CN214118558U - Centrifugal air compressor with high-speed motor - Google Patents
Centrifugal air compressor with high-speed motor Download PDFInfo
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- CN214118558U CN214118558U CN202023095456.0U CN202023095456U CN214118558U CN 214118558 U CN214118558 U CN 214118558U CN 202023095456 U CN202023095456 U CN 202023095456U CN 214118558 U CN214118558 U CN 214118558U
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- impeller
- air compressor
- speed motor
- shell
- centrifugal air
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Abstract
The utility model provides a high-speed motor centrifugal air compressor, which comprises a shell and a rotating shaft, wherein an air seal and a bearing are arranged between the shell and the rotating shaft; one side of the shell is sequentially provided with an expander, a volute and an impeller, and one side of the impeller, which faces the shell, is provided with at least one annular groove; at least one toothed ring extending towards the impeller side is arranged on one side of the shell towards the impeller, and the free end of the toothed ring and the annular groove are arranged in a staggered mode. The utility model provides a high-speed motor centrifugal air compressor is through increasing gaseous fluid friction on the one hand, increase flow resistance and dissipation loss, thereby make the leakage quantity through the seal clearance reduce, reduce the heat influence that steam caused to the bearing, on the other hand is through setting up first seal coating and the sealed soft coating of second between casing and impeller and atmoseal and rotation axis respectively, reach the effect that further reduction gas leaked to the bearing, thereby shorten bearing length, make compressor structure more compact.
Description
Technical Field
The utility model relates to an air compressor, in particular to centrifugal air compressor of high-speed motor.
Background
As shown in fig. 1, a rotating shaft 1 and a bearing 7 are provided inside a compressor in the prior art, a stator 8 and a rotor 9 are provided on the rotating shaft 1, an impeller 2 ', a volute 3 and an expander 4 are provided at the other end of the rotating shaft 1, and a gas seal 6 is provided between a housing 5' and the rotating shaft 1. In the prior art, magnetic suspension or air suspension bearings are usually adopted, and the distance between the air seal 6 and the rotating shaft 1 is 0.2-0.25 mm, so that the axial movement distance of the air seal 6 is 0.15-0.2 mm, and gas leakage is easily caused. On the other hand, the leaked high-temperature gas heats the bearing 7 to exceed the heat-resistant temperature of the air-levitation or magnetic-levitation bearing. Therefore, the bearing 7 needs to be far away from the impeller 2', so that the whole rotating part of the motor is forced to be lengthened, the critical rotating speed of the rotor is reduced, and the compressor cannot obtain sufficient output pressure.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a centrifugal air compressor of high-speed motor in order to overcome the defect that has gas leakage and the whole overlength of motor commentaries on classics portion among the prior art.
The utility model discloses an above-mentioned technical problem is solved through following technical scheme:
a high-speed motor centrifugal air compressor comprises a shell and a rotating shaft arranged in the shell in a penetrating mode, wherein an air seal and a bearing are arranged between the shell and the rotating shaft; the volute casing is characterized in that at least one annular groove is formed in one side, facing the casing, of the impeller; at least one toothed ring extending towards the impeller side is arranged on one side of the shell towards the impeller, and the free end of the toothed ring and the annular groove are arranged in a staggered mode.
Preferably, the longitudinal section of the gear ring is rectangular, and the included angle between the central axis of the rectangle and the central axis of the rotating shaft ranges from 60 degrees to 90 degrees.
Preferably, a first seal coating is provided on a portion of the outer circumferential surface of the rotary shaft that is opposite to the gas seal.
Preferably, the thickness of the first seal coating is in the range of 0.08mm to 0.12 mm.
Preferably, the first sealing coating is made of polytetrafluoroethylene composite material or molybdenum disulfide.
Preferably, the impeller is provided with a second soft sealing coating on the side facing the casing.
Preferably, the thickness of the second sealing soft coating ranges from 0.08mm to 0.12 mm.
Preferably, the second sealing soft coating is made of polytetrafluoroethylene composite material or molybdenum disulfide.
Preferably, the other side of the bearing is provided with a stator and a rotor.
In the present invention, the above-mentioned preferred conditions can be combined at will on the basis of general knowledge in the field, so as to obtain the preferred embodiments of the present invention.
The utility model discloses an actively advance the effect and lie in: the utility model provides a high-speed motor centrifugal air compressor makes the spiral flow that produces when gas passes through impeller back annular groove on the one hand can increase a tangential force on the rotor rotating surface, fluid friction has been increased, flow resistance and dissipation loss have been increased, thereby make the leakage quantity through the seal clearance reduce, the heat influence that the steam that has reduced the leakage led to the fact to the bearing, on the other hand is through setting up first seal coat and second seal coat between casing and impeller and between atmoseal and the rotation axis respectively, reach the effect that further reduces gas to bearing leakage, thereby shorten bearing length, improve the critical speed of rotor, make the compressor obtain abundant output pressure, and the structure is more compact.
Drawings
FIG. 1 is a cross-sectional view of a prior art high speed motor centrifugal air compressor.
Fig. 2 is a cross-sectional view of a high speed motor centrifugal air compressor in an embodiment of the present invention.
Fig. 3 is an enlarged view of a portion a in fig. 2.
Detailed Description
The present invention will be more clearly and completely described below with reference to the accompanying drawings.
As shown in fig. 2, the high-speed motor centrifugal air compressor in the present embodiment includes a housing 5, and a gas seal 6 is provided on the housing 5, and the rotary shaft 1 passes through a bearing 7 and the gas seal 6 in this order. An impeller 2, a scroll 3, and an expander 4 are provided on one side of the housing 5, and the back surface of the impeller 2 is opposed to the housing 5. On the other side of the bearing 7 there is a stator 8 and a rotor 9.
As shown in fig. 3, in the present embodiment, three annular grooves 21 are provided on the side of the impeller 2 facing the housing 5, the centers of the three annular grooves 21 all coincide with the rotation axis 1, and three toothed rings 51 are provided on the side of the housing 5 facing the impeller 2, the centers of the three toothed rings 51 also all coincide with the rotation axis 1. The free ends of the toothed ring 51 point to the impeller 2, but are arranged in a staggered manner with the annular groove 21 on the impeller 2, so that an originally straight gap between the casing 5' and the impeller 2 (see fig. 1) is blocked as a labyrinth passage, a tangential force can be added on the rotating surface of the rotor by spiral flow generated when gas passes through the annular groove 21 on the back of the impeller, fluid friction is increased, flow resistance and dissipation loss are increased, leakage through a sealing gap is reduced, the influence of the leaked hot gas on the bearing 7 is effectively eliminated, the bearing 7 can be closer to the impeller side than the structure (see fig. 1) in the prior art, and the length of the high-speed motor centrifugal air compressor is effectively shortened.
In this embodiment, the longitudinal section of the ring gear 51 parallel to the rotating shaft 1 is rectangular, the free end is further away from the center of the rotating shaft 1 than the fixed end connected to the housing 5, and the included angle between the central axis of the rectangle and the central axis of the rotating shaft ranges from 60 degrees to 90 degrees. Although the number of the annular grooves 21 and the number of the toothed rings 51 are three in the present embodiment, in other embodiments, the number may be increased or decreased according to the actual situation.
In the present embodiment, in addition to the above structure, in order to further reduce the influence of the gas leakage on the bearing 7, the first seal coating 23 is further provided on the side surface of the impeller 2 facing the housing 5, so as to further reduce the gap between the impeller 2 and the housing 5. In this embodiment, the first sealing coating 23 is made of a polytetrafluoroethylene composite material, and the thickness range thereof is 0.08mm to 0.12 mm. Similarly, in order to reduce the gap between the gas seal 6 and the rotary shaft 1 and to reduce the axial play and the gas leakage rate of the gas seal 6, a second soft seal coating 11 having a thickness in the range of 0.08mm to 0.12mm is provided on the outer peripheral surface of the rotary shaft 1 facing the gas seal 6, and the same material as the first seal coating 23 or a material different from the first seal coating 23 may be used. In other embodiments, the first sealing coating and the second sealing soft coating can be replaced by a soft material such as molybdenum disulfide, and the processing can be performed by a spraying process.
The technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Claims (9)
1. A high-speed motor centrifugal air compressor comprises a shell and a rotating shaft arranged in the shell in a penetrating mode, wherein an air seal and a bearing are arranged between the shell and the rotating shaft; the volute is characterized in that at least one annular groove is formed in one side, facing the shell, of the impeller; at least one toothed ring extending towards the impeller side is arranged on one side of the shell towards the impeller, and the free end of the toothed ring and the annular groove are arranged in a staggered mode.
2. A high-speed motor centrifugal air compressor as claimed in claim 1, wherein said ring gear has a rectangular longitudinal section, and an angle between a central axis of said rectangular section and a central axis of said rotary shaft is in a range of 60 to 90 degrees.
3. A high-speed motor centrifugal air compressor according to claim 1, wherein a first seal coating is provided on a portion of an outer peripheral surface of said rotary shaft which is opposed to said air seal.
4. A high speed motor centrifugal air compressor as claimed in claim 3 wherein said first seal coating has a thickness in the range of 0.08mm to 0.12 mm.
5. A high speed motor centrifugal air compressor as claimed in claim 4 wherein said first seal coating is made of a polytetrafluoroethylene composite or molybdenum disulfide.
6. A high speed motor centrifugal air compressor as claimed in claim 1 wherein said impeller is provided with a second soft seal coating on a side facing said housing.
7. A high speed motor centrifugal air compressor as claimed in claim 6 wherein said second sealing soft coating has a thickness in the range of 0.08mm to 0.12 mm.
8. A high speed motor centrifugal air compressor as claimed in claim 7 wherein said second soft sealing coating is a polytetrafluoroethylene composite or molybdenum disulfide.
9. A high speed motor centrifugal air compressor as claimed in claim 1 wherein the other side of said bearing is provided with a stator and a rotor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023095456.0U CN214118558U (en) | 2020-12-21 | 2020-12-21 | Centrifugal air compressor with high-speed motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023095456.0U CN214118558U (en) | 2020-12-21 | 2020-12-21 | Centrifugal air compressor with high-speed motor |
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| Publication Number | Publication Date |
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| CN214118558U true CN214118558U (en) | 2021-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202023095456.0U Active CN214118558U (en) | 2020-12-21 | 2020-12-21 | Centrifugal air compressor with high-speed motor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023273232A1 (en) * | 2021-07-02 | 2023-01-05 | 鑫磊压缩机股份有限公司 | Assembly accuracy self-correcting compressor |
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2020
- 2020-12-21 CN CN202023095456.0U patent/CN214118558U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023273232A1 (en) * | 2021-07-02 | 2023-01-05 | 鑫磊压缩机股份有限公司 | Assembly accuracy self-correcting compressor |
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