Roots blower circulating cooling method with double-oil-pump circulating cooling device

Abstract

The invention provides a Roots blower circulating cooling method with a double-oil-pump circulating cooling device, the Roots blower comprises a Roots blower main body and the double-oil-pump circulating cooling device, the Roots blower main body comprises an oil tank, a driving end wall plate and a non-driving end wall plate, and the double-oil-pump circulating cooling device comprises a first oil pump, a second oil pump and a cooler. The oil tank communicates with the first oil pump and the second oil pump, the first oil pump and the second oil pump are connected in parallel, and the rear ends of the first oil pump and the second oil pump are connected with the driving end oil pipe assembly, the gear end oil pipe assembly and the non-driving end oil pipe assembly correspondingly to lubricate and cool the driving end bearing, the non-driving end bearing, the driving gear and the driven gear correspondingly. The first oil pump and the second oil pump can independently achieve circulating cooling of lubricating oil, when one oil pump breaks down, the other oil pump can be immediately switched to operate under the non-stop state, and long-time stable operation of the air blower is guaranteed. The circulating cooling device can be widely applied to circulating cooling of the roots blower.

Description

Technical Field

[0001] The present invention relates to a cooling method, and particularly to a circulating cooling method for a Roots blower with a double oil pump circulating cooling device. Background Art

[0003] A Roots blower is based on the relative movement of two lobe-shaped rotors in a cylinder, and realizes gas transportation through the formation and compression of a sealed chamber.

[0004] During the long-term operation of the blower, its internal temperature will increase significantly, and the continuous high temperature inside will directly cause damage to key components, such as bearings, gears, sealing rings, etc.

[0005] To solve the above problems, currently, most of them install a cooling fan on the outside of the blower to actively cool the blower by air cooling to reduce the overall temperature of the blower. However, since the cooling fan is installed outside the blower, the cooling effect is poor, and when the cooling fan fails, it will directly affect the cooling effect of the blower, ultimately shortening the service life of the blower. Summary of the Invention

[0007] In view of the above technical problems, the present invention provides a circulating cooling method for a Roots blower with a double oil pump circulating cooling device. A circulating cooling device is provided on the Roots blower, which can circulate and cool the lubricating oil in the oil tank. While the cooled lubricating oil lubricates the internal components of the blower, it can also efficiently cool and dissipate heat from the internal chamber and internal components, ensuring that a suitable working temperature is maintained inside the blower, realizing the long-term stable operation of the blower, and extending its service life.

[0008] Therefore, the technical solution of the present invention is a circulating cooling method for a Roots blower with a double oil pump circulating cooling device, including the following steps: Step (1): Open the fifth valve, the second valve, and the fourth valve respectively, and close the sixth valve, the eighth valve, and the first valve respectively; Step (2): Start the Roots blower and the first oil pump, and the Roots blower and the first oil pump enter the operating state respectively; Step (3): The first oil pump extracts the lubricating oil in the oil tank. After the lubricating oil is filtered by the filter, it enters the inside of the cooler through the oil pipe, the pressure transmitter, the oil passage in the first oil pump, the first one-way valve, and the oil inlet on the cooler. The cooler cools the lubricating oil inside; Among them, the flow state of the lubricating oil can be viewed in real time through the flow indicator, and the pressure state of the lubricating oil can be monitored in real time through the pressure transmitter; Step (4): The cooled lubricating oil enters the interiors of the fourth oil pipe at the drive end, the first oil pipe at the gear end, and the fourth oil pipe at the non-drive end respectively through the oil outlet on the cooler and the four-way joint on one side of the oil outlet in sequence; Step (5): The lubricating oil entering the interior of the fourth oil pipe at the drive end enters the interiors of the first oil pipe at the drive end and the second oil pipe at the drive end respectively through the third valve, the drive-end filter, the three-way joint, and the flow indicators on both sides of the three-way joint in sequence. Then, the lubricating oil sprays outwards through the first lubricating oil path and the first lubricating oil path, and the oil pipes on one side of the first lubricating oil path and the first lubricating oil path respectively. Since the other sides of the two oil pipes are respectively aligned with the bearing positions of the driving end of the driving impeller and the driven impeller inside the Roots blower, therefore, precise oil spraying lubrication and cooling can be achieved for the two bearings at the drive end; Step (6): For the lubricating oil entering the interior of the first oil pipe at the gear end, a part of it enters the interior of the pressure gauge through the flow indicator, the three-way joint, and the fourth valve in sequence, and the pressure value of the lubricating oil in the pipe is detected in real time through the pressure gauge. Another part of the lubricating oil sprays outwards through the flow indicator, the three-way joint, the fifth lubricating oil path, and the oil pipe on one side of the fifth lubricating oil path respectively. Since the other sides of the oil pipes are respectively aligned with the positions of the driving gear and the driven gear inside the Roots blower, therefore, precise oil spraying lubrication and cooling can be achieved for the driving gear and the driven gear respectively; Step (7): The lubricating oil entering the interior of the fourth oil pipe at the non-drive end enters the interiors of the first oil pipe at the non-drive end and the second oil pipe at the non-drive end respectively through the second valve, the non-drive-end filter, the three-way joint, and the flow indicators on both sides of the three-way joint in sequence. Then, the lubricating oil sprays outwards through the third lubricating oil path and the fourth lubricating oil path, and the oil pipes on one side of the third lubricating oil path and the fourth lubricating oil path respectively. Since the other sides of the two oil pipes are respectively aligned with the bearing positions of the non-drive end of the driving impeller and the driven impeller inside the Roots blower, therefore, precise oil spraying lubrication and cooling can be achieved for the two bearings at the non-drive end; Step (8): The lubricating oil splashed onto the two gears and the four bearings will flow back into the oil tank under the action of gravity, completing a single lubrication and cooling operation for the gears, bearings, and other related components inside the Roots blower; Step (9): Steps (3) to (8) are cycled to achieve continuous cyclic lubrication and cooling operations for the gears, bearings, and other related components inside the Roots blower.

[0009] Preferably, during the circulating cooling process, if the pressure transmitter or pressure gauge shows a relatively high pressure value, at this time, slowly open the first valve, and a small part of the lubricating oil in the oil pipe will sequentially pass through the first valve and the oil pipe and enter the interior of the fuel tank. When the pressure value of the pressure transmitter or pressure gauge drops to the normal pressure value, stop operating the first valve, and finally complete the pressure relief adjustment operation.

[0010] Preferably, during the circulating cooling process, when the pressure value of the pressure transmitter is lower than the set pressure value, it indicates that the first oil pump has failed. At this time, start the second oil pump, open the sixth valve, close the fifth valve, and switch to the normal operation of the second oil pump. The lubricating oil filtered by the filter is switched to enter the interior of the cooler through the oil pipe, the pressure transmitter, the oil passage in the second oil pump, the second one-way valve, and the oil inlet on the cooler respectively; During the operation of the second oil pump, under the one-way conduction of the first one-way valve, the lubricating oil will not enter the interior of the first oil pump. Moreover, since the fifth valve is in the closed state, at this time, the first oil pump can be repaired and replaced.

[0011] When the pressure value of the pressure transmitter is still lower than the set pressure value after switching to the operation of the second oil pump, it indicates that there is an oil leakage problem in the pipeline, and the Roots blower and the second oil pump need to be stopped for pipeline maintenance; When both the pressure transmitter and the pressure gauge are lower than the set pressure value during the circulating cooling process, on the basis of pipeline maintenance, it is also necessary to check whether the filter is blocked.

[0012] Preferably, the Roots blower with a double oil pump circulating cooling device includes a Roots blower main body and a double oil pump circulating cooling device. The Roots blower main body includes a fuel tank, a drive end wall plate, and a non-drive end wall plate. The double oil pump circulating cooling device includes a first oil pump, a second oil pump, and a cooler. The cooler is fixedly connected to the outside of the fuel tank, and lubricating oil circuits are respectively provided on the drive end wall plate and the non-drive end wall plate; An oil outlet is provided on the fuel tank. A fuel pipe is provided on the outer port of the oil outlet. The oil outlet is fixedly connected to the inlet of the fuel pipe. On one side of the outlet of the fuel pipe, a fifth valve and a sixth valve are respectively provided. The outlet of the fuel pipe is fixedly connected to one side port of the fifth valve and the sixth valve respectively. The other side ports of the fifth valve and the sixth valve are respectively fixedly connected to the inlets of a first oil pump and a second oil pump. On one side of the outlets of the first oil pump and the second oil pump, a tee joint is provided. The tee joint is provided with a first interface, a second interface, and a third interface. The outlets of the first oil pump and the second oil pump are respectively fixedly connected to the second interface and the first interface. A fuel pipe is connected to the third interface, and the other end of the fuel pipe is fixedly connected to the inlet of the cooler. On one side of the outlet of the cooler, a four-way joint is connected. The four-way joint is provided with a fourth interface, a fifth interface, a sixth interface, and a seventh interface. The outlet of the cooler is fixedly connected to the fourth interface. The outer sides of the fifth interface, the sixth interface, and the seventh interface are respectively connected with a drive-end oil pipe assembly, a gear-end oil pipe assembly, and a non-drive-end oil pipe assembly; The drive-end oil pipe assembly is fixedly connected to the outside of the drive-end wall panel. The gear-end oil pipe assembly and the non-drive-end oil pipe assembly are respectively fixedly connected to the outside of the non-drive-end wall panel. The other end of the drive-end oil pipe assembly is fixedly connected to one end of the lubricating oil path on the drive-end wall panel. The other end of the lubricating oil path is connected with a fuel pipe. The other side of the fuel pipe respectively aligns with the bearing positions of the drive ends of the main impeller and the driven impeller inside the Roots blower, so as to achieve precise oil injection lubrication and temperature reduction and cooling of the bearings at the drive end; The other end of the gear-end oil pipe assembly is fixedly connected to one end of a side lubricating oil path on the non-drive-end wall panel. The other end of the lubricating oil path is connected with a fuel pipe. The other side of the fuel pipe respectively aligns with the positions of the main gear and the driven gear inside the Roots blower, so as to achieve precise oil injection lubrication and temperature reduction and cooling of the main gear and the driven gear; The other end of the non-drive-end oil pipe assembly is fixedly connected to one end of the other side lubricating oil path on the non-drive-end wall panel. The other end of the lubricating oil path is connected with a fuel pipe. The other side of the fuel pipe respectively aligns with the bearing positions of the non-drive ends of the main impeller and the driven impeller inside the Roots blower, so as to achieve precise oil injection lubrication and temperature reduction and cooling of the bearings at the non-drive end.

[0013] Preferably, a filter is provided between the oil outlet of the fuel tank and the fuel pipe on one side of the oil outlet. The filter is fixedly connected to the outside of the fuel tank. The inlet of the filter is fixedly connected to the oil outlet of the fuel tank. The outlet of the filter is fixedly connected to the inlet of the fuel pipe. A pressure transmitter is provided on one side of the outlet of the fuel pipe. The outlet of the fuel pipe is fixedly connected to the inlet of the pressure transmitter. A four-way joint is provided on one side of the outlet of the pressure transmitter. The outlet of the pressure transmitter is fixedly connected to the fourth interface of the four-way joint. The fifth interface and the sixth interface of the four-way joint are respectively fixedly connected to the fifth valve and the sixth valve. A seventh valve is fixedly provided on the seventh interface of the four-way joint.

[0014] Preferably, first check valves are respectively provided at the oil outlets of the first oil pump and the second oil pump. The oil outlets of the first oil pump and the second oil pump are fixedly connected to the oil inlets of the first check valve and the second check valve respectively. The first check valve and the second check valve are respectively fixedly connected to the second interface and the first interface on the three-way joint on one side of the oil outlets of the first oil pump and the second oil pump. The third interface is fixedly connected to one end of the oil pipe. A four-way joint is provided between the other end of the oil pipe and the cooler. The oil pipe is fixedly connected to the fourth interface of the four-way joint. A first valve is fixedly connected to the fifth interface. The other end of the first valve is fixedly connected to an oil pipe. The other end of the oil pipe is fixedly connected to the oil inlet of the fuel tank. An eighth valve is fixedly connected to the sixth interface. The seventh interface is fixedly connected to the oil inlet of the cooler.

[0015] Preferably, the drive-end oil pipe assembly includes a drive-end fourth oil pipe. One end of the drive-end fourth oil pipe is fixedly connected to the fifth interface on the four-way joint on one side of the oil outlet of the cooler. The other end of the drive-end fourth oil pipe is connected to a third valve. The other end of the third valve is connected to a drive-end filter. A three-way joint is provided at the other end of the drive-end filter. The drive-end filter is fixedly connected to the first interface of the three-way joint. Flow indicators are respectively provided on one side of the second interface and the third interface of the three-way joint. The second interface and the third interface are respectively fixedly connected to the oil inlets of the flow indicators. The oil outlets of the two flow indicators are respectively connected to a drive-end first oil pipe and a drive-end second oil pipe. The lubricating oil paths on the drive-end wall plate include a first lubricating oil path and a second lubricating oil path. The other ends of the drive-end first oil pipe and the drive-end second oil pipe are respectively fixedly connected to one ends of the first lubricating oil path and the second lubricating oil path. The other ends of the first lubricating oil path and the second lubricating oil path are respectively connected to oil pipes. The other sides of the two oil pipes are respectively aligned with the bearing positions of the driving end of the driving impeller and the driven impeller inside the Roots blower, so as to achieve precise oil injection lubrication and temperature reduction cooling for the bearings at the driving end.

[0016] Preferably, the gear-end oil pipe assembly includes a gear-end first oil pipe. One end of the gear-end first oil pipe is fixedly connected to the sixth interface on the four-way joint on one side of the oil outlet of the cooler. A flow indicator is provided at the other end of the gear-end first oil pipe. The gear-end first oil pipe is fixedly connected to the oil inlet of the flow indicator. A three-way joint is provided on one side of the oil outlet of the flow indicator. The oil outlet of the flow indicator is fixedly connected to the first interface of the three-way joint. A fourth valve is connected to the second interface of the three-way joint. The other end of the fourth valve is connected to a pressure gauge. The lubricating oil path on the non-driving-end wall plate includes a fifth lubricating oil path. The third interface of the three-way joint is fixedly connected to one end of the fifth lubricating oil path. The other end of the fifth lubricating oil path is connected to an oil pipe. The other side of the oil pipe is respectively aligned with the positions of the driving gear and the driven gear inside the Roots blower, so as to achieve precise oil injection lubrication and temperature reduction cooling for the driving gear and the driven gear.

[0017] Preferably, the non-driving end oil pipe assembly includes a fourth oil pipe at the non-driving end. One end of the fourth oil pipe at the non-driving end is fixedly connected to the seventh interface on the four-way joint on one side of the oil outlet of the cooler. The other end of the fourth oil pipe at the non-driving end is connected with a second valve. The other end of the second valve is connected with a non-driving end filter. A three-way joint is provided at the other end of the non-driving end filter. The non-driving end filter is fixedly connected to the first interface of the three-way joint. Flow indicators are respectively provided on one side of the second interface and the third interface of the three-way joint. The second interface and the third interface are respectively fixedly connected to the oil inlets of the flow indicators. The oil outlets of the two flow indicators are respectively connected with a first oil pipe and a second oil pipe at the non-driving end. The lubricating oil path on the non-driving end wall panel further includes a third lubricating oil path and a fourth lubricating oil path. The first oil pipe and the second oil pipe at the non-driving end are respectively fixedly connected to one ends of the third lubricating oil path and the fourth lubricating oil path. The other ends of the third lubricating oil path and the fourth lubricating oil path are respectively connected with oil pipes. The other sides of the two oil pipes respectively align with the bearing positions of the non-driving ends of the driving impeller and the driven impeller inside the Roots blower, so as to achieve precise oil injection lubrication and cooling of the bearings at the non-driving end.

[0018] Preferably, the shape of the oil pipe on one side of the fifth lubricating oil path is T-shaped. There are a plurality of oil outlet holes at the end of the T-shaped oil pipe far from the fifth lubricating oil path. The plurality of oil outlet holes are arranged in a "one" shape and respectively align with the driving gear and the driven gear, so as to achieve precise oil injection lubrication and cooling of the driving gear and the driven gear respectively.

[0019] The beneficial effects of the present invention are as follows: 1. By assembling a first oil pump and a second oil pump on the Roots blower, both the first oil pump and the second oil pump can independently operate to realize the circulating cooling of the lubricating oil. When one of the oil pumps fails, it can be immediately switched to the other oil pump to operate without shutting down the machine, ensuring the long-term stable operation of the blower.

[0020] 2. By setting independent first oil pipe and second oil pipe at the driving end, as well as independent first lubricating oil path and second lubricating oil path, and the other ends of the first oil pipe and the second oil pipe at the driving end are respectively fixedly connected to one ends of the first lubricating oil path and the second lubricating oil path, and the other ends of the first lubricating oil path and the second lubricating oil path are respectively connected with oil pipes, and the other sides of the two oil pipes respectively align with the bearing positions of the driving ends of the driving impeller and the driven impeller inside the Roots blower, so as to achieve independent precise oil injection lubrication and cooling of the bearings at the driving end, and the effect is obvious.

[0021] 3. By setting up an independent first oil pipe and a second oil pipe at the non-driving end, as well as an independent third lubricating oil path and a fourth lubricating oil path, the first oil pipe and the second oil pipe at the non-driving end are respectively fixedly connected to one end of the third lubricating oil path and the fourth lubricating oil path. The other ends of the third lubricating oil path and the fourth lubricating oil path are respectively connected with oil pipes, and the other sides of the two oil pipes are respectively aligned with the bearing positions of the driving impeller and the driven impeller inside the Roots blower at the non-driving end, realizing independent and precise oil injection lubrication and cooling for the bearings at the non-driving end, with obvious effects.

[0022] 4. In order to improve the lubrication and cooling effects of the driving gear and the driven gear inside the Roots blower, the shape of the oil pipe on one side of the fifth lubricating oil path is T-shaped. There are multiple oil outlet holes at one end of the T-shaped oil pipe far away from the fifth lubricating oil path. The multiple oil outlet holes are arranged in a "one" shape and are respectively aligned with the driving gear and the driven gear, realizing precise oil injection lubrication and cooling for the driving gear and the driven gear respectively, with obvious effects.

[0023] 5. By setting up a first valve, during the circulating cooling process, if the pressure transmitter or the pressure gauge shows a too high pressure value, at this time, slowly open the first valve, and a small part of the lubricating oil in the oil pipe will successively pass through the first valve and the oil pipe and enter the inside of the oil tank. When the pressure value of the pressure transmitter or the pressure gauge drops to the normal pressure value, stop operating the first valve, and finally complete the pressure relief adjustment operation, ensuring that the standard pressure range is maintained during the lubricating oil transmission. The operation is simple and fast, and real-time adjustment can be achieved, with obvious effects. Description of the Drawings

[0025] Figure 1 is a schematic diagram of the complete structure and the circulating cooling path of the present invention; Figure 2 is Figure 1 the schematic diagram in the A direction in Figure 3 is Figure 1 the enlarged view at B in Figure 4 is Figure 1 the enlarged view at C in Figure 5 is Figure 1 the enlarged view at D in Figure 6 is the schematic diagram of the three-way joint structure in the present invention; Figure 7 is the schematic diagram of the four-way joint structure in the present invention.

[0026] Symbol Explanation in the Figures: 1. Fuel tank; 101. Fuel tank oil outlet; 2. Filter; 3. Oil pipe; 4. Pressure transmitter; 5. First oil pump; 6. Second oil pump; 7. First valve; 8. Cooler; 9. Pressure gauge; 10. Second valve; 11. Third valve; 12. Driving end oil pipe assembly; 1201. Driving end filter; 1202. Driving end first oil pipe; 1203. Driving end second oil pipe; 1205. Driving end fourth oil pipe; 13. Non-driving end oil pipe assembly; 1301. Non-driving end filter; 1302. Non-driving end first oil pipe; 1303. Non-driving end second oil pipe; 1304. Non-driving end third oil pipe; 1305. Non-driving end fourth oil pipe; 14. Gear end oil pipe assembly; 1401. Gear end first oil pipe; 15. Driving end wall panel; 1501. First lubricating oil path; 1502. Second lubricating oil path; 16. Non-driving end wall panel; 1601. Third lubricating oil path; 1602. Fourth lubricating oil path; 1603. Fifth lubricating oil path; 17. Fixed bracket; 18. Flow indicator; 19. Fourth valve; 20. Fifth valve; 21. Sixth valve; 22. Three-way joint; 2201. First interface; 2202. Second interface; 2203. Third interface; 23. Four-way joint; 2301. Fourth interface; 2302. Fifth interface; 2303. Sixth interface; 2304. Seventh interface; 24. Seventh valve; 25. Eighth valve; 26. Oil pump fixing bracket; 27. First check valve; 28. Second check valve. Detailed implementation manner

[0028] The present invention will be further described below in conjunction with embodiments.

[0029] Through Figures 1-7 It can be seen that the roots blower with a double oil pump circulating cooling device includes a roots blower main body and a double oil pump circulating cooling device. The roots blower main body includes a fuel tank 1, a driving end wall panel 15, and a non-driving end wall panel 16. The double oil pump circulating cooling device includes a first oil pump 5, a second oil pump 6, and a cooler 8. The cooler 8 is fixedly connected to the outside of the fuel tank 1, and lubricating oil paths are respectively provided on the driving end wall panel 15 and the non-driving end wall panel 16.

[0030] An oil outlet 101 is provided on the fuel tank 1. A fuel pipe 3 is provided on the outer port of the oil outlet 101. The oil outlet 101 is fixedly connected to the oil inlet of the fuel pipe 3. On one side of the oil outlet of the fuel pipe 3, a fifth valve 20 and a sixth valve 21 are respectively provided. The oil outlet of the fuel pipe 3 is fixedly connected to one side port of the fifth valve 20 and the sixth valve 21 respectively. The other side ports of the fifth valve 20 and the sixth valve 21 are respectively fixedly connected to the oil inlets of a first oil pump 5 and a second oil pump 6. By opening and closing the fifth valve 20 and the sixth valve 21, the switching operation between the first oil pump 5 and the second oil pump 6 is realized. On one side of the oil outlets of the first oil pump 5 and the second oil pump 6, a three-way joint 22 is provided. The three-way joint 22 is provided with a first interface 2201, a second interface 2202, and a third interface 2203. The oil outlets of the first oil pump 5 and the second oil pump 6 are respectively fixedly connected to the second interface 2202 and the first interface 2201. A fuel pipe 3 is connected to the third interface 2203. The other end of the fuel pipe 3 is fixedly connected to the oil inlet of a cooler 8. On one side of the oil outlet of the cooler 8, a four-way joint 23 is connected. The four-way joint 23 is provided with a fourth interface 2301, a fifth interface 2302, a sixth interface 2303, and a seventh interface 2304. The oil outlet of the cooler 8 is fixedly connected to the fourth interface 2301. The outer sides of the fifth interface 2302, the sixth interface 2303, and the seventh interface 2304 are respectively connected to a drive-end oil pipe assembly 12, a gear-end oil pipe assembly 14, and a non-drive-end oil pipe assembly 13. Among them, the cooler 8 can quickly cool down the lubricating oil.

[0031] The drive-end oil pipe assembly 12 is fixedly connected to the outside of the drive-end wall panel 15. The gear-end oil pipe assembly 14 and the non-drive-end oil pipe assembly 13 are respectively fixedly connected to the outside of the non-drive-end wall panel 16. The other end of the drive-end oil pipe assembly 12 is fixedly connected to one end of the lubricating oil path on the drive-end wall panel 15. The other end of the lubricating oil path is connected to a fuel pipe 3. The other side of the fuel pipe 3 respectively aligns with the bearing positions of the drive ends of the driving impeller and the driven impeller inside the Roots blower, so as to realize precise oil injection lubrication and cooling of the bearings at the drive end; the other end of the gear-end oil pipe assembly 14 is fixedly connected to one end of a side lubricating oil path on the non-drive-end wall panel 16. The other end of the lubricating oil path is connected to a fuel pipe 3. The other side of the fuel pipe 3 respectively aligns with the positions of the driving gear and the driven gear inside the Roots blower, so as to realize precise oil injection lubrication and cooling of the driving gear and the driven gear; the other end of the non-drive-end oil pipe assembly 13 is fixedly connected to one end of the other side lubricating oil path on the non-drive-end wall panel 16. The other end of the lubricating oil path is connected to a fuel pipe 3. The other side of the fuel pipe 3 respectively aligns with the bearing positions of the non-drive ends of the driving impeller and the driven impeller inside the Roots blower, so as to realize precise oil injection lubrication and cooling of the bearings at the non-drive end.

[0032] In order to ensure the cleanliness during the lubricating oil circulation, the following embodiments are adopted: A filter 2 is provided between the oil outlet 101 of the fuel tank 1 and the oil pipe 3 on one side of the oil outlet 101. The filter 2 is fixedly connected to the outside of the fuel tank 1. The oil inlet of the filter 2 is fixedly connected to the oil outlet 101 of the fuel tank 1, and the oil outlet of the filter 2 is fixedly connected to the oil inlet of the oil pipe 3.

[0033] In this embodiment, the filter 2 plays a role in filtering the lubricating oil and can filter out impurities in the lubricating oil.

[0034] In order to achieve real-time remote monitoring, the following embodiment is adopted: A pressure transmitter 4 is provided on the oil outlet side of the oil pipe 3 on the oil outlet side of the filter 2. The oil outlet of the oil pipe 3 is fixedly connected to the oil inlet of the pressure transmitter 4. A four-way joint 23 is provided on the oil outlet side of the pressure transmitter 4. The oil outlet of the pressure transmitter 4 is fixedly connected to the fourth interface 2301 of the four-way joint 23. The fifth interface 2302 and the sixth interface 2303 of the four-way joint 23 are respectively fixedly connected to a fifth valve 20 and a sixth valve 21. A seventh valve 24 is fixedly provided on the seventh interface 2304 of the four-way joint 23.

[0035] In this embodiment, by installing the pressure transmitter 4, the conversion between physical pressure and standard electrical signals can be achieved, and the pressure value of the lubricating oil in the oil pipe can be viewed in real time to handle problems in a timely manner. Moreover, the pressure transmitter 4 can be remotely monitored through wired transmission or wireless transmission. Additionally, a detection instrument can be installed on the seventh valve 24 according to actual requirements.

[0036] The oil outlets of the first oil pump 5 and the second oil pump 6 are respectively provided with a first one-way valve 27 and a second one-way valve 28. The oil outlets of the first oil pump 5 and the second oil pump 6 are fixedly connected to the oil inlets of the first one-way valve 27 and the second one-way valve 28 respectively. The first one-way valve 27 and the second one-way valve 28 are respectively fixedly connected to the second interface 2202 and the first interface 2201 on the three-way joint 22 on one side of the oil outlets of the first oil pump 5 and the second oil pump 6. The first one-way valve 27 and the second one-way valve 28 can prevent the lubricating oil from flowing back. The third interface 2203 is fixedly connected to one end of the oil pipe 3. A four-way joint 23 is provided between the other end of the oil pipe 3 and the cooler 8. The oil pipe 3 is fixedly connected to the fourth interface 2301 of the four-way joint 23. A first valve 7 is fixedly connected to the fifth interface 2302. The other end of the first valve 7 is fixedly connected to an oil pipe 3. The other end of the oil pipe 3 is fixedly connected to the oil inlet of the fuel tank 1. During the circulating cooling process, if the pressure transmitter 4 or the pressure gauge 9 shows that the pressure value is too high, at this time, slowly open the first valve 7, and a small part of the lubricating oil in the oil pipe will sequentially pass through the first valve 7 and the oil pipe 3 and enter the interior of the fuel tank 1. When the pressure value of the pressure transmitter 4 or the pressure gauge 9 drops to the normal pressure value, stop operating the first valve 7, and finally complete the pressure relief adjustment operation, ensuring that the standard pressure range is maintained during the lubricating oil transmission. The operation is simple and fast, and real-time adjustment can be achieved, with obvious effects.

[0037] In order to improve the application range and reduce the application limitations, the following embodiments are adopted: An eighth valve 25 is fixedly connected to the sixth interface 2303. The other end of the eighth valve 25 can be connected to a corresponding detection device according to actual needs, such as a temperature detection device, a flow rate detection device, a pressure detection device, a purity detection device, etc., or other pipelines can also be connected according to actual needs.

[0038] The seventh interface 2304 is fixedly connected to the oil inlet of the cooler 8.

[0039] In order to achieve independent and precise lubrication and cooling of the bearings at the driving ends of the active impeller and the driven impeller inside the roots blower, the following embodiments are adopted: The driving end oil pipe assembly 12 includes a fourth oil pipe 1205 at the driving end. One end of the fourth oil pipe 1205 at the driving end is fixedly connected to a fifth interface 2302 on a four-way joint 23 on one side of the oil outlet of the cooler 8. The other end of the fourth oil pipe 1205 at the driving end is connected to a third valve 11. The other end of the third valve 11 is connected to a driving end filter 1201. The driving end filter 1201 filters the lubricating oil again before the lubricating oil enters the driving end wallboard 15 to ensure the cleanliness of the lubricating oil entering the driving end wallboard 15 and avoid wear on related components caused by impurities mixed in the lubricating oil. A three-way joint 22 is provided at the other end of the driving end filter 1201. The driving end filter 1201 is fixedly connected to a first interface 2201 of the three-way joint 22. Flow indicators 18 are respectively provided on one side of a second interface 2202 and a third interface 2203 of the three-way joint 22. The flow indicators 18 can view the flow state of the lubricating oil in real time. When situations such as too slow flow of the lubricating oil occur, they can be discovered and processed in a timely manner to avoid potential safety hazards. The second interface 2202 and the third interface 2203 are respectively fixedly connected to the oil inlets of the flow indicators 18. The oil outlets of the two flow indicators 18 are respectively connected to a first oil pipe 1202 and a second oil pipe 1203 at the driving end. The lubricating oil path on the driving end wallboard 15 includes a first lubricating oil path 1501 and a second lubricating oil path 1502. The other ends of the first oil pipe 1202 and the second oil pipe 1203 at the driving end are respectively fixedly connected to one ends of the first lubricating oil path 1501 and the second lubricating oil path 1502. The other ends of the first lubricating oil path 1501 and the second lubricating oil path 1502 are respectively connected to oil pipes 3. The other sides of the two oil pipes 3 are respectively aligned with the bearing positions at the driving ends of the driving impeller and the driven impeller inside the Roots blower, so as to achieve independent and precise oil injection lubrication and cooling for the bearings at the driving end, with obvious effects.

[0040] In order to achieve independent and precise lubrication and cooling for the driving gear and the driven gear inside the Roots blower, the following embodiments are adopted: The gear-end oil pipe assembly 14 includes a first gear-end oil pipe 1401. One end of the first gear-end oil pipe 1401 is fixedly connected to the sixth interface 2303 on the four-way joint 23 on the oil outlet side of the cooler 8. The other end of the first gear-end oil pipe 1401 is provided with a flow indicator 18, and the first gear-end oil pipe 1401 is fixedly connected to the oil inlet of the flow indicator 18. A three-way joint 22 is provided on the oil outlet side of the flow indicator 18, and the oil outlet of the flow indicator 18 is fixedly connected to the first interface 2201 of the three-way joint 22. A fourth valve 19 is connected to the second interface 2202 of the three-way joint 22, and the other end of the fourth valve 19 is connected to a pressure gauge 9. Through the pressure gauge 9, the pressure value of the lubricating oil in the pipe can be viewed in real time. The lubricating oil path on the non-driving end wall 16 includes a fifth lubricating oil path 1603. The third interface 2203 of the three-way joint 22 is fixedly connected to one end of the fifth lubricating oil path 1603, and the other end of the fifth lubricating oil path 1603 is connected to an oil pipe 3. The other side of the oil pipe 3 is respectively aligned with the positions of the driving gear and the driven gear inside the Roots blower, so as to realize independent and precise oil injection lubrication and cooling of the driving gear and the driven gear, and the effect is obvious.

[0041] In order to realize independent and precise oil injection lubrication and cooling of the bearings at the non-driving ends of the driving impeller and the driven impeller inside the Roots blower, the following embodiments are adopted: The non-driving end oil pipe assembly 13 includes a fourth non-driving end oil pipe 1305. One end of the fourth non-driving end oil pipe 1305 is fixedly connected to the seventh interface 2304 on the four-way joint 23 on the oil outlet side of the cooler 8. The other end of the fourth non-driving end oil pipe 1305 is connected to a second valve 10, and the other end of the second valve 10 is connected to a non-driving end filter 1301. A three-way joint 22 is provided at the other end of the non-driving end filter 1301, and the non-driving end filter 1301 is fixedly connected to the first interface 2201 of the three-way joint 22. Flow indicators 18 are respectively provided on one side of the second interface 2202 and the third interface 2203 of the three-way joint 22, and the second interface 2202 and the third interface 2203 are respectively fixedly connected to the oil inlets of the flow indicators 18. The oil outlets of the two flow indicators 18 are respectively connected to a first non-driving end oil pipe 1302 and a second non-driving end oil pipe 1303. The lubricating oil path on the non-driving end wall 16 further includes a third lubricating oil path 1601 and a fourth lubricating oil path 1602. The first non-driving end oil pipe 1302 and the second non-driving end oil pipe 1303 are respectively fixedly connected to one ends of the third lubricating oil path 1601 and the fourth lubricating oil path 1602, and the other ends of the third lubricating oil path 1601 and the fourth lubricating oil path 1602 are respectively connected to an oil pipe 3. The other sides of the two oil pipes 3 are respectively aligned with the positions of the bearings at the non-driving ends of the driving impeller and the driven impeller inside the Roots blower, so as to realize independent and precise oil injection lubrication and cooling of the bearings at the non-driving end, and the effect is obvious.

[0042] In order to increase the compactness of the overall structure of the Roots blower, improve the convenience of maintenance, and enable it to be applied to different working conditions, the following embodiments are adopted: The cooler 8 is fixedly connected to the outside of the oil tank 1 through a fixing bracket 17. The position of the four-way joint 23 on the oil inlet side of the cooler 8 is fixed to the outside of the oil tank 1 through the fixing bracket 17. The driving-end oil pipe assembly 12 is fixedly connected to the outside of the driving-end wall plate 15 through the fixing bracket 17. The gear-end oil pipe assembly 14 and the non-driving-end oil pipe assembly 13 are respectively fixedly connected to the outside of the non-driving-end wall plate 16 through the fixing bracket 17.

[0043] In this embodiment, the components related to circulating cooling are respectively installed outside the blower through the fixing bracket 17, realizing the integrated structural layout of the whole blower, reducing the overall size of the blower, enabling it to be applied to working conditions of different areas. At the same time, since the components related to circulating cooling are integrated outside the blower, the internal circulation integrated cooling of the lubricating oil can be realized, without the need to externally connect complex cooling pipelines and cooling devices, reducing the floor area.

[0044] In order to improve the lubrication and cooling effect of the driving gear and the driven gear inside the Roots blower, the following embodiments are adopted: The shape of the oil pipe 3 on one side of the fifth lubricating oil path 1603 is T-shaped. There are multiple oil outlet holes at the end of the T-shaped oil pipe 3 far from the fifth lubricating oil path 1603. The multiple oil outlet holes are arranged in a "one" shape and are respectively aligned with the driving gear and the driven gear, realizing precise oil injection lubrication and cooling for the driving gear and the driven gear respectively.

[0045] In the present invention, the selected size of the oil pipe 3 is 22mm x 3.5mm, which can meet the smoothness of the lubricating oil flow.

[0046] The bottom ends of the first oil pump 5 and the second oil pump 6 are provided with an oil pump fixing bracket 26. The first oil pump 5 and the second oil pump 6 are both fixed at the upper end position of the oil pump fixing bracket 26, which can ensure that the first oil pump 5 and the second oil pump 6 can be moved and rotated as a whole, avoiding the problem that the pipeline between the first oil pump 5 and the second oil pump 6 is misaligned and damaged due to the separate movement of the first oil pump 5 or the second oil pump 6.

[0047] A method for circulating cooling by a Roots blower with the above double-oil-pump circulating cooling device includes the following steps: Step (1): Open the fifth valve 20, the second valve 10, and the fourth valve 19 respectively, and close the sixth valve 21, the eighth valve 25, and the first valve 7 respectively.

[0048] Step (2): Start the Roots blower and the first oil pump 5, and the Roots blower and the first oil pump 5 respectively enter the operating state.

[0049] Step (3): The first oil pump 5 extracts the lubricating oil in the fuel tank 1. After the lubricating oil is filtered by the filter 2, it enters the interior of the cooler 8 through the oil pipe 3, the pressure transmitter 4, the oil passage in the first oil pump 5, the first one-way valve 27, and the oil inlet on the cooler 8 respectively. The cooler 8 cools the lubricating oil inside.

[0050] Among them, the flow state of the lubricating oil can be viewed in real time through the flow indicator 18, and the pressure state of the lubricating oil can be monitored in real time through the pressure transmitter 4.

[0051] Step (4): The cooled lubricating oil enters the interiors of the fourth oil pipe 1205 at the driving end, the first oil pipe 1401 at the gear end, and the fourth oil pipe 1305 at the non-driving end respectively through the oil outlet on the cooler 8 and the four-way joint 23 on one side of the oil outlet.

[0052] Step (5): The lubricating oil entering the interior of the fourth oil pipe 1205 at the driving end enters the interiors of the first oil pipe 1202 and the second oil pipe 1203 at the driving end through the third valve 11, the filter 1201 at the driving end, the three-way joint 22, and the flow indicators 18 on both sides of the three-way joint 22 respectively. Then, the lubricating oil is sprayed outwards through the first lubricating oil path 1501, the first lubricating oil path 1501, and the oil pipes 3 on one side of the first lubricating oil path 1501 and the first lubricating oil path 1501 respectively. Since the other sides of the two oil pipes 3 are respectively aligned with the bearing positions of the driving ends of the driving impeller and the driven impeller inside the roots blower, the two bearings at the driving end can be accurately lubricated by spraying oil and cooled.

[0053] Step (6): For the lubricating oil entering the interior of the first oil pipe 1401 at the gear end, a part of it enters the interior of the pressure gauge 9 through the flow indicator 18, the three-way joint 22, and the fourth valve 19 in sequence, and the pressure value of the lubricating oil in the pipe is detected in real time through the pressure gauge 9. Another part of the lubricating oil is sprayed outwards through the flow indicator 18, the three-way joint 22, the fifth lubricating oil path 1603, and the oil pipes 3 on one side of the fifth lubricating oil path 1603 respectively. Since the other sides of the oil pipes 3 are respectively aligned with the positions of the driving gear and the driven gear inside the roots blower, the driving gear and the driven gear can be accurately lubricated by spraying oil and cooled respectively.

[0054] Step (7): The lubricating oil that enters the interior of the non-driving end fourth oil pipe 1305 sequentially passes through the second valve 10, the non-driving end filter 1301, the tee joint 22, and the flow indicators 18 on both sides of the tee joint 22 and enters the interiors of the non-driving end first oil pipe 1302 and the non-driving end second oil pipe 1303 respectively. Then, the lubricating oil is sprayed outwards through the third lubricating oil path 1601 and the fourth lubricating oil path 1602 and the oil pipes 3 on one side of the third lubricating oil path 1601 and the fourth lubricating oil path 1602 respectively. Since the other sides of the two oil pipes 3 are respectively aligned with the bearing positions of the driving impeller and the driven impeller inside the roots blower at the non-driving end, it is possible to achieve precise oil spraying lubrication and cooling of the two bearings at the non-driving end.

[0055] Step (8): The lubricating oil splashed onto the two gears and the four bearings will flow back to the oil tank 1 under the action of gravity, completing a single lubrication and cooling operation for the gears, bearings, and other related components inside the roots blower.

[0056] Step (9): Steps (3) to (8) are cycled to achieve continuous cyclic lubrication and cooling operations for the gears, bearings, and other related components inside the roots blower.

[0057] During the cyclic cooling process, if the pressure transmitter 4 or the pressure gauge 9 shows a high pressure value, at this time, slowly open the first valve 7, and a small part of the lubricating oil in the oil pipe will sequentially pass through the first valve 7 and the oil pipe 3 and enter the interior of the oil tank 1. When the pressure value of the pressure transmitter 4 or the pressure gauge 9 drops to the normal pressure value, stop operating the first valve 7, and finally complete the pressure relief adjustment operation to ensure that the standard pressure range is maintained during the transmission of the lubricating oil. The operation is simple and fast, and real-time adjustment can be achieved with obvious effects.

[0058] During the cyclic cooling process, when the pressure value of the pressure transmitter 4 is lower than the set pressure value, it indicates that the first oil pump 5 has failed. At this time, start the second oil pump 6, open the sixth valve 21, close the fifth valve 20, and switch to the normal operation of the second oil pump 6. The lubricating oil filtered by the filter 2 is switched to enter the interior of the cooler 8 respectively through the oil pipe 3, the pressure transmitter 4, the oil passage inside the second oil pump 6, the second one-way valve 28, and the oil inlet on the cooler 8, and resume the normal cyclic cooling operation.

[0059] During the operation of the second oil pump 6, under the one-way conduction of the first one-way valve 27, the lubricating oil will not enter the interior of the first oil pump 5. And since the fifth valve 20 is in the closed state, at this time, the first oil pump 5 can be repaired and replaced without affecting the normal cyclic lubrication and cooling work of the blower.

[0060] After switching to the operation of the second oil pump 6, when the pressure value of the pressure transmitter 4 is still lower than the set pressure value, it indicates that there is an oil leakage problem in the pipeline. It is necessary to stop the roots blower and the second oil pump 6 and repair the pipeline.

[0061] When both the pressure transmitter 4 and the pressure gauge 9 are lower than the set pressure value during the circulating cooling process, on the basis of repairing the pipeline, it is also necessary to check whether the filter 2 is blocked.

[0062] On the roots blower with a double-oil-pump circulating cooling device, the first oil pump 5 and the second oil pump 6 are assembled. Both the first oil pump 5 and the second oil pump 6 can independently operate to achieve the circulating cooling of the lubricating oil. When one of the oil pumps fails, it can be immediately switched to the operation of the other oil pump without shutting down the machine, ensuring the long-term stable operation of the blower.

[0063] However, the above are only specific embodiments of the present invention, and the scope of implementation of the present invention cannot be limited thereby. Therefore, the replacement of equivalent components or equivalent changes and modifications made according to the scope of protection of the present invention patent shall still fall within the scope covered by the claims of the present invention.

Claims

1. A Roots blower circulating cooling method with a double oil pump circulating cooling device, characterized in that: The method comprises the following steps: Step (1): Open the fifth valve, the second valve, and the fourth valve respectively, and close the sixth valve, the eighth valve, and the first valve respectively; Step (2): starting the Roots blower and the first oil pump, and the Roots blower and the first oil pump enter the operating state respectively; Step (3): the first oil pump extracts lubricating oil from the oil tank, and after the lubricating oil is filtered by the filter, it enters the interior of the cooler through the oil pipe, the pressure transmitter, the oil channel in the first oil pump, the first one-way valve and the oil inlet on the cooler, and the cooler cools the lubricating oil inside; Among them, the flow indicator can be used to check the flow status of the lubricating oil in real time, and the pressure transmitter can be used to monitor the pressure status of the lubricating oil in real time; Step (4): The cooled lubricating oil enters the fourth oil pipe at the driving end, the first oil pipe at the gear end, and the fourth oil pipe at the non-driving end respectively through the oil outlet on the cooler and the four-way joint on one side of the oil outlet; Step (5): the lubricating oil entering the fourth oil pipe at the driving end passes through the third valve, the driving end filter, the three-way joint and the flow indicators on both sides of the three-way joint respectively and enters the first oil pipe at the driving end and the second oil pipe at the driving end respectively. Then, the lubricating oil is sprayed outwardly through the first lubricating oil path and the first lubricating oil path and the oil pipes on one side of the first lubricating oil path respectively. Since the other sides of the two oil pipes are respectively aligned with the bearing positions of the driving end of the active impeller and the driven impeller inside the Roots blower, it is possible to achieve precise oil spray lubrication and temperature reduction cooling of the two bearings at the driving end; Step (6): a portion of the lubricating oil entering the first oil pipe at the gear end enters the interior of the pressure gauge through the flow indicator, the three-way joint, and the fourth valve in sequence, and the pressure value of the lubricating oil in the pipe is detected in real time by the pressure gauge, and another portion of the lubricating oil is sprayed outward through the flow indicator, the three-way joint, the fifth lubricating oil passage, and the oil pipe on one side of the fifth lubricating oil passage in sequence. Since the other side of the oil pipe is respectively aligned with the positions of the driving gear and the driven gear inside the Roots blower, it is possible to respectively realize accurate oil spray lubrication and temperature reduction cooling of the driving gear and the driven gear; Step (7): the lubricating oil entering the fourth oil pipe at the non-driving end respectively enters the first oil pipe at the non-driving end and the second oil pipe at the non-driving end through the second valve, the non-driving end filter, the three-way joint and the flow indicators on both sides of the three-way joint, and then the lubricating oil is sprayed outward through the third lubricating oil circuit and the fourth lubricating oil circuit and the oil pipes on one side of the third lubricating oil circuit and the fourth lubricating oil circuit. Since the other sides of the two oil pipes are respectively aligned with the bearing positions of the non-driving ends of the driving impeller and the driven impeller inside the Roots blower, it is possible to achieve precise oil spray lubrication and temperature reduction cooling of the two bearings at the non-driving end; Step (8): The lubricating oil splashed onto the two gears and four bearings will flow back into the oil tank under the action of gravity, completing a single lubrication and cooling operation for the gears, bearings and other related components inside the Roots blower; Step (9): Step (3) to step (8) are repeated in a loop to achieve continuous circulation lubrication and cooling of the gears, bearings and other related components inside the Roots blower.

2. The circulating cooling method for a Roots blower with a dual oil pump circulating cooling device according to claim 1, characterized in that: During the circulating cooling process, if the pressure value displayed by the pressure transmitter or the pressure gauge is too high, at this time, slowly open the first valve, and a small amount of lubricating oil in the oil pipe will pass through the first valve and the oil pipe into the interior of the oil tank in turn. When the pressure value of the pressure transmitter or the pressure gauge drops to the normal pressure value, stop operating the first valve, and finally complete the pressure relief adjustment operation.

3. The circulating cooling method for a Roots blower with a dual oil pump circulating cooling device according to claim 1, characterized in that: During the circulating cooling process, when the pressure value of the pressure transmitter is lower than the set pressure value, it indicates that the first oil pump fails. At this time, the second oil pump is started, the sixth valve is opened, the fifth valve is closed, and the second oil pump is switched to normal operation. The lubricating oil filtered by the filter is switched to enter the interior of the cooler through the oil pipe, the pressure transmitter, the oil channel in the second oil pump, the second one-way valve and the oil inlet on the cooler; During the operation of the second oil pump, due to the one-way conduction of the first one-way valve, the lubricating oil will not enter the interior of the first oil pump, and since the fifth valve is in a closed state, the first oil pump can be repaired and replaced at this time; When the pressure value of the pressure transmitter is still lower than the set pressure value after switching to the second oil pump, it indicates that there is an oil leakage problem in the pipeline. It is necessary to stop the Roots blower and the second oil pump and inspect the pipeline. When the pressure transmitter and pressure gauge are both lower than the set pressure value during the circulating cooling process, in addition to inspecting the pipeline, it is also necessary to check whether the filter is blocked.

4. The circulating cooling method for a Roots blower with a dual oil pump circulating cooling device according to any one of claims 1 to 3, characterized in that: The Roots blower with a dual-oil pump circulation cooling device comprises a Roots blower body and a dual-oil pump circulation cooling device, wherein the Roots blower body comprises an oil tank, a driving end wall plate, and a non-driving end wall plate, and the dual-oil pump circulation cooling device comprises a first oil pump, a second oil pump, and a cooler, wherein the cooler is fixedly connected to the outside of the oil tank, and the driving end wall plate and the non-driving end wall plate are respectively provided with lubricating oil circuits; The oil tank is provided with an oil outlet, an oil pipe is provided on the outer port of the oil outlet, the oil outlet is fixedly connected to the oil inlet of the oil pipe, a fifth valve and a sixth valve are respectively provided on one side of the oil outlet of the oil pipe, the oil outlet of the oil pipe is fixedly connected to one side port of the fifth valve and the sixth valve respectively, the other side ports of the fifth valve and the sixth valve are respectively fixedly connected to the oil inlets of the first oil pump and the second oil pump, a tee joint is provided on one side of the oil outlet of the first oil pump and the second oil pump, a first interface, a second interface and a third interface are provided on the tee joint, the oil outlets of the first oil pump and the second oil pump are respectively fixedly connected to the second interface and the first interface, the third interface is connected with an oil pipe, the other end of the oil pipe is fixedly connected to the oil inlet of the cooler, a four-way joint is connected on one side of the oil outlet of the cooler, a fourth interface, a fifth interface, a sixth interface and a seventh interface are provided on the four-way joint, the oil outlet of the cooler is fixedly connected to the fourth interface, and the outer sides of the fifth interface, the sixth interface and the seventh interface are respectively connected to the driving end oil pipe assembly, the gear end oil pipe assembly and the non-driving end oil pipe assembly; The driving end oil pipe assembly is fixedly connected to the outside of the driving end wallboard, the gear end oil pipe assembly and the non-driving end oil pipe assembly are respectively fixedly connected to the outside of the non-driving end wallboard, the other end of the driving end oil pipe assembly is fixedly connected to one end of the lubricating oil circuit on the driving end wallboard, the other end of the lubricating oil circuit is connected to an oil pipe, and the other side of the oil pipe is respectively aligned with the bearing position of the driving end of the active impeller and the driven impeller inside the Roots blower, so as to realize precise oil injection lubrication and temperature reduction cooling of the bearing of the driving end; The other end of the gear end oil pipe assembly is fixedly connected to one end of a lubricating oil circuit on one side of the non-driving end wall plate, and the other end of the lubricating oil circuit is connected to an oil pipe, and the other side of the oil pipe is respectively aligned with the positions of the driving gear and the driven gear inside the Roots blower, so as to achieve precise oil injection lubrication and temperature reduction cooling of the driving gear and the driven gear; The other end of the non-drive end oil pipe assembly is fixedly connected to one end of the lubricating oil circuit on the other side of the non-drive end wall panel, and the other end of the lubricating oil circuit is connected to an oil pipe, and the other side of the oil pipe is respectively aligned with the bearing positions of the non-drive ends of the active impeller and the driven impeller inside the Roots blower, so as to achieve precise oil injection lubrication and temperature reduction cooling of the bearings at the non-drive end.

5. The circulating cooling method for a Roots blower with a dual oil pump circulating cooling device according to claim 4, characterized in that: A filter is provided between the oil outlet of the oil tank and the oil pipe on one side of the oil outlet, the filter is fixedly connected to the outside of the oil tank, the oil inlet of the filter is fixedly connected to the oil outlet of the oil tank, the oil outlet of the filter is fixedly connected to the oil inlet of the oil pipe, a pressure transmitter is provided on one side of the oil outlet of the oil pipe, the oil outlet of the oil pipe is fixedly connected to the oil inlet of the pressure transmitter, a four-way joint is provided on one side of the oil outlet of the pressure transmitter, the oil outlet of the pressure transmitter is fixedly connected to the fourth interface of the four-way joint, the fifth interface and the sixth interface of the four-way joint are fixedly connected to the fifth valve and the sixth valve respectively, and a seventh valve is fixedly provided on the seventh interface of the four-way joint.

6. The circulating cooling method for a Roots blower with a dual oil pump circulating cooling device according to claim 5, characterized in that: The first and second one-way valves are respectively provided on the oil outlets of the first oil pump and the second oil pump, and the oil outlets of the first and second oil pumps are respectively fixedly connected to the oil inlets of the first and second one-way valves, and the first and second one-way valves are respectively fixedly connected to the second interface and the first interface on the three-way joint on one side of the oil outlets of the first and second oil pumps, the third interface is fixedly connected to one end of the oil pipe, a four-way joint is provided between the other end of the oil pipe and the cooler, the oil pipe is fixedly connected to the fourth interface of the four-way joint, the first valve is fixedly connected to the fifth interface, the other end of the first valve is fixedly connected to the oil pipe, and the other end of the oil pipe is fixedly connected to the oil inlet of the oil tank, the eighth valve is fixedly connected to the sixth interface, and the seventh interface is fixedly connected to the oil inlet of the cooler.

7. The circulating cooling method for a Roots blower with a dual oil pump circulating cooling device according to claim 4, characterized in that: The driving end oil pipe assembly includes a fourth driving end oil pipe, one end of the fourth driving end oil pipe is fixedly connected to the fifth interface on the four-way joint on one side of the oil outlet of the cooler, the other end of the fourth driving end oil pipe is connected to the third valve, the other end of the third valve is connected to the driving end filter, the other end of the driving end filter is provided with a three-way joint, the driving end filter is fixedly connected to the first interface of the three-way joint, the second interface and the third interface of the three-way joint are respectively provided with a flow indicator, the second interface and the third interface are respectively fixedly connected to the oil inlet of the flow indicator, and the two The oil outlets of the flow indicators are respectively connected to the first oil pipe at the driving end and the second oil pipe at the driving end. The lubricating oil circuit on the driving end wall panel includes the first lubricating oil circuit and the second lubricating oil circuit. The other ends of the first oil pipe at the driving end and the second oil pipe at the driving end are respectively fixedly connected to one end of the first lubricating oil circuit and the second lubricating oil circuit. The other ends of the first lubricating oil circuit and the second lubricating oil circuit are respectively connected to oil pipes. The other sides of the two oil pipes are respectively aligned with the bearing positions of the driving ends of the active impeller and the driven impeller inside the Roots blower, so as to realize precise oil injection lubrication and temperature reduction cooling of the bearings at the driving end.

8. The circulating cooling method for a Roots blower with a dual oil pump circulating cooling device according to claim 4, characterized in that: The gear end oil pipe assembly includes a first oil pipe at the gear end, one end of the first oil pipe at the gear end is fixedly connected to the sixth interface on the four-way joint on one side of the oil outlet of the cooler, the other end of the first oil pipe at the gear end is provided with a flow indicator, the first oil pipe at the gear end is fixedly connected to the oil inlet of the flow indicator, a three-way joint is provided on one side of the oil outlet of the flow indicator, the oil outlet of the flow indicator is fixedly connected to the first interface of the three-way joint, a fourth valve is connected to the second interface of the three-way joint, the other end of the fourth valve is connected to a pressure gauge, the lubricating oil circuit on the non-driving end wall panel includes a fifth lubricating oil circuit, the third interface of the three-way joint is fixedly connected to one end of the fifth lubricating oil circuit, the other end of the fifth lubricating oil circuit is connected to an oil pipe, and the other side of the oil pipe is respectively aligned with the driving gear and the driven gear position inside the Roots blower to achieve precise oil injection lubrication and temperature reduction cooling of the driving gear and the driven gear.

9. The circulating cooling method for a Roots blower with a dual oil pump circulating cooling device according to claim 8, characterized in that: The oil pipe on one side of the fifth lubricating oil circuit is T-shaped, and a plurality of oil outlet holes are arranged at one end of the T-shaped oil pipe away from the fifth lubricating oil circuit. The plurality of oil outlet holes are arranged in a line and are respectively aligned with the driving gear and the driven gear, so as to realize precise oil injection lubrication and cooling for the driving gear and the driven gear respectively.

10. The circulating cooling method for a Roots blower with a dual oil pump circulating cooling device according to claim 4, characterized in that: The non-driving end oil pipe assembly includes a non-driving end fourth oil pipe, one end of the non-driving end fourth oil pipe is fixedly connected to the seventh interface on the four-way joint on one side of the oil outlet of the cooler, the other end of the non-driving end fourth oil pipe is connected to the second valve, the other end of the second valve is connected to the non-driving end filter, the other end of the non-driving end filter is provided with a three-way joint, the non-driving end filter is fixedly connected to the first interface of the three-way joint, the second interface and the third interface of the three-way joint are respectively provided with a flow indicator, and the second interface and the third interface are respectively fixedly connected to the oil inlet of the flow indicator, The oil outlets of the two flow indicators are respectively connected to the first oil pipe at the non-driving end and the second oil pipe at the non-driving end. The lubricating oil circuit on the non-driving end wall panel also includes a third lubricating oil circuit and a fourth lubricating oil circuit. The first oil pipe at the non-driving end and the second oil pipe at the non-driving end are respectively fixedly connected to one end of the third lubricating oil circuit and the fourth lubricating oil circuit. The other ends of the third lubricating oil circuit and the fourth lubricating oil circuit are respectively connected to oil pipes. The other sides of the two oil pipes are respectively aligned with the bearing positions of the non-driving ends of the active impeller and the driven impeller inside the Roots blower, so as to realize precise oil injection lubrication and temperature reduction cooling of the bearings at the non-driving end.

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