Air compressor with notch groove bearing
By constructing grooved bearings on the rotor and thrust disc of the air compressor, the problems of inconsistent tolerances of traditional foil bearing parts and coating peeling are solved, and more efficient pneumatic performance and air cleanliness are achieved.
Patent Information
- Application Number
- CN202420899076.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-26
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-04-26
AI Technical Summary
It is difficult for existing air compressors to achieve high efficiency, oil-free, small size and high temperature resistance in fuel cell gas supply subsystems. At the same time, the inconsistent component tolerances of traditional foil bearings and the coating peeling affect gas cleanliness.
Using a groove bearing structure, by constructing radial and thrust grooves on the rotor and thrust disc, air-film air-floating bearings are formed, reducing the number of parts, improving accuracy and consistency, and avoiding coating falling off.
The bearing structure is simplified, pneumatic efficiency and air cleanliness are improved, processing costs are reduced, and the performance of the whole machine is improved.
Smart Images
Figure CN222162962U_ABST
Abstract
Description
Technical Field
[0001] The utility model generally relates to the technical field of air compressors. Specifically, the utility model relates to an air compressor with a grooved bearing. Background Art
[0002] In the gas supply subsystem of the fuel cell, the air compressor is an important component, and this application scenario also puts forward many special requirements for it. For example, due to the particularity of the proton exchange membrane fuel cell reaction, the high-pressure air provided to it must be clean, which means that the air compressor in the gas supply subsystem should have the characteristic of oil-free. On the other hand, the air compressor consumes a lot of energy during operation, so it also needs to have high working efficiency. In order to obtain good overall performance, the air compressor must seek an efficient compression method that can achieve a higher operating speed and higher working efficiency, and also has the characteristics of oil-free, small size, long service life, and high temperature resistance.
[0003] In view of the above problems, oil-free air-floating foil bearings are usually used as the support structure of the high-speed motor rotor system in the prior art. Air-floating foil bearings are a kind of adaptive flexible support hydrodynamic bearings, which have many advantages and can solve many limitations of traditional oil bearings in application and realize the "oil-free" of mechanical equipment. Among them, air foil bearings are air-floating bearings with good flexible surface composed of one or more layers of corrugated foil and top foil.
[0004] Figure 1 FIG. 2 shows a schematic diagram of a single-stage air compressor supported by an air-floating foil bearing rotor system in the prior art. Figure 1 As shown, the air compressor includes a motor housing 101 , a rotor 102 , a thrust plate 103 , a radial foil bearing 104 , a thrust foil bearing 105 , an air inlet 106 and an air outlet 107 . Figure 2 FIG. 2 shows a schematic diagram of the structure of a radial foil bearing in the prior art. Figure 2 As shown, in the air compressor, the radial foil bearing 104 for supporting the rotor 102 includes a bearing sleeve 201, a radial bearing top foil 202 and a radial bearing wave foil 203, wherein the radial bearing wave foil 203 is fixedly arranged between the bearing sleeve 201 and the radial bearing top foil 202 at the wave foil welding point 204 by welding. Figure 3 FIG. 2 shows a schematic diagram of the structure of a thrust foil bearing in the prior art. Figure 3 As shown, in the air compressor, the thrust foil bearing 105 for bearing the axial force generated by pneumatics includes a thrust bearing top foil 301 , a thrust bearing wave foil 302 , a cushion block 303 and a bottom plate 304 .
[0005] like Figure 2 and Figure 3 As shown, the air-floating foil bearing is composed of multiple parts. Due to the matching relationship and tolerance of each part, the consistency of the air-floating foil bearing is difficult to guarantee. In addition, some parts need to be fixed by welding or pinning to ensure the bearing to play the air-floating performance. Generally speaking, the dimensional accuracy of the foil raw material is ±0.01mm, so the finished product usually has a tolerance of 0.015 to 0.04mm. The running speed of the high-speed motor rotor supported by the foil bearing usually ranges from 50k rpm to 200k rpm, which requires higher stability, and thus requires a higher matching dimensional accuracy between the rotor and the radial bearing and thrust bearing. Usually, the matching clearance between the foil bearing and the rotor ranges from 0.02 to 0.08mm. Therefore, if the dimensional tolerance of the foil bearing is too large, it will seriously affect the stability of the rotor system. And the bearing dimensional tolerance and the bearing rotor matching clearance are too large to affect the wheel shell clearance, and then affect the aerodynamic efficiency of the air compressor. Usually, the wheel shell clearance of the air compressor using foil bearings is above 0.4mm. In addition, conventionally, the top foil of the foil bearing is usually provided with a coating for lubrication and wear resistance. During the operation of the air compressor, the coating will fall off in the form of particles or powder, thereby affecting the cleanliness of the gas. Utility Model Content
[0006] In order to at least partially solve the above problems in the prior art, the utility model provides an air compressor with a grooved bearing, comprising:
[0007] a motor housing including an air inlet and an air outlet; and
[0008] The rotor is arranged inside the motor housing, and radial grooves are arranged on the surface of the rotor. When the rotor rotates, gas is introduced into the radial grooves to generate an air film to form a grooved air-floating radial bearing.
[0009] In one embodiment of the present invention, it is provided that the radial groove comprises a first radial groove and a second radial groove, wherein the first radial groove and the second radial groove are arranged at a bearing support position of the rotor.
[0010] In one embodiment of the utility model, it is provided that the air compressor with a grooved bearing further comprises:
[0011] A thrust plate is arranged at the end of the rotor, and a thrust groove is arranged on the surface of the thrust plate. When the rotor rotates, gas is introduced into the thrust groove to generate an air film to form a grooved air-floating thrust bearing.
[0012] In one embodiment of the present invention, it is provided that the thrust plate and the rotor are integrally formed.
[0013] In one embodiment of the present utility model, it is provided that the thrust groove comprises:
[0014] A first thrust groove is disposed on a first surface of the thrust plate; and
[0015] The second thrust groove is arranged on a second surface of the thrust plate opposite to the first surface.
[0016] In one embodiment of the present invention, it is provided that the groove shape of the radial groove is a "human" shape.
[0017] In one embodiment of the present invention, it is provided that the groove shape of the thrust groove is spiral.
[0018] In one embodiment of the present invention, it is provided that the groove depth of the radial groove and / or the thrust groove is 5 to 30 microns.
[0019] In one embodiment of the present invention, it is provided that the radial groove and / or the thrust groove are / is / are constructed in a manner including electrochemical etching or laser engraving.
[0020] In one embodiment of the present invention, it is provided that the radial groove includes a radial groove dam area and a radial groove groove area; and
[0021] The thrust groove includes a thrust groove dam area and a thrust groove groove area.
[0022] The utility model has at least the following beneficial effects:
[0023] (1) Grooves are formed on the rotor and the thrust plate to form a grooved air bearing, which reduces the number of parts compared to a conventional foil air bearing and makes the installation of the air compressor rotor more convenient.
[0024] (2) Grooving can be done by laser or etching, which has high processing accuracy, can improve the consistency of product quality, and has low processing cost.
[0025] (3) The thrust plate and the rotor are processed as one piece, which improves the position accuracy between the thrust plate and the rotor.
[0026] (4) By constructing grooves on the rotor and the thrust plate to form a grooved air bearing, the wheel housing clearance of the air compressor can be reduced and the aerodynamic efficiency of the entire machine can be improved.
[0027] (5) By constructing grooves on the rotor and the thrust plate to form a grooved air bearing, there is no need to set a coating on the top foil of a traditional foil bearing, thereby avoiding the risk of coating particles being worn and falling into the system, and improving the cleanliness of the outlet air. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] To further illustrate the advantages and features of the various embodiments of the present invention, a more detailed description of the various embodiments of the present invention will be presented with reference to the accompanying drawings. It will be understood that these drawings only depict typical embodiments of the present invention and are therefore not to be considered as limiting the scope thereof. In the accompanying drawings, for clarity, identical or corresponding components will be represented by identical or similar reference numerals.
[0029] Figure 1 A schematic diagram of the structure of a single-stage air compressor supported by an air-floating foil bearing rotor system in the prior art is shown.
[0030] Figure 2 A schematic structural diagram of a radial foil bearing in the prior art is shown.
[0031] Figure 3 A schematic structural diagram of a thrust foil bearing in the prior art is shown.
[0032] Figure 4 The schematic diagram of the structure of an air compressor with a grooved bearing in one embodiment of the utility model is shown.
[0033] Figure 5 The figure shows a schematic structural diagram of a rotor in an embodiment of the utility model.
[0034] Reference numerals:
[0035] Motor housing 101, rotor 102, thrust plate 103, radial foil bearing 104, thrust foil bearing 105, air inlet 106, air outlet 107, bearing sleeve 201, radial bearing top foil 202, radial bearing wave foil 203, thrust bearing top foil 301, thrust bearing wave foil 302, pad 303, bottom plate 304, motor housing 401, rotor 402, air inlet 403, air outlet 404, thrust plate 405, radial groove 406, thrust groove 407, DETAILED DESCRIPTION
[0036] It should be noted that the components in the figures may be shown exaggeratedly for the sake of illustration and are not necessarily true to scale. In the figures, identical or functionally identical components are provided with the same reference numerals.
[0037] In the present invention, unless otherwise specified, "arranged on...", "arranged above..." and "arranged above..." do not exclude the existence of an intermediate object between the two. In addition, "arranged on or above..." only indicates the relative positional relationship between two components, and in certain circumstances, such as after reversing the product direction, it can also be converted into "arranged under or below...", and vice versa.
[0038] In the present invention, each embodiment is only intended to illustrate the solution of the present invention and should not be understood as limiting.
[0039] In the present invention, unless otherwise specified, the quantifiers "a", "an" and "an" do not exclude the presence of multiple elements.
[0040] It should also be noted that in the embodiments of the present invention, for the sake of clarity and simplicity, only a portion of the components or assemblies may be shown, but those of ordinary skill in the art will understand that under the teachings of the present invention, the required components or assemblies may be added according to the needs of the specific scenario. In addition, unless otherwise specified, the features in different embodiments of the present invention may be combined with each other. For example, a feature in the second embodiment may be used to replace a feature in the first embodiment that corresponds to or has the same or similar functions, and the resulting embodiment also falls within the disclosure scope or recorded scope of the present application.
[0041] It should also be pointed out that within the scope of the present invention, the terms "same", "equal", "equal to" and the like do not mean that the values of the two are absolutely equal, but allow a certain reasonable error, that is, the terms also cover "substantially the same", "substantially equal", "substantially equal to". By analogy, in the present invention, the terms "perpendicular to", "parallel to", etc. indicating directions also cover the meanings of "substantially perpendicular to" and "substantially parallel to".
[0042] In addition, the numbering of the steps of the methods of the present invention does not limit the execution order of the method steps. Unless otherwise specified, the method steps can be executed in different orders.
[0043] The utility model directly arranges the grooved air bearing on the rotor bearing support position and the two side planes of the thrust plate, which replaces the traditional foil air bearing, simplifies the bearing structure, improves the consistency of bearing quality, can adapt to smaller gaps, and improves the pneumatic efficiency of the air compressor.
[0044] The present invention will be further described below in conjunction with specific embodiments with reference to the accompanying drawings.
[0045] Figure 4 FIG. 2 shows a schematic diagram of the structure of an air compressor with a grooved bearing in one embodiment of the utility model. Figure 4As shown, the air compressor with grooved bearings includes a motor housing 401, a rotor 402, an air inlet 403 and an air outlet 404, wherein the first end of the rotor 402 is configured with a thrust plate 405, a radial groove 406 is provided at the bearing support position of the rotor 402, and thrust grooves 407 are provided on the first surface and the second surface opposite thereto of the thrust plate 405. When the rotor 402 rotates, gas is introduced into the radial groove 406 to generate an air film to form a grooved air-floating radial bearing, and gas is introduced into the thrust groove 407 to generate an air film to form a grooved air-floating thrust bearing. Compared with traditional foil bearings, the utility model reduces the number of components that need to be set.
[0046] Figure 5 FIG. 2 shows a schematic diagram of the structure of a rotor in one embodiment of the utility model. Figure 5 As shown, since the thrust plate 405 and the rotor 402 are processed in an integrated manner, the relative position accuracy of the thrust plate and the rotor can be guaranteed. Two radial grooves 406 are arranged at the bearing support position of the rotor 402, and the thrust grooves 407 are arranged on the two side planes of the thrust plate 405. The radial grooves 406 and the thrust grooves 407 are constructed with uniformly distributed grooves of different shapes. Specifically, the grooves of the radial grooves 406 are in a "human" shape, and the grooves of the thrust grooves are in a spiral shape. According to the size differences of different bearing rotor systems, the groove depths of the radial grooves 406 and the thrust grooves 407 can be 5 to 30 microns, and the construction method can be electrochemical corrosion or laser engraving. The radial groove 406 includes a radial groove dam area 501 and a radial groove area 502, and the thrust groove 407 includes a thrust groove dam area 503 and a thrust groove area 504. According to the narrow groove theory (NGT), when gas encounters a step during the extrusion process, a higher gas pressure will be formed in the "dam area" of the step, thereby supporting the rotor 402.
[0047] Although various embodiments of the utility model are described above, it should be understood that they are presented as examples only and not as limitations. It is obvious to those skilled in the relevant art that various combinations, modifications and changes can be made thereto without departing from the spirit and scope of the utility model. Therefore, the breadth and scope of the utility model disclosed herein should not be limited by the exemplary embodiments disclosed above, but should only be defined according to the attached claims and their equivalents.
Claims
1. An air compressor with a grooved bearing, characterized in that: include: A motor housing including an air inlet and an air outlet; as well as The rotor is arranged inside the motor housing, and radial grooves are arranged on the surface of the rotor. When the rotor rotates, gas is introduced into the radial grooves to generate an air film so as to form a grooved air-floating radial bearing.
2. The air compressor with grooved bearing according to claim 1, characterized in that: The radial grooves include a first radial groove and a second radial groove, wherein the first radial groove and the second radial groove are arranged at a bearing support position of the rotor.
3. The air compressor with grooved bearing according to claim 1, characterized in that: Also includes: A thrust plate is arranged at the end of the rotor, and a thrust groove is arranged on the surface of the thrust plate. When the rotor rotates, gas is introduced into the thrust groove to generate an air film to form a grooved air-floating thrust bearing.
4. The air compressor with grooved bearing according to claim 3, characterized in that: The thrust plate and the rotor are integrally formed.
5. The air compressor with grooved bearing according to claim 3, characterized in that: The thrust groove comprises: A first thrust groove is disposed on a first surface of the thrust plate; and The second thrust groove is arranged on a second surface of the thrust plate opposite to the first surface.
6. The air compressor with grooved bearing according to claim 1, characterized in that: The groove shape of the radial groove is a "human" shape.
7. The air compressor with grooved bearing according to claim 3, characterized in that: The groove shape of the thrust groove is spiral.
8. The air compressor with grooved bearing according to claim 3, characterized in that: The groove depth of the radial groove and / or the thrust groove is 5 to 30 microns.
9. The air compressor with grooved bearing according to claim 3, characterized in that: The radial groove and / or the thrust groove may be constructed by electrochemical etching or laser engraving.
10. The air compressor with grooved bearing according to claim 3, characterized in that: The radial groove includes a radial groove dam area and a radial groove groove area; and The thrust groove includes a thrust groove dam area and a thrust groove groove area.