Vehicle-mounted centrifugal fan with mud removing device and mud removing method

Abstract

The application provides a method for removing sludge from a vehicle-mounted centrifugal fan with a sludge removing device. The air inlet chamber is designed into two sections, an upper air inlet section and a lower cleaning section, by setting a partition. A filter wheel is arranged in the air inlet chamber before the impeller inlet. Water supply nozzles are arranged between the left and right side plates of the air inlet chamber and the outer edge of the filter wheel. A water pool, a spiral rotor sludge discharging mechanism and a drainage device are arranged in the lower part of the cleaning section. When the fan is running, the accumulated water in the water pool is drained, the sludge discharging mechanism is started, and the sludge deposited at the bottom of the water pool is discharged by the spiral blades on the rotating shaft. When the fan is running, the accumulated water in the water pool is drained. When sludge removal is needed, the nozzles are opened to flush the sludge on the filter wheel and the side wall of the air inlet chamber. When the water level in the water pool rises and the lower edge of the filter wheel is immersed in water, the main shaft of the fan rotates at a speed to clean the adhering objects on the filter screen.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of centrifugal fan, in particular to a vehicle-mounted centrifugal fan with mud removal device. BACKGROUND

[0002] The road and port yard cleaning sweeper is divided into three categories according to the working principle, namely, suction sweeping type, vacuum suction type and pure sweeping type. Among them, the suction sweeping type sweeper has a disc brush and a suction disc extending out of the vehicle body. The disc brush disturbs the garbage on the ground by rotating itself and transversely throws it in front of the suction disc, which uses air power to suck it into the garbage can. The disc brush of the pure sweeping type sweeper is located on both sides of the middle of the frame, which is mainly used to concentrate and transport the garbage in front of the rolling brush. The garbage is thrown to the conveying belt during the rolling process, and then falls into the garbage can in the middle. The vacuum suction type sweeper does not have a disc brush cleaning mechanism, but relies on a suction disc extending out of the vehicle body to collect garbage. The suction power of the suction disc is provided by the negative pressure of the centrifugal fan. The suction nozzle width of the suction disc is the cleaning width. Generally, it has better cleaning effect than the suction sweeping type and pure sweeping type sweepers.

[0003] The vacuum suction type sweeper adopts a deep cleaning system, which is divided into pure suction type and blowing suction type according to the different air flow movement ways. The pure suction type completely absorbs garbage through the negative pressure of the centrifugal fan inlet, while the blowing suction type realizes the cleaning operation by using negative pressure and air blowing pressure. At the same time, according to whether water is sprayed or not, it is divided into dry dust collection and wet dust collection. The dry dust collection is mainly used for the ground with large amount of dust, small particle size, difficult dust suppression and inconvenient water spraying. The wet dust collection is usually used for port and wharf yard. The spilled material on the ground is mainly large particle size bulk material, some of which have certain viscosity. Therefore, the sweeper is required to have certain ground adherent stripping capacity and strong suction capacity. Therefore, water is usually sprayed in front of the suction port to flush and loosen the adherent on the ground, so as to realize deep cleaning. The sludge in the fan is hardened, which may cause imbalance of the impeller and blockage and jamming of the rotor dynamic fit. Therefore, we improve it and propose a vehicle-mounted centrifugal fan with mud removal device. SUMMARY

[0004] The present application aims at the problems existing in the background art. In order to achieve the above-mentioned application purposes, the present application provides the following technical solutions.

[0005] A vehicle-mounted centrifugal fan with mud removal device comprises the following steps: S1, using a partition plate to design the air inlet chamber into an upper air inlet area and a lower cleaning area, and setting a filter wheel before the inlet of the impeller (the first stage impeller of a multi-stage fan) in the air inlet chamber, and setting water injection nozzles between the left and right side plates of the air inlet chamber and the outer edge of the filter wheel, respectively, and setting a water pool, a spiral rotor mud discharge mechanism and a drainage device at the lower part of the cleaning area, and draining the accumulated water in the water pool when the fan is running.

[0006] As a preferred technical scheme of the present application, S2, the nozzles are opened to flush the filter wheel and the sidewall of the air inlet chamber, when the water level in the pool exceeds the lower edge of the filter wheel, the main shaft of the fan is rotated at a speed of 100-200 r / min to clean the adhering objects on the filter screen; after the water is drained, the spiral rotor sludge discharge mechanism is started, and the sludge deposited at the bottom of the pool is discharged by the pushing of the spiral blades on the rotating shaft.

[0007] As a preferred technical scheme of the present application, S3, when the fan is running, the accumulated water in the pool is drained, and when the sludge needs to be removed, the nozzles are opened to flush the sludge on the filter wheel and the sidewall of the air inlet chamber, when the water level in the pool rises and the lower edge of the filter wheel is immersed in water, the main shaft of the fan is rotated at a speed of 100-200 r / min to clean the adhering objects on the filter screen.

[0008] As a preferred technical scheme of the present application, S4, when the sludge needs to be discharged, the water is drained, and the sludge discharge mechanism is started, and the sludge deposited at the bottom of the pool is discharged by the pushing of the spiral blades on the rotating shaft.

[0009] A vehicle-mounted centrifugal fan with a sludge removal device, characterized by comprising an air inlet chamber, a filter wheel, a fan main shaft, a primary impeller, a secondary impeller, a curved channel, a backflow device, a volute, a sludge removal device, and a front bearing, a front bearing seat, a bearing seat seal, a transparent cover, a transparent cover seal, a rear bearing, a rear bearing seat, a rear bearing seat seal, and a cover.

[0010] As a preferred technical scheme of the present application, the filter wheel is installed on the fan main shaft and arranged in the air inlet chamber before the inlet of the primary impeller, and rotates with the fan main shaft when running; the sludge removal device is arranged inside the fan air inlet chamber, below the filter wheel and at the bottom of the air inlet chamber.

[0011] As a preferred technical scheme of the present application, the sludge removal device comprises a spiral rotor with a rotating shaft, a conveying groove, a shaft seal seat, a shaft seal, a bearing and a bearing seat, a bearing seal, a cover and a transparent cover, a drain valve, and nozzles arranged in the left and right passages of the air inlet chamber.

[0012] As a preferred technical scheme of the present application, the spiral rotor is arranged inside the conveying groove, and the drain valve is installed on the drain pipe.

[0013] Compared with the prior art, the present application has the following advantages:

[0014] In the scheme of the present application:

[0015] 1. The present application provides a method for removing sludge from a vehicle-mounted centrifugal fan with a sludge removal device, wherein the air inlet chamber is divided into an upper air inlet zone and a lower cleaning zone by a partition, a filter wheel is arranged in the air inlet chamber before the impeller inlet, water injection nozzles are arranged between the left and right side plates of the air inlet chamber and the outer edge of the filter wheel, a water pool, a sludge removal mechanism with a helical rotor and a drainage device are arranged in the lower part of the cleaning zone, and the accumulated water in the water pool is drained when the fan is running. After the water is drained, the sludge removal mechanism with a helical rotor is started, and the sludge deposited at the bottom of the water pool can be discharged by the pushing of the helical blades on the rotating shaft.

[0016] 2. The present application provides a vehicle-mounted centrifugal fan with a sludge removal device, wherein the accumulated water in the water pool is drained when the fan is running. When sludge removal is needed, the nozzles are opened to flush the sludge on the filter wheel and the side wall of the air inlet chamber. When the water level in the water pool rises and the lower edge of the filter wheel is immersed in water, the main shaft of the fan is rotated at a speed of 100-200 r / min to clean the adhering objects on the filter screen. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The structure diagram provided by the present application is shown in the figure;

[0018] Figure 2 The structure diagram provided by the present application is shown in the figure;

[0019] Figure 3 The helical blade sludge removal device provided by the present application is shown in the figure;

[0020] Figure 4 The suction cascade speed triangle diagram provided by the present application is shown in the figure;

[0021] Figure 5 The backflush cascade speed triangle diagram provided by the present application is shown in the figure;

[0022] Figure 6 The backflow cascade speed triangle diagram provided by the present application is shown in the figure;

[0023] Figure 7 The "suction-backflush" section speed triangle diagram provided by the present application is shown in the figure;

[0024] Figure 8 The blade angle diagram provided by the present application is shown in the figure. DETAILED DESCRIPTION

[0025] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described in detail below with reference to the drawings. Obviously, the described embodiments are one specific embodiment of the present application, and are not limited to all embodiments.

[0026] Therefore, the following detailed description of the embodiments of the application is not intended to limit the scope of the application as claimed, but merely to represent some embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the application.

[0027] It should be noted that the embodiments in the application and the features and technical solutions in the embodiments can be combined with each other without conflict, and it should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0028] Embodiment 1: please refer to Figures 1-7 A method for removing mud from a vehicle-mounted centrifugal fan with a mud removal device, a filter wheel 2 is installed on a fan main shaft 3, arranged in an air inlet chamber 1 before the inlet of a primary impeller 10, and rotates with the main shaft 3 during operation. The mud removal device 9 is arranged in the fan air inlet chamber 1, below the filter wheel 2 and at the bottom of the air inlet chamber 1.

[0029] The primary impeller 10 and the secondary impeller 13 are installed on the main shaft 3, the inlet of the primary impeller 10 is connected with the outlet of the filter wheel 2. For a double-stage centrifugal fan, the outlet of the primary impeller 10 is connected with the inlet of the reflux bend 11, the inlet of the secondary impeller 13 is connected with the outlet of the reflux device 12, and the secondary impeller 13 is located inside the volute 18. The single-stage centrifugal fan only has the primary impeller 10, without the secondary impeller 13, the reflux bend 11 and the reflux device 12, and the primary impeller 10 is installed inside the volute 18.

[0030] The air inlet chamber is constructed with side plates 101, 105 and partitions 102, 103, 104 and the outer circumference of the filter wheel, and thus the air inlet chamber is divided into an upper air inlet area and a lower cleaning area. Points a1, a2, …, a5 are marked on the position line of the outer circumference (Da) of the filter wheel, and corresponding points b1, b2, …, b5 are marked on the position line of the inner circumference (Db) of the filter wheel according to the corresponding relationship of the cascade channels.

[0031] Investigating the flow of gas in the cascade, the suction cascade inlet a1-a2 is connected with the air inlet area of the upper part of the air inlet chamber, and the outlet b1-b2 is connected with the inner circumference space of the filter wheel; the backflush cascade inlet b3-b4 is connected with the inner circumference space of the filter wheel, and the outlet a3-a4 is connected with the cleaning area of the lower part of the air inlet chamber; the reflux cascade inlet a5-a1 is connected with the cleaning area, and the outlet b5-b1 is connected with the inner circumference space of the filter wheel.

[0032] When the fan is running, the filter wheel rotates with the main shaft, the gas from the intake area flows into the filter wheel circumferential space through the suction air cascade (a1-a2, b1-b2), part of which turns into axial flow and flows to the impeller inlet, and the other part enters the backflushing cascade (b3-b4, a3-a4), under the action of centrifugal force, forming a flow from the inner circumference to the outer circumference of the cascade, thereby backflushing the filter screen and making the dust and mud adhering to the screen fall off; the gas entering the cleaning area from a3-a4 flows back to the filter wheel circumferential space through the return flow cascade (a5-a1, b5-b1) after bypassing the partition plate 103.

[0033] Example 2: Please refer to Figures 1-4 A method for removing mud from a vehicle-mounted centrifugal fan with a mud removal device, comprising the following steps: S1, using a partition plate to divide the intake chamber into an upper intake area and a lower cleaning area, and setting a filter wheel before the inlet of the impeller (for a single-stage fan, it refers to the inlet of the first-stage impeller) in the intake chamber, and setting water supply nozzles between the left and right side plates of the intake chamber and the outer edge of the filter wheel, and setting a water tank, a spiral rotor mud removal mechanism and a drainage device in the lower part of the cleaning area, and draining the accumulated water in the water tank when the fan is running.

[0034] S2, opening the nozzles to flush the filter wheel and the side wall of the intake chamber, when the water level in the water tank is higher than the lower edge of the filter wheel, rotating the main shaft of the fan at a speed of 100-200 r / min to clean the adhering objects on the filter screen, after draining the water, starting the mud removal mechanism to push the sludge deposited at the bottom of the water tank out by the spiral blades on the rotating shaft.

[0035] S3, when the fan is running, drain the accumulated water in the water tank, when mud removal is needed, open the nozzles to flush the sludge on the filter wheel and the side wall of the intake chamber, when the water level in the water tank rises and the lower edge of the filter wheel is immersed in water, rotate the main shaft of the fan at a speed of 100-200 r / min to clean the adhering objects on the filter screen.

[0036] S4, when mud removal is needed, after draining the water, start the mud removal mechanism to push the sludge deposited at the bottom of the water tank out by the spiral blades on the rotating shaft.

[0037] Embodiment 3: A vehicle-mounted centrifugal fan with a mud removal device, comprising an air inlet chamber 1, a filter wheel 2, a fan main shaft 3, a primary impeller 10, a secondary impeller 13, a curved channel 11, a refluxer 12, a volute 18, a mud removal device 9, and a front bearing 4, a front bearing seat 5, a bearing seat seal 6, a transparent cover 7, a transparent cover seal 8, a rear bearing 14, a rear bearing seat 15, a rear bearing seat seal 16, and a cover 17. The filter wheel 2 is installed on the fan main shaft 3, arranged in the air inlet chamber 1 before the inlet of the primary impeller 10, and rotates with the fan main shaft 3 during operation; the mud removal device 9 is arranged inside the fan air inlet chamber 1, below the filter wheel 2 and at the bottom of the air inlet chamber 1. The mud removal device 9 comprises a helical rotor 909 with a rotating shaft, a conveying groove 910, a shaft seal seat 905, a shaft seal 906, a bearing 901 and a bearing seat 902, a bearing seal 903, a cover 904 and a transparent cover 911, a drain valve 907, a sewage pipeline 908, and nozzles 912 arranged in the left and right channels of the air inlet chamber. The helical rotor 909 is arranged inside the conveying groove 910, and the drain valve 907 is installed on the sewage pipeline 908.

[0038] Embodiment 4: Analysis of inlet and outlet velocity characteristics of suction cascade, backwash cascade and reflux cascade

[0039] (1) Assuming that the airflow enters the suction cascade along the radial direction, the calculation formulae of the inlet flow velocity C11, the radial flow velocity C11m and the circumferential flow velocity C11u are as follows:

[0040] C11m = Q / F1 / τ0 (m / s) (Formula 1)

[0041] In the formula, Q represents the inlet flow rate of the fan, m3 / s

[0042] F1 represents the through-flow area at the inlet of the suction cascade (before the filter screen), F1 = 0.5*θ1*Da*L, m2

[0043] θ1 represents the corresponding circumferential angle of the suction cascade, rad

[0044] τ0 represents the opening rate of the filter screen

[0045] C11u = 0 (Formula 2)

[0046] C11 = C11m (m / s) (Formula 3)

[0047] The calculation formula of the circumferential linear velocity of the cascade is as follows:

[0048] Ua = π*Da*n / 60 (m / s) (Formula 4)

[0049] In the formula, Da represents the outer circumferential diameter of the cascade, m

[0050] n represents the rotational speed, r / min

[0051] The formula for calculating the relative velocity at the inlet of the suction cascade is:

[0052] W11 = (Ua2+ C11 2)0.5(m / s) (Formula 5)

[0053] The formula for calculating the flow angle at the inlet of the suction cascade is:

[0054] β1 = arc tan(C11 / Ua) (rad) (Formula 6)

[0055] Given the inlet angle of attack i1, the blade inlet installation angle βa can be determined:

[0056] βa = β1 + i1 (rad) (Formula 7)

[0057] In the formula, i1 is the inlet angle of attack, rad

[0058] The formula for calculating the peripheral velocity in the cascade is:

[0059] Ub = π*Db*n / 60 (m / s) (Formula 8)

[0060] In the formula, Db is the diameter of the peripheral circle in the cascade, m

[0061] Ignoring the change in gas state parameters, the formula for calculating the radial flow velocity at the outlet of the suction cascade is:

[0062] C12m = C1m*Da / Db (m / s) (Formula 9)

[0063] Given that the peripheral blade angle βb in the cascade is π / 2.

[0064] Given that the flow angle at the outlet of the suction cascade is equal to the blade angle βb, the relative velocity W12, the absolute velocity C12, and the peripheral component C12u are calculated as follows:

[0065] W12 = C12m (m / s) (Formula 10)

[0066] C12u = Ub (m / s) (Formula 11)

[0067] C12 = (C12m2+ Ub2)0.5 (m / s) (Formula 12)

[0068] (2) Given that the inlet and outlet flow angles of the backflow cascade are equal to the blade angles βb and βa, respectively.

[0069] After determining the inlet radial flow velocity C21m of the cascade, the inlet flow velocity C21, the peripheral component C21u, and the relative velocity W21 are calculated as follows:

[0070] W21 = C21m (m / s) (Formula 13)

[0071] C21u = Ub(m / s) (Equation 14)

[0072] C21 = (Ub^2 + C21m^2)^0.5(m / s) (Equation 15)

[0073] The cascade outlet flow velocity C22, the radial flow velocity C22m, the circumferential component velocity C22u and the relative flow velocity W22 are calculated by the following equations:

[0074] C22m = C21m * Db / Da (m / s) (Equation 16)

[0075] W22 = C22m / sin βa (m / s) (Equation 17)

[0076] C22u = Ua + W22 * cos βa (m / s) (Equation 18)

[0077] C22 = (C22m^2 + C22u^2)^0.5 (m / s) (Equation 19)

[0078] (3) Assuming that the inlet and outlet flow angles of the return flow cascade are βa and βb respectively;

[0079] The cascade inlet flow velocity C31, the radial flow velocity C31m, the circumferential component velocity C31u and the relative flow velocity W31 are calculated by the following equations:

[0080] C31m = C22m * θ2 / θ3 (m / s) (Equation 20)

[0081] Wherein θ2 is the circumferential angle corresponding to the return flow cascade, rad

[0082] θ3 is the circumferential angle corresponding to the return flow cascade, rad

[0083] W31 = C31m / sin βa (m / s) (Equation 21)

[0084] C31u = Ua + W31 * cos βa (m / s) (Equation 22)

[0085] C31 = (C31u^2 + C31m^2)^0.5 (m / s) (Equation 23)

[0086] The cascade outlet flow velocity C32, the radial flow velocity C32m, the circumferential component velocity C32u and the relative flow velocity W32 are calculated by the following equations:

[0087] C32m = C31m * Da / Db (m / s) (Equation 24)

[0088] W32 = C32m (m / s) (Equation 25)

[0089] C32u = Ub (m / s) (Equation 26)

[0090] C32 = (C32m2+ Ub2)0'5 (m / s) (Equation 27)

[0091] (4) For analyzing the energy conversion relationship in the cascade, the gas flow along the "suction-rebound-return flow" route is divided into two control volumes of "suction-rebound" and "return flow".

[0092] The velocity triangle at the inlet and outlet of the "suction-rebound" section is shown in Figure 7 It is assumed that the radial component of the rebound cascade outflow velocity C22 is equal to the suction cascade inflow velocity C11, i.e. C22m = C11m, and the circumferential component of C22 is:

[0093] C22u = 2Ua (m / s) (Equation 28)

[0094] Substituting Equation (2) and Equation (28) into the Euler equation P = Ua * C22u - Ua * C11u, it can be seen that the Euler work obtained by the gas flowing through the "suction-rebound" cascade is:

[0095] P1 = 2 * Ua2 (Equation 29)

[0096] When the gas flows through the return flow cascade, the Euler work obtained by the gas is:

[0097] P2 = Ub * C32u - Ua * C31u

[0098] Substituting Equation (22), Equation (26) and Equation (21) into the above equation, we get:

[0099] P2 = Ua2 * ((Db / Da)2 - (1 + C31m / Ua / tan βa)) (Equation 30)

[0100] In the equation, Db / Da < 1, so P2 < 0, which is the expansion output work.

[0101] The total Euler work obtained by the gas flowing along the "suction-rebound-return flow" route is:

[0102] P = P1 + P2, i.e.

[0103] P = Ua2 * (1 + (Db / Da)2 - C31m / Ua / tan βa) (Equation 31)

[0104] When C31m < Ua * tan βa * (1 + (Db / Da)2), P > 0. It can be seen that when the filter wheel rotates, the gas flowing through the "suction-rebound-return flow" cascade can obtain positive Euler work, and the flow is realizable.

[0105] In another innovative structure of the present application, the mud removing device comprises a spiral rotor 909, a conveying groove 910, a shaft seal seat 905, a shaft seal 906, a bearing 901 and a bearing seat 902, a bearing seal 903, a cover 904, a transparent cover 911, a drain valve 907, a drain pipe 908, and a nozzle 912 arranged in the left and right channels of the air inlet chamber. When the fan is running, the accumulated water in the pool must be drained. The nozzle is opened to flush the filter wheel and the side wall of the air inlet chamber. As the water level in the pool rises and the lower rim of the filter wheel is immersed in water, the main shaft of the fan is rotated at a speed of 100-200 r / min to clean the adhering objects on the filter screen. After the water is drained, the mud removing mechanism is started, and the deposited sludge at the bottom of the pool can be discharged by the pushing of the spiral blades on the rotating shaft.

[0106] The above examples are only used to illustrate the present application and not to limit the technical solutions described in the present application. Although the present application has been described in detail with reference to the above embodiments, the present application is not limited to the above specific embodiments. Therefore, any modification or substitution of the present application; and all technical solutions and improvements without departing from the spirit and scope of the present application are covered in the scope of the claims of the present application.

Claims

1. A vehicle-mounted centrifugal fan with a mud removing device, characterized in that, The vehicle-mounted centrifugal fan comprises an air inlet chamber (1), a filter wheel (2), an impeller, a fan main shaft (3), a volute (18) and a mud removal device (9), the filter wheel (2) and the impeller are installed on the fan main shaft (3), and the filter wheel (2) is arranged in the air inlet chamber (1); the impeller is arranged in the volute (18), the filter wheel (2) is arranged before an inlet of the impeller, the inlet of the impeller is communicated with an outlet of the filter wheel (2), and the mud removal device (9) is arranged in the air inlet chamber (1); a partition plate is arranged in the air inlet chamber (1), the partition plate divides the air inlet chamber into an upper air suction area and a lower back flushing area, the partition plate is composed of a first partition plate (102), a second partition plate (103) and a third partition plate (104), the filter wheel (2) is provided with a blade row in a circumferential direction, the first partition plate (102), the second partition plate (103) and the third partition plate (104) are arranged along the circumferential direction of the blade row in sequence, the blade row between the first partition plate (102) and the third partition plate (104) is an air suction blade row, the air suction blade row is communicated with the air suction area in the upper part of the air inlet chamber (1) and a circumferential space in the filter wheel (2), the blade row between the first partition plate (102) and the second partition plate (103) is a back flushing blade row, the back flushing blade row is communicated with the circumferential space in the filter wheel (2) and the back flushing area in the lower part of the air inlet chamber (1), and the blade row between the second partition plate (103) and the third partition plate (104) is a back flow blade row, which is communicated with the back flushing area in the lower part of the air inlet chamber (1) and the circumferential space in the filter wheel (2).

2. A vehicle-mounted centrifugal fan with a mud removing device according to claim 1, characterized in that, The impeller comprises a primary impeller (10) and a secondary impeller (13), and the filter wheel (2) is arranged before an inlet of the primary impeller (10).

3. A vehicle-mounted centrifugal fan with a mud removing device according to claim 2, characterized in that, The mud removal device (9) is arranged at the bottom of the air inlet chamber (1) and below the filter wheel (2).

4. A vehicle-mounted centrifugal fan with a mud removing device according to claim 3, characterized in that, The mud removal device (9) comprises a spiral rotor (908) with a rotating shaft, a semi-open conveying groove (909), a shaft seal seat (905), a shaft seal (906), a bearing (901) and a bearing seat (902), a bearing seal (903), a cover (904) and a transparent cover (910), a drain valve (907) and a plurality of nozzles (911) arranged in passages on both sides of the air inlet chamber (1).

5. A vehicle-mounted centrifugal fan with a mud removing device according to claim 4, characterized in that, The spiral rotor (908) is arranged in the semi-open conveying groove (909), and the drain valve (907) is connected with the spiral rotor (908) in a pipeline mode.

6. A vehicle-mounted centrifugal fan with a mud removing device according to claim 5, characterized in that, The nozzles can be opened to flush the filter wheel and the side wall of the air inlet chamber, and when the water level in the pool is higher than the lower rim of the filter wheel, the fan main shaft is rotated at a speed of 100-200 r / min to clean the adhering objects on the filter screen.

7. A vehicle-mounted centrifugal fan with a mud removing device according to claim 6, characterized in that, When the mud needs to be discharged, the water is discharged, and then the mud removal device (9) is started to discharge the sludge.

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