CN205858670U - Single-screw expander screw channel aerofluxus leaving velocity utilizes system - Google Patents
Single-screw expander screw channel aerofluxus leaving velocity utilizes system Download PDFInfo
- Publication number
- CN205858670U CN205858670U CN201620690609.0U CN201620690609U CN205858670U CN 205858670 U CN205858670 U CN 205858670U CN 201620690609 U CN201620690609 U CN 201620690609U CN 205858670 U CN205858670 U CN 205858670U
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- China
- Prior art keywords
- screw
- screw rod
- expander
- steam vent
- aerofluxus
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- 238000003475 lamination Methods 0.000 claims 1
- 230000002950 deficient Effects 0.000 abstract description 8
- 239000007789 gas Substances 0.000 description 18
- 238000000034 method Methods 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Abstract
Single-screw expander screw channel aerofluxus leaving velocity utilizes system, belongs to field of power machinery.Single-screw expander screw channel aerofluxus leaving velocity utilizes system, casing outside the star-wheel that mates with screw rod including the screw rod of single-screw expander, screw rod and the main shaft being connected with screw rod, it is characterized in that, being provided with at the screw rod tail helicla flute port of export and export the steam vent communicated with helicla flute, the hole that steam vent is set by casing end face in running is connected with the external world.Each steam vent is the corresponding steam vent of each helicla flute, and steam vent is unique passage that gas is discharged in screw channel.Reducing the single-screw expander deficient expansion-loss under big expansion ratio operating mode, be embodied in when real work expansion ratio is more than optimum expansion ratio, along with the increase of expansion ratio, efficiency of expander does not reduces or to reduce speed slower.
Description
Technical field
This utility model relates to a kind of new type single screw decompressor screw channel aerofluxus leaving velocity and utilizes system, it is intended to reduce single screw rod
The deficient expansion-loss of decompressor, belongs to field of power machinery.
Background technology
Common decompressor has two kinds of forms, i.e. speed mode and positive displacement.The operation principle of speed mode is that beneficially jet pipe produces
Raw high velocity air promotes impeller to rotate, and positive-displacement expansion engine to be the volume utilizing some structures to produce change carries out work
Make.Speed mode decompressor is generally used for large-scale (MW level) power output system, and positive-displacement expansion engine is generally used for less rule
The power output system of mould (below 1MW).
Positive-displacement expansion engine mainly has piston type, vortex, single-screw and double-screw type etc., wherein single-screw expander
Being a kind of structure type with clear superiority, major advantage has: do not have unbalance mass, and screw rod bears any hardly
Axial force and radial force, only star-wheel bear less gas force.Therefore single-screw expander rotates more steady, vibrates and makes an uproar
Sound is less, and bearing life is long.Common single screw-rod structure configures as it is shown in figure 1, its swept volume is screw rod conduit.Star-wheel
Screw channel is divided into two parts, and along with main shaft rotates, every part screw channel volume the most periodically changes, and gases at high pressure enter spiral shell
Increase with screw channel volume after groove and expand, corresponding gas force lead-screw rotating output shaft merit.
Single-screw expander is generally of fixing interior volume specific ratio.Immobilized substance amasss the decompressor of ratio and there may be deficient expansion
Or cross expansion issues.Cross expansion and refer to that when expansion process ends, in screw channel, gas has expanded to a certain pressure lower than pressure at expulsion
Power, now in exhaustor, gas is back to rapidly screw channel through steam vent, and in making screw channel, gas pressure increases, and consumes a part of swollen
Swollen merit, makes expander exhaust gas promote merit to increase simultaneously, caused expansion-loss.Gas in screw channel when deficient expansion refers to expand end of a period
Pressure is still greater than pressure at expulsion, when vent ports is opened, and one without hindrance expansion process rapid decompression of gas experience in element volume
To pressure at expulsion, cause deficient expansion-loss.
The screw channel vent ports (being equivalent to the induction port of single screw compressor) of single-screw expander is usually located at casing
On, it being embodied in casing and the breach on screw rod matching surface, typical structure is as shown in Figure 2.In exhaust process, screw channel
Interior gas radially flows out screw channel along screw rod, and this outflow process does not produce any shaft work.
Utility model content
The single-screw expander that the utility model proposes, utilizes system for having single-screw expander screw channel aerofluxus leaving velocity
Structure is as shown in Figure 3.
Single-screw expander screw channel aerofluxus leaving velocity utilizes system, mates with screw rod including the screw rod of single-screw expander
Casing outside star-wheel, screw rod and the main shaft being connected with screw rod, it is characterised in that be provided with at the screw rod tail helicla flute port of export
Export the steam vent communicated with helicla flute, the hole that steam vent is set by casing end face in running is connected with the external world.Each
Steam vent is the corresponding steam vent of each helicla flute, and steam vent is unique passage that gas is discharged in screw channel.The most excellent
Choosing, the screw thread of screw rod tail end face uses the structure of chamfering.
This structure is compared with structure shown in Fig. 2, has 2 differences:
(1) not used for the breach of radial direction aerofluxus in casing；
(2) there is breach in screw rod tail (referring to low-pressure side, lower same).
Using the single-screw expander of said structure, in screw channel, gas is discharged and trailing space can only be relied on to carry out.Pass through tail
During portion's steam vent aerofluxus, under deficient expansion operating mode, due to round open area little (for relatively with pressure self-expanding), and aerofluxus is opened
During the beginning, in screw channel, pressure is apparently higher than pressure at expulsion, and gas exists obvious decompressing speed-increasing process, screw channel when flowing through vent ports
Inner high voltage gas flows out at a high speed screw channel, and the counteracting force that gas flows out can rotate with lead-screw, produces certain shaft work, and this is suitable
In reclaiming a part of pressure potential, reduce deficient expansion-loss.By above means, single-screw expander has actually become one
Individual quasi-compound expansion machine.Under little expansion ratio operating mode, the volume change relying on single screw-rod structure to produce carrys out work.In big expansion ratio
Under operating mode, screw rod tail steam vent has actually become " nozzle " of speed mode decompressor, and spiral shell rib is " blade ", is made up of the two
Second level speed mode decompressor.This compound expansion machine first with the volume change that single screw-rod structure produces be expanded to a certain in
Between pressure, rely on " utilization of screw channel aerofluxus leaving velocity " speed mode decompressor of being formed to carry out work from intermediate pressure to pressure at expulsion
Make.
In addition, partial high pressure gas crosses star-wheel when leaking out screw channel, also flows out screw channel from above-mentioned steam vent, has equally
There is certain acting ability.
Single-screw expander, may be single star wheel structure, it is also possible to for many star wheel structures.
For improving the effect that air-flow lead-screw rotates, screw rod tail structure should be conducive to aerofluxus, screw rod tail steam vent
Opening should make the velocity of aerofluxus may be consistent with screw rod tail spiral shell rib direction.
Benefit of the present utility model is the deficient expansion-loss reducing single-screw expander under big expansion ratio operating mode, specifically
Show as when real work expansion ratio more than optimum expansion ratio time, along with the increase of expansion ratio, efficiency of expander do not reduce or
Reduce speed slower.
Accompanying drawing explanation
Accompanying drawing 1, single-screw expander typical structure schematic diagram；
Accompanying drawing 2, single-screw expander rod radial air vent mouth schematic diagram；
Accompanying drawing 3, the single-screw expander structural representation that the utility model proposes；
Accompanying drawing 4, screw rod tail correction example.
Detailed description of the invention
Below in conjunction with embodiment, this utility model is described further, but this utility model is not limited to following enforcement
Example.
Embodiment 1: implement of the present utility model it is crucial that the position of gas outlet channels and shape in screw channel.First, exist
On single-screw expander housing, no longer offer the breach for radial direction aerofluxus；Meanwhile, cut out accordingly at screw rod tail (low-pressure side)
Exhaust passage.Example 1 provides a kind of simple mode, and i.e. in screw rod tail chamfering (as shown in Figure 4), at this moment screw channel exists scarce
Mouthful, and this breach is unique passage that gas is discharged in each screw channel, during by this channel vent, corresponding speed effect energy
Anti-lead-screw rotates, and reclaims a part of pressure potential.
Claims (5)
1. single-screw expander screw channel aerofluxus leaving velocity utilizes system, the star mated with screw rod including the screw rod of single-screw expander
Casing that wheel, screw rod are outside and the main shaft being connected with screw rod, it is characterised in that be provided with at the screw rod tail helicla flute port of export and
Helicla flute exports the steam vent communicated, and the hole that steam vent is set by casing end face in running is connected with the external world.
2. utilize system according to the single-screw expander screw channel aerofluxus leaving velocity described in claim 1, it is characterised in that each aerofluxus
Hole is the corresponding steam vent of each helicla flute, and steam vent is unique passage that gas is discharged in screw channel.
3. utilize system according to the single-screw expander screw channel aerofluxus leaving velocity described in claim 1, it is characterised in that screw rod tail
The spiral lamination of end face uses the structure of chamfering.
4. utilize system according to the single-screw expander screw channel aerofluxus leaving velocity described in claim 1, it is characterised in that screw rod tail
The opening of steam vent should make the velocity of aerofluxus may be consistent with screw rod tail spiral shell rib direction.
5. utilize system according to the single-screw expander screw channel aerofluxus leaving velocity described in claim 1, it is characterised in that single screw rod is swollen
Swollen machine is single star wheel structure or many star wheel structures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620690609.0U CN205858670U (en) | 2016-07-01 | 2016-07-01 | Single-screw expander screw channel aerofluxus leaving velocity utilizes system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620690609.0U CN205858670U (en) | 2016-07-01 | 2016-07-01 | Single-screw expander screw channel aerofluxus leaving velocity utilizes system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205858670U true CN205858670U (en) | 2017-01-04 |
Family
ID=57645323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620690609.0U Expired - Fee Related CN205858670U (en) | 2016-07-01 | 2016-07-01 | Single-screw expander screw channel aerofluxus leaving velocity utilizes system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205858670U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105952640A (en) * | 2016-07-01 | 2016-09-21 | 北京工业大学 | Utilization system for exhaust leaving velocity of spiral grooves of single-screw expansion machine |
-
2016
- 2016-07-01 CN CN201620690609.0U patent/CN205858670U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105952640A (en) * | 2016-07-01 | 2016-09-21 | 北京工业大学 | Utilization system for exhaust leaving velocity of spiral grooves of single-screw expansion machine |
| CN105952640B (en) * | 2016-07-01 | 2018-09-04 | 北京工业大学 | Single-screw expander screw channel is vented leaving velocity and utilizes system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170104 Termination date: 20200701 |