CN102767398A

CN102767398A - Impeller and main shaft matched structure of turbo expander

Info

Publication number: CN102767398A
Application number: CN2012102278722A
Authority: CN
Inventors: 陈文政; 杨仁泓
Original assignee: UNIECO (CHANGSHU) CO Ltd
Current assignee: UNIECO (CHANGSHU) CO Ltd
Priority date: 2012-07-04
Filing date: 2012-07-04
Publication date: 2012-11-07

Abstract

An impeller and main shaft matched structure of a turbo expander belongs to the technical field of low temperature equipment. The impeller comprises an impeller body with a screw transition hole; the main shaft comprises a main shaft body which is connected with the screw transition hole of the impeller body; the impeller and main shaft matched structure is characterized in that a special-shaped shaft sleeve extends from one side of the impeller body; a special-shaped shaft sleeve matching chamber is formed in the center of one end of the main shaft body; the special-shaped shaft sleeve is arranged in the special-shaped shaft sleeve matching chamber; besides, a screw head fixing hole is concavely formed at the bottom of the special-shaped shaft sleeve matching chamber; a two-head screw is arranged between the impeller body and the main shaft body in a matching manner; the first screw head penetrates through the screw transition hole and then is matched with a first nut; and the second screw head is screwed into the screw head fixing hole and then is locked by a second nut. The impeller and main shaft matched structure of the turbo expander is capable of meeting the requirement of reliable transmission connection in a low-temperature high-speed rotation state, and damaging the impeller and even the entire turbo expander due to loosening can be avoided.

Description

The impeller of turbo-expander and the cooperating structure of main shaft

Technical field

the invention belongs to the Cryo Equipment technical field, are specifically related to a kind of impeller of turbo-expander and the cooperating structure of main shaft.

Background technique

decompressor is divided into two types usually by its motion mode and structural type: one is Piston Expander; Two is turbo-expander.Owing to having characteristics such as flow is big, simple in structure, volume is little, efficient is high and grow service cycle for Piston Expander, turbo-expander is widely used in the various Cryo Equipments.

such as industry the reason of knowledge; Turbo-expander be when expanding with gas speed can variation and use the machinery that transmits energy; Its energy delivered claims that also external work passes to as the endergonic equipment that connects through the main shaft that is connected with impeller usually, and the equipment that connects is like absorptions such as the generator that is not limited to, blower, water pump, pressure-increasing machine, oil brakes.In disclosed Chinese patent document, is no lack of technical information about turbo-expander; Slightly recommend to have with what give an example that " miniature turbo-expander ", CN2185339Y provide " gas suspension formula pottery cryogenic turboexpander ", the CN200955408Y bulletin has " turbine expansion unit ", CN201367920Y to disclose " turbo-expander " and CN202039906U has recommended " a kind of gas-bearing expansion turbine " like CN2388351Y, or the like.

The patented technology scheme that give an example above being not limited to does not all disclose impeller and is able to transmit the teachings that it rotates required moment of torsion well cooperating of main shaft; Because the situation that impeller and main shaft get loose each other takes place in turbo-expander in the prior art easily when high speed rotating; Gently then influence the transmission effect, cause the blade of impeller to damage and even undermine decompressor when serious.

though industry be devoted to untiringly to address the above problem; But because the outlet temperature of decompressor is usually at-150 ℃ even lower; And the shrinkage of material under low temperature environment is big, and especially the material of impeller, main shaft and fastening piece (being used for impeller and main shaft coupled fasteners such as screw bolt and nut etc.) is different, so coefficient of thermal expansion and contraction separately is different; Iff connects by means of fastening piece, is difficult to even can't reaches the connection effect of expectation so.

To above-mentioned prior art; The applicant has made good try; Finally found the way of dealing with problems; And taking to have carried out simulation test in the applicant unit under the strict secrecy provision, the result has shockingly showed beyond thought effect, and the technological scheme that will introduce below produces under this background

Summary of the invention

task of the present invention is to provide a kind of being connected effect and using and satisfy the connection reliability that under the low-temperature and high-speed rotation status, embodies each other and require to avoid undermining impeller between the two because of getting loose and even to undermine impeller and the cooperating structure of main shaft of the turbo-expander of decompressor complete machine situation generation between impeller and the main shaft that help significantly to improve.

task of the present invention is accomplished like this; A kind of impeller of turbo-expander and the cooperating structure of main shaft; Described impeller comprises the impeller body with a screw rod transitional pore; Described main shaft comprises the main shaft body; The main shaft body is fixedly connected with the screw rod transitional pore of impeller body; Be characterised in that: on the end face of a side of said main shaft body and around the circumferencial direction at the position, aperture of screw rod transitional pore, be extended with a special-shaped axle sleeve at said impeller body; And constitute the special-shaped axle sleeve mating cavity of the end face of a recessed main shaft body towards end of said impeller body and the middle position that is positioned at this end at said main shaft body; Described special-shaped axle sleeve is placed in this abnormity axle sleeve mating cavity with tenon fourth of the twelve Earthly Branches fit system, and in the bottom of this abnormity axle sleeve mating cavity and then be concaved with a screw head fixed hole, is equipped with between impeller body and main shaft body that an end has one first screw head and the other end has the double threaded screw of one second screw head; Wherein: first screw head after passing described screw rod transitional pore, be equipped with one be used to stop the double threaded screw play first nut, and second screw head screws in the said screw head fixed hole and by second nut and locks.

in a concrete embodiment of the present invention, the shape of cross section of described special-shaped axle sleeve is the triangle of arc transition, and the shape of cross section of described special-shaped axle sleeve mating cavity is the triangle of arc transition equally.

are in another concrete embodiment of the present invention; On described double threaded screw and towards an end of described main shaft body, constitute a pair of milling flat that is used to supply wrench operated, this to milling flat around 180 ° of the circumferencial direction each intervals of double threaded screw.

technological scheme provided by the invention is owing to be extended with a special-shaped axle sleeve at impeller body towards an end of main shaft body and in the position around the circumferencial direction in the aperture of screw rod transitional pore; And constitute the special-shaped axle sleeve mating cavity that the special-shaped axle sleeve of a confession is inserted with tenon fourth of the twelve Earthly Branches fit system towards an end of impeller body at the main shaft body; Thereby the main shaft body was both connected by its special-shaped axle sleeve mating cavity and special-shaped axle sleeve; Realize being fixedly connected by double threaded screw again with impeller body; Thereby can satisfy the requirement that is in transmission connection reliably under the low-temperature and high-speed rotation status, the situation that undermines impeller because of getting loose and even undermine the turbo-expander complete machine can not occur.

Description of drawings

Fig. 1 is the embodiments of the invention structural drawing.

Fig. 2 is the sectional view of Fig. 1.

Fig. 3 is the A-A sectional view of Fig. 2.

Embodiment

can be expressly understood technical spirit of the present invention and beneficial effect more for the auditor that the makes Patent Office especially public; The claimant general elaborates with embodiment's mode below; But the description to embodiment all is not the restriction to the present invention program, any according to the present invention design done only for pro forma but not substantial equivalent transformation all should be regarded as technological scheme category of the present invention.

see also Fig. 1 and Fig. 2; Show the impeller body 1 of turbo-expander; Central authorities at this impeller body 1 offer a screw rod transitional pore 11, that is to say that the central authorities at the wheel hub of impeller body 1 offer a screw rod transitional pore 11 from one end to the other side.One main shaft body 2 is fixedly connected with impeller body 1 in the position corresponding to screw rod transitional pore 11; So that drive main shaft body 2 by impeller body 1, so by main shaft body 2 drive be in transmission connection with it and according to needs the selectable equipment that connects such as generator, water pump, blower, pressure-increasing machine or oil brake.

are as the technical spirit of technological scheme provided by the invention; On the end face of a side of main shaft body 2 and in the position of the circumferencial direction that centers on screw rod transitional pore 11, be extended with a special-shaped axle sleeve 12 at aforesaid impeller body 1; And main shaft body 2 towards the middle position of an end of impeller body 1 constitute one be used to compensate special-shaped axle sleeve 12 special-shaped axle sleeve mating cavity 21; And in the bottom of this abnormity axle sleeve mating cavity 21 so offer one have an internal thread screw head fixed hole 21, this screw head fixed hole 21 is a blind hole.If special-shaped axle sleeve 12 is defined as tenon; And special-shaped axle sleeve mating cavity 21 is defined as the fourth of the twelve Earthly Branches; So special-shaped axle sleeve 12 shows as the tenon fourth of the twelve Earthly Branches with the form that is fitted to each other of special-shaped axle sleeve mating cavity 21 and cooperates; Very help to ensure the required moment of torsion of rotation between impeller body 1 and the main shaft body 2, the situation that main shaft body 2 skids and even passiveness is rotated can not occur.

One end of the double threaded screw 3 that provide has one first screw head 31; And the other end promptly has one second screw head 32 towards an end of main shaft body 2; First screw head 31 revolves mutually with first nut 311 and screw thread on first screw head 31 and joins passing aforesaid screw rod transitional pore 11 backs; Second screw head 32 is threaded with aforesaid screw head fixed hole 211; And by 321 lockings of second nut, make main shaft body 2 avoid in rotary course, occurring play, more properly say and guarantee well connecting between main shaft body 2 and the impeller body 1 by the cooperation of first, second nut 311,321.

Signal is formed in a pair of milling flat 33 usefulness on the double threaded screw 3 for spanner or similarly tool operation, so that second screw head 32 reliably and effortlessly is fixedly connected with screw head fixed hole 211 among figure.

see also Fig. 3; Signal by this Fig. 3 can be known; The shape of cross section of aforesaid special-shaped axle sleeve 12 is the triangle of arc transition; Here alleged arc transition is meant that the position of leg-of-mutton three seamed edges is circular arc, and same, the shape of cross section of special-shaped axle sleeve mating cavity 21 also is the triangle of arc transition.

Can know by above-mentioned explanation; Double threaded screw 3 is being taken on the effect that main shaft body 2 is fixedly connected with pull-rod type between the impeller body 1; And the interconnect function that transmits driving torque is being taken in being connected between special-shaped axle sleeve 12 and the special-shaped axle sleeve mating cavity 21; It is unreliable and cause the problem that gets loose that this Placement of working along both lines can remedy connection in the prior art; Can satisfy the connection request of low temperature (150 ℃ or the following) high speed rotating (10000n/min or more than) of turbo-expander, the reliability of safeguard work

Claims

1. a kind of impeller of turbo-expander and cooperating structure of main shaft; Described impeller comprises the impeller body (1) with a screw rod transitional pore (11); Described main shaft comprises main shaft body (2); Main shaft body (2) is fixedly connected with the screw rod transitional pore (11) of impeller body (1); It is characterized in that: on the end face of a side of said main shaft body (2) and around the circumferencial direction at the position, aperture of screw rod transitional pore (11), be extended with a special-shaped axle sleeve (12) at said impeller body (1); And constitute the special-shaped axle sleeve mating cavity (21) of the end face of a recessed main shaft body (2) towards end of said impeller body (1) and the middle position that is positioned at this end at said main shaft body (2); Described special-shaped axle sleeve (12) is placed in this abnormity axle sleeve mating cavity (21) with tenon fourth of the twelve Earthly Branches fit system; And in the bottom of this abnormity axle sleeve mating cavity (21) and then be concaved with a screw head fixed hole (211); Be equipped with between impeller body (1) and main shaft body (2) that an end has one first screw head (31) and the other end has the double threaded screw (3) of one second screw head (32); Wherein: first screw head (31) is equipped with one and is used to stop first nut (311) of double threaded screw (3) play after passing described screw rod transitional pore (11), and locks in second screw head (32) the said screw head fixed hole of screw-in (211) and by second nut (321).

2. impeller of turbo-expander according to claim 1 and cooperating structure of main shaft; It is characterized in that the shape of cross section of described special-shaped axle sleeve (12) is the triangle of arc transition, and the shape of cross section of described special-shaped axle sleeve mating cavity (21) is the triangle of arc transition equally.

3. The impeller of turbo-expander according to claim 1 and the cooperating structure of main shaft; It is characterized in that going up and constituting a pair of milling flat (33) that is used to supply wrench operated towards an end of described main shaft body (2) at described double threaded screw (3), this to milling flat (33) around 180 ° of the circumferencial direction each intervals of double threaded screw (3)