CN112922905A

CN112922905A - Bearing air cooling structure of centrifugal air compressor

Info

Publication number: CN112922905A
Application number: CN202110346233.7A
Authority: CN
Inventors: 张会明; 张超; 徐树伍; 邢子义; 王升科; 谢元豪
Original assignee: Yantai Dongde Industrial Co Ltd
Current assignee: Yantai Dongde Industrial Co Ltd
Priority date: 2021-03-31
Filing date: 2021-03-31
Publication date: 2021-06-08

Abstract

A bearing air cooling system of a centrifugal air compressor is characterized in that cooling air directly enters a space between a thrust disc and a diffuser through an air inlet channel and leads to the outer side of an air axial air bearing, then is blown to a radial air bearing from a gap between the axial air bearing and a shell, enters the shell from a gap between the radial air bearing and the shell, passes through a gap between a motor stator and a main shaft as well as the shell to the tail end of the shell, and is discharged from an air outlet channel at the tail end of the shell. Set up inlet channel through opening on the diffuser and make the cooling air blow to axial bearing between can and cool down axial bearing, reentrant radial air bearing realizes that the bearing cools down the back and discharges from outlet channel again, sets up cooling gas of the same kind alone and carries out solitary cooling to the bearing, not only can be accurate also can supply the cooling in the motor simultaneously to the bearing cooling, improve the life of air compressor machine.

Description

Bearing air cooling structure of centrifugal air compressor

Technical Field

The invention relates to the technical field of cooling of air compressors, in particular to a bearing 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. The bipolar centrifugal air compressor has a higher requirement for the rotation of the rotor. The device that the air compressor machine during operation is scalded most easily under the rotation of so high-speed has the bearing in addition to the rotor, and centrifugal air compressor machine cooling system among the prior art is motor rotor stator cooling, and the bearing that the damage is overheated to the easiest does not have relevant cooling mode all the time. How to realize the cooling of the inside bearing of the air compressor accurately is the problem that needs to be solved at the present stage.

Disclosure of Invention

The invention aims to solve the problems and provides a bearing air cooling system of a centrifugal air compressor, wherein the centrifugal air compressor comprises a shell, a motor stator, a main shaft, an impeller, a diffuser and a volute which are arranged at the outer end of the main shaft from outside to inside in sequence, and the volute and the diffuser are hermetically connected with the shell; the main shaft with be equipped with radial air bearing between the casing, be equipped with the thrust dish between diffuser and the casing, the thrust dish cover in on the main shaft, just the thrust dish both sides all are equipped with axial bearing, bearing air cooling system includes inlet channel and air outlet channel, inlet channel locates on the diffuser, inlet channel is directional the axial air bearing outside, air outlet channel locates the casing is terminal.

Further, the thrust disc is of a boss type, and a gap is formed between the boss and the diffuser.

Further, the air inlet channel is a bent channel, and an outlet of the air inlet channel points to a position between the thrust disc and the diffuser.

Furthermore, gaps are formed among the axial air bearing, the diffuser and the shell, gaps are formed among the radial air bearing and the shell, and gaps are formed among the motor stator, the main shaft and the shell.

Further, cooling gas directly enters the space between the thrust disc and the diffuser and is led to the outer side of the air axial air bearing through the air inlet channel, then is blown to the radial air bearing from a gap between the axial air bearing and the shell, enters the shell from a gap between the radial air bearing and the shell, passes through a gap between the motor stator and the spindle as well as the shell to the tail end of the shell, and is discharged from an air outlet channel at the tail end of the shell.

Furthermore, a one-way valve is arranged in the air outlet channel.

Further, the inlet channel and the outlet channel are at least one.

Furthermore, the number of the air outlet channels is two, and the two air outlet channels are symmetrically distributed.

The invention has the advantages that:

set up inlet channel through opening on the diffuser and make the cooling air blow to axial bearing between can and cool down axial bearing, reentrant radial air bearing realizes that the bearing cools down the back and discharges from outlet channel again, sets up cooling gas of the same kind alone and carries out solitary cooling to the bearing, not only can be accurate also can supply the cooling in the motor simultaneously to the bearing cooling, improve the life of air compressor machine.

Drawings

FIG. 1 is a gas flow diagram of the present invention;

fig. 2 is a partially enlarged view of the intake passage of fig. 1.

Drawing reference number

The centrifugal fan comprises a shell (1), a motor stator (2), a main shaft (3), an impeller (4), a diffuser (5), a volute (6), a radial air bearing (7), a thrust disc (8), an axial air bearing (9), an air inlet channel (10) and an air outlet channel (11).

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 a bearing air cooling system of a centrifugal air compressor as shown in figures 1 and 2, wherein the centrifugal air compressor comprises a shell 1, a motor stator 2, a main shaft 3, an impeller 4, a diffuser 5 and a volute 6, which are arranged at the outer end of the main shaft 3 from outside to inside in sequence, and the volute 6 and the diffuser 5 are both connected with the shell 1 in a sealing way; the main shaft 3 with be equipped with radial air bearing 7 between the casing 1, be equipped with thrust disc 8 between diffuser 5 and the casing 1, thrust disc 8 overlap in on the main shaft 3, just 8 both sides of thrust disc all are equipped with axial air bearing 9, bearing air cooling system includes inlet channel 10 and outlet channel 11, inlet channel 10 is located on the diffuser 5, inlet channel 10 is directional the 9 outsides of axial air bearing, outlet channel 11 is located 1 is terminal in the casing, be equipped with the check valve in the outlet channel 11.

The thrust disc 8 is of a boss type, and a gap is formed between the boss and the diffuser 5. The air inlet passage 10 is a bent passage, and an outlet of the air inlet passage 10 points to a position between the thrust disc 8 and the diffuser 5.

The axial air bearing 9 and the diffuser 5 and the shell 1 are provided with gaps, a gap is arranged between the radial bearing and the shell 1, and the motor stator 2 and the spindle 3 and the shell 1 are provided with gaps.

The number of the air outlet channels 11 is two, and the two air outlet channels 11 are symmetrically distributed.

When embodied in practice

Cooling gas directly enters the space between the thrust disc 8 and the diffuser 5 and is led to the outer side of the air axial air bearing 9 through the air inlet channel 10, the cooling gas is discharged through the gap between the axial air bearing 9 and the diffuser 5, enters the space between the diffuser 5 and the shell 1, is blown to the radial air bearing 7 from the gap between the axial air bearing 9 and the shell 1, enters the shell 1 from the gap between the radial bearing and the shell 1, passes through the gap between the motor stator 2 and the spindle 3 as well as the shell 1 to the tail end of the shell 1, and is discharged from the air outlet channel 11 at the tail end of the shell 1.

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

1. A bearing air cooling system of a centrifugal air compressor comprises a shell (1), a motor stator (2), a main shaft (3), an impeller (4), a diffuser (5) and a volute (6), wherein the shell (1), the motor stator (2) and the main shaft (3) are sequentially arranged from outside to inside, the impeller (4), the diffuser (5) and the volute (6) are arranged at the outer end of the main shaft (3), and the volute (6) and the diffuser (5) are both in sealing connection with the shell (1); a radial air bearing (7) is arranged between the main shaft (3) and the shell (1), a thrust disc (8) is arranged between the diffuser (5) and the shell (1), the thrust disc (8) is sleeved on the main shaft (3), and axial air bearings (9) are arranged on two sides of the thrust disc (8), the radial air bearing is characterized in that the bearing air cooling system comprises an air inlet channel (10) and an air outlet channel (11), the air inlet channel (10) is arranged on the diffuser (5), the air inlet channel (10) is a bent channel, the air inlet channel (10) points to the outer side of the axial air bearing (9), and the air outlet channel (11) is arranged at the tail end of the shell (1);

cooling gas directly enters the outer side of the axial air bearing (9) through the air inlet channel (10), is discharged from a gap between the axial air bearing (9) and the diffuser (5), enters a space between the diffuser (5) and the shell (1), is blown to the radial air bearing (7) from a gap between the axial air bearing (9) and the shell (1), enters the shell (1) from the radial air bearing (7) and the gap of the shell (1), passes through the gap between the motor stator (2) and the spindle (3) and the shell (1) to the tail end of the shell (1), and is discharged from an air outlet channel (11) at the tail end of the shell (1).

2. The bearing air cooling system of the centrifugal air compressor as claimed in claim 1, wherein: the thrust disc (8) is of a boss type, and a gap is formed between the boss and the diffuser (5).

3. The bearing air cooling system of the centrifugal air compressor as claimed in claim 1, wherein: and the outlet of the air inlet channel (10) points to the position between the thrust disc (8) and the diffuser (5).

4. The bearing air cooling system of the centrifugal air compressor as claimed in claim 1, wherein: gaps are reserved between the axial air bearing (9) and the diffuser (5) and between the axial air bearing and the shell (1).

5. The bearing air cooling system of the centrifugal air compressor as claimed in claim 1, wherein: a gap is arranged between the radial air bearing (7) and the shell (1).

6. The bearing air cooling system of the centrifugal air compressor as claimed in claim 1, wherein: and gaps are formed among the motor stator (2), the main shaft (3) and the shell (1).

7. The bearing air cooling system of the centrifugal air compressor as claimed in claim 2, wherein: cooling gas directly enters the space between the thrust disc (8) and the diffuser (5) through the gas inlet channel (10) and is led to the outer side of the air axial air bearing (9), the cooling gas is discharged from the gap between the axial air bearing (9) and the diffuser (5), enters the space between the diffuser (5) and the shell (1), is blown to the radial air bearing (7) from the gap between the axial air bearing (9) and the shell (1), enters the interior of the shell (1) from the gap between the radial air bearing (7) and the shell (1), passes through the gap between the motor stator (2) and the spindle (3) and the shell (1) to the tail end of the shell (1), and is discharged from the gas outlet channel (11) at the tail end of the shell (1).

8. The bearing air cooling system of the centrifugal air compressor as claimed in claim 1, wherein: a one-way valve is arranged in the air outlet channel (11).

9. The bearing air cooling system of the centrifugal air compressor as claimed in claim 1, wherein: the number of the air inlet channels (10) and the number of the air outlet channels (11) are at least one.

10. The bearing air cooling system of the centrifugal air compressor as claimed in claim 1, wherein: the number of the air outlet channels (11) is two, and the two air outlet channels (11) are symmetrically distributed.