Roots blower, pneumatic suction system and vehicle

Abstract

The present application relates to the field of fan, especially to Roots blower, pneumatic suction system and vehicle, comprising: shell and rotor; base, including base one and base two, front end cover, connected with base one, and form first cavity with base one, rear end cover, connected with base two, and form second cavity with base two, the rotor is internally provided with weight reduction cavity one and cavity two; the inside of base one and base two is provided with cooling channel for cooling. By setting base and end cover, forming first cavity and second cavity, and not communicating with rotor cavity, and setting cooling channel in base to cool the structure in each cavity, reducing the thermal expansion generated by each component when running at high speed, providing necessary guarantee for single machine operation still having high strength negative pressure; support assembly is respectively located at both ends of the rotor, improving the stability of the rotor, setting cavity one and cavity two on the rotor, which can realize the lightweight of the rotor, and ensure that the fan can run at high speed.

Description

Technical Field

[0001] This invention relates to the field of blowers, and more particularly to Roots blowers, pneumatic suction systems, and vehicles. Background Technology

[0002] Some sludge suction vehicles are equipped with multi-stage centrifugal fans to provide a negative pressure environment for the casing. However, the system resistance fluctuates greatly during the process of sludge suction and discharge. The operating conditions of the centrifugal fan will deviate due to the change in resistance. When the operating conditions deviate significantly, it can easily cause dangerous conditions such as overload and surge. In contrast, the operating conditions of the Roots blower are more stable and are not affected by the system resistance.

[0003] The application of Roots blowers in relevant vehicle pneumatic suction systems is relatively limited, making it difficult to ensure both small size and lightweight design while providing high-intensity negative pressure without the aid of other auxiliary devices. Summary of the Invention

[0004] The purpose of this invention is to provide a Roots blower, a pneumatic suction system and a vehicle, which have a compact structure, achieve lightweight device, and at the same time have high-intensity negative pressure when operating alone.

[0005] To solve the above technical problems, the following technical solution is adopted:

[0006] In a first aspect, the present invention provides a Roots blower, wherein the rotor is installed in a rotor cavity inside a housing and rotates within the rotor cavity, and further includes:

[0007] The base includes base one and base two, which are respectively installed at both ends of the shell;

[0008] The front end cover is connected to the base and forms a first cavity with the base. The first cavity is used to install the transmission assembly and the support assembly. The transmission assembly is used to transmit torque to the rotor, and the support assembly is used to support one end of the rotor.

[0009] The rear end cover is connected to the second base and forms a second cavity with the second base. The second cavity is used to install the second support assembly; the second support assembly is used to support the other end of the rotor.

[0010] The rotor cavity, the first cavity, and the second cavity are independent of each other;

[0011] The rotor has two internal weight-reduction cavities: cavity one and cavity two.

[0012] Both the first base and the second base are provided with cooling channels inside for cooling.

[0013] Optionally, the transmission assembly includes a driving gear and a driven gear, and the rotor includes a driving rotor and a driven rotor. The driving gear is mounted on one end of the driving rotor located in the first cavity, and the driven gear is mounted on one end of the driven rotor located in the first cavity. The driving gear meshes with the driven gear. The driving rotor is connected to an input shaft, and the input shaft extends from the front end cover and is connected to a power device. The driving gear is close to the power device, shortening the distance that the power device transmits torque to the driving gear.

[0014] Optionally, the driving rotor and the driven rotor are arranged vertically or horizontally within the rotor cavity.

[0015] Optionally, the first support assembly includes a first bearing and a second bearing. The first bearing is installed between the input shaft and the front end cover, and the second bearing is installed between the rotor and the first base. The second support assembly includes a third bearing, which is installed between the rotor and the second base. With the first and second bearings on both sides of the drive gear, the operation is highly stable.

[0016] Optionally, two oil slingers for auxiliary lubrication are respectively installed at both ends of the active rotor, with the first oil slinger located in the first cavity and the second oil slinger located in the second cavity.

[0017] Optionally, a sealing structure is also provided between the input shaft and the front end cover. The sealing structure includes a sealing bushing, an O-ring, and an oil seal. Two O-rings are provided, which are spaced apart on the inner side of the sealing bushing, and the oil seal is provided on the outer side of the sealing bushing.

[0018] Optionally, a sealing structure is provided between the rotor and the first base and the second base. The sealing structure includes a second sealing bushing, an O-ring, an oil seal, and a sealing ring. Two O-rings are provided, which are spaced apart on the inner side of the second sealing bushing. The oil seal and the sealing ring are spaced apart on the outer side of the second sealing bushing.

[0019] Optionally, the cooling channel includes an air inlet, an exhaust outlet, and an airflow channel. The air inlet is located on the outside of the base one or base two, and the exhaust outlet is located on the end face of the base one or base two where it is mounted to the housing. The exhaust outlet communicates with the interior of the housing.

[0020] Optionally, the rotor has a three-lobe structure, installed inside the rotor cavity, dividing the area inside the rotor cavity into an air inlet zone, a sealing zone, and an exhaust zone. The air inlet zone is connected to an air inlet pipe, and the exhaust zone is connected to an air outlet pipe. The exhaust port of the cooling channel is located on the sealing zone. After cooling the structure on the base through the airflow channel, the cooling gas enters the sealing zone from the exhaust port and is discharged through the rotor. The sealing zone is not connected to the air inlet and outlet ports on the housing, so it will not affect the internal airflow. Moreover, the sealing zone is connected to the airflow channel, and the cooling gas is drawn out and discharged by the negative pressure in the sealing zone. There is no need to connect to equipment for processing cooling gas, and the structure is compact.

[0021] The air inlet pipe and the air outlet pipe are connected to the housing via a multi-lobed flange, the outer side of which is divided into at least four lobes.

[0022] Optionally, the rotor structure includes an impeller and a shaft. The shaft is mounted at both ends of the impeller and is located on the axis of the impeller. The impeller is a three-bladed structure with a smooth transition between the blades. The blade shape is composed of multiple segments of arc and involute curves. Through holes are provided on the blades, penetrating both ends. The two openings of the through holes are sealed by plugs. A cavity one is formed inside the through holes. A cavity two is provided inside the smooth transition connection area between the blades. Cavities one and two are interconnected, and there are three of each cavity. Cavities one and two are symmetrically distributed at 120° on the central axis of the blades.

[0023] Secondly, the present invention also provides a pneumatic suction system employing the Roots blower described in the first aspect.

[0024] Thirdly, the present invention also provides a vehicle employing the pneumatic suction system described in the second aspect.

[0025] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0026] 1. The Roots blower provided by this invention forms a first cavity and a second cavity by setting a base and end caps, which are not connected to the rotor cavity. The structures inside each cavity do not affect each other. Cooling channels are set in the base to cool the structures inside each cavity, so as to achieve timely and effective heat dissipation and ensure the continuous working time of key components at high speeds. The support components are located at both ends of the rotor to improve the stability of the rotor. The first cavity and the second cavity are set on the rotor, which can achieve both rotor weight reduction and ensure that the blower can operate at high speeds.

[0027] 2. The Roots blower provided by the present invention has a cooling channel in the base. The exhaust port of the cooling channel is connected to the sealing area in the rotor cavity. After passing through the airflow channel, the cooling gas is discharged from the exhaust port and enters the rotor cavity. The gas is discharged through the rotor and enters the sealing area of ​​the rotor cavity without affecting the airflow operation of the rotor in the rotor cavity.

[0028] 3. The Roots blower provided by this invention has a sealing structure at the shaft mounting points of the input shaft and the rotor. The sealing structure includes a sealing bushing, an oil seal, an O-ring, and a sealing ring, achieving a triple sealing structure to ensure the sealing performance between the structures. The Roots blower of this invention has bearing one and bearing two at both ends of the drive gear. The drive gear is located in the first cavity close to the power unit. During operation, the distance for transmitting torque is small, the stability is strong, and it has the ability to operate at high speed, ensuring high negative pressure when the unit is running. Attached Figure Description

[0029] Figure 1 This is a front view schematic diagram of the Roots blower in an embodiment of the present invention;

[0030] Figure 2 This is a side view cross-sectional structural schematic diagram of the Roots blower in an embodiment of the present invention;

[0031] Figure 3 This is a front cross-sectional view of the Roots blower in an embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of the sealing structure between the input shaft and the front cover in an embodiment of the present invention;

[0033] Figure 5 This is a schematic diagram of the sealing structure between the rotor and the base in an embodiment of the present invention;

[0034] Figure 6 This is a schematic diagram of the cooling channel structure in an embodiment of the present invention;

[0035] Figure 7 This is a schematic diagram of the airflow path of the cooling channel in an embodiment of the present invention;

[0036] Figure 8 This is a schematic diagram of the rotor structure in an embodiment of the present invention;

[0037] Figure 9 This is a schematic diagram of the rotor cross-sectional structure in an embodiment of the present invention;

[0038] Figure 10 This is a schematic diagram of the multi-lobed flange structure in an embodiment of the present invention;

[0039] Figure 11 This is one of the schematic diagrams of a rotor arrangement in an embodiment of the present invention;

[0040] Figure 12 This is a second schematic diagram of one arrangement of the rotor in an embodiment of the present invention;

[0041] Figure 13 This is a third schematic diagram of one arrangement of the rotor in an embodiment of the present invention;

[0042] Figure 14 This is the fourth schematic diagram of one arrangement of the rotor in an embodiment of the present invention.

[0043] Explanation of reference numerals in the attached figures:

[0044] 1. Housing; 101. Rotor cavity; 102. Multi-lobed flange; 103. Inlet area; 104. Sealing area; 105. Exhaust area;

[0045] 2. Rotor; 201. Driving rotor; 202. Driven rotor; 203. Impeller; 204. Shaft; 205. Cavity 1; 206. Cavity 2;

[0046] 3. Front cover; 301. First cavity; 302. Input shaft; 303. Bearing 1; 304. Bearing 2; 305. Oil slinger 1; 306. Drive gear; 307. Driven gear;

[0047] 4. Rear end cover; 401. Second cavity; 402. Oil slinger plate two; 403. Bearing three;

[0048] 5. Base; 501. Base One; 502. Base Two; 503. Cooling Channel; 504. Air Inlet; 505. Airflow Channel; 506. Exhaust Port;

[0049] 6. Sealing structure; 601. Sealing sleeve one; 602. Sealing sleeve two; 603. O-ring; 604. Oil seal; 605. Sealing ring. Detailed Implementation

[0050] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use.

[0051] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0052] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0053] At least one embodiment provides a Roots blower, including a rotor 2, a housing 1, a base 5, a front cover 3, and a rear cover 4. The rotor 2 is installed in a rotor cavity 101 inside the housing 1, and the two rotors 2 rotate in the rotor cavity 101 to realize gas delivery. The base 5 includes a base one 501 and a base two 502, which are respectively installed at both ends of the housing 1. The base one 501 is installed together with the front cover 3, and the base two 502 is installed together with the rear cover 4. A first cavity 301 is formed between the base one 501 and the front cover 3, and a second cavity 401 is formed between the base two 502 and the rear cover 4.

[0054] The first cavity 301 houses a transmission assembly and a first support assembly. The transmission assembly connects the rotor 2 and the input shaft 302. The input shaft 302 is connected to a power unit, which drives the input shaft 302 to rotate. The input shaft 302 transmits torque to the rotor 2 through the transmission assembly. The second cavity 401 houses a second support assembly. The first support assembly supports one end of the rotor 2, and the second support assembly supports the other end of the rotor 2, thus providing stable support for the rotor 2.

[0055] The rotor cavity 101, the first cavity 301, and the second cavity 401 are independent of each other and not connected, so that the operation of the structures in each cavity does not interfere with each other, and the rotor cavity can operate under high-intensity negative pressure, thus achieving high-intensity stable operation of the device.

[0056] Cavity 1 205 and Cavity 2 206 are provided inside rotor 2. Both cavity 1 205 and cavity 2 206 are internal cavities. By removing some of the material inside rotor 2, the rotor 2 can be made lighter, while ensuring that the fan can operate at high speed.

[0057] Cooling channels 503 are provided inside both base 1 501 and base 2 502. Cooling channels 503 are connected to cooling gas through pipes. Cooling gas enters base 1 501 and base 2 502 to cool the transmission assembly, support assembly 1 and support assembly 2.

[0058] The Roots blower provided in this embodiment has support components one and two at both ends of the rotor 2, so that both ends of the rotor 2 are supported, enabling stable operation. Cavity one 205 and cavity two 206 are set inside the rotor 2 to achieve lightweighting of the device. The end cover and the base 5 form independent cavities, so that the operation of each structure does not affect each other, making the device more stable and efficient in operation.

[0059] like Figure 1 , Figure 2 , Figure 3 , Figure 8 As shown, in some embodiments, the rotor 2 of the Roots blower includes a driving rotor 201 and a driven rotor 202. The driving rotor 201 and driven rotor 202 adopt the same structure, both including an impeller 203 and a shaft 204. The shaft 204 is mounted at both ends of the impeller 203. In this embodiment, the impeller 203 is a three-bladed structure with smoothly transitioned blades. The three blades on the impeller 203 divide the rotor cavity 101 into an intake zone 103, a sealing zone 104, and an exhaust zone 105. Assuming one rotor 2 rotates counterclockwise and the other rotor 2 rotates clockwise, the intake zone 103, sealing zone 104, and exhaust zone 105 are as follows... Figure 2 The arrangement is shown.

[0060] like Figure 1 , Figure 2 , Figure 3As shown, the shafts 204 at both ends of the active rotor 201 and the driven rotor 202 pass through the bases 5 at both ends of the housing 1 and are located in the first cavity 301 and the second cavity 401, respectively. Specifically, mounting holes for installing the active rotor 201 and the driven rotor 202 are provided on the first base 501. Similarly, mounting holes for installing the active rotor 201 and the driven rotor 202 are provided on the second base 502. The shaft 204 at one end of the active rotor 201 engages with the corresponding mounting hole on the first base 501 through a second bearing 304, and the shaft 204 at the other end engages with the corresponding mounting hole on the second base 502 through a third bearing 403. The shaft 204 at one end of the driven rotor 202 engages with the corresponding mounting hole on the first base 501 through a second bearing 304, and the shaft 204 at the other end engages with the corresponding mounting hole on the second base 502 through a third bearing 403. The front cover 3 has a mounting hole for mounting the input shaft 302. The input shaft 302 is engaged with the mounting hole on the front cover 3 through a bearing 303. The input shaft 302 extends into the first cavity 301 and is connected to the rotating shaft 204 on the active rotor 201. The connection method can be a coupling, so that the input shaft 302 drives the active rotor 201 to rotate.

[0061] like Figure 1 , Figure 3 As shown, the transmission device includes a driving gear 306 and a driven gear 307. The driving gear 306 is mounted on the shaft 204 of the driving rotor 201 located in the first cavity 301. The driving gear 306 meshes with the driven gear 307, which is mounted on the shaft 204 of the driven rotor 202 located in the first cavity 301. The input shaft 302 drives the driving rotor 201 to rotate, and the driving gear 306 on the driving rotor 201 also rotates accordingly. The driving gear 306 then drives the driven gear 307 to rotate, and the driven gear 307 drives the driven rotor 202 to rotate, thus realizing that the driving rotor 201 and the driven rotor 202 rotate together. The input shaft 302 extends from the front end cover 3 and connects to the power device. The driving gear 306 is close to the power device, shortening the distance that the power device transmits torque to the driving gear 306. The driving gear 306 has bearing 303 and bearing 304 on both sides, and both sides are supported. Both the driving rotor 201 and the driven rotor 202 are equipped with bearings at both ends. The forces on both are basically the same, resulting in high operational stability.

[0062] like Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6As shown, lubricating oil is stored in the first cavity 301, and the input shaft 302 extends out from the front cover 3. To prevent leakage of lubricating oil, a sealing structure 6 is provided between the input shaft 302 and the front cover 3. The sealing structure 6 includes a sealing bushing 601, two O-rings and an oil seal 604. The sealing bushing 601 is fitted on the input shaft 302, the two O-rings are arranged at intervals on the inner side of the sealing bushing 601, and the oil seal 604 is installed on the outer side of the sealing bushing 601 to ensure good sealing in the first cavity 301.

[0063] Since the shafts 204 of both the driven rotor 202 and the driving rotor 201 need to pass through the base 1 501 and the base 2 502, a sealing structure 6 is also provided between the shaft 204 of the rotor 2 and the base 5 to prevent the sealing of the first cavity 301, the second cavity 401 and the rotor cavity 101. The sealing structure 6 includes a sealing bushing 2 602, two O-rings 603, two sealing rings 605 and an oil seal 604. The sealing bushing 2 602 is fitted on the shaft 204 of the rotor 2. The two O-rings 603 are arranged at intervals on the inner side of the sealing bushing 2 602. The two sealing rings 605 are arranged at intervals on the outer side of the sealing bushing 2 602. The oil seal 604 is also provided on the outer side of the sealing bushing 2 602, forming a triple sealing structure 6 to ensure good sealing between the first cavity 301, the rotor cavity 101 and the second cavity 401. Oil slinger 1 305 and oil slinger 2 402 are respectively provided in the first cavity 301 and the second cavity 401 to assist in the lubrication of the internal structure. Oil slinger 1 305 is installed on the rotating shaft 204 of the active rotor 201 between the active gear 306 and the bearing 2 304. Oil slinger 2 402 is installed on the rotating shaft 204 at the other end of the active rotor 201 to ensure lubrication.

[0064] In some embodiments, the sealing structure 6 is not limited to the structure described above and in the figure. O-rings 603 can be provided by slotting on the corresponding shaft. The number of O-rings 603 and sealing rings 605 is determined according to the structure, and the sealing shaft sleeve structure changes accordingly.

[0065] like Figure 3 , Figure 6 , Figure 7As shown, cooling channels 503 for passing cooling gas are provided inside both base 1 501 and base 2 502. Cooling channels 503 include air inlets 504, airflow channels 505, and exhaust ports 506. Air inlets 504 are located on the outside of base 1 501 or base 2 502. Air inlets 504 are connected to a cooling device through pipes. The cooling gas in the cooling device enters the airflow channel 505 through air inlets 504 to cool the bearings, sealing components, etc. on base 1 501 or base 2 502, and then exits from exhaust ports 506. Exhaust ports 506 are located on the end face where base 5 is connected to housing 1. Exhaust ports 506 are connected to rotor chamber 101 and are located on the sealing area 104 of rotor chamber 101. Cooling gas enters the sealing area 104 from exhaust ports 506 and is discharged through the rotating rotor 2. The sealed area 104 is not connected to the air inlet and outlet ports on the housing 1. After the cooling gas flows into the sealed area 104, it will not cause adverse disturbance to the flow of the air inlet and outlet ports. Finally, the cooling gas is discharged from the air outlet port of the housing 1 as the rotor 2 rotates. Since the base 5 is connected to the sealed area 104 in the rotor cavity 101, the cooling system is naturally drawn in by the negative pressure in the sealed area 104 and discharged by the rotation of the rotor 2. No additional pressurization equipment is required for auxiliary delivery, which can save the space occupied by the cooling system.

[0066] In this embodiment, to meet the requirements for lightweight device design, such as... Figure 1 , Figure 8 , Figure 9 , Figure 10 As shown, the blade shape of the blades on rotor 2 is composed of a combination of arcs and involute curves. Each blade of impeller 203 has a through-hole penetrating both ends. The openings of the through-holes at both ends are sealed with plugs, forming a cavity 205 inside the through-hole. A cavity 206 is also provided inside the smoothly transitioning connecting area between the blades. Cavities 205 and 206 are interconnected, and there are three of each type. The three cavities 205 and 206 are symmetrically arranged at 120° along the central axis of the blades. The reduced mass of rotor 2 leads to a decrease in the power consumption of the device, improved operating efficiency, and the ability to operate at high speeds while maintaining a small size and high negative pressure. An air inlet and outlet are provided on the side wall of the housing 1, penetrating into the rotor cavity 101. The air inlet area 103 within the rotor cavity 101 communicates with the air inlet, and the exhaust area 105 communicates with the air outlet. An intake pipe is installed around the outer periphery of the air inlet via a flange, and an exhaust pipe is installed around the outer periphery of the air outlet via a flange. In this embodiment, a multi-lobed flange 102 is used. The outer side of the multi-lobed flange 102 has a raised-recessed structure with four grooves recessed towards the center. Using the multi-lobed flange 102 satisfies both installation strength requirements and reduces the overall weight of the machine. Furthermore, in this embodiment, the materials of some components are optimized; for components with lower strength requirements, lighter materials such as aluminum alloy are used.

[0067] In some embodiments, the arrangement of the driving rotor 201 and the driven rotor 202 within the housing 1 varies according to usage requirements. Figure 11 , Figure 12 , Figure 13 , Figure 14 As shown, the arrangement of the active rotor 201 and the driven rotor 202 includes the following four methods: 1. The axes of the two rotors 2 are vertical, and the active rotor 201 is located below the driven rotor 202. 2. The axes of the two rotors 2 are vertical, and the active rotor 201 is located above the driven rotor 202. Both of these arrangements can achieve gas transport methods of left-side intake and right-side exhaust or right-side intake and left-side exhaust. When the base 5 is assembled, it can rotate 180° around the central axis of the fan to achieve left or right side intake of cooling gas. 3. The axes of the two rotors 2 are horizontal, and the active rotor 201 is located to the left of the driven rotor 202. 4. The axes of the two rotors 2 are horizontal, and the active rotor 201 is located to the right of the driven rotor 202. Both of these arrangements can achieve top-intake and bottom-exhaust or bottom-intake and top-exhaust gas transport methods, and can also achieve intake of cooling gas from top or bottom.

[0068] At least one embodiment also provides a pneumatic suction system, which employs the Roots blower described in the above embodiments, and features a lightweight structure, low power consumption, and stable operation.

[0069] At least one embodiment also provides a vehicle equipped with the Roots blower described in the above embodiments, which provides negative pressure to the housing to achieve the suction of sludge, and has a lightweight structure.

[0070] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A Roots blower, characterized in that, include: Shell (1); Rotor (2), which is installed in a rotor cavity (101) inside the housing (1) and rotates within the rotor cavity (101), The base (5) includes base one (501) and base two (502), which are respectively installed at both ends of the shell (1); The front end cover (3) is connected to the base (501) and forms a first cavity (301) with the base (501). The first cavity (301) is used to install the transmission assembly and the support assembly. The transmission assembly is used to transmit torque to the rotor (2), and the support assembly is used to support one end of the rotor (2). The rear end cover (4) is connected to the second base (502) and forms a second cavity (401) with the second base (502). The second cavity (401) is used to install the second support assembly; the second support assembly is used to support the other end of the rotor (2). The rotor cavity (101), the first cavity (301), and the second cavity (401) are independent of each other; The rotor (2) has a first cavity (205) and a second cavity (206) for weight reduction inside. Both the base one (501) and the base two (502) are provided with cooling channels (503) for cooling. The transmission assembly includes a drive gear (306) and a driven gear (307). The rotor (2) includes a drive rotor (201) and a driven rotor (202). The drive gear (306) is mounted on one end of the drive rotor (201) located in the first cavity (301). The driven gear (307) is mounted on one end of the driven rotor (202) located in the first cavity (301). The drive gear (306) meshes with the driven gear (307). The drive rotor (201) is connected to the input shaft (302). The input shaft (302) extends from the front end cover (3) and is connected to the power unit. The active rotor (201) and the driven rotor (202) are arranged vertically or horizontally within the rotor cavity (101); The first support assembly includes a first bearing (303) and a second bearing (304). The first bearing (303) is installed between the input shaft (302) and the front end cover (3). The second bearing (304) is installed between the rotor (2) and the first base (501). The second support assembly includes a third bearing (403). The third bearing (403) is installed between the rotor (2) and the second base (502). The active rotor (201) is equipped with an oil slinger plate 1 (305) and an oil slinger plate 2 (402) for auxiliary lubrication at both ends. The oil slinger plate 1 (305) is located in the first cavity (301), and the oil slinger plate 2 (402) is located in the second cavity (401). A sealing structure (6) is also provided between the input shaft (302) and the front cover (3). The sealing structure (6) includes a sealing bushing (601), an O-ring (603), and an oil seal (604). There are two O-rings (603), which are spaced apart on the inner side of the sealing bushing (601), and the oil seal (604) is located on the outer side of the sealing bushing (601).

2. The Roots blower according to claim 1, characterized in that, A sealing structure (6) is provided between the rotor (2) and the base one (501) and the base two (502). The sealing structure (6) includes a sealing bushing two (602), an O-ring (603), an oil seal (604), and a sealing ring (605). There are two O-rings (603), which are spaced apart on the inner side of the sealing bushing two (602). The oil seal (604) and the sealing ring (605) are spaced apart on the outer side of the sealing bushing two (602).

3. The Roots blower according to claim 1, characterized in that, The cooling channel (503) includes an air inlet (504), an exhaust port (506), and an airflow channel (505). The air inlet (504) is located on the outside of the base one (501) or the base two (502). The exhaust port (506) is located on the end face of the base one (501) or the base two (502) where it is mounted to the housing (1). The exhaust port (506) communicates with the inside of the housing (1).

4. The Roots blower according to claim 3, characterized in that, The rotor (2) has a three-lobe structure and is installed in the rotor cavity (101). The area inside the rotor cavity (101) is divided into an air intake area (103), a sealing area (104), and an exhaust area (105). The air intake area (103) is connected to the air intake pipe on the housing (1), and the exhaust area (105) is connected to the air outlet pipe on the housing (1). The exhaust port (506) of the cooling channel (503) is located on the sealing area (104). The air inlet pipe and the air outlet pipe are connected to the housing (1) via a multi-lobed flange (102), and the outer side of the multi-lobed flange (102) is divided into at least four lobes.

5. The Roots blower according to claim 1, characterized in that, The rotor (2) includes an impeller (203) and a shaft (204). The shaft (204) is installed at both ends of the impeller (203) and is located on the axis of the impeller (203). The impeller (203) is a three-bladed structure with a smooth transition between the blades. The blade shape is composed of multiple curves of arc and involute. Through holes are opened on the blades, penetrating both ends. The two ends of the blades are sealed by plugs. A cavity one is formed inside the through hole. A cavity two (206) is set inside the smooth transition connection area between the blades. Cavities one (205) and two (206) are interconnected and each has three cavities. The three cavities one (205) and three cavities two (206) are symmetrically distributed at 120° on the central axis of the blades.

6. A pneumatic suction system, characterized in that, The Roots blower as described in any one of claims 1-5 is used.

7. A vehicle, characterized in that, The pneumatic suction system as described in claim 6 is used.

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