CN112922906A - Air cooling structure of two-stage centrifugal air compressor - Google Patents
Air cooling structure of two-stage centrifugal air compressor Download PDFInfo
- Publication number
- CN112922906A CN112922906A CN202110346368.3A CN202110346368A CN112922906A CN 112922906 A CN112922906 A CN 112922906A CN 202110346368 A CN202110346368 A CN 202110346368A CN 112922906 A CN112922906 A CN 112922906A
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- China
- Prior art keywords
- air
- cooling
- outlet
- shell
- main shaft
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/582—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/10—Centrifugal pumps for compressing or evacuating
- F04D17/12—Multi-stage pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
Abstract
The air cooling structure of the double-stage centrifugal air compressor is characterized in that cooling compressed air is led out from the middle pipeline and enters the air cooling air inlet through the air cooling air distribution pipe, the cooling compressed air uniformly enters the inner cavity of the shell through the air inlet holes on the air inlet air-homogenizing cover, cooling air passes through the gap between the motor stator and the shell and the main shaft and is uniformly discharged from the air inlet holes on the air outlet air-homogenizing cover on the other side, and the discharged air is discharged from the air cooling air outlet. Through setting up even wind device at casing both ends, with even the guide circulation in the casing of cooling air, discharge from both ends air conditioning gas outlet again, guaranteed cooling air in the inside equilibrium distribution all the time of casing, do not have the not good enough problem of local area cooling effect, through middle pipeline with partial compressed gas introduction casing in realize the cooling to motor, main shaft, journal bearing and axial bearing, improve the life of air compressor machine.
Description
Technical Field
The invention relates to the technical field of air compressor cooling, in particular to an air cooling structure of a centrifugal air compressor.
Background
At present, a centrifugal air compressor is generally designed in a motor direct-drive mode, a motor rotor and a main shaft are made into an integrated structure, a centrifugal impeller is fixedly connected to the end of the main shaft, and the impeller is arranged in a volute. Under the super-high speed rotation of the motor rotor, the impeller drives gas to rotate at high speed to interact with the volute to generate high-pressure and large-flow air which is supplied to a fuel cell engine and used for the generation of electrochemical reaction inside a fuel cell stack, wherein the bearing supports the rotor (including a main shaft and the impeller) integrated rotating part to rotate at high speed.
Centrifugal air compressors often adopt a rotational speed control implementation mode of ultrahigh rotational speed (above 80000 Rpm) to improve the pressure and flow rate of output air, and ultrahigh-speed rotors also bring heat dissipation and cooling problems. Therefore, when the air compressor works, the motor stator is electrified to run and the rotor rotates at a high speed to generate a large amount of heat, the heat is accumulated inside the air compressor to influence the running state of the motor stator, the control circuit of the motor stator and the rotor of the air compressor, and the heat dissipation must be realized timely and effectively. Simultaneously, the heat dissipation is inhomogeneous will make the rotor produce temperature gradient and the thermal bending deformation appears, and to the rotor under the high-speed rotation state, thermal bending deformation will cause the rotor vibration and make whole air compressor machine the vibration condition appear, and when serious, the air compressor machine structure will suffer destruction, causes the air compressor machine to damage even personnel's damage. And the bipolar centrifugal air compressor has higher requirements on the rotation of the rotor.
The casing is often led into the cooling gas of the same way among the prior art and is discharged from the export of the casing other end again to the casing inside, but this method leads to very easily that the cooling gas directly flows and the gaseous flow direction is whole to be partial to the export and let the unable better realization cooling of the position of keeping away from the exit end from the great position in clearance, how can high-efficient balanced realization air compressor machine inside cooling, is the problem that needs the solution at present stage.
Disclosure of Invention
In order to solve the above problems, the present invention provides an air cooling structure of a two-stage centrifugal air compressor, where the centrifugal air compressor includes a casing, a motor stator, a spindle, a compression device disposed at an outer end of the spindle, and an air cooling structure disposed in the casing, and the motor stator and the spindle are embedded in the casing; the two ends of the shell are provided with a cold air inlet and a cold air outlet, the two ends of the inner cavity of the shell are both provided with air homogenizing devices, the air homogenizing devices are arranged between the cold air inlet and the cold air outlet, and the air homogenizing devices are provided with a plurality of air inducing holes which are communicated with the cold air inlet and the cold air outlet;
the motor stator and the main shaft are arranged between the air homogenizing devices at the two ends, and the two ends of the main shaft penetrate through the air homogenizing devices.
Furthermore, both ends of the spindle of the centrifugal air compressor can be provided with compression devices which are communicated through an intermediate pipeline.
Further, the cold air inlet is connected with the middle pipeline through an air-cooling air distribution pipe.
Further, the cold air inlet is connected with the middle pipeline through an air-cooling air distribution pipe.
Furthermore, the even wind device includes even wind lid of air inlet and even wind lid of air-out.
Furthermore, the air inlet and outlet air-homogenizing covers are both back plates integrally formed with the shell.
Furthermore, a plurality of air inducing holes 7 are symmetrically arranged on the air inlet and outlet air-homogenizing covers.
Furthermore, the distribution diameter of the air guiding holes on the air inlet air-homogenizing cover is smaller than that of the air guiding holes on the air outlet air-homogenizing cover.
Furthermore, the cooling compressed gas is led out from the middle pipeline and enters the cold air inlet through the air cooling gas distributing pipe, the cooling compressed gas uniformly enters the inner cavity of the shell through the air inlet and air distributing cover, the cooling air passes through the gap between the motor stator and the shell and the main shaft, the cooling air is uniformly discharged from the air outlet and air distributing cover on the other side, and the discharged gas is discharged from the cold air outlet.
Furthermore, a one-way valve is arranged in the cold air outlet.
Furthermore, the number of the cold air outlets is at least two, and the cold air outlets are distributed in an axisymmetric manner.
The invention has the advantages that:
through setting up even wind device at casing both ends, with even the guide circulation in the casing of cooling air, discharge from both ends air conditioning gas outlet again, guaranteed cooling air in the inside equilibrium distribution all the time of casing, do not have the not good enough problem of local area cooling effect, through middle pipeline with partial compressed gas introduction casing in realize the cooling to motor, main shaft, journal bearing and axial bearing, improve the life of air compressor machine.
Drawings
FIG. 1 is a perspective view of the present invention;
FIG. 2 is a gas flow diagram of the present invention;
FIG. 3 is a cross-sectional view of the cold air inlet end of the present invention;
fig. 4 is a sectional view of a cold air outlet end of the present invention.
Drawing reference number
The air-cooling air distribution device comprises a shell (1), a motor stator (2), a main shaft (3), an air-cooling air inlet (4), an air-cooling air outlet (5), an air-homogenizing device (6), an air-guiding hole (7), an intermediate pipeline (8) and an air-cooling air distribution pipe (9).
Detailed Description
The following detailed description of the present invention will be made in conjunction with the accompanying drawings, but the following examples are merely illustrative of preferred embodiments, which are provided to assist understanding of the present invention, and are not to be construed as limiting the present invention.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout.
The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Example 1
The invention discloses an air cooling structure of a two-stage centrifugal air compressor as shown in fig. 1-4, wherein the centrifugal air compressor comprises a shell 1, a motor stator 2, a main shaft 3, a compression device arranged at the outer end of the main shaft 3, and an air cooling structure arranged in the shell 1, wherein the motor stator 2 and the main shaft 3 are embedded in the shell 1; two ends of the shell 1 are provided with a cold air inlet 4 and a cold air outlet 5, the number of the cold air outlets 5 is two, the two cold air outlets 5 are axially and symmetrically distributed, and one-way valves are arranged in the cold air outlets 5; the two ends of the inner cavity of the shell 1 are respectively provided with an air homogenizing device 6, the air homogenizing devices 6 are respectively arranged between the air conditioning air inlet 4 and the air conditioning air outlet 5, the air homogenizing devices 6 are provided with a plurality of air inducing holes 7, the air homogenizing devices 6 are back plates which are integrally formed with the shell, each air homogenizing device 6 comprises an air inlet air homogenizing cover and an air outlet air homogenizing cover, the centers of the air homogenizing devices 6 are symmetrically provided with a plurality of air inducing holes 7, and the distribution diameters of the air inducing holes on the air inlet air homogenizing covers are smaller than the distribution diameters of the air inducing holes on the air outlet air homogenizing covers;
the motor stator 2 and the main shaft 3 are arranged between the air homogenizing devices 6 at the two ends, and the two ends of the main shaft 3 penetrate through the air homogenizing devices 6.
And both ends of the spindle 3 of the centrifugal air compressor can be provided with compression devices which are communicated through an intermediate pipeline 8. The cold air inlet 4 is connected with an intermediate pipeline 8 through an air-cooled gas distributing pipe 9.
When embodied in practice
The cooling compressed gas is led out from the middle pipeline 8 and enters the cold air inlet 4 through the air-cooling gas distributing pipe 9, the cooling compressed gas enters the inner cavity of the shell 1 and then uniformly enters through the air guiding holes 7 on the air inlet air-homogenizing cover, the cooling air passes through the gap between the motor stator 2 and the shell 1 and the main shaft 3 and is uniformly discharged from the air guiding holes 7 on the air outlet air-homogenizing cover on the other side, and the discharged gas is discharged from the cold air outlet 5.
Embodiments of the present invention, it should be understood that the above-described embodiments are illustrative and should not be construed as limiting the present invention, and that those skilled in the art can make changes, modifications, substitutions and alterations to the above-described embodiments without departing from the principle and spirit of the present invention, and that all such changes in combination are intended to be within the scope of the present invention.
Claims (10)
1. The air cooling structure of the two-stage centrifugal air compressor comprises a shell (1), a motor stator (2), a main shaft (3), a compression device arranged at the outer end of the main shaft (3), and the air cooling structure arranged in the shell (1), wherein the motor stator (2) and the main shaft (3) are embedded in the shell (1); it is characterized in that the preparation method is characterized in that,
the air conditioner is characterized in that a cold air inlet (4) and a cold air outlet (5) are arranged at two ends of the shell (1), the number of the cold air outlets (5) is multiple, air distributing devices (6) are arranged at two ends of an inner cavity of the shell (1), the air distributing devices (6) are arranged between the cold air inlet (4) and the cold air outlet (5), and a plurality of air inducing holes (7) which are communicated with the cold air inlet (4) and the cold air outlet (5) are formed in the air distributing devices (6);
the motor stator (2) and the main shaft (3) are arranged between the air homogenizing devices (6) at the two ends, and the two ends of the main shaft (3) penetrate through the air homogenizing devices (6);
the cooling compressed gas passes through air inlet (4) get into evenly get into through induced air hole (7) of even wind device (6) behind casing (1) inner chamber, and the cooling air passes through in the clearance between motor stator (2) and casing (1) and main shaft (3), evenly discharges from induced air hole (7) of the even wind device (6) of opposite side, and the gas after the discharge is discharged from air conditioning gas outlet (5).
2. The air cooling structure of the two-stage centrifugal air compressor as claimed in claim 1, wherein: both ends of the main shaft (3) of the centrifugal air compressor can be provided with compression devices which are communicated through an intermediate pipeline (8).
3. The air cooling structure of the two-stage centrifugal air compressor as claimed in claim 2, wherein: the cold air inlet (4) is connected with the middle pipeline (8) through an air-cooling air distributing pipe (9).
4. The air cooling structure of the two-stage centrifugal air compressor as claimed in claim 3, wherein: the air uniformizing device (6) comprises an air inlet air uniformizing cover and an air outlet air uniformizing cover.
5. The air cooling structure of the two-stage centrifugal air compressor as claimed in claim 4, wherein: the air inlet and outlet air homogenizing covers are both back plates integrally formed with the shell.
6. The air cooling structure of the two-stage centrifugal air compressor as claimed in claim 4, wherein: the air inlet and outlet air homogenizing covers are provided with a plurality of air inducing holes (7) which are centrosymmetric.
7. The air cooling structure of the two-stage centrifugal air compressor as claimed in claim 6, wherein: the distribution diameter of the air guiding holes on the air inlet air-homogenizing cover is smaller than that of the air guiding holes on the air outlet air-homogenizing cover.
8. The air cooling structure of the two-stage centrifugal air compressor as claimed in claim 7, wherein: the cooling compressed gas is led out from the middle pipeline (8) and enters the cold air inlet (4) through the air-cooling air distributing pipe (9), the cooling compressed gas enters the inner cavity of the shell (1) and then uniformly enters through the air inlet holes (7) on the air inlet air-homogenizing cover, the cooling air passes through the gap between the motor stator (2) and the shell (1) and the main shaft (3), the cooling air is uniformly discharged from the air inlet holes (7) on the air outlet air-homogenizing cover on the other side, and the discharged gas is discharged from the cold air outlet (5).
9. The air cooling structure of the two-stage centrifugal air compressor as claimed in claim 1, wherein: a one-way valve is arranged in the cold air outlet (5).
10. The air cooling structure of the two-stage centrifugal air compressor as claimed in claim 1, wherein: the number of the cold air outlets (5) is at least two, and the cold air outlets (5) are distributed in an axial symmetry manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110346368.3A CN112922906A (en) | 2021-03-31 | 2021-03-31 | Air cooling structure of two-stage centrifugal air compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110346368.3A CN112922906A (en) | 2021-03-31 | 2021-03-31 | Air cooling structure of two-stage centrifugal air compressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112922906A true CN112922906A (en) | 2021-06-08 |
Family
ID=76176728
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110346368.3A Pending CN112922906A (en) | 2021-03-31 | 2021-03-31 | Air cooling structure of two-stage centrifugal air compressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112922906A (en) |
-
2021
- 2021-03-31 CN CN202110346368.3A patent/CN112922906A/en active Pending
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