Lightweight large-flow two-stage centrifugal blower for snow sweeper

Abstract

The light-weight large-flow two-stage centrifugal blower for the snow sweeper is provided with a stator assembly and a rotor assembly, the stator assembly comprises an air inlet volute and an air exhaust shell, the air inlet volute and the air exhaust shell are axially and fixedly connected, an air inlet channel is formed in the air inlet volute, a backflow shell and an air exhaust volute are fixedly arranged in the air exhaust shell, and an air outlet channel is formed 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 centrifugal blower can be widely applied to centrifugal blowers.

Description

Technical Field

[0001] This utility model relates to a centrifugal blower, and more particularly to a lightweight, high-flow-rate, two-stage centrifugal blower for snowplows. Background Technology

[0002] Centrifugal blowers are a type of driven fluid machinery. By inputting mechanical energy, the impeller rotates to generate centrifugal force, thereby compressing air and increasing gas pressure. The gas moves radially under the drive of the impeller, thus achieving gas pressurization and transportation.

[0003] When centrifugal blowers are used in snowplows, the narrow exhaust channels of most current centrifugal blowers result in problems such as small snow removal area and low efficiency during snow removal operations. Furthermore, according to the attached... Figure 1 It can be seen that the return casing in most centrifugal blowers is currently cast, which has a complex structure and heavy weight, adding extra load to the snowplow and further reducing the snow removal efficiency of the snowplow. Utility Model Content

[0004] This utility model addresses the above-mentioned technical problems by providing a lightweight, high-flow-rate, two-stage centrifugal blower for snowplows. The centrifugal blower has a wider exhaust channel, which increases the gas transmission flow rate and enables high-flow-rate transmission. Furthermore, the return housing is weight-reduced to lower the overall weight of the centrifugal blower, thereby reducing the load on the snowplow and improving its snow removal efficiency.

[0005] Therefore, the technical solution of this utility model is a lightweight, high-flow-rate, two-stage centrifugal blower for snow removal vehicles, which 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.

[0006] The stator assembly includes an intake volute and an exhaust housing, which are axially fixedly connected. The intake volute is provided with an intake channel, and the exhaust housing is fixedly provided with a return housing and an exhaust volute. The return housing and the exhaust volute are axially fixedly connected.

[0007] The reflux housing includes a first reflux plate, a second reflux plate, and a third reflux plate. The first reflux plate is located to the left of the second reflux plate, and the third reflux plate is located to the right of the second reflux plate. The first reflux plate, the second reflux plate, and the third reflux plate are axially fixedly connected in sequence. The second reflux plate is fixedly connected to the exhaust housing. A reflux channel is formed between the first reflux plate, the second reflux plate, and the intake volute.

[0008] The rotor assembly includes a main shaft and an impeller. The impeller is fixedly mounted on the outer circumference of the main shaft. The impeller includes a first-stage impeller and a second-stage impeller, which are arranged axially on the outer circumference of the main shaft. The return casing is located between the first-stage impeller and the second-stage impeller. The air inlet of the first-stage impeller is connected to the exhaust port of the air inlet volute. The exhaust port of the first-stage impeller is connected to one side port of the return channel. The other side port of the return channel is connected to the air inlet of the second-stage impeller. The exhaust port of the second-stage impeller is connected to the air inlet of the exhaust volute.

[0009] The outer circumference of the main shaft is located inside the intake volute. From the inside out, there are a sealing bushing and an intake side end cover. The inner circumference of the sealing bushing and the outer circumference of the main shaft rotate and seal each other. The outer circumference of the sealing bushing is fixedly connected to one side of the intake side end cover. The other side of the intake side end cover is fixedly connected to the axial outer side of the intake volute. After the intake side end cover is fixedly connected to the intake volute, a complete intake channel is formed inside the intake volute.

[0010] A bearing is provided between the main shaft and the intake side end cover, located outside the sealing bushing. 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 intake side end cover.

[0011] The outer circumference of the main shaft is located inside the exhaust volute. From the inside out, there are a sealing bushing and an exhaust-side second end cover. The inner circumference of the sealing bushing and the outer circumference of the main shaft rotate and seal against each other. The outer side of the sealing bushing is fixedly connected to one side of the exhaust-side second end cover. 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 channel is formed inside the exhaust volute.

[0012] An exhaust-side first end cover is fixedly installed on the outer side of the second end cover on the exhaust side, located on the outer circumference of the main shaft. The inner circumference of the first end cover on the exhaust side rotates and seals with the outer circumference of the main shaft. A bearing is provided between 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.

[0013] A motor is fixedly installed on the left side of the spindle, and the spindle is driven to rotate by the motor.

[0014] Preferably, the longitudinal cross-sectional shape of the return channel is U-shaped.

[0015] Preferably, a first guide plate is provided on the left side adjacent to the exhaust port of the first stage impeller. One end of the first guide plate is fixedly connected to the intake volute, and the other end of the first guide plate is fixedly connected to the exhaust casing.

[0016] Preferably, the third return plate is located on the left side adjacent to the exhaust port of the second-stage impeller, and a second guide plate is provided on the right side adjacent to the exhaust port of the second-stage impeller. The second guide plate is fixedly connected to the exhaust volute.

[0017] An exhaust guide channel is formed between the third return plate and the second guide plate.

[0018] Preferably, flanges are fixedly provided on the outermost ports of the air intake passage and the air exhaust passage, respectively.

[0019] Preferably, the exhaust channel has a rectangular cross-sectional shape, with a length of 75mm ± 5mm and a width of 32mm ± 5mm.

[0020] Preferably, the outermost part of the exhaust channel is provided with an exhaust port, and the cross-sectional shape of the exhaust port is trapezoidal.

[0021] Preferably, the first return plate and the second return plate are fixed together by welding return blades, the second return plate is fixed together with the exhaust housing by welding, and the third return plate is fixed together with the second return plate by welding.

[0022] The beneficial effects of this utility model are:

[0023] 1. By setting a U-shaped return channel, the incoming gas can be effectively guided and diverted, preventing the gas from forming eddies inside the blower, which would cause impact damage to the internal components of the blower and effectively reduce operating noise.

[0024] 2. Because the exhaust channel has a rectangular cross-sectional shape and its size is increased, the gas flow rate can be increased, enabling high-flow gas transmission. 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 improving the transmission flow rate and the snow removal efficiency of the snowplow.

[0025] 3. A motor is fixed on the left side of the main shaft to drive the main shaft to rotate. Since motors are usually made of lightweight materials (such as aluminum alloys) while electric motors are often made of heavy materials (such as steel), driving the blower with a motor can reduce the overall weight of the blower without affecting its operating efficiency. This reduces the load on the snowplow and further improves its snow removal efficiency.

[0026] 4. Since the first, second, and third return plates are all fixed by welding, specifically, the first and second return plates are fixed by welding through return blades, the second return plate is fixed by welding to the exhaust casing, and the third return plate is fixed by welding to the second return plate, its structure is simpler compared to the return casing of the prior art. Furthermore, since the first, second, and third return plates 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 on the snowplow, and improving the snow removal efficiency of the snowplow. Attached Figure Description

[0027] Figure 1 This is a cross-sectional view of the structure of a centrifugal blower used in existing snowplows;

[0028] Figure 2 This is a front-view structural cross-sectional view of this utility model;

[0029] Figure 3 This is a rear-view structural cross-sectional view of the present invention;

[0030] Figure 4 This is a utility model Figure 2 Enlarged view of point A in the middle.

[0031] Explanation of symbols in the diagram:

[0032] 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. Exhaust side first end cover; 5. Sealing bushing; 6. Exhaust guide passage; 7. Motor; 8. Flange; 9. Exhaust side second end cover; 10. Return blade. Detailed Implementation

[0033] The present invention will be further described below with reference to the embodiments.

[0034] pass Figures 1-4 It can be seen that the snowplow uses a lightweight, high-flow-rate, two-stage centrifugal blower, which is equipped 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.

[0035] The stator assembly 1 includes an intake volute 101 and an exhaust housing 102, which are axially fixedly connected. The intake volute 101 is provided with an intake channel. The exhaust housing 102 is fixedly provided with a return housing 10201 and an exhaust volute 10202, which are axially fixedly connected.

[0036] 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 to the left of the second return plate 10205, and the third return plate 10206 is located to the right of the second return plate 10205. A return channel 10207 is formed between the first return plate 10204, the second return plate 10205, and the intake volute 101. The return channel 10207 can guide and divert the incoming gas, prevent the gas from forming eddies inside the blower, thereby causing impact damage to the internal components of the blower, and reduce noise.

[0037] The rotor assembly 2 includes a main shaft 201 and an impeller 202. The impeller 202 is fixedly disposed 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 on the outer circumference of the main shaft 201. The return 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 connected to the exhaust port of the air inlet volute 101. The exhaust port of the first-stage impeller 20201 is connected to one side port of the return channel 10207. The other side port of the return channel 10207 is connected to the air inlet of the second-stage impeller 20202. The exhaust port of the second-stage impeller 20202 is connected to the air inlet of the exhaust volute 10202.

[0038] When the blower is running, gas enters through the inlet of the inlet casing 101. Under the action of the casing structure, it forms a regular guided flow. Then, it enters through the inlet at the inner circumference of the first-stage impeller 20201. After entering, under the centrifugal force of the impeller rotation, the gas diffuses outward and enters the interior of the return channel 10207 through the exhaust port at the outer circumference of the first-stage impeller 20201. The return channel 10207 guides and buffers the entering gas. The gas then enters the inlet of the second-stage impeller 20202 through the return channel 10207. After entering, under the centrifugal force of the impeller rotation, it enters the interior of the exhaust casing 10202 through the exhaust port of the second-stage impeller 20202. Finally, it is discharged from the exhaust port of the exhaust casing 10202, thus performing snow removal operations.

[0039] The outer circumference of the main shaft 201 is located inside the intake volute 101, and from the inside out, there are a sealing bushing 5 and an intake side end cover 3. The inner circumference of the sealing bushing 5 and the outer circumference of the main shaft 201 rotate and seal each other. The outer circumference of the sealing bushing 5 is fixedly connected to one side of the intake side end cover 3, and the other side of the intake side end cover 3 is fixedly connected to the axial outer side of the intake volute 101. After the intake side end cover 3 is fixedly connected to the intake volute 101, a complete intake channel 10101 is formed inside the intake volute 101. The outer port of the intake channel 10101 is connected to the outside. A bearing 203 is provided between the main shaft 201 and the intake side end cover 3, located outside the sealing bushing 5. 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 intake side end cover 3.

[0040] The outer circumference of the main shaft 201 is located inside the exhaust volute 10202. From the inside out, there are a sealing bushing 5 and an exhaust-side second end cover 9. The inner circumference of the sealing bushing 5 and the outer circumference of the main shaft 201 rotate and seal each other. The outer side of the sealing bushing 5 is fixedly connected to one side of the exhaust-side second end cover 9. The other side of the exhaust-side second end cover 9 is fixedly connected to the axial outer side of the exhaust volute 10202. After the exhaust-side second end cover 9 is fixedly connected to the exhaust volute 10202, a complete exhaust channel 10208 is formed inside the exhaust volute 10202.

[0041] An exhaust-side first end cover 4 is fixedly installed on the outer side of the exhaust-side second end cover 9, located on the outer circumference of the main shaft 201. The inner circumference of the exhaust-side first end cover 4 is axially sealed with the outer circumference of the main shaft 201. A bearing 203 is provided between the inner circumference of the exhaust-side first end cover 4 and the outer circumference of the main shaft 201. 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 exhaust-side first end cover 4.

[0042] The spindle 201 achieves stable rotation under the support of the bearings 203 on both sides.

[0043] In one specific embodiment, the longitudinal cross-sectional shape of the return channel 10207 is U-shaped. The U-shaped return channel 10207 can effectively guide and divert the incoming gas, prevent the gas from forming eddies inside the blower, thereby causing impact damage to the internal components of the blower, and reduce noise.

[0044] In one specific embodiment, a first guide plate 103 is provided on the left side adjacent to 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. This narrows the channel on the return channel 10207 near the exhaust port of the first stage impeller 20201, enabling precise diversion of the gas discharged from the first stage impeller 20201 and further reducing the noise of gas flow.

[0045] In one specific embodiment, the third return plate 10206 is located on the left side adjacent to the exhaust port of the secondary impeller 20202, and the second guide plate 104 is located on the right side adjacent to the exhaust port of the secondary impeller 20202. The second guide plate 104 is fixedly connected to the exhaust volute 10202, and an exhaust guide channel 6 is formed between the third return plate 10206 and the second guide plate 104. Through the exhaust guide channel 6, the gas discharged from the exhaust port of the secondary impeller 20202 can be guided and diverted, so that the gas can smoothly enter the exhaust channel 10208, avoid the generation of eddies, and thus reduce noise.

[0046] In one specific embodiment, a motor 7 is fixedly installed on the left side of the main shaft 201 along its axis. The main shaft 201 is driven to rotate by the motor 7. Since the motor is usually made of lightweight materials (such as aluminum alloy) while the electric motor is usually made of heavy materials (such as steel), the blower can be driven by the motor without affecting the working efficiency of the blower. This can reduce the overall weight of the blower, thereby reducing the load on the snowplow and further improving the snow removal efficiency of the snowplow.

[0047] In one specific embodiment, flanges 8 are fixedly provided on the outermost ports of the air intake channel 101018 and the exhaust channel 10208, respectively. The flanges 8 enable quick assembly and disassembly, thereby improving work efficiency.

[0048] In one specific embodiment, the exhaust channel 10208 has a rectangular cross-sectional shape, with a length of 75mm ± 5mm and a width of 32mm ± 5mm, resulting in a calculated cross-sectional area of ​​approximately 2400mm². Figure 1 The cross-sectional area of ​​the exhaust passage of the existing centrifugal blower shown is approximately 780 mm². By increasing the size of the exhaust passage 10208, the gas flow rate can be increased, enabling high-flow gas transmission and improving the snow removal efficiency of the snowplow.

[0049] In one specific embodiment, the outermost part of the exhaust channel 10208 is provided with an exhaust port 10203. The cross-sectional shape of the exhaust port 10203 is trapezoidal, which further increases the snow removal area during snow removal operations, realizes high-flow transmission, and improves the snow removal efficiency of the snow removal vehicle.

[0050] In one specific embodiment, the first reflux plate 10204, the second reflux plate 10205, and the third reflux plate 10206 are all fixed by welding. Specifically, the first reflux plate 10204 and the second reflux plate 10205 are fixed by welding through reflux blades 10, the second reflux plate 10205 is fixed by welding to the exhaust housing 102, and the third reflux plate 10206 is fixed by welding to the second reflux plate 10205.

[0051] pass Figure 1 , Figure 2 It can be seen that, compared with the existing return housing 10201, the return housing 10201 has a simpler structure. Furthermore, the first return plate 10204, the second return plate 10205, and the third return plate 10206 are all fixed by welding, resulting in low manufacturing cost and light weight. This further reduces the overall weight of the centrifugal blower, reduces the load on the snowplow, and improves the snow removal efficiency of the snowplow. In contrast, the return housings in most centrifugal blowers are currently cast, which have complex structures and heavy weights, further increasing the load on the snowplow and reducing its snow removal efficiency.

[0052] In a specific embodiment, the thickness of the first reflux plate 10204, the second reflux plate 10205, the third reflux plate 10206, the first guide plate 103, and the second guide plate 104 is all 1.5mm ± 0.2mm. This size range ensures that the plates do not vibrate during gas transmission, avoiding additional noise and fully meeting the normal gas transmission requirements. On the other hand, it minimizes the overall weight of the blower, achieving a lightweight effect.

[0053] The method for achieving gas transmission using a lightweight, high-flow-rate two-stage centrifugal blower in the aforementioned snowplow includes the following steps:

[0054] Step (1): Start the motor 7. The motor 7 drives the main shaft 201 to rotate. At the same time, the main shaft 201 rotates and 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 intake channel 10101.

[0055] Step (2): The gas entering the intake channel 10101 flows in a circumferential direction under the action of the volute structure of the intake volute 101 and enters the intake port located on the inner circumference of the first stage impeller 20201.

[0056] Step (3): The gas entering the inlet of the first-stage impeller 20201 diffuses outward in the direction of the centrifugal force generated by the rotation of the impeller and enters the exhaust port located on the outer circumference of the first-stage impeller 20201. Then, it enters the interior of the return channel 10207 through the exhaust port.

[0057] Step (4): The gas entering the return channel 10207 forms a regular flow under the U-shaped guidance of the return channel 10207, avoiding the formation of vortex at the exhaust port of the first-stage impeller 20201. Then the gas enters the intake port of the second-stage impeller 20202.

[0058] Step (5): The gas entering the inlet of the secondary impeller 20202 diffuses outward in a circumferential direction under the centrifugal force generated by the impeller rotation, enters the exhaust port of the secondary impeller 20202, and then enters the interior of the exhaust guide channel 6 through the exhaust port. At this time, the exhaust guide channel 6 guides the incoming gas, preventing the gas discharged from the exhaust port of the secondary impeller 20202 from forming a vortex at the exhaust port position. Subsequently, the gas enters the interior of the exhaust channel 10208 through the exhaust guide channel 6. At this time, the gas forms a circumferential flow under the action of the volute structure of the exhaust volute 10202, and finally is discharged outward through the exhaust channel 10208, completing the gas transmission.

[0059] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A light-weight large-flow two-stage centrifugal blower for a snowplow, characterized by: It includes a stator assembly and a rotor assembly, wherein 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, which are axially fixedly connected. The intake volute has an intake channel inside, and the exhaust housing has a return housing and an exhaust volute fixedly connected inside. The reflux housing includes a first reflux plate, a second reflux plate, and a third reflux plate. The first reflux plate is located to the left of the second reflux plate, and the third reflux plate is located to the right of the second reflux plate. The first reflux plate, the second reflux plate, and the third reflux plate are axially fixedly connected in sequence. The second reflux plate is fixedly connected to the exhaust housing. A reflux channel is formed between the first reflux plate, the second reflux plate, and the intake volute. The rotor assembly includes a main shaft and an impeller. The impeller is fixedly mounted on the outer circumference of the main shaft. The impeller includes a primary impeller and a secondary impeller, which are arranged axially on the outer circumference of the main shaft. The reflux housing is located between the primary impeller and the secondary impeller. The air inlet of the primary impeller is connected to the exhaust port of the air inlet volute. The exhaust port of the primary impeller is connected to one side port of the reflux channel. The other side port of the reflux channel is connected to the air inlet of the secondary impeller. The exhaust port of the secondary impeller is connected to the air inlet of the exhaust volute. The outer circumference of the main shaft is located inside the intake volute and is provided with a sealing bushing and an intake side end cover from the inside out. The inner circumference of the sealing bushing and the outer circumference of the main shaft rotate and seal against each other. The outer circumference of the sealing bushing is fixedly connected to one side of the intake side end cover, and the other side of the intake side end cover is fixedly connected to the axial outer side of the intake volute. After the intake side end cover is fixedly connected to the intake volute, a complete intake channel is formed inside the intake volute. A bearing is provided between the main shaft and the air intake side end cover, located outside the sealing bushing. 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 intake side end cover. The outer circumference of the main shaft is located inside the exhaust volute and is provided with a sealing bushing and an exhaust-side second end cover from the inside out. The inner circumference of the sealing bushing and the outer circumference of the main shaft rotate and seal against each other. The outer side of the sealing bushing 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 channel is formed inside the exhaust volute. The exhaust side second end cover is fixedly provided with the exhaust side first end cover on the outer side of the main shaft at the outer circumference position. The inner circumference of the exhaust side first end cover is axially sealed with the outer circumference of the main shaft. A bearing is provided between the inner circumference of the exhaust side first end cover 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 exhaust side first end cover. A motor is fixedly installed on the left side of the spindle, and the spindle is driven to rotate by the motor.

2. The light-weight large-flow two-stage centrifugal blower for a snowplow according to claim 1, characterized by: The longitudinal cross-sectional shape of the return channel is U-shaped.

3. The light-weight large-flow two-stage centrifugal blower for a snowplow according to claim 2, characterized by: A first guide plate is provided on the left side adjacent to the exhaust port of the first stage impeller. One end of the first guide plate is fixedly connected to the intake volute, and the other end of the first guide plate is fixedly connected to the exhaust housing.

4. The light-weight large-flow two-stage centrifugal blower for a snowplow according to claim 3, characterized by: The third return plate is located on the left side adjacent to the exhaust port of the second-stage impeller, and a second guide plate is provided on the right side adjacent to the exhaust port of the second-stage impeller. The second guide plate is fixedly connected to the exhaust volute. An exhaust guide channel is formed between the third return plate and the second guide plate.

5. The light-weight large-flow two-stage centrifugal blower for a snowplow according to claim 1, characterized by: Flanges are fixedly installed on the outermost ports of the air intake channel and the air exhaust channel, respectively.

6. The lightweight, high-flow-rate, two-stage centrifugal blower for snow removal vehicles according to claim 5, characterized in that: The exhaust channel has a rectangular cross-sectional shape, with a length of 75mm ± 5mm and a width of 32mm ± 5mm.

7. The lightweight, high-flow-rate, two-stage centrifugal blower for snow removal vehicles according to claim 6, characterized in that: The outermost part of the exhaust channel is provided with an exhaust port, and the cross-sectional shape of the exhaust port is trapezoidal.

8. The light-weight large-flow dual-stage centrifugal blower for snowploughs according to any of claims 1-7, characterized in that: The first reflux plate and the second reflux plate are fixed together by welding reflux blades, the second reflux plate is fixed together with the exhaust housing by welding, and the third reflux plate is fixed together with the second reflux plate by welding.

Images