CN105927281A - Air inlet and outlet structure of single screw expander - Google Patents
Air inlet and outlet structure of single screw expander Download PDFInfo
- Publication number
- CN105927281A CN105927281A CN201610349773.XA CN201610349773A CN105927281A CN 105927281 A CN105927281 A CN 105927281A CN 201610349773 A CN201610349773 A CN 201610349773A CN 105927281 A CN105927281 A CN 105927281A
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- screw
- air inlet
- screw rotor
- face
- rotor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
- F01C21/18—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
The invention discloses an air inlet and outlet structure of a single screw expander. With the midperpendicular of star wheels and a screw rotor being a reference, a spiral groove in an air inlet segment of the screw rotor is cut off, the axial length of the spiral groove is L1p, the length of a spiral groove in an air outlet segment of the screw rotor is kept complete, an axial air inlet is formed in an enclosure corresponding to the cross section of the air inlet segment of the screw rotor, and a radial air outlet is formed in an enclosure of the air outlet segment. The radial air inlet in the enclosure is changed into the axial air inlet in the enclosure of a screw air inlet end face, and therefore the resistance of centrifugal force to inlet airflow is eliminated. The adaptation screw air inlet end is improved, the spiral groove in the screw air outlet end is kept complete, the radial air outlet is arranged, the hindering effect of the centrifugal force caused by screw rotation to air intake and exhaust is reduced or eliminated, the air intake resistance and the exhaust resistance of the expander are reduced, and the overall efficiency is improved.
Description
Technical field
The invention belongs to mechanical design field, particularly relate to the port mouth structure of a kind of single-screw expander.
Background technology
Screw expander relies on drive of high-pressure gas, and in decompressor, after high pressure gas expansion, drive rotor rotates, and output,
Realization converts heat energy into mechanical energy.The application of screw expander, it will promote the low-grade exhaust heat in industrial flow, geothermal energy and
The recovery of solar energy homenergic, and be converted to electric energy, alleviate energy shortage and problem of environmental pollution.
Single-screw expander is the one of screw expander.Comparing with twin-screw expander, single-screw expander does not also have commercialization to answer
With.Reason is, current single-screw expander both is from the single screw compressor of simple transformation: will single screw compressor
Vent ports is transformed into the air inlet of decompressor, and the air inlet of compressor is transformed into the air vent of decompressor.This do not change machine
Internal structure, only will enter row, gas opening exchange, and reversion compressor becomes the mode of decompressor and is not appropriate for single-screw expander,
The efficiency making single-screw expander is reduced.
The main machine structure of single screw compressor is as it is shown in figure 1, its core component is a screw rod 4, and two therewith in center pair
Claim the star-wheel 2 arranged；Star-wheel 2 is arranged on star-wheel support 3.Star-wheel tooth, teeth groove and casing 5 form compression chamber, and motor passes through
Screw rod 4 drives star-wheel 2 to rotate, it is achieved air-breathing, compression and exhaust process (label 1 is rotor exhaust steam end).
The matching relationship of single screw compressor star-wheel screw rod is as shown in Figure 2.Dotted line in the position of triangle vent ports 10 such as Fig. 2
Shown in triangle, the relevant position being arranged in casing.The direction of rotation of screw rod 8 as shown in arrow 9 in figure, about driving two
Star-wheel 6,7 rotates.Air inlet flows to as shown in arrow 11, flows into screw rod teeth groove to the angular cut of screw rod air inlet.In exhaust process,
Being discharged by this triangle vent ports 10 from the radial direction of screw rod by compressed gas, aerofluxus flows to as shown in figure arrow 12.
At present, in single-screw expander screw rod and star-wheel relative to position as it is shown on figure 3, in figure arrow 17 be rotating of screw rod 15
Direction, about driving, two star-wheels 13,14 rotate.In figure, broken line triangle 16 is the triangle inlet channel of decompressor, arrow
18 is the airflow direction of air inlet.The discharge directions of decompressor is as shown in arrow 19 in figure.In decompressor, the flow direction of fluid is just
Contrary with the gas flow direction in compressor.Expanding gas need to enter expansion chamber from this triangular orifice.Due to expanding gas
Flow direction needs the centrifugal force overcoming screw motion to cause could enter expansion chamber, causes the flow resistance of fluid to increase；Due to this
Resistance is directly proportional to the density of fluid, resistance can be caused to be greatly increased containing liquid, thus more drop before entering expansion chamber in fluid
Low bulk engine efficiency；For ensureing that this resistance does not increases, generally enter expansion chamber at expanding gas, and expansion chamber rotates with screw rod and departs from
Just spraying into liquid (such as lubricating oil) after this triangular orifice to seal, this caused before expansion chamber departs from triangular orifice big
The gas leakage of amount, reduces the efficiency of decompressor.
In prior art, the screw rod 20 of single-screw expander and the size relationship of star-wheel 21, as shown in Figure 4.Screw rod 20 and star
The centre-to-centre spacing of wheel 21 is A, a diameter of d1 of screw rod, a diameter of d2 of star-wheel.By star-wheel, screw shaft perpendicular bisector on the basis of,
The screw channel axial length of screw rod inlet end is L1, and the screw channel axial length of exhaust end is L2.The length of L1 is represented by:
L2 is then less than L1, usual L2=(0.6～0.8) L1.
The induction port of above-mentioned single-screw expander is opened in radially, and the inflow direction of charge air flow is caused by because screw rod rotates with it
Centrifugal force in opposite direction, cause intake resistance to increase.
Summary of the invention
It is an object of the invention to provide the port mouth structure of a kind of single-screw expander, be reduced or eliminated screw rod rotate cause
The centrifugal force inhibition to intake and exhaust, reduce the inlet and outlet resistance of decompressor, improve overall efficiency.
To achieve these goals, the present invention adopts the following technical scheme that
A kind of port mouth structure of single-screw expander, on the basis of the perpendicular bisector of star-wheel and screw rotor, screw rotor
The screw channel of air inlet section blocks, and the air inlet section axial length of the screw rotor after blocking is L1p, and the screw channel of the exhaust section of screw rotor is long
Degree keeps complete, is provided with axial admission aperture, in the casing of exhaust section in the casing that the cross section of the air inlet section of screw rotor is corresponding
On be provided with rod radial air vent mouth；Screw channel axial length L 1p of screw rotor air inlet section is:
Wherein, d1 is the diameter of screw rotor, and d2 is the star-wheel diameter engaged with screw rotor, and A is that the axis of screw rotor arrives
The vertical dimension of star-wheel axis.
Further, the cross section of the air inlet section of screw rotor is the air inlet end face of screw rotor, and the air inlet of screw rotor is arranged at spiral shell
On the air inlet end face of bar rotor；The air vent of screw rotor is arranged on the side of screw rotor.
Further, axial along screw rotor, at the air inlet end face of screw rotor it can be seen that the teeth groove of screw rotor；Turn at screw rod
The aerofluxus end face of son can not see the teeth groove of screw rotor.
Further, the inboard boundary of induction port overlaps in the bottom boundaries of air inlet end face with the teeth groove of screw rotor；Induction port
Rear side border is h with the spacing of the divisional plane of decompressor；The outer side edges boundary line of induction port overlaps with the border line of screw rotor；
The border, front side of induction port is identical at the rear side section line molded line of air inlet end face with teeth groove, is rear side section at the end of teeth groove just air inlet
Upper thread location.
Further, the inboard boundary of induction port overlaps in the bottom boundaries of air inlet end face with the teeth groove of screw rotor；Induction port
Rear side border is h with the spacing of the divisional plane of decompressor；The outer side edges boundary line of induction port overlaps with the border line of screw rotor；
The border, front side of induction port is straight line or curve, and its position and teeth groove overlap or not at the rear side section line molded line of air inlet end face
Overlap.
Further, h is more than zero.
Further, in the casing that screw rotor inlet end face is corresponding, in addition to induction port, axis hole, be provided with sealing plane and
Star-wheel space, this sealing plane coordinates guarantee to seal with screw rotor air inlet end face；Star-wheel space is used for installing star-wheel.
Further, the border of vent ports is identical with the front side edge boundary line molded line of the teeth groove outer rim of screw rotor.
Further, the border of vent ports is straight line or curve, the front side edge boundary line type of the teeth groove outer rim of its position and screw rotor
Line overlaps or misaligned.
Further, in casing, centrosymmetry is provided with two axial admission apertures；In casing, centrosymmetry is provided with two radially rows
Gas opening.
Relative to prior art, the method have the advantages that
In the present invention, the induction port of decompressor is opened in the air inlet end face of screw rotor, charge air flow by screw rod rotate cause from
The impact of mental and physical efforts, ensures to seal such that it is able to be mixed into liquid (including lubricating oil) in charge air flow, it is also possible to be used for by decompressor
Biphase expansion, and maintain less intake resistance.It is finally reached the purpose improving efficiency of expander.
Accompanying drawing explanation
Fig. 1 is single screw compressor basic block diagram；
Fig. 2 is single helical-lobe compressor intermeshing pair screw rod and the coordinating and movement relation schematic diagram of star-wheel；
Fig. 3 is existing single-screw expander Meshing Pair screw rod and the coordinating and movement relation schematic diagram of star-wheel；
Fig. 4 is size and the matching relationship schematic diagram of existing single-screw expander screw rod and star-wheel；
Fig. 5 is the relative position relation schematic diagram of single-screw expander star-wheel of the present invention and screw rod；
Fig. 6 is the air inlet end view of screw rod of the present invention；
Fig. 7 is the perspective view on screw rod air inlet end face of the vent ports in casing of the present invention；
Fig. 8 is casing corresponding to the screw rod inlet end face of the present invention perspective view at screw rod air inlet end face；
Fig. 9 is the perspective view on screw rod top view of the rod radial air vent mouth border in casing of the present invention.
Detailed description of the invention
The axial admission aperture in screw rod air inlet end face casing is made in radial air inlet aperture in casing by the present invention, eliminates off mental and physical efforts pair
The resistance of charge air flow.Improvement to adaptation screw rod inlet end, the screw channel of screw rod exhaust end keeps complete, and arranges rod radial air vent
Mouthful.
Referring to shown in Fig. 5, the port mouth structure of a kind of single-screw expander of the present invention, with star-wheel 21, the axle of screw rod 20
Perpendicular bisector on the basis of, the screw channel of screw rod inlet end clips one section, and inlet end screw channel axial length is changed into L1p by L1, and spiral shell
Bar exhaust end screw channel then keeps complete, its axial length L 2p=L1.L1p=(0.5～0.95) L1.Concrete numerical value is according to aerofluxus
Amount is selected.
Screw rod inlet end is as shown in Figure 6.In terms of inlet end view, the rotation direction of main shaft 23 is as shown in figure arrow 26, and end face can
To see teeth groove 22, on front side of teeth groove, section line is as shown in the reference numeral 24, and on rear side of teeth groove, section line is as shown in figure grade 25, and bottom land cuts
Upper thread is as shown in the reference numeral 28.Along with screw rod inlet end length L1p diminishes, the capacity of decompressor diminishes, bottom land section line place
The radius of circle also will diminish.
The inlet channel of decompressor is opened in the ground plane coordinated with screw rod air inlet end face, and induction port 29 is at screw rod inlet end
The projection in face is as shown in Fig. 7 shadow region.Because a screw rod and two star-wheels are centrosymmetric layout, expansion chamber is also on screw rod
Symmetrical, so in the symmetric position of screw rod air inlet end face, being disposed with an identical induction port 30.Induction port 29
Inboard boundary 35 overlap with screw slot bottom boundaries 28.The rear side border 33 of induction port 29 and the divisional plane 34 (spiral shell of decompressor
Bar is at centrage place horizontal plane) spacing be h.This distance is identical with casing thickness or close.The outside of induction port 29
Boundary line 31 overlaps with the border line 27 of screw rod.The border, front side 32 of induction port 29 is cut at the rear side in inlet end cross section with teeth groove
Upper thread 25 molded line is identical, is rear side section line 25 location at the end of teeth groove just air inlet.The size of induction port 29 by
On front side of it, border 32 determines.Front side border 32 from rear side border 33 more away from, induction port 29 is the biggest, and air inflow is the biggest, expand
The expansion ratio of machine is the least.The position on border 32, front side determines according to expansion ratio.
Other region outside axis hole and induction port position, casing is provided with planar end and coordinates with the air inlet end face of screw rod,
Seal, beat the region 36 of hatching as shown in Figure 8.Region 37,38 is the reserved star-wheel space in casing.For protecting
The capacity of card decompressor, region 37 and 38 should be the narrowest, only needs to be loaded by star-wheel.
For adapting to induction port, the exhaust end of screw rod keeps screw channel complete, and the vent ports of decompressor is arranged in the footpath of casing
To direction.On the view of the screw rod that border 40 projectable of this rod radial air vent mouth is made to direction shown in arrow 39 along Fig. 8,
As shown in Figure 9.In casing, it is disposed as vent ports from all regions, this side on the border 40 of vent ports to screw rod exhaust end.
Because of the symmetrical configuration of single-screw expander, the symmetric position in casing is additionally provided with an identical vent ports.This vent ports
Border 40 is identical with front side edge boundary line 41 molded line of screw rod teeth groove outer rim, and the position on the border 40 of vent ports is that teeth groove is in just
(in Fig. 9, label 42 is the rear side border of screw rod teeth groove outer rim to expand moment teeth groove front side edge boundary line 41 location the most completely
Line, label 43 is screw rod direction of rotation).
The present invention uses such scheme, and the induction port of decompressor is opened in the air inlet end face of screw rod, and charge air flow is not rotated by screw rod
The impact of the centrifugal force caused, ensures to seal such that it is able to be mixed into liquid (including lubricating oil) in charge air flow, it is also possible to by swollen
Swollen machine is used for biphase expansion, and maintains less intake resistance.It is finally reached the purpose improving efficiency of expander.
Claims (9)
1. the port mouth structure of a single-screw expander, it is characterised in that with the perpendicular bisector of star-wheel and screw rotor as base
Standard, the screw channel of the air inlet section of screw rotor blocks, and the air inlet section axial length of the screw rotor after blocking is L1p, screw rotor
The screw channel length of exhaust section keeps complete, is provided with axial admission aperture in the casing that the cross section of the air inlet section of screw rotor is corresponding,
The casing of exhaust section is provided with rod radial air vent mouth；Screw channel axial length L 1p of screw rotor air inlet section is:
Wherein, d1 is the diameter of screw rotor, and d2 is the star-wheel diameter engaged with screw rotor, and A is that the axis of screw rotor arrives
The vertical dimension of star-wheel axis.
The port mouth structure of a kind of single-screw expander the most according to claim 1, it is characterised in that screw rotor
The air inlet end face that cross section is screw rotor of air inlet section, the air inlet of screw rotor is arranged on the air inlet end face of screw rotor；Spiral shell
The air vent of bar rotor is arranged on the side of screw rotor.
The port mouth structure of a kind of single-screw expander the most according to claim 1, it is characterised in that induction port
Inboard boundary overlap in the bottom boundaries of air inlet end face with the teeth groove of screw rotor；The rear side border of induction port and the segmentation of decompressor
The spacing in face is h；The outer side edges boundary line of induction port overlaps with the border line of screw rotor；The border, front side of induction port and tooth
Groove is identical at the rear side section line molded line of air inlet end face, is rear side section line location at the end of teeth groove just air inlet.
The port mouth structure of a kind of single-screw expander the most according to claim 1, it is characterised in that induction port
Inboard boundary overlap in the bottom boundaries of air inlet end face with the teeth groove of screw rotor；The rear side border of induction port and the segmentation of decompressor
The spacing in face is h；The outer side edges boundary line of induction port overlaps with the border line of screw rotor；The border, front side of induction port is one
Bar straight line or curve, its position overlaps or misaligned at the rear side section line molded line of air inlet end face with teeth groove.
5. according to the port mouth structure of a kind of single-screw expander described in claim 3 or 4, it is characterised in that h is big
In zero.
The port mouth structure of a kind of single-screw expander the most according to any one of claim 1 to 4, its feature exists
In, in the casing that screw rotor inlet end face is corresponding, in addition to induction port, axis hole, it is provided with sealing plane and star-wheel space,
This sealing plane coordinates guarantee to seal with screw rotor air inlet end face；Star-wheel space is used for installing star-wheel.
The port mouth structure of a kind of single-screw expander the most according to claim 1, it is characterised in that vent ports
Border identical with the front side edge boundary line molded line of the teeth groove outer rim of screw rotor.
The port mouth structure of a kind of single-screw expander the most according to claim 1, it is characterised in that vent ports
Border be straight line or curve, its position overlaps or misaligned with the front side edge boundary line molded line of the teeth groove outer rim of screw rotor.
The port mouth structure of a kind of single-screw expander the most according to claim 1, it is characterised in that in casing
The heart is symmetrically arranged with two axial admission apertures；In casing, centrosymmetry is provided with two rod radial air vent mouths.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610349773.XA CN105927281B (en) | 2016-05-24 | 2016-05-24 | A kind of port mouth structure of single-screw expander |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610349773.XA CN105927281B (en) | 2016-05-24 | 2016-05-24 | A kind of port mouth structure of single-screw expander |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105927281A true CN105927281A (en) | 2016-09-07 |
| CN105927281B CN105927281B (en) | 2018-08-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610349773.XA Active CN105927281B (en) | 2016-05-24 | 2016-05-24 | A kind of port mouth structure of single-screw expander |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2449705A1 (en) * | 1974-10-18 | 1976-04-22 | Omphale Sa | Multi-start worm screw compressor or expansion engine - has sealing gear wheel with tooth flanks on low, longer than on high pressure side |
| US5087182A (en) * | 1989-09-12 | 1992-02-11 | Bernard Zimmern | Casing construction for screw compression/expansion machines |
| CN201284741Y (en) * | 2008-11-07 | 2009-08-05 | 徐道敏 | Meshing structure of single-screw meshing pair |
| CN201461864U (en) * | 2009-06-25 | 2010-05-12 | 上海孚创螺杆技术有限公司 | Single-worm engaging mechanism with reducing generatrix secondary envelope single-worm molded line |
| CN201747600U (en) * | 2010-07-29 | 2011-02-16 | 深圳市亚普精密机械有限公司 | Single-screw compressor with small specific power |
| CN203867621U (en) * | 2014-05-29 | 2014-10-08 | 扬州大学 | Power adjustable single screw rod expansion machine |
-
2016
- 2016-05-24 CN CN201610349773.XA patent/CN105927281B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2449705A1 (en) * | 1974-10-18 | 1976-04-22 | Omphale Sa | Multi-start worm screw compressor or expansion engine - has sealing gear wheel with tooth flanks on low, longer than on high pressure side |
| US5087182A (en) * | 1989-09-12 | 1992-02-11 | Bernard Zimmern | Casing construction for screw compression/expansion machines |
| CN201284741Y (en) * | 2008-11-07 | 2009-08-05 | 徐道敏 | Meshing structure of single-screw meshing pair |
| CN201461864U (en) * | 2009-06-25 | 2010-05-12 | 上海孚创螺杆技术有限公司 | Single-worm engaging mechanism with reducing generatrix secondary envelope single-worm molded line |
| CN201747600U (en) * | 2010-07-29 | 2011-02-16 | 深圳市亚普精密机械有限公司 | Single-screw compressor with small specific power |
| CN203867621U (en) * | 2014-05-29 | 2014-10-08 | 扬州大学 | Power adjustable single screw rod expansion machine |
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| Publication number | Publication date |
|---|---|
| CN105927281B (en) | 2018-08-10 |
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