CN220248166U - Expansion machine capable of preventing nozzle assembly deformation - Google Patents

Abstract

The utility model discloses an expansion machine capable of preventing nozzle assembly deformation, which belongs to the field of turbine expansion machines and comprises a turbine volute, a rigid rotor with an expansion wheel at the end part and an adjustable nozzle assembly, wherein the adjustable nozzle assembly and the expansion wheel are jointly arranged in the turbine volute, the adjustable nozzle assembly comprises a cover plate, an expansion wheel sealing cover, a rotating disc, blades and a positioning disc which are sequentially arranged from left to right, the blades are clamped between the rotating disc and the positioning disc, the positioning disc is fixed on the turbine volute, the end cover and the cover plate are detachably connected, the positioning disc and the rotating disc are detachably connected, an assembly gap exists between the left end surface of the rotating disc and the right end surface of the cover plate, and an assembly gap exists between the right end surface of an inner hole of a second small end surface of the positioning disc and the left end surface of a baffle plate.

Description

Expansion machine capable of preventing nozzle assembly deformation

Technical Field

The utility model belongs to the technical field of turbine expanders, and particularly relates to an expander capable of preventing nozzle assembly deformation.

Background

The turbine expander is widely applied to industries such as chemical industry, is a key part machine necessary for obtaining cold energy, such as air separation equipment, natural gas liquefaction separation equipment, low-temperature crushing equipment and the like, and is a heart for ensuring the stable operation of the whole equipment.

The turbine expander generally comprises a turbine volute, a rigid rotor with two ends provided with an expander impeller and a compressor impeller respectively, and an expander adjustable nozzle assembly, wherein the expander adjustable nozzle assembly is assembled on a rotating shaft of the rigid rotor and is jointly arranged in the turbine volute; the adjustable nozzle assembly of the conventional expansion machine comprises a positioning disc, nozzle blades attached to the other side of the positioning disc, a rotating disc attached to the other side of the nozzle blades, a cover plate arranged on the other side of the rotating disc, and a sealing cover for an expansion wheel fixed on the other side of the cover plate, wherein an end cover is fixed in a turbine volute, the sealing cover for the expansion wheel is clamped on the cover plate by the end cover, the sealing cover for the expansion wheel and the cover plate are fixed by screws, the cover plate and the positioning disc are fixed together to clamp the rotating disc and the nozzle blades between the cover plate and the positioning disc, a machine body outer cover is sleeved on a rigid rotor, the machine body outer cover is arranged on the right side of the positioning disc, a heat insulation baffle plate is arranged between the machine body outer cover and the positioning disc, the heat insulation baffle plate is attached to the end face of the positioning disc, and the machine body outer cover is used for enabling the adjustable nozzle assembly to be firmly assembled in the turbine volute, and all components of the adjustable nozzle assembly of the conventional expansion machine are sequentially arranged from right to left, and the figure 1 is shown.

In assembling the adjustable nozzle assembly of an expander, there may be assembly clearances between various parts according to engineering requirements, such as between the rotating disk and the nozzle vane, and between the positioning disk and the nozzle vane, in order to reduce clearance leakage between the rotating disk, the nozzle vane and the positioning disk during operation of the expander, the clearances between the rotating disk and the nozzle vane, and between the positioning disk and the nozzle vane are typically small, and as can be seen from fig. 1, since the turbine expander is required to be placed in the turbine volute, the manner in which the various parts of the adjustable nozzle assembly of a conventional turbine expander are connected determines that they can only be placed entirely into the turbine volute after the various parts are assembled on the rotor.

In order to ensure sealing, the end face of the conventional sealing cover is provided with an O-shaped sealing ring, a certain compression amount is required for sealing effect, so that the sealing cover is easily subjected to a certain axial force, the sealing cover is finally transferred to the end face of the nozzle blade with the weakest strength in the nozzle, the nozzle blade is possibly deformed (namely, as people cannot observe the internal environment of the turbine volute, after the sealing condition is achieved between the sealing cover and the cover plate, a worker still operates a tool to push an adjustable nozzle assembly of the expander to abut against the sealing cover, the sealing cover abuts against the expansion wheel cover, and finally the axial force is transferred to a rotating disc, and the rotating disc is easier to deform in the axial direction relative to the sealing cover and the expansion wheel cover because of the large end face of the rotating disc, further, the end face of the nozzle blade rubs with a sliding disc, and the extrusion bites and cannot move), and similarly, the end face of the positioning disc of the conventional adjustable nozzle assembly of the expander has a gap of about 0.1mm with the end face of the heat insulation baffle, and the O-shaped sealing ring is also deformed due to the fact that the inner hole part of the positioning disc is unable to move.

Disclosure of Invention

The utility model aims to provide an expander capable of preventing nozzle assembly deformation, so as to solve the problem that in the process of integrally assembling the conventional expander into a turbine volute, the assembly position and degree cannot be known, and the problem that the blades are easily deformed and blocked due to fastening or extrusion between a rotating disc and the blades and between a positioning disc and the blades caused by forced extrusion can be solved.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides an prevent expansion machine that nozzle assembly warp, includes turbine volute, the end has the rigid rotor and the adjustable nozzle subassembly of expansion wheel, adjustable nozzle subassembly and expansion wheel settle jointly in the turbine volute, be fixed with adiabatic baffle on the rigid rotor, adjustable nozzle subassembly includes apron, expansion wheel sealed lid, rolling disc, blade and the positioning disk that set gradually from left to right, the blade centre gripping is between rolling disc and positioning disk, the apron left side is provided with the end cover, the positioning disk is fixed on the turbine volute, the terminal surface of expansion wheel is laminated with the sealed terminal surface of expansion wheel, the end cover can be dismantled with the apron and be connected, positioning disk and rolling disc can dismantle the terminal surface of connection and the terminal surface laminating of rolling disc with the terminal surface of apron, there is the assembly clearance rolling disc left side terminal surface and apron right side terminal surface.

Through adopting above-mentioned technical scheme, because end cover and apron can dismantle the connection, positioning disk and rolling disk can dismantle the terminal surface laminating of connection and rolling disk and apron for can now fix the apron on the end cover when the assembly, place the turbine spiral case with the combination of rolling disk, blade and positioning disk afterwards in and fix the positioning disk to the turbine spiral case, and because just consider the positioning disk when the design the assembly clearance exists with apron right side terminal surface in rolling disk left side terminal surface, consequently, just can not take place the extrusion between rolling disk and the apron, and then just can not appear the problem of the terminal surface deformation extrusion blade of rolling disk inner ring position.

Preferably, the rotating disc is a ring body with a through hole in the middle, the cross section of the ring body is concave, the cover plate is a ring body with a through hole in the middle, the cross section of the ring body is convex, the rotating disc and the cover plate are mutually embedded, and when the end face of the rotating disc is in contact with the end face of the second layer of the cover plate, an assembly gap exists between the end face of the concave part of the rotating disc and the end face of the convex part of the cover plate.

Through adopting above-mentioned technical scheme, the terminal surface of rolling disc and the second floor terminal surface of apron conflict in order to guarantee the holistic stability of adjustable nozzle assembly part, have the fit-up gap between the terminal surface of rolling disc concave part and the terminal surface of apron bulge then be used for avoiding appearing the terminal surface deformation extrusion blade's of rolling disc inner ring position problem.

Preferably, an assembly gap of more than 0.5mm exists between the end face of the concave portion of the rotating disk and the end face of the convex portion of the cover plate.

Preferably, the positioning disc is axially divided into two parts to form a thin positioning disc and a positioning pressure disc, the positioning pressure disc is fixed on the outer end face of the turbine volute, and the blades are clamped between the rotating disc and the thin positioning disc.

Preferably, the thin positioning disc and the positioning pressure disc are fixed through connecting screws so as to prevent the thin positioning disc from rotating in the axial direction.

Through adopting above-mentioned technical scheme, after connecting screw fixes thin positioning disk and positioning pressure disk, and at this moment and through screw 11 pulling location to the right of thin positioning disk 9 and rolling disc 6, just can guarantee that the terminal surface of rolling disc and the terminal surface of apron keep certain rotation assembly clearance.

Preferably, the rigid rotor is fixedly provided with a heat insulation partition board, the diameter of the inner ring of the thin positioning disk is smaller than that of the inner ring of the positioning pressure disk, and when the expansion wheel is abutted against the expansion wheel sealing cover, the assembly gap between the thin positioning disk and the heat insulation partition board is larger than 2mm.

Compared with the prior art, the utility model provides the expander for preventing the nozzle from being assembled and deformed, which has the following beneficial effects:

according to the utility model, the rotating disc is arranged to be the ring body with the through hole in the middle of the cross section of the ring body with the concave shape, the cover plate is arranged to be the ring body with the through hole in the middle of the cross section of the ring body with the convex shape, when the end face of the rotating disc is abutted against the end face of the second layer of the cover plate, an assembly gap exists between the end face of the concave part of the rotating disc and the end face of the convex part of the cover plate, the problem that the blades are extruded by deformation of the end face of the inner ring of the rotating disc is avoided, meanwhile, the positioning disc is divided into two parts in the axial direction, the weight of the whole positioning disc can be reduced, the installation is convenient, and in addition, the assembly gap between the thin positioning disc and the heat insulation baffle plate is larger than 2mm to avoid the contact between the thin positioning disc and the heat insulation baffle plate.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate and together with the embodiments of the utility model and do not constitute a limitation to the utility model, and in which:

FIG. 1 is a cross-sectional view of a conventional expander turbine volute and adjustable nozzle assembly partially assembled;

FIG. 2 is an enlarged schematic view of portion A of FIG. 1;

FIG. 3 is a cross-sectional view of a turbine volute and adjustable nozzle assembly portion of an expander that prevents nozzle assembly distortion in accordance with the present utility model;

FIG. 4 is an enlarged schematic view of portion B of FIG. 3;

FIG. 5 is a schematic diagram showing the connection between a rotating disk and a thin positioning disk of an expander for preventing nozzle assembly deformation according to the present utility model;

in the figure: 1. a turbine volute; 2. a rigid rotor; 21. an expansion wheel; 3. an end cap; 4. sealing cover of expansion wheel; 5. a cover plate; 6. a rotating disc; 7. a blade; 8. a positioning plate; 9. a thin positioning disk; 10. positioning a pressure plate; 11. a connecting screw; 12. a first sealing ring; 13. sealing sleeve; 14. a second sealing ring; 15. compressing the cylindrical bolt; 16. a cylindrical spring; 17. a heat insulating partition; 18. and positioning a cylindrical bolt.

Description of the embodiments

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 3 and 4, the present utility model provides a technical solution: the utility model provides an prevent expansion machine of nozzle assembly deformation, includes turbine spiral case 1, rigid rotor 2 and adjustable nozzle assembly that the tip has expansion wheel 21, adjustable nozzle assembly and expansion wheel 21 settle jointly in turbine spiral case 1, be fixed with adiabatic baffle 17 on the rigid rotor 2, adjustable nozzle assembly includes apron 5, expansion wheel sealed lid 4, rolling disc 6, blade 7 and positioning disk 8 that set gradually from left to right, blade 7 centre gripping is between rolling disc 6 and positioning disk 8, apron 5 left side is provided with end cover 3, positioning disk 8 is fixed on turbine spiral case 1, the terminal surface of expansion wheel 21 is laminated with expansion wheel sealed lid 4 terminal surfaces, end cover 3 and apron 5 can dismantle the connection, positioning disk 8 and rolling disc 6 can dismantle the terminal surface laminating of connection and rolling disc 6 with the terminal surface of apron 5, there is the fit clearance in rolling disc 6 left side terminal surface and apron 5 right side terminal surface, wherein, is provided with sealing ring 12 in order to guarantee the seal between the two between apron 5 and end cover 3.

The rotating disc 6 is a ring body with a through hole in the middle, the cross section of the ring body is concave, the cover plate 5 is a ring body with a through hole in the middle, the cross section of the ring body is convex, the rotating disc 6 and the cover plate 5 are mutually embedded, an assembly gap exists between the end face of the concave part of the rotating disc 6 and the end face of the convex part of the cover plate 5 when the end face of the rotating disc 6 is in contact with the second layer of end face of the cover plate 5, and the assembly gap is larger than 0.5mm between the end face of the concave part of the rotating disc 6 and the end face of the convex part of the cover plate 5.

The positioning disc 8 is axially divided into two parts to form a thin positioning disc 9 and a positioning pressure disc 10, the positioning pressure disc 10 is fixed on the outer side end face of the turbine volute 1, the blades 7 are clamped between the rotating disc 6 and the thin positioning disc 9, the thin positioning disc 9 and the positioning pressure disc 10 are fixed through connecting screws 11 to avoid rotation of the thin positioning disc 9 in the axial direction, at the moment, the thin positioning disc 9 and the rotating disc 6 are pulled to the right through the screws 11 to be positioned, a certain rotation assembly gap can be kept between the end face of the rotating disc and the end face of the cover plate, the inner ring diameter of the thin positioning disc 9 is smaller than the inner ring diameter of the positioning pressure disc 10, when the expansion wheel 21 is in contact with the expansion wheel sealing cover 4, the assembly gap between the thin positioning disc 9 and the heat insulation partition 17 is larger than 2mm, and a sealing ring two 14 is arranged between the connecting part of the positioning pressure disc 10 and the outer side end face of the turbine volute 1 to ensure sealing between the two.

Further, in the present embodiment, the thin positioning disk 9 and the rotating disk 6 are connected by a plurality of positioning cylindrical bolts 18, after the connection, the distance between the opposite end surfaces clamped between the thin positioning disk 9 and the rotating disk 6 is ensured to be larger than the thickness of the blade 7 to ensure that the blade 7 can rotate in the inside thereof without seizing, and the difference between the distance between the opposite end surfaces of the thin positioning disk 9 and the rotating disk 6 and the thickness of the blade is greater than 0.1mm, wherein the end surfaces of the plurality of positioning cylindrical bolts 18 have a distance of greater than 0.1mm from the end surface of the rotating disk, a plurality of pressing cylindrical bolts 15 are screwed on the thin positioning disk 9, the end portions of the pressing cylindrical bolts 15 are arranged penetrating the rotating disk 6, and the rotating disk 6 can slide on the pressing cylindrical bolts 15, and a cylindrical spring 16 is clamped between the pressing cylindrical bolts 15 and the rotating disk, the cylindrical spring 16 enables the end surfaces of the three parts to be closely adhered to reduce the air leakage when the rotating disk 6, the blade 7 and the thin positioning disk 9 do not need to rotate, and the end surfaces of the blade 7 can not be seized in the process of clamping the thickness between the two end surfaces of the blade 7 and the rotating disk 7 due to the fact that the thickness of the blade 7 is not clamped between the opposite end surfaces of the rotating disk 7 is greater than the thickness between the rotating disk 7 and the rotating disk.

The working principle and the using flow of the utility model are as follows:

when the product is installed, the expansion wheel sealing cover 4 is fixed on the cover plate 5, then the cover plate 5 and the end cover 3 are fixed together through bolts, whether the sealing effect of the sealing ring I12 is achieved or not can be directly observed, then the rotating disc 6, the blades 7 and the positioning disc are assembled, namely the blades 7 are clamped between the rotating disc 6 and the positioning disc 8, the rotating disc 6 and the thin positioning disc 9 are connected together through the bolts, then the rotating disc 6, the blades 7 and the thin positioning disc 9 are integrally placed in the turbine 1, the end face of the rotating disc 6 and the end face of the cover plate 5 are abutted together, at the moment, an assembly gap of more than 0.5mm exists between the end face of the concave part of the rotating disc 6 and the end face of the convex part of the cover plate 5, so that the cover plate 5 can not squeeze the rotating disc 6, and then, the positioning pressure plate 10 is connected with the thin positioning disk 9 through the connecting screw 11, at the moment, the thin positioning disk 9 and the rotating disk 6 are pulled to the right to be positioned through the screw 11, so that a certain rotation assembly gap can be kept between the end face of the rotating disk and the end face of the cover plate, finally the positioning pressure plate 10 is fixed on the end face outside the turbine volute 1 through bolts, finally the rigid rotor 2 with the expansion wheel 21 is inserted into the turbine volute 1, when the expansion wheel 21 is in contact with the expansion wheel sealing cover 4, the assembly gap between the thin positioning disk 9 and the heat insulation baffle 17 is larger than 2mm, so that the heat insulation baffle 17 does not press the thin positioning disk 9, and the structural arrangement can effectively solve the problems that the rotating disk 6 and the blades 7 are easily caused by forced extrusion because the assembly position cannot be mastered in the prior device by comparing the conventional expansion machines shown in fig. 1 and 2, the problem that the blades 7 are deformed and blocked due to the extrusion between the positioning disc 8 and the blades 7 in the conventional expander.

With the development of the air separation equipment towards the large-scale, the performance requirement on the expander is higher and higher, the operation is required to be stable and convenient, and the maintenance and the replacement are also more convenient and economical. Through this kind of prevent nozzle assembly deformation's expander, can avoid the trouble of assembly deformation, no longer need frequently install and remove the expander, saved the maintenance greatly and installed and removed the expense, improved the economic nature of equipment.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (6)

1. The utility model provides an prevent expansion machine that nozzle assembly warp, includes turbine spiral case (1), rigid rotor (2) and adjustable nozzle assembly that the tip has expansion wheel (21), adjustable nozzle assembly and expansion wheel (21) settle jointly in turbine spiral case (1), the cover is equipped with the organism enclosing cover on rigid rotor (2), adjustable nozzle assembly includes apron (5), expansion wheel sealed lid (4), rolling disc (6), blade (7) and positioning disk (8) that set gradually from a left side, blade (7) centre gripping is between rolling disc (6) and positioning disk (8), apron (5) left side is provided with end cover (3), positioning disk (8) are fixed on turbine (1), the terminal surface of expansion wheel spiral case (21) is laminated with expansion wheel sealed lid (4) terminal surface, is provided with a heat insulating partition between organism enclosing cover and positioning disk, heat insulating partition (17) are laminated with the terminal surface of positioning disk, its characterized in that: the end cover (3) is detachably connected with the cover plate (5), the positioning disc (8) is detachably connected with the rotating disc (6), the end face of the rotating disc (6) is attached to the end face of the cover plate (5), and an assembly gap exists between the left end face of the rotating disc (6) and the right end face of the cover plate (5).

2. An expander for preventing nozzle assembly distortion as set forth in claim 1 wherein: the rotary disc (6) is a ring body with a through hole in the middle, the cross section of the ring body is concave, the cover plate (5) is a ring body with a through hole in the middle, the cross section of the ring body is convex, the rotary disc (6) and the cover plate (5) are mutually embedded, and when the end face of the rotary disc (6) is abutted against the end face of the second layer of the cover plate (5), an assembly gap exists between the end face of the concave part of the rotary disc (6) and the end face of the convex part of the cover plate (5).

3. An expander for preventing nozzle assembly distortion as set forth in claim 2 wherein: an assembly gap of more than 0.5mm exists between the end face of the concave part of the rotating disc (6) and the end face of the convex part of the cover plate (5).

4. An expander for preventing nozzle assembly distortion as set forth in claim 1 wherein: the positioning disc (8) is axially divided into two parts to form a thin positioning disc (9) and a positioning pressure disc (10), the positioning pressure disc (10) is fixed on the outer side end face of the turbine volute (1), and the blades (7) are clamped between the rotating disc (6) and the thin positioning disc (9).

5. An expander for preventing nozzle assembly distortion as set forth in claim 4 wherein: the thin positioning disc (9) and the positioning pressure disc (10) are fixed through connecting screws (11) so as to prevent the thin positioning disc (9) from rotating in the axial direction.

6. An expander for preventing nozzle assembly distortion as set forth in claim 5 wherein: the inner ring diameter of the thin positioning disc (9) is smaller than that of the positioning pressure disc (10), and when the expansion wheel (21) is in contact with the expansion wheel sealing cover (4), the assembly gap between the thin positioning disc (9) and the heat insulation partition plate (17) is larger than 2mm.