An intelligent online dust cleaning device for centrifugal fan impeller blades

Abstract

The present invention discloses an intelligent online dust cleaning device for a centrifugal fan impeller channel. The centrifugal fan includes a fan inlet duct and a fan impeller. The dust cleaning device is arranged on the wall surface of the fan inlet duct close to the fan inlet. The dust cleaning device includes a nozzle, a pressurized gas inlet pipe, and an intelligent control system. The nozzle is aligned with the impeller channel inlet. The other end of the nozzle is connected to a mixer and the pressurized gas inlet pipe. The pressurized gas inlet pipe runs through the wall surface of the fan inlet duct and is connected to an electric control valve. The electric control valve is electrically connected to the intelligent control system. The intelligent control system controls the opening and closing of the electric control valve and also controls the upward and downward movement of a slider of a slide rail assembly. The nozzle and mixer are fixed to a connecting member, which is connected to a slider on the slide rail assembly. Driven by the slider, the nozzle can move freely in the axial direction of the fan impeller. The device of the present invention can remove different types of dust and scale layers on the inner wall surface of the impeller channel without stopping the machine.

Description

Technical Field

[0001] The present invention belongs to the technical field of fans, and in particular relates to an intelligent online dust cleaning device for an impeller channel of a centrifugal fan. Background Art

[0002] Centrifugal fans are widely used in environmental dust removal, pharmaceuticals, petroleum, chemical, and grain processing industries for the mixed transport of gas and solids during the production of micro- and nano-sized solid particles. In these industries, dust often accumulates on the four walls of the impeller passages of centrifugal fans conveying dust-laden gases. The dust layer can be over 20mm thick. In severe cases, it can completely block the passages, rendering the centrifugal fans inoperable. This necessitates production interruptions and the disassembly of the fans to remove the dust layer. This not only disrupts production and causes financial losses for the company, but also seriously harms the health of maintenance workers during the disassembly and removal process, as the dust layer is released. Under extreme operating conditions, the dust layer can also cause crevice corrosion in the impellers, leading to dynamic imbalance and serious accidents caused by corrosion of the impeller blades, impeller shrouds, and impeller discs. At one refinery, six centrifugal fans were damaged by dust buildup in the impeller passages, causing impeller rupture and fan throw-off, resulting in the complete destruction of the fans and motors, resulting in significant losses. How to avoid the recurrence of such phenomenon and whether the dust and dirt layer can be removed intelligently online without stopping the machine when the dust adhering to the impeller blade channel is not serious? The present invention is to solve such problems. Summary of the Invention

[0003] To overcome the above-mentioned shortcomings of the prior art, the present invention provides an intelligent online dust cleaning device for the impeller channel of a centrifugal fan, which can remove different types of dust and scale deposits on the inner wall of the impeller channel without stopping the machine. To achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0004] The fan is then blown away by the impeller, and the impeller is then blown away by the impeller, and the impeller is then blown away by the impeller. The impeller is then blown away by the impeller, and the impeller is then blown away by the impeller. A connecting piece, the connecting piece passes through the wall of the fan air inlet duct through the rectangular opening and is connected to the slider located on the outer wall of the fan air inlet duct, and the nozzle can move up and down according to a set distance in the axial direction of the fan impeller under the drive of the slider through the connecting piece and the pressure gas inlet pipe; a sealing cover is provided on the outer wall of the fan air inlet duct, the slide rail assembly and the rectangular opening are sealed in the sealing cover, the pressure gas inlet pipe passes through the sealing cover and is fixedly sealed and connected to the wall of the sealing cover and then extends to the outside, an electric control valve is provided on the extended section of the pressure gas inlet pipe, the electric control valve is electrically connected to the intelligent control system, and the intelligent control system controls the opening and closing of the electric control valve.

[0005] In the above technical solution, a mixer is provided between the nozzle and the pressurized gas inlet pipe, the connecting piece is fixedly mounted on the mixer, a flexible connecting pipe is fixedly connected to the side wall of the mixer, the flexible connecting pipe passes through the wall of the fan air inlet duct through the rectangular opening and then passes through the wall of the sealing cover and is fixedly sealed and connected with the wall of the sealing cover and then extends to the outside, and the other end of the flexible connecting pipe is connected to a storage tank.

[0006] In the above technical solution, the rectangular opening is opened at a position corresponding to the sliding rail of the sliding rail assembly, the sliding rail of the sliding rail assembly is fixedly arranged on the outer wall surface of the fan air inlet duct, the length direction of the rectangular opening is parallel to the axis of the fan air inlet duct, and the width direction is the circumferential direction of the fan air inlet duct. The rectangular opening enables the connecting part and the components arranged thereon to move freely at a set distance in the axial direction of the impeller.

[0007] In the above technical solution, two identical dust cleaning devices are symmetrically mounted on the fan impeller with the impeller axis as the central axis.

[0008] In the above technical solution, it is determined whether normal temperature and high pressure gas or high temperature and high pressure steam is introduced into the pressure gas inlet pipe according to the properties of the dust structure layer; if the blade path of the fan impeller is dry dust accumulation, normal temperature and high pressure gas is introduced; if the blade path of the fan impeller is a sticky dust accumulation layer, high temperature and high pressure steam is introduced.

[0009] In the above technical solution, the storage tank is filled with chemical solvents or solid particles; if the dust structure layer in the fan impeller blade path is an insoluble adhesive or a solid layer, the corresponding solvent or corresponding solid particles are loaded into the storage tank to blow away the dust structure layer.

[0010] In the above technical solution, the intelligent control system is provided with an intelligent module which intelligently analyzes and determines whether the purge system should be opened for online cleaning according to the flow rate changes and vibration amplitude changes in the fan air inlet duct. A timing control program is also provided to automatically perform timed online cleaning of the impeller path of the fan impeller. A manual control program can also be designed to perform irregular dust cleaning by manually controlling button operations based on the inspection situation of the inspection personnel.

[0011] In the above technical solution, the dust cleaning device can also be used in an axial flow fan or on a rotating component that comes into contact with dust-laden gas to remove the dust and scaling layer generated. The beneficial effects of the present invention are:

[0012] 1. Intelligently remove various types of dust deposits in the impeller passage without stopping the machine;

[0013] 2. Avoid economic losses caused by downtime;

[0014] 3. Save maintenance costs for shutdown and maintenance;

[0015] 4. For industries that produce dusty materials such as chemicals and pharmaceuticals, it avoids material waste during disassembly and maintenance;

[0016] 5. Avoid the pollution of dust to the environment during the disassembly and removal process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structural principle of the device of the present invention;

[0018] Among them: 1-motor, 2-fan impeller, 3-fan volute, 4-nozzle, 5-sealing cover, 6-slide rail assembly, 7-mixer, 8-connector, 9-storage tank, 10-flexible connecting pipe, 11-pressurized gas inlet pipe, 12-fan air inlet duct. 13-electric control valve. DETAILED DESCRIPTION

[0019] To better illustrate the purpose, technical solutions, and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments. The present invention can be implemented in many different forms and should not be construed as limited to the embodiments set forth herein. Instead, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concept of the present invention to those skilled in the art. The present invention will be limited only by the claims.

[0020] like Figure 1 As shown, the present invention provides an intelligent online dust cleaning device for a centrifugal fan impeller channel, comprising a nozzle 4, a mixer 7, a storage tank 9, an electric control valve 13, a pressurized gas inlet pipe 11, a slide rail assembly 6, a connector 8, a flexible connecting pipe 10, a sealing cover 5, and a fan impeller 2. The nozzle 4 of the dust cleaning device is installed at the inlet of the fan impeller 2 channel and is fixedly connected to the mixer 7 above. The upper portion of the mixer 7 is connected to a pressurized gas inlet pipe 11. The pressurized gas inlet pipe 11 passes through a rectangular opening in the wall of the fan inlet duct 12 and through the wall of the sealing cover 5, where it is fixedly and sealedly connected to the sealing cover 5. The pressurized gas inlet pipe 11 is fixedly connected to an external electric control valve 13 outside the sealing cover 5. The electric control valve 13 is electrically connected to an intelligent control system, which controls the opening and closing of the electric control valve 13 and also controls the up and down movement of the slider of the slide rail assembly 6 within a set distance. The nozzle 4 and mixer 7 are fixedly connected to the slider of the slide rail assembly 6 as a whole via a connector 8. The mixer 7 and the storage tank 9 are fixedly connected via a flexible connecting pipe 10 .

[0021] The specific structure of one embodiment of the slide rail assembly 6 is as follows: the slide rail assembly 6 includes a slide rail, a slider that slides on the slide rail, and a power mechanism. The slide rail is fixedly mounted on the outer wall of the fan air inlet duct 12, and the slider is movably mounted on the slide rail. The slider is driven by the power mechanism to slide on the slide rail. The slider is also connected to a connector 8, and the nozzle 4 and mixer 7 are fixedly mounted on the other end of the connector 8. The power mechanism of the slide rail assembly 6 is electrically connected to an intelligent control system, which controls the power mechanism to achieve linear back-and-forth motion of the slider on the slide rail.

[0022] The device of the present invention is mounted on the wall of the fan inlet duct 12, immediately adjacent to the fan inlet, with the nozzle 4 aligned directly with the impeller blade entrance. The slide rail assembly 6 is fixedly mounted on the outer wall of the fan inlet duct 12. A through-hole, rectangular opening is defined at a corresponding location on the wall of the fan inlet duct 12. The length of the opening is parallel to the axis of the fan inlet duct 12, and the width is circumferential. The rectangular opening penetrates the fan inlet duct 12 and allows the connector 8, flexible connecting tube 10, and pressurized gas inlet tube 11 to pass smoothly through, allowing these three components to move freely along the impeller axis.

[0023] The nozzle 4 and mixer 7 are located within the fan inlet duct 12, while the electric control valve 13 and storage tank 9 are located outside the sealing cover. The entire slide rail assembly 6 and the rectangular opening formed in the wall of the fan inlet duct 12 are tightly sealed within the sealing cover 5, preventing gas from leaking out of the fan inlet duct 12.

[0024] Under the control of the intelligent system, the slider on the lower rail assembly 6 drives the nozzle 4 and the mixer 7 to move back and forth along the axis of the impeller at the same time through the connecting piece 8. The pressurized gas inlet pipe 11 and the flexible connecting pipe 10 also follow the movement. The nozzle 4 directly sprays pressurized gas at the inlet of the impeller blade channel, so that the dust accumulated on the inner wall of the impeller blade channel is blown off by the impact of the pressurized gas, thereby achieving the purpose of online cleaning.

[0025] Because the nozzle 4 only makes a linear motion along the axis of the impeller at the impeller inlet, and the impeller rotates around its own axis, each blade channel of the impeller can be blown into place by the high-pressure gas ejected by the nozzle 4. One nozzle is enough to clean the dust accumulated in the impeller blade channel. But from the working principle of the centrifugal impeller, when high-pressure gas rushes into a blade channel of the impeller, the flow field in the blade channel will be chaotic, causing a large reverse vortex, causing the impeller to generate an asymmetric force perpendicular to its axis direction. The asymmetric force is a non-periodic changing force that can cause the fan to vibrate and affect the normal operation of the fan. Therefore, as a preferred solution, two completely identical impeller blade channel intelligent online dust cleaning devices are symmetrically installed with the impeller axis as the central axis to balance the unbalanced force generated by the large reverse vortex.

[0026] Dry dust deposits in the impeller passage can be cleaned with pressurized gas from nozzle 4. However, pressurized gas alone cannot completely remove sticky dust deposits. To remove sticky dust deposits in the impeller passage, a pressurized gas of a different nature, such as steam, must be used. Certain dust layers can only be removed with heated steam.

[0027] For some special dust and scale layers, pressurized gas and steam cannot be used to remove them completely. For such dust and scale layers, solvents can be added to the pressurized gas, or solid particles with larger particle sizes, such as quartz sand or small iron balls, can be added to the pressurized gas. If solvents or quartz sand are added, a mixer 7 must be used. The basic principle of the mixer 7 is to use the suction force of the throat to draw the solvent or solid particles from the storage tank 9 into the mixer 7. After the pressurized gas is mixed with the solvent or solid particles in the mixer 7, the mixture is sprayed into the impeller channel through the nozzle 4. At this time, the dust in the impeller channel will be cleaned by the sprayed solvent or the sprayed solid particles with larger particle sizes.

[0028] The intelligent control system includes a smart module that intelligently analyzes changes in flow rate and vibration amplitude within the fan inlet duct 12 to determine whether to activate the purge system for online cleaning. It also includes a timed control program that automatically and regularly removes dust and scale deposits from the impeller passage. Naturally, a manual control program can also be designed to perform irregular cleaning based on the inspection results of patrol personnel, using manual control buttons.

[0029] The device of the present invention can be used not only in centrifugal fans, but also in axial fans, or to remove dust and scale layers generated on rotating components that come into contact with dust-laden gases. The only difference is the location of the dust and scale layer and the installation method of the intelligent online dust cleaning device for the impeller channel.

[0030] The device of the present invention can directly remove dust and scale deposits from the inner wall of the impeller channel without stopping the machine. This does not affect production, requires no manual disassembly, and does not waste micro-nano product dust. Because the basic operating principle of the intelligent online dust cleaning device for the impeller channel is to utilize the kinetic energy of pressurized gas, the kinetic energy of solid particles, the chemical energy of the solvent, and the kinetic energy and thermal energy of steam, it can remove various dust and scale deposits within the impeller channel. Of course, when selecting these gases, solid particles, and chemical solvents, the pollution to the dust products produced must be considered.

[0031] The specific working principle of the device of the present invention is as follows: After the intelligent control system obtains the vibration signal and the flow signal, the intelligent system analyzes and concludes that the dust accumulation in the impeller blade channel has reached a certain thickness, and then issues a command to open the electric control valve 13, and at the same time, the slider of the slide rail assembly 6 begins to move up and down along the axis of the impeller 2. The up and down movement of the slider drives the nozzle 4 through the connecting member 8 to make a linear motion in the axial direction within the maximum value range of the axial direction at the inlet of the impeller blade channel. During the up and down movement of the nozzle 4, the pressurized gas ejected from the nozzle 4 is directly blown into the impeller blade channel. Since the impeller is rotating, the pressurized gas ejected from the nozzle 4 can be blown to each wall surface in the impeller blade channel. The dust accumulated on the inner surface of the impeller blade channel is swept away by the pressurized gas.

[0032] When the scale in the impeller channel is relatively hard, different types of solid particles with a particle size of tens or thousands of microns, such as quartz sand or small steel balls, can be added to the storage tank 9. These solid particles are sucked into the mixer 7 through the flexible connecting pipe 10 under the suction action of the throat of the mixer 7. After the solid particles are mixed with the pressurized gas in the mixer 7, they are sprayed into the channel of the impeller 2 through the connecting pipe of the nozzle 4 through the nozzle 4. During the vertical linear motion of the nozzle 4 parallel to the axis of the impeller 2 and the rotational motion of the impeller 2, all wall surfaces in the impeller channel may be impacted by the solid particles and the pressurized gas, and the dust structure layer is removed under the action of the impact force.

[0033] When the dust scaling layer in the impeller channel is a cohesive substance, chemical solvents can be added to the storage tank 9. These solvents are sucked into the mixer 7 through the flexible connecting pipe 10 under the suction action of the throat of the mixer 7. The chemical solvents are mixed with the pressurized gas in the mixer 7 and then sprayed into the channel of the impeller 2 through the nozzle 4. During the vertical linear motion of the nozzle 4 along the impeller axis and the rotational motion of the impeller 2, all wall surfaces in the impeller channel may be impacted by the chemical solvents and the pressurized gas. Under the combined action of the impact force and the chemical solvents, the dust structure layer is removed.

[0034] When the dust scaling layer in the impeller blade passage requires temperature to dissolve, the gas introduced into the pressurized gas inlet pipe 11 can be steam, and the dust scaling layer in the impeller blade passage is removed under the combined action of the dynamic impact of the steam and the temperature.

[0035] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. An intelligent online dust cleaning device for a centrifugal fan impeller channel, the centrifugal fan comprising a fan air inlet duct (12) and a fan impeller (2), characterized in that: The dust cleaning device is arranged on the wall of the fan air inlet duct (12) close to the fan inlet, and the dust cleaning device includes a nozzle (4), a pressure gas inlet pipe (11) and an intelligent control system. The nozzle (4) is aligned with the blade path inlet of the fan impeller (2), and the other end of the nozzle (4) is connected to the pressure gas inlet pipe (11). A through rectangular opening is opened on the wall of the fan air inlet duct (12), and the pressure gas inlet pipe (11) passes through the rectangular opening and extends to the outside through the wall of the fan air inlet duct (12); The outer wall of the fan air inlet duct (12) is provided with a slide rail assembly (6), and the slide rail assembly (6) includes a slide rail and a slider. A connector (8) is fixedly installed at the connection between the pressure gas inlet pipe (11) and the nozzle (4). The connector (8) passes through the wall of the fan air inlet duct (12) through the rectangular opening and is connected to the slider located on the outer wall of the fan air inlet duct (12). The nozzle (4) can move up and down according to a set distance in the axial direction of the fan impeller (2) under the drive of the slider through the connector (8) and the pressure gas inlet pipe (11); The outer wall of the fan air inlet duct (12) is provided with a sealing cover (5), the slide rail assembly (6) and the rectangular opening are sealed in the sealing cover (5), the pressure gas inlet pipe (11) passes through the sealing cover (5) and is fixedly and sealedly connected to the wall of the sealing cover (5) and then extends to the outside, the extended section of the pressure gas inlet pipe (11) is provided with an electric control valve (13) for connection, the electric control valve (13) is electrically connected to an intelligent control system, and the intelligent control system controls the opening and closing of the electric control valve (13); A mixer (7) is provided between the nozzle (4) and the pressure gas inlet pipe (11), the connector (8) is fixedly mounted on the mixer (7), and a flexible connecting pipe (10) is fixedly connected to the side wall of the mixer (7). The flexible connecting pipe (10) passes through the rectangular opening and penetrates the wall of the fan air inlet duct (12), then penetrates the wall of the sealing cover (5), and is fixedly sealed and connected to the wall of the sealing cover (5) before extending to the outside. The other end of the flexible connecting pipe (10) is connected to a storage tank (9); The storage tank (9) is filled with a chemical dissolving agent or solid particles; if the dust structure layer in the blade path of the fan impeller (2) is an insoluble adhesive or a solid layer, the storage tank (9) is filled with a corresponding dissolving agent or corresponding solid particles to blow away and remove the dust structure layer.

2. The intelligent online dust cleaning device for the impeller channel of a centrifugal fan according to claim 1, characterized in that: The rectangular opening is opened at a position corresponding to the slide rail of the slide rail assembly (6), and the slide rail of the slide rail assembly (6) is fixedly arranged on the outer wall surface of the fan air inlet duct (12). The length direction of the rectangular opening is parallel to the axis of the fan air inlet duct (12), and the width direction is the circumferential direction of the fan air inlet duct (12). The rectangular opening enables the connecting member (8) and the components arranged thereon to move freely at a set distance in the axial direction of the fan impeller (2).

3. The intelligent online dust cleaning device for the impeller channel of a centrifugal fan according to claim 1, characterized in that: Two identical dust cleaning devices are symmetrically mounted on the fan impeller (2) with the impeller axis as the central axis.

4. The intelligent online dust cleaning device for the impeller channel of a centrifugal fan according to claim 1, characterized in that: According to the properties of the dust structure layer, it is determined whether normal temperature high pressure gas or high temperature high pressure steam is introduced into the pressure gas inlet pipe (11); if the blade passage of the fan impeller (2) is dry dust accumulation, normal temperature high pressure gas is introduced; if the blade passage of the fan impeller (2) is a sticky dust accumulation layer, high temperature high pressure steam is introduced.

5. The intelligent online dust cleaning device for the impeller channel of a centrifugal fan according to claim 1, characterized in that: The intelligent control system is provided with an intelligent module for intelligently analyzing and judging whether the purge system should be opened for online cleaning according to the flow rate change and the vibration amplitude change in the fan air inlet duct (12). A timing control program is also provided for automatically and regularly cleaning the blade path of the fan impeller (2). A manual control program can also be designed to perform irregular dust cleaning by manually controlling the button operation according to the inspection situation of the inspection personnel.

6. The intelligent online dust cleaning device for the impeller channel of a centrifugal fan according to claim 1, characterized in that: The dust cleaning device can also be used to remove dust and scaling layers generated in axial flow fans.

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