CN211258732U - Sealed casing and steam turbine - Google Patents

Abstract

The application discloses a sealed casing and a steam turbine, wherein the casing is assembled in a mode of being sequentially overlapped from bottom to bottom, and a cavity for accommodating the steam turbine is constructed by matching a flexible rubber ring under the action of gravity to complete good sealing, so that the effect of improving the sealing property of the casing is achieved, and the problem that the traditional axial installation mode is difficult to fasten is solved; lower casing, go up casing and top casing three's two butt joints department and seted up annular groove and card foot, through blocking the foot card in the draw-in groove, realize its horizontal direction spacing, the gravity of cooperation itself can realize spacing of vertical direction, thereby will push up the casing and firmly fix on last casing, will go up the casing and firmly fix under on the casing, and, can realize the cooperation that compresses tightly of three casing under the effect of gravity, the sealing washer of deuterogamy gap department makes the cavity in the casing keep apart with external, improve the leakproofness of whole cavity.

Description

Sealed casing and steam turbine

Technical Field

The application relates to the field of steam turbines, in particular to a sealed casing and a steam turbine.

Background

The steam turbine is an external combustion rotary machine capable of converting steam heat energy into mechanical work; after steam from a boiler enters a steam turbine, the steam passes through a series of annularly arranged nozzles and movable blades in sequence, and heat energy of the steam is converted into mechanical energy for rotating a rotor of the steam turbine. The steam is converted in different ways in the steam turbine, thus forming the steam turbine with different working principles.

The inventor finds that the volume of a casing for protecting a main shaft and blades of a steam turbine is large due to the large volume of the main shaft and the blades, and the casing is usually installed in an axial multi-section splicing mode, but when fastening force is applied in the axial direction, the multi-section splicing structure has a plurality of gaps in sequence, the positions of the gaps are difficult to seal well, and the steam turbine casing leaks air to generate energy loss; the shell is in a high-temperature steam atmosphere for a long time, and the inside of the shell is easy to generate rust under a humid environment and at a high temperature, so that the shell structure generates weak points; when the shell is assembled again, the mode that the shell is directly bound by the steel wire rope is mostly adopted, so that the binding and the dismounting are difficult, the steel wire rope can also abrade the matching surface of the shell, and the problem of untight matching is caused.

SUMMERY OF THE UTILITY MODEL

The purpose of this application is to the defect that prior art exists, provides a sealed casing and steam turbine, assembles the casing through adopting from the mode that stacks in proper order down, thereby accomplishes the cavity that good sealed the construction held the steam turbine through the flexible rubber circle of action of gravity cooperation, reaches the effect that improves the casing leakproofness, has solved traditional axial mounting means and has been difficult to carry out the problem fastened.

The first purpose of this application is to provide a sealed casing, adopts following technical scheme:

including lower casing, last casing and the top casing that from the bottom up connected gradually, the cavity is formed jointly to the three, the cavity is used for holding the main shaft and the blade of steam turbine, be equipped with first recess on the top surface of casing down, be equipped with first card foot on the bottom surface of going up the casing, first card foot is used for realizing being connected of casing and lower casing with first recess block, be equipped with the second recess on the top surface of going up the casing, be equipped with second card foot on the bottom surface of top casing, second card foot and second recess block are used for realizing being connected of top casing and lower casing, first recess and second recess are the annular, and its opening both sides all are equipped with the rubber circle, the rubber circle is sealed the cavity under the pressure of last casing and top casing.

Furthermore, the lower shell comprises a lower cavity with an open top, the upper shell comprises a channel with a top surface and an open bottom, the open bottom of the channel is communicated with the lower cavity, the top shell is matched with the upper shell to block the open top of the channel, the open top of the lower shell is positioned inside the inner ring of the annular first groove, and the open top of the upper shell is positioned inside the inner ring of the annular second groove, so that the cavity is sealed.

Furthermore, the upper shell is provided with a hanging ring for the external hanging lifting device to drive the upper shell to move, and the outer surface of the upper shell and the channel are both provided with the hanging ring.

Furthermore, the top shell is provided with at least two hooks, and the hooks are used for being externally connected with a lifting device to drive the top shell to move.

Furthermore, the side wall of the lower shell is provided with heat dissipation holes, and the heat dissipation holes are used for heat exchange between the cavity and the outside of the sealed machine shell so as to reduce the temperature in the cavity.

Furthermore, the inner wall of the cavity is pasted with a damp-proof plate for reducing the humidity in the shell.

Furthermore, a cooling device is further arranged in the lower shell and comprises a circulating pipeline, a refrigerant medium, a circulating pump and a refrigerator, the circulating pump and the refrigerator are connected into the circulating pipeline, the refrigerant medium flows in the circulating pipeline, and the cooling device is used for absorbing heat in the cavity and discharging the heat out of the sealed shell through the refrigerator.

Furthermore, the circulating pipeline is arranged in the side wall of the lower shell and passes through the heat dissipation hole, and is used for absorbing heat in the heat dissipation hole and discharging the heat out of the sealed shell through the refrigerator.

The second purpose of this application is to provide a steam turbine, adopts following technical scheme.

The steam turbine comprises the sealed casing, the main shaft and the blades matched on the main shaft, wherein the main shaft is installed between the lower shell and the upper shell through a bearing, and the blades matched on the main shaft are positioned in the cavity.

Compared with the prior art, the application has the advantages and positive effects that:

(1) the annular groove and the clamping pin are arranged at the two butt joints of the lower shell, the upper shell and the top shell, the clamping pin is clamped in the clamping groove to realize the limit of the clamping pin in the horizontal direction, the limit of the clamping pin in the vertical direction can be realized by matching the gravity of the clamping pin, so that the top shell is firmly fixed on the upper shell, the upper shell is firmly fixed on the lower shell, the three shells can be in compression fit under the action of the gravity, and the sealing ring at the gap is matched to isolate the cavity in the shell from the outside, so that the sealing property of the whole cavity is improved;

(2) the cooling device is arranged in the casing, so that the steam turbine can be cooled during use, the temperature of the steam turbine is reduced, the aging of the casing caused by long-term heating is avoided, the temperature is reduced, the humidity in the cavity is reduced by matching with the moisture-proof plate, the environment where the fan blades and the inner wall material of the cavity are located can be effectively improved, the fan blades and the inner wall material of the cavity are in a low-temperature drying state, the corrosion probability of the fan blades is reduced, the maintenance frequency is reduced, and the generation of weak points can be effectively reduced;

(3) the hook is arranged on the outer wall of the shell, so that a user can conveniently lift the upper shell and the shell top during installation and splicing, the traditional steel wire rope binding and lifting mode is avoided, and the problem of inaccurate matching caused by the damage of an interface by the steel wire rope can be effectively avoided;

(4) the heat that the steam turbine produced can be in the radiating hole department and the cooling tube contact, and the cooling tube temperature is lower, and the hot-air of neutralization increases the area of contact of cooling tube and high temperature environment, increases the radiating rate of steam turbine, and the temperature is cooled down once more in the cooling box after the temperature risees, and the repeated cooling.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.

Fig. 1 is a schematic view of an overall structure of a steam turbine according to embodiment 1 of the present application;

fig. 2 is a schematic structural view of a lower case according to embodiment 1 of the present application;

fig. 3 is a schematic view illustrating the engagement between the groove and the clip in embodiment 1 of the present application.

Wherein: 1. lower casing, 2, cooling tube, 3, dampproofing board, 4, bearing, 5, main shaft, 6, blade, 7, last casing, 8, rings, 9, card foot, 10, rubber circle, 11, top casing, 12, couple, 13, refrigerator, 14, circulating pump, 15, louvre.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. 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 application 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 according to the present application. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, 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 "up", "down", "left" and "right" in this application, if any, merely indicate correspondence with the directions of up, down, left and right of the drawings themselves, and do not limit the structure, but merely facilitate the description of the application and simplify the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.

The terms "mounted", "connected", "fixed", and the like in the present application should be understood broadly, and for example, the terms "mounted", "connected", and "fixed" 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 application will be understood by those skilled in the art according to specific situations.

As described in the background art, the main shaft and the blades of the steam turbine in the prior art have large volumes, so that the casing for protecting the steam turbine has a large volume, and the steam turbine is usually installed by axial multi-section splicing, but when fastening force is applied from the axial direction, the multi-section splicing structure has a plurality of gaps in sequence, and the positions of the gaps are difficult to be well sealed, so that the steam turbine casing leaks air to generate energy loss; the shell is in a high-temperature steam atmosphere for a long time, and the inside of the shell is easy to generate rust under a humid environment and at a high temperature, so that the shell structure generates weak points; the casing adopts the mode that wire rope directly tied up the casing and constitutes more when assembling again, not only is difficult to bind and demolish, and wire rope still can produce wearing and tearing to the fitting surface of casing to lead to the untight problem of cooperation, to above-mentioned technical problem, this application has proposed a sealed casing and steam turbine.

Example 1

In an exemplary embodiment of the present application, a steam turbine having a sealed casing installed therein is provided, as shown in fig. 1-3.

The steam turbine comprises a sealed casing, a main shaft 5 and blades 6 matched with the main shaft, wherein the main shaft is arranged between a lower shell and an upper shell through a bearing 4, and the blades matched with the main shaft are positioned in a cavity.

Certainly, when the main shaft and the sealed housing are matched through the bearing, the sealing performance of the bearing position needs to be ensured, and the sealing of the bearing position is a common sealing part in the field, so that a person skilled in the art has the ability to set a corresponding sealing structure according to the requirement, and the detailed description of the specific sealing structure is omitted.

Sealed casing include casing 1, last casing 7 and top casing 11 down that from the bottom up connected gradually, the three forms a cavity jointly, the cavity is used for holding the main shaft and the blade of steam turbine, be equipped with first recess on the top surface of casing down, be equipped with first card foot on the bottom surface of going up the casing, first card foot is used for realizing being connected of casing and lower casing with first recess block, be equipped with the second recess on the top surface of going up the casing, be equipped with second card foot on the bottom surface of top casing, second card foot and second recess block are used for realizing being connected of top casing and lower casing, first recess and second recess are the annular, and its opening both sides all are equipped with rubber circle 10, the rubber circle seals the cavity under the pressure of last casing and top casing.

Further, a hanging ring 8 is arranged on the upper shell and used for driving the upper shell to move by an external hanging lifting device, and hanging rings are arranged on the outer surface of the upper shell and in the channel; the top shell body is provided with at least two hooks 12, and the hooks are used for being externally connected with a lifting device to drive the top shell body to move.

When the sealed machine shell is assembled, the mounting position of the lower shell is firstly determined, the lower shell is fixed, a main shaft and blades are mounted in the fixed machine shell, a bearing is clamped at a joint, a traction rope is matched with a lifting hook to be connected with a lifting ring, the upper shell is lifted by a crane, a first clamping pin of the upper shell is aligned to a first groove of the lower shell, the upper shell is slowly put down, the first clamping pin is clamped into the first groove, rubber rings 10 on two sides of an opening of the groove are tightly attached, a traction rope on the lifting ring is loosened, the traction rope is clamped on the hook, the same operation is carried out, the upper shell is lifted, a second clamping pin of the upper shell is aligned to a second groove of the upper shell, the upper shell is slowly put down, the second clamping pin is clamped into the second groove, the rubber rings on two sides of the second groove are tightly attached to the bottom surface of the upper shell, and the whole sealed machine shell is assembled.

The lower shell comprises a lower cavity with an open top, the upper shell comprises a channel with a top surface and a bottom surface, the bottom surface opening of the channel is communicated with the lower cavity, the top shell is matched with the upper shell to block the top surface opening of the channel, the top opening of the lower shell is positioned inside an inner ring of the annular first groove, and the top surface opening of the upper shell channel is positioned inside an inner ring of the annular second groove, so that the cavity is sealed.

The clamping feet 9 and the grooves are matched to form an annular shape, the cavity is wrapped in the annular shape, and the annular shape is matched with two rings of rubber rings to respectively seal the inner ring and the outer ring of the groove so as to realize the sealing constraint of the cavity;

lower casing, go up casing and top casing three's two butt joints department and seted up annular groove and card foot, through blocking the foot card in the draw-in groove, realize its horizontal direction spacing, the gravity of cooperation itself can realize spacing of vertical direction, thereby will push up the casing and firmly fix on last casing, will go up the casing and firmly fix under on the casing, and, can realize the cooperation that compresses tightly of three casing under the effect of gravity, the sealing washer of deuterogamy gap department makes the cavity in the casing keep apart with external, improve the leakproofness of whole cavity.

Further, heat dissipation holes 15 are formed in the side wall of the lower shell and used for heat exchange between the cavity and the outside of the sealed machine shell so as to reduce the temperature in the cavity; the inner wall of the cavity is pasted with a damp-proof plate 3 for reducing the humidity in the shell.

The radiating holes are blind holes, so that the distance between the cavity and the outside can be shortened, the path length of heat transfer is reduced, the heat dissipation performance is improved, and the sealing performance of the cavity is not influenced; the dampproof board adopt current material that can absorb aqueous vapor and liquid drop in the air to make, install on the inner wall of cavity through the mode of joint or pasting to can avoid taking place to interfere with the blade.

Further, a cooling device is arranged in the lower shell and comprises a circulating pipeline, a refrigerant medium, a circulating pump 14 and a refrigerator 13, the circulating pump and the refrigerator are connected into the circulating pipeline, the refrigerant medium flows in the circulating pipeline, and the cooling device is used for absorbing heat in the cavity and discharging the heat out of the sealed shell through the refrigerator; the circulating pipeline is arranged in the side wall of the lower shell and passes through the heat dissipation holes, and the circulating pipeline is used for absorbing heat in the heat dissipation holes and discharging the heat out of the sealed shell through the refrigerator.

The circulation pipeline constitute by multistage cooling tube 2, the refrigerator accept the higher refrigerant medium of temperature, export the circulating pump through the cooling tube after cooling with it, provide drive power by the circulating pipe, promote refrigerant medium along the cooling tube circulation, absorb the heat in the radiating hole, then import the refrigerator with the higher refrigerant medium of temperature, the heat that the refrigerator produced at the refrigeration in-process is discharged to the cavity outside to realize the interior heat of cavity and external quick exchange, realize rapid cooling.

The refrigerator here chooses for use current compressor cooperation condenser casing can, of course, also can choose for use other refrigeration modes, as long as can realize reducing the temperature of refrigerant medium to with heat from the cavity in discharge to the external world can, in this embodiment, refrigerant medium select water.

The heat generated by the steam turbine can be contacted with the radiating pipe at the radiating hole, the temperature of the radiating pipe is lower, hot air is neutralized, the contact area of the radiating pipe and a high-temperature environment is increased, the radiating speed of the steam turbine is increased, the water temperature rises and then flows back to the cooling box for cooling again, and the cooling is repeated;

the inside cooling device that is provided with of casing, during the steam turbine use, can dispel the heat to the steam turbine, reduce the temperature of steam turbine, avoided the casing to be heated the ageing that arouses for a long time to, reduce the temperature and cooperate dampproofing the board to reduce the humidity in the cavity, can effectively improve the environment that flabellum and cavity inner wall material were located, make it be in the dry state of low temperature, reduce its corrosion probability, reduce the maintenance frequency, and can effectively reduce the production of weak point.

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

Claims (10)

1. The utility model provides a sealed casing, its characterized in that includes lower casing, last casing and the top casing that from the bottom up connected gradually, and the three forms a cavity jointly, the cavity is used for holding the main shaft and the blade of steam turbine, be equipped with first recess on the top surface of casing down, be equipped with first card foot on the bottom surface of going up the casing, first card foot is used for realizing being connected of casing and lower casing with first recess block, be equipped with the second recess on the top surface of going up the casing, be equipped with second card foot on the bottom surface of top casing, second card foot and second recess block are used for realizing being connected of top casing and lower casing, first recess and second recess are the annular, and its opening both sides all are equipped with the rubber circle, the rubber circle seals the cavity under the pressure of last casing and top casing.

2. The sealed enclosure of claim 1, wherein the lower housing includes a lower cavity open at the top, the upper housing includes a channel open at the top and bottom, the channel open at the bottom communicating with the lower cavity, and the top housing cooperates with the upper housing to close off the channel open at the top.

3. The sealed enclosure of claim 2, wherein the upper housing is provided with a lifting ring for an external lifting device to drive the upper housing to move, and the outer surface of the upper housing and the channel are provided with the lifting ring.

4. The sealed enclosure of claim 2, wherein the top housing has at least two hooks, the hooks being adapted to be engaged with an external lifting device to move the top housing.

5. The sealed enclosure of claim 2, wherein the sidewall of the lower housing has heat dissipation holes for heat exchange between the cavity and the outside of the sealed enclosure to reduce the temperature in the cavity.

6. The sealed enclosure of claim 5 wherein moisture barriers are applied to the interior walls of the cavity to reduce moisture in the enclosure.

7. The sealed enclosure of claim 5, wherein the lower housing further comprises a cooling device, the cooling device comprises a circulation pipeline, a refrigerant medium, a circulation pump and a refrigerator, the circulation pump and the refrigerator are connected to the circulation pipeline, the refrigerant medium flows through the circulation pipeline, and the cooling device is used for absorbing heat in the cavity and discharging the heat out of the sealed enclosure through the refrigerator.

8. The hermetic container of claim 7, wherein the circulation line is disposed in the sidewall of the lower case and passes through the heat dissipation hole for absorbing heat in the heat dissipation hole and discharging it outside the hermetic container through the refrigerator.

9. A steam turbine comprising a sealed casing according to any one of claims 1 to 8.

10. The turbine according to claim 9 wherein the turbine further comprises a main shaft and blades fitted on the main shaft, the main shaft being mounted between the lower casing and the upper casing by bearings, the fitted blades on the main shaft being located entirely within the cavity.

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