Gas transmission method of light-weight large-flow two-stage centrifugal blower for snow sweeper

Abstract

The invention provides a gas transmission method of a light-weight large-flow two-stage centrifugal blower for a snow sweeper, the centrifugal blower is provided with a stator assembly and a rotor assembly, the stator assembly comprises a gas inlet volute and a gas exhaust shell, a gas inlet channel is arranged in the gas inlet volute, a backflow shell and a gas exhaust volute are fixedly arranged in the gas exhaust shell, and a gas outlet channel is arranged in the backflow shell. The backflow shell is axially and fixedly connected with the exhaust volute and comprises a first backflow plate, a second backflow plate and a third backflow plate, a backflow channel is formed among the first backflow plate, the second backflow plate and the air inlet volute, the rotor assembly comprises a main shaft and impellers, and the impellers comprise the first-stage impeller and the second-stage impeller. The exhaust channel in the centrifugal blower is wide, the gas transmission flow can be increased, large-flow transmission is achieved, the backflow shell is subjected to weight reduction treatment, the overall weight of the centrifugal blower is reduced, and therefore the bearing burden of the snow sweeper is reduced, and the snow removal efficiency of the snow sweeper is improved. The invention can be widely applied to centrifugal blowers.

Description

Technical Field

[0001] The present invention relates to a gas transmission method, in particular to a gas transmission method for a lightweight large-flow double-stage centrifugal blower used in a snow removal vehicle. Background Art

[0003] A centrifugal blower belongs to a driven fluid machine. The rotation of the impeller is generated by the input mechanical energy to produce a centrifugal force, thereby squeezing air and increasing the gas pressure. The gas moves radially under the drive of the impeller to achieve the pressurization and transportation of the gas.

[0004] When a centrifugal blower is applied to a snow removal vehicle, since the exhaust channels of most current centrifugal blowers are relatively narrow, when the snow removal vehicle is performing snow removal operations, problems such as a small snow removal area and low efficiency occur. And, as can be seen from the attachment Figure 1 It can be seen that the return casings in most current centrifugal blowers are formed by casting, with complex structures and large weights, which additionally increase the load-bearing burden of the snow removal vehicle and further reduce the snow removal efficiency of the snow removal vehicle. Summary of the Invention

[0006] In view of the above technical problems, the present invention provides a gas transmission method for a lightweight large-flow double-stage centrifugal blower used in a snow removal vehicle. The exhaust channel in this centrifugal blower is relatively wide, which can increase the gas transmission flow rate to achieve large-flow transmission. And, the weight of the return casing is reduced to lower the overall weight of the centrifugal blower, thereby reducing the load-bearing burden of the snow removal vehicle and improving the snow removal efficiency of the snow removal vehicle.

[0007] To this end, the technical solution of the present invention is a gas transmission method for a lightweight large-flow double-stage centrifugal blower used in a snow removal vehicle, including the following steps: Step (1): Start the motor. The motor drives the main shaft to rotate. While the main shaft rotates, it drives the first-stage impeller and the second-stage impeller to rotate synchronously. At this time, the gas enters from the outer port of the intake channel. Step (2): The gas entering the intake channel forms a circumferential flow under the action of the volute structure of the intake volute and enters the intake port located at the inner circumference of the first-stage impeller. Step (3): The gas entering the intake port of the first-stage impeller diffuses outward in the circumferential direction under the action of the centrifugal force generated by the rotation of the impeller, enters the exhaust port located at the outer circumference of the first-stage impeller, and then enters the interior of the return channel through the exhaust port. Step (4): The gas entering the interior of the return channel forms a regular flow under the U-shaped guiding action of the return channel, avoiding the formation of eddies at the exhaust port of the first-stage impeller. Subsequently, the gas enters the intake port of the second-stage impeller. Step (5): The gas entering the inlet of the secondary impeller diffuses outward in the circumferential direction under the action of the centrifugal force generated by the rotation of the impeller, enters the exhaust port of the secondary impeller, and then enters the interior of the exhaust guiding channel through the exhaust port. At this time, the exhaust guiding channel guides and diverts the entering gas to prevent the gas discharged from the exhaust port of the secondary impeller from forming a vortex at the exhaust port position. Subsequently, the gas enters the interior of the exhaust channel through the exhaust guiding channel. At this time, under the action of the volute structure of the exhaust volute, the gas forms a circumferential flow and finally is discharged outward through the exhaust channel, completing the gas transmission.

[0008] Preferably, the lightweight large-flow double-stage centrifugal blower used in the gas transmission method of the above snow removal vehicle's lightweight large-flow double-stage centrifugal blower is provided with a stator assembly and a rotor assembly. The rotor assembly is located inside the stator assembly and can rotate inside the stator assembly; The stator assembly includes an inlet volute and an exhaust housing. The inlet volute and the exhaust housing are axially fixedly connected. An inlet channel is provided inside the inlet volute. A return housing and an exhaust volute are fixedly provided inside the exhaust housing. The return housing and the exhaust volute are axially fixedly connected; The return housing includes a first return plate, a second return plate, and a third return plate. The first return plate is located on the left side of the second return plate, the third return plate is located on the right side of the second return plate. The first return plate, the second return plate, and the third return plate are sequentially axially fixedly connected. The second return plate is fixedly connected to the exhaust housing. A return channel is formed between the first return plate, the second return plate, and the inlet volute; The rotor assembly includes a main shaft and an impeller. The impeller is fixedly arranged on the outer circumference of the main shaft. The impeller includes a primary impeller and a secondary impeller. The primary impeller and the secondary impeller are arranged axially along the outer circumference of the main shaft. The return housing is located between the primary impeller and the secondary impeller. The inlet of the primary impeller is communicated with the exhaust port of the inlet volute. The exhaust port of the primary impeller is communicated with one side port of the return channel. The other side port of the return channel is communicated with the inlet of the secondary impeller. The exhaust port of the secondary impeller is communicated with the inlet of the exhaust volute; On the outer circumference of the main shaft at the position inside the inlet volute, a sealing shaft sleeve and an inlet side end cover are respectively arranged from the inside to the outside. The inner circumference of the sealing shaft sleeve and the outer circumference of the main shaft are rotationally sealed with each other. The outer circumference of the sealing shaft sleeve is fixedly connected to one side of the inlet side end cover. The other side of the inlet side end cover is fixedly connected to the axial outer side of the inlet volute. After the inlet side end cover is fixedly connected to the inlet volute, a complete inlet channel is formed inside the inlet volute; A bearing is provided at the position outside the sealing shaft sleeve between the main shaft and the inlet side end cover. The inner ring of the bearing is fixedly connected to the main shaft, and the outer ring of the bearing is fixedly connected to the inlet side end cover; The outer circumference of the main shaft is located inside the exhaust volute. A sealing shaft sleeve and a second end cover on the exhaust side are respectively arranged from the inside to the outside. A rotary seal is provided between the inner circumference of the sealing shaft sleeve and the outer circumference of the main shaft. The outer side of the sealing shaft sleeve is fixedly connected to one side of the second end cover on the exhaust side, and the other side of the second end cover on the exhaust side is fixedly connected to the axial outer side of the exhaust volute. After the second end cover on the exhaust side is fixedly connected to the exhaust volute, a complete exhaust passage is formed in the exhaust volute; On the axial outer side of the second end cover on the exhaust side, a first end cover on the exhaust side is fixedly arranged at the position of the outer circumference of the main shaft. A rotary seal is provided between the axial inner side of the inner circumference of the first end cover on the exhaust side and the outer circumference of the main shaft. A bearing is provided between the axial outer side of the inner circumference of the first end cover on the exhaust side and the outer circumference of the main shaft. The inner ring of the bearing is fixedly connected to the main shaft, and the outer ring of the bearing is fixedly connected to the first end cover on the exhaust side.

[0009] Preferably, the longitudinal cross-sectional shape of the reflux passage is U-shaped.

[0010] Preferably, a first guide plate is arranged at the position adjacent to the left side of the exhaust port of the first-stage impeller. One end of the first guide plate is fixedly connected to the inlet volute, and the other end of the first guide plate is fixedly connected to the exhaust housing.

[0011] Preferably, the third reflux plate is located at the position adjacent to the left side of the exhaust port of the second-stage impeller. A second guide plate is arranged at the position adjacent to the right side of the exhaust port of the second-stage impeller. The second guide plate is fixedly connected to the exhaust volute; An exhaust guide passage is formed between the third reflux plate and the second guide plate.

[0012] Preferably, a motor is fixedly arranged on the axial left side of the main shaft, and the main shaft is driven to rotate by the motor.

[0013] Preferably, flanges are respectively fixedly arranged on the outermost ports of the intake passage and the exhaust passage.

[0014] Preferably, the cross-sectional shape of the exhaust passage is rectangular, wherein the length dimension is 75 mm ± 5 mm and the width dimension is 32 mm ± 5 mm.

[0015] Preferably, an exhaust port is provided on the outermost side of the exhaust passage, and the cross-sectional shape of the exhaust port is trapezoidal.

[0016] Preferably, the first reflux plate and the second reflux plate are fixedly welded through reflux blades, the second reflux plate and the exhaust housing are fixedly welded, and the third reflux plate and the second reflux plate are fixedly welded.

[0017] The beneficial effects of the present invention are: 1. By setting a reflux channel with a U-shaped longitudinal section, it is possible to effectively guide and drain the incoming gas, prevent the gas from forming vortices inside the blower, thereby avoiding impact damage to the internal components of the blower and effectively reducing the operating noise.

[0018] 2. Since the cross-sectional shape of the exhaust channel is rectangular and the size of the exhaust channel is increased, the gas flow rate can be increased to achieve large-flow transmission of gas. At the same time, the cross-sectional shape of the exhaust port is trapezoidal, which further increases the snow removal area during snow removal operations, further improves the transmission flow rate, and enhances the snow removal efficiency of the snow removal vehicle.

[0019] 3. A motor is fixedly provided on the left side of the main shaft in the axial direction. The main shaft is driven to rotate by the motor. Since the motor is usually made of lightweight materials (such as aluminum alloy), while the motor often uses heavy materials (such as steel), driving the blower to operate through the motor can reduce the overall weight of the blower without affecting the operation efficiency of the blower, thereby reducing the load-bearing burden of the snow removal vehicle and further improving the snow removal efficiency of the snow removal vehicle.

[0020] 4. Since the first reflux plate, the second reflux plate, and the third reflux plate are all fixed by welding. Among them, the first reflux plate and the second reflux plate are welded and fixed through reflux blades, the second reflux plate and the exhaust housing are fixed by welding, and the third reflux plate and the second reflux plate are fixed by welding. Compared with the reflux housing of the prior art, its structure is simple. Moreover, since the first reflux plate, the second reflux plate, and the third reflux plate are all fixed by welding, the manufacturing cost is low, and the weight is light, further reducing the overall weight of the centrifugal blower, reducing the load-bearing burden of the snow removal vehicle, and improving the snow removal efficiency of the snow removal vehicle. Description of the Drawings

[0022] Figure 1 is a cross-sectional view of the structure of the centrifugal blower for a conventional snow removal vehicle; Figure 2 is a cross-sectional view of the main perspective structure of the present invention; Figure 3 is a cross-sectional view of the rear perspective structure of the present invention; Figure 4 is the present invention Figure 2 magnified view at A in.

[0023] Symbol Explanation in the Figures: 1. Stator assembly; 101. Inlet volute; 10101. Inlet passage; 102. Exhaust housing; 10201. Return housing; 10202. Exhaust volute; 10203. Exhaust port; 10204. First return plate; 10205. Second return plate; 10206. Third return plate; 10207. Return passage; 10208. Exhaust passage; 103. First guide plate; 104. Second guide plate; 2. Rotor assembly; 201. Main shaft; 202. Impeller; 20201. First-stage impeller; 20202. Second-stage impeller; 203. Bearing; 3. Inlet-side end cover; 4. First exhaust-side end cover; 5. Sealing shaft sleeve; 6. Exhaust guide passage; 7. Motor; 8. Flange; 9. Second exhaust-side end cover; 10. Return vane. Detailed implementation

[0025] The present invention will be further described below in conjunction with embodiments.

[0026] Through Figures 1 - 4 It can be seen that the lightweight large-flow double-stage centrifugal blower for snow removal vehicle is provided with a stator assembly 1 and a rotor assembly 2. The rotor assembly 2 is located inside the stator assembly 1 and can rotate inside the stator assembly 1.

[0027] The stator assembly 1 includes an inlet volute 101 and an exhaust housing 102. The inlet volute 101 and the exhaust housing 102 are axially fixedly connected. An inlet passage is provided in the inlet volute 101. A return housing 10201 and an exhaust volute 10202 are fixedly provided inside the exhaust housing 102. The return housing 10201 and the exhaust volute 10202 are axially fixedly connected; The return housing 10201 includes a first return plate 10204, a second return plate 10205 and a third return plate 10206. The first return plate 10204 is located on the left side of the second return plate 10205, and the third return plate 10206 is located on the right side of the second return plate 10205. A return passage 10207 is formed between the first return plate 10204, the second return plate 10205 and the inlet volute 101. The return passage 10207 can guide and drain the incoming gas, prevent the gas from forming eddy currents inside the blower, thereby causing impact damage to the internal components of the blower, and can also reduce noise.

[0028] The rotor assembly 2 includes a main shaft 201 and an impeller 202. The impeller 202 is fixedly arranged on the outer circumference of the main shaft 201. The impeller 202 includes a first-stage impeller 20201 and a second-stage impeller 20202. The first-stage impeller 20201 and the second-stage impeller 20202 are arranged axially along the outer circumference of the main shaft 201 respectively. The return flow housing 10201 is located between the first-stage impeller 20201 and the second-stage impeller 20202. The air inlet of the first-stage impeller 20201 is communicated with the exhaust port of the air inlet volute 101. The exhaust port of the first-stage impeller 20201 is communicated with one side port of the return flow channel 10207. The other side port of the return flow channel 10207 is communicated with the air inlet of the second-stage impeller 20202. The exhaust port of the second-stage impeller 20202 is communicated with the air inlet of the exhaust volute 10202.

[0029] When the blower is operating, after the gas enters from the air inlet of the air inlet volute 101, under the action of the volute structure, it forms a regular guiding flow, and then enters from the air inlet at the inner circumference position of the first-stage impeller 20201. After entering, under the action of the centrifugal force of the rotating impeller, the gas diffuses outward to the circumference and enters the interior of the return flow channel 10207 through the exhaust port at the outer circumference position of the first-stage impeller 20201. The return flow channel 10207 guides and buffers the entering gas. The gas enters the air inlet of the second-stage impeller 20202 through the return flow channel 10207. After entering, under the action of the centrifugal force of the rotating impeller, it enters the interior of the exhaust volute 10202 through the exhaust port of the second-stage impeller 20202. Finally, it is discharged from the exhaust port of the exhaust volute 10202 to perform the snow removal operation.

[0030] On the outer circumference of the main shaft 201 located inside the air inlet volute 101, a sealing shaft sleeve 5 and an air inlet side end cover 3 are respectively arranged from the inside to the outside. There is a rotating seal between the inner circumference of the sealing shaft sleeve 5 and the outer circumference of the main shaft 201. The outer circumference of the sealing shaft sleeve 5 is fixedly connected to one side of the air inlet side end cover 3. The other side of the air inlet side end cover 3 is fixedly connected to the axial outer side of the air inlet volute 101. After the air inlet side end cover 3 is fixedly connected to the air inlet volute 101, a complete air inlet channel 10101 is formed inside the air inlet volute 101. The outer port of the air inlet channel 10101 is communicated with the outside. A bearing 203 is arranged at the position outside the sealing shaft sleeve 5 between the main shaft 201 and the air inlet side end cover 3. The inner ring of the bearing 203 is fixedly connected to the main shaft 201, and the outer ring of the bearing 203 is fixedly connected to the air inlet side end cover 3.

[0031] On the outer circumference of the main shaft 201, which is located inside the exhaust volute 10202, a sealing shaft sleeve 5 and a second end cover 9 on the exhaust side are provided from the inside to the outside. There is a rotating seal between the inner circumference of the sealing shaft sleeve 5 and the outer circumference of the main shaft 201. The outer side of the sealing shaft sleeve 5 is fixedly connected to one side of the second end cover 9 on the exhaust side. The other side of the second end cover 9 on the exhaust side is fixedly connected to the axial outer side of the exhaust volute 10202. After the second end cover 9 on the exhaust side is fixedly connected to the exhaust volute 10202, a complete exhaust passage 10208 is formed inside the exhaust volute 10202.

[0032] On the axial outer side of the second end cover 9 on the exhaust side, at the position of the outer circumference of the main shaft 201, a first end cover 4 on the exhaust side is fixedly provided. There is a rotating seal between the axial inner side of the inner circumference of the first end cover 4 on the exhaust side and the outer circumference of the main shaft 201. Between the axial outer side of the inner circumference of the first end cover 4 on the exhaust side and the outer circumference of the main shaft 201, a bearing 203 is provided. The inner ring of the bearing 203 is fixedly connected to the main shaft 201, and the outer ring of the bearing 203 is fixedly connected to the first end cover 4 on the exhaust side.

[0033] Supported by the bearings 203 on both sides, the main shaft 201 realizes stable rotation.

[0034] In a specific embodiment, the longitudinal cross-sectional shape of the return passage 10207 is U-shaped. The U-shaped return passage 10207 can effectively guide and drain the incoming gas, prevent the gas from forming vortices inside the blower, thereby causing impact damage to the internal components of the blower, and can also reduce noise.

[0035] In a specific embodiment, a first guide plate 103 is provided adjacent to the left side of the exhaust port of the first-stage impeller 20201. One end of the first guide plate 103 is fixedly connected to the intake volute 101, and the other end of the first guide plate 103 is fixedly connected to the exhaust housing 102. Narrowing the passage on the side of the return passage 10207 close to the exhaust port of the first-stage impeller 20201 can accurately guide and drain the gas discharged from the first-stage impeller 20201, and further reduce the noise of gas flow.

[0036] In a specific embodiment, the third return plate 10206 is located adjacent to the left side of the exhaust port of the second-stage impeller 20202. A second guide plate 104 is provided adjacent to the right side of the exhaust port of the second-stage impeller 20202. The second guide plate 104 is fixedly connected to the exhaust volute 10202. An exhaust guide passage 6 is formed between the third return plate 10206 and the second guide plate 104. Through the exhaust guide passage 6, the gas discharged from the exhaust port of the second-stage impeller 20202 can be guided and drained, enabling the gas to smoothly enter the exhaust passage 10208, avoiding the generation of vortices, and thus reducing noise.

[0037] In a specific embodiment, a motor 7 is fixedly provided on the left side in the axial direction of the main shaft 201. The main shaft 201 is driven to rotate by the motor 7. Since motors are usually made of lightweight materials (such as aluminum alloy), while electric motors often use heavy materials (such as steel), on the premise of not affecting the operation efficiency of the blower, driving the blower to operate through the motor can reduce the overall weight of the blower, thereby reducing the load-bearing burden of the snow removal vehicle and further improving the snow removal efficiency of the snow removal vehicle.

[0038] In a specific embodiment, flanges 8 are respectively fixedly provided on the outermost ports of the air inlet passage 101018 and the exhaust passage 10208. Quick disassembly and assembly can be achieved through the flanges 8, improving the operation efficiency.

[0039] In a specific embodiment, the cross-sectional shape of the exhaust passage 10208 is rectangular, wherein the length dimension is 75 mm ± 5 mm and the width dimension is 32 mm ± 5 mm. Its cross-sectional area can be calculated to be approximately 2400 mm, while the cross-sectional area of the exhaust passage of the existing centrifugal blower shown in the attachment is about 780 mm. By increasing the size of the exhaust passage 10208, the gas flow rate can be increased, realizing large-flow transmission of gas and improving the snow removal efficiency of the snow removal vehicle. Figure 1 In the attachment, the cross-sectional area of the exhaust passage of the existing centrifugal blower is about 780 mm. By increasing the size of the exhaust passage 10208, the gas flow rate can be increased, realizing large-flow transmission of gas and improving the snow removal efficiency of the snow removal vehicle.

[0040] In a specific embodiment, an exhaust port 10203 is provided on the outermost side of the exhaust passage 10208. The cross-sectional shape of the exhaust port 10203 is trapezoidal, further increasing the snow removal area during snow removal operations, realizing large-flow transmission, and improving the snow removal efficiency of the snow removal vehicle.

[0041] In a specific embodiment, the first return plate 10204, the second return plate 10205, and the third return plate 10206 are all fixed by welding. Among them, the first return plate 10204 and the second return plate 10205 are fixed by welding through the return blades 10, the second return plate 10205 and the exhaust housing 102 are fixed by welding, and the third return plate 10206 and the second return plate 10205 are fixed by welding.

[0042] Through Figure 1 、 Figure 2 It can be seen that compared with the return housing 10201 of the prior art, the structure of this return housing 10201 is simple. Moreover, the first return plate 10204, the second return plate 10205, and the third return plate 10206 are all fixed by welding, with low manufacturing cost, and light weight, further reducing the overall weight of the centrifugal blower, reducing the load-bearing burden of the snow removal vehicle, and improving the snow removal efficiency of the snow removal vehicle. At present, the return housings in most centrifugal blowers are cast, with complex structures and large weights, additionally increasing the load-bearing burden of the snow removal vehicle and reducing the snow removal efficiency of the snow removal vehicle.

[0043] In a specific embodiment, the thicknesses of the first return plate 10204, the second return plate 10205, the third return plate 10206, the first guide plate 103 and the second guide plate 104 are all 1.5 mm ± 0.2 mm. The setting of this dimensional range can, on the one hand, ensure that during the gas transmission process, each plate component will not shake, avoid extra noise during the transmission process, and fully meet the normal transmission of the gas. On the other hand, it can minimize the overall weight of the blower and achieve the lightweight effect of the blower.

[0044] The method for realizing gas transmission by the lightweight large-flow double-stage centrifugal blower for snow removal vehicles includes the following steps: Step (1): Start the motor 7. The motor 7 drives the main shaft 201 to rotate. While the main shaft 201 rotates, it drives the first-stage impeller 20201 and the second-stage impeller 20202 to rotate synchronously. At this time, the gas enters from the outer port of the air inlet passage 10101. Step (2): The gas entering the air inlet passage 10101 forms a circumferential flow under the action of the volute structure of the air inlet volute 101 and enters the air inlet located at the inner circumferential position of the first-stage impeller 20201. Step (3): The gas entering the air inlet of the first-stage impeller 20201 diffuses outward in the circumferential direction under the action of the centrifugal force generated by the rotation of the impeller, enters the exhaust port located at the outer circumferential position of the first-stage impeller 20201, and then enters the inside of the return passage 10207 through the exhaust port. Step (4): The gas entering the inside of the return passage 10207 forms a regular flow under the U-shaped guiding action of the return passage 10207, avoiding the formation of eddy currents at the exhaust port of the gas discharged from the exhaust port of the first-stage impeller 20201. Subsequently, the gas enters the air inlet of the second-stage impeller 20202. Step (5): The gas entering the air inlet of the second-stage impeller 20202 diffuses outward in the circumferential direction under the action of the centrifugal force generated by the rotation of the impeller, enters the exhaust port of the second-stage impeller 20202, and then enters the inside of the exhaust guiding passage 6 through the exhaust port. At this time, the exhaust guiding passage 6 forms a guiding drainage for the entering gas, avoiding the formation of eddy currents at the exhaust port of the gas discharged from the exhaust port of the second-stage impeller 20202. Subsequently, the gas enters the inside of the exhaust passage 10208 through the exhaust guiding passage 6. At this time, the gas forms a circumferential flow under the action of the volute structure of the exhaust volute 10202 and is finally discharged outward through the exhaust passage 10208 to complete the gas transmission.

[0045] However, the above are only specific embodiments of the present invention and should not be used to limit the scope of implementation of the present invention. Therefore, the replacement of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of the present invention shall still fall within the scope covered by the claims of the present invention.

Claims

1. A gas transmission method for a lightweight high-flow double-stage centrifugal blower of a snow removal vehicle, characterized in that: It includes the following steps: Step (1): Start the motor. The motor drives the main shaft to rotate. While the main shaft is rotating, it drives the first-stage impeller and the second-stage impeller to rotate synchronously. At this time, the gas enters from the outer port of the intake passage; Step (2): The gas entering the intake passage forms a circumferential flow under the action of the volute structure of the intake volute and enters the intake port located at the inner circumferential position of the first-stage impeller; Step (3): The gas entering the intake port of the first-stage impeller diffuses outward in the circumferential direction under the action of the centrifugal force generated by the rotation of the impeller, enters the exhaust port located at the outer circumferential position of the first-stage impeller, and then enters the interior of the return passage through the exhaust port; Step (4): The gas entering the interior of the return passage forms a regular flow under the U-shaped guiding action of the return passage, avoiding the formation of eddy currents at the exhaust port where the gas discharged from the exhaust port of the first-stage impeller is located. Subsequently, the gas enters the intake port of the second-stage impeller; Step (5): The gas entering the intake port of the second-stage impeller diffuses outward in the circumferential direction under the action of the centrifugal force generated by the rotation of the impeller, enters the exhaust port of the second-stage impeller, and then enters the interior of the exhaust guiding passage through the exhaust port. At this time, the exhaust guiding passage forms a guiding drainage for the entering gas, avoiding the formation of eddy currents at the exhaust port where the gas discharged from the exhaust port of the second-stage impeller is located. Subsequently, the gas enters the interior of the exhaust passage through the exhaust guiding passage. At this time, the gas forms a circumferential flow under the action of the volute structure of the exhaust volute and is finally discharged outward through the exhaust passage, completing the transmission of the gas.

2. The gas transmission method of the lightweight high-flow double-stage centrifugal blower for snow removal vehicles according to claim 1, characterized in that: The centrifugal blower is provided with a stator assembly and a rotor assembly. The rotor assembly is located inside the stator assembly and can rotate inside the stator assembly; The stator assembly includes an intake volute and an exhaust housing. The intake volute and the exhaust housing are axially fixedly connected. An intake passage is provided inside the intake volute. A return housing and an exhaust volute are fixedly provided inside the exhaust housing. The return housing and the exhaust volute are axially fixedly connected; The return housing includes a first return plate, a second return plate, and a third return plate. The first return plate is located on the left side of the second return plate, and the third return plate is located on the right side of the second return plate. The first return plate, the second return plate, and the third return plate are axially fixedly connected in sequence. The second return plate is fixedly connected to the exhaust housing. A return passage is formed between the first return plate, the second return plate, and the intake volute; The rotor assembly includes a main shaft and an impeller. The impeller is fixedly arranged on the outer circumference of the main shaft. The impeller includes a first-stage impeller and a second-stage impeller. The first-stage impeller and the second-stage impeller are arranged axially along the outer circumference of the main shaft. The return housing is located between the first-stage impeller and the second-stage impeller. The intake port of the first-stage impeller is communicated with the exhaust port of the intake volute. The exhaust port of the first-stage impeller is communicated with one side port of the return passage. The other side port of the return passage is communicated with the intake port of the second-stage impeller. The exhaust port of the second-stage impeller is communicated with the intake port of the exhaust volute; On the outer circumference of the main shaft, inside the air inlet volute, a sealing shaft sleeve and an air inlet side end cover are provided from the inside outwards. Between the inner circumference of the sealing shaft sleeve and the outer circumference of the main shaft, there is a rotary seal. The outer circumference of the sealing shaft sleeve is fixedly connected to one side of the air inlet side end cover, and the other side of the air inlet side end cover is fixedly connected to the axial outer side of the air inlet volute. After the air inlet side end cover is fixedly connected to the air inlet volute, a complete air inlet passage is formed inside the air inlet volute; Between the main shaft and the air inlet side end cover, at the position outside the sealing shaft sleeve, a bearing is provided. The inner ring of the bearing is fixedly connected to the main shaft, and the outer ring of the bearing is fixedly connected to the air inlet side end cover; On the outer circumference of the main shaft, inside the exhaust volute, a sealing shaft sleeve and an exhaust side second end cover are provided from the inside outwards. Between the inner circumference of the sealing shaft sleeve and the outer circumference of the main shaft, there is a rotary seal. The outside of the sealing shaft sleeve is fixedly connected to one side of the exhaust side second end cover, and the other side of the exhaust side second end cover is fixedly connected to the axial outer side of the exhaust volute. After the exhaust side second end cover is fixedly connected to the exhaust volute, a complete exhaust passage is formed inside the exhaust volute; On the axial outer side of the exhaust side second end cover, at the position of the outer circumference of the main shaft, an exhaust side first end cover is fixedly provided. Between the axial inner side of the inner circumference of the exhaust side first end cover and the outer circumference of the main shaft, there is a rotary seal. Between the axial outer side of the inner circumference of the exhaust side first end cover and the outer circumference of the main shaft, a bearing is provided. The inner ring of the bearing is fixedly connected to the main shaft, and the outer ring of the bearing is fixedly connected to the exhaust side first end cover.

3. The gas transmission method of the lightweight high-flow double-stage centrifugal blower for snow removal vehicles according to claim 2, characterized in that: The longitudinal cross-sectional shape of the return passage is U-shaped.

4. The gas transmission method of the lightweight high-flow double-stage centrifugal blower for snow removal vehicles according to claim 3, characterized in that: At the left adjacent position of the exhaust port of the first-stage impeller, a first guide plate is provided. One end of the first guide plate is fixedly connected to the air inlet volute, and the other end of the first guide plate is fixedly connected to the exhaust housing.

5. The gas transmission method of the lightweight large-flow double-stage centrifugal blower for snow removal vehicles according to claim 4, characterized in that: The third return plate is located at the left adjacent position of the exhaust port of the second-stage impeller. At the right adjacent position of the exhaust port of the second-stage impeller, a second guide plate is provided. The second guide plate is fixedly connected to the exhaust volute; An exhaust guiding passage is formed between the third return plate and the second guide plate.

6. The gas transmission method of the lightweight high-flow double-stage centrifugal blower for snow removal vehicles according to claim 2, characterized in that: On the axial left side of the main shaft, a motor is fixedly provided, and the main shaft is driven to rotate by the motor.

7. The gas transmission method of the lightweight large-flow double-stage centrifugal blower for snow removal vehicles according to claim 2, characterized in that: Flanges are respectively fixedly provided on the outermost side ports of the air inlet passage and the exhaust passage.

8. The gas transmission method of the lightweight large-flow double-stage centrifugal blower for snow removal vehicles according to claim 7, characterized in that: The cross-sectional shape of the exhaust passage is rectangular, wherein the length dimension is 75 mm ± 5 mm, and the width dimension is 32 mm ± 5 mm.

9. The gas transmission method of the lightweight large-flow double-stage centrifugal blower for snow removal vehicles according to claim 8, characterized in that: On the outermost side of the exhaust passage, an exhaust port is provided, and the cross-sectional shape of the exhaust port is trapezoidal.

10. The gas transmission method of the lightweight high-flow double-stage centrifugal blower for snow removal vehicles according to any one of claims 2-9, characterized in that: Between the first return plate and the second return plate, they are fixedly welded by return blades. Between the second return plate and the exhaust housing, they are fixedly welded. Between the third return plate and the second return plate, they are fixedly welded.

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