Dust removal fan for dust-containing and saturated water vapor-containing dust removal system

Abstract

The utility model relates to the field of dust removal fans, and discloses a dust removal fan for a dust removal system containing dust and saturated water vapor. The fan comprises a fan body and an impeller, the impeller is rotationally installed in the fan body and suitable for acting on airflow media, the impeller comprises a shell, a flow guide ring arranged in the shell and a single-layer blade, the peripheral wall of the flow guide ring is bent and inclined in the direction of an air outlet of the impeller in the shell, and the single-layer blade is obliquely installed on the peripheral wall of the flow guide ring. The multiple single-layer blades are arranged on the peripheral wall of the flow guide ring at intervals. Water is prevented from entering the blades, so that the problem of dynamic balance damage caused by entering of water vapor is effectively prevented, the fan operates stably, and the service life of the fan is prolonged; airflow turbulence and energy loss are reduced, and the efficiency of the fan is improved; the unique combined shaft seal is adopted, and the sealing performance between the main shaft and the machine shell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of dust removal fans, in particular to a dust removal fan used in a dust-containing and saturated water vapor dust removal system. Background Art

[0002] Existing impellers in dust removal fans often use hollow airfoil-shaped blades. These blades are prone to welding defects, resulting in tiny gaps at the weld defects. However, in dust removal systems containing dust, saturated water vapor, and alkaline environments, the fan's operating environment is extremely harsh. Saturated water vapor in the medium can easily enter the airfoil-shaped blades through the tiny gaps at the weld defects, disrupting the blade's dynamic balance, affecting the fan's stable operation, and ultimately reducing its service life and operating efficiency. Utility Model Content

[0003] In order to solve at least one aspect of the above problems, the utility model provides a dust removal fan for a dust-containing and saturated water vapor dust removal system, comprising a fan body and an impeller. The impeller is rotatably installed in the fan body and is suitable for doing work on the air flow medium. The impeller comprises an outer shell, a guide ring arranged in the outer shell, and a single-layer blade. The outer peripheral wall of the guide ring is bent and tilted in the direction of the impeller outlet in the outer shell. The single-layer blade is obliquely installed on the outer peripheral wall of the guide ring. There are multiple single-layer blades, and the multiple single-layer blades are arranged at intervals on the outer peripheral wall of the guide ring.

[0004] Optionally, a docking groove is provided on the outer peripheral wall of the guide ring, and one side of the single-layer blade is inserted into the docking groove, and the other side protrudes from the docking groove.

[0005] Optionally, the thickness of the single-layer blade is greater than the wall thickness of the aerofoil-shaped blade.

[0006] Optionally, an air intake guide cylinder is provided in the fan body, the air intake guide cylinder is located at the air inlet of the impeller, and the air intake guide cylinder is plug-connected to the impeller.

[0007] Optionally, the fan body includes a casing, a motor and a transmission group, the impeller is arranged in the casing, the transmission group is provided with a main shaft, the main shaft is inserted into the casing near one end of the casing and connected to the impeller, and the motor is connected to the transmission group to drive the main shaft to drive the impeller to rotate.

[0008] Optionally, a combined shaft seal assembly is provided at the connection between the main shaft and the casing, and the combined shaft seal assembly includes a sealing box connected to the outside of the casing, and the main shaft passes through the sealing box, and the sealing box is provided with multiple different sealing structures.

[0009] Optionally, a mounting ring groove is provided on the side of the sealing box body facing away from the casing, and a sealing packing is provided in the mounting ring groove or on the main shaft. The sealing packing is sleeved on the main shaft and fits tightly with the main shaft. The outer peripheral wall of the sealing packing fits tightly with the groove wall of the mounting ring groove. The sealing packing is a flexible graphite packing or a polytetrafluoroethylene packing. At least two sealing packings are provided, and the plurality of sealing packings are arranged at intervals along the axial direction of the main shaft.

[0010] Optionally, an oil filling ring is fixed in the mounting ring groove, the oil filling ring is located between two adjacent sealing packings, the inner circumferential wall of the oil filling ring is provided with a circle of liquid storage ring groove, the outer wall of the sealing box body is provided with an oil filling hole, the oil filling hole is connected to the liquid storage ring groove, and the oil filling hole is interference-inserted with a rubber plug.

[0011] Optionally, a PTFE gasket is provided in the mounting ring groove or on the main shaft, the PTFE gasket is sleeved on the main shaft and fits tightly with the main shaft, the outer peripheral wall of the PTFE gasket fits tightly with the wall of the mounting ring groove, multiple PTFE gaskets are provided, and the multiple PTFE gaskets are arranged at intervals along the axial direction of the main shaft, and a metal gasket is provided between two adjacent PTFE gaskets.

[0012] Optionally, a sealing cover plate is provided at the notch of the mounting ring groove, one end of the sealing cover plate is inserted into the mounting ring groove and is suitable for squeezing the sealing packing and the PTFE gasket, the sealing cover plate is connected to the side of the sealing box body away from the casing by bolts, and a compression adjustment gap is provided between the sealing cover plate and the sealing box body.

[0013] Compared with the prior art, the beneficial technical effects of the present invention are:

[0014] 1. Replacing the hollow airfoil blades with single-layer blades can not only ensure the strength of the impeller and meet the fan's high air volume operation requirements, but also effectively prevent water from entering the blades, thereby preventing the dynamic balance problem caused by water vapor intrusion, making the fan run stably and extending the fan's service life;

[0015] 2. The thickness of the single-layer blade is greater than that of the hollow airfoil-shaped blade, which makes the single-layer blade more wear-resistant and less likely to wear through, reducing the risk of balance being disrupted due to blade wear, and further improving the overall performance and service life of the fan;

[0016] 3. The inclined setting of the guide ring also makes the single-layer blades have a certain inclination angle. At the same time, it cooperates with the air inlet guide tube to make the medium flow more smoothly when entering the fan, reducing air flow turbulence and energy loss, thereby improving the efficiency of the fan;

[0017] 4. A unique combined shaft seal is used between the main shaft and the casing. Through liquid seals, multiple sealing packings and multiple PTFE gaskets, a labyrinth-type sealing structure is formed, which can gradually reduce the leakage of air flow media. The outermost sealing cover is tightened with bolts. The compression of the sealing cover on the sealing packing and PTFE gasket can be adjusted at any time according to needs. The deformation size of the sealing packing and PTFE gasket is thereby adjusted to achieve the adjustment of the sealing condition. In addition, this combined shaft seal has a low manufacturing cost and can achieve good sealing performance under harsh working conditions, solving the sealing problem of traditional sealing methods in dusty and saturated water vapor alkaline environments.

[0018] 5. Grease can be injected into the liquid storage groove of the oil filling ring to play a dual role of lubrication and sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the overall structural diagram of the fan in the embodiment of the present utility model;

[0020] Figure 2 This is a cross-sectional view of an impeller in an embodiment of the present utility model;

[0021] Figure 3 This is a partial structural diagram of the impeller in the embodiment of the present utility model;

[0022] Figure 4 This is a cross-sectional view of a combined shaft seal assembly in an embodiment of the present utility model;

[0023] Figure 5 for Figure 1 Enlarged view of part A in the middle.

[0024] Explanation of the accompanying symbols: 1. Fan body; 11. Casing; 12. Motor; 13. Transmission group; 14. Air inlet guide tube; 2. Impeller; 21. Outer casing; 211. Impeller front disk; 212. Impeller rear disk; 213. Inner arc-shaped convex ring; 22. Guide ring; 23. Single-layer blades; 3. Combined shaft seal assembly; 31. Sealing box; 311. Mounting ring groove; 312. Oil filling hole; 313. Rubber plug; 32. Sealing packing; 33. Oil filling ring; 331. Liquid storage ring groove; 34. PTFE gasket; 35. Metal gasket; 36. Sealing cover plate. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0026] In the description of the present invention, it should be understood that the terms "upper" and "lower" and the like indicate positions or location relationships based on the positions or location relationships during normal use of the product.

[0027] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0028] The following is combined with Figure 1-5 This application is described in further detail.

[0029] The utility model provides a dust removal fan for a dust removal system containing dust and saturated water vapor, Figure 1 and Figure 2 The dust removal fan used in the dust and saturated water vapor dust removal system includes a fan body 1 and an impeller 2. The impeller 2 is rotatably mounted within the fan body 1 and is suitable for performing work on the airflow medium. The impeller 2 includes a housing 21, a guide ring 22 disposed within the housing 21, and single-layer blades 23. The single-layer blades 23 are mounted on the outer peripheral wall of the guide ring 22. A plurality of single-layer blades 23 are provided, and the plurality of single-layer blades 23 are arranged at intervals on the outer peripheral wall of the guide ring 22. Replacing the original hollow airfoil-shaped blades with single-layer blades 23 effectively prevents water from entering the blades, thereby preventing the dynamic balance problem caused by water vapor ingress, ensuring stable operation of the fan, and extending the service life of the fan.

[0030] The fan body 1 includes a housing 11, a motor 12, and a transmission unit 13. The impeller 2 is rotatably mounted within the housing 11. The housing 11 is provided with an air inlet and an air outlet. Airflow enters the housing 11 through the air inlet, passes through the impeller 2, and then exits through the air outlet. The transmission unit 13 is located between the housing 11 and the motor 12. The transmission unit 13 includes a main shaft. The end of the main shaft closest to the housing 11 is inserted into the housing 11 and connected to the impeller 2 to drive the impeller 2 to rotate. The main shaft is rotatably connected to the housing 11, and the motor 12 is connected to the transmission unit 13 to drive the main shaft to drive the impeller 2 to rotate.

[0031] Reference Figure 1 and Figure 2 The housing 21 includes an impeller front disc 211 and an impeller rear disc 212. The impeller front disc 211 is located on the side near the air inlet of the casing 11. The impeller rear disc 212 is bolted with a shaft end disc. The main shaft is connected to the shaft end disc to drive the impeller 2 to rotate. The guide ring 22 and multiple single-layer blades 23 are located between the impeller front disc 211 and the impeller rear disc 212. The ends of the single-layer blades 23 near the impeller front disc 211 and the impeller rear disc 212 protrude from the guide ring 22 in a cantilevered state. The ends of the single-layer blades 23 abut the impeller front disc 211 and the impeller rear disc 212 respectively. The impeller front disc 211 and the impeller rear disc 212 are both welded to the single-layer blades 23. The inner ring of the impeller front disk 211 is bent to form an arcuate convex ring, and the bending extension direction of the arcuate convex ring is away from the impeller rear disk 212, thereby facilitating the guidance of the air flow medium so that the air flow medium can stably enter the interior of the housing 21.

[0032] Reference Figure 2 and Figure 3 The guide ring 22 is arranged within the outer casing 21, gradually bending and tilting along the radial direction from its inner ring to the outer ring toward the impeller rear disc 212, ensuring smoother flow of the airflow medium after entering the impeller 2. The outer peripheral wall of the guide ring 22 is provided with a docking groove, which extends along the circumference of the guide ring 22 to form an arc-shaped inclined groove. One side of the single-layer blade 23 is inserted into the docking groove and then welded to the guide ring 22; the other side protrudes from the docking groove, thereby ensuring the single-layer blade 23 can be positioned and installed with the guide ring 22. Furthermore, after being inserted into the docking groove, the single-layer blade 23 also forms an inclined arc-shaped blade. The number of docking grooves matches the number of single-layer blades 23 and corresponds one-to-one.

[0033] The thickness of the single-layer blade 23 is greater than the wall thickness of the hollow airfoil-shaped blade, so that the single-layer blade 23 has better wear resistance and is not easily worn through, reducing the risk of balance being destroyed due to blade wear, and further improving the overall performance and service life of the fan.

[0034] Reference Figure 1 and Figure 2 An air intake guide tube 14 is fixedly mounted within the housing 11 and communicates with the air inlet of the housing 11. After entering the housing 11 from the air inlet, the airflow is guided and stably moved by the air intake guide tube 14. The end of the air intake guide tube 14, which is closest to the impeller front disc 211, is inserted into the arc-shaped convex ring 213, thereby ensuring smoother flow of the airflow upon entering the fan, reducing airflow turbulence and energy loss, thereby improving fan efficiency.

[0035] Reference Figure 1 and Figure 4 In order to enable the fan to operate in an extremely harsh environment containing dust and saturated water vapor and to prevent the air flow medium in the fan from leaking, a combined shaft seal assembly 3 is provided at the connection between the main shaft and the casing 11. The combined shaft seal assembly 3 includes a sealing box body 31 welded to the outside of the casing 11, and the main shaft passes through the sealing box body 31. The sealing box body 31 is provided with multiple different sealing structures.

[0036] Combine Figure 1 Reference Figure 4 and Figure 5 Specifically, a mounting groove 311 is defined on the side of the sealing box 31 facing away from the housing 11. The end of the main shaft, which is closest to the housing 11, is inserted into the mounting groove 311 and passes through the sealing box 31 to be located within the housing 11. A flexible sealing packing 32 is wrapped around the main shaft, tightly fitting the main shaft. The outer circumferential wall of the sealing packing 32 closely fits the circumferential wall of the mounting groove 311. In another embodiment, the sealing packing 32 can be disposed within the mounting groove 311.

[0037] In this embodiment, two sealing packings 32 are preferably provided at intervals along the axial direction of the main shaft, thereby forming a two-way sealing structure to improve the sealing effect. In another embodiment, three, four, or more sealing packings 32 can be provided at intervals, as long as all the sealing packings 32 are located in the mounting ring groove 311.

[0038] The sealing packing 32 may be a flexible graphite packing; or a flexible PTFE packing. In this embodiment, the sealing packing 32 is preferably PTFE packing, which is more wear-resistant and has a longer service life.

[0039] Reference Figure 4 and Figure 5 An oil filling ring 33 is provided between the two sealing packings 32. The oil filling ring 33 is integrally formed with the sealing box 31. The inner circumferential wall of the oil filling ring 33 does not contact the main shaft, reducing the friction on the main shaft. A circle of liquid storage ring grooves 331 is provided on the inner circumferential wall of the oil filling ring 33. An oil filling hole 312 is provided on the outer wall of the sealing box 31. The oil filling hole 312 is connected to the liquid storage ring groove 331. A rubber plug 313 is inserted into the oil filling hole 312 for interference fit. When in use, the rubber plug 313 can be removed and butter, lubricating oil, water or other media can be injected into the liquid storage ring groove 331 through the oil filling hole 312. The liquid is not easily leaked due to the sealing of the sealing packings 32 on both sides and the outer circumferential wall of the main shaft, thereby achieving a liquid sealing effect, further improving the sealing effect of the connection between the main shaft and the casing 11. If butter or lubricating oil is injected into the liquid storage ring groove 331, it will play a dual role of lubrication and sealing.

[0040] A polyfluoroethylene gasket 34 is also sleeved around the main shaft, located on the side of the sealing packing 32 away from the housing 11. The polyfluoroethylene gasket 34 fits tightly against the main shaft, and its outer circumferential wall abuts against the circumferential wall of the mounting ring groove 311, providing a sealing effect. In another embodiment, a sealing groove can be formed around the wall of the mounting ring groove 311, and the polyfluoroethylene gasket 34 can be installed in the sealing groove.

[0041] Reference Figure 4 and Figure 5 In this embodiment, three PTFE gaskets 34 are preferably provided. The three PTFE gaskets 34 are adjacently arranged along the axial direction of the main shaft, and one of the PTFE gaskets 34 abuts against the sealing packing 32. Furthermore, a metal gasket 35 is provided between two adjacent PTFE gaskets 34. The inner diameter of the metal gasket 35 is larger than the outer diameter of the main shaft and does not contact the main shaft to form friction.

[0042] A sealing cover plate 36 is installed at the notch of the mounting ring groove 311. The cross-section of the sealing cover plate 36 is an "L" rotated 90 degrees counterclockwise. One end of the sealing cover plate 36 is inserted into the mounting groove and is suitable for squeezing the sealing packing 32 and the PTFE gasket 34. The other end is located outside the sealing ring groove and is connected to the sealing box 31 via bolts. The sealing cover plate 36 is located outside the sealing box 31 and close to the sealing box 31. There is a pressure adjustment gap between the sealing cover plate 36 and the sealing box 31. When adjusting the sealing effect according to actual conditions, the sealing cover plate 36 is tightened by turning the bolts to adjust the degree of squeezing of the sealing packing 32 and the PTFE gasket 34, thereby adjusting the deformation of the sealing packing 32 and the PTFE gasket 34 to achieve the desired sealing effect.

[0043] The implementation principle of the dust removal fan for a dust-containing and saturated water vapor dust removal system in the embodiment of the present application is as follows: the hollow aerofoil-shaped blades are replaced with single-layer blades 23, which can not only ensure the strength of the impeller 2 and meet the operation requirements of the fan with large air volume, but also effectively avoid water entering the blades, thereby preventing the dynamic balance problem caused by the entry of water vapor, making the fan run stably, and improving the service life of the fan. The inclined setting of the guide ring 22 also makes the single-layer blades 23 have a certain inclination angle, and at the same time cooperates with the air inlet guide tube 14 to make the medium flow more smoothly when entering the fan, reducing the turbulence of the air flow and energy loss, thereby improving the efficiency of the fan.

[0044] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will fall within the protection scope of the present utility model.

Claims

1. A dust removal fan for a dust removal system containing dust and saturated water vapor, characterized by: The invention comprises a fan body (1) and an impeller (2), wherein the impeller (2) is rotatably mounted in the fan body (1) and is suitable for performing work on an air flow medium, wherein the impeller (2) comprises a housing (21), a guide ring (22) arranged in the housing (21), and single-layer blades (23), wherein the outer peripheral wall of the guide ring (22) is bent and tilted in the direction of the air outlet of the impeller (2) in the housing (21), and the single-layer blades (23) are tilted and mounted on the outer peripheral wall of the guide ring (22), and a plurality of the single-layer blades (23) are provided, and the plurality of the single-layer blades (23) are arranged at intervals on the outer peripheral wall of the guide ring (22).

2. The dust removal fan for a dust removal system containing dust and saturated water vapor according to claim 1, characterized in that: The outer peripheral wall of the guide ring (22) is provided with a docking groove, one side of the single-layer blade (23) is inserted into the docking groove, and the other side protrudes from the docking groove.

3. The dust removal fan for a dust removal system containing dust and saturated water vapor according to claim 1, characterized in that: The thickness of the single-layer blade (23) is greater than the wall thickness of the airfoil-shaped blade.

4. The dust removal fan for a dust removal system containing dust and saturated water vapor according to claim 1, characterized in that: An air intake guide tube (14) is provided in the fan body (1), the air intake guide tube (14) is located at the air inlet of the impeller (2), and the air intake guide tube (14) is plug-connected to the impeller (2).

5. A dust removal fan for a dust removal system containing dust and saturated water vapor according to any one of claims 1 to 4, characterized in that: The fan body (1) comprises a casing (11), a motor (12) and a transmission group (13); the impeller (2) is arranged in the casing (11); the transmission group (13) is provided with a main shaft; one end of the main shaft close to the casing (11) is inserted into the casing (11) and connected to the impeller (2); the motor (12) is connected to the transmission group (13) to drive the main shaft to drive the impeller (2) to rotate.

6. The dust removal fan for a dust removal system containing dust and saturated water vapor according to claim 5, characterized in that: A combined shaft seal assembly (3) is provided at the connection between the main shaft and the housing (11). The combined shaft seal assembly (3) includes a sealing box (31) connected to the outside of the housing (11). The main shaft passes through the sealing box (31). The sealing box (31) is provided with multiple different sealing structures.

7. The dust removal fan for a dust removal system containing dust and saturated water vapor according to claim 6, characterized in that: The sealing box (31) is provided with a mounting ring groove (311) on the side facing away from the housing (11), and a sealing packing (32) is provided in the mounting ring groove (311) or on the main shaft. The sealing packing (32) is sleeved on the main shaft and fits tightly with the main shaft. The outer peripheral wall of the sealing packing (32) fits tightly with the groove wall of the mounting ring groove (311). The sealing packing (32) is a flexible graphite packing or a polytetrafluoroethylene packing. At least two sealing packings (32) are provided, and a plurality of the sealing packings (32) are arranged at intervals along the axial direction of the main shaft.

8. The dust removal fan for a dust removal system containing dust and saturated water vapor according to claim 7, characterized in that: An oil filling ring (33) is fixedly provided in the mounting ring groove (311), and the oil filling ring (33) is located between two adjacent sealing packings (32). The inner peripheral wall of the oil filling ring (33) is provided with a circle of liquid storage ring groove (331). The outer wall of the sealing box (31) is provided with an oil filling hole (312), and the oil filling hole (312) is connected to the liquid storage ring groove (331). The oil filling hole (312) is interference-inserted with a rubber plug (313).

9. The dust removal fan for a dust removal system containing dust and saturated water vapor according to claim 7, characterized in that: A polyfluorocarbon gasket (34) is provided in the mounting ring groove (311) or on the main shaft. The polyfluorocarbon gasket (34) is sleeved on the main shaft and fits tightly with the main shaft. The outer peripheral wall of the polyfluorocarbon gasket (34) fits tightly with the groove wall of the mounting ring groove (311). A plurality of polyfluorocarbon gaskets (34) are provided. The plurality of polyfluorocarbon gaskets (34) are spaced apart and arranged along the axial direction of the main shaft. A metal gasket (35) is provided between two adjacent polyfluorocarbon gaskets (34).

10. The dust removal fan for a dust removal system containing dust and saturated water vapor according to claim 9, characterized in that: A sealing cover plate (36) is provided at the notch of the mounting ring groove (311). One end of the sealing cover plate (36) is inserted into the mounting ring groove (311) and is suitable for squeezing the sealing packing (32) and the PTFE gasket (34). The sealing cover plate (36) is connected to the side of the sealing box (31) away from the housing (11) by bolts. A gap for adjusting the degree of compression is provided between the sealing cover plate (36) and the sealing box (31).

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