CN115726996A - Shafting structure, compressor and heat pump system - Google Patents
Shafting structure, compressor and heat pump system Download PDFInfo
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- CN115726996A CN115726996A CN202211230381.3A CN202211230381A CN115726996A CN 115726996 A CN115726996 A CN 115726996A CN 202211230381 A CN202211230381 A CN 202211230381A CN 115726996 A CN115726996 A CN 115726996A
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- 239000011888 foil Substances 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 5
- 230000029058 respiratory gaseous exchange Effects 0.000 claims description 4
- 230000004323 axial length Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 claims 1
- 239000010935 stainless steel Substances 0.000 description 6
- 229910001069 Ti alloy Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- 244000126211 Hericium coralloides Species 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 229910001256 stainless steel alloy Inorganic materials 0.000 description 3
- 229910000619 316 stainless steel Inorganic materials 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000010963 304 stainless steel Substances 0.000 description 1
- 239000010964 304L stainless steel Substances 0.000 description 1
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention provides a shaft system structure, a compressor and a heat pump system. The shafting structure comprises an impeller, and a bearing matching part is arranged at the air suction end of the impeller; and the supporting bearing is sleeved on the bearing matching part. According to the shafting structure, the compressor and the heat pump system, the impeller is supported by the supporting bearing in an auxiliary mode, the influence of the weight of the impeller on the cantilever is reduced, the critical rotating speed and the stability of the shafting are effectively improved, and the temperature rise of the heat pump system where the shafting structure is located meets the requirement of replacing a coal-fired boiler.
Description
Technical Field
The invention relates to the technical field of air treatment equipment, in particular to a shafting structure, a compressor and a heat pump system.
Background
The heat pump technology is utilized to extract heat in the air source, high-temperature and high-pressure steam is finally output, the pollution problem of the fuel boiler can be effectively solved, meanwhile, the air source heat pump can extract heat from the air source, and the air source heat pump has wide adaptability and an energy-saving effect. A mature air source heat pump system for replacing a coal-fired boiler does not exist in China, and the bottleneck of the system is in a water vapor shafting structure. The temperature rise required by an air source heat pump system for replacing a coal-fired boiler is generally 20-40 ℃, the shaft system structure pressure ratio of a single-cantilever single impeller is smaller, the temperature rise is generally 8-10 ℃, the substitution requirement cannot be met, although the shaft system structure of the single-cantilever double impeller can meet the requirement of temperature rise, the impeller appearance of water vapor is larger due to the physical property of the water vapor, and for corrosion resistance, the impeller of the water vapor shaft system structure is generally made of stainless steel or titanium alloy, the density of the stainless steel or titanium alloy is larger than that of the aluminum alloy, so that the weight of the cantilever of the impeller is increased, the critical rotating speed of the shaft system structure is low, and the temperature rise effect of the compressor is low.
Disclosure of Invention
In order to solve the technical problem of low temperature rise effect caused by low critical rotating speed of a single-cantilever double-impeller shafting structure in the prior art, the shafting structure, the compressor and the heat pump system which utilize the supporting bearing to carry out auxiliary supporting to improve stability and critical rotating speed are provided.
A shafting structure, comprising:
the air suction end of the impeller is provided with a bearing matching part;
and the supporting bearing is sleeved on the bearing matching part.
The shafting structure further comprises a diffuser, the impeller is arranged in the diffuser, and the support bearing is arranged between the diffuser and the bearing matching part.
The longitudinal section of the support bearing is L-shaped and comprises a mounting section and a matching section which are connected with each other, the matching section is positioned between the diffuser and the bearing matching part, and the mounting section is positioned on one side of the diffuser.
The shafting structure comprises a rotating shaft, the impeller is arranged on the rotating shaft, the cross section of the bearing matching part is annular, and the axis of the bearing matching part is collinear with the axis of the rotating shaft.
The impeller includes a shroud that constitutes the bearing engagement portion.
The shafting structure further comprises a rotating shaft and a first radial bearing, the impeller and the first radial bearing are arranged on the rotating shaft, and the first radial bearing is located on one side, far away from the supporting bearing, of the impeller.
The shafting structure further comprises a motor, the rotating shaft is connected to the motor, and the first radial bearing is located between the impeller and the motor.
The impeller includes one-level impeller and second-stage impeller, the one-level impeller with the second-stage impeller all set up in the pivot, just the one-level impeller is located the second-stage impeller is kept away from one side of motor, the end department of breathing in of one-level impeller is provided with bearing cooperation portion.
The fit clearance between the support bearing and the bearing fit part is larger than that between the first radial bearing and the rotating shaft.
The motor includes rotor and second radial bearing, the rotor with the second radial bearing all overlaps and locates in the pivot, just the second radial bearing is located the rotor is kept away from one side of impeller, support bearing with the fit clearance of bearing cooperation portion is greater than the second radial bearing with the fit clearance of pivot.
The ratio range of the axial length L of the supporting bearing to the inner diameter D of the supporting bearing is more than or equal to 0.2 and less than or equal to L/D and less than or equal to 0.3.
The support bearing comprises a foil gas dynamic bearing.
A compressor comprises the shafting structure.
A heat pump system comprises the shafting structure or the compressor.
According to the shafting structure, the compressor and the heat pump system, the support bearing is used for supporting the impeller in an auxiliary mode, so that the influence of the weight of the impeller on the cantilever is reduced, the critical rotating speed and the stability of the shafting are effectively improved, and the temperature rise of the heat pump system in which the shafting structure is located meets the requirement of replacing a coal-fired boiler.
Drawings
Fig. 1 is a schematic structural diagram of a shafting structure according to an embodiment of the present invention;
fig. 2 is another schematic structural diagram of a shafting structure according to an embodiment of the present invention;
in the figure:
1. an impeller; 11. a bearing fitting portion; 2. a support bearing; 3. a diffuser; 21. an installation section; 22. a mating segment; 5. a rotating shaft; 6. a first radial bearing; 12. a first-stage impeller; 13. a secondary impeller; 71. a rotor; 72. a second radial bearing.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
The shafting structure is an assembly including a rotating shaft and a related structure connected to the rotating shaft, and taking a steam compressor as an example, the rotating shaft, a motor connected to the rotating shaft, an impeller and a related bearing are all included in the shafting structure.
In a shafting structure of a steam compressor, an impeller of the steam compressor generally adopts stainless steel or titanium alloy in order to meet the compression requirement of steam, however, the density of the stainless steel is about 2.9 times of that of the aluminum alloy, the density of the titanium alloy is about 1.7 times of that of the aluminum alloy, and the physical property requirement of the steam for the impeller of the steam is much larger than that of the impeller corresponding to refrigerants such as R134a and the like, so that the weight of the impeller is further increased, finally, the cantilever weight of the impeller is increased, the critical rotating speed of the shafting structure is greatly reduced, and the compression efficiency of the compressor is caused.
To this end, the present invention discloses a shafting structure as shown in fig. 1 and 2, comprising: the impeller comprises an impeller 1, wherein a bearing matching part 11 is arranged at the air suction end of the impeller 1; and the supporting bearing 2 is sleeved on the bearing matching part 11. The impeller 1 is supported in an auxiliary manner by the supporting bearing 2, so that the influence of the weight of the impeller on a cantilever is reduced, the critical rotating speed and the stability of a shafting are effectively improved, and the temperature rise of a heat pump system with the shafting structure meets the requirement of replacing a coal-fired boiler.
The support bearing 2 comprises a foil gas dynamic pressure bearing, the foil gas dynamic pressure bearing not only meets the requirements of bearing and rigidity, but also does not need gas supply or lubricating oil during operation, and the shafting structure is not more complicated. Meanwhile, in order to generate a gas film, the gap of the foil gas dynamic pressure bearing cannot be large necessarily, namely the fit gap between the foil gas dynamic pressure bearing and the impeller 1 is smaller than that of a comb tooth sealing structure in the prior art, so that the sealing effect of the supporting bearing 2 is superior to that of the comb tooth sealing, the exhaust of the impeller 1 is reduced, the leakage of the air suction is reduced, the side comb tooth sealing of the impeller 1 is not required to be additionally increased, the structure is simple, and the energy efficiency of a shafting structure can be further improved.
As an embodiment, the shafting structure further includes a diffuser 3, the impeller 1 is disposed in the diffuser 3, and the support bearing 2 is disposed between the diffuser 3 and the bearing matching portion 11.
Specifically, support bearing 2's longitudinal section is L shape, and includes interconnect's erection segment 21 and cooperation section 22, cooperation section 22 is located diffuser 3 with between the bearing cooperation portion 11, erection segment 21 is located one side of diffuser 3, just erection segment 21 set up in on the diffuser 3. When the support bearing 2 is installed, the support bearing 2 can be slid in from one end of the diffuser 3, and the installation section 21 is attached and fixed to the diffuser 3, so that installation is completed. The longitudinal section is a section parallel to the plane of the axis of the support bearing 2.
The material of the support bearing 2 is stainless steel, specifically 304 stainless steel, 316 stainless steel, 304L stainless steel or 316L stainless steel.
The shafting structure includes pivot 5, impeller 1 set up in on the pivot 5, the cross section of bearing cooperation portion 11 is the annular, just the axis of bearing cooperation portion 11 with the axis collineation of pivot 5. That is, the bearing fitting portion 11 is an annular structure surrounding the suction end of the impeller 1, which can ensure a reliable fit with the support bearing 2. Wherein the cross section means a section parallel to the end face of the support bearing 2.
Optionally, the impeller 1 includes a shroud, and the shroud constitutes the bearing fitting portion 11. Support bearing 2 cooperates with the wheel cap and can realize the support to impeller 1, and support bearing 2 has replaced the broach seal structure among the prior art simultaneously, because support bearing 2's clearance is less than broach seal structure's clearance, consequently support bearing 2 can also reduce impeller 1 with the cooperation of wheel cap and exhaust to breathing in and reveal, need not additionally to increase impeller 1 side broach again and seal, guarantees that the structure is succinct, can further promote the efficiency of shafting structure.
The shafting structure still includes pivot 5 and first radial bearing 6, impeller 1 with first radial bearing 6 all set up in on the pivot 5, just first radial bearing 6 is located impeller 1 keeps away from one side of support bearing 2. The first radial bearing 6 is used for a rotating shaft 5 part connected with an exhaust section of the impeller 1, the impeller 1 is supported under the matching of the supporting bearing 2 and the first radial bearing 6, and when the impeller 1 is heavy, the critical rotating speed of a shafting structure can be ensured. Meanwhile, the supporting shaft 5 can be quickly supported when the impeller is started, so that dry friction between the supporting bearing 2 and the impeller 1 is avoided, and the service life of the supporting bearing 2 is ensured.
The shafting structure further comprises a motor, the rotating shaft 5 is connected to the motor, and the first radial bearing 6 is located between the impeller 1 and the motor.
In order to further improve the pressure ratio of shafting structure and improve the temperature rise, impeller 1 includes one-level impeller 12 and second-stage impeller 13, one-level impeller 12 with second-stage impeller 13 all set up in on the pivot 5, just one-level impeller 12 is located second-stage impeller 13 keeps away from one side of motor, the end of breathing in of one-level impeller 12 is provided with bearing cooperation portion 11. The first radial bearing 6 is disposed on one side of the secondary impeller 13 away from the primary impeller 12, so as to ensure reliable support of the primary impeller 12 and the secondary impeller 13.
Because the impeller 1 is positioned at the cantilever end of the rotating shaft 5, certain eccentric motion is inevitably generated, and the support bearing 2 is used as an auxiliary bearing to avoid interference between the impeller 1 and the support bearing 2, the fit clearance between the support bearing 2 and the bearing fitting part 11 is larger than that between the first radial bearing 6 and the rotating shaft 5, so that the reliability of the shafting structure is ensured.
Similarly, the motor includes a rotor 71 and a second radial bearing 72, the rotor 71 and the second radial bearing 72 are all sleeved on the rotating shaft 5, the second radial bearing 72 is located at a position where the rotor 71 is far away from one side of the impeller 1, and the fit clearance of the support bearing 2 and the bearing fit part 11 is greater than the fit clearance of the second radial bearing 72 and the rotating shaft 5. Since the rotational accuracy of the rotor 71 is required to be high, the fitting clearance of the second radial bearing 72 is small, and the fitting clearance of the support bearing 2 and the bearing fitting portion 11 is set to be large in order to avoid interference between the impeller 1 and the support bearing 2.
Preferably, the fit clearance between the support bearing 2 and the bearing fit part 11 ranges from 0.1mm to 0.15mm; the fitting clearance of the first radial bearing 6 has a value range of 0.03mm to 0.08mm; the fitting clearance of the second radial bearing 72 has a value in the range of 0.03mm to 0.08mm.
The ratio range of the axial length L of the support bearing 2 to the inner diameter D of the support bearing 2 is more than or equal to 0.2 and less than or equal to L/D and less than or equal to 0.3. The influence on the size and the structural stability of the shafting structure caused by the overlong length of the support bearing 2 is avoided. And simultaneously, the problem that the impeller 1 cannot be reliably supported due to the fact that the length of the supporting bearing 2 is too small is avoided.
A compressor comprises the shafting structure.
A heat pump system comprises the shafting structure or the compressor.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (14)
1. A shafting structure, characterized in that: the method comprises the following steps:
the air suction end of the impeller (1) is provided with a bearing matching part (11);
and the supporting bearing (2), wherein the supporting bearing (2) is sleeved on the bearing matching part (11).
2. The shafting structure according to claim 1, wherein: the shafting structure further comprises a diffuser (3), the impeller (1) is arranged in the diffuser (3), and the support bearing (2) is arranged between the diffuser (3) and the bearing matching part (11).
3. A shafting arrangement according to claim 2, wherein: the longitudinal section of support bearing (2) is L shape, and includes interconnect's installation section (21) and cooperation section (22), cooperation section (22) are located diffuser (3) with between bearing cooperation portion (11), installation section (21) are located one side of diffuser (3)。
4. The shafting structure according to claim 1, wherein: the shafting structure includes pivot (5), impeller (1) set up in on pivot (5), the cross section of bearing cooperation portion (11) is the annular, just the axis of bearing cooperation portion (11) with the axis collineation of pivot (5).
5. The shafting structure according to claim 1, wherein: the impeller (1) includes a shroud that constitutes the bearing engagement portion (11).
6. The shafting structure according to claim 1, wherein: the shafting structure further comprises a rotating shaft (5) and a first radial bearing (6), the impeller (1) and the first radial bearing (6) are arranged on the rotating shaft (5), and the first radial bearing (6) is located at one side, far away from the impeller (1), of the supporting bearing (2).
7. The shafting structure as in claim 6, wherein: the shafting structure further comprises a motor, the rotating shaft (5) is connected to the motor, and the first radial bearing (6) is located between the impeller (1) and the motor.
8. The shafting structure as in claim 7, wherein: impeller (1) includes one-level impeller (12) and second-stage impeller (13), one-level impeller (12) with second-stage impeller (13) all set up in on pivot (5), just one-level impeller (12) are located second-stage impeller (13) is kept away from one side of motor, the end department of breathing in of one-level impeller (12) is provided with bearing cooperation portion (11).
9. The shafting structure according to claim 6, wherein: the fit clearance between the support bearing (2) and the bearing fit part (11) is larger than that between the first radial bearing (6) and the rotating shaft (5).
10. The shafting structure according to claim 7, wherein: the motor comprises a rotor (71) and a second radial bearing (72), the rotor (71) and the second radial bearing (72) are all sleeved on the rotating shaft (5), the second radial bearing (72) is located at one side, away from the rotor (71), of the impeller (1), and the matching clearance of the supporting bearing (2) and the bearing matching part (11) is larger than that of the second radial bearing (72) and the rotating shaft (5).
11. The shafting structure according to claim 1, wherein: the ratio range of the axial length L of the support bearing (2) to the inner diameter D of the support bearing (2) is more than or equal to 0.2 and less than or equal to L/D and less than or equal to 0.3.
12. The shafting structure according to claim 1, wherein: the support bearing (2) comprises a foil gas dynamic pressure bearing.
13. A compressor, characterized by: comprising a shafting structure according to any one of claims 1 to 12.
14. A heat pump system, characterized by: comprising a shafting structure according to any one of claims 1 to 12 or a compressor according to claim 13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211230381.3A CN115726996A (en) | 2022-09-30 | 2022-09-30 | Shafting structure, compressor and heat pump system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211230381.3A CN115726996A (en) | 2022-09-30 | 2022-09-30 | Shafting structure, compressor and heat pump system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115726996A true CN115726996A (en) | 2023-03-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211230381.3A Pending CN115726996A (en) | 2022-09-30 | 2022-09-30 | Shafting structure, compressor and heat pump system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115726996A (en) |
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- 2022-09-30 CN CN202211230381.3A patent/CN115726996A/en active Pending
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