cover 7, the bearing outside cover still is equipped with axle sleeve 13, valve shaft 11 cover at the outside end of support end cover 7 establishes packing bottom ring 6, still be equipped with gland 4 between valve shaft 11 and the outer end face of support end cover 7, have the clearance that is used for filling the packing between packing bottom ring 6 and the gland 4; the edge of the bracket end cover 7 protrudes outwards to form a box body, the outer end face of the box body is detachably connected with the outer end cover 1, and the valve shaft 11 penetrates through the outer end cover 1.

It should be noted here that the sealing device in this embodiment is applied to a turbine medium-pressure main valve, in this embodiment, a description needs to be given to the turbine medium-pressure main valve, the turbine medium-pressure main valve includes a valve shaft 11, a bracket end cover 7 and a valve body 9, the bracket end cover 7 is provided with a step-shaped portion, the valve body 9 is sleeved on the step-shaped portion of the bracket end cover 7, and a large end of the bracket end cover 7 is screwed with the valve body 9 through an inner screw; valve shaft 11 passes valve body 9 and support end cover 7, is equipped with the bearing between valve body 9 and the valve shaft 11, is equipped with axle sleeve 13 between bearing and the valve body 9, in this embodiment, installs the end cover device in the valve body 9 outside, remains the filler that sets up between valve and valve shaft 11 simultaneously.

Specifically, referring to fig. 1, the inner side of the valve stem retains the originally designed spherical hard sealing structure between the metal spherical sealing ring and the valve stem shoulder and the shaft sleeve 13.

It can be understood that, in the prior art, the edge of the bracket end cover 7 protrudes outward to form an outer side cavity wall, the outer side cavity wall is removed in this embodiment to form a box body, an outer side end cover 1 is newly added at the original outer side cavity wall position to replace the removed outer side cavity wall, the outermost side shaft sleeve 13 is installed on the outer side end cover 1, and the valve shaft 11 passes through the outermost side shaft sleeve 13, so that the structure can facilitate the assembly of the valve rod and the rocker arm, and the valve is convenient to disassemble and assemble during maintenance and inspection.

Further, a valve shaft 11 in the box body is sleeved with a combined retainer ring 3 for sealing the valve shaft 11 and the connecting piece. The combined retainer ring 3 comprises an annular sleeve and two semicircular parts, the two semicircular parts are sleeved on the valve shaft 11, and the annular sleeve is sleeved on the two semicircular parts.

Further, the two semi-annular members are located on the same cross section of the valve shaft 11.

Furthermore, a packing bottom ring 6 is arranged beside the shaft sleeve 13, a packing gland 4 is arranged between the outer side end of the valve body 9 and the valve shaft 11, and a space between the packing gland 4 and the packing bottom ring 6 is used for adding packing.

Further, the packing gland 4 in this embodiment includes a cylindrical portion and an annular portion, the inner edge of the annular portion is connected to the cylindrical portion, the cylindrical portion is inserted into the gap between the valve shaft 11 and the shaft hole of the bracket end cover, and the annular portion is fixedly connected to the valve body 9 through a compressed nut.

Furthermore, a graphite packing ring assembly and a packing pressing sleeve which are resistant to high temperature and high pressure are arranged in the space between the packing pressing cover 4 and the packing bottom ring 6, and the outer end of the packing pressing plate presses packing to form effective sealing.

Further, the outside end cap 1 is provided with a through hole. The support end cover 7 is connected with the valve body 9 through a compression bolt 8, and a hole in the outer end cover 1 is coaxial with the corresponding flange pressing bolt 2.

It will be appreciated that the outboard end cap 1 is circular, and the apertures in the outboard end cap 1 in this embodiment are arranged in an annular array along the valve axis, as are the platen bolts 2.

Furthermore, in order to facilitate the hot supplement and compression of the axial sealing packing 5, the countersunk head of the flange pressing bolt 2 for connecting the support end cover 7 and the valve body 9 is arranged on the outer end face of the support end cover 7, and a through hole is formed in the corresponding position of the outer end cover 1, so that the flange pressing bolt 2 can be conveniently screwed down by a wrench through the through hole, and the packing compression force can be adjusted.

Furthermore, a combined retainer ring 3 for the shaft formed by matching two semi-rings with a ring sleeve is arranged on the valve shaft 11.

Furthermore, the shaft sleeve 13 in this embodiment is also provided with a step-shaped portion, in this embodiment, the step-shaped portion provided on the shaft sleeve 13 is named as a step-shaped portion of the shaft sleeve 13, an outer cylindrical surface of the step-shaped portion of the shaft sleeve 13 is attached to an inner cylindrical surface of the small end of the bracket end cover 7, the large end of the shaft sleeve 13 is provided with a spherical washer mounting position, and the spherical washer is mounted on the spherical washer mounting position.

It can be understood that a plurality of threaded holes screwed with the packing screws are uniformly distributed on the large end face of the bracket end cover 7.

Furthermore, step-shaped protrusions are arranged on the inner side of the shaft hole of the support end cover 7, and the packing bottom ring 6 is arranged at the step-shaped protrusions.

In practice, the apparatus disclosed in this embodiment is installed in the medium pressure main valve of a steam turbine.

The packing, the packing gland 4 and the packing bottom ring 6 can form effective isolation, and the packing bottom ring 6 can prevent the disordered steam flow in the valve from washing away the sealing packing 5, so that the reliability of the sealing device is greatly improved, and the service life of the sealing device is greatly prolonged.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A medium-pressure main throttle valve of a steam turbine is characterized by comprising a valve shaft, a support end cover, a valve body, an outer end cover, a packing gland, sealing packing and a packing bottom ring, wherein the support end cover is connected with the valve body; the edge of the support end cover protrudes outwards to form a box body, the outer end face of the box body is detachably connected with the outer end cover, and the valve shaft penetrates through the outer end cover.

2. A medium pressure main valve in a steam turbine according to claim 1, wherein a valve sleeve located in said casing is provided with a combined retainer ring for sealing the valve shaft and the connecting member.

3. The turbine intermediate pressure main valve of claim 2, wherein said combined retainer includes an annular collar and two semi-annular members, the two semi-annular members being disposed about the valve shaft and the annular collar being disposed about the two semi-annular members.

4. A turbine intermediate pressure main valve according to claim 3, wherein both said semi-rings are located on the same cross section of said valve shaft.

5. The main medium pressure steam turbine main throttle of claim 1, wherein the packing gland includes a cylindrical portion and an annular portion, the inner edge of the annular portion is connected to the cylindrical portion, the cylindrical portion is inserted into the gap between the valve shaft and the shaft hole of the bracket cover, and the annular portion is fixedly connected to the valve body.

6. The steam turbine intermediate pressure main valve of claim 1, wherein said outboard end cap is provided with a bore therethrough.

7. The steam turbine intermediate pressure main valve of claim 6, wherein the bracket end cap is attached to the valve body by a clamp bolt, and the bore in the outboard end cap is coaxial with the corresponding clamp bolt.

8. The main medium pressure steam turbine main throttle valve according to claim 1, wherein the bracket end cover is provided with a step-like projection inside the shaft hole, and the packing bottom ring is provided at the step-like projection.

9. The main medium pressure steam turbine main throttle of claim 1, wherein the bracket cover is provided with a step-like projection on the outside, and the valve body is fitted over the step-like projection of the bracket cover.

10. The turbine intermediate pressure main valve of claim 1, wherein the outboard end cap and the casing are bolted together.

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