CN109707638B - Bearing and sealing integrated small and miniature centrifugal compressor - Google Patents

Bearing and sealing integrated small and miniature centrifugal compressor Download PDF

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Publication number
CN109707638B
CN109707638B CN201910089279.8A CN201910089279A CN109707638B CN 109707638 B CN109707638 B CN 109707638B CN 201910089279 A CN201910089279 A CN 201910089279A CN 109707638 B CN109707638 B CN 109707638B
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static ring
ring
axial
axial static
shell
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CN109707638A (en
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唐斌
杨启超
刘广彬
赵远扬
李连生
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Qingdao University of Science and Technology
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Qingdao University of Science and Technology
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Abstract

The invention discloses a bearing and sealing integrated small and miniature centrifugal compressor, which relates to the technical field of compressor design and comprises the following components: a housing; the main shaft is internally provided with an airflow through hole communicated with the exhaust port of the shell; a rotor; a stator; the first axial static ring is provided with at least two circumference vent holes A along the circumference; the second axial static ring is provided with at least one circle of vent holes B along the circumference; the first axial static ring, the second axial static ring, the dynamic ring and the radial static ring form a first channel, and the second axial static ring and the centrifugal impeller form a second channel; the exhaust port of the centrifugal impeller is communicated with the vent hole A through the second channel, and the vent hole A is communicated with the vent hole B through the first channel. The invention has the advantages that radial and axial thrust bearings are not required to be installed, the compressor is completely free of oil and a lubricating system is not required, so that the structure of the compressor is simpler and more compact, and the miniaturization of the compressor is facilitated; the airflow circulating channel takes away heat generated in the working process of the motor, and the effect of internal circulation cooling is achieved.

Description

Bearing and sealing integrated small and miniature centrifugal compressor
Technical Field
The invention relates to the technical field of compressor design, in particular to a bearing and seal integrated small and miniature centrifugal compressor.
Background
With the development of electronic technologies such as integrated circuits, the heat flux density of modern high heat flow devices is increasing, the passive cooling method cannot meet the heat dissipation requirement, and a refrigeration system is required to ensure the normal operation of the electronic system. In many situations, such as mobile or portable electronic systems, chip cooling, radar cooling, and defense military industry, there is a strong need for a lightweight, small and miniature refrigeration system due to space and weight limitations.
The compressor is the key equipment of the core of the refrigerating system, the centrifugal compressor is used as the rotary turbine machinery, and the centrifugal compressor has the advantages of compact and simple structure, high efficiency and reliability, long service life cycle and the like, and is an ideal small micro compressor model. However, in order to obtain high discharge pressure in a small-sized centrifugal compressor to meet the requirements of a refrigeration system, the rotating speed of the compressor must be increased, and the shaft end sealing leakage must be reduced, which cannot be achieved by the existing technology.
The current small micro compressor mainly comprises a rolling rotor type compressor and a linear piston type compressor, and the principle is completely different from that of a centrifugal compressor. The existing high-speed centrifugal compressor supported by a magnetic suspension bearing and a gas bearing cannot be miniaturized, the magnetic suspension bearing is complex in structure and needs an independent control system, and the static pressure gas bearing needs an independent compressed gas source for gas supply, so that the miniaturization is limited; the dynamic pressure gas bearing has a complex structure, has very high requirements on materials and processing technology, and cannot ensure reliability and service life. In addition, the technical problem of shaft end sealing of the compressor is a bottleneck for restricting the development of the centrifugal compressor to small miniaturization. The centrifugal compressor technology has not yet been able to meet the requirements of small and miniature refrigeration systems.
The working principle of the rolling rotor compressor and the working principle of the linear piston compressor determine that the miniaturization cannot be further realized, the two compressors have low operating efficiency, wearing parts are arranged in parts and need to be replaced periodically, and the reliability and the service life cannot be ensured.
The centrifugal compressor has simple structure, no easily damaged parts, high reliability and long service life. However, the centrifugal compressor can be miniaturized only by high rotation speed, and the ultra-high speed miniaturization of the centrifugal compressor cannot be realized by the existing magnetic suspension bearing, gas bearing and sealing technology.
Disclosure of Invention
The invention aims to solve the problems of high-speed bearing and gas sealing technology and designs a small and miniature centrifugal compressor with integrated bearing and sealing.
In order to achieve the above object, the present invention provides a bearing and seal integrated small-sized centrifugal compressor, comprising: a housing provided with an air inlet and an air outlet; the main shaft is rotatably arranged in the shell, and an airflow through hole communicated with the exhaust port of the shell is formed in the main shaft; the rotor is fixedly arranged on the main shaft and is positioned in the shell; the stator is fixedly arranged in the shell and is opposite to the rotor; the first axial static ring is fixedly arranged in the shell and positioned on the outer side of the rotor, and at least two circumference vent holes A are formed in the first axial static ring along the circumference; the second axial static ring is fixedly arranged in the shell and positioned outside the first axial static ring, and at least one circle of vent holes B are formed in the second axial static ring along the circumference; the movable ring is fixedly arranged on the main shaft and is positioned between the first axial static ring and the second axial static ring; the radial static ring is fixedly arranged on the shell, the bottom end of the radial static ring is connected with the first axial static ring, and the top end of the radial static ring is connected with the second axial static ring; the centrifugal impeller is fixedly arranged on the main shaft, positioned in the shell and positioned outside the first axial static ring, an air inlet of the centrifugal impeller is arranged opposite to an air inlet of the shell, and an air outlet of the centrifugal impeller is arranged opposite to an air outlet of the shell; the centrifugal impeller comprises a first axial static ring, a second axial static ring, a dynamic ring and a radial static ring, wherein the first axial static ring, the second axial static ring, the dynamic ring and the radial static ring form a first channel; the exhaust port of the centrifugal impeller is communicated with the vent hole A through the second channel, and the vent hole A is communicated with the vent hole B through the first channel.
Furthermore, the second axial static ring is provided with a circle of vent holes B along the circumference, the outer diameter of the second axial static ring is D4, the diameter of the circle center of the vent hole B is D5,
still further, the first axial static ring is provided with vent holes A along the circumference in two circles, the outer diameter of the first axial static ring is D1, the diameter of the circle center of the vent hole A on the outer side is D2, the diameter of the circle center of the vent hole A on the inner side is D3,
further, D3 ═ D5.
Furthermore, the end surface and the cylindrical surface of the movable ring are both provided with dynamic pressure grooves.
Further, the clearance between the radial static ring and the dynamic ring is larger than the clearance between the main shaft and the first axial static ring.
Further, the clearance between the radial static ring and the dynamic ring is larger than the clearance between the main shaft and the second axial static ring.
Further, the casing includes shell and base, centrifugal impeller set up in the shell, the second axial quiet ring set up in the base.
Furthermore, the rotating ring is made of hard alloy.
Still further, the hardness of the material of the first axial static ring and the second axial static ring is lower than that of the material of the dynamic ring.
The invention has the beneficial effects that:
1. radial and axial thrust bearings are not required to be installed, the compressor is completely free of oil, and a lubricating system is not required, so that the structure of the compressor is simpler and more compact, and the miniaturization of the compressor is facilitated;
2. an air film support is formed between the dynamic ring and the static ring, and after the air film support is balanced with axial load and radial load of a compressor rotor, the compressor rotor is in an air suspension state, no solid contact friction loss exists, and the compressor can reach ultrahigh rotating speed;
3. the airflow circulating channel takes away heat generated in the working process of the motor, and the effect of internal circulation cooling is achieved.
Drawings
Fig. 1 is a schematic structural view of a compressor of the present application.
In the above figures, 1, a housing; 11. a housing; 12. a base; 2. a main shaft; 21. an airflow through hole; 22. (ii) a 3. A rotor; 4. a stator; 5. a second axial stationary ring; 51. a vent hole A; 6. a second axial stationary ring; 61. a vent hole B; 7. a moving ring; 8. a radial stationary ring; 9. and (4) centrifuging the impeller.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects according to the present invention with reference to the accompanying drawings and preferred embodiments is as follows:
a bearing and seal integrated small-sized centrifugal compressor is shown in figure 1 and comprises a shell 1, a main shaft 2, a rotor 3, a stator 4, a first axial static ring 5, a second axial static ring 6, a rotating ring 7, a radial static ring 8 and a centrifugal impeller 9.
The housing 1 of the compressor is provided with an inlet and an outlet. The main shaft 2 is rotatably arranged in the shell 1, an air flow hole 21 is formed in the main shaft 2, one end of the air flow hole 21 is communicated with an air outlet of the shell 1, and the other end of the air flow hole 21 is communicated with a cavity in the shell 1. Rotor 3 is fixed to be set up on main shaft 2, and stator 4 is fixed to be set up in casing 1, and rotor 3 and stator 4 all set up in casing 1, and stator 4 sets up with rotor 3 relatively.
The first axial stationary ring 5 is fixedly arranged in the housing 1, the first axial stationary ring 5 is positioned outside the rotor 3, and the first axial stationary ring 5 is circumferentially provided with two circumferential vent holes a 51. The second axial static ring 6 is fixedly arranged in the shell 1, the second axial static ring 6 is positioned outside the first axial static ring 5, and the second axial static ring 6 is provided with a circle of vent holes B61 along the circumference.
The rotating ring 7 is fixedly arranged on the main shaft 2, and the rotating ring 7 is positioned between the first axial static ring 5 and the second axial static ring 6. Radial quiet ring 8 is fixed to be set up on casing 1, and radial quiet ring 8's bottom is connected with first axial quiet ring 5, and radial quiet ring 8's top is connected with second axial quiet ring 6. The first axial static ring 5, the second axial static ring 6, the movable ring 7 and the radial static ring 8 form a first passage, and the vent hole A51 is communicated with the vent hole B61 through the first passage, and the first passage is a small-gap passage.
The centrifugal impeller 9 is fixedly arranged on the main shaft 2, the centrifugal impeller 9 is arranged in the shell 1, and the centrifugal impeller 9 is positioned outside the first axial static ring 5. The air inlet and outlet of the centrifugal impeller 9 are respectively opposite to the air inlet and outlet of the shell 1. Most of the gas enters the compressor cavity from the gas inlet of the shell 1, is accelerated and boosted by the centrifugal impeller 9 and then is discharged from the gas outlet of the shell 1. The second axial stationary ring 6 and the centrifugal impeller 9 form a second passage, and the exhaust port of the centrifugal impeller 9 is communicated with the vent hole A51 through the second passage.
During use, the rotor 3 drives the spindle 2 to rotate, the moving ring 7 and the centrifugal impeller 9 rotate along with the spindle 2, a small part of gas flows out from an exhaust port of the centrifugal impeller 9 and then directly enters the second channel, then enters the first channel through the vent hole B61, the gas pressure close to the radial static ring 8 is gradually increased during rotation, then flows out from the outer vent hole A51 and enters a gap between the rotor 3 and the stator 4 with lower gas pressure, a part of gas enters the gap between the static ring 5 and the moving ring 7 from the inner vent hole A51, the rotation pressure of the follower ring is increased and flows out from the outer vent hole A51, and the gas flow can flow from the gas flow through hole 21 to a gas inlet of the shell 1 due to the gas flow through hole 21 formed in the spindle 2. The flow process is an airflow circulation channel, and the airflow channel can take away heat generated in the working process of the motor, so that the effect of internal circulation cooling is achieved.
In the process that the movable ring 7 rotates along with the main shaft 2, dynamic pressure effect can be generated between the upper end surface and the lower end surface of the movable ring 7, the circumferential cylindrical surface and the surface of the radial static ring 8, and an air film is formed. In order to improve the dynamic pressure effect, the end surface and the cylindrical surface of the movable ring 7 are both provided with dynamic pressure grooves. The air film enables a compressor rotor system (comprising the rotating shaft 2, the motor rotor 3, the moving ring 7 and the centrifugal impeller 9) to be in a suspension state, no solid contact friction loss exists, ultrahigh rotating speed can be achieved, meanwhile, the pressure of the air film is higher than the pressure in a cavity where the motor rotor 3 is located, and the sealing effect similar to dry air sealing is achieved; the compressor adopts a totally enclosed structure, only has one air inlet and one air outlet, does not need other lubricating and cooling systems, and avoids the external leakage of the shaft end, namely, no external leakage.
Preferably, the outer diameter of the second axial static ring 6 is D4, the diameter of the circle center of the vent hole B61 is D5,the outer diameter of the first axial static ring 5 is D1, the diameter of the circle center of the outer air vent A51 is D2, the diameter of the circle center of the inner air vent A51 is D3,on the basis of the above, the design can stabilize the formation of the gas film by using D3-D5.
In addition, the clearance between the radial static ring 8 and the dynamic ring 7 is larger than the clearance between the main shaft 2 and the first axial static ring 5; the clearance between the radial static ring 8 and the dynamic ring 7 is larger than the clearance between the main shaft 2 and the second axial static ring 6, and the design avoids the dynamic ring 7 from impacting the radial static ring 8.
First axial quiet ring 5, second axial quiet ring 6 and rotating ring 7 can short time rub in the compressor start-up or shut down in-process, for reducing coefficient of friction, reduce the friction loss, the quiet ring material soft or hard is paired, and rotating ring 7 adopts carbide, and first axial quiet ring 5 and the quiet ring 6 material hardness of second are all less than rotating ring 7 to carry out the spraying on the surface of first axial quiet ring 5, second axial quiet ring 6 and rotating ring 7, promote surperficial lubricating property and wearability.
The housing 1 comprises a casing 11 and a base 12, the centrifugal impeller 9 being arranged in the casing 11 and the second axial stationary ring 6 being arranged in the base 12. This design facilitates installation of the compressor.
The invention has been described above with reference to a preferred embodiment, but the scope of protection of the invention is not limited thereto, and various modifications can be made and equivalents can be substituted for elements thereof without departing from the scope of the invention, and features mentioned in the various embodiments can be combined in any way as long as there is no structural conflict, and any reference sign in the claims should not be construed as limiting the claim concerned, from which the embodiment is to be regarded as being exemplary and non-limiting in any way. Therefore, all technical solutions that fall within the scope of the claims are within the scope of the present invention.

Claims (6)

1. A bearing and seal integrated miniature centrifugal compressor, comprising:
a housing (1) provided with an air inlet and an air outlet;
the main shaft (2) is rotatably arranged in the shell (1), and an airflow through hole (21) communicated with an air inlet of the shell (1) is formed in the main shaft (2);
the motor rotor (3) is fixedly arranged on the main shaft (2) and is positioned in the shell (1);
the motor stator (4) is fixedly arranged in the shell (1) and is opposite to the motor rotor (3);
a first axial static ring (5) fixedly arranged in the shell (1) and positioned outside the motor rotor (3), wherein the first axial static ring (5) is provided with two-circumference vent holes A (51) along the circumference, and the outer diameter of the first axial static ring (5) isThe diameter of the circle center of the vent hole A (51) at the outer side isThe diameter of the circle center of the vent hole A (51) at the inner side is(ii) a A second axial static ring (6) fixedly arranged in the shell (1) and positioned at the outer side of the first axial static ring (5), wherein the second axial static ring (6) is provided with a circle of vent holes B (61) along the circumference, and the outer diameter of the second axial static ring (6) isThe diameter of the circle center of the vent hole B (61) is
The movable ring (7) is fixedly arranged on the main shaft (2) and is positioned between the first axial static ring (5) and the second axial static ring (6); the end surface and the cylindrical surface of the movable ring (7) are both provided with dynamic pressure grooves;
the radial static ring (8) is fixedly arranged on the shell (1), the bottom end of the radial static ring is connected with the first axial static ring (5), and the top end of the radial static ring is connected with the second axial static ring (6); and
the centrifugal impeller (9) is fixedly arranged on the main shaft (2), is positioned in the shell (1) and is positioned outside the first axial static ring (5), the air inlet of the centrifugal impeller (9) is opposite to the air inlet of the shell (1), and the air outlet of the centrifugal impeller (9) is opposite to the air outlet of the shell (1);
the centrifugal impeller comprises a first axial static ring (5), a second axial static ring (6), a dynamic ring (7) and a radial static ring (8), wherein a first channel is formed by the first axial static ring (5), the second axial static ring (6) and a centrifugal impeller (9); the exhaust port of the centrifugal impeller (9) is communicated with the vent hole B (61) through a second channel, and the vent hole A (51) is communicated with the vent hole B (61) through a first channel.
2. A bearing and seal integrated small micro centrifugal compressor according to claim 1, characterized in that the clearance between the radial static ring (8) and the dynamic ring (7) is larger than the clearance between the main shaft (2) and the first axial static ring (5).
3. A bearing and seal integrated small-sized centrifugal compressor according to claim 1, characterized in that the clearance between the radial static ring (8) and the dynamic ring (7) is larger than the clearance between the main shaft (2) and the second axial static ring (6).
4. A bearing and seal integrated miniature centrifugal compressor according to claim 1, characterized in that said housing (1) comprises a casing (11) and a base (12), said centrifugal impeller (9) being arranged in said casing (11), said second axial stationary ring (6) being arranged in said base (12).
5. Small centrifugal compressor with integrated bearing and seal according to claim 1, characterized by the fact that the rotating ring (7) is made of cemented carbide.
6. The bearing and seal integrated miniature centrifugal compressor according to claim 1 or 5, characterized in that the material hardness of the first axial static ring (5) and the second axial static ring (6) is lower than that of the dynamic ring (7).
CN201910089279.8A 2019-01-30 2019-01-30 Bearing and sealing integrated small and miniature centrifugal compressor Active CN109707638B (en)

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CN111285422B (en) * 2020-02-15 2022-04-12 青岛科技大学 Integrated form MVR evaporation concentration device

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