CN209370164U - A kind of adjustment structure of the air intake duct of centrifugal compressor and impeller concentricity - Google Patents
A kind of adjustment structure of the air intake duct of centrifugal compressor and impeller concentricity Download PDFInfo
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- CN209370164U CN209370164U CN201821253060.4U CN201821253060U CN209370164U CN 209370164 U CN209370164 U CN 209370164U CN 201821253060 U CN201821253060 U CN 201821253060U CN 209370164 U CN209370164 U CN 209370164U
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- air intake
- intake duct
- impeller
- spiral case
- slide body
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Abstract
The utility model discloses the adjustment structures of a kind of air intake duct of centrifugal compressor and impeller concentricity, including impeller, air intake duct, spiral case, shaft and casing, the spiral case is fixed on casing, air intake duct is set on the inside of spiral case, shaft rotation is set in casing, and the top of shaft stretches in air intake duct and is fixedly connected with impeller, it is uniformly distributed between the air intake duct and spiral case that there are three Slanted slide block mechanisms, Slanted slide block mechanism is fixed on spiral case, and one end of Slanted slide block mechanism contacts on the outer circle wall of air intake duct.The Parts of Compressor requirement on machining accuracy of the utility model is low, at low cost, and the concentricity of air intake duct and impeller is higher than original version, and the inclined-plane+screw thread double self locking method of the utility model is convenient and reliable.Blade tip air loss using the centrifugal impeller of the utility model structure is low, and hydraulic efficiency is high.
Description
Technical field:
The utility model relates to the adjustment structures of a kind of air intake duct of centrifugal compressor and impeller concentricity.
Background technique:
In centrifugal compressor, the important parameter of gap size one influence fan performance of air intake duct and impeller.Into
The gap of air flue and impeller influences fan efficiency and safety, and gap is restricted by concentricity.
The impeller of centrifugal compressor is generally conical shape, is mounted in the flared cavity of air intake duct end.Air intake duct with
The selection of the gap size of impeller usually requires to consider following two influence factor:
1) centrifugal impeller high speed rotation when compressor operating, and air intake duct is stationary.The blade of centrifugal impeller at this time
The relative velocity on tip and air intake duct surface can achieve 200m/s or more.Once grazing occurs for part at this time, leaf will be damaged
Wheel, catching fire, the serious safety accident that impeller explosion even occurs.It is big by one as far as possible that therefore, it is desirable to the gaps of impeller and air intake duct
A bit to ensure safety.
2) at the same time, in order to reduce the blade tip air loss of impeller blade when compressor operating, the leaf of centrifugal impeller
Distance of the piece apart from air intake duct surface needs as small as possible.Usually only 0.5~1.0mm or so in air blower, and compressor
In often only have 0.3~0.5mm it is even more small.
Air intake duct and above-mentioned two performance requirement of impeller clearance are conflicting: for safety, gap being needed to the greatest extent may be used
It can be big；For hydraulic efficiency height, need gap as small as possible.
So in order to meet the two contradictory performance requirements simultaneously, it is necessary to accomplish:
1) guarantee the concentricity of air intake duct and impeller as far as possible in the allowed band of processing and assembly precision, so that it is guaranteed that
Gap it is uniform.
2) according to the concentricity precision of air intake duct and impeller, the minimum safe gap of air intake duct and impeller is determined.That is: minimum
Safety clearance > air intake duct roundness tolerance value+impeller roundness tolerance+concentricity tolerance.
Obviously, common processing method is easy to control the roundness tolerance of air intake duct and impeller within 0.02mm, but
Concentricity tolerance is more difficult to control.Because there is no direct assembly relations for impeller and air intake duct, but by one very long
Assembly chain guarantee.This assembly chain first and last part between tolerance depend on all fit tolerances random value it
With.
In general centrifugal compressor, relatively common assembly chain is: impeller and shaft fit tolerance, shaft straight line
Degree, shaft and bearing inner race fit tolerance, bearing internal external circle clearance, bearing outer ring and bearing block (on casing) fit tolerance,
Casing inside and outside circle concentricity, casing and spiral case fit tolerance, spiral case inside and outside circle concentricity, spiral case and air intake duct fit tolerance, into
Air flue inside and outside circle concentricity.
One shares 10 assembly/machining tolerances in this assembly chain.Assuming that each tolerance is ± 0.02, then most laggard
The concentricity value of air flue and impeller will be the normal distribution in ± 0.2 range.When i.e. impeller operates in air intake duct, gap
The smallest side in maximum side and gap, gap size difference are possible to reach the degree of 0.4mm.
This is why the air intake duct of most of centrifugal compressors and impeller clearance are all in the reason of 0.5mm or more.And
Usual air intake duct and the every increase 0.1mm in impeller clearance, the hydraulic efficiency of compressor will decline 2% or so.Therefore 0.5~
The gap of 1.0mm means that therefore the compressor can lose the electric energy close to 10%~20%.
In conclusion what air intake duct was difficult to ensure compared with when the concentricity of impeller only leans on the tolerance fit of part, therefore
In order to make process and assemble cost excessively not high, a part of efficiency can only be sacrificed.
But if the concentricity of air intake duct and impeller can be adjusted again after the assembly is completed in blower, so that it may substantially reduce zero
The tolerance of part simplifies assembly technology, while need not sacrifice the efficiency of blower.
Utility model content:
The utility model is to provide a kind of air inlet of centrifugal compressor to solve the above-mentioned problems of the prior art
The adjustment structure in road and impeller concentricity.
Technical solution used by the utility model has: a kind of adjusting of the air intake duct of centrifugal compressor and impeller concentricity
Structure, including impeller, air intake duct, spiral case, shaft and casing, the spiral case are fixed on casing, and air intake duct is set on the inside of spiral case,
Shaft rotation is set in casing, and the top of shaft stretches in air intake duct and is fixedly connected with impeller, the air intake duct and spiral case
Between it is uniformly distributed there are three Slanted slide block mechanisms, Slanted slide block mechanism is fixed on spiral case, and one end of Slanted slide block mechanism contacts at air inlet
On the outer circle wall in road；
The Slanted slide block mechanism includes that oblique sliding rail, slide body, adjusting screw and helical spring, the oblique sliding rail are fixedly connected
On spiral case, slide body is slidably connected on oblique sliding rail, is adjusted screw and is passed through slide body and be threaded on oblique sliding rail, spiral
Spring pocket, which is set to, to be adjusted on screw, and the bottom end of helical spring contacts on oblique sliding rail, and top contacts on slide body, spiral bullet
Slide body is contacted at and is adjusted on screw by spring, and thrust inclined-plane is equipped on slide body, which contacts at the outer of air intake duct
In circumferential wall.
Further, thrust slot there are three setting on the outer circle wall of the air intake duct, the thrust inclined-plane of slide body contacts at
In thrust slot.
Further, the width of the thrust slot is greater than the width of slide body.
Further, the oblique sliding rail is equipped with mounting hole, and the bottom of the mounting hole is equipped with threaded hole, mounting hole and screw thread
Hole coaxial arrangement, and be both arranged along the glide direction of slide body, helical spring is placed in mounting hole, adjusts screw thread
It is connected in threaded hole.
Further, the bottom end of the oblique sliding rail is equipped with fixed feet, and fixed feet is fixed by bolts on spiral case.
Further, it is parallel to each other between the thrust inclined-plane and air intake duct axis.
Further, the angle between the sliding surface between the slide body and oblique sliding rail and thrust inclined-plane is 5-10 °.
The utility model has the following beneficial effects:
1) the Parts of Compressor requirement on machining accuracy of the utility model is low, at low cost.
The air intake duct of the utility model and the concentricity of impeller can be adjusted again after mounting, thus spiral case and casing plus
Work required precision can be very low, and component assembly can also replace tight fit with clearance fit, is processed into so as to substantially reduce
This.
And concentricity adjusting is unable to after original version installation, guarantee completely by the processing of components and assembly precision.Therefore
The heavy parts such as all related components, including casing, spiral case are also required to very high geometric tolerance and assembly precision, cause to process
Cost is surging.
The mating surface of the only sliding friction pair of Slanted slide block mechanism compared with high manufacturing accuracy is needed in the utility model, other
Geometric tolerance does not require.
2) air intake duct of the utility model and the concentricity of impeller are higher than original version.
As previously described, when the processing progress of all correlated parts and cooperation precision all reach (about 5~6 grades of ± 0.02mm
Precision) when, the air intake duct of original version and concentricity fit tolerance >=± 0.2 of impeller.
And in the utility model, the spinning movement for adjusting screw is reduced twice by screw thread and inclined-plane, can achieve very smart
Thin adjusting；And positioning can be improved by reducing the straightforward procedure at the inclination angle of slide body, the screw pitch for reducing adjusting screw
Precision.
Such as when the spanner angular deviation of manual adjustment screw is ± 15 °:
If the inclination angle of slide body is 20 °, the screw pitch of adjusting screw is 1.5mm, screw is adjusted for each revolution, air inlet
Move 0.51mm in road.The degree of regulation of air intake duct theoretically can achieve ± 0.02mm.
If the inclination angle of slide body is 10 °, the screw pitch of adjusting screw is 1mm, the degree of regulation of air intake duct theoretically may be used
To reach ± 0.007mm.The principal element for determining concentricity at this time has been the measurement accuracy of concentricity.
Obviously the air intake duct of the utility model and impeller concentricity are more much higher than original version.
3) inclined-plane of the utility model+screw thread double self locking method is convenient and reliable.
4) the blade tip air loss using the centrifugal impeller of the utility model structure is low, and hydraulic efficiency is high.
Since the concentricity of impeller and air intake duct is preferable, so allow the appropriate gap for reducing blade tip and air intake duct, thus
It reduces blade tip air loss, improve hydraulic efficiency.
As described above, the impeller air intake duct concentricity ± 0.2mm of original version centrifugal compressor, blade tip clearance are logical
Often in 0.5~1.0mm；And concentricity can be down to ± 0.01mm hereinafter, so blade tip clearance can contract in the utility model
It is small to 0.1~0.3mm.
According to the empirical data of fluid design, blade tip clearance is contracted to the flat of this patent from the average 0.75mm of prototype structure
The hydraulic efficiency of centrifugal impeller can be improved 11% or so by equal 0.2mm.11% or so power consumption can be saved.
Detailed description of the invention:
Fig. 1 is the utility model three dimensional sectional view.
Fig. 2 is the utility model top view.
Fig. 3 is the structure chart of Slanted slide block mechanism in the utility model.
Fig. 4 is the longitudinal sectional view of Slanted slide block mechanism in the utility model.
Fig. 5 is the horizontal cross of Slanted slide block mechanism in the utility model.
Specific embodiment:
The utility model will be further described below with reference to the accompanying drawings.
As shown in Figures 1 to 5, the utility model discloses a kind of air intake duct of centrifugal compressor and the adjusting of impeller concentricity
Structure, including impeller 1, air intake duct 2, spiral case 3, shaft 4 and casing 5, spiral case 3 are fixed on casing 5, and air intake duct 2 is set to spiral case 3
Inside, the rotation of shaft 4 are set in casing 5, and the top of shaft 4 stretches in air intake duct 2 and is fixedly connected with impeller 1, air intake duct 2
Uniformly distributed between spiral case 3 there are three Slanted slide block mechanisms 6, and Slanted slide block mechanism 6 is fixed on spiral case 3, and one end of Slanted slide block mechanism 6
It contacts on the outer circle wall of air intake duct 2.
Slanted slide block mechanism 6 includes oblique sliding rail 61, slide body 62, adjusts screw 63 and helical spring 64, and oblique sliding rail 61 is fixed
It is connected on spiral case 3, slide body 62 is slidably connected on oblique sliding rail 61, is adjusted screw 63 and is passed through slide body 62 and be threadedly coupled
On oblique sliding rail 61, helical spring 64, which is sheathed on, to be adjusted on screw 63, and the bottom end of helical spring contacts on oblique sliding rail 61, top
End contacts on slide body 62.Slide body 62 is contacted at and is adjusted on screw 63 by helical spring.Thrust is equipped on slide body 62
Inclined-plane 60, the thrust inclined-plane 60 contact on the outer circle wall of air intake duct 2.
It is inwardly screwed into and adjusts screw 63, just will push slide body 62 along sliding surface slide downward, and pass through slide body 62
On thrust inclined-plane 60 push air intake duct 2 mobile.It loosens outward and adjusts screw 63, slide body 62 will be in helical spring 64
Along sliding surface upward sliding under promotion, thrust inclined-plane 60 is retreated to allow air intake duct mobile.
Thrust slot 21 there are three setting on the outer circle wall of air intake duct 2, the thrust inclined-plane 60 of slide body 62 contacts at thrust
In slot 21.The width of thrust slot 21 is greater than the width of slide body 62, to allow air intake duct 2 to slide along thrust inclined-plane 60 is horizontal.
Oblique sliding rail 61 is equipped with mounting hole 610, and the bottom of the mounting hole 610 is equipped with threaded hole 611, mounting hole 610 and spiral shell
Pit 611 is coaxially disposed, and is both arranged along the glide direction of slide body 62, and helical spring 64 is placed in mounting hole 610,
Screw 63 is adjusted to be threaded in threaded hole 611.
The bottom end of oblique sliding rail 61 is equipped with fixed feet 612, and fixed feet 612 is fixed by bolts on spiral case 3.Three oblique sliding rails
61 are distributed along the axis for axis symmetry of spiral case, and are screwed on spiral case, and the thrust inclined-plane 60 of slide body 62 is directed toward spiral case
Axis.
It is parallel to each other between 2 axis of thrust inclined-plane 60 and air intake duct.Slide body 62 and the tiltedly sliding surface between sliding rail 61 with
The angle on thrust inclined-plane 60 is smaller (5-10 °), therefore has latching characteristics.If slide body 62 is simultaneously without built-in spring
It will not be jacked up upwards by the lateral compression of air intake duct.
The built-in helical spring 64 of Slanted slide block mechanism is the loosening device for adjusting bolt simultaneously, by the compression for keeping screw thread
Power and ensureing bolt will not loosen.Therefore the second self-locking mechanism that bolt is also Slanted slide block mechanism is adjusted.
When the utility model is used, compress a Slanted slide block mechanism 6, while loosening other two Slanted slide block mechanism 6, then by
The air intake duct 2 of clamping will be moved along the thrust direction for being compacted Slanted slide block mechanism 6.
As long as therefore suitably adjusting the thrust inclined-plane 60 of three slide bodies 62, air intake duct will push along radially and circumferentially
It is mobile, it completes after adjusting, is not necessarily to other locking devices.The inclined-plane of slide body 62 and the flank for adjusting screw have self-locking spy
Property, it can be ensured that air intake duct will not move.
The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art
It for art personnel, can also make several improvements without departing from the principle of this utility model, these improvement also should be regarded as
The protection scope of the utility model.
Claims (7)
1. a kind of adjustment structure of the air intake duct of centrifugal compressor and impeller concentricity, including impeller (1), air intake duct (2), spiral case
(3), shaft (4) and casing (5), the spiral case (3) are fixed on casing (5), and air intake duct (2) is set on the inside of spiral case (3), shaft
(4) rotation is set in casing (5), and the top of shaft (4) stretches in air intake duct (2) and is fixedly connected with impeller (1), feature
Be: uniformly distributed there are three Slanted slide block mechanism (6) between the air intake duct (2) and spiral case (3), Slanted slide block mechanism (6) is fixed on snail
On shell (3), and one end of Slanted slide block mechanism (6) contacts on the outer circle wall of air intake duct (2)；
The Slanted slide block mechanism (6) includes oblique sliding rail (61), slide body (62), adjusts screw (63) and helical spring (64), institute
It states oblique sliding rail (61) to be fixedly connected on spiral case (3), slide body (62) is slidably connected on oblique sliding rail (61), is adjusted screw (63)
Across slide body (62) and it is threaded on oblique sliding rail (61),
Helical spring (64), which is sheathed on, to be adjusted on screw (63), and the bottom end of helical spring contacts on oblique sliding rail (61), top
It contacts on slide body (62), slide body (62) is contacted at and adjusted on screw (63) by helical spring, is set on slide body (62)
There are thrust inclined-plane (60), which contacts on the outer circle wall of air intake duct (2).
2. the adjustment structure of the air intake duct of centrifugal compressor as described in claim 1 and impeller concentricity, it is characterised in that: institute
It states there are three being set on the outer circle wall of air intake duct (2) thrust slot (21), the thrust inclined-plane (60) of slide body (62) contacts at thrust
In slot (21).
3. the adjustment structure of the air intake duct of centrifugal compressor as claimed in claim 2 and impeller concentricity, it is characterised in that: institute
The width for stating thrust slot (21) is greater than the width of slide body (62).
4. the adjustment structure of the air intake duct of centrifugal compressor as described in claim 1 and impeller concentricity, it is characterised in that: institute
Oblique sliding rail (61) are stated equipped with mounting hole (610), the bottom of the mounting hole (610) is equipped with threaded hole (611), mounting hole (610)
It is coaxially disposed with threaded hole (611), and is both arranged along the glide direction of slide body (62), helical spring (64) is placed in peace
It fills in hole (610), adjusts screw (63) and be threaded in threaded hole (611).
5. the adjustment structure of the air intake duct of centrifugal compressor as described in claim 1 and impeller concentricity, it is characterised in that: institute
The bottom end for stating oblique sliding rail (61) is equipped with fixed feet (612), and fixed feet (612) is fixed by bolts on spiral case (3).
6. the adjustment structure of the air intake duct of centrifugal compressor as described in claim 1 and impeller concentricity, it is characterised in that: institute
Thrust inclined-plane (60) is stated to be parallel to each other with air intake duct (2) axis.
7. the adjustment structure of the air intake duct of centrifugal compressor as claimed in claim 6 and impeller concentricity, it is characterised in that: institute
The angle stated between the sliding surface between slide body (62) and oblique sliding rail (61) and thrust inclined-plane (60) is 5-10 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821253060.4U CN209370164U (en) | 2018-08-06 | 2018-08-06 | A kind of adjustment structure of the air intake duct of centrifugal compressor and impeller concentricity |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821253060.4U CN209370164U (en) | 2018-08-06 | 2018-08-06 | A kind of adjustment structure of the air intake duct of centrifugal compressor and impeller concentricity |
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| CN209370164U true CN209370164U (en) | 2019-09-10 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108980113A (en) * | 2018-08-06 | 2018-12-11 | 南京磁谷科技有限公司 | A kind of adjustment structure of the air intake duct of centrifugal compressor and impeller concentricity |
| CN111473967A (en) * | 2020-05-12 | 2020-07-31 | 中国航发湖南动力机械研究所 | Centering structure and turbine test device with same |
-
2018
- 2018-08-06 CN CN201821253060.4U patent/CN209370164U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108980113A (en) * | 2018-08-06 | 2018-12-11 | 南京磁谷科技有限公司 | A kind of adjustment structure of the air intake duct of centrifugal compressor and impeller concentricity |
| CN108980113B (en) * | 2018-08-06 | 2024-03-15 | 南京磁谷科技有限公司 | Structure for adjusting concentricity of air inlet channel and impeller of centrifugal compressor |
| CN111473967A (en) * | 2020-05-12 | 2020-07-31 | 中国航发湖南动力机械研究所 | Centering structure and turbine test device with same |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: No. 99, Jinxin Middle Road, Jiangning District, Nanjing City, Jiangsu Province Patentee after: Nanjing Cigu Technology Co., Ltd Address before: Nine No. 211102 Bamboo Road, Jiangning Development Zone, Nanjing, Jiangsu, 100 Patentee before: NANJING CIGU LIMITED Corp. |
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| CP03 | Change of name, title or address |