CN209309010U - Impeller and gas pump - Google Patents

Abstract

The utility model provides a kind of impeller and gas pump.Impeller includes: wheel shaft, upper wheel disc, blade to, lower wheel disc.Upper wheel disc and lower wheel disc, are the rotary body concentric with wheel shaft, and have parallel opposing surfaces, and upper wheel disc connects wheel shaft with one heart upwards, and lower wheel disc opens up downwards axle center pipe with one heart；Blade surrounds wheel shaft central symmetry to for two blades, is in equidistant helical morphology；The axial both sides of blade pair are bonded respectively and connect the opposite face, two pipelines being consequently formed, and in impeller rotation, internal gas radial diffusion or radial direction can be pushed to collect.Gas pump is based on Impeller Design.The impeller and gas pump of the utility model, use for reference the sealing advantage of traditional closed impeller, it corrects the mistake and deficiency of its specific structure: being measured by identical pump housing volume, turbine traction combination pump can be surmounted, not only there is higher compression ratio, it can work in broader pressure limit, and there is bigger fortune flux and speed.

Description

Impeller and gas pump

Technical field

The utility model belongs to the directed flow and pressure controlling mechanical equipment of gas, is related to the gas such as vacuum pump, compressor Body pump.

Background technique

Mechanical gas pump is many kinds of, and operating mode is different.And each advantageous and disadvantage, it can not substitute each other. Even without a kind of gas pump, it can not only make compressor but also vacuum pump can be done.They are unique what is common is that structure is complicated, Volume is at high cost greatly.It is therefore desirable to think deeply completely new gas pump design concept, completely new theory structure is provided.Vacuum pump and pressure The function of contracting machine is all to generate gas differential pressure, only contrary.Certainly specific operating condition is different certainly.

By the high speed rotation of totally enclosed impeller, cooperate static reduction of speed diffusion channel, realizes the centrifugation of fortune function Formula compressor, for impeller noose on wheel shaft straight down, impeller is successively upper wheel disc, several blades, lower whorl from top to bottom Disk.Upper wheel disc and lower wheel disc are the rotary body concentric with wheel shaft.Upper wheel disc is in disk form, and lower wheel disc is in funnel shape, leaf Piece is in helical morphology around wheel shaft, and several blades surround wheel shaft central symmetry.

For the construction of accurate description centrifugal gas pump, needs first to illustrate the technical term of several machinery fields below and determine Justice:

The surfaces of revolution --- axis section is in identical and symmetrical line segment form at any angle for it.

Rotary body --- axis section is in identical and symmetrical closed curve form at any angle for it.

Helical --- the polar diameter of each point and polar angle are linearly related on curve.

Central symmetry --- form elements are angularly uniformly distributed around axis, and space where form elements can rotate It is overlapped.

The axial both sides of every blade are respectively in conjunction with the lower surface of upper wheel disc and the upper surface of lower wheel disc, to make two Adjacent blade and corresponding upper wheel sections and lower wheel sections constitute a fortune pipeline.There are several blades just to have several Fortune pipeline, usually 6 or so.The circulation area of fortune pipeline is identical everywhere along place helical.

The inner end of every blade terminates in the outside of the axle center hole (i.e. the osculum of funnel) of lower wheel disc.Therefore the axle center hole is The common air entry of all fortune pipelines, ambient atmos are first radially supplemented into fortune pipe axially into impeller by axle center hole again Road.

Upper wheel disc and lower wheel disc circular outer edge periphery having the same, the outer end of every blade terminates in the outer circumference Side.The external port of every fortune pipeline is respective to extraneous exhaust outlet.Gas in fortune pipeline is eventually by outside it Leave impeller in port.

To outer perimeter from axle center, every blade is towards the back-flexing of rotation.And adjacent two blade helicals Spacing is gradually widened.The outer end of blade can be parallel to wheel shaft, but the inner end of blade necessarily tilts, i.e. trend turbo blade shape State.For the diameter of blade to the midline the place surfaces of revolution, tilt angle of the every tangent line with respect to the radial line at this point on helical Mostly at 45 ° or so.

By the high speed rotation of impeller, blade is set to generate centrifugal force to the gas of contact, by gas by axle center in pipeline External port is pushed in hole to, to realize gas pump continuously fortune function.In other one timings of condition, the revolving speed of impeller is got over Height, blade are bigger to the centrifugal force of the gas of contact, and the fortune function of gas pump is better.It is this from operation principles Gas pump belongs to centrifugal gas pump.

Average molecular draws vacuum pump, by identical pump housing volume ratio compared with this centrifugal gas pump configuration is simply at low cost Honest and clean, fortune flux is big.But the compression of the exhaust outlet and air entry of impeller is relatively low, therefore closed container can not be made to realize that superelevation is true Empty or super large pressure.

This centrifugal gas pump bright spot most outstanding in design principle is, in addition to the air-breathing rotated at impeller axle center Connection at mouth and pump case axle center between static air inlet needs outside rotary seal, and entire impeller can be fully integrated sealing 's.This advantage is no in the structure of other gas pumps.The utility model thinks this for mechanically designing gas Body pump realizes that the effort of super large compression ratio is extremely important.

Existing centrifugal gas pumps existing main problem:

One, helical angle is unreasonable, and helical where blade is excessive with respect to the tilt angle of contour, in impeller suffered by gas The circumferential component of blade thrust is excessive.Its design principle is to be centrifuged the maximization of component.Without bearing in view of circumferential component Face effect: thrust is perpendicular to blade surface, therefore being centrifuged component keeps gas mobile to exhaust outlet direction, and circumferential component makes gas It is mobile to air entry direction.

Certainly, if blade is in several radial alignments, i.e. thrust is entirely circumferential, and blade is to head-on gas without radial Centrifugation component, even if in the extreme case, gas in fortune pipeline still can due to the inertia of itself radial diffusion. But due to the quality very little of gas itself, i.e. inertia very little, generated centrifugal force is centripetal with respect to the ambient atmos being subject to Pressure is necessarily extremely limited, therefore the fortune function of such gas pump is necessarily extremely limited.

The radial diffusion of gas in impeller, the centrifugation masterpiece mainly applied by blade by the high speed rotation of impeller Result.Blade can generate the gas of contact huge under the circumference of the high-speed rotation because bending backward and the rigidity of itself Big centrifugal force.

Two, the distance between two adjacent blades are bigger closer to outer perimeter, and outer perimeter is all open to the external world, cause Make the axial height of blade must be smaller closer to outer perimeter.Because the sectional area of fortune pipeline must be from inside to outside everywhere It is identical.So by identical helical segment length measure, the forced area of the biggish outer end of linear velocity be less than instead linear velocity compared with The forced area of small inner end.Such configuration design wastes the outer space of impeller preciousness.

On the other hand, the external port of fortune pipeline is bigger, and the pressure of suffered ambient atmos is also bigger, therefore outer perimeter It is all open to the external world, it is highly detrimental to the raising of compression ratio.In fact, the liquid pumps class such as the structure design of its impeller and water pump Seemingly, therefore the lighter pump fortune effect of the specific gravity of gas is poorer.

Three, the length of every blade is too short, so that the centrifugal force integral of whole blade is too small.Obviously cutting in fortune pipeline One timing of area, ambient atmosphere is exactly certain to the pressure of the gas in pipeline, therefore the length of fortune pipeline is shorter, is applied Inevitable smaller to the centrifugal force integral of gas in pipelines, the air pressure difference, that is, compression ratio that can be maintained is lower.

Four, there are gap, sealing is difficult for the connection of dynamic fortune pipeline and static diffusion pipeline.There is wheel in axle center hole Axis passes through, therefore increases the internal diameter of axle center hole, that is, increases the difficulty of rotary seal between air entry and air inlet.

Above-mentioned several main aspects are to cause existing this centrifugal gas pump fortune strength too small, and compression ratio is excessively low The main reason for problem.

Utility model content

The purpose of this utility model is that using for reference the sealing advantage of traditional closed impeller, the mistake of its specific structure is corrected Accidentally with deficiency, gas pump that is a kind of while having compressor Yu vacuum pumping function is provided: being measured by identical pump housing volume, it can Surmount turbine traction combination pump, not only there is higher compression ratio, can work in broader pressure limit, and has bigger Fortune flux and speed.

To achieve the goals above, the utility model uses following technical scheme:

The composition of impeller: including from top to bottom, and upper wheel disc, two blades, lower wheel disc, wheel shaft connect take turns straight down Disk, lower wheel disc open up axle center pipe straight down.Upper wheel disc and lower wheel disc, are the rotary body concentric with wheel shaft, and are had parallel Opposite face.Two blades, perpendicular to the opposite face, or are parallel to wheel shaft, and surround wheel shaft central symmetry, equidistant in two Helical morphology.

The axial both sides of blade are bonded and connect with the opposite face respectively, and two fortune being centrosymmetric are collectively formed Pipeline.When the spacing of a pair of of blade of fortune pipeline is identical everywhere, upper wheel disc is parallel with the opposite face of lower wheel disc namely spacing at Locate identical, then the circulation area of pipeline is inevitable identical everywhere along place helical.

The so-called centrosymmetric two equidistant helicals of the utility model, it is intended that two helicals are interlaced, and interval is adjacent, Parallel and spacing is identical everywhere.

The opposite face of upper wheel disc and lower wheel disc is generally Plane of rotation.It is also possible to the rotation being parallel to each other in special circumstances Curved surface, such as the rotational circle conical surface, rotation arc surface etc.；The center line of the hand of spiral on the axial both sides or blade of blade, point It is not centrosymmetric around wheel shaft, and along place surface of revolution, i.e., is in equidistant helical in surface of revolution.

Curved surface is parallel to each other, and refers on curved surface that all equal (distance of point to curved surface, refers to every distance to another curved surface The shortest distance of all the points on the point to curved surface).

In addition when the opposite face of upper wheel disc and lower wheel disc surface of revolution stepping in axial spacing, two blades are then Two displacement helicals being centrosymmetric, to keep the circulation area of fortune pipeline identical everywhere along place helical.Normal condition Under this design in space utilization be unreasonable, and artificially increase the complexity of gas pump configuration.

Inner hole, that is, axle center hole of axle center pipe, the inner end of two blades terminates in the outside of axle center hole, therefore axle center hole is two The common air entry to ambient atmosphere of fortune pipeline, ambient atmos are first axially into axle center hole again radially into fortune pipe Road.The circulation area of the twice fortune pipeline of axle center hole area.

Upper wheel disc and lower wheel disc have size and shape approximate, outer perimeter (upper wheel disc and the lower whorl being centrosymmetric Disk is in rotary body, is for its main body, it can not include its outer perimeter).The outer end of two blades terminates in described outer Edge periphery, the external port of every fortune pipeline are that its is respective to extraneous exhaust outlet.Gas in fortune pipeline finally leads to It crosses its external port and leaves impeller.

From impeller visual direction wheel shaft (i.e. from bottom to top), wheel shaft rotates counterclockwise to be known as rotating forward, and wheel shaft rotates clockwise title For reversion.

Around wheel shaft central symmetry, in two blades of equidistant helical morphology, referred to as blade pair.To outer circumference from axle center Side, blade is to bending clockwise, and referred to as positive blade pair, blade is to bending counterclockwise, referred to as backward vane pair.Positive blade pair Impeller be known as positive impeller；The impeller of backward vane pair is known as reverse impeller.Positive impeller and positive impeller or reverse impeller With reverse impeller, impeller referred to as in the same direction.

Positive blade pair when wheel shaft rotates forward, the backward vane pair when wheel shaft reverse turn, generation centrifugal force, i.e., in fortune pipe In road, gas is pushed to external port by axle center hole；Backward vane pair when wheel shaft rotates forward, the positive blade pair when wheel shaft reverse turn, It generates centripetal force and gas is pushed to axle center hole by external port that is, in fortune pipeline.But no matter impeller is rotated forward or is inverted, Positive impeller or reverse impeller, gas in pipelines always flow to higher-pressure region from low-pressure area.

The efficiency of the efficiency that the efficiency that reverse impeller rotates forward will be rotated forward lower than positive impeller, positive impeller reversion will be lower than anti- The efficiency inverted to impeller.Gas i.e. in fortune pipeline is easy to spread, and is not easy to collect.Because light gas is also to have again Quality has inertia, and what the circumferential component of blade thrust was constantly present, therefore gas is rotated around wheel shaft, itself necessarily leads to Centrifugal force.

Following discussion, if referring both to positive impeller without especially indicating and rotating forward.

Impeller is generally directly driven by steam turbine, high-speed motor etc..Or it is first driven by other engines such as ordinary motor Accelerator, then rotated by the wheel shaft of accelerator driving impeller.The revolving speed of engine is higher, i.e. the revolving speed of impeller is higher, leaf Piece is bigger to the centrifugal force of the gas of contact, and the fortune function of gas pump is better, is more able to achieve higher air pressure difference (pressure Contracting ratio).

But the revolving speed of impeller is higher, dynamically balanced difficulty is bigger, more need the design of reasonable structure with it is higher Craft precision is realized.

Ideal fortune mode is that gas only does radial diffusion or collects without rotating with impeller in impeller, to mention as far as possible The promotion efficiency of high blade reduces gas by speed and improves pressure.Otherwise it will be added multiple as conventional centrifugal compressor Miscellaneous and huge static deceleration diffusion structure.The effect of the stator blade of turbine type vacuum pump, which is lain also in, prevents air-flow from following movable vane piece Rotation, principle are similar.Therefore the thickness of blade should be reduced, as far as possible under the premise of mechanical strength allows to mitigate in impeller The circumferential disturbance of gas.

The difference of Ring and solid ring is that after the circumferential component being subject to disappears, Ring will not be as solid ring There is rotatory inertia like that.As long as therefore circumferential component is sufficiently small, it is not necessary to add static deceleration to the gas in fortune pipeline Diffusion structure.

Only one external port, i.e. a blade, the impeller of a fortune pipeline can not accomplish dynamic when high speed rotation Balance.Therefore certain under normal circumstances in other conditions, in two external ports, i.e., the pressure of ambient atmos suffered by impeller is Two blades, it is minimum when two fortune pipelines.Helical length at this time is so that the integral of centrifugal force is maximum, therefore compression ratio is most Greatly.

In other one timings of condition, reduces the spacing of helical, the length of helical can be increased, while it is relatively all to reduce helical The tilt angle of line, to increase the compression ratio of impeller.Although at this moment the centrifugation component of every bit can reduce, tangential component subtracts More obviously small, i.e. the accounting of centrifugation component is increasing.Another aspect external port is reducing, the radial pressure of extraneous gas Reducing.And due to the increase of helical length, the net value for integrating overall centrifugation component is increasing.

Helical spacing can not be too small in practical applications, because blade must have certain application intensity i.e. thickness, And one timing of sectional area of fortune pipeline, axial height are excessive also impracticable.Specific size will be wanted according to specific function Depending on asking.

At impeller axle center rotate axle center pipe, after adding rotary seal bearing, then with lower package static at pump case axle center Connection, could become gas pump, could closed container is evacuated or be inflated.The effect of rotary seal is better, and impeller can maintain Air pressure difference it is higher.When wheel shaft is not passed through the axle center hole of impeller, axle center hole can accomplish minimum, this is conducive to rotate close Envelope.

The series connection of impeller: multiple forward direction impellers and multiple reverse impellers, alternately neighboring concentric fitting is arranged side by side.Positive impeller shaft Air entry at the heart, the exhaust outlet at the reverse impeller axle center adjacent with lower section are axially connected to, while positive impeller outer edge periphery Exhaust outlet, the air entry of the reverse impeller outer perimeter adjacent with top is axially connected to.I.e. each fortune duct orientation is consistent, Concatenation connection makes the superposition of every grade of wheel compresses ratio of total compression ratio at a fortune pipeline.

The parallel connection of impeller: multiple forward direction impellers are bonded side by side with one heart, and the air entry at each impeller axle center is axially connected to；Or it is more A reverse impeller is bonded side by side with one heart, and the exhaust outlet at each impeller axle center is axially connected to.Constitute the parallel connection of impeller.Impeller in parallel Fortune flux be every grade of impeller fortune flux superposition, therefore air entry at axle center or exhaust outlet need corresponding increase.

Compared with the turbine traction vacuum pump being most widely used at present, it will be appreciated that the utility model is in fortune speed With the main aspects such as compression ratio, all have substantial advance outstanding and the utility model has the advantages that

The movable vane piece and stator blade of turbine type gas pump are in multiple one end fixations jointly around wheel shaft relative rotation Flabellum form, the unbearable biggish air pressure difference in blade two sides；It is needed between the rotor and pump case of towed gas pump minimum Rotation gap, craft precision and applicable elements require harsh.

The blade of the centrifugal gas pump of the utility model fixes form in the both ends of one, and except the axle center at axle center Pipe lower package between there are the rotation gaps of very little to need outside rotary seal, the series and parallel of impeller or impeller is in integrated complete Sealing structure, therefore firm pressure resistance, i.e. blade two sides can bear very big air pressure difference and be not easy to reveal, can be bigger Pressure limit work.

Compare by identical pump housing volume, the centrifugal gas pump of the utility model has high compression ratio (single-stage leaf Wheel is i.e. up to 100 times or more), it can make closed container is inside and outside to realize bigger air pressure difference, and fortune speed is faster.Pressure model It is trapped among 10^-9pa or less to 800Mpa or more.Therefore have a wide range of application, can both have been used as vacuum pump or as compression Machine uses.In addition the utility model simple in structure and low in cost.

The additional technical feature and its advantage of the utility model will illustrate more obvious in following description content, or It is recognized that by the concrete practice of the utility model.

Detailed description of the invention

The following drawings only belongs to the utility model and thinks some embodiments for needing attached drawing that description is assisted to illustrate.In addition Some the utility model are thought not provide attached drawing then with the embodiment that language can express clearly merely.

Attached drawing 1 is the benchmark impeller of the utility model and the main view and bottom view of two kinds of connection structures.

Attached drawing 2 is that the series connection impeller of the utility model and its axis of gas pump configuration cut open figure.

Attached drawing 3 is that the axis of the impeller in parallel of the utility model cuts open figure.

Specific embodiment

Described below is also only several typical embodiments of the utility model and not all embodiments, and therein Structure and component can all do simple routinely variation design.Therefore here description be only and selected embodiment It is related.If a certain title concept is interpreted definition at one, do not need again to annotate it in the description that follows Definition.

" top " that occurs in description, " lower section ", "left", "right", "inner", "outside" "vertical", "horizontal", "center" etc. refer to The orientation or positional relationship shown is to be based on the orientation or positional relationship shown in the drawings or when utility model product uses is used The orientation or positional relationship often put is merely for convenience of describing, rather than the device or element of indication or suggestion meaning are necessary With specific orientation, it is constructed and operated in a specific orientation." first ", " second " in description etc. are only used for distinguishing description, It is not understood to indicate or imply relative importance.

" parallel " in the utility model description, " identical ", "horizontal", the terms such as "vertical" are not offered as requiring these portions Part or structure must be absolute it is parallel, it is identical, it is horizontal, it is vertical etc..Parallel, identical, level is substantially achieved, it is vertical etc..

Common impeller form includes at least following three kinds:

One, benchmark impeller

A figure and impeller shown in B figure in Fig. 1, upper wheel disc 8 and lower wheel disc 9 are the circular panels concentric with wheel shaft 10.Leaf Piece perpendicular to upper wheel disc 8 and lower wheel disc 9, that is, is parallel to wheel shaft 10 to 3.Such blade wheel structure is simple and practical, because of referred to herein as base Quasi- impeller.

Upper figure is impeller in A figure from the bottom view after intermediate horizontal section in Fig. 1.Show blade to 3 two blades 3, it to outer perimeter from axle center, is bent clockwise, surrounds 10 central symmetry of wheel shaft, the equidistant scroll coiled in two multi-turns State.

Blade is bonded and connect with the opposite face of upper wheel disc 8 and lower wheel disc 9 respectively to 3 axial both sides, is collectively formed two Item surrounds the centrosymmetric fortune pipeline of wheel shaft 10, and the circulation area of pipeline is identical everywhere along place helical.The expression of two row arrows, Gas in pipeline, the axle center hole 2 from axle center are spread to the external port 1 of outer perimeter.It is consequently belonging to the rotating forward of positive impeller State.

Two, series connection impeller

As shown in Fig. 2, can make gas pump that there is biggish compression ratio by the series connection of impeller.In upper wheel disc 8 and lower wheel disc Between 9, it is interleaved alternately with several small trochal discs 16 and big trochal disc 17, forms the section of several axial spacings equalization.Small trochal disc 16 It is equally the circular panels concentric with wheel shaft 10 with big trochal disc 17.Each section is interleaved alternately with positive blade to 3 and reversed Blade is bonded to each other and connects to 3, and up and down, formed several with one heart fitting side by side, and alternately adjacent positive impeller and anti- To impeller.

The lower section of small trochal disc 16 is that positive blade is backward vane to 3 to 3 tops.The lower section of big trochal disc 17 is backward vane It is positive blade to 3 to 3 tops.Big trochal disc 17 has centre bore 18 and small trochal disc 16 is non-porous.Centre bore 18 and 2 internal diameter of axle center hole It is identical.Therefore centre bore 18 becomes the connection of the exhaust outlet of reverse impeller and the air entry of the axially adjacent positive impeller in top Place.

To describe and understanding simplicity, a backward vane is only shown to 3 (the arrow direction centers of circle) in figure, is located at upper and lower two Positive blade is between 3 (arrow direction peripheries).And only 4-5 is enclosed.

Rotating cylinder 7 is the round tube concentric with wheel shaft 10, and the positive blade of 16 big trochal disc of lower 9 small trochal disc of wheel disc 17 is to 3 backward vanes To 3 integral assemblings in rotating cylinder 7.The inner circumferential disc knot of the periphery disc of lower wheel disc 9 and the periphery disc of big trochal disc 17 and rotating cylinder 7 It closes, 16 outer diameter of small trochal disc is less than 12 internal diameter of rotating cylinder, the circulation of the twice external port 1 of the circulation area of looping pit 4 between the two Area.Therefore looping pit 4 is the junction of the exhaust outlet of positive impeller Yu the air entry of the axially adjacent reverse impeller in top.

Three, impeller in parallel

As shown in figure 3, the fortune flux of gas pump can be improved by the parallel connection of impeller.At this moment need to increase blade 3 Axial height.For the rigidity for keeping blade 3, the compressive resistance of impeller and the stability of rotation can be in upper wheel discs 8 and lower wheel disc It is inserted into several big trochal discs 17 between 9 and engages fixation with blade 3.It is in the axial composite-rotor of similar several impellers in the same direction by wheel space It is superimposed form, the i.e. parallel connection of impeller.Blade can be identical to 3 between each layer of impeller in parallel, it is possible to have phase difference.Respectively It both respectively independent can also can be axially connected between layer fortune pipeline.2 circulation of axle center hole be equal to each 1 circulation of external port it With.

Impeller and the wheel shaft of top 10 be connected and fixed mode at least there are three types of:

One, axis hole is equipped at upper 8 axle center of wheel disc, shaft hole diameter is identical as 10 outer diameter of wheel shaft.Axis hole and wheel shaft 10 pass through key Slot mode or close-fitting mode, are concentrically mounted to together.

Two, for A figure as shown in figure 1 with shown in upper figure, the lower end of wheel shaft 10 is in one section of round tube form, referred to as end pipe 2, end pipe 2 It can as shown in the figure be in a volume morphing with wheel shaft 10, the concentric socket form of 2 upper port of end pipe can also be closed in wheel shaft 10.End The 2-4 side openings 5 being centrosymmetric are opened up around pipe 2, the axial height of side opening 5 and the axle center height of impeller are consistent.

It at upper 8 axle center of wheel disc and at lower 9 axle center of wheel disc, opens up and is slightly less than 2 outer diameter of end pipe, and be adjacent to 5 outer end end of side opening The fixation hole of mouth plane.End pipe 2 is downward through the fixation hole, and side opening 5 and impeller maintain an equal level, then the fixation hole can block The axial frame 6 of side opening 5 makes wheel disc 8 and lower wheel disc 9 be fixed together with end pipe 2.

End pipe 2 and fortune pipeline is connected in side opening 5 at this time, therefore end pipe 2 is axle center pipe 2.On this fixed form is suitble to Wheel disc 8 and lower wheel disc 9 are harder plastic cement material etc..

Three, shown in B figure as shown in figure 1, the shaft end of wheel shaft 10 is in 2 form of end pipe, and end pipe 2 can be as shown in the figure with wheel shaft 10 In a volume morphing, the concentric socket form of 2 upper port of end pipe can also be closed in wheel shaft 10.It is opened up around end pipe 2 during 2-4 is in The symmetrical side opening 5 of the heart, the axial height of side opening 5 are equal to the axle center interval of upper wheel disc 8 and lower wheel disc 9.

The circular fixation hole for being slightly less than 2 outer diameter of end pipe, end pipe 2 are opened up at upper 8 axle center of wheel disc and at lower 9 axle center of wheel disc Downward through the fixation hole, and the axle center interval of side opening 5 and upper wheel disc 8 and lower wheel disc 9 maintains an equal level.End pipe 2 is connected in side opening 5 at this time With fortune pipeline, therefore end pipe 2 is axle center pipe 2.

On the periphery disc of the end pipe 2 outside the axial ends of side opening 5, it is prominent axially to open up the rib that several are centrosymmetric It rises, is the annular knurl fixing its radiator fan and being opened up just as motor shaft.Rib protrusion exists with respect to the height of 2 periphery disc of end pipe 0.1mm-0.3mm.The rib protrusion of end pipe 2 can block the fixation hole of wheel disc 8 and lower wheel disc 9, upper wheel disc 8 and lower whorl Therefore disk 9 is fixed together with end pipe 2.This fixed form is suitble to wheel disc 8 and lower wheel disc 9 is the metal materials such as steel.

Lower 9 blade 3 of wheel disc of upper wheel disc 8, can first respectively by metal plate punching press again by laser welding or ultrasonic bonding or Tin welding or riveting plus bonding are integral.Or by integrated die-castings such as aluminum alloy copper alloys or by animi resin integrated injection molding can also lead to It is once-forming to cross 3 D-printing.

Impeller is located in pump case.The motor 11 or other engines of impeller rotation are driven, can both be located at pump as shown in Figure 2 In shell, it can also be located at outside pump case.When engine is located at outside pump case, the drive shaft of engine passes through pump case with needing rotary seal It is connect with the wheel shaft 10 of impeller.

Pump case can be screwed togather and be constituted by upper casing 12 and lower casing 13.Upper casing 12 opens up upper casing pipe 21 outward.At 13 axle center of lower casing to Under open up step pipe.Step pipe top is biggish pipe spreader 19, and lower part is lesser lower package 20.Hold level with both hands on pipe spreader 19 Platform 23, the upper transverse plane of annular table 23 are bonded with the bottom plane rotation of the lower wheel disc 9 in 2 outside of axle center pipe in a ring for face extension. The inner circumferential disc of pipe spreader 19 is bonded with the rotation of the periphery disc of axle center pipe 2.The lower end plane of axle center pipe 2 is upper with lower package 20 Transverse plane rotation fitting.

It is that motor 11 provides power that power supply line 22, which enters lower casing 13 from side,.Pass through positioning sleeve between lower casing 13 and motor 11 14 are connected and fixed positioning.It is equipped with axial gas passages around positioning sleeve 14, is connected to the external port 1 of impeller and the upper package of upper casing 12 21。

The gas pump of the utility model as vacuum pump in use, the sealing of lower package 20 and closed container is connected to, and upper casing Pipe 21 is open, so that closed container is formed vacuum by the rotation pumping of impeller.The gas pump of the utility model makes as compressor Used time, upper package 21 are connected to closed container sealing, and lower package 20 is open, is made in closed container by the Inflatable rotary of impeller Pressure increases.

At least 2 kinds of rotary seal mode of communicating of axle center pipe 2 and lower package 20:

1, as shown in Figure 1, the shaft end of wheel shaft 10 is in end pipe 2, end pipe 2 is passed down through lower casing 13 and is located in lower package 20, holds The inner circumferential disc of the periphery disc of pipe 2 and lower package 20 is in quasi- contact condition；Or the periphery disc of end pipe 2 uniformly open up it is several The upper port of dynamic pressure groove, lower package 20 is located in the middle part of the dynamic pressure groove, makes end pipe 2 and lower package 20 in air cushion contact condition.From And so that end pipe 2 (axle center pipe 2) is formed rotary seal with lower package 20 and be connected to.

Since end pipe 2 is the shaft end of wheel shaft 10, the precision of wheel shaft 10 is high, it is ensured that end pipe 2 is inclined when rotating at high speed It moves minimum, i.e., can keep minimum with the rotation gap of lower casing 13, be in quasi- sealing state.This rotary seal mode of communicating, it is non- Often suitable compression ratio is (because axial frame 6 has circumferential disturbance to gas) of less demanding, but is particular about the civilian electricity of cost control Device uses.

2, as shown in Fig. 2 Fig. 3, the bottom plane and axle sleeve of the lower wheel disc 9 being bonded with the upper end Plane Rotation of annular table 23 The periphery disc of the axle center pipe 2 of the inner circumferential disc rotation fitting of pipe 19, opens up multiple dynamic pressure grooves and lower casing being centrosymmetric The lower end plane of the axle center pipe of the upper end Plane Rotation fitting of pipe 20 is collectively formed between lower wheel disc 9 and lower casing 13 as Ba Qu Air cushion bearing, this air cushion bearing itself has a rotary seal effect, therefore is formed between axle center pipe 2 and lower package 20 and turned Dynamic sealing connectivity structure.

To describe and understanding conveniently, Fig. 2 air cushion bearing shown in Fig. 3 is in a volume morphing with lower wheel disc 9 and lower casing 13.It is real In the application of border, air cushion bearing and lower wheel disc 9 and lower casing 13 can be in separable assembled form.I.e. as prior art, it is rotating The rotating ring of fitting and determine to form air cushion bearing between ring, rotating ring is fitted and connected with lower wheel disc 9, is determined ring and is fitted and connected with lower casing 13.

Claims (6)

1. a kind of impeller, characterized by comprising: wheel shaft, upper wheel disc, blade are to, lower wheel disc；

Upper wheel disc and lower wheel disc, are the rotary body concentric with wheel shaft, and have parallel opposing surfaces, and upper wheel disc connects with one heart upwards Wheel shaft, lower wheel disc open up downwards axle center pipe with one heart；

Blade surrounds wheel shaft central symmetry to for two blades, is in equidistant helical morphology；The axial both sides of blade pair, are pasted respectively Merge and connect the opposite face, two pipelines being consequently formed can push its internal gas radial diffusion in impeller rotation Or radial direction is collected.

2. impeller according to claim 1, which is characterized in that upper wheel disc and lower wheel disc have horizontal opposite face, blade To perpendicular to the opposite face.

3. impeller according to claim 2, which is characterized in that it is in multiple positive blades pair between upper wheel disc and lower wheel disc, With multiple backward vanes pair, alternating neighboring concentric form arranged side by side；Backward vane is to downward, and positive blade is to upward, with small trochal disc It is fitted and connected；To upward, positive blade is fitted and connected with big trochal disc to downward backward vane；Small trochal disc and big trochal disc be with The concentric horizontal disk of wheel shaft；The periphery disc of lower wheel disc and the periphery disc of big trochal disc, are bonded with the inner circumferential disc of rotating cylinder Connection；Rotating cylinder is the round tube concentric with wheel shaft；There is looping pit, big trochal disc has centre bore between small trochal disc and rotating cylinder；Impeller Overall compression ratio be every grade of wheel compresses than the sum of.

4. impeller according to claim 2, which is characterized in that it is in multiple blades pair in the same direction between upper wheel disc and lower wheel disc, Concentric form arranged side by side, and between adjacent blades pair, is fitted and connected by big trochal disc, big trochal disc be with centre bore, and it is same with wheel shaft The horizontal disk of the heart；Total fortune flux of impeller is the sum of every grade of impeller fortune flux.

5. a kind of gas pump, characterized by comprising: pump case, air cushion bearing, the described in any item impellers of claim 1-4；

Pump case includes lower casing, opens up step pipe at the axle center of lower casing downwards, and step pipe top is pipe spreader, and lower part is lower package, Pipe spreader upper end is extended to annular table；Annular table is bonded with lower whorl disk axial-rotation, and pipe spreader is bonded with axle center pipe radial rotary, Lower package is bonded with axle center pipe axial-rotation；

The periphery disc of the bottom plane for the lower wheel disc being bonded with annular table rotation, the axle center pipe being bonded with pipe spreader rotation, Multiple dynamic pressure grooves being centrosymmetric are opened up, the lower end plane for the axle center pipe being bonded with the rotation of lower package is as Ba Qu, common shape At the rotary seal between the air cushion bearing and axle center pipe and lower package between lower wheel disc and lower casing.

6. a kind of gas pump, characterized by comprising: pump case, end pipe, the described in any item impellers of claim 1-2:

End pipe is a Duan Yuanguan, opens up several side openings being centrosymmetric between two parties；Pump case includes lower casing, downward at the axle center of lower casing Open up lower package；

Wheel shaft lower end with end pipe is concentric connect, and close the upper port of end pipe, end pipe penetrates downwards and fix impeller, and side opening is located at In impeller, the periphery disc of end pipe lower end is contacted with the inner circumferential disc standard of lower package, forms the rotation between axle center pipe and lower package Sealing.