Multi-stage assembled roots blower

Abstract

This invention provides a multi-stage assembled Roots blower, comprising a casing assembly, impeller assembly, endplates, oil tank, transmission assembly, and cooling assembly. Both the casing and impeller assemblies are multi-stage series-mounted structures. The cooling assembly is a combined circulating cooling structure. The casing assembly has a complete airflow transmission channel inside, and the cooling assembly consists of multiple cooling units, each providing circulating cooling for a different area within the multi-stage assembled Roots blower. The multi-stage combined assembly structure of the casing and impellers allows for the selection and assembly of different numbers of casings and impellers to meet varying flow rate requirements. This invention can be widely applied to Roots blowers.

Description

Technical Field

[0001] This invention relates to a Roots blower, and more particularly to a multi-stage assembled Roots blower. Background Technology

[0002] Roots blowers are positive displacement blowers that achieve gas compression and delivery through the relative motion of two involute rotors within a cylinder. Their core features include forced gas delivery, stable flow rate, compact structure, and low operating vibration, making them widely used in wastewater treatment, aquaculture, petrochemicals, and other fields.

[0003] Depending on the different flow requirements of customers, the same model of blower often needs to be manufactured in multiple different length specifications. By simultaneously changing the length of the outer casing and the impeller, the compression amount when the impeller rotates in the cavity inside the outer casing is changed. However, this will result in an excessive inventory of blowers of the same model but different specifications, and high cost.

[0004] Furthermore, during long-term operation, the temperature inside the blower casing will rise significantly, leading to accelerated aging of related components. Therefore, how to achieve efficient cooling of blowers has always been a concern in the industry. Summary of the Invention

[0005] To address the above-mentioned technical problems, this invention provides a multi-stage assembled Roots blower. The casing and impeller of this Roots blower are both multi-stage assembled structures. Different numbers of casings and impellers can be assembled according to different flow rate requirements, thereby changing the compression amount when the impeller rotates in the cavity inside the outer casing, ultimately meeting the different flow rate requirements. This avoids the problem of excessive inventory and high cost of blowers of the same model but different specifications.

[0006] Furthermore, the blower is equipped with a circulating cooling device, which enables efficient circulating cooling during operation, greatly shortening the aging rate of related components and extending the service life of the blower.

[0007] Therefore, the technical solution of the present invention is a multi-stage assembled Roots blower, including a casing assembly, an impeller assembly, a wall panel, an oil tank, a transmission assembly, and a cooling assembly. The casing assembly and the impeller assembly are both multi-stage series installation structures, and the cooling assembly is a combined circulating cooling structure.

[0008] The housing assembly includes housing units and partitions. There are multiple housing units. Each housing unit has a first air inlet and a first air outlet at its top and bottom, respectively. The interior of the first air inlet and the first air outlet on each housing unit are connected to the inner cavity of the corresponding housing unit.

[0009] Multiple housing units are connected in series, and adjacent housing units are sealed and fixedly connected by partitions. After multiple housing units are sealed and fixedly connected with partitions, they form a housing assembly. The housing assembly has a complete airflow transmission channel inside. During gas transmission, only the first air inlet at the top of the frontmost housing unit and the first air outlet at the bottom of the rearmost housing unit are kept open. The other first air inlets and first air outlets are blocked. Gas can enter from the first air inlet on the frontmost housing unit, pass through the airflow transmission channel, and exit from the first air outlet on the rearmost housing unit, thus completing the complete gas transmission process.

[0010] The impeller assembly is located inside the housing assembly and can rotate inside the housing assembly. The wall plates are located on the front and rear sides of the housing assembly and are sealed and fixedly connected to the front and rear sides of the housing assembly respectively. The oil tank is located on the outside of the two wall plates and is sealed and fixedly connected to the two wall plates respectively.

[0011] The cooling assembly consists of multiple cooling units, each of which is an independent circulating cooling structure. The multiple cooling units respectively circulate cooling and temperature reduction for different areas inside the multi-stage assembled Roots blower.

[0012] The impeller assembly includes an inlet impeller shaft, an impeller, an outlet impeller shaft, and an impeller connecting column. There are multiple impellers connected in series, and adjacent impellers are fixedly connected by the impeller connecting column.

[0013] The impeller consists of a first-stage impeller, a second-stage impeller, and a third-stage impeller. The first-stage impeller is located at the front end, the second-stage impeller is located in the middle, and the third-stage impeller is located at the rear end. Each of the first-stage, second-stage, and third-stage impellers has an axially penetrating mounting hole in the middle. The rear end of the inlet impeller shaft is fixedly connected to the front end of the mounting hole on the first-stage impeller. The first-stage impeller and the second-stage impeller, as well as the second-stage impeller and the third-stage impeller, are fixedly connected to the mounting holes on adjacent impellers through impeller connecting columns, thereby achieving sequential locking and fixing of the first-stage, second-stage, and third-stage impellers. The rear end of the mounting hole on the third-stage impeller is fixedly connected to the front end of the outlet impeller shaft.

[0014] The three-stage impeller assembly is achieved by connecting and fixing the inlet impeller shaft, the first-stage impeller, the second-stage impeller, the third-stage impeller, and the outlet impeller shaft in series with impeller connecting columns.

[0015] The first-stage impeller, second-stage impeller, and third-stage impeller have the same width as the first-stage casing, second-stage casing, and third-stage casing, respectively, and can be used together to ultimately achieve the assembly of a three-stage Roots blower;

[0016] Each housing unit employs a combined cooling method of counter-current air cooling and liquid cooling, with the counter-current air cooling channel and the liquid cooling channel being independent and isolated from each other.

[0017] The interior of the oil tank uses a circulating liquid cooling method. The cooling channel of the circulating liquid cooling is an independent channel, which is isolated from the cooling channel on the housing unit.

[0018] The cooling system consists of a counter-current air cooling unit, a circulating liquid cooling unit, and a direct injection liquid cooling unit;

[0019] Preferably, the housing unit consists of a primary housing, a secondary housing, and a tertiary housing. The primary housing is located at the front end, the secondary housing is located in the middle, and the tertiary housing is located at the rear end. The widths of the primary housing, the secondary housing, and the tertiary housing are arranged sequentially from widest to narrowest. The first air inlet and the first air outlet are located at the top and bottom ends of the primary housing, the secondary housing, and the tertiary housing, respectively. The interior of the first air inlet and the first air outlet on each housing communicate with the inner cavity of the corresponding housing. The primary housing and the secondary housing, as well as the secondary housing and the tertiary housing, are sealed and fixedly connected by partitions.

[0020] A second air outlet is located on the rear side near the bottom of the first-stage casing. A fourth air inlet is located on the front side near the top of the second-stage casing. A fifth air outlet is located on the rear side near the bottom of the second-stage casing. A fifth air inlet is located on the front side near the top of the third-stage casing. An airflow channel is provided inside the partition, with both ends extending to near the top and bottom of the partition, respectively. A third air inlet and a third air outlet are located on the front side near the bottom and the rear side near the top of the partition, respectively. The third air inlet and the third air outlet are connected to the two ends of the airflow channel inside the partition. After the first-stage housing is fixedly connected to the partition at its rear end, the second air outlet on the first-stage housing and the third air inlet on the partition are sealed and connected to each other. After the second-stage housing is fixedly connected to the partition at its front end, the third air outlet and the fourth air inlet are sealed and connected to each other. After the second-stage housing is fixedly connected to the partition at its rear end, the fifth air outlet and the third air inlet are sealed and connected to each other. After the third-stage housing is fixedly connected to the partition at its front end, the third air outlet and the fifth air inlet are sealed and connected to each other. After the first-stage housing, the second-stage housing, and the third-stage housing are connected in series and sealed and fixed through partitions, the assembly of the three-stage housing assembly is realized.

[0021] During gas transmission, baffles are used to block the first air outlet at the bottom of the first-stage and second-stage housings, and the first air inlet at the top of the second-stage and third-stage housings. The gas can then pass sequentially through the first air inlet and second air outlet on the first-stage housing, the third air inlet and third air outlet on the partition at the rear end of the first-stage housing, the fourth air inlet and fifth air outlet on the second-stage housing, the third air inlet and third air outlet on the partition at the rear end of the second-stage housing, and the fifth air inlet and first air outlet on the third-stage housing, thus completing the gas transmission process.

[0022] The first air inlet and the second air outlet on the first-stage housing, the third air inlet and the third air outlet on the partition at the rear end of the first-stage housing, the fourth air inlet and the fifth air outlet on the second-stage housing, the third air inlet and the third air outlet on the partition at the rear end of the second-stage housing, and the fifth air inlet and the first air outlet on the third-stage housing together form a complete airflow transmission channel inside the three-stage housing assembly.

[0023] Sealing ring grooves are respectively provided on the first-stage housing, the second-stage housing, and the third-stage housing at the outer positions of the first air inlet and the first air outlet;

[0024] The outer surfaces of the primary housing, secondary housing, tertiary housing, and partition are each provided with reinforcing ribs, and the reinforcing ribs are provided with multiple through holes.

[0025] Preferably, keyways are provided on the front and rear sides of the inner circumference of the mounting holes on the first-stage impeller, the second-stage impeller, and the third-stage impeller, and on the front and rear sides of the outer circumference of the impeller connecting column, respectively. Keyways are also provided at the rear end of the outer circumference of the inlet impeller shaft and the front end of the outer circumference of the outlet impeller shaft. The keyways are used to lock the inlet impeller shaft to the first-stage impeller, the outlet impeller shaft to the third-stage impeller, and the first-stage, second-stage, and third-stage impellers to the impeller connecting column, respectively.

[0026] The impeller connecting column consists of a middle section, a front section, and a rear section. The outer diameters of the front and rear sections are the same and smaller than the outer diameter of the middle section, forming a structure that is high in the middle and low on both sides. The keyways are located on the outer circumference of the front and rear sections, respectively.

[0027] The thickness ratio between the front section, rear section, and middle section of the impeller connecting column is 1:1:3.

[0028] Preferably, the counter-current air-cooling unit includes counter-current cooling air outlets and counter-current cooling air inlets, with multiple counter-current cooling air outlets and inlets. The multiple counter-current cooling air outlets are located on the first-stage housing, second-stage housing, and third-stage housing near the first air outlet, and are respectively connected to the inner cavity of the corresponding housing. The multiple counter-current cooling air inlets are located on the second-stage housing and third-stage housing near the first air inlet, and are respectively connected to the inner cavity of the corresponding housing. The counter-current cooling air inlets on the second-stage housing and the counter-current cooling air outlets on the first-stage housing, as well as the counter-current cooling air inlets on the third-stage housing and the counter-current cooling air outlets on the second-stage housing, are respectively connected to each other through counter-current cooling air pipes to form multiple independent counter-current cooling channels, which respectively circulate counter-current cooling to the inner cavities of the first-stage housing and the second-stage housing. A filter is provided on the counter-current cooling air outlet on the third-stage housing.

[0029] The circulating liquid cooling unit includes a liquid cooling channel inlet, a liquid cooling channel outlet, and liquid cooling channels. There are multiple liquid cooling channel inlets and outlets, which are located on the first-stage housing, second-stage housing, and third-stage housing, respectively, near the first air outlet. There are also multiple liquid cooling channels, which are located inside the first-stage housing, second-stage housing, and third-stage housing. The two ends of each liquid cooling channel extend to the top and bottom of the corresponding housing. The liquid cooling channel inlet and outlet on each housing are interconnected with the two ends of the corresponding liquid cooling channel inside the housing.

[0030] The circulating liquid cooling unit also includes a main liquid cooling inlet pipe and a main liquid cooling outlet pipe. The liquid cooling channels on the primary, secondary, and tertiary housings are respectively fixedly connected to the primary housing liquid cooling inlet pipe, the secondary housing liquid cooling inlet pipe, and the tertiary housing liquid cooling inlet pipe. The other ends of the primary, secondary, and tertiary housing liquid cooling inlet pipes are respectively fixedly connected to the main liquid cooling inlet pipe. The other end of the main liquid cooling inlet pipe can be connected to the liquid outlet of the liquid cooling equipment, realizing the injection of coolant into the interior of the liquid cooling channels. The cold aisle outlet is fixedly connected to the primary housing liquid cooling outlet pipe, the secondary housing liquid cooling outlet pipe and the tertiary housing liquid cooling outlet pipe respectively. The other end of the primary housing liquid cooling outlet pipe, the secondary housing liquid cooling outlet pipe and the tertiary housing liquid cooling outlet pipe are fixedly connected to the liquid cooling main outlet pipe respectively. The other end of the liquid cooling main outlet pipe can be connected to the liquid return port of the liquid cooling equipment to realize the output of coolant inside the liquid cooling aisle. The corresponding liquid cooling aisle inlet, liquid cooling aisle outlet, liquid cooling inlet pipe and liquid cooling outlet pipe on the primary housing, secondary housing and tertiary housing respectively form an independent liquid cooling circulation channel.

[0031] Both oil tanks are equipped with a liquid cooling inlet and a liquid cooling outlet. Both oil tanks have a liquid cooling channel inside. One end of the liquid cooling inlet on each oil tank is connected to one end of the liquid cooling channel of each oil tank. The other end of the liquid cooling inlet on each oil tank is connected to the main liquid cooling inlet pipe. One end of the liquid cooling outlet on each oil tank is connected to the other end of the liquid cooling channel of each oil tank.

[0032] The direct injection liquid cooling unit includes multiple direct injection cooling holes, which are located on the first-stage housing, the second-stage housing, and the third-stage housing near the first air outlet, and are respectively connected to the inner cavity of the corresponding housing.

[0033] The direct injection liquid cooling unit also includes a direct injection main inlet pipe. The direct injection cooling holes on the first-stage housing, second-stage housing, and third-stage housing are respectively fixedly connected to the first-stage housing direct injection inlet pipe, the second-stage housing direct injection inlet pipe, and the third-stage housing direct injection inlet pipe. The other end of the first-stage housing direct injection inlet pipe, the second-stage housing direct injection inlet pipe, and the third-stage housing direct injection inlet pipe are respectively fixedly connected to the direct injection main inlet pipe. The other end of the direct injection main inlet pipe is fixedly connected to the liquid cooling main inlet pipe, forming an independent direct injection cooling channel on each housing.

[0034] Preferably, the inner diameter of the direct injection cooling hole is 15mm ± 2mm.

[0035] Preferably, the number of counter-flow cooling air outlets on the primary housing, secondary housing, and tertiary housing are two, with the two counter-flow cooling air outlets on each housing located on the left and right sides of the first air outlet on the corresponding housing. The number of counter-flow cooling air inlets on the secondary housing and tertiary housing are two, with the two counter-flow cooling air inlets on each housing located on the left and right sides of the first air inlet on the corresponding housing. The counter-flow cooling air outlets and counter-flow cooling air inlets on the same side of the primary housing and the secondary housing, as well as the secondary housing and the tertiary housing, are connected to each other by counter-flow cooling air pipes, forming multiple independent counter-flow cooling channels on the left and right sides of the blower, which circulate and counter-flow cool the inner cavities of the primary housing and the secondary housing from the left and right sides respectively.

[0036] The primary, secondary, and tertiary housings each contain two liquid cooling channels, with the two channels located on the left and right sides of the corresponding housing interior.

[0037] The first-stage, second-stage, and third-stage housings all have liquid cooling channel inlets and outlets on both the left and right sides. The liquid cooling channel inlets and outlets on the left and right sides of each housing are connected to the two ends of the liquid cooling channel on the same side inside the corresponding housing, forming independent liquid cooling circulation channels on the left and right sides of each housing.

[0038] The primary, secondary, and tertiary housings each have two direct injection cooling holes, forming independent direct injection liquid cooling channels on the left and right sides of each housing.

[0039] Preferably, a sealing ring groove is provided on the outer side of the counterflow cooling outlet and the counterflow cooling inlet, and a sealing ring can be placed in the sealing ring groove.

[0040] Preferably, the partition is a split structure, consisting of an upper partition and a lower partition. The bottom end of the upper partition and the top end of the lower partition are respectively provided with two symmetrical semi-circular grooves. The front and rear ends of the upper and lower partitions near the outer side are respectively provided with symmetrical U-shaped grooves. The third air outlet is located on the upper partition near the rear side of the top end. The interior of the upper partition is provided with a first airflow channel. One end of the first airflow channel is connected to the third air outlet, and the other end of the first airflow channel extends to the outer side of the bottom end of the upper partition. The third air inlet is located on the lower partition near the front side of the bottom end. The interior of the lower partition is provided with a second airflow channel. One end of the second airflow channel is connected to the third air inlet, and the other end of the second airflow channel extends to the outer side of the top end of the lower partition.

[0041] After the upper and lower partition plates are assembled and fixed, the two semi-circular grooves arranged symmetrically on the upper and lower sides form two impeller shaft support holes, which provide rotational support for the impeller connecting column.

[0042] After the upper and lower partitions are assembled and fixed, the two symmetrical U-shaped grooves at the front and rear ends of the partitions form complete sealing ring grooves respectively. The sealing ring grooves are equipped with sealing rings, and the primary housing, secondary housing, tertiary housing and partitions are mutually sealed and fixed through the sealing rings.

[0043] After the upper and lower partitions are assembled and fixed, the first airflow channel and the second airflow channel are interconnected, and the third air inlet, the second airflow channel, the first airflow channel, and the third air outlet form a complete airflow transmission channel inside the partition.

[0044] Preferably, a sealing ring groove is provided on the outside of the third air inlet and the third air outlet on the partition plate, and a sealing ring is provided in the sealing ring groove. The sealing rings are used to seal and fix the third air inlet and the third air outlet with the second air outlet, the fourth air inlet, the fifth air outlet, and the fifth air inlet, respectively.

[0045] The beneficial effects of this invention are:

[0046] 1. By setting both the casing assembly and impeller assembly as a multi-stage combined installation structure, the casing assembly is designed and assembled from multiple casing units in series, with adjacent casing units connected by a partition for sealing. The impeller assembly is designed and assembled from multiple impellers in series, with adjacent impellers fixedly connected by an impeller connecting column. Under the premise of keeping the motor parameters unchanged, by selecting different numbers of casings and impellers for series combination and assembly, single-stage Roots blowers, two-stage Roots blowers, three-stage Roots blowers, or even more-stage Roots blowers can be assembled to meet different flow requirements. This has a wider range of applications, fewer limitations, and more flexible assembly and combination, avoiding the problem of excessive inventory and high cost of different specifications of the same model of blower.

[0047] 2. Due to the independent modular design of cooling methods for multiple housing units and oil tanks, the cooling system consists of multiple cooling units, including counter-flow air cooling units, circulating liquid cooling units, and direct injection liquid cooling units. Each cooling unit is assembled using an independent modular design, forming multiple independent and isolated cooling channels inside the multiple housing units and oil tanks. This allows for independent cooling and temperature reduction of the housing cavity, housing body, housing outlet, and oil tank, resulting in a significant cooling effect. Furthermore, the cooling process is continuously cyclical, which can continuously reduce the temperature of various areas during blower operation and extend the overall service life of the blower.

[0048] 3. The baffle is designed as a split structure consisting of an upper baffle and a lower baffle, which facilitates the assembly and maintenance of components such as impellers and casing. For example, the impeller assembly can be completed in advance, resulting in high assembly efficiency of the blower. Furthermore, when one of the impellers is damaged and needs to be replaced during blower operation, the faulty impeller can be removed and replaced simply by opening the baffle at the corresponding position. The operation is simple and quick, avoiding the need to disassemble too many parts and cause damage to related components, thus reducing maintenance costs. Similarly, the casing and baffles can be disassembled and replaced individually.

[0049] Furthermore, it can avoid changes in related gaps and dimensions caused by disassembling too many parts, such as the gap between the impeller and the inner wall of the casing, the meshing gap between the two impellers, etc., which directly affect the operating performance of the blower. Attached Figure Description

[0050] Figure 1 This is a perspective view of the present invention;

[0051] Figure 2 This is a perspective view of the present invention from another angle;

[0052] Figure 3 This is another perspective view of the present invention;

[0053] Figure 4 This is the main view of the present invention;

[0054] Figure 5 This is the right view of the present invention;

[0055] Figure 6 This is the present invention. Figure 5 BB section view;

[0056] Figure 7 This is the present invention. Figure 4 Sectional views of CC and DD;

[0057] Figure 8 This is a perspective view of the housing assembly in this invention;

[0058] Figure 9 This is another perspective view of the housing assembly in this invention;

[0059] Figure 10 This is another perspective view of the housing assembly in this invention;

[0060] Figure 11 This is a perspective view of the primary housing in this invention;

[0061] Figure 12 This is a perspective view of the secondary housing in this invention;

[0062] Figure 13 This is a perspective view of the secondary housing in this invention from another angle;

[0063] Figure 14 This is a three-dimensional view of the three-level casing in this invention;

[0064] Figure 15 This is the front view of the primary housing in this invention;

[0065] Figure 16 This is the present invention. Figure 15 Sectional view of AA;

[0066] Figure 17 This is a perspective view of the partition in this invention;

[0067] Figure 18 This is a perspective view of the partition in this invention from another angle;

[0068] Figure 19 This is a cross-sectional view of the partition structure in this invention;

[0069] Figure 20 This is a perspective view of the upper partition in this invention;

[0070] Figure 21 This is a perspective view of the lower partition in this invention;

[0071] Figure 22 This is a perspective view of the impeller assembly in this invention;

[0072] Figure 23 This is a front view of the impeller assembly in this invention;

[0073] Figure 24 This is a three-dimensional view of the first-stage impeller in this invention;

[0074] Figure 25 This is a perspective view of the impeller connecting shaft in this invention.

[0075] Explanation of symbols in the diagram:

[0076] 1. Housing assembly; 101. Housing unit; 10101. Primary housing; 10102. Secondary housing; 10103. Tertiary housing; 10104. Inlet housing; 10105. Intermediate housing; 10106. Outlet housing; 2. First inlet port; 3. First outlet port; 4. Counterflow cooling outlet port; 5. Counterflow cooling inlet port; 6. Liquid cooling channel inlet; 7. Liquid cooling channel outlet; 8. Baffle; 801. Upper baffle; 802. Lower baffle; 9. 10. Second exhaust port; 11. Direct injection cooling port; 12. Liquid cooling channel; 13. Impeller shaft support hole; 14. Sealing ring groove; 15. First airflow channel; 16. Semi-circular groove; 17. Impeller assembly; 18. Inlet impeller shaft; 19. First-stage impeller; 20. Second-stage impeller; 21. Third-stage impeller; 22. Exhaust impeller shaft; 22. Impeller connecting column; 2201. Middle section of impeller connecting column; 2202. Front section of impeller connecting column; 2203. Rear section of impeller connecting column; 23. 24. Assembly hole; 25. Keyway; 26. Third air inlet; 27. Third air outlet; 28. Second airflow channel; 29. ​​Fourth air inlet; 30. Fifth air outlet; 31. Wall panel; 32. Oil tank; 33. Counterflow cooling air pipe; 34. Liquid cooling main inlet pipe; 35. Liquid cooling main outlet pipe; 36. Direct injection main inlet pipe; 37. Reinforcing rib; 38. Support column; 39. Counterflow air cooling unit; 40. Circulating liquid cooling unit; 41. Direct injection liquid cooling unit; 42. Filter; 43. Primary housing liquid cooling inlet pipe; 44. Secondary housing liquid cooling inlet pipe; 45. Tertiary housing liquid cooling inlet pipe; 46. Primary housing liquid cooling outlet pipe; 47. Secondary housing liquid cooling outlet pipe; 48. Tertiary housing liquid cooling outlet pipe; 49. Primary housing direct injection inlet pipe; 50. Secondary housing direct injection inlet pipe; 51. Tertiary housing direct injection inlet pipe; 52. U-shaped groove; 53. Fuel tank liquid cooling inlet; 54. Fuel tank liquid cooling outlet; 55. Fuel tank liquid cooling channel. Detailed Implementation

[0077] The present invention will be further described below with reference to embodiments.

[0078] pass Figures 1-25It can be seen that the multi-stage assembled Roots blower includes a casing assembly 1, an impeller assembly 16, a wall plate 31, an oil tank 32, a transmission assembly, and a cooling assembly. Both the casing assembly 1 and the impeller assembly 16 are multi-stage series installation structures, and the cooling assembly is a combined circulating cooling structure.

[0079] The housing assembly 1 includes a housing unit 101 and a partition 8. There are multiple housing units 101. Each housing unit 101 has a first air inlet 2 and a first air outlet 3 at its top and bottom ends, respectively. The interior of the first air inlet 2 and the first air outlet 3 on each housing unit 101 is connected to the inner cavity of the corresponding housing unit 101.

[0080] Multiple housing units 101 are connected in series, and adjacent housing units 101 are sealed and fixedly connected by partitions 8. After the multiple housing units 101 are sealed and fixedly connected with partitions 8, they form a housing assembly 1. The housing assembly 1 has a complete airflow transmission channel inside. During gas transmission, only the first air inlet 2 at the top of the frontmost housing unit and the first air outlet 3 at the bottom of the rearmost housing unit are kept open. The other first air inlets 2 and first air outlets 3 are blocked. Gas can enter from the first air inlet 2 on the frontmost housing unit 101, pass through the airflow transmission channel, and exit from the first air outlet 3 on the rearmost housing unit 101, thus completing the gas transmission process.

[0081] The impeller assembly 16 is located inside the housing assembly 1 and can mesh and rotate inside the housing assembly 1. The wall plates 31 are located on the front and rear sides of the housing assembly 1 respectively and are sealed and fixedly connected to the front and rear sides of the housing assembly 1 respectively. The oil tank 32 is located on the outside of the two wall plates 31 respectively and is sealed and fixedly connected to the two wall plates 31 respectively.

[0082] The cooling assembly consists of multiple cooling units, each of which is an independent circulating cooling structure. The multiple cooling units respectively circulate and cool different areas inside the multi-stage assembled Roots blower.

[0083] In one specific embodiment, the housing unit 101 consists of a primary housing 10101, a secondary housing 10102, and a tertiary housing 10103. The primary housing 10101 is located at the front end, the secondary housing 10102 is located in the middle, and the tertiary housing 10103 is located at the rear end. Since the blower continuously pressurizes the gas during operation to achieve the gas transmission efficiency standard, the widths of the primary housing 10101, the secondary housing 10102, and the tertiary housing 10103 are arranged from widest to narrowest in sequence. When the gas passes through the airflow channels from widest to narrowest in sequence, the pressurization effect is achieved, ensuring the efficiency of gas transmission.

[0084] The first air inlet 2 and the first air outlet 3 are located at the top and bottom of the primary housing 10101, the secondary housing 10102, and the tertiary housing 10103, respectively. The interior of the first air inlet 2 and the first air outlet 3 on each housing communicates with the inner cavity of the corresponding housing. The primary housing 10101 and the secondary housing 10102, as well as the secondary housing 10102 and the tertiary housing 10103, are sealed and fixedly connected by partitions 8. When a housing is used alone, the first air inlet 2 and the first air outlet 3 are used for normal gas transmission. When multiple housings are combined... In use, the gas inlet and outlet are the first air inlet 2 at the front end of the casing and the first air outlet 3 at the rear end of the casing, respectively. The unused first air inlet 2 and first air outlet 3 can be sealed with baffles. When maintenance or repair of the blower's internal components is required, the unused first air inlet 2 and first air outlet 3 can be used as maintenance ports. Maintenance and repair can be carried out by opening the baffles. Temperature sensors, pressure sensors and other detection instruments can also be installed on the unused first air inlet 2 and first air outlet 3 to monitor the blower's operating parameters in real time.

[0085] A second air outlet 9 is provided on the rear side near the bottom of the primary housing 10101. A fourth air inlet 28 is provided on the front side near the top of the secondary housing 10102. A fifth air outlet 29 is provided on the rear side near the bottom of the secondary housing 10102. A fifth air inlet 30 is provided on the front side near the top of the tertiary housing 10103. An airflow channel is provided inside the partition 8, with both ends of the airflow channel extending to the positions near the top and bottom of the partition 8, respectively. A third air inlet 25 and a third air outlet 26 are provided on the front side near the bottom and the rear side near the top of the partition 8, respectively. The third air inlet 25 and the third air outlet 26 are respectively connected to the two ends of the airflow channel inside the partition 8. The primary housing 10101 After being fixedly connected to the partition plate 8 at its rear end, the second air outlet 9 on the first-stage housing 10101 and the third air inlet 25 on the partition plate 8 are sealed and connected to each other. After the second-stage housing 10102 is fixedly connected to the partition plate 8 at its front end, the third air outlet 26 and the fourth air inlet 28 are sealed and connected to each other. After the second-stage housing 10102 is fixedly connected to the partition plate 8 at its rear end, the fifth air outlet 29 and the third air inlet 25 are sealed and connected to each other. After the third-stage housing 10103 is fixedly connected to the partition plate 8 at its front end, the third air outlet 26 and the fifth air inlet 30 are sealed and connected to each other. After the first-stage housing 10101, the second-stage housing 10102, and the third-stage housing 10103 are sequentially connected in series and sealed and fixed through the partition plate 8, the assembly of the three-stage housing assembly is realized.

[0086] During gas transmission, baffles are used to block the first air outlet 3 at the bottom of the primary housing 10101 and the secondary housing 10102, and the first air inlet 2 at the top of the secondary housing 10102 and the tertiary housing 10103. The gas can then pass sequentially through the first air inlet 2 and the second air outlet 9 on the primary housing 10101, the third air inlet 25 and the third air outlet 26 on the partition 8 at the rear end of the primary housing 10101, the fourth air inlet 28 and the fifth air outlet 29 on the secondary housing 10102, the third air inlet 25 and the third air outlet 26 on the partition 8 at the rear end of the secondary housing 10102, and the fifth air inlet 30 and the first air outlet 3 on the tertiary housing 10103, thus completing the gas transmission process.

[0087] The first air inlet 2 and the second air outlet 9 on the first-stage housing 10101, the third air inlet 25 and the third air outlet 26 on the partition 8 at the rear end of the first-stage housing 10101, the fourth air inlet 28 and the fifth air outlet 29 on the second-stage housing 10102, the third air inlet 25 and the third air outlet 26 on the partition 8 at the rear end of the second-stage housing 10102, and the fifth air inlet 30 and the first air outlet 3 on the third-stage housing 10103 together form a complete airflow transmission channel inside the three-stage housing assembly.

[0088] In one specific embodiment, sealing ring grooves 13 are respectively provided on the first-stage housing 10101, the second-stage housing 10102 and the third-stage housing 10103 at the outer positions of the first air inlet 2 and the first air outlet 3. A sealing ring can be placed in the sealing ring groove 13 to achieve sealing and fixing between the first air inlet 2 and the first air outlet 3 and related components, such as baffles.

[0089] In one specific embodiment, the exterior of the primary housing 10101, secondary housing 10102, tertiary housing 10103, and partition 8 are respectively provided with reinforcing ribs 37. Multiple reinforcing ribs 37 can increase the overall structural strength of the blower housing and increase the overall impact resistance of the housing, preventing the housing from deforming and breaking under long-term high temperature and high pressure operation. Multiple through holes are provided on the reinforcing ribs 37. The multiple through holes on the primary housing 10101, secondary housing 10102, tertiary housing 10103, and partition 8 are axially symmetrically arranged. During assembly, bolts are used to sequentially axially penetrate the multiple axially symmetrical through holes on the primary housing 10101, secondary housing 10102, tertiary housing 10103, and partition 8 to achieve axial locking and fixation between the primary housing 10101, secondary housing 10102, tertiary housing 10103, and partition 8.

[0090] In one specific embodiment, the thickness of the primary casing 10101 is 470mm ± 5mm, the thickness of the secondary casing 10102 is 262mm ± 5mm, the thickness of the tertiary casing 10103 is 132mm ± 5mm, the thickness of the partition plate 8 is 58mm ± 3mm, and the thicknesses of the primary impeller 18, secondary impeller 19, and tertiary impeller 20 are the same as the thicknesses of the primary casing 10101, secondary casing 10102, and tertiary casing 10103, respectively. By adopting a structure in which the thicknesses of the primary casing 10101, secondary casing 10102, and tertiary casing 10103, as well as the primary, secondary, and tertiary impellers, decrease sequentially, staged pressurization during gas transmission can be achieved, resulting in pressurized gas transmission and ensuring efficient gas transmission. The thickness of the middle section 2201 of the impeller connecting column is the same as the thickness of the partition plate 8. Through the matching of these dimensions, single-stage, two-stage, three-stage, and even multi-stage Roots blowers can be assembled to meet the standard requirements for gas transmission flow rates in the range of 5-120 m³ / min. Depending on the specific transmission flow requirements, single-stage, two-stage, three-stage, or even multi-stage Roots blowers can be selected for assembly. Specifically, the two-stage Roots blower can meet flow rate requirements of 5-60 m³ / min, and the three-stage Roots blower can meet flow rate requirements of 60-120 m³ / min.

[0091] In one specific embodiment, the impeller assembly 16 includes an inlet impeller shaft 17, an impeller, an outlet impeller shaft 21, and an impeller connecting column 22. There are multiple impellers connected in series, and adjacent impellers are fixedly connected by the impeller connecting column 22 to form a multi-stage combined installation structure, which can be combined and installed according to the actual flow rate requirements.

[0092] In one specific embodiment, the impeller consists of a first-stage impeller 18, a second-stage impeller 19, and a third-stage impeller 20. The first-stage impeller 18 is located at the front air inlet, the second-stage impeller 19 is located in the middle, and the third-stage impeller 20 is located at the rear air outlet. The first-stage impeller 18, the second-stage impeller 19, and the third-stage impeller 20 are respectively provided with axially penetrating mounting holes in the middle.

[0093] The impeller shaft consists of an inlet impeller shaft 17 and an outlet impeller shaft 21. The rear end of the inlet impeller shaft 17 is inserted into the front end of the mounting hole on the first-stage impeller 18, thus fixing the inlet impeller shaft 17 to the first-stage impeller 18. The first-stage impeller 18 and the second-stage impeller 19, as well as the second-stage impeller 19 and the third-stage impeller 20, are respectively connected by impeller connecting posts 22 inserted into the mounting holes on adjacent impellers, thus locking the first-stage impeller 18, the second-stage impeller 19, and the third-stage impeller 20 in sequence. The front end of the outlet impeller shaft 21 is inserted into the rear end of the mounting hole on the third-stage impeller 20, thus fixing the outlet impeller shaft 21 to the third-stage impeller 20. After the inlet impeller shaft 17, the first-stage impeller 18, the second-stage impeller 19, the third-stage impeller 20, and the outlet impeller shaft 21 are connected in series and fixed together by the impeller connecting column 22, a cavity is left at the center of the first-stage impeller 18, the second-stage impeller 19, and the third-stage impeller 20. By leaving this cavity, the rotational inertia of the impeller shaft can be reduced, the motor can be started easily, and the load during motor start-up can be reduced, thus realizing the assembly of the three-stage impeller assembly. The width of the first-stage impeller 18, the second-stage impeller 19, and the third-stage impeller 20 is the same as that of the first-stage casing 10101, the second-stage casing 10102, and the third-stage casing 10103, respectively, and they can be used together to finally realize the assembly of the three-stage Roots blower.

[0094] In a specific embodiment, keyways 24 are provided on the front and rear sides of the inner circumference of the mounting holes 23 on the first-stage impeller 18, the second-stage impeller 19, and the third-stage impeller 20, and on the front and rear sides of the outer circumference of the impeller connecting column 22, respectively. Keyways 24 are also provided at the rear end of the outer circumference of the inlet impeller shaft 17 and the front end of the outer circumference of the outlet impeller shaft 21. The inlet impeller shaft 17 and the first-stage impeller 18, the outlet impeller shaft 21 and the third-stage impeller 20, and the first-stage impeller 18, the second-stage impeller 19, and the third-stage impeller 20 and the impeller connecting column 22 are respectively connected and locked by keyways 24. The key connection can not only ensure the firmness of the fixing between the components on the impeller assembly 16, but also realize the quick disassembly and assembly of the components on the impeller assembly 16, which is convenient for assembly and maintenance.

[0095] In one specific embodiment, the impeller connecting column 22 is composed of an impeller connecting column middle section 2201, an impeller connecting column front section 2202, and an impeller connecting column rear section 2203. The outer diameters of the impeller connecting column front section 2202 and the impeller connecting column rear section 2203 are the same and smaller than the outer diameter of the impeller connecting column middle section 2201, forming a structural shape that is high in the middle and low on both sides. The keyway 24 is located on the outer circumference of the impeller connecting column front section 2202 and the impeller connecting column rear section 2203, respectively. This structural design of the impeller connecting column 22 can ensure the consistency of the installation position of the impeller and the impeller connecting column 22 and avoid installation deviation.

[0096] In one specific embodiment, the thickness ratio of the front section 2202, the rear section 2203, and the middle section 2201 of the impeller connecting column is 1:1:3. The impeller connecting column 22 with this proportional structure ensures both the firmness of the impeller connecting column 22 and the adjacent impellers on both sides, and the structural strength and stability of the impeller connecting column 22 itself, thus preventing the impeller connecting column 22 from deforming or breaking during the high-speed rotation of the impeller assembly 16.

[0097] In one specific embodiment, the interior of each housing unit 101 employs a combined cooling method of counter-current air cooling and liquid cooling. The counter-current air cooling channel and the liquid cooling channel are independent and isolated from each other. Through the combined cooling method of counter-current air cooling and liquid cooling, the internal cavity and shell of each housing unit 101 are cooled and reduced independently, which has a significant effect. It can continuously reduce the overall temperature of the housing unit 101, avoid excessive temperature, reduce the service life of related components, reduce the sealing performance of the blower, and ultimately ensure the stability of the blower operation.

[0098] The oil tank 32 uses a circulating liquid cooling method. The circulating liquid cooling channel is an independent channel, which is isolated from the cooling channel on the housing unit 101. It can independently cool the housing of the oil tank 32, with obvious effect. It can continuously reduce the overall temperature of the oil tank and avoid the oil tank body and the internal lubricating oil temperature from being too high, which would prevent the internal parts of the blower from being effectively lubricated and cooled, thus affecting the operating efficiency and service life of the blower.

[0099] The cooling system consists of a counter-flow air-cooling unit 39, a circulating liquid-cooling unit 40, and a direct-injection liquid-cooling unit 41. When the blower is running, it can achieve combined circulating cooling of the entire blower, extending the overall service life of the blower.

[0100] The counter-flow air-cooling unit 39 includes counter-flow cooling exhaust ports 4 and counter-flow cooling intake ports 5. There are multiple counter-flow cooling exhaust ports 4 and multiple counter-flow cooling intake ports 5. The multiple counter-flow cooling exhaust ports 4 are located on the primary housing 10101, secondary housing 10102, and tertiary housing 10103, respectively, near the first exhaust port 3, and are respectively connected to the inner cavity of the corresponding housing. The multiple counter-flow cooling intake ports 5 are located on the secondary and tertiary housings, respectively, near the first intake port 2, and are respectively connected to the inner cavity of the corresponding housing. The cavity is connected, and the counterflow cooling air inlet 5 on the secondary housing 10102 and the counterflow cooling air outlet 4 on the primary housing 10101, as well as the counterflow cooling air inlet 5 on the tertiary housing and the counterflow cooling air outlet 4 on the secondary housing 10102, are respectively sealed and connected to each other through counterflow cooling air pipes 33, forming multiple independent counterflow cooling channels, which respectively circulate and counterflow cool the inner cavity of the primary housing 10101 and the secondary housing 10102, so as to avoid the temperature in the inner cavity of the housing being too high and causing damage to related components.

[0101] The counter-flow cooling air outlet 4 on the three-stage housing 10103 is equipped with a filter 42. When the blower is running, the air in the external environment is filtered by the filter 42 and enters the cavity of the three-stage housing 10103 to perform counter-flow cooling on the inner cavity of the three-stage housing 10103.

[0102] The circulating liquid cooling unit 40 includes a liquid cooling channel inlet 6, a liquid cooling channel outlet 7, and a liquid cooling channel 11. There are multiple liquid cooling channel inlets 6 and outlets 7, which are located on the primary housing 10101, secondary housing 10102, and tertiary housing 10103, respectively, near the first air outlet 3. There are also multiple liquid cooling channels 11, which are located inside the primary housing 10101, secondary housing 10102, and tertiary housing 10103. The two ends of each liquid cooling channel 11 extend to the top and bottom of the corresponding housing. The liquid cooling channel inlet 6 and outlet 7 on each housing are interconnected with the two ends of the liquid cooling channel 11 inside the corresponding housing.

[0103] The circulating liquid cooling unit 40 also includes a liquid cooling main inlet pipe 34 and a liquid cooling main outlet pipe 35. Liquid cooling inlet pipes 43, 44, and 45 are fixedly connected to the liquid cooling channel inlets 6 on the primary housing 10101, secondary housing 10102, and tertiary housing 10103, respectively. The other ends of the primary housing liquid cooling inlet pipes 43, 44, and 45 are fixedly connected to the liquid cooling main inlet pipe 34. The other end of the liquid cooling main inlet pipe 34 can be connected to the liquid outlet of the liquid cooling equipment to allow coolant to be injected into the liquid cooling channel 11. The liquid cooling channel outlet 7 on housing 10103 is fixedly connected to a primary housing liquid cooling outlet pipe 46, a secondary housing liquid cooling outlet pipe 47, and a tertiary housing liquid cooling outlet pipe 48. The other ends of the primary housing liquid cooling outlet pipe 46, the secondary housing liquid cooling outlet pipe 47, and the tertiary housing liquid cooling outlet pipe 48 are fixedly connected to the main liquid cooling outlet pipe 35. The other end of the main liquid cooling outlet pipe 35 can be connected to the return port of the liquid cooling equipment to realize the output of coolant inside the liquid cooling channel 11. The corresponding liquid cooling channel inlet 6, liquid cooling channel outlet 7, liquid cooling inlet pipe, and liquid cooling outlet pipe on the primary housing 10101, secondary housing 10102, and tertiary housing 10103 form independent liquid cooling circulation channels. Figure 14 As can be seen, the two ends of the liquid cooling channel 11 extend to the first air inlet 2 at the top and the first air outlet 3 at the bottom, respectively, which expands the coverage of the liquid cooling channel 11 inside the casing, improves the cooling effect on the casing body, and continuously reduces the temperature of the casing body.

[0104] In one specific embodiment, each of the two oil tanks 32 is provided with an oil tank liquid cooling inlet 53 and an oil tank liquid cooling outlet 54. Each of the two oil tanks 32 has an oil tank liquid cooling channel 55 inside. One end of the oil tank liquid cooling inlet 53 on each of the two oil tanks 32 is connected to one end of the oil tank liquid cooling channel 55 of each of the two oil tanks 32, and the other end of the oil tank liquid cooling inlet 53 on each of the two oil tanks 32 is connected to the liquid cooling main inlet pipe 34. One end of the oil tank liquid cooling outlet 54 on each of the two oil tanks 32 is connected to the other end of the oil tank liquid cooling channel 55 of each of the two oil tanks 32. When the blower is running, the coolant is injected into the oil tank liquid cooling channel 55 of each of the two oil tanks through the liquid cooling main inlet pipe 34. After flowing in the oil tank liquid cooling channel 55, it flows out through the oil tank liquid cooling outlet 54 and the liquid cooling main outlet pipe 35, respectively, to achieve circulating liquid cooling of the two oil tanks 32, continuously reducing the temperature of the oil tanks 32, thereby reducing the temperature of the lubricating oil inside the oil tanks 32 and further increasing the operating efficiency of the blower.

[0105] The direct injection liquid cooling unit 41 includes multiple direct injection cooling holes 10, which are located near the first air outlet 3 on the primary housing 101, secondary housing 102, and tertiary housing 103, respectively, and are connected to the inner cavity of the corresponding housing. The direct injection liquid cooling unit 41 also includes a direct injection main inlet pipe 36. A primary housing direct injection inlet pipe 49, a secondary housing direct injection inlet pipe 50, and a tertiary housing direct injection inlet pipe 51 are fixedly connected to the direct injection cooling holes 10 on the primary housing 101, secondary housing 102, and tertiary housing 103, respectively. The other end of the primary housing direct injection inlet pipe 49, the secondary housing direct injection inlet pipe 50, and the tertiary housing direct injection inlet pipe 51 is fixedly connected to the main direct injection inlet pipe 36, and the other end of the main direct injection inlet pipe 36 is fixedly connected to the liquid cooling main inlet pipe 34. Each housing has a main direct injection inlet pipe 36. An independent direct-injection cooling channel is formed. When the blower is running, it can continuously liquid cool the first air outlet 3 inside the corresponding casing. Since the temperature at the first air outlet 3 is significantly higher than that at other locations when the blower is running, a high standard is required for cooling at this location to ensure the service life of the blower. Therefore, a direct-injection cooling hole 10 is set at the first air outlet 3 to precisely spray and cool the air outlet location through liquid cooling equipment. It is particularly important to note that the dimensions of the direct-injection cooling hole 10 have strict standards. The inner diameter of the direct-injection cooling hole 10 is 15mm ± 2mm. With this size, the cooling water injected into the air outlet location will be quickly vaporized and evaporated, which not only ensures precise cooling at the air outlet location, but also avoids the problem of cooling water mixing into the transmission channel due to untimely vaporization.

[0106] Ultimately, under the combined cooling effect of the counter-flow air cooling unit 39, the circulating liquid cooling unit 40, and the direct injection liquid cooling unit 41, the inner cavity of the casing, the casing body, and the air outlet of the casing are cooled efficiently and precisely. Moreover, the cooling process is continuously circulated, continuously reducing the temperature of all areas of the blower during operation and extending the service life of the blower.

[0107] In one specific embodiment, the number of counter-flow cooling air outlets 4 on the primary housing 10101, secondary housing 10102, and tertiary housing 10103 are two each. The two counter-flow cooling air outlets 4 on each housing are located on the left and right sides of the first air outlet 3 on the corresponding housing. The number of counter-flow cooling air inlets 5 on the secondary housing 10102 and tertiary housing 10103 are two each. The two counter-flow cooling air inlets 5 on each housing are located on the left and right sides of the first air inlet 2 on the corresponding housing. The primary housing 10101 and the secondary housing 10103... The counter-flow cooling air outlet 4 and counter-flow cooling air inlet 5 on the same side of the housing 10102 and the secondary housing 10102 and the tertiary housing 10103 are respectively connected to each other by counter-flow cooling air pipe 33, forming multiple independent counter-flow cooling channels on the left and right sides of the blower. The internal cavities of the primary housing 10101 and the secondary housing 10102 are circulated and cooled from the left and right sides respectively. By simultaneously and precisely cooling from both sides of the housing cavity, the cooling effect is more obvious, the coverage is wider and more comprehensive, and uneven cooling area is avoided, resulting in better cooling effect.

[0108] The primary housing 10101, secondary housing 10102, and tertiary housing 10103 each have two liquid cooling channels 11. The two liquid cooling channels 11 inside each housing are located on the left and right sides of the corresponding housing interior. The left and right sides of the primary housing 10101, secondary housing 10102, and tertiary housing 10103 each have liquid cooling channel inlets 6 and liquid cooling channel outlets 7. The liquid cooling channel inlets 6 and liquid cooling channel outlets 7 on the left and right sides of each housing are connected to the two ends of the liquid cooling channels 11 located on the same side of the corresponding housing interior. Independent liquid cooling circulation channels are formed on the left and right sides of each housing. By simultaneously and precisely cooling from both sides of the housing interior cavity, the cooling effect on the housing body is improved, the coverage of the housing is wider and more comprehensive, and uneven cooling areas are avoided, resulting in better cooling effect.

[0109] The number of direct injection cooling holes 10 on the primary housing 10101, secondary housing 10102, and tertiary housing 10103 are all two, forming independent direct injection liquid cooling channels on the left and right sides of each housing. Their function is also to improve the cooling effect on the first air outlet 3 by simultaneously and precisely spraying cooling from both sides of the first air outlet 3, and further avoid the situation of excessive temperature at the first air outlet 3.

[0110] In one specific embodiment, a sealing ring groove 13 is provided on the outer side of the counterflow cooling outlet 4 and the counterflow cooling inlet 5, respectively. A sealing ring can be placed in the sealing ring groove 13 to ensure the sealing performance when the counterflow cooling outlet 4 and the counterflow cooling inlet 5 are connected to the counterflow cooling air pipe 33, and to avoid gas leakage.

[0111] In one specific embodiment, the partition 8 is a split structure, consisting of an upper partition 801 and a lower partition 802. The bottom end of the upper partition 801 and the top end of the lower partition 802 are respectively provided with two vertically symmetrical semi-circular grooves 15. The upper partition 801 and the lower partition 802 have vertically symmetrical U-shaped grooves 52 at their front and rear ends near the outer sides. The third air outlet 26 is located on the upper partition 801 near the rear side of the top end. The upper partition 801 has a first airflow channel 14 inside, one end of which communicates with the third air outlet 26, and the other end of which extends through the upper partition 801. On the outer side of the bottom end, the third air inlet 25 is located on the lower partition 802 near the front side of the bottom end. The lower partition 802 has a second airflow channel 27 inside. One end of the second airflow channel 27 communicates with the third air inlet 25, and the other end extends to the outer side of the top end of the lower partition 802. After the upper partition 801 and lower partition 802 are assembled and fixed, two symmetrically arranged semi-circular grooves 15 form two impeller shaft support holes 12. The impeller connecting column 22 is rotated and supported through the impeller shaft support holes 12. After the upper partition 801 and lower partition 802 are assembled and fixed, two symmetrically arranged U-shaped grooves 52... The front and rear ends of the partition 8 form complete sealing ring grooves 13, and sealing rings are installed in the sealing ring grooves 13. The primary housing 10101, secondary housing 10102, tertiary housing 10103 and partition 8 are mutually sealed and fixed by the sealing rings to prevent the transmitted gas from leaking outward through the gap between the housing and the partition when the blower is running. After the upper partition 801 and lower partition 802 are assembled and fixed, the first airflow channel 14 and the second airflow channel 27 are interconnected. The third air inlet 25, the second airflow channel 27, the first airflow channel 14, and the third air outlet 26 form a complete airflow path inside the partition 8. The conveying channel is designed with a split structure for the baffle plate 8, which facilitates the assembly and maintenance of components such as the impeller and the casing. For example, the impeller assembly 16 can be assembled in advance without any installation interference between the baffle plate 8 and the impeller assembly 16. This results in high assembly efficiency for the blower. Furthermore, when one of the impellers is damaged and needs to be replaced during blower operation, the baffle plate 8 at the corresponding position can be removed to remove the faulty impeller for replacement. The operation is simple and quick, avoiding the need to disassemble too many parts and cause damage to related components, thus reducing maintenance costs. Similarly, the casing and baffle plate 8 can be disassembled and replaced individually.

[0112] Furthermore, it can avoid changes in related gaps and dimensions caused by disassembling too many parts, such as the gap between the impeller and the inner wall of the casing, the meshing gap between the two impellers, etc., which directly affect the operating performance of the blower.

[0113] In one specific embodiment, the partition plate 8 is provided with sealing ring grooves 13 on the outer side of the third air inlet 25 and the third air outlet 26, respectively. A sealing ring is provided in the sealing ring groove 13. The sealing rings achieve sealing and fixation between the third air inlet 25 and the third air outlet 26 and the second air outlet 9, the fourth air inlet 28, the fifth air outlet, and the fifth air inlet 30, respectively, so as to prevent gas leakage during the operation of the blower.

[0114] In a specific embodiment, when a two-stage Roots blower needs to be assembled, according to the flow requirement standard, either the first-stage casing 10101 or the second-stage casing 10102 or the third-stage casing 10103 is selected for use. The two casings are connected in series and sealed by a partition 8. At the same time, two impellers corresponding to the width of the selected casing are selected from the first-stage impeller 18, the second-stage impeller 19 and the third-stage impeller 20 for combination, thus realizing the assembly of the two-stage Roots blower.

[0115] When assembling a single-stage Roots blower, select one of the following based on the flow rate requirements: primary casing 10101, secondary casing 10102, or tertiary casing 10103. Simultaneously, select one impeller from the primary impeller 18, secondary impeller 19, and tertiary impeller 20 that corresponds to the chosen casing size for combination. This allows for flexible assembly of the single-stage Roots blower according to actual usage needs, resulting in a wider range of applications and fewer limitations. It also avoids the problem of excessive inventory and high costs associated with stockpiling different specifications of the same model of blower.

[0116] A modular design and assembly method for multi-stage Roots blowers with different flow rates is disclosed. The multi-stage Roots blower includes a casing assembly, an impeller assembly, a wall plate, an oil tank, a transmission assembly, and a cooling assembly. Both the casing assembly and the impeller assembly adopt multi-stage modular assembly.

[0117] The housing assembly is composed of multiple housing units assembled in series, with adjacent housing units sealed together by a partition.

[0118] The impeller assembly is composed of multiple impellers connected in series, with adjacent impellers fixedly connected by an impeller connecting column.

[0119] Multiple housing units and oil tanks adopt an independent modular cooling method. The cooling assembly consists of multiple cooling units, each of which is assembled independently and modularly. Multiple independent and isolated cooling channels are formed inside the multiple housing units and oil tanks 32 to cool and reduce the temperature of different areas on the multiple housing units and oil tanks 32.

[0120] In one specific embodiment, there are two U-shaped grooves 52 at the front and rear ends near the outer side of the upper partition 801 and the lower partition 802. Each pair of U-shaped grooves 52 is arranged adjacent to each other. After the upper partition 801 and the lower partition 802 are longitudinally assembled and fixed, the two symmetrical U-shaped grooves 52 form two complete sealing ring grooves 13 at the front and rear ends of the partition 8, respectively. A sealing ring can be placed in both complete sealing ring grooves 13, which can further enhance the reliability of the sealing and fixing between the primary housing 10101, the secondary housing 10102, the tertiary housing 10103 and the partition 8 through the sealing ring, and prevent the transmitted gas from leaking outward through the gap between the housing and the partition when the blower is running.

[0121] In one specific embodiment, there are two first airflow channels 14, located on the left and right sides of the interior of the upper partition 801, respectively. One end of each of the two first airflow channels 14 is connected to the third air outlet 26, and the other end of each of the two first airflow channels 14 extends to the outer side of the bottom end of the upper partition 801 and is located on the left and right sides of the two semicircular grooves 15. There are also two second airflow channels 27, located on the left and right sides of the interior of the lower partition 802, respectively. One end of each of the two second airflow channels 27 is connected to the third air outlet 26. The three air inlets 25 are connected, and the other ends of the two second airflow channels 27 extend to the outer top of the lower partition 802 and are located on the left and right sides of the two semi-circular grooves 15. After the upper partition 801 and the lower partition 802 are longitudinally assembled and fixed, the two first airflow channels 14 are connected to the two second airflow channels 27 on the same side. The third air inlet 25, the second airflow channel 27, the first airflow channel 14, and the third air outlet 26 form two complete and independent airflow transmission channels inside the partition 8, which can further ensure the gas transmission efficiency and the stability of the transmission pressure.

[0122] In one specific embodiment, the bottom end of the upper partition 801 is provided with through holes on the left and right sides of the channel openings of the two first airflow channels 14, and the top end of the lower partition 802 is provided with through holes on the left and right sides of the channel openings of the two second airflow channels 27. The through holes on the left and right sides of the upper partition 801 and the lower partition 802 are symmetrically arranged vertically. Bolts can be passed through the through holes on the same side of the upper partition 801 and the lower partition 802 to achieve longitudinal assembly and fixation of the upper partition 801 and the lower partition 802, thereby realizing the quick assembly and disassembly of the partition 8.

[0123] In one specific embodiment, when it is necessary to assemble a three-stage Roots blower, the following steps are included:

[0124] Step (1): Prepare the first-stage casing 10101, the second-stage casing 10102, the third-stage casing 10103, and the first-stage impeller 18, the second-stage impeller 19, and the third-stage impeller 20.

[0125] Step (2): Connect the first-stage impeller 18, the second-stage impeller 19, and the third-stage impeller 20 in series via impeller connecting column 22. Connect the inlet impeller shaft 17 and the outlet impeller shaft 21 to the outer axial direction of the impellers at both ends to form a three-stage impeller assembly.

[0126] Step (3): Assemble the first-stage housing 10101, the second-stage housing 10102, and the third-stage housing 10103 with the three-stage impeller assembly, the partition plate 8, the transmission assembly, the wall plate 31, and the oil tank 32, respectively.

[0127] Step (4): Connect the counter-flow cooling outlets 4 at both ends of the primary housing 10101 and the counter-flow cooling inlets 5 at both ends of the secondary housing 10102 to each other through counter-flow cooling pipes 33. Connect the counter-flow cooling outlets 4 at both ends of the secondary housing 10102 and the counter-flow cooling inlets 5 at both ends of the tertiary housing 10103 to each other through counter-flow cooling pipes 33, forming four independent counter-flow cooling channels. When the blower is running, a portion of the gas flowing through the inner cavities of the secondary housing 10102 and the tertiary housing 10103 will pass through the secondary housing in sequence. The counter-flow cooling air inlet 5, counter-flow cooling air pipe 33, and counter-flow cooling air outlet 4 on the primary housing 10102 and the secondary housing 10103 respectively flow back to the inner cavity of the primary housing 10101 and the secondary housing 10102, respectively, to perform counter-flow cooling on the inner cavity of the primary housing 10101 and the secondary housing 10102. At the same time, filters are installed on the counter-flow cooling air outlet 4 at both ends of the tertiary housing 10103. After being filtered by the filter 42, the air in the external environment enters the cavity of the tertiary housing 10103 to perform counter-flow cooling on the inner cavity of the tertiary housing 10103.

[0128] Step (5): Install baffles on the first air outlet 3 of the first-stage housing 10101 and the second-stage housing 10102, and on the first air inlet 2 of the second-stage housing 10102 and the third-stage housing 10103 respectively, and block them to ensure that when the blower is running, the gas can smoothly enter from the first air inlet 2 of the first-stage housing 10101, pass through the airflow transmission channel inside the housing assembly 1, and be discharged from the first air outlet 3 to complete the complete gas transmission process. The blocked first air inlet 2 and first air outlet 3 can be used as inspection and maintenance ports.

[0129] Step (6): Install the first-stage housing liquid cooling inlet pipe 43, the second-stage housing liquid cooling inlet pipe 44, and the third-stage housing liquid cooling inlet pipe 45 on the liquid cooling channel inlets 6 at both ends of the first-stage housing 10101, the second-stage housing 10102, and the third-stage housing 10103, respectively. The other ends of the first-stage housing liquid cooling inlet pipe 43, the second-stage housing liquid cooling inlet pipe 44, and the third-stage housing liquid cooling inlet pipe 45 are all connected to the main liquid cooling inlet pipe 34. The other end of the main liquid cooling inlet pipe 34 is connected to the liquid outlet of the liquid cooling equipment. Install the first-stage housing liquid cooling outlet pipe 4 on the liquid cooling channel outlets 7 at both ends of the first-stage housing 10101, the second-stage housing 10102, and the third-stage housing 10103, respectively. 6. The other ends of the liquid cooling outlet pipes 47 and 48 of the secondary housing, 46 and 47 of the primary housing, and 48 of the secondary housing are all connected to the main liquid cooling outlet pipe 35. The other end of the main liquid cooling outlet pipe 35 is connected to the return port of the liquid cooling equipment. Six independent liquid cooling circulation channels are formed on the primary housing 10101, the secondary housing 10102, and the tertiary housing 10103. When the blower is running, the coolant in the liquid cooling equipment circulates between the liquid cooling channel inlet 6, the liquid cooling channel 11, and the liquid cooling channel outlet 7 on the corresponding housing, and independently circulates and cools the three housings.

[0130] One end of the liquid cooling main inlet pipe 34 is fixedly connected to the liquid cooling inlet 53 of the two oil tanks 32, and the other end of the liquid cooling main outlet pipe 35 is connected to the liquid cooling outlet 54 of the two oil tanks 32. When the blower is running, the coolant in the cooling device enters the liquid cooling channel 55 in the oil tank 32 through the liquid cooling main inlet pipe 34 and the oil tank liquid cooling inlet 53 in sequence. After flowing through the oil tank liquid cooling channel 55, it flows back to the cooling device through the oil tank liquid cooling outlet 54 in sequence, thereby realizing independent circulating liquid cooling of the two oil tanks.

[0131] Step (7): Install the first-stage housing direct injection inlet pipe 49, the second-stage housing direct injection inlet pipe 50, and the third-stage housing direct injection inlet pipe 51 on the direct injection cooling holes 10 at both ends of the first-stage housing 10101, the second-stage housing 10102, and the third-stage housing 10103, respectively. The other ends of the first-stage housing direct injection inlet pipe 49, the second-stage housing direct injection inlet pipe 50, and the third-stage housing direct injection inlet pipe 51 are all connected to the direct injection main inlet pipe 36. The other end of the direct injection main inlet pipe 36 is connected to the liquid cooling main inlet pipe 34. 1. Six independent direct injection cooling channels are formed on the secondary housing 10102 and the tertiary housing 10103. When the blower is running, the liquid cooling equipment injects coolant into the direct injection cooling holes 10 at both ends of the primary housing 10101, the secondary housing 10102 and the tertiary housing 10103 through the liquid cooling main inlet pipe 34 and the direct injection main inlet pipe 36 respectively. Then, the coolant is sprayed out through the direct injection cooling holes 10 to the first air outlet 3, which precisely cools the air outlet 3, and finally completes the assembly of the three-stage Roots blower.

[0132] Connecting the first air inlet 2 of the first-stage housing 10101 to the air inlet pipe and connecting the first air outlet 3 of the third-stage housing 10103 to the air outlet pipe enables the normal operation of the three-stage Roots blower.

[0133] In a specific embodiment, in step (4), the counter-flow cooling outlets 4 at both ends of the three-stage housing 10103 can also be connected to external air-cooling devices to cool the inner cavity of the rear housing.

[0134] In a specific embodiment, in step (4), all four counter-flow cooling pipes 33 can be connected to external air-cooling equipment to continuously cool the gas flowing through the counter-flow cooling channel, reduce the temperature of the gas flowing through the counter-flow cooling channel, and further increase the cooling effect on the inner cavity of the casing.

[0135] In one specific embodiment, when assembling a three-stage Roots blower, the first-stage casing 10101 can be combined with two second-stage casings 10102, or the first-stage casing 10101 can be combined with two third-stage casings 10103. Correspondingly, the first-stage impeller 18 can be combined with two second-stage impellers 19, or the first-stage impeller 18 can be combined with two third-stage impellers 20, thus completing the assembly of the three-stage Roots blower.

[0136] In one specific embodiment, when assembling a three-stage Roots blower, any three of the primary casing 10101, secondary casing 10102, and tertiary casing 10103 can be selected for combination, or three casings of the same size can be selected for combination. Correspondingly, matching impellers are selected and assembled with the casings, thereby adapting to more flow requirements, having a wider range of applications, fewer limitations, and more flexible assembly combinations.

[0137] In a specific embodiment, when it is necessary to assemble a two-stage Roots blower, the first-stage casing 10101 can be combined with the second-stage casing 10102 or the third-stage casing 10103, and the first-stage impeller 18 can be combined with the second-stage impeller 19 or the third-stage impeller 20, thus completing the assembly of the two-stage Roots blower.

[0138] In one specific embodiment, when a two-stage Roots blower needs to be assembled, any two of the first-stage casing 10101, the second-stage casing 10102, and the third-stage casing 10103 can be combined, or two casings of the same size can be combined. Correspondingly, a matching impeller can be selected and assembled with the casing, thereby adapting to more flow requirements, having a wider range of applications, fewer limitations, and more flexible assembly combinations.

[0139] In a specific embodiment, during the assembly of a two-stage Roots blower, after the two casings are assembled, the first air outlet 3 on the front casing and the first air inlet 2 on the rear casing 102 need to be sealed with baffles to ensure normal gas transmission between the two casings. The sealed first air inlet 2 and first air outlet 3 can be used as inspection and maintenance ports. When the blower is stopped, the interior of the corresponding casing can be inspected through the first air inlet 2 and first air outlet 3. Similarly, in the assembly of a three-stage Roots blower, after the three casings are assembled, the first air outlet 3 on the front casing and the first air inlet 2 on the middle casing need to be sealed with baffles. The first air inlet 2 and the first air outlet 3 on the upper part of the machine, as well as the first air inlet 2 on the rear casing, are all sealed to ensure normal gas transmission between the three casings. The sealed first air inlet 2 and the first air outlet 3 can also be used as inspection and maintenance ports. Through the first air inlet 2 or the first air outlet 3, the degree of contamination in the inner cavity of the casing can be viewed in real time and cleaned. In addition, the safety clearance between the impeller and the inner wall of the casing can be directly measured to avoid the impeller and the inner wall of the casing being too small, which would cause wear between the impeller and the inner wall of the casing during the operation of the blower. At the same time, the degree of wear of the impeller can be directly viewed and replaced in time.

[0140] In a specific embodiment, when a single-stage Roots blower needs to be assembled, one of the following can be selected for use: primary casing 10101, secondary casing 10102, and tertiary casing 10103, based on the flow rate requirement standard. Correspondingly, a matching impeller is selected and combined with the casing for assembly, thereby adapting to more flow rate requirements, having a wider range of applications, fewer limitations, and more flexible assembly combinations.

[0141] In a specific embodiment, the specific assembly steps of the primary housing 10101, secondary housing 10102, and tertiary housing 10103 with the tertiary impeller assembly, partition 8, wall plate 31, and oil tank 32 in step (3) are as follows:

[0142] Step (a): Insert the first-stage housing 10101, the second-stage housing 10102, and the third-stage housing 10103 into the outer circumference of the impeller of the corresponding size.

[0143] Step (b): Since the partition 8 is a split structure consisting of an upper partition 801 and a lower partition 802, the upper partition 801 and the lower partition 802 are assembled from the top and bottom directions to the outer circumference of the impeller connecting column 22 between two adjacent impellers, and then the upper partition 801 and the lower partition 802 are locked and fixed with bolts.

[0144] Step (c): After the upper partition 801 and the lower partition 802 are locked and fixed, bolts are passed through multiple through holes on the primary housing 10101, the secondary housing 10102, the tertiary housing 10103, and the partition 8 to axially lock and fix the primary housing 10101, the secondary housing 10102, the tertiary housing 10103, and the partition 8. Then, the two wall plates 31 are fixedly connected to the primary housing 10101 and the tertiary housing 10103 respectively, and the two oil tanks 32 are fixedly connected to the two wall plates 31 respectively.

[0145] This multi-stage assembled Roots blower, by setting both the casing assembly 1 and the impeller assembly 16 as multi-stage combined installation structures, can be assembled into single-stage, two-stage, three-stage, or even more-stage Roots blowers by selecting different numbers of casings and impellers for series combination and assembly, under the premise of keeping the motor parameters unchanged, in order to meet different flow requirements, with a wider range of applications, fewer limitations, and more flexible assembly and combination.

[0146] However, the above description is merely a specific embodiment of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of the present invention should still fall within the scope of the claims of the present invention.

Claims

1. A multi-stage assembled Roots blower, characterized in that: It includes a housing assembly, an impeller assembly, a wall panel, an oil tank, a transmission assembly, and a cooling assembly. The housing assembly and the impeller assembly are both multi-stage series installation structures, and the cooling assembly is a combined circulating cooling structure. The housing assembly includes housing units and partitions. There are multiple housing units. Each housing unit has a first air inlet and a first air outlet at its top and bottom ends, respectively. The interior of the first air inlet and the first air outlet on each housing unit are respectively connected to the inner cavity of the corresponding housing unit. Multiple housing units are connected in series, and adjacent housing units are sealed and fixedly connected by a partition. After the multiple housing units are sealed and fixedly connected with the partition, they form the housing assembly. The housing assembly has a complete airflow transmission channel inside. During gas transmission, only the first air inlet at the top of the frontmost housing unit and the first air outlet at the bottom of the rearmost housing unit are kept open. The other first air inlets and first air outlets are blocked. Gas can enter from the first air inlet on the frontmost housing unit, pass through the airflow transmission channel, and exit from the first air outlet on the rearmost housing unit, thus completing the complete gas transmission process. The impeller assembly is located inside the housing assembly and can rotate inside the housing assembly. The wall panels are located on the front and rear sides of the housing assembly and are sealed and fixedly connected to the front and rear sides of the housing assembly respectively. The oil tank is located on the outside of the two wall panels and is sealed and fixedly connected to the two wall panels respectively. The cooling assembly consists of multiple cooling units, each of which is an independent circulating cooling structure. The multiple cooling units respectively circulate cooling and temperature reduction for different areas inside the multi-stage assembled Roots blower. The impeller assembly includes an inlet impeller shaft, an impeller, an outlet impeller shaft, and an impeller connecting column. There are multiple impellers connected in series, and adjacent impellers are fixedly connected by the impeller connecting column. The impeller consists of a first-stage impeller, a second-stage impeller, and a third-stage impeller. The first-stage impeller is located at the front end, the second-stage impeller is located in the middle, and the third-stage impeller is located at the rear end. Each of the first-stage, second-stage, and third-stage impellers has an axially penetrating mounting hole in the middle. The rear end of the inlet impeller shaft is fixedly connected to the front end of the mounting hole on the first-stage impeller. The first-stage impeller and the second-stage impeller, as well as the second-stage impeller and the third-stage impeller, are fixedly connected to the mounting holes on adjacent impellers via impeller connecting columns, thereby achieving sequential locking and fixing of the first-stage, second-stage, and third-stage impellers. The rear end of the mounting hole on the third-stage impeller is fixedly connected to the front end of the outlet impeller shaft. The inlet impeller shaft, the first-stage impeller, the second-stage impeller, the third-stage impeller, and the outlet impeller shaft are connected in series and fixed together by impeller connecting columns to achieve the assembly of a three-stage impeller assembly. The first-stage impeller, second-stage impeller, and third-stage impeller have the same width as the first-stage casing, second-stage casing, and third-stage casing, respectively, and can be used together to ultimately achieve the assembly of a three-stage Roots blower. Each of the aforementioned housing units employs a combined cooling method of counter-current air cooling and liquid cooling, with the counter-current air cooling channel and the liquid cooling channel being independent and isolated from each other. The oil tank uses a circulating liquid cooling method inside, and the cooling channel of the circulating liquid cooling is an independent channel, which is isolated from the cooling channel on the housing unit. The cooling system consists of a counter-current air cooling unit, a circulating liquid cooling unit, and a direct injection liquid cooling unit.

2. The multi-stage assembled Roots blower according to claim 1, characterized in that: The housing unit consists of a primary housing, a secondary housing, and a tertiary housing. The primary housing is located at the front end, the secondary housing is located in the middle, and the tertiary housing is located at the rear end. The widths of the primary, secondary, and tertiary housings are arranged sequentially from widest to narrowest. The first air inlet and the first air outlet are located at the top and bottom ends of the primary, secondary, and tertiary housings, respectively. The interiors of the first air inlet and the first air outlet on each housing are connected to the inner cavity of the corresponding housing. The primary housing and the secondary housing, as well as the secondary housing and the tertiary housing, are sealed and fixedly connected by partitions. A second air outlet is located on the rear side near the bottom of the first-stage casing. A fourth air inlet is located on the front side near the top of the second-stage casing. A fifth air outlet is located on the rear side near the bottom of the second-stage casing. A fifth air inlet is located on the front side near the top of the third-stage casing. An airflow channel is provided inside the partition, with both ends of the airflow channel extending to positions near the top and bottom of the partition, respectively. A third air inlet and a third air outlet are located on the front side near the bottom and the rear side near the top of the partition, respectively, and the third air inlet and the third air outlet are respectively connected to the two ends of the airflow channel inside the partition. After the first-stage housing is fixedly connected to the partition at its rear end, the second air outlet on the first-stage housing and the third air inlet on the partition are sealed and connected to each other. After the second-stage housing is fixedly connected to the partition at its front end, the third air outlet and the fourth air inlet are sealed and connected to each other. After the second-stage housing is fixedly connected to the partition at its rear end, the fifth air outlet and the third air inlet are sealed and connected to each other. After the third-stage housing is fixedly connected to the partition at its front end, the third air outlet and the fifth air inlet are sealed and connected to each other. After the first-stage housing, the second-stage housing, and the third-stage housing are sequentially connected in series and sealed and fixed through partitions, the assembly of the three-stage housing assembly is realized. During gas transmission, baffles are used to block the first air outlet at the bottom of the first-stage and second-stage housings, and the first air inlet at the top of the second-stage and third-stage housings. The gas can then pass sequentially through the first air inlet and second air outlet on the first-stage housing, the third air inlet and third air outlet on the partition at the rear end of the first-stage housing, the fourth air inlet and fifth air outlet on the second-stage housing, the third air inlet and third air outlet on the partition at the rear end of the second-stage housing, and the fifth air inlet and first air outlet on the third-stage housing, thus completing the gas transmission process. The first air inlet and second air outlet on the first-stage housing, the third air inlet and third air outlet on the partition at the rear end of the first-stage housing, the fourth air inlet and fifth air outlet on the second-stage housing, the third air inlet and third air outlet on the partition at the rear end of the second-stage housing, and the fifth air inlet and first air outlet on the third-stage housing together form a complete airflow transmission channel inside the three-stage housing assembly. Sealing ring grooves are respectively provided on the first-stage housing, the second-stage housing, and the third-stage housing at the outer positions of the first air inlet and the first air outlet; The primary housing, secondary housing, tertiary housing, and partition are each provided with reinforcing ribs on their exteriors, and the reinforcing ribs are provided with multiple through holes.

3. The multi-stage assembled Roots blower according to claim 1, characterized in that: Keyways are provided on the front and rear sides of the inner circumference of the mounting holes on the first-stage impeller, the second-stage impeller, and the third-stage impeller, on the front and rear sides of the outer circumference of the impeller connecting column, and at the rear end of the outer circumference of the inlet impeller shaft and the front end of the outer circumference of the outlet impeller shaft. The inlet impeller shaft and the first-stage impeller, the outlet impeller shaft and the third-stage impeller, and the first-stage impeller, the second-stage impeller, and the third-stage impeller and the impeller connecting column are respectively connected and locked by keyways. The impeller connecting column is composed of a middle section, a front section, and a rear section. The outer diameters of the front and rear sections are the same and smaller than the outer diameter of the middle section, forming a structure that is high in the middle and low on both sides. The keyways are located on the outer circumference of the front and rear sections, respectively. The thickness ratio between the front section, rear section, and middle section of the impeller connecting column is 1:1:

3.

4. The multi-stage assembled Roots blower according to claim 2, characterized in that: The counter-current air-cooling unit includes counter-current cooling air outlets and counter-current cooling air inlets, with multiple counter-current cooling air outlets and inlets. The counter-current cooling air outlets are located on the primary, secondary, and tertiary housings near the first air outlet and are connected to the inner cavity of their respective housings. Similarly, the counter-current cooling air inlets are located on the secondary and tertiary housings near the first air inlet and are connected to the inner cavity of their respective housings. The counter-current cooling air inlets on the secondary housing and the counter-current cooling air outlets on the primary housing, as well as the counter-current cooling air inlets on the tertiary housing and the counter-current cooling air outlets on the secondary housing, are mutually sealed and connected via counter-current cooling air pipes, forming multiple independent counter-current cooling channels. These channels provide circulating counter-current cooling to the inner cavities of the primary and secondary housings. A filter is installed on the counter-current cooling air outlet on the tertiary housing. The circulating liquid cooling unit includes a liquid cooling channel inlet, a liquid cooling channel outlet, and a liquid cooling channel. There are multiple liquid cooling channel inlets and outlets, which are located on the first-stage housing, second-stage housing, and third-stage housing, respectively, near the first air outlet. There are multiple liquid cooling channels, which are located inside the first-stage housing, second-stage housing, and third-stage housing. The two ends of each liquid cooling channel extend to the top and bottom of the corresponding housing. The liquid cooling channel inlet and outlet on each housing are interconnected with the two ends of the liquid cooling channel inside the corresponding housing. The circulating liquid cooling unit also includes a liquid cooling main inlet pipe and a liquid cooling main outlet pipe. The liquid cooling channel inlets on the primary, secondary, and tertiary housings are respectively fixedly connected to the primary housing liquid cooling inlet pipe, the secondary housing liquid cooling inlet pipe, and the tertiary housing liquid cooling inlet pipe. The other ends of the primary, secondary, and tertiary housing liquid cooling inlet pipes are respectively fixedly connected to the liquid cooling main inlet pipe. The other end of the liquid cooling main inlet pipe can be connected to the liquid outlet of the liquid cooling equipment to allow coolant to be injected into the liquid cooling channel. The primary, secondary, and tertiary housings... The liquid cooling channel outlet is fixedly connected to a primary housing liquid cooling outlet pipe, a secondary housing liquid cooling outlet pipe, and a tertiary housing liquid cooling outlet pipe, respectively. The other end of each of the primary, secondary, and tertiary housing liquid cooling outlet pipes is fixedly connected to a main liquid cooling outlet pipe. The other end of the main liquid cooling outlet pipe can be connected to the return port of the liquid cooling equipment to realize the output of coolant inside the liquid cooling channel. The corresponding liquid cooling channel inlet, liquid cooling channel outlet, liquid cooling inlet pipe, and liquid cooling outlet pipe on the primary, secondary, and tertiary housings respectively form independent liquid cooling circulation channels. Both oil tanks are provided with a liquid cooling inlet and a liquid cooling outlet. Both oil tanks have a liquid cooling channel inside. One end of the liquid cooling inlet on each oil tank is connected to one end of the liquid cooling channel of each oil tank. The other end of the liquid cooling inlet on each oil tank is connected to the main liquid cooling inlet pipe. One end of the liquid cooling outlet on each oil tank is connected to the other end of the liquid cooling channel of each oil tank. The direct injection liquid cooling unit includes a number of direct injection cooling holes. The number of direct injection cooling holes is multiple. The multiple direct injection cooling holes are located on the first-stage housing, the second-stage housing, and the third-stage housing, respectively, near the first air outlet, and are respectively connected to the inner cavity of the corresponding housing. The direct injection liquid cooling unit also includes a direct injection main inlet pipe. The direct injection cooling holes on the first-stage housing, second-stage housing, and third-stage housing are respectively fixedly connected to the first-stage housing direct injection inlet pipe, the second-stage housing direct injection inlet pipe, and the third-stage housing direct injection inlet pipe. The other end of the first-stage housing direct injection inlet pipe, the second-stage housing direct injection inlet pipe, and the third-stage housing direct injection inlet pipe are respectively fixedly connected to the direct injection main inlet pipe. The other end of the direct injection main inlet pipe is fixedly connected to the liquid cooling main inlet pipe, forming an independent direct injection cooling channel on each housing.

5. The multi-stage assembled Roots blower according to claim 4, characterized in that: The inner diameter of the direct injection cooling hole is 15mm ± 2mm.

6. The multi-stage assembled Roots blower according to claim 4, characterized in that: The primary, secondary, and tertiary housings each have two counter-current cooling air outlets, with the two counter-current cooling air outlets on each housing located on the left and right sides of the first air outlet on the corresponding housing. The secondary and tertiary housings each have two counter-current cooling air inlets, with the two counter-current cooling air inlets on each housing located on the left and right sides of the first air inlet on the corresponding housing. The counter-current cooling air outlets and counter-current cooling air inlets on the same side of the primary and secondary housings, as well as the secondary and tertiary housings, are connected to each other by counter-current cooling air pipes, forming multiple independent counter-current cooling channels on the left and right sides of the blower, respectively, to circulate and counter-currently cool the inner cavities of the primary and secondary housings from the left and right sides. The primary, secondary, and tertiary housings each contain two liquid cooling channels, with the two channels located on the left and right sides of the corresponding housing interior. The first-level housing, the second-level housing, and the third-level housing all have liquid cooling channel inlets and liquid cooling channel outlets on both the left and right sides. The liquid cooling channel inlets and liquid cooling channel outlets on the left and right sides of each housing are respectively connected to the two ends of the liquid cooling channel on the same side inside the corresponding housing, forming independent liquid cooling circulation channels on the left and right sides of each housing. The primary, secondary, and tertiary housings each have two direct injection cooling holes, forming independent direct injection liquid cooling channels on the left and right sides of each housing.

7. The multi-stage assembled Roots blower according to claim 4, characterized in that: The outer sides of the counterflow cooling outlet and the counterflow cooling inlet are respectively provided with sealing ring grooves, and sealing rings can be placed in the sealing ring grooves.

8. The multi-stage assembled Roots blower according to claim 2, characterized in that: The partition is a split structure, consisting of an upper partition and a lower partition. The bottom of the upper partition and the top of the lower partition are respectively provided with two symmetrical semi-circular grooves. The front and rear ends of the upper and lower partitions near the outer side are respectively provided with symmetrical U-shaped grooves. The third air outlet is located on the upper partition near the rear side of the top. The upper partition has a first airflow channel inside, one end of which is connected to the third air outlet, and the other end of which extends to the outer side of the bottom of the upper partition. The third air inlet is located on the lower partition near the front side of the bottom. The lower partition has a second airflow channel inside, one end of which is connected to the third air inlet, and the other end of which extends to the outer side of the top of the lower partition. After the upper and lower partition plates are assembled and fixed, the two semi-circular grooves arranged symmetrically on the upper and lower sides form two impeller shaft support holes, which provide rotational support for the impeller connecting column. After the upper and lower partitions are assembled and fixed, the two symmetrical U-shaped grooves at the front and rear ends of the partitions form complete sealing ring grooves respectively. The sealing ring grooves are equipped with sealing rings, and the primary housing, secondary housing, tertiary housing and partitions are mutually sealed and fixed through the sealing rings. After the upper and lower partitions are assembled and fixed, the first airflow channel and the second airflow channel are interconnected, and the third air inlet, the second airflow channel, the first airflow channel, and the third air outlet form a complete airflow transmission channel inside the partition.

9. The multi-stage assembled Roots blower according to claim 7, characterized in that: The partition plate has sealing ring grooves on the outside of the third air inlet and the third air outlet, and a sealing ring is installed in the sealing ring groove. The sealing rings are used to seal and fix the third air inlet and the third air outlet to the second air outlet, the fourth air inlet, the fifth air outlet, and the fifth air inlet, respectively.

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