CN202690148U

CN202690148U - Connecting shaft structure of external work output connecting device of turboexpander

Info

Publication number: CN202690148U
Application number: CN 201220318917
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: 2013-01-23
Anticipated expiration: 2022-07-04

Abstract

The utility model discloses a connecting shaft structure of an external work output connecting device of a turboexpander, belonging to the technical field of low-temperature equipment. The external work output connecting device of the turboexpander comprises a connecting sleeve, a left flange plate, a right flange plate, a pair of connecting shaft supporting mechanisms and a pair of sealing ring bases, wherein the connecting sleeve has a sleeve cavity and connecting shaft supporting mechanism cavities are at the centers of the two ends of the connecting sleeve respectively. The connecting shaft structure comprises connecting shafts supported on the connecting shaft supporting mechanisms, wherein air inlets are formed on the connecting sleeve; the air inlets are provided with air inlet passages; an air returning hole is formed on the connecting sleeve; oil inlets are formed at the two ends of the connecting sleeve; the oil inlets are provided with oil inlet passages; an oil returning hole is formed on one side of the connecting sleeve; an oil clearance is formed between the connecting shaft supporting mechanisms and the sealing ring bases; the two ends of the connecting shafts form a sealed matching section; the connecting shaft structure is characterized in that oil throwing discs are arranged on the connecting shafts; and the oil throwing discs and one end of a bearing bush matching section form oil throwing troughs. The connecting shaft structure of the external work output connecting device of the turboexpander has the advantages of both lubricating and sealing effects.

Description

The connecting axle structure of the external work output connector of turbo-expander

Technical field

The utility model belongs to the Cryo Equipment technical field, is specifically related to a kind of connecting axle structure of external work output connector of turbo-expander

Background technique

Decompressor is divided into two classes usually by its motion mode and structural type: one is Piston Expander; Two is turbo-expander.Owing to having the characteristics such as flow is large, 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.

As the industry's knowledge of the reason, turbo-expander be during with gas expansion speed can variation and use the machinery of transferring energy, the energy of its transmission also claims external work, usually by the connected equipment that connects such as absorptions such as the generator that is not limited to, blower, water pump, pressure-increasing machine, oil brakes.In published Chinese patent literature, is no lack of the technical information about turbo-expander, slightly recommend to have with what exemplify that " Miniature turbine expansion engine ", CN2185339Y provide " gas suspended ceramic low-temp. turbine expansion engine ", the CN200955408Y bulletin has " Turbine expansion unit ", CN201367920Y to disclose " turbo-expander " and CN202039906U has recommended " a kind of gas-bearing expansion turbine " such as CN2388351Y, etc.

As is known in the industry, because therefore the rotating speed high (10000n/min more than) of turbo-expander when operation must seal and lubricated measure of working along both lines taking as the coupling shaft of external work output connector.But in the process that the bearing housing that is used for the supporting coupling shaft is lubricated, tend to occur lubricant oil and following matching gap between coupling shaft and the bearing housing towards the problem that is connected the tip of the axis and spreads, with regard to the end that coupling shaft is connected with decompressor, can produce pollution to the air supply system in the air chamber of decompressor from the lubricant oil that the coupling shaft end oozes out; With regard to coupling shaft with connect with regard to the end that such as aforesaid generator, blower, water pump, pressure-increasing machine, oil brake etc. of equipment be in transmission connection, the lubricant oil that oozes out from the coupling shaft end can pollute the equipment of connecting.And the leakage of lubricant oil also can affect the lubrication effect of bearing housing and waste lubricant oil.

For addressing the above problem, prior art is poured into attention the stuffing box gland that is arranged in the packing holder and the material of the fiting effect between the coupling shaft and stuffing box gland usually, but only facts have proved and can play the effect of getting half the result with twice the effort.

Therefore, how sealing with lubricated between find the rational balance point to become that industry is paid close attention to for a long time and expect the technical problem of early settlement, but be showed no all technology enlightenments of being used for reference that has in disclosed patent and the non-patent literature up to now, the applicant has done time consuming research and trial for this reason, finally find a way to resolve the problem, technological scheme described below produces under this background

Summary of the invention

Task of the present utility model is to provide a kind of connecting axle structure that can effectively stop for the external work output connector of the turbo-expander of the lubricated lubricant oil of the bearing housing that supports rotationally coupling shaft being used sealing that guarantee is not mutually exclusive and lubrication effect from the matching gap between coupling shaft and the bearing housing towards being connected the tip of the axis infiltration.

Task of the present utility model is finished like this, a kind of connecting axle structure of external work output connector of turbo-expander, the external work output connector of described turbo-expander comprise having the coupling sleeve that sleeve chamber and the middle position at two ends respectively offer a coupling shaft support mechanism chamber; One is fixed on a left end and left flange plate offer left packing holder chamber at middle position of coupling sleeve; One is fixed on right-hand member and the right flange plate offer right packing holder chamber at middle position of coupling sleeve; A pair of coupling shaft support mechanism, one of them coupling shaft support mechanism are arranged in the described coupling shaft support mechanism chamber of coupling sleeve left end, and another then is arranged in the coupling shaft support mechanism chamber of right-hand member; A pair of packing holder, one of them packing holder are arranged in the described left packing holder chamber, and another then is arranged in the described right packing holder chamber; Described connecting axle structure comprise two ends be bearing in rotationally on the coupling shaft support mechanism be sealed and matched with packing holder and lean out packing holder and the middle part is positioned at a coupling shaft in sleeve chamber, wherein: on described coupling sleeve and the two ends that are positioned at coupling sleeve respectively offer an inlet hole, each inlet hole has an intake duct that extends towards the direction of described packing holder, on coupling sleeve and the two ends that are positioned at equally coupling sleeve respectively offer a return-air hole, each return-air hole has the return-air road that extends towards the direction of packing holder, advance, return-air hole is separated by 180 ° around the circumferencial direction of coupling sleeve each other, two ends at coupling sleeve also respectively offer an oil inlet hole, each oil inlet hole has an oil input channel that extends towards the direction of described coupling shaft support mechanism, and under the coupling sleeve use state towards under a side offer a spill port that communicates with the sleeve chamber, have one to be used for to be introduced by described oil input channel the lubricant oil that flows out in described coupling shaft support mechanism and the matching gap between coupling shaft support mechanism and described coupling shaft and on being opened in coupling sleeve, to draw oil clearance in the oilhole introducing sleeve chamber consisting of between described coupling shaft support mechanism and the described packing holder, each formation of the two ends of described coupling shaft has a diameter to cooperate section and diameter to cooperate the stuffing box gland cooperation section of the diameter of section less than described bearing housing less than the bearing housing of the diameter at the middle part of coupling shaft, bearing housing cooperates section and described coupling shaft support mechanism to be rotatably assorted, and stuffing box gland cooperates section and described packing holder to be sealed and matched, be characterised in that: on described coupling shaft and being positioned at described stuffing box gland, cooperate section to cooperate the endface position of an end of section to consist of towards described bearing housing to have and be projected on the disc that stuffing box gland cooperates the surface of section, formation between the end face of an end of stuffing box gland cooperation section is got rid of oil groove at this disc and the described bearing housing section of cooperation, and it is corresponding with described oil clearance that this gets rid of oil groove.

In a specific embodiment of the present utility model, described disc is the shape of circular cone stage body, and the stub end of this circular cone stage body is towards the described oil groove that gets rid of.

In another specific embodiment of the present utility model, described a pair of coupling shaft support mechanism respectively comprises bearing housing, one group of bearing shell, in, outer block plate and snap ring, bearing housing is fixed in the described coupling shaft support mechanism chamber, this bearing housing has a bearing shell mating cavity, in this bearing shell mating cavity and around the circumferencial direction of bearing shell mating cavity, offer the bearing shell supporting foot groove that equates with the quantity of described one group of bearing shell, adjacent bearing shell supporting foot groove among offers an oil-feed through hole, each oil-feed through hole communicates with oil groove on being opened in bearing housing, towards the side formation of interior block plate one interior block plate chamber is arranged at bearing housing, and bearing housing outward a side of block plate consist of an outer block plate chamber and an annular groove arranged, annular groove is positioned at the outside in outer block plate chamber, one group of bearing shell is arranged in the described bearing shell mating cavity, each bearing shell consists of towards a side of the chamber of bearing shell mating cavity wall and along the length direction of bearing shell a bearing shell supporting foot that is projected on the surface of bearing shell, the bearing shell supporting foot matches with described bearing shell supporting foot groove, maintain the bearing shell space between the adjacent bearing shell, the bearing shell space communicates with described oil-feed through hole, interior block plate matches with described interior block plate chamber, outer block plate is arranged in the described outer block plate chamber, the snap ring holding is in annular groove, externally block plate stops, match in the bearing shell chamber that the bearing housing of described coupling shaft cooperates section to consist of with being enclosed each other by one group of bearing shell, described oil input channel communicates with described oil groove, and bearing shell chamber and bearing housing cooperate that formed matching gap communicates with the described oil groove that gets rid of between the surface of section.

In another specific embodiment of the present utility model, the middle position of described a pair of packing holder and towards a side of described disc respectively be embedded with one with disc paste being used for of touching stop lubricant oil towards the direction infiltration that deviates from described oil clearance and be nested with oil resistance stuffing box gland on described coupling shaft, and opposite side respectively is embedded with one and be used for stops extraneous gas to enter described coupling shaft support mechanism and be nested with equally choke stuffing box gland on coupling shaft, on each packing holder, also offer a pressure air that is used for coming from intake duct that communicates with described intake duct and cause packing holder intake duct in the space between described oil resistance stuffing box gland and the choke stuffing box gland, and respectively offer one communicate with described return-air road for the packing holder air outlet channel that the pressure air in the space between oil resistance stuffing box gland and the choke stuffing box gland is caused the return-air road.

In another specific embodiment of the present utility model, on the sidewall of the circumferencial direction of described packing holder, be arranged with one group of seal ring with the interval state, wherein: be positioned at seal ring on the packing holder in described left packing holder chamber and the chamber wall in left packing holder chamber and consist of sealing, and the chamber wall formation that is positioned at seal ring and right packing holder chamber on the packing holder in described right packing holder chamber seals.

The technological scheme that the utility model provides is owing to cooperate section to cooperate the endface position of an end of section to consist of towards bearing housing a disc is arranged on coupling shaft and being positioned at stuffing box gland, therefore under the coupling shaft rotary state, the lubricant oil that comes from the coupling shaft support mechanism can be got rid of into getting rid of oil groove, force lubricant oil to enter the sleeve chamber and lead to external fuel tank by spill port through drawing oilhole from oil clearance, thereby can stop lubricant oil to infiltrate into the connection the tip of the axis towards the direction of packing holder, play ideally lubricated effect with sealing the double gain of having both.

Description of drawings

Fig. 1 is example structure figure of the present utility model.

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

Fig. 3 is application examples schematic representation of the present utility model.

Embodiment

For the auditor that the makes Patent Office especially public can be expressly understood technical spirit of the present utility model and beneficial effect more, the claimant general elaborates in embodiment's mode below, but all be not restriction to the utility model scheme to embodiment's description, any according to the utility model design done only for pro forma but not substantial equivalent transformation all should be considered as the technical solution of the utility model category.

Embodiment:

See also Fig. 1 and Fig. 2, provided a coupling sleeve 1 of the external work output connector of turbo-expander, the two ends of this coupling sleeve 1 are that left and right end respectively is provided with a fastening flange limit 18 to extending out, and offer one group of flange plate fixed hole 181 with the interval state on each fastening flange limit 18.At the two ends of coupling sleeve 1 and separately the position near corresponding fastening flange limit 18 offers an inlet hole 13, preferred scheme be with a pair of inlet hole 13 be opened in coupling sleeve 1 under the use state towards on the two ends of a side, come from compressed air source unit for example the device of air compressor or suction booster and so on pressure air or claim pressurized air to introduce by the road inlet hole 13, each inlet hole 13 have one be used for pressure air towards below the direction of the packing holder 5 that also will describe draw the air entraining passage 131 that send, that is to say that air entraining passage 131 extends towards the direction of packing holder 5.Again, on the coupling sleeve 1 and under the use state towards under the two ends at position respectively offer a return-air hole 14, each return-air hole 14 has a return-air road 141(who extends towards the direction of packing holder 5 equally specifically can be referring to Fig. 2).And, the two ends of coupling sleeve 1 and preferably under the use state towards on a side offer an oil inlet hole 15, oil inlet hole 15 has the oil input channel 151 that extends to the direction of the following coupling shaft support mechanism 4 that also will describe in detail one day, and also respectively offer one at the two ends of coupling sleeve 1 and draw oilhole 17, respectively draw oilhole 17 and communicate with the sleeve chamber 11 of coupling sleeve 1.Also, under the coupling sleeve 1 use state towards under a side offer one and be used for entering into the spill port 16 that lubricant oil sleeve chamber 11 in causes the fuel tank of outside by the road.By shown in Figure 1, each consists of at the two ends of coupling sleeve 1 a coupling shaft support mechanism chamber 12.

One left flange plate 2 shows by one group of first screw 23(Fig. 2) fixing with the flange plate fixed hole 181 on the fastening flange limit 18 of aforesaid coupling sleeve 1 left end, consisting of at the central position of left flange plate 2 has a left packing holder chamber 21, and offers one group in the edge of the circumferencial direction of left flange plate 2 with the interval state and be used for showing with spiral case 8(Fig. 3 of decompressor) fixing left flange plate fixed hole 22.

One right flange plate 3 is fixing with the flange plate fixed hole 181 on the fastening flange limit 18 of the right-hand member of aforesaid coupling sleeve 1 by one group of second screw 33, consisting of at the central position of right flange plate 3 has a right packing holder chamber 31, and offers one group with the interval state equally in the edge of the circumferencial direction of this right flange plate 3 and be used for and the right flange plate fixed hole 32 that connects equipment 9 generator 91, pressure-increasing machine 92 or blower 93 etc. as shown in Figure 3 and be fixedly connected with.

Because it is identical being arranged on the structure of the coupling shaft support mechanism 4 in the coupling shaft support mechanism chamber 12 of the left end of coupling sleeve 1 and right-hand member, so the claimant elaborates for a coupling shaft support mechanism 4 in left side shown in Figure 1 below.

Above mentioned coupling shaft support mechanism 4 preferably but not the structure that definitely is limited to is as follows: comprise bearing housing 41, one group of bearing shell 42, in, outer block plate 43,44 and snap ring 45, bearing housing 41 is arranged in the coupling shaft support mechanism chamber 12 and with one group of the 3rd screw 416 and the first screw hole 121 that is preset on the coupling shaft support mechanism chamber 12 and fixes, this bearing housing 41 has a bearing shell mating cavity 411, on the wall of the chamber of this bearing shell mating cavity 411 and around the circumferencial direction of this chamber wall, offer the bearing shell supporting foot groove 4111 that one group of quantity equates with the quantity of bearing shell 42 with the interval state, offer an oil-feed through hole 4112 between the adjacent bearing shell supporting foot groove 4111, each oil-feed through hole 4112 communicates with on the outer wall that is opened in bearing housing 41 and oil groove 412 that ring leads to, and oil groove 412 communicates (Fig. 2 shows) with aforesaid oil input channel 151.The lubricant oil of being introduced by oil inlet hole 15 enters in the whole bearing shell mating cavity 411 behind oil input channel 151, oil groove 412 and oil-feed through hole 4112 successively.Consisting of towards a side of interior block plate 43 at bearing housing 41 has an interior block plate chamber 413, and bearing housing 41 outward a side of block plate 44 consist of and an outer block plate chamber 414 arranged and offer an annular groove 415, wherein, annular groove 415 is positioned at the outside in outer block plate chamber 414.One group of bearing shell 42 quantity in the present embodiment is four pieces, but is not absolute, therefore can not limit the technological scheme that the utility model provides with the number of bearing shell 42.Because the quantity of one group of bearing shell 42 has four pieces, therefore aforesaid bearing shell supporting foot groove 4111 and oil-feed through hole 4112 respectively have four, when one group of bearing shell 42 consists of the state that a bearing shell chamber 423 is arranged to enclose each other and is positioned at bearing shell mating cavity 411, each bearing shell 42 is placed in the aforesaid bearing shell supporting foot groove 4111 towards a side of the chamber of bearing shell mating cavity 411 wall and along the bearing shell supporting foot 421 on the surface that is projected on bearing shell 42 that the length direction of bearing shell 42 extends, and the space that keeps between the adjacent bearing shell 42 constitutes bearing shell space 422.Interior block plate 43 is embedded in the aforesaid interior block plate chamber 413, and with example, outer block plate 44 is placed in the aforesaid outer block plate chamber 414, and by snap ring 45 snap in annular groove 415 and externally block plate 44 stop.

Please continue to see Fig. 1 and Fig. 2, because it is identical being arranged on the structure of the packing holder 5 in packing holder 5 and the right packing holder chamber 31 that is arranged on right flange plate 3 in the left packing holder chamber 21 of left flange plate 2, so the claimant only describes in detail for the packing holders 5 that are arranged in the left packing holder chamber 21 below.

Screw hole default on packing holder 5 usefulness the 4th screw 56 and the aforesaid coupling sleeve 1 is fixed, be embedded with an oil resistance stuffing box gland 51 in the central authorities of sealing ring support 5 and towards a side of aforesaid bearing housing 41, and opposite side is embedded with a choke stuffing box gland 52, and also offers a packing holder intake duct 53 that communicates with aforesaid intake duct 131 and a packing holder air outlet channel 54 that communicates with aforesaid return-air road 141 on sealing ring support 5.In addition, be embedded with one group of seal ring 55 that is used for forming with the chamber wall in aforesaid left packing holder chamber 21 sealing in the edge of the circumferencial direction of packing holder 5, seal ring 55 consists of sealing with the chamber wall in left packing holder chamber 21.

The connecting axle structure that the utility model provides is as follows: comprise a coupling shaft 6, each consists of at the two ends of this coupling shaft 6 has a bearing housing to cooperate section 62 and one stuffing box gland to cooperate section 63, bearing housing cooperates the diameter of section 62 less than the diameter at the middle part of coupling shaft 6, and stuffing box gland cooperates the diameter of section 63 to cooperate the diameter of section 62 little than bearing housing, thereby makes two sections of coupling shaft 6 to form step-like.Wherein: bearing housing cooperates section 62 to match with aforesaid bearing shell chamber 423, and stuffing box gland cooperates sections 63 to match with aforesaid oil resistance stuffing box gland 51 and choke stuffing box gland 52, and the middle part of coupling shaft 6 is positioned at sleeve chamber 11.

By shown in Figure 2, between bearing housing 41 and packing holder 5, maintain a space, constitute oil clearance 7 by this space, oil clearance 7 communicates with sleeve chamber 11 through the aforesaid oilhole 17 that draws.The slot of lubricant oil between the bearing housing section of cooperation 62 of bearing shell 42 and coupling shaft 6 that enters in the bearing shell mating cavity 411 enters oil clearance 7, the lubricant oil that enters into oil clearance 7 is introduced in the sleeve chamber 11 through the aforesaid oilhole 17 that draws, and then introduced in the fuel tank by the pipeline (oil pipe) that connects with spill port 16, specifically can be labeled in referring to the claimant arrow of the flow direction of the expression lubricant oil among Fig. 2.

Still see Fig. 2, because aforesaid seal ring intake duct 53 communicates with intake duct 131, again since seal ring intake duct 53 corresponding between oil resistance stuffing box gland 51 and the choke stuffing box gland 52, therefore under the pressure-acting of air-flow, pressure air can be respectively towards oil resistance, choke stuffing box gland 51,52 direction is divided into two-way, one the tunnel plays the lubricant oil that stops in the aforesaid oil clearance 7 permeates towards the direction that deviates from oil clearance 7, that is to say to force lubricant oil to flow and avoid lubricant oil to let out oozing towards the ends of coupling shaft 6 behind oil resistance stuffing box gland 51 and choke stuffing box gland 52 successively to the direction of oil clearance 7, another road air-flow stops the coupling shaft support mechanism 4 of the gas invasion and attack coupling shaft support mechanism 4(left end that comes from decompressor).The pressure air of the redundancy of being introduced by seal ring intake duct 53 is drawn through packing holder air outlet channel 54.Be located in oil resistance, the choke stuffing box gland 51,52 on the packing holder 5 of being arranged at of right-hand member, be divided into wherein a tunnel playing equally and stop lubricant oil towards the effect of the direction infiltration that deviates from oil clearance 7 in the air-flow of two-way, another road is then played and is prevented that outside steam etc. from invading the coupling shaft support mechanism 4 of coupling shaft support mechanism 4(right-hand member) effect.

The technological points of the technological scheme that provides as the utility model: on coupling shaft 6 and being positioned at aforesaid stuffing box gland, cooperate section 63 to cooperate the endface position of an end of section 62 to consist of towards bearing housing to have one to be projected on the disc 61 that stuffing box gland cooperates the surface of section 63, this disc 61 gets rid of oil groove 611 with the bearing housing section of cooperation 62 formation between the end face of an end of stuffing box gland cooperation section 63, corresponding with aforesaid oil clearance 7, namely match with oil clearance 7.Aforesaid bearing shell chamber 423 and bearing housing cooperate that formed matching gap communicates with getting rid of oil groove 611 between the surface of section 62, see also arrow shown in Figure 2.

Preferably, aforesaid disc 61 is the shape of circular cone stage body, and the stub end of this circular cone stage body is towards getting rid of oil groove 611.Under the High Rotation Speed of the coupling shaft 6 that the impeller with turbo-expander is in transmission connection, one is formed in disc 61 High Rotation Speed thereupon on the coupling shaft 6, the lubricant oil of attempt towards the direction infiltration of packing holder 5 is got rid of into getting rid of oil groove 611, entered in the sleeve chamber 11 through drawing oilhole 17 by oil clearance 7.Hence one can see that, be used for the bearing housing 41 lubricated lubricant oil that namely bearing shell 42 and bearing housing cooperates section 62 lubricated can not permeated towards the end that leans out the airtight big envelope 52 of obstruction of coupling shaft 6, play the technique effect described in the superincumbent technique effect of the claimant hurdle, and objectively remedied the shortcoming in the prior art.

Application examples:

See also Fig. 3, the spiral case flange plate 81 of the spiral case 8 of turbo-expander shown in this figure is fixedly connected with left flange plate 2 by bolt 221 with spiral case flange plate 81, and the left end of coupling shaft 6 is fixedly connected with impeller in the spiral case 8; , so make up and make the external work of decompressor be able to be absorbed by pressure-increasing machine 92 by external work output connector of the present utility model corresponding to the position of the right flange plate fixed hole 32 of right flange plate 3 is fixedly connected with pressure-increasing machine flange plate 921 as the pressure-increasing machine 92 that connects equipment 9 by the 4th screw 321.In the time pressure-increasing machine 92 will being replaced into illustrated generator 91, blower 93 or other similarly machinery is such as water pump, oil brake etc., reason is the same so

Claims

1. A kind of connecting axle structure of external work output connector of turbo-expander, the external work output connector of described turbo-expander comprise having the coupling sleeve (1) that sleeve chamber (11) and the middle position at two ends respectively offer a coupling shaft support mechanism chamber (12); One is fixed on a left end and left flange plate (2) offer left packing holder chamber (21) at middle position of coupling sleeve (1); One is fixed on right-hand member and the right flange plate (3) offer right packing holder chamber (31) at middle position of coupling sleeve (1); A pair of coupling shaft support mechanism (4), one of them coupling shaft support mechanism (4) is arranged in the described coupling shaft support mechanism chamber (12) of coupling sleeve (1) left end, and another then is arranged in the coupling shaft support mechanism chamber (12) of right-hand member; A pair of packing holder (5), one of them packing holder (5) are arranged in the described left packing holder chamber (21), and another then is arranged in the described right packing holder chamber (31); Described connecting axle structure comprise two ends be bearing in rotationally on the coupling shaft support mechanism (4) be sealed and matched with packing holder (5) and lean out packing holder (5) and the middle part is positioned at a coupling shaft (6) in sleeve chamber (11), wherein: and two ends that be positioned at coupling sleeve (1) upper at described coupling sleeve (1) respectively offer an inlet hole (13), each inlet hole (13) has an intake duct (131) that extends towards the direction of described packing holder (5), and two ends that equally be positioned at coupling sleeve (1) upper at coupling sleeve (1) respectively offer a return-air hole (14), each return-air hole (14) has the return-air road (141) that extends towards the direction of packing holder (5), advance, return-air hole (13,14) be separated by 180 ° around the circumferencial direction of coupling sleeve (1) each other, two ends at coupling sleeve (1) also respectively offer an oil inlet hole (15), each oil inlet hole (15) has an oil input channel (151) that extends towards the direction of described coupling shaft support mechanism (4), and under coupling sleeve (1) the use state towards under a side offer a spill port (16) that communicates with sleeve chamber (11), there is a lubricant oil that is used for to introduce outflow in described coupling shaft support mechanism (4) and the matching gap between coupling shaft support mechanism (4) and described coupling shaft (6) by described oil input channel (151) on being opened in coupling sleeve (1), to draw oil clearance (7) in oilhole (17) the introducing sleeve chamber (11) consisting of between described coupling shaft support mechanism (4) and the described packing holder (5), each formation of the two ends of described coupling shaft (6) has a diameter to cooperate section (62) and diameter to cooperate the stuffing box gland cooperation section (63) of the diameter of section (62) less than described bearing housing less than the bearing housing of the diameter at the middle part of coupling shaft (1), bearing housing cooperates section (62) and described coupling shaft support mechanism (4) to be rotatably assorted, and stuffing box gland cooperates section (63) and described packing holder (5) to be sealed and matched, it is characterized in that: upper and cooperate section (63) to cooperate the endface position of an end of section (62) to consist of towards described bearing housing to have and be projected on the disc (61) that stuffing box gland cooperates the surface of section (63) being positioned at described stuffing box gland at described coupling shaft (6), this disc (61) and the described bearing housing section of cooperation (62) towards stuffing box gland cooperate section (63) the end face of an end between consist of and get rid of oil groove (611), it is corresponding with described oil clearance (7) that this gets rid of oil groove (611).

2. The connecting axle structure of the external work output connector of turbo-expander according to claim 1 is characterized in that described disc (61) is the shape of circular cone stage body, and the stub end of this circular cone stage body is towards the described oil groove (611) that gets rid of.

3. The connecting axle structure of the external work output connector of turbo-expander according to claim 1, it is characterized in that described a pair of coupling shaft support mechanism (4) respectively comprises bearing housing (41), one group of bearing shell (42), in, outer block plate (43,44) and snap ring (45), bearing housing (41) is fixed in the described coupling shaft support mechanism chamber (12), this bearing housing (41) has a bearing shell mating cavity (411), in this bearing shell mating cavity (411) and around the circumferencial direction of bearing shell mating cavity (411), offer the bearing shell supporting foot groove (4111) that equates with the quantity of described one group of bearing shell (42), adjacent bearing shell supporting foot groove (4111) among offers an oil-feed through hole (4112), each oil-feed through hole (4112) communicates with oil groove (412) on being opened in bearing housing (41), towards the side formation of interior block plate (43) an interior block plate chamber (413) is arranged at bearing housing (41), and bearing housing (41) outward a side of block plate (44) consist of an outer block plate chamber (414) and an annular groove (415) arranged, annular groove (415) is positioned at the outside in outer block plate chamber (414), one group of bearing shell (42) is arranged in the described bearing shell mating cavity (411), each bearing shell (42) consists of towards a side of the chamber wall of bearing shell mating cavity (411) and along the length direction of bearing shell (42) a bearing shell supporting foot (421) that is projected on the surface of bearing shell (42), bearing shell supporting foot (421) matches with described bearing shell supporting foot groove (4111), maintain bearing shell space (422) between the adjacent bearing shell (42), bearing shell space (422) communicates with described oil-feed through hole (4112), interior block plate (43) matches with described interior block plate chamber (413), outer block plate (44) is arranged in the described outer block plate chamber (414), snap ring (45) holding is in annular groove (415), externally block plate (44) stops, match in the bearing shell chamber (423) that the bearing housing of described coupling shaft (6) cooperates section (62) to consist of with being enclosed each other by one group of bearing shell (42), described oil input channel (151) communicates with described oil groove (412), and bearing shell chamber (423) and bearing housing cooperate that formed matching gap communicates with the described oil groove (611) that gets rid of between the surface of section (62).

4. according to claim 1, wherein the external work turboexpander output connecting means connecting shaft, characterized in that said pair of seal seat (5) and a central location rejection toward the oil pan (61) embedded in the side of the rejection of the oil has a disc (61) affixed in contact for preventing the oil away from said oil toward the gap (7) in the direction of penetration and cap placed on the the connecting shaft (6) on the oil barrier gland (51), the other side of the insert has a means for preventing the outside air into said connecting shaft support means (4) and the same set of set of the connecting shaft (6) tight barrier on the envelope (52), in each ring seat (5) is also opened with a said inlet (131) for communicating from the inlet (131) of pressurized air directed to the said barrier oil glands (51) and drag airtight envelope (52) seal the space between the inlet seat (53), and also the creation of a channel with said return air (141) connected to is used to isolate the oil seal sleeve (51) and drag airtight envelope (52) between the air pressure within the gap to the return air channel lead (141) of the seal seat outlet channel (54).

5. The connecting axle structure of the external work output connector of turbo-expander according to claim 1, it is characterized in that on the sidewall of the circumferencial direction of described packing holder (5), being arranged with one group of seal ring (55) with the interval state, wherein: the chamber wall that is positioned at seal ring (55) and left packing holder chamber (21) on the packing holder (5) in described left packing holder chamber (21) consists of sealing, and the chamber wall that is positioned at seal ring (55) and right packing holder chamber (31) on the packing holder (5) in described right packing holder chamber (31) forms and seals