Air blower driven by air floating shaft

Abstract

The invention relates to the technical field of air treatment, in particular to an air blower driven by an air floating shaft, which comprises an air blower body, the air blower body comprises a shell and a motor, the motor is externally arranged on the shell, an air suspension bearing is arranged in the air blower body, and a bearing air inlet and a bearing air outlet are formed in the shell of the air blower body. The air suspension bearing is connected with an air supply system through a bearing air inlet and a bearing air outlet, the air supply system comprises an air inlet pipe and an air outlet pipe, a filter screen is arranged in the air inlet pipe, and a heating device is arranged on the outer wall of the air inlet pipe. The air suspension bearing can be heated, the negative effects of friction and abrasion increase caused by polluted air on the bearing are avoided, the service life of the bearing is prolonged, air of the air suspension bearing can be heated, the negative effects of gas viscosity increase and gas film rigidity reduction caused by low-temperature air on the bearing are avoided, and therefore the stability of the bearing is improved.

Description

Technical Field

[0001] The invention relates to the technical field of air treatment, in particular to a blower driven by an air floating shaft. Background Art

[0002] In the air compression station, the blower provides air to the station and maintains the air pressure in the station stable. There are many types of blowers, including those driven by air-floating shafts. Such blowers can be composed of ultra-high-speed direct-connected motors, air-floating bearings and high-precision single-stage centrifugal impellers. Since air-floating bearings use the air film formed by the continuously flowing gas as a lubricant, blowers driven by air-floating shafts have the advantage of low noise.

[0003] However, the stability and life of blowers such as those mentioned above that use air suspension bearings for noise reduction are easily affected by temperature and air quality. For example, low temperature will increase the viscosity of the gas in the air suspension bearing and reduce the stiffness of the air film. The bearing may vibrate or become unstable. Increased dust and particulate matter in the air will contaminate the air film, increase friction and wear of the bearing, and reduce the life of the bearing. Therefore, improvement is needed. Summary of the invention

[0004] In order to solve the problems existing in the prior art, the present application provides a blower driven by an air floating shaft.

[0005] The present invention provides a blower driven by an air floating shaft, which adopts the following technical solution:

[0006] A blower driven by an air floating shaft comprises a blower body, wherein the blower body comprises a shell and a motor, the motor is externally arranged on the shell, an air suspension bearing is arranged inside the blower body, the outer shell of the blower body is provided with a bearing air inlet and a bearing air outlet, the air suspension bearing is connected to an air supply system via the bearing air inlet and the bearing air outlet, the air supply system comprises an air inlet pipe and an air outlet pipe, a filter is arranged inside the air inlet pipe, and a heating device is arranged on the outer wall of the air inlet pipe.

[0007] Preferably, the air outlet pipe passes through the air inlet pipe to form an intersection.

[0008] Preferably, the air outlet pipe is divided into a heat exchange section and a non-heat exchange section, the heat exchange section of the air outlet pipe is located inside the air inlet pipe, and fins are provided on the outer wall of the heat exchange section.

[0009] Preferably, the inner wall of the heat exchange section is provided with spiral blades.

[0010] Preferably, the air outlet pipe is a circular pipe, the heat exchange section is rotatably arranged between the two non-heat exchange sections, and the heat exchange section keeps rotating during the heat exchange process.

[0011] Preferably, a plurality of fins are provided on the outer wall of the heat exchange section, and the plurality of fins are evenly distributed around the axis of the heat exchange section.

[0012] Preferably, the windward surface of the fin is concave inwardly.

[0013] Preferably, the air inlet pipe is divided into a heating section and a non-heating section, the heating device is arranged in the heating section of the air inlet pipe, the heating section of the air inlet pipe and the air outlet pipe are made of copper pipes, and the non-heating section of the air inlet pipe is made of plastic pipe or fiberglass pipe.

[0014] Preferably, the heating device controls the intake air temperature to be in the range of 20°C to 40°C.

[0015] Preferably, a heat insulation layer is provided between the motor and the housing, and the heat insulation layer is a rubber layer.

[0016] The beneficial effects of the present invention are:

[0017] 1. Based on the above improvements, on the one hand, the filter can filter the air entering the air suspension bearing to avoid the negative impact of increased friction and wear on the bearing caused by polluted air, thereby extending the life of the bearing. On the other hand, the heating device can heat the air entering the air suspension bearing to avoid the negative impact of increased gas viscosity and decreased air film stiffness caused by low-temperature air on the bearing, thereby improving the stability of the bearing;

[0018] 2. The air entering the air inlet pipe can pass through the outer wall of the air outlet pipe and perform heat exchange, so that the air entering the air inlet pipe can be preheated first and then heated by the heating device, achieving the effect of heat recovery of the exhaust gas and reducing heat waste;

[0019] 3. The heat exchange section of the air outlet pipe is provided with fins and spiral blades, and keeps rotating during the air exchange process, which can increase the heat exchange area, extend the heat exchange path of the heat exchange airflow, and make the heat exchange section uniform, thereby effectively improving the heat exchange effect;

[0020] 4. When the air from the intake pipe passes through the heat exchange section, it will be intercepted by the fins. After intercepting the air, the fins will be pushed. When multiple fins are pushed in sequence, the heat exchange section will eventually be driven to rotate automatically, so that the heat exchange section can rotate automatically with the air supply of the air suspension bearing, reducing the setting of the driving parts and improving the synchronization.

[0021] 5. The heating device maintains the temperature inside the air suspension bearing between 20℃-40℃. Within this temperature range, the air viscosity is moderate and a stable air film can be formed to support the efficient operation of the rotor of the bearing. Most bearing materials such as metal alloys or ceramics perform well within this temperature range and will not cause dimensional changes or performance degradation due to thermal expansion and contraction. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic plan view of a blower driven by an air floating shaft in an embodiment of the present application;

[0023] Figure 2 Schematic diagram of the air inlet and outlet pipes in the embodiment of the present application;

[0024] Figure 3 It is a structural schematic diagram of the heat exchange section of the air outlet pipe in the embodiment of the present application.

[0025] Explanation of the reference numerals: 1. Shell; 11. Bearing air inlet; 12. Bearing air outlet; 21. Motor; 22. Insulation layer; 3. Inlet pipe; 31. Heating section; 4. Outlet pipe; 41. Heat exchange section; 42. Fin; 43. Spiral blade; 5. Filter; 6. Heating device. DETAILED DESCRIPTION

[0026] The following will be combined Figure 1-Figure 3 The present invention is further illustrated by the following embodiments.

[0027] This embodiment discloses a blower driven by an air-floating shaft.

[0028] Reference Figure 1 and Figure 2The blower driven by an air floating shaft includes a blower body, the blower body includes a shell 1 and a motor 21, the motor 21 is externally arranged on the shell 1, an air suspension bearing is arranged inside the blower body, the shell of the blower body is provided with a bearing air inlet 11 and a bearing air outlet 12, the air suspension bearing is connected to an air supply system through the bearing air inlet 11 and the bearing air outlet 12, the air supply system includes an air inlet pipe 3 and an air outlet pipe 4, both of which pass through the shell of the blower body, the air of the air suspension bearing enters through the air inlet pipe 3 and is discharged through the air outlet pipe 4, thereby forming an air film on the air suspension bearing, it should be noted that the air supply system of the air suspension bearing is provided with an air pump, the air pump is connected to the air inlet pipe 3, and the air pump provides driving force for the gas flowing in the air suspension bearing. Furthermore, a filter screen 5 is provided in the air intake pipe 3, and the filter screen 5 is used for dust and particulate matter in the air. A heating device 6 is also provided on the outer wall of the air intake pipe 3, and the heating device 6 is used to heat the gas in the air intake pipe 3, thereby heating the gas entering the air suspension bearing. In this embodiment, the heating device 6 is a prior art, so it is not described in detail. Based on the above improvements, on the one hand, the filter screen 5 can filter the air entering the air suspension bearing, avoiding the negative impact of increased friction and wear caused by polluted air on the bearing, thereby extending the life of the bearing. On the other hand, the heating device 6 can heat the air entering the air suspension bearing, avoiding the negative impact of increased gas viscosity and decreased air film stiffness caused by low-temperature air on the bearing, thereby improving the stability of the bearing. In this embodiment, the heating device 6 keeps the temperature in the air suspension bearing between 20°C and 40°C. Within this temperature range, the air viscosity is moderate, and a stable air film can be formed to support the efficient operation of the rotor of the bearing, and most bearing materials such as metal alloys or ceramics perform well within this temperature range, and will not cause dimensional changes or performance degradation due to thermal expansion and contraction. Correspondingly, a temperature sensor and a controller need to be arranged between the blower body and the heating device 6. The temperature sensor is arranged between the intake pipe 3 and the air suspension bearing at the rear end of the heating device 6 to monitor the intake air temperature after heating. The controller is externally arranged on the outer shell of the blower body. The temperature sensor, the controller and the heating device 6 are connected by signals. The controller adjusts the heating power of the heating device 6 according to the monitoring signal of the temperature sensor to ensure that the intake air temperature is in the range of 20°C to 40°C. In addition, in the present invention, since the air suspension bearing and the motor 21 are respectively arranged inside and outside the outer shell, the influence of the heated gas on the motor 21 can be reduced, and the heated gas can be prevented from causing the motor 21 to overheat easily. In order to further reduce this influence, a heat insulation layer 22 is provided between the motor 21 and the outer shell. In this embodiment, the heat insulation layer 22 is a rubber layer. In addition to having good heat insulation, the rubber layer also has good elasticity and can buffer the vibration generated during the operation of the motor 21.

[0029] Reference Figure 1 and Figure 2 Considering that if the heated gas is discharged directly through the outlet pipe 4, it will cause a large amount of heat waste, the present invention has made further optimization. Specifically, the outlet pipe 4 penetrates the inlet pipe 3 to form an intersection, and the inlet pipe 3 is widened at the position where the outlet pipe 4 passes (i.e., the intersection), so that the air entering the inlet pipe 3 can pass through the outer wall of the outlet pipe 4 and perform heat exchange, so that the air entering the inlet pipe 3 can be preheated before being heated by the heating device 6, so as to achieve the effect of heat recovery of the exhaust gas and reduce heat waste.

[0030] Reference Figure 1 and Figure 2 The air inlet pipe 3 is a combined pipe, and the air inlet pipe 3 is divided into a heating section 31 and a non-heating section. The heating device 6 is arranged in the heating section 31. The heating section 31 of the air inlet pipe 3 and the air outlet pipe 4 are made of copper tubes or other pipes with good thermal conductivity. The inner wall of the copper tube is smooth, the gas flow resistance is small, and it is convenient for gas conduction. At the same time, the copper tube has high thermal conductivity and excellent thermal conductivity. After the heating section 31 of the air inlet pipe 3 is made of copper tube, it can be efficiently heated, and after the air outlet pipe 4 is made of copper tube, it can be efficiently heat exchanged; the non-heating section of the air inlet pipe 3 is made of plastic tubes, fiberglass tubes or other pipes with poor thermal conductivity. The plastic tubes or fiberglass tubes also have smooth inner walls, small gas flow resistance, and are convenient for gas conduction, but the plastic tubes or fiberglass tubes have low thermal conductivity and excellent thermal insulation performance, which is convenient for gas insulation in the air inlet pipe 3 and reduces heat loss during the air intake process.

[0031] Reference Figures 1 to 3 In order to improve the heat exchange effect, the present invention also makes the following improvements. Specifically, the outlet pipe 4 is also a combined pipe, and the outlet pipe 4 is divided into a heat exchange section 41 and a non-heat exchange section. The heat exchange section 41 of the outlet pipe 4 is located in the inlet pipe 3. The outer wall of the heat exchange section 41 is provided with fins 42. The heat of the gas in the heat exchange section 41 is dissipated outward through the fins 42, increasing the heat exchange area and improving the heat exchange effect. In addition, the inner wall of the heat exchange section 41 is provided with spiral blades 43, so that the exhaust gas forms a rotating airflow when passing through the heat exchange section 41, prolonging the flow time of the exhaust gas in the heat exchange section 41, thereby prolonging the heat exchange time and improving the heat exchange effect. In addition, the outlet pipe 4 is a circular tube, and the heat exchange section 41 is rotatably arranged between the two non-heat exchange sections. The heat exchange section 41 keeps rotating during the heat exchange process. Through rotation, the heat exchange section 41 can make its surroundings evenly face the gas entering the inlet pipe 3, so as to evenly exchange heat and fully recover residual heat. In this embodiment, the heat exchange section 41 is in the same direction as the rotation mode of the airflow inside it. Ball bearings are also provided between the end surfaces of the heat exchange section 41 and the non-heat exchange section, and the ball bearings are used to reduce the rotational friction between the heat exchange section 41 and the non-heat exchange section.

[0032] Reference Figures 1 to 3There are multiple fins 42 on the outer wall of the heat exchange section 41, and the multiple fins 42 are evenly distributed around the axis of the heat exchange section 41. When the air of the intake pipe 3 passes through the heat exchange section 41, it will be intercepted by the fins 42. After intercepting the air, the fins 42 will be pushed. When the multiple fins 42 are pushed in sequence, the heat exchange section 41 will eventually be driven to rotate automatically, so that the heat exchange section 41 can rotate automatically with the air supply of the air suspension bearing, reducing the setting of the driving parts and improving the synchronization. Furthermore, the windward surface of the fin 42 is concave, so that the fin 42 can better hold the air, thereby easily driving the heat exchange section 41 to rotate.

[0033] The above are all preferred embodiments of the present invention, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A blower driven by an air-floating shaft, characterized in that: The invention comprises a blower body, wherein the blower body comprises a shell (1) and a motor (21), wherein the motor (21) is externally arranged on the shell (1), wherein an air suspension bearing is arranged inside the blower body, wherein the outer shell of the blower body is provided with a bearing air inlet (11) and a bearing air outlet (12), wherein the air suspension bearing is connected to an air supply system via the bearing air inlet (11) and the bearing air outlet (12), wherein the air supply system comprises an air inlet pipe (3) and an air outlet pipe (4), wherein a filter screen (5) is arranged inside the air inlet pipe (3), and a heating device (6) is arranged on the outer wall of the air inlet pipe (3).

2. A blower driven by an air-floating shaft according to claim 1, characterized in that: The air outlet pipe (4) penetrates the air inlet pipe (3) to form a junction.

3. A blower driven by an air-floating shaft according to claim 2, characterized in that: The air outlet pipe (4) is divided into a heat exchange section (41) and a non-heat exchange section. The heat exchange section (41) of the air outlet pipe (4) is located inside the air inlet pipe (3), and the outer wall of the heat exchange section (41) is provided with fins (42).

4. A blower driven by an air-floating shaft according to claim 3, characterized in that: The inner wall of the heat exchange section (41) is provided with spiral blades (43).

5. The blower driven by an air-floating shaft according to claim 4, characterized in that: The air outlet pipe (4) is a circular pipe, the heat exchange section (41) is rotatably arranged between the two non-heat exchange sections, and the heat exchange section (41) keeps rotating during the heat exchange process.

6. The blower driven by an air-floating shaft according to claim 5, characterized in that: A plurality of fins (42) are provided on the outer wall of the heat exchange section (41), and the plurality of fins (42) are evenly distributed around the axis of the heat exchange section (41).

7. The blower driven by an air-floating shaft according to claim 6, characterized in that: The windward surface of the fin (42) is concave inwardly.

8. The blower driven by an air-floating shaft according to claim 2, characterized in that: The air inlet pipe (3) is divided into a heating section (31) and a non-heating section. The heating device (6) is arranged in the heating section (31) of the air inlet pipe (3). The heating section (31) of the air inlet pipe (3) and the air outlet pipe (4) are made of copper pipes, and the non-heating section of the air inlet pipe (3) is made of plastic pipe or glass fiber reinforced plastic pipe.

9. The blower driven by an air-floating shaft according to claim 1, characterized in that: The heating device (6) controls the intake air temperature to be in the range of 20°C to 40°C.

10. The blower driven by an air-floating shaft according to claim 1, characterized in that: A heat insulation layer (22) is provided between the motor (21) and the housing, and the heat insulation layer (22) is a rubber layer.

Images