An oil-free high-speed blower

Abstract

The present invention relates to the field of blowers, and is an oil-free high-speed blower, wherein the rotor is equipped with an impeller, and a comb-teeth sealing structure is provided between the impeller and the compression shell, so that a hierarchical seal is formed between the compression shell and the impeller; an upper radial grooved bearing and a radial grooved bearing chamber are provided on the upper part of the rotor; a lower thrust grooved bearing and a thrust integrated bearing chamber are provided on the lower part of the rotor; a thrust plate is provided on the rotor, and air pressure is formed between the upper end surface of the thrust integrated bearing chamber and the thrust plate, providing an axial bearing capacity for the rotor. In implementation, the comb-teeth sealing structure can reduce the leakage of high-speed gas to the low-pressure gas inlet and improve the sealing effect. Through the cooperation of the grooved bearing, the bearing chamber, and the thrust plate, the axial and radial bearing capacities are provided for the rotor, ensuring that there is no contact between the grooved bearing and the bearing chamber, reducing wear power consumption and noise, and at the same time, there is no precipitation of lubricating oil, which will not pollute the gas, and the rotor can also reach a higher speed.

Description

Technical Field

[0001] The invention relates to the technical field of blowers, in particular to an oil-free high-speed blower, and more particularly to an oil-free high-speed blower supported by an air-floating grooved bearing. Background Art

[0002] In the prior art, a blower relies on the eccentric operation of a rotor offset in a cylinder, so that the volume changes between the blades in the rotor slots to inhale, compress and expel air. Blowers are usually used in industrial production and environmental protection and other fields to provide functions such as drying, ventilation and exhaust gas discharge.

[0003] Common blowers are generally equipped with oil-containing ball bearings, which may cause the following problems during use:

[0004] 1. The oil-containing ball bearing will release lubricating oil after long-term use, causing oil pollution in the gas blown out by the blower;

[0005] 2. Due to the size limitation of the ball bearing structure, it cannot support higher speed operation. Therefore, the bearing speed of the 4mm rotor blower on the market is 40,000 to 50,000 rpm.

[0006] 3. Under high-speed operation, there will be wear between the ball bearing and the inner and outer bearing sleeves, which will generate loud noise;

[0007] 4. Traditional bearings will generate serious heat, deform or damage after long-term operation, have a short service life, need to be replaced frequently, and increase the cost of use;

[0008] 5. The impeller has no sealing structure, which will cause excessive leakage and lower the efficiency of the whole machine;

[0009] 6. The processing and assembly process of ball bearings is complicated. The bearing monomer needs to be assembled through multiple processes, and the rotor bearings need to be heat-fitted or press-fitted with interference fit. The entire process is complicated and the installation and maintenance costs are high.

[0010] Therefore, the market is in urgent need of an oil-free high-speed blower that is energy-efficient, green and environmentally friendly, and has a simple mechanical structure, few moving parts, good controllability and easy maintenance. Summary of the invention

[0011] The purpose of the present invention is to provide an improved oil-free high-speed blower. Through structural improvement, a contactless fit is formed between the grooved bearing and the bearing chamber, thereby reducing wear and increasing the rotation speed. At the same time, a comb tooth sealing structure is provided to reduce internal leakage of gas and improve the efficiency of the entire machine.

[0012] In order to achieve the above-mentioned purpose, the technical scheme of the present invention is: an oil-free high-speed blower, including a casing, characterized in that: the casing includes a casing body and a compression shell arranged on the upper part of the casing body, a rotor is arranged in the casing, an impeller is arranged on the upper part of the rotor, a comb-tooth sealing structure is arranged between the impeller and the compression shell, so that a hierarchical seal is formed between the compression shell and the impeller; an upper radial grooved bearing and a radial grooved bearing chamber matched with the upper radial grooved bearing are arranged on the upper part of the rotor, an upward air pressure is formed, so that a gas pressure is formed between the upper radial grooved bearing and the radial grooved bearing chamber A contactless fit is formed to provide radial bearing capacity for the rotor; a lower thrust groove bearing and a thrust integrated bearing chamber matched with the lower thrust groove bearing are provided at the lower part of the rotor, forming upward air pressure, so that a contactless fit is formed between the lower thrust groove bearing and the thrust integrated bearing chamber, providing radial bearing capacity for the rotor; a thrust plate is provided on the rotor, and air pressure is formed between the upper end surface of the thrust integrated bearing chamber and the thrust plate, providing axial bearing capacity for the rotor; a low-pressure air inlet is provided on the top of the compression shell, and a high-pressure air outlet is provided on one side of the casing body.

[0013] Preferably, the comb tooth sealing structure includes a top comb tooth structure and a middle comb tooth structure, which cooperate to form a seal between the high pressure air outlet and the low pressure air inlet; an impeller sealing plate is provided at the top of the impeller, and the structure of the impeller sealing plate cooperates with the inner wall of the compression shell, and the top comb tooth structure and the middle comb tooth structure are distributed between the impeller sealing plate and the inside of the compression shell.

[0014] Furthermore, an upturned top tooth is provided at the top of the impeller sealing plate, and a top tooth groove cooperating with the top tooth is provided on the compression shell, and the top tooth groove and the top tooth are combined to form a top comb tooth structure; a plurality of middle teeth are provided in the middle of the impeller sealing plate, and a plurality of middle tooth grooves cooperating with the plurality of middle teeth are provided on the compression shell, and the middle tooth groove and the middle teeth are combined to form a middle comb tooth structure.

[0015] Furthermore, the upper radial grooved bearing and the lower thrust grooved bearing are both engraved with a plurality of herringbone grooves arranged parallel to each other, and gaps are provided between adjacent herringbone grooves, the gaps forming terraces, and the herringbone grooves forming groove areas, so that high-speed gas enters the terrace area from the groove area to form increased gas pressure.

[0016] Furthermore, the compression shell is provided with an air inlet portion and a sealing portion, a raised step is provided between the air inlet portion and the sealing portion, the top tooth groove is provided at the step so that the top tooth groove fits with the air inlet, and a sealing cavity is provided between the top comb tooth structure and the middle comb tooth structure.

[0017] Furthermore, the top comb tooth structure is provided with 1-3 top teeth, the middle comb tooth structure is provided with 6-11 middle teeth, and the height of the top teeth is higher than the height of the middle teeth.

[0018] Furthermore, the radial grooved bearing chamber is provided with an upper inner hole, the upper radial grooved bearing is penetrated in the upper inner hole to form effective air pressure, and the thrust integrated bearing chamber is provided with a lower inner hole, the lower thrust grooved bearing is penetrated in the lower inner hole to form effective air pressure.

[0019] Compared with the prior art, the technical solution of the present invention not only improves the overall technical solution, but also includes many improvements in details. Specifically, it has the following beneficial effects:

[0020] 1. The improved scheme described in the present invention is that the upper part of the rotor is provided with an upper radial grooved bearing and a radial grooved bearing chamber matched with the upper radial grooved bearing, forming an upward air pressure, so that the upper radial grooved bearing and the radial grooved bearing chamber form a contactless match, providing radial bearing capacity for the rotor; the lower part of the rotor is provided with a lower thrust grooved bearing and a thrust integrated bearing chamber matched with the lower thrust grooved bearing, forming an upward air pressure, so that the lower thrust grooved bearing and the thrust integrated bearing chamber form a contactless match, providing radial bearing capacity for the rotor, there is no lubricating oil between the grooved bearing and the grooved bearing chamber of the present invention, and the problem of lubricating oil precipitation and gas pollution will not occur. At the same time, the contactless bearing can provide a higher rotation speed for the rotor, and the rotation speed of a rotor with a size of 4mm can reach millions of revolutions per minute;

[0021] 2. In the technical solution of the present invention, a comb-teeth sealing structure is provided between the impeller and the compression shell, so that a hierarchical seal is formed between the compression shell and the impeller, thereby reducing the internal leakage of high-pressure gas and improving the efficiency of the whole machine;

[0022] 3. In the structure of the present invention, an integrated thrust plate is provided on the rotor, and air pressure is formed between the upper end surface of the thrust integrated bearing chamber and the thrust plate to provide axial bearing capacity for the rotor. The upper radial grooved bearing and the lower thrust grooved bearing are both engraved with a plurality of herringbone grooves arranged parallel to each other, and gaps are provided between adjacent herringbone grooves, the gaps form a terrace area, and the herringbone grooves form a groove area, so that high-speed gas enters the terrace area from the groove area to form an increased air pressure. At the same time, the processing and installation methods of the grooved bearings are simple, no press-fitting is required, and the cost is low;

[0023] 4. The present invention has a simple structure, reasonable layout, convenient assembly, is green and environmentally friendly, and is easy to promote and utilize. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention.

[0025] Figure 2 It is a schematic structural diagram of the rotor of the present invention.

[0026] Figure 3 Schematic diagram of the flow of airflow under the action of the comb teeth sealing structure in an embodiment of the present invention.

[0027] Figure 4 It is a partially enlarged schematic diagram of the upper radial groove bearing of the present invention.

[0028] Figure 5 for Figure 4 Sectional view along AA direction.

[0029] Figure 6 It is a partial enlarged schematic diagram of the end portion of the lower thrust groove bearing of the present invention.

[0030] Reference numerals:

[0031] 1 compression shell, 2 impeller sealing plate, 3 radial groove bearing chamber, 4 upper radial groove bearing, 5 thrust plate, 6 thrust integrated bearing chamber, 7 lower thrust groove bearing, 8 low pressure air inlet, 9 high pressure air outlet, 10 motor winding assembly;

[0032] 11 comb teeth sealing structure, 12 raised step;

[0033] 21 top comb tooth structure, 22 middle comb tooth structure;

[0034] 41 platform areas, 42 slot areas. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] The present invention provides an oil-free high-speed blower, including a casing, Figure 1 The difference between the present invention and the prior art is that the casing includes a casing body and a compression shell 1 arranged on the upper part of the casing body, a rotor is arranged in the casing, an impeller is arranged on the upper part of the rotor, a comb seal structure 11 is arranged between the impeller and the compression shell, so that a hierarchical seal is formed between the compression shell 1 and the impeller; an upper radial grooved bearing 4 and a radial grooved bearing chamber 3 matched with the upper radial grooved bearing 4 are arranged on the upper part of the rotor, forming an upward air pressure, so that a contactless fit is formed between the upper radial grooved bearing 4 and the radial grooved bearing chamber 3, providing the rotor with a stable and stable performance. Radial bearing capacity; the lower part of the rotor is provided with a lower thrust groove bearing 7 and a thrust integrated bearing chamber 6 matched with the lower thrust groove bearing, forming an upward air pressure, so that the lower thrust groove bearing 7 and the thrust integrated bearing chamber 6 form a contactless fit, providing radial bearing capacity for the rotor; a thrust plate 5 is provided on the rotor, and air pressure is formed between the upper end surface of the thrust integrated bearing chamber and the thrust plate, providing axial bearing capacity for the rotor; a low-pressure air inlet 8 is provided on the top of the compression shell, and a high-pressure air outlet 9 is provided on one side of the casing body.

[0037] During implementation, due to the comb-teeth seal structure between the impeller and the compression shell, a sealing structure is formed between the compression shell and the impeller, which reduces the leakage of high-speed gas to the low-pressure gas inlet and improves the sealing effect. At the same time, the rotor is provided with an upper radial grooved bearing and a lower thrust grooved bearing. Through the cooperation of the grooved bearing, the bearing chamber and the thrust plate, the axial and radial bearing capacity is provided for the rotor, ensuring that there is no contact between the grooved bearing and the bearing chamber, reducing wear power consumption and noise, and at the same time, there is no lubricating oil precipitation, which will not pollute the gas, and also enables the rotor to reach a higher speed.

[0038] Example 1

[0039] In this embodiment, the casing includes a casing body and a compression shell 1 arranged on the upper part of the casing body. A rotor is arranged in the casing, and an impeller is installed on the upper part of the rotor. A comb-tooth sealing structure 11 is arranged between the impeller and the compression shell, so that a hierarchical seal is formed between the compression shell and the impeller, thereby avoiding leakage of high-pressure gas to the low-pressure outlet and improving the efficiency of the whole machine.

[0040] Further, if Figure 2 As shown, an upper radial grooved bearing 4 and a radial grooved bearing chamber 3 matched with the upper radial grooved bearing are provided at the upper part of the rotor. After the rotor rotates, upward air pressure is formed, so that a contactless fit is formed between the upper radial grooved bearing and the radial grooved bearing chamber, thereby providing a radial bearing capacity for the rotor; a lower thrust grooved bearing 7 and a thrust integrated bearing chamber 6 matched with the lower thrust grooved bearing are provided at the lower part of the rotor. After the rotor rotates, upward air pressure is formed, so that a contactless fit is formed between the lower thrust grooved bearing and the thrust integrated bearing chamber, thereby providing a radial bearing capacity for the rotor; a thrust plate 5 is provided on the rotor. After the rotor rotates, air pressure is formed between the upper end surface of the thrust integrated bearing chamber and the thrust plate, thereby providing an axial bearing capacity for the rotor. There is no lubricating oil between the grooved bearing and the grooved bearing chamber of the present invention, thereby not causing the problem of lubricating oil precipitation and gas pollution. Meanwhile, the contactless bearing can provide a higher rotation speed for the rotor. The rotation speed of a rotor with a size of 4 mm can reach millions of revolutions per minute. A low-pressure air inlet is provided on the top of the compression shell, and a corresponding high-pressure air outlet is provided on one side of the shell body.

[0041] Specifically, the comb tooth sealing structure includes a top comb tooth structure 21 and a middle comb tooth structure 22. The top comb tooth structure and the middle comb tooth structure cooperate to form a sealing structure between the high pressure air outlet and the low pressure air inlet to prevent the high pressure gas from leaking toward the low pressure air inlet. Figure 3As shown, it is a schematic diagram of the flow of air under the action of the comb-tooth sealing structure. Further, an impeller sealing plate 2 is provided at the top of the impeller, and the structure of the impeller sealing plate matches the inner wall of the compression shell, and a top comb-tooth structure and a middle comb-tooth structure are distributed between the impeller sealing plate and the inside of the compression shell. The impeller sealing plate is in an arc shape, and the arc shape matches the shape of the inner wall of the compression shell, achieving a good sealing effect.

[0042] Furthermore, an upturned top tooth is provided at the top of the impeller sealing plate, and a top tooth groove cooperating with the top tooth is provided on the compression shell, and the top tooth groove and the top tooth are combined to form a top comb tooth structure 21; a plurality of middle teeth are provided in the middle of the impeller sealing plate, and a plurality of middle tooth grooves cooperating with the plurality of middle teeth are provided on the compression shell, and the middle tooth groove and the middle teeth are combined to form a middle comb tooth structure 22.

[0043] In the upper radial groove bearing (such as Figure 4 , Figure 5 As shown in the figure, the groove angle β of the herringbone groove is in the range of 30°-60°, and the preferred angle is 55°; the number of grooves is N, N=(1-3)×R rounded, where R is the radius of the upper radial grooved bearing; the groove-platform ratio is bg / (bg+br), and the groove-platform ratio ranges from 0.4 to 0.7, where bg is the groove width, br is the platform width, and the groove depth h is one thousandth to two thousandths of the radius R of the upper radial grooved bearing. Specifically, the groove area is processed by laser or etching, and the groove area and the platform area are processed alternately. The edge of the groove area is processed to the edge of the width direction of the upper radial grooved bearing, and is connected to the surrounding environment, which is conducive to forming high air pressure by using the pumping effect.

[0044] In the lower thrust groove bearing, the groove curve of the spiral groove is a logarithmic spiral under polar coordinates. The equation of the logarithmic spiral is R=Rg*e^(α*tan(β), where R is the polar radius of the spiral and Rg is the base circle radius of the logarithmic spiral (given by Figure 6 As shown in the figure, the inner diameter of the groove area of ​​the lower thrust groove bearing is the base circle radius), α is the spiral angle, which can reflect the degree of twisting of the spiral line, β is the angular coordinate under polar coordinates, which is the angular coordinate of a point on a single spiral line; the groove-to-platform ratio is αg / (αr+αg), and the value range of the groove-to-platform ratio is 0.3-0.6, where αg is the groove area angle and αr is the platform angle. Specifically, the groove area angle and the platform angle are determined according to the number of grooves in the whole circumference. For example, if 20 grooves are set within the circumference, the relationship between the groove area angle and the platform angle can be determined, and then the groove area angle and the platform angle can be determined according to the groove-to-platform ratio. Figure 6In the figure, Rg is the inner diameter of the groove area, Ro is the outer diameter of the lower thrust groove bearing, and Ri is the inner hole radius of the lower thrust groove bearing. Specifically, the groove type adopts a quasi-spiral groove, the groove area and the platform area are processed alternately, and the outer edge of the groove area is processed to the edge in the radial direction, which is connected to the surrounding environment. The base circle radius of the logarithmic spiral line is generally larger than the inner diameter, so that when the airflow is pumped inward along the spiral line, it encounters the platform area and then increases the air pressure, which is conducive to forming high air pressure by utilizing the pumping effect.

[0045] In this embodiment, the compressor shell is provided with an air inlet and a sealing part, a raised step 12 is provided between the air inlet and the sealing part, the top tooth groove is provided at the step, so that the top tooth groove fits with the air inlet, and a sealing cavity is provided between the top comb tooth structure and the middle comb tooth structure. The top comb tooth structure is provided with 1 top tooth, and the middle comb tooth structure is provided with 7 middle teeth, and the height of the top tooth is higher than the height of the middle tooth. The height of the middle teeth is gradual, and they are arranged one by one from high to low from the end close to the top teeth, and the height of the latter one is reduced by 6% compared with the previous one. The width of the middle teeth is also gradual, and the width of the latter one is reduced by 5% compared with the previous one, and they are arranged one by one from wide to narrow from the end close to the top teeth. A comb tooth sealing structure is provided between the impeller and the compressor shell here, so that a hierarchical seal is formed between the compressor shell and the impeller, reducing the internal leakage of high-pressure gas and improving the efficiency of the whole machine.

[0046] The oil-free high-speed blower of the present invention adopts automotive-grade oil-free reliable dynamic pressure air suspension bearings, which are friction-free and have low mechanical losses during operation. It can provide a higher speed for the rotor. The speed of a 4mm-sized rotor can reach one million revolutions per minute, and it only takes 5 seconds to reach full speed. In addition, the motor efficiency of the oil-free high-speed blower is as high as 97%, meeting the double first-level energy efficiency standards. The special integrated design of the main engine makes the noise less than 75dB(A) and the vibration less than 12μm. It also supports stepless adjustment, the fan can start and stop quickly, and the number of continuous starts and stops exceeds 200,000 times.

[0047] The grooved air bearing high-speed blower of the present invention is not an ordinary oil-free air bearing. In the prior art, it is not practical to manufacture such a small foil air bearing, and the static pressure air bearing requires an additional air supply system. The air bearing high-speed blower of the present invention has its unique advantages.

[0048] Example 2

[0049] The oil-free high-speed blower of the present invention comprises a casing, which comprises a casing body and a compression shell 1 arranged on the upper part of the casing body. A rotor is arranged in the casing, and an impeller is arranged on the upper part of the rotor. A low-pressure air inlet 8 is arranged on the top of the compression shell, and a high-pressure air outlet 9 is arranged on one side of the casing body. A comb-tooth sealing structure 11 is arranged between the impeller and the compression shell, so that a hierarchical seal is formed between the compression shell and the impeller, which is actually equivalent to setting a series of hierarchical sealing structures between the high-pressure air outlet and the low-pressure air inlet, so that the high-pressure gas reduces the speed and pressure, greatly reducing the leakage of the high-pressure gas. At the same time, this comb-tooth sealing structure is progressive layer by layer and connected in rings, so that the best sealing effect can be produced without affecting the high-speed rotation of the impeller.

[0050] The comb tooth sealing structure includes a top comb tooth structure 21 and a middle comb tooth structure 22. The top comb tooth structure and the middle comb tooth structure cooperate to form a seal between the high pressure air outlet and the low pressure air inlet. An impeller sealing plate 2 is provided at the top of the impeller. The structure of the impeller sealing plate cooperates with the inner wall of the compression shell. The top comb tooth structure and the middle comb tooth structure are distributed between the impeller sealing plate and the inside of the compression shell. The top comb tooth structure is provided with 2 top teeth, and the middle comb tooth structure is provided with 9 middle teeth. The height of the top teeth is higher than the height of the middle teeth.

[0051] At the same time, an upper radial grooved bearing 4 and a radial grooved bearing chamber 3 matched with the upper radial grooved bearing are provided on the upper part of the rotor. During the rotation of the rotor, upward air pressure is formed, so that a contactless fit is formed between the upper radial grooved bearing and the radial grooved bearing chamber, thereby providing radial bearing capacity for the rotor; a lower thrust grooved bearing 7 and a thrust integrated bearing chamber 8 matched with the lower thrust grooved bearing are provided on the lower part of the rotor. During the rotation of the rotor, upward air pressure is formed, so that a contactless fit is formed between the lower thrust grooved bearing and the thrust integrated bearing chamber, thereby providing radial bearing capacity for the rotor; a thrust plate 5 is provided on the rotor. During operation, air pressure is formed between the upper end surface of the thrust integrated bearing chamber and the thrust plate, thereby providing axial bearing capacity for the rotor.

[0052] Specifically, there are gaps between the upper radial grooved bearing and the radial grooved bearing chamber, and between the lower thrust grooved bearing and the thrust integrated bearing chamber. Usually, the setting value of the gap varies according to the outer diameter of the radial grooved bearing. The general value of the gap is one thousandth of the outer diameter of the rotor. This gap value can enable the two to achieve the best air pressure formation effect, while providing sufficient axial bearing capacity to achieve an oil-free air floating support effect.

[0053] Furthermore, the upper radial grooved bearing and the lower thrust grooved bearing are both engraved with a plurality of herringbone grooves arranged in parallel with each other, and gaps are provided between adjacent herringbone grooves, the gaps forming a terrace 41, and the herringbone grooves forming a groove 42, so that high-speed gas enters the terrace from the groove area to form an increased gas pressure. The radial grooved bearing chamber is provided with an upper inner hole, and the upper radial grooved bearing is penetrated in the upper inner hole, so that the rotor forms an effective gas pressure during operation, and the thrust integrated bearing chamber is provided with a lower inner hole, and the lower thrust grooved bearing is penetrated in the lower inner hole, so that the rotor forms an effective gas pressure during operation.

[0054] An integrated thrust plate 5 is provided on the rotor. During operation, air pressure is formed between the upper end surface of the thrust integrated bearing chamber and the thrust plate to provide axial bearing capacity for the rotor. The upper radial grooved bearing and the lower thrust grooved bearing are both engraved with a plurality of herringbone grooves arranged parallel to each other. Gaps are provided between adjacent herringbone grooves. The gaps form a terrace area, and the herringbone grooves form a groove area, so that high-speed gas enters the terrace area from the groove area to form increased air pressure. At the same time, the processing and installation methods of the grooved bearings are simple, no pressing is required, and the cost is low.

[0055] The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to the above descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the scope of protection of the present invention.

Claims

1. An oil-free high-speed blower, comprising a casing, characterized in that: The casing includes a casing body and a compression shell arranged on the upper part of the casing body. A rotor is arranged in the casing. An impeller is arranged on the upper part of the rotor. A comb seal structure is arranged between the impeller and the compression shell, so that a hierarchical seal is formed between the compression shell and the impeller. An upper radial groove bearing and a radial groove bearing chamber matched with the upper radial groove bearing are provided on the upper part of the rotor, forming upward air pressure, so that a non-contact fit is formed between the upper radial groove bearing and the radial groove bearing chamber, providing radial bearing capacity for the rotor; The lower part of the rotor is provided with a lower thrust groove bearing and a thrust integrated bearing chamber matched with the lower thrust groove bearing, forming an upward air pressure, so that a contactless match is formed between the lower thrust groove bearing and the thrust integrated bearing chamber, providing radial bearing capacity for the rotor; A thrust plate is provided on the rotor, and air pressure is formed between the upper end surface of the thrust integrated bearing chamber and the thrust plate to provide axial bearing capacity for the rotor; A low-pressure air inlet is provided at the top of the compression shell, and a high-pressure air outlet is provided on one side of the casing body; the comb tooth sealing structure includes a top comb tooth structure and a middle comb tooth structure, and the top comb tooth structure and the middle comb tooth structure cooperate to form a seal between the high-pressure air outlet and the low-pressure air inlet; an impeller sealing plate is provided at the top of the impeller, and the structure of the impeller sealing plate cooperates with the inner wall of the compression shell, and the top comb tooth structure and the middle comb tooth structure are distributed between the impeller sealing plate and the inside of the compression shell.

2. An oil-free high-speed blower according to claim 1, characterized in that: The top of the impeller sealing plate is provided with an upturned top tooth, and the compression shell is provided with a top tooth groove matched with the top tooth, and the top tooth groove and the top tooth are combined to form a top comb tooth structure; the middle part of the impeller sealing plate is provided with a plurality of middle teeth, and the compression shell is provided with a plurality of middle tooth grooves matched with the plurality of middle teeth, and the middle tooth groove and the middle teeth are combined to form a middle comb tooth structure.

3. The oil-free high-speed blower according to claim 1, characterized in that: The upper radial grooved bearing and the lower thrust grooved bearing are both engraved with a plurality of herringbone grooves or quasi-spiral grooves arranged in parallel with each other, and gaps are provided between adjacent herringbone grooves or quasi-spiral grooves, the gaps forming terraces, and the herringbone grooves forming groove areas, so that high-speed gas enters the terrace area from the groove area, forming an increased gas pressure.

4. The oil-free high-speed blower according to claim 3, characterized in that: In the upper radial grooved bearing, the groove angle β of the herringbone groove ranges from 30° to 60°; the number of grooves is N, N=(1-3)×R rounded up, where R is the radius of the upper radial grooved bearing; the groove-platform ratio is bg / (bg+br), and the groove-platform ratio ranges from 0.4 to 0.7, where bg is the groove width, br is the platform width, and the groove depth is from one thousandth to two thousandths of the radius R of the upper radial grooved bearing.

5. The oil-free high-speed blower according to claim 3, characterized in that: In the lower thrust groove bearing, the groove curve of the spiral groove is a logarithmic spiral line under polar coordinates, the groove-platform ratio is αg / (αr+αg), and the groove-platform ratio ranges from 0.3 to 0.6, where αg is the groove area angle and αr is the platform area angle.

6. The oil-free high-speed blower according to claim 2, characterized in that: The compression shell is provided with an air inlet portion and a sealing portion, a raised step is provided between the air inlet portion and the sealing portion, a top tooth groove is provided at the step so that the top tooth groove fits with the air inlet, and a sealing cavity is provided between the top comb tooth structure and the middle comb tooth structure.

7. The oil-free high-speed blower according to claim 2, characterized in that: The top comb tooth structure is provided with 1-3 top teeth, the middle comb tooth structure is provided with 6-11 middle teeth, and the height of the top teeth is higher than the height of the middle teeth.

8. The oil-free high-speed blower according to claim 1, characterized in that: The radial grooved bearing chamber is provided with an upper inner hole, and the upper radial grooved bearing is penetrated in the upper inner hole to form effective air pressure. The thrust integrated bearing chamber is provided with a lower inner hole, and the lower thrust grooved bearing is penetrated in the lower inner hole to form effective air pressure.

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