[0025] The present invention will be further described below, but is not limited to the contents of the description.
[0026] When the fluid is passed through the surface, since the friction speed will gradually reduce the formation of the boundary layer, the boundary layer separation forms a vortex, which can cause the boundary layer inverse flow, reduce the main flow co-flow area, and it is not possible to act. At the same time, since the speed difference between the flow of the flow of flow in the volute, the inner wall surface of the fluid volute is generated in the vertical fluid direction, disrupting the flow field of the mainstream region.
[0027] like figure 1 As shown, according to the first embodiment of the present invention, a volute is disclosed, and the volute is used for the centrifugal compressor, and the inner wall 11 of the volute is provided with a guide groove 12, which is used for constraints. The flow field direction of the boundary layer generated by fluid flow. The volute of the present invention is provided by the direction of the flow field, and the boundary layer formed by the fluid is constrained by the inner wall 11 of the volute, and the boundary is not easily expanded, preventing the boundary layer from separation, avoiding formation. Blocking group; further, by constraining the direction of the flow field, the resistance in the vertical fluid direction can be increased, thereby preventing the formation of the secondary stream, reducing flow loss.
[0028] The volute is mainly used for flow gases, such as air, water vapor or refrigeration, and this embodiment is specifically described by air, and the inner wall 11 of the volute includes a blending surface 111, and the guide groove 12 is disposed on the expanded surface. 111. A diffuser is also provided in the volute, and the diffuser is provided with the bonding surface 111, and the expanded passage is formed between the expansion surface and the blending surface such that the outlet air flow of the impeller 20 is expanded, and the pressure is improved. Since the fluid groove 12 is disposed within the expanded channel (since the airflow is out of the impeller outlet, it is easy to form a reverse expanded gradient. In order to solve this problem, in the present embodiment, the flow guide 12 Inside the expanded channel, by placing the guide groove 12 in the expanded channel, it is sufficient to restrain the flow field, reduce the formation and thickening of the boundary layer, during airflow expansion, the guide groove 12 can The direction of the flow field of the constrained boundary layer avoids generating blocking group to improve the expansion effect.
[0029] The volute includes a suction port 13 and an exhaust port 14, and the flow tank 12 is located at a position close to the suction port 13. By setting the flow tank to the intake port 13 position, the airflow into the volute can be accelerated, and the flow route of the airflow in the expanded passage can reduce the friction loss.
[0030] The guide groove 12 is disposed on the outer peripheral side of the intake port 13. By providing the guide groove 12 on the outer peripheral side of the intake port 13, the airflow can directly enter the guide groove 12, so that the air flow entering the volute is accelerated, and the flow route of the airflow in the expanded passage can reduce the friction loss. Further, the flow can be set to be set, which can better avoid the formation of the secondary stream, which reduces the flow route in the expanded passage to reduce the friction loss.
[0031] Further, the amount of the guide groove 12 is the same as the amount of the blade 22 of the impeller 20 of the centrifugal compressor. Thereby with the impeller phase, the amount of air flow in the impeller is matched to the number of pilot grooves, thereby better constraining the flow field of the boundary layer, more effectively preventing the formation of the secondary stream.
[0032] In other embodiments not shown, the number of the guide grooves 12 is a plurality of, and the positions of the plurality of guide grooves 12 can be distributed over the entire inner wall 11 of the volute, and the number of the guide grooves 12 is different from the number of blades. It is also possible to achieve the effect of preventing boundary layer separation and secondary flow formation.
[0033] One end of the guide groove 12 towards the intake port 13 of the volute, that is, one end of the guide groove 13 is directed to the suction port 13, so that the airflow directly enters the flow guide 12, reducing the formation of the spoiler. When the guide groove 12 is plural, the plurality of flow grooves form a diffusion distribution overall, and the specific shape is referred to. figure 1 Such a distributed method can avoid the impact of the impeller outlet air to reduce the formation of noise.
[0034] The shape of the guide groove 12 is the curved groove, which is the same as the airflow direction of the impeller outlet, thereby preventing the secondary stream in the direction of the constrained flow field while reducing the generation of the spoiler, further reduces the loss of air flow.
[0035] In the direction of fluid flow (in this embodiment, air flow flow), the groove depth of the guide groove 12 gradually decreases, and since the exit groove decreases, the outlet width of the expansion channel is lowered, and the fluid increases at the exit. When the compressor operates at a small load, it is possible to prevent the formation of the backfosal gradient, prevent the boundary layer from forming fluid separation, which can adapt the compressor to a wider range of operation.
[0036] According to a second embodiment of the present invention, a compressor comprising the above-described volute.
[0037] like figure 2 and image 3 As shown, the compressor also includes an impeller 20, and the impeller 20 is mounted in the volute, and the impeller 20 includes a hub 21 and a plurality of blades 22 provided on the hub 21, and the two blades 22 form a airflow flow channel, and the airflow flow channel is disposed. There is a boundary layer reduction unit 23.
[0038] The boundary layer reduction unit 23 includes a guide groove disposed on the hub 21, and the guide groove is disposed in the direction of the flow of the gas. The guide groove at the outlet of the hub 21 of the impeller can reduce the thickness of the boundary layer at this position, optimize the flow field of the next component volute, and the flow channel 12 in the mating the volute is bonded to the expansion channel. The fluid boundary layer has a decrease in thickness, inhibits fluid separation at this position.
[0039] like Figure 4 As shown, the cylinder 30 is irregularly part, which is generally cast, and supports, protects. The internal inlaid water cooled sleeve is inserted and the water cooled sleeve constitutes a spiral cooling flow path.
[0040] The front axial bearing 51 and the rear axial bearing, the front radial bearing 52 and the rear radial bearing are air type gas bearing, the working medium is air, and the gas film suspension thrust disk 60 is formed, and the motor shaft 70 is formed.
[0041] The front bearing housing and the rear bearing housing are hollow, and the rotary part is supported for gas bearing.
[0042] The motor stator is a rotary type part, mainly consisting of a stator core, a stator winding. The motor shaft 70 is the axis, solid parts. The lock nut, impeller 20, thrust disk 60, and motor shaft 70 constitute a rotor, and the motor stator generates a magnetic field, and the rotor performs high-speed rotational motion under electromagnetic field.
[0043] Obviously, the above-described embodiments of the present invention are merely illustrative of the invention, but is not limited to the embodiments of the present invention.For those skilled in the art, different variations or variations can also be made based on the above description.All implementations cannot be exhausted here.An obvious change or variation that is extended by the technical solution belonging to the present invention is still in the scope of the invention.
