CN202280648U

CN202280648U - Bearing for centrifugal compressor, centrifugal compressor and air conditioning system

Info

Publication number: CN202280648U
Application number: CN201120425286XU
Authority: CN
Inventors: 张治平; 钟瑞兴; 谢蓉; 蒋楠; 蒋彩云; 傅鹏; 闫秀兵
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2011-10-31
Filing date: 2011-10-31
Publication date: 2012-06-20
Anticipated expiration: 2021-10-31

Abstract

The utility model discloses a bearing for centrifugal compressor, this bearing center have the centre bore be equipped with 1 row at least along the air supply hole of circumference on the bearing, this air supply hole with the centre bore intercommunication, and be equipped with the air cavity on the bearing inner wall in this air supply hole exit. The utility model discloses a bearing for centrifugal compressor utilizes the high-pressure gaseous state refrigerant of drawing forth from the condenser to lubricate the bearing motion pair at motor shaft both ends, makes the compressor adapt to high and extremely low speed operation simultaneously, increases the operation scope of compressor, utilizes the refrigerant to cool down the bearing motion pair simultaneously, thoroughly solves the vice temperature rise problem of bearing, improves operation stability. And simultaneously, the utility model also discloses a centrifugal compressor who uses above-mentioned bearing and the air conditioning system who uses above-mentioned bearing.

Description

A kind of centrifugal compressor is with bearing, centrifugal compressor and air-conditioning system

Technical field

The utility model relates to bearing, and especially a kind of centrifugal compressor is used bearing, and the centrifugal compressor that uses this bearing, and the air-conditioning system of using this bearing.

Background technique

At present, the motor shaft of existing centrifugal compressor adopts hydrodynamic sliding bearing to support usually, adopts lipid lubricant oil to be lubricated; The shortcoming of its existence is: (1) adopts lubricant oil to be lubricated; Under the situation that rotating ratio is lower when start and stop, it is lubricated to be difficult to form effective oil film wedge between the bearing movable pair, thereby makes that wearing and tearing are comparatively serious; Though adopt additional babbit metal bearing lining to carry out the motor shaft protection; But this has also caused the bearing life reduction simultaneously, and operation is comparatively complicated when changing the bearing bush material, and cost is also higher; (2) in addition, under the situation of motor shaft high speed rotating, power loss is bigger, and the secondary temperature rise phenomenon of bearing movable also is difficult to resolve determines, and lubricating oil temperature rises and causes its viscosity to descend, thereby also can reduce lubrication effect.

Summary of the invention

The utility model first technical problem to be solved is, provides a kind of centrifugal compressor to use bearing, its can simultaneous adaptation low speed with run up, long service life, noise is little with vibration.

The utility model second technical problem to be solved is, a kind of centrifugal compressor that uses above-mentioned bearing is provided.

The utility model the 3rd technical problem to be solved is, a kind of air-conditioning system of using above-mentioned bearing is provided.

The technological scheme that above-mentioned first technical problem that solves the utility model adopts is: a kind of centrifugal compressor is used bearing; This bearing centre has center hole; On said bearing, be provided with the air vent of at least 1 row along circumferential array; This air vent is communicated with said center hole, and on the bearing inner wall in this air vent outlet port, is provided with air cavity.

As the preferred embodiment of technique scheme, said air cavity is a plurality of, and a plurality of air cavitys circumferentially are provided with along said bearing.

As the preferred embodiment of technique scheme, each arranges said air vent along the circumferential spaced set of said bearing, and a plurality of said air cavitys are along the circumferential spaced set of said bearing.

As the preferred embodiment of technique scheme, the number of the said air vent outlet in each said air cavity is identical.

As the preferred embodiment of technique scheme, said air cavity is the polygonal groove.

As the preferred embodiment of technique scheme, said bearing outer wall is provided with the annular gas tank that is communicated with said air vent.

As the preferred embodiment of technique scheme, said bearing comprises bearing shell and the bearing bush of being located at inner surface of bearing bush.

As the preferred embodiment of technique scheme, the material of said bearing bush is an engineering ceramic material.

The technological scheme that above-mentioned second technical problem that solve the utility model adopts is: a kind of compressor; It comprises motor and described bearing; This motor has motor shaft, and the axle journal of this motor shaft is loaded in the center hole of said bearing, and said axle journal and said center hole wall form the gap; The one end sealing of this gap and said journal outer end homonymy, the other end is communicated with the inner chamber of motor.

The technological scheme that above-mentioned the 3rd technical problem that solve the utility model adopts is: a kind of air-conditioning system, and it comprises condenser and described bearing, the import of the air vent of the relief opening of condenser on pipeline and said bearing is communicated with.

The centrifugal compressor of the utility model is used bearing; On bearing, offer a plurality of air vents; The high-pressure gaseous refrigerant of drawing from condenser passes through to get into the gap between bearing and the axle journal after air vent and the air cavity throttling; In the gap, form the static pressure air film of bearing load, the bearing movable pair is lubricated, the refrigerant of lubricated usefulness refrigerant with cooling motor from the end entering motor cavity in gap together reclaims.Compared with prior art, the utility model has the advantages that:

(1) the high-pressure gaseous refrigerant that adopts condenser to draw replaces lubricant oil, and the bearing movable pair at compressor electric motor axle two ends is lubricated, and makes the motor can smooth operation under high and extremely low rotating speed, reduces noise and vibration; And the high-pressure gaseous refrigerant is through after the throttling, and a large amount of heats are taken away in evaporation, can lower the temperature to the bearing movable pair, has solved the secondary problem of temperature rise of bearing movable; In addition, adopt refrigerant to replace lubricant oil, effectively reduce the amount of the lubricant oil that mixes in the refrigerant circulation; Reduce the number of times that refrigerant is purified; The refrigerant of lubricated usefulness enters directly that the refrigerant with cooling motor together reclaims in the motor cavity, has reduced the return line of motor, makes the outward appearance of compressor more succinct;

(2) on bearing, offer the air vent of at least 1 row, guarantee radially bearing capacity along circumferential array;

(3) the processing polygonal groove shaped air cavity in the air vent outlet port plays restriction effect, increases gas film stiffness, improves gas bearing stability;

(4) on bearing outer wall, be provided with annular gas tank, can make the refrigerant that gets into air vent keep bigger speed;

(5) engineering ceramic material that bearing bush working strength and hardness are higher replaces Babbitt, effectively increases bearing life; And, adopt stupalith to reduce bearing quality, there are some researches show that the quality situation that reduces bearing quality and reduce axle is roughly the same, therefore use the material of this little proportion of stupalith, also beneficial to the run stability of motor.

Description of drawings

Fig. 1 is the structural representation of the utility model embodiment 1 centrifugal compressor with bearing;

Fig. 2 is the erection drawing of the utility model embodiment 1 centrifugal compressor with bearing and axle journal;

Fig. 3 is the structural representation of the utility model embodiment 2 centrifugal compressor with bearing;

Fig. 4 the utility model embodiment 3 centrifugal compressor is with the structural representation of bearing.

Description of reference numerals: 1-bearing, 1a-center hole, 2-bearing shell, 3-bearing bush, 4-air vent, 5-air cavity, 6-annular gas tank, 7-axle journal, 8-gap.

Embodiment

Embodiment to the utility model is elaborated below in conjunction with accompanying drawing:

Embodiment 1

As shown in Figure 1, centrifugal compressor comprises bearing shell 2 and the bearing bush 3 of being located at bearing shell 2 internal surfaces with bearing 1, and the material of bearing bush 3 is an engineering ceramic material.There is center hole 1a at the center of bearing 1.On bearing 1, be processed with two rows (8 of every rows) along the air vent of circumferentially equidistantly arranging that radially runs through 4.Circumferentially equidistantly be provided with 8 air cavitys 5 in the bearing inner wall upper edge, air cavity 5 is rectangular recess.As can be seen from the figure, 4 outlets of 8 air vents among every row lay respectively in 8 air cavitys 5.Because air vent 4 and air cavity 5 are all along the circumferential spaced set of bearing, and the number of 4 outlets of the air vent in each air cavity 5 is identical, can guarantee provides even axial bearing capacity for axle journal.On bearing 1 outer circumferential face of two row's air vents, 4 inlets, be provided with annular gas tank 6.

As shown in Figure 2, the axle journal 7 of compressor electric motor axle is loaded in the center hole 1a of bearing 1, and axle journal 7 forms gap 8 with center hole 1a wall, the end sealing of this gap 8 and axle journal 7 outer end homonymies, and the other end is communicated with the inner chamber of motor.

During use; The import of the relief opening of the condenser of the air-conditioning system air vent 4 on pipeline and bearing 1 is communicated with; The high-pressure gaseous refrigerant of drawing in the condenser passes through to get into the gap 8 between bearing 1 and the axle journal 7 after air vent 4 and air cavity 5 throttlings; In gap 8, form the static pressure air film of bearing load, bearing 1 kinematic pair is lubricated, the refrigerant of lubricated usefulness refrigerant with cooling motor from the end entering motor cavity in gap 8 together reclaims.

In sum, the centrifugal compressor of present embodiment has the following advantages with bearing 1:

(2) on bearing, offer 1 to 3 row along the air vent of circumferentially equidistantly arranging, guarantee radially bearing capacity;

(3) air cavity of processing rectangular cross-section in the air vent outlet port plays restriction effect, increases gas film stiffness, improves gas bearing stability;

(4) on the outer circumferential face of bearing, be provided with annular gas tank, can make the refrigerant that gets into air vent keep bigger speed;

Embodiment 2

As shown in Figure 3, different with embodiment 1 is on bearing 1, to be processed with a row along the air vent of circumferentially equidistantly arranging that radially runs through 4.Compare with embodiment 1 bearing, the bearing structure of present embodiment is simple, is convenient to processing.

Embodiment 3

As shown in Figure 4, different with embodiment 1 is on bearing 1, to be processed with three rows along the air vent of circumferentially equidistantly arranging that radially runs through 4.Compare with embodiment 1 bearing, the bearing of present embodiment can guarantee for axle journal more evenly axial bearing capacity to be provided.

More than be merely the specific embodiment of the utility model, do not limit the protection domain of the utility model with this; Do not violate any replacement and the improvement of being done on the basis of the utility model design, all belonging to the protection domain of the utility model.

Claims

1. a centrifugal compressor is used bearing; This bearing centre has center hole; It is characterized in that: on said bearing, be provided with the air vent of at least 1 row along circumferential array, this air vent is communicated with said center hole, and on the bearing inner wall in this air vent outlet port, is provided with air cavity.

2. centrifugal compressor according to claim 1 is used bearing, it is characterized in that: said air cavity is a plurality of, and a plurality of air cavitys circumferentially are provided with along said bearing.

3. centrifugal compressor according to claim 2 is used bearing, it is characterized in that: said air vent is along the circumferential spaced set of said bearing, and said air cavity is along the circumferential spaced set of said bearing.

4. centrifugal compressor according to claim 3 is used bearing, it is characterized in that: the number of the said air vent outlet in each said air cavity is identical.

5. centrifugal compressor according to claim 1 is used bearing, it is characterized in that: said air cavity is the polygonal groove.

6. centrifugal compressor according to claim 1 is used bearing, it is characterized in that: said bearing outer wall is provided with the annular gas tank that is communicated with said air vent.

7. use bearing according to each described centrifugal compressor of claim 1 to 6, it is characterized in that: said bearing comprises bearing shell and the bearing bush of being located at inner surface of bearing bush.

8. centrifugal compressor according to claim 7 is used bearing, it is characterized in that: the material of said bearing bush is an engineering ceramic material.

9. compressor; It is characterized in that: comprise motor and like each described bearing of claim 1 to 8; This motor has motor shaft, and the axle journal of this motor shaft is loaded in the center hole of said bearing, and said axle journal and said center hole wall form the gap; The one end sealing of this gap and said journal outer end homonymy, the other end is communicated with the inner chamber of motor.

10. air-conditioning system is characterized in that: comprise condenser and like each described bearing of claim 1 to 8, the import of the air vent of the relief opening of condenser on pipeline and said bearing is communicated with.