Air suspension blower with air leakage prevention structure

Abstract

The invention discloses an air suspension blower with an air leakage prevention structure, and belongs to the field of air suspension blowers. The problem to be solved is to prevent high-pressure gas from passing through a gap between the back of an impeller and an adjacent part and then entering each fit gap between the interior of an air bearing and related parts of a motor shaft. The air suspension blower with the air leakage prevention structure comprises a motor, an impeller driven by the motor and a volute outside the impeller. A thrust disc is further arranged on the motor shaft and supported by the air-suspending bearing mechanism, and particularly, a sealing ring is arranged on the thrust disc, so that high-pressure gas on the back of an impeller is prevented from leaking into a gap between the air-suspending bearing mechanism and related parts on the motor shaft; the impeller is mainly used for improving the air outlet rate, improving the dynamic balance of the impeller and hindering abrasion of an air bearing mechanism.

Description

Technical Field

[0001] The invention belongs to the field of air suspension blowers, and in particular relates to an air suspension blower with an air leakage prevention structure. Background Art

[0002] One of the characteristics of air suspension blowers is high-speed operation, such as Figure 1 As shown in the figure, the air inlet E of the volute is a low-pressure area. During the gas compression process of the three-dimensional flow centrifugal impeller, the pressure on the blade surface increases radially with the increase of radius, and the outer edge of the impeller is the high-pressure area; and because there is a gap between the back of the impeller and the adjacent parts, the high-pressure gas leaks out from the gap and is discharged from the set exhaust holes or other assembly gaps; the pressure difference between the high-pressure area O and the low-pressure area E can make the impeller subject to an axial force toward the volute inlet, and this force pushes the impeller to move toward the volute inlet. If the axial force is too large, it will also cause wear of the axial thrust bearing.

[0003] In order to prevent high-pressure gas from passing through the gap between the back of the impeller and the adjacent thrust bearing seat, and entering the various matching gaps between the air bearing and the relevant parts on the motor shaft, a number of meshing comb teeth are usually arranged on the outer edge of the back of the impeller and the adjacent parts to form a non-contact sealing structure, thereby reducing the pressure on the back of the impeller, reducing the axial force caused by pressure imbalance, and reducing the internal leakage of the blower, such as Figure 2 The air suspension blower shown in the figure has a grate meshing on the back of the impeller. The air pressure inside is as follows: Figure 7 P shown in 1 Line to P 2 Line changes: P 2 Line in Figure 1 and Figure 2 O 1 There is a qualitative change in air pressure, but the centrifugal force generated by the impeller at high speed will cause problems such as impeller deformation, and the grate gap cannot be very small, so the grate structure has limited effect. In fact, there is still a part of high-pressure gas that leaks through the back of the impeller to the gaps between the air bearing assembly and the motor shaft. Although the grate on the outer edge of the impeller has a decompression effect on the high-pressure gas, the gas pressure is still high, so the axial force cannot be greatly reduced, and the air outlet efficiency of the fan is not high. Summary of the invention

[0004] The present invention makes up for the defects in the background technology and overcomes the consequences caused by air leakage from the back of the impeller into the gaps between related parts on the motor shaft: wear of the thrust bearing of the air suspension bearing, low fan efficiency and other problems.

[0005] The disclosed air suspension blower with an anti-leakage structure includes a motor and an impeller driven by the motor; the impeller is mounted on the motor shaft, and a thrust plate and the impeller are fastened and mounted on the motor shaft in sequence, together forming a high-speed rotating part of the air suspension blower; the present invention configures an air suspension bearing mechanism for the thrust plate, whereby the front thrust bearing and the rear thrust bearing are configured on both axial sides of the thrust plate, respectively mounted on the front thrust bearing seat and the rear thrust bearing seat; the front thrust bearing seat is adjacent to the impeller, and the two are meshed with each other near the outer edge of the impeller by a plurality of rings of comb teeth; the outside of the impeller is installed with a volute, The volute, front thrust bearing seat and rear thrust bearing seat, as well as the parts of the motor except the motor shaft, are all stationary parts fixedly installed on the air suspension blower; when the motor shaft rotates at high speed, the air layers located on both sides of the axial direction of the thrust plate, that is, the air film between the front thrust bearing and the thrust plate, and the air film between the thrust plate and the rear thrust bearing, become dynamic pressure gas bearings, which will generate supporting force to overcome the axial force; in particular, there is also a sealing ring fastened to the front thrust bearing seat, which is assembled with the outer surface of the thrust plate to form a sealed cavity, and the sealing ring is also a stationary part that does not rotate with the motor shaft.

[0006] The above technical solution is based on the meshing and leak-proofing of the grate teeth on the back of the impeller, and adds another seal on the flow path of the high-pressure gas, thereby forming a high-pressure cavity on the front side of the thrust plate, generating a force in the opposite direction of the axial force, thereby reducing the load on the thrust bearing and increasing the life of the thrust bearing. This solution is because the grate teeth at the outer edge of the impeller have a decompression effect on the high-pressure gas, but the gas pressure is still high, and then a secondary seal is performed through the sealing ring set on the outer surface of the thrust plate.

[0007] Further optimization is to make the matching part between the inner surface of the sealing ring and the thrust plate into a structure with comb teeth. Such a structure can not only further reduce the pressure when the high-pressure gas passes through, but also, due to the existence of the seal at this place, the closed cavity between the front thrust bearing and the thrust plate forms a certain high-pressure area, and the pressure generated is opposite to the axial force generated by the pressure on the back of the impeller, thereby offsetting part of the axial force.

[0008] Optionally, after the sealing ring is installed at the thrust plate, the meshing comb teeth on the back of the impeller are directly removed, and the sealing structure is moved to the thrust plate with a thicker wall. This not only reduces the imbalance of the impeller, but also reduces the processing cost, improves the bearing capacity of the components, and makes the related performance more reliable.

[0009] Optionally, the impeller and the thrust plate are mounted on the motor shaft through screws; the volute, the front thrust bearing seat, and the rear thrust bearing seat are assembled on the motor; and the sealing ring is mounted on the front thrust bearing seat using screws.

[0010] The implementation of the above series of technical solutions enables the product after the implementation of the present invention to have the following advantages: Reduces the load on the thrust bearing and increases the bearing life; Reduce internal leakage and improve fan efficiency; Simplify the impeller structure and reduce processing costs.

[0011] Effectively prevent the whole machine vibration caused by axial unbalanced force, etc.

[0012] Therefore, the problems existing in the background technology are effectively solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Basic structure of air suspension blower and its air flow diagram Figure 2 Schematic diagram of the anti-leakage structure and airflow of the meshing grate on the back of the impeller Figure 3 Schematic diagram of the air suspension blower's anti-leakage structure with a sealing ring Figure 4 Schematic diagram of the structure of the sealing ring with comb teeth Figure 5 against Figure 4 Schematic diagram of the enlarged part at I in the middle Figure 6 Schematic diagram of the anti-leakage structure without the meshing grate teeth on the back of the impeller Figure 7 Corresponds to Figure 1~Figure 4 The internal air pressure line P of the blower 1 ~P 4 Relative relationship diagram Figure 8 correspond Figure 5 Internal air pressure line P of the structure 5 With P 4 , P 1 Relative relationship diagram In the diagram, 1. volute 2. front thrust bearing seat 3. seal ring 31 seal ring grate 4. impeller 41 impeller grate 5. rear thrust bearing seat 6. thrust plate 7A. front thrust bearing 7B. rear thrust bearing 8. motor shaft 9. screw 10. screw 11. motor 12. exhaust hole Figure 7 and Figure 8 In, P 1 Line corresponds to the structure without any teeth; P 2 The line corresponds to the meshing of the grate teeth only on the back of the impeller, with the turning point at O 1 ;P 3 The line corresponds to the addition of a sealing ring and an additional turning point O 3 ; P4 Line corresponds to the seal ring with comb teeth; P 5 The line corresponds to the back of the impeller after the grate teeth have been removed. Example 1

[0014] like Figure 3 The technical solution of the embodiment shown in the figure discloses an air suspension blower with an anti-leakage structure, including a motor 11 and an impeller 4 driven by the motor 11; the impeller 4 is mounted on the motor shaft 8, and a thrust plate 6 and the impeller 4 are fastened and mounted on the motor shaft 8 in sequence, together forming the rotating part of the air suspension blower; the thrust plate 6 is provided with an air suspension bearing mechanism, and thus, the thrust plate 6 is provided with: a front thrust bearing 7A and a rear thrust bearing 7B on both axial sides, which are respectively mounted on the front thrust bearing seat 2 and the rear thrust bearing seat 5; the front thrust bearing seat 2 is adjacent to the impeller 4, and the two are connected by comb teeth 41 near the outer edge of the impeller. meshing with each other; the volute 1 is installed on the outside of the impeller 4, and the volute 1, the front thrust bearing seat 2 and the rear thrust bearing seat 5, and the parts of the motor 11 except the motor shaft are all fixed and stationary parts on the air suspension blower; when the motor shaft 8 rotates at a high speed, the air layers on both sides of the axial direction of the thrust plate 6, that is, the air film between the front thrust bearing 7A and the thrust plate 6, and the air film between the thrust plate 6 and the rear thrust bearing 7B, become dynamic pressure gas bearings, which will generate supporting force to overcome the axial force; in particular, there is also a sealing ring 3 fastened to the front thrust bearing, which is assembled with the outer surface of the thrust plate 6, forming an air pressure from O 1 ~O 2 ~O 3 The sealing ring 3 also belongs to the stationary part that does not rotate with the motor shaft 8; although the sealing ring 3 can be as Figure 3 The smooth inner surface shown in FIG. 1 is matched with the thrust plate 6, and the internal pressure change curve is shown in FIG. 3 Line shown.

[0015] However, in this embodiment, the Figure 4 As shown in the further optimized structure, comb teeth 31 are provided on the inner ring surface of the sealing ring 3; in this embodiment, the impeller and thrust plate are installed on the motor shaft through screws; the volute, front thrust bearing seat and rear thrust bearing seat are assembled on the motor; the sealing ring with comb teeth on the inner surface is installed on the front thrust bearing seat by screws.

[0016] When the sealing ring 3 is also provided with comb teeth, the effect of hindering the airflow is better. Figure 7 P 4 Line, with P 3 Compared with the line, although the same in O 3 The qualitative change begins to decrease at O 4 At point P4 The value of the line is P 3 The line value is closer to the ideal value. Example 2

[0017] like Figure 6 As shown: Based on the technical solution of Example 1, the cost and performance ratio are further optimized, and the comb teeth 41 meshing between the back of the impeller 4 and the front thrust bearing seat 2 are directly eliminated, leaving only the sealing cavity formed between the sealing ring 3 with comb teeth 31 fixedly mounted on the front thrust bearing seat 2 and the thrust plate 6. The change of internal air pressure is shown in Figure 8 The P shown 5 Line, only in O 3 With O 4 There is a qualitative change between 4 The twists and turns of the plan are the same, although the specific air pressure values ​​are different.

[0018] In summary, the air suspension blower with an anti-leakage structure of the present invention effectively solves the problem of air leakage in the high-pressure area of ​​the impeller outlet and overcomes the consequences of air leakage. The technical effects of the present invention are: reducing the wear of the thrust bearing; reducing internal leakage, improving the air output rate of the blower; simplifying the impeller structure, reducing processing costs, and effectively preventing axial unbalanced forces. We have benefited greatly from the implementation process and the effects after implementation.

Claims

1. An air suspension blower with an anti-leakage structure comprises a motor and an impeller driven by the motor; the impeller is mounted on the motor shaft, and a thrust plate and the impeller are fastened and mounted on the motor shaft in sequence, together forming a rotating part of the air suspension blower; an air suspension bearing mechanism is configured for the thrust plate, and thus, a front thrust bearing and a rear thrust bearing are configured on both axial sides of the thrust plate, which are respectively mounted on the front thrust bearing seat and the rear thrust bearing seat; the front thrust bearing seat is adjacent to the impeller, and the two are spaced apart by a distance of about 100 mm. The outer edge of the impeller is meshed with a number of circles of teeth; the impeller is externally mounted with a volute, and the volute, the front thrust bearing seat, the rear thrust bearing seat, and the motor components except the motor shaft are all fixed and stationary parts of the air suspension blower; when the motor shaft rotates at high speed, the air layers on both sides of the thrust plate, i.e., the air film between the front thrust bearing and the thrust plate, and the air film between the thrust plate and the rear thrust bearing, become dynamic pressure gas bearings; the air suspension blower with an anti-leakage structure, It is characterized in that There is also a sealing ring fastened on the front thrust bearing, which cooperates with the outer surface of the thrust plate. The sealing ring also belongs to the stationary part that does not rotate with the motor shaft.

2. The air suspension blower with an air leakage prevention structure according to claim 1, It is characterized in that The inner surface of the sealing ring fastened on the front thrust bearing seat and the matching position of the thrust plate are also made into a structure with hedge teeth.

3. The air suspension blower with an air leakage prevention structure as claimed in claim 2, It is characterized in that The structure in which several circles of hedge teeth mesh with each other on the back of the outer edge of the impeller is cancelled.

4. The air suspension blower with an anti-leakage structure as claimed in any one of the preceding claims, It is characterized in that The impeller and thrust plate are fastened to the motor shaft by screws; the volute, the front thrust bearing seat and the rear thrust bearing seat are fastened to the motor; and the sealing ring is fastened to the front thrust bearing seat by screws.

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