Air suspension centrifugal fan

Abstract

The invention discloses an air suspension centrifugal fan, and relates to the technical field of centrifugal fans, the air suspension centrifugal fan comprises an external box body internally provided with a motor, the external box body is internally provided with an arc-shaped mounting outer cover connected with the motor, the arc-shaped mounting outer cover is internally provided with an impeller assembly, the output end of the motor is connected with a driving rod of the impeller assembly through an air bearing, and the output end of the motor is connected with the driving rod of the impeller assembly. The relative position of the water outlet groove and the cleaning flow channel is changed by rotating the adjusting ring, multiple cleaning modes are achieved, the included angle, the outer pressure face and the inner suction face of the blade can be flushed through adjustment of multiple states, the water outlet angle is adjusted and controlled through shielding, the water outlet pressure is increased, meanwhile, local positioning cleaning can be conducted on the blade, and the cleaning efficiency is improved. The problem that local parts are difficult to clean is solved, it is ensured that the roots, the middles and the tips of the blades can achieve the optimal washing angle, and efficient liquid cleaning of the impeller is achieved on the premise that absolute safety of the air bearing is ensured through multiple sealing protection design.

Description

Technical Field

[0001] The present invention relates to the technical field of centrifugal fans, and particularly to an air suspension centrifugal fan. Background Art

[0002] As an efficient and energy-saving fluid machine, the air suspension centrifugal fan is widely used in fields with extremely high cleanliness requirements such as semiconductor manufacturing, precision electronics, and pharmaceutical production due to its contactless and frictionless operating characteristics.

[0003] However, during actual operation, pollutants such as dust and oil mist will accumulate on the surface of the impeller and need to be cleaned. Most of the existing technologies use pneumatic backwashing technology to blow gas against the blades for cleaning, but it can only clean the dust on its surface, and the oil mist on its surface cannot be cleaned. The long-term accumulation of oil mist will stick to the dust, making the oil mist and dust mix into viscous pollutants, seriously affecting the aerodynamic performance and operating efficiency of the equipment. Summary of the Invention

[0004] The purpose of the present invention is to provide an air suspension centrifugal fan, which realizes directional cleaning by directly connecting an external water supply system to an adjustment ring. When the equipment stops, the external water source supplies water into the adjustment ring through the water supply system, and the water flows out through the matching opening of the water outlet groove inside the adjustment ring and the cleaning channel. By rotating the adjustment ring, the relative position of the water outlet groove and the cleaning channel is changed to realize various cleaning modes. Through the adjustment of various states, it is possible to flush both the blade angle and the outer pressure surface and the inner suction surface, and use shielding to control the water outlet angle, increase the water outlet pressure while being able to perform local positioning cleaning on the blades, effectively clean the dust and oil mist, prevent the long-term accumulation of oil mist, ensure the best flushing angle for the root, middle, and tip of the blades, and realize the efficient liquid cleaning of the impeller on the premise of ensuring the absolute safety of the air bearing through a multi-layer sealing and protection design.

[0005] To achieve the above object, the present invention provides the following technical solution: An air suspension centrifugal fan includes an external box body with a motor installed inside, an arc-shaped installation outer cover connected to the motor is arranged inside the external box body, an impeller assembly is arranged inside the arc-shaped installation outer cover, and the output end of the motor is connected to the driving rod of the impeller assembly through an air bearing;

[0006] The impeller assembly includes a central ring and blades arranged in a circular array on the surface of the central ring. A radially extending cleaning channel is provided at the connecting root of the blade and the central ring. A strip-shaped water outlet communicating with the outside is opened on one side of the cleaning channel. An adjustable ring capable of rotating is arranged inside the cleaning channel. Water outlet grooves are opened on the adjustable ring. The rotation of the adjustable ring is used to adjust the water outlet angle of the cleaning channel, and the inlet end of the adjustable ring is connected to the external water supply system;

[0007] The first working state: When the adjusting ring rotates until the water outlet groove coincides with the cleaning flow path opening and the inner wall near the central ring blocks % of the flow area, the water flow is directed to spray onto the outer pressure surface of the adjacent blade;

[0008] The second working state: When the adjusting ring rotates until the water outlet groove coincides with the cleaning flow path opening and the inner wall far from the central ring blocks % of the flow area, the water flow is directed to spray onto the inner suction surface of the current blade.

[0009] Furthermore, one end of the central ring is connected to a closing plate, and an external water supply system is provided on the driving rod between the closing plate and the air bearing.

[0010] Furthermore, the external water supply system includes a water receiving ring arranged inside the arc-shaped installation outer cover. A center groove for the driving rod to pass through is formed in the middle of the water receiving ring, and annular sealing air bags are symmetrically arranged on the inner wall of the center groove.

[0011] Furthermore, two annular sealing seats are symmetrically sleeved on the rod body of the driving rod located in the center groove, and a circle of semi-circular grooves corresponding to the annular sealing air bags are formed on the outer walls of the two sealing seats.

[0012] Furthermore, a number of water through grooves are annularly formed in the closing plate, and the water through grooves communicate with the adjusting ring.

[0013] Furthermore, a driving member for driving the adjusting ring to rotate is provided on the closing plate.

[0014] Furthermore, the driving member includes a gear ring, a linkage gear, and a driver. The driver drives the gear ring to rotate through a gear, and a number of linkage gears are respectively sleeved on one end of the adjusting ring, and the linkage gears are all meshed with the gear ring.

[0015] Furthermore, the blade is of a bent angle type, and the cleaning flow path correspondingly is of a bent angle shape.

[0016] Furthermore, two adjusting rings are arranged in the cleaning flow path, and the butt ends of the two adjusting rings are connected by a telescopic member.

[0017] Furthermore, built-in rods are arranged in both of the two adjusting rings, and the two built-in rods are in transmission connection, and one of the built-in rods is meshed with the gear ring.

[0018] The technical effects and advantages of the present invention:

[0019] 1. The present invention realizes directional cleaning by directly connecting an external water supply system to an adjustment ring. When the equipment stops operating, the external water source supplies water into the adjustment ring through the water supply system. The water flows out through the cooperation opening between the water outlet grooves inside the adjustment ring and the cleaning channels. By rotating the adjustment ring, the relative positions of the water outlet grooves and the cleaning channels are changed to achieve various cleaning modes. Through the adjustment of various states, it is possible to flush both the blade angle and the outer pressure surface and the inner suction surface. Moreover, by using occlusion to regulate the water outlet angle, while increasing the water outlet pressure, local positioning cleaning of the blades can be carried out, solving the problem of difficult cleaning in local areas. Through precise rotation control of the adjustment ring, stepless adjustment of the water outlet angle within the range of 0 - 90 degrees can be achieved. A 50% occlusion design is adopted to form a Venturi effect, increasing the water pressure by more than 40%, ensuring the best flushing angles for the blade roots, middle parts, and tips. Through 45° oblique water outlet, scale deposits that are difficult to handle by traditional methods can be effectively removed.

[0020] 2. The present invention provides an external water supply system. During cleaning, first, air is injected into the annular sealing airbag to make it expand and tightly press against the wall of the semi-circular groove, forming a sealed space between the two sealing seats. An inlet groove is provided on the driving rod within this space, and at this time, the sealed space is connected to the through-water groove through the inlet groove to achieve sealed water inlet. While ensuring that the air bearing does not get water, liquid cleaning of the impeller is realized. The sealed water supply design not only ensures zero-contact protection of the air bearing but also realizes efficient and in-depth cleaning of the impeller. Moreover, when the annular sealing airbag is deflated and retracted, it does not contact the sealing seat, achieving zero contact and avoiding friction on it when the driving rod rotates. After retraction, the gap between the annular sealing airbag and the sealing seat is used for gas circulation, enabling gas to flow at both ends of the air bearing and avoiding air bearing failure caused by air flow blockage.

[0021] 3. When the blades are of the bent-angle type, the present invention needs to set two adjustment rings, and the docking part of the two adjustment rings is connected by a telescopic member. When the two adjustment rings rotate, the telescopic member can adapt to the change of the connection angle. The built-in adjustment ring is connected to the inner wall of the adjustment ring through a support plate and does not block the liquid flow. The two built-in rods are driven by bevel gears. After one of the built-in rods is docked with the driving member, the two adjustment rings can be driven to rotate synchronously through transmission, and the through-water groove docked with the adjustment ring changes appropriately according to the set position of the adjustment ring, effectively realizing the cleaning of bent-angle blades and solving the problem of difficult cleaning of the bent angles of bent-angle blades. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is the overall structural schematic diagram of the present invention;

[0023] Figure 2 is the internal structural sectional view of the external box body of the present invention;

[0024] Figure 3Schematic diagram of the arc-shaped installation outer cover structure of the present invention;

[0025] Figure 4 Schematic diagram of the impeller assembly structure of the present invention;

[0026] Figure 5 Sectional view of the cleaning channel and the split structure of the adjustment ring of the present invention;

[0027] Figure 6 Half-sectional view of the closed plate structure of the present invention;

[0028] Figure 7 For the present invention Figure 6 Enlarged view of part A;

[0029] Figure 8 Half-sectional view of the external water supply system structure of the present invention;

[0030] Figure 9 For the present invention Figure 8 Enlarged view of part B;

[0031] Figure 10 Plan sectional view of the structure of the curved blade of the present invention;

[0032] Figure 11 For the present invention Figure 10 Enlarged view of part C.

[0033] In the figure:

[0034] 1. External box body; 11. Arc-shaped installation outer cover; 2. Impeller assembly; 21. Central ring; 211. Closed plate; 2111. Water channel; 22. Blade; 221. Cleaning channel; 23. Adjustment ring; 231. Water outlet groove; 232. Telescopic member; 233. Built-in rod; 3. External water supply system; 31. Water receiving ring; 32. Center groove; 33. Annular sealing airbag; 34. Sealing seat; 341. Half-ring groove; 4. Driving member; 41. Gear ring; 42. Linkage gear; 43. Driver. Detailed implementation manners

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] To better understand an air suspension centrifugal fan provided in this embodiment, a brief introduction to the existing air suspension centrifugal fan will be given first. Due to the special use of air bearings in the air suspension centrifugal fan, water cannot be used for cleaning inside the centrifugal fan cavity. When contaminants such as oil stains appear on the blades 22 and need to be cleaned, the centrifugal fan needs to be disassembled manually, and the impeller needs to be taken out for separate cleaning, resulting in a rather cumbersome process. The specification aims to solve the above technical problems. The embodiment of the present application provides an air suspension centrifugal fan, which realizes a three-dimensional cleaning effect without dead angles in all directions of the blades 22 without disassembling the impeller through a multi-state adjustment mechanism. The external water supply system 3 realizes efficient liquid cleaning of the impeller on the premise of ensuring the absolute safety of the air bearing through a multi-layer seal protection design.

[0037] Embodiment 1: Refer to Figure 1 - Figure 9 , which is the first embodiment of the present invention, provides an air suspension centrifugal fan, including an external box body 1 with a motor installed inside. An arc-shaped installation outer cover 11 connected to the motor is arranged inside the external box body 1. An impeller assembly 2 is arranged inside the arc-shaped installation outer cover 11. The output end of the motor is connected to the drive rod of the impeller assembly 2 through an air bearing;

[0038] The impeller assembly 2 includes a central ring 21 and blades 22 arranged in a circular array on the surface of the central ring 21. A radially extending cleaning channel 221 is provided at the connecting root of the blade 22 and the central ring 21. A strip-shaped water outlet communicating with the outside is arranged on one side of the cleaning channel 221. An adjustable ring 23 capable of rotating is arranged inside the cleaning channel 221. A water outlet groove 231 is arranged on the adjustable ring 23. The rotation of the adjustable ring 23 is used to adjust the water outlet angle of the cleaning channel 221, and the inlet end of the adjustable ring 23 is connected to the external water supply system 3. This solution is based on the impeller self-cleaning system in the shutdown state, and realizes directional cleaning through the direct connection between the external water supply system 3 and the adjustable ring 23. When the equipment is shut down, external water source supplies water into the adjustable ring 23 through the external water supply system 3. The water flows out through the cooperation opening of the water outlet groove 231 inside the adjustable ring 23 and the cleaning channel 221. By rotating the adjustable ring 23 to change the relative position between the water outlet groove 231 and the cleaning channel 221, various cleaning modes are realized, effectively cleaning dust and oil mist and preventing the long-term accumulation of oil mist;

[0039] The first working state: When the adjustable ring 23 rotates until the water outlet groove 231 coincides with the opening of the cleaning channel 221 and 50% of the flow area is blocked by the inner wall close to the central ring 21, the water flow is directed to spray onto the outer pressure surface of the adjacent blade 22;

[0040] Second working state: When the adjusting ring 23 rotates until the water outlet groove 231 coincides with the opening of the cleaning flow path 221 and 50% of the flow area is blocked by the inner wall away from the central ring 21, the water flow is directed to the inner suction surface of the current blade 22.

[0041] Three working states are also provided. When the adjusting ring 23 rotates until the water outlet groove 231 completely coincides with the opening of the cleaning flow path 221, the water outlet groove 231 is not blocked. At this time, the water outlet groove 231 increases, and the entire impeller assembly 2 is flushed.

[0042] Through the adjustment of multiple states, it is possible to flush both the angle between the blades 22 and the outer pressure surface and the inner suction surface, and use the blockage to control the water outlet angle. While increasing the water outlet pressure, local positioning cleaning of the blades 22 can be achieved, solving the problem of difficult cleaning in some areas. Through the precise rotation control of the adjusting ring 23, stepless adjustment of the water outlet angle within the range of 0 - 90 degrees can be realized. The 50% blockage design forms a Venturi effect, increasing the water pressure by more than 40%. This ensures the best flushing angle for the blade roots, middle parts, and tips. Through the 45° oblique water outlet, scale that is difficult to handle by traditional methods can be effectively removed.

[0043] One end of the central ring 21 is connected to the closing plate 211. A water supply system 3 is arranged on the driving rod between the closing plate 211 and the air bearing. The external water supply system 3 includes a water receiving ring 31 arranged inside the arc-shaped mounting outer cover 11. A central groove 32 for the driving rod to pass through is formed in the middle of the water receiving ring 31. Annular sealing air bags 33 are symmetrically arranged on the inner wall of the central groove 32. Two annular sealing seats 34 are symmetrically sleeved on the rod body of the driving rod located in the central groove 32. A circle of semi-circular grooves 341 corresponding to the annular sealing air bags 33 are formed on the outer walls of the two sealing seats 34. It should be noted that an air bearing is a sliding bearing that uses gas as a lubricant. If water enters the air bearing, it will cause metal rust and corrosion, damage the lubricating oil film on the surface of the bearing raceway, lead to poor lubrication, and cause damage to the air bearing. In order to avoid damage to the air bearing and better clean the impeller, this solution provides an external water supply system 3. During cleaning, first inject gas into the annular sealing air bag 33 to make it expand and tightly press against the wall of the semi-circular groove 341, so as to form a sealed space between the two sealing seats 34. An inlet groove is formed on the driving rod in this space. At this time, the sealed space is communicated with the water through groove 2111 through the inlet groove to achieve sealed water inlet. While ensuring that the air bearing does not admit water, liquid cleaning of the impeller is realized. The sealed water supply design not only ensures zero-contact protection of the air bearing but also realizes efficient and deep cleaning of the impeller. And when the annular sealing air bag 33 is evacuated and retracted, it does not contact the sealing seat 34, achieving zero contact and avoiding friction on it when the driving rod rotates. The gap between the retracted annular sealing air bag 33 and the sealing seat 34 is used for gas circulation, enabling gas to flow at both ends of the air bearing and avoiding air bearing failure caused by air flow blockage.

[0044] A number of water through grooves 2111 are annularly formed in the closing plate 211. The water through grooves 2111 communicate with the adjusting ring 23. One end of the inlet groove formed on the driving rod communicates with the inside of the water through groove 2111 to realize water flow transmission.

[0045] A driving member 4 for driving the adjusting ring 23 to rotate is arranged on the closing plate 211. The driving member 4 includes a gear ring 41, a linkage gear 42, and a driver 43. The driver 43 drives the gear ring 41 to rotate through gears. A number of linkage gears 42 are respectively sleeved on one end of the adjusting ring 23, and the linkage gears 42 are all meshed with the gear ring 41. The driving member 4 is used to drive multiple adjusting rings 23 to synchronously adjust the angle, so as to perform multi-angle adjustment.

[0046] Specifically, the gear ring 41 rotates under the drive of the driver 43. The rotation of the gear ring 41 drives the linkage gear 42 and the adjusting ring 23 to rotate, and then drives the adjusting ring 23 to adjust the water outlet angle.

[0047] Embodiment 2: Refer to Figure 10 - Figure 11, which is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that the blade 22 is of a bent angle type, and the cleaning channel 221 correspondingly is of a bent angle shape. Two adjusting rings 23 are arranged in the cleaning channel 221, and the docking ends of the two adjusting rings 23 are connected by a telescopic member 232. Built-in rods 233 are arranged in both of the two adjusting rings 23, and the two built-in rods 233 are in transmission connection. One of the built-in rods 233 meshes with the gear ring 41. When the blade 22 is of a bent angle type, two adjusting rings 23 need to be set, and the docking part of the two adjusting rings 23 is connected by a telescopic member 232. When the two adjusting rings 23 rotate, the telescopic member 232 can adapt to the change of the connection included angle. The built-in adjusting ring 23 is connected to the inner wall of the adjusting ring 23 through a support plate and does not block the liquid flow. The two built-in rods 233 are driven by bevel gears. After one of the built-in rods 233 is docked with the driving member 4, the two adjusting rings 23 can be driven to rotate synchronously by means of transmission, and the water through-channel 2111 docked with the adjusting ring 23 changes appropriately according to the set position of the adjusting ring 23, effectively realizing the cleaning of the bent angle blade 22 and solving the problem that the bent angle of the bent angle blade 22 is not easy to clean.

[0048] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An air suspension centrifugal fan, comprising an external box (1) with a motor installed inside, an arc-shaped mounting cover (11) connected to the motor is arranged inside the external box (1), characterized in that: An impeller assembly (2) is disposed in the arc-shaped mounting cover (11), and an output end of the motor is connected to a driving rod of the impeller assembly (2) via an air bearing; The impeller assembly (2) comprises a center ring (21) and blades (22) arranged in an annular array on the surface of the center ring (21); a cleaning channel (221) extending radially is provided at the connecting root of the blades (22) and the center ring (21); a strip-shaped water outlet communicating with the outside is provided on one side of the cleaning channel (221); a rotatable adjustment ring (23) is provided in the cleaning channel (221); a water outlet groove (231) is provided on the adjustment ring (23); the adjustment ring (23) is rotated to adjust the water outlet angle of the cleaning channel (221); and the inlet end of the adjustment ring (23) is connected to an external water supply system (3); In the first working state, when the adjusting ring (23) rotates until the water outlet groove (231) overlaps with the opening of the cleaning flow channel (221) and 50% of the flow area is blocked by the inner wall close to the center ring (21), the water flow is directed to the outer pressure surface of the adjacent blade (22); Second working state: when the adjustment ring (23) rotates until the water outlet groove (231) coincides with the opening of the cleaning flow channel (221) and 50% of the flow area is blocked by the inner wall away from the center ring (21), the water flow is directed to the internal suction surface of the current blade (22).

2. The air suspension centrifugal fan according to claim 1, characterized in that: One end of the central ring (21) is connected to a closing plate (211), and an external water supply system (3) is provided on a driving rod between the closing plate (211) and the air bearing.

3. The air suspension centrifugal fan according to claim 2, characterized in that: The external water supply system (3) comprises a water receiving ring (31) arranged inside the arc-shaped mounting cover (11), a central groove (32) for the driving rod to pass through is provided in the middle of the water receiving ring (31), and an annular sealing airbag (33) is symmetrically arranged on the inner wall of the central groove (32).

4. The air suspension centrifugal fan according to claim 3, characterized in that: The driving rod is located in the center groove (32) and has two annular sealing seats (34) symmetrically sleeved on the rod body. The outer walls of the two sealing seats (34) are each provided with a semi-circular groove (341) corresponding to the annular sealing airbag (33).

5. The air suspension centrifugal fan according to claim 4, characterized in that: A plurality of water passage grooves (2111) are provided in an annular shape inside the sealing plate (211), and the water passage grooves (2111) are communicated with the adjustment ring (23).

6. The air suspension centrifugal fan according to claim 5, characterized in that: The connecting and closing plate (211) is provided with a driving member (4) for driving the adjusting ring (23) to rotate.

7. The air suspension centrifugal fan according to claim 6, characterized in that: The driving member (4) comprises a gear ring (41), a linkage gear (42) and a driver (43). The driver (43) drives the gear ring (41) to rotate via gears. The linkage gear (42) is provided with a plurality of linkage gears which are respectively sleeved on one end of the adjustment ring (23), and the linkage gears (42) are all meshed with the gear ring (41).

8. The air suspension centrifugal fan according to claim 7, characterized in that: The blades (22) are of an angled type, and the cleaning flow channel (221) is correspondingly angled.

9. The air suspension centrifugal fan according to claim 8, characterized in that: Two adjustment rings (23) are arranged in the cleaning flow channel (221), and the butt ends of the two adjustment rings (23) are connected by a telescopic member (232).

10. The air suspension centrifugal fan according to claim 9, characterized in that: Both adjustment rings (23) are provided with built-in rods (233), and the two built-in rods (233) are transmission-connected with each other, and one of the built-in rods (233) is meshed with the gear ring (41).

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