A high speed rotating centrifugal atomizer device

Abstract

The application provides a high-speed rotating centrifugal atomizer device, which comprises a shell, a lubricating system arranged on the shell, an atomizing disc arranged on the lower side of the shell and a driving device connected with the atomizing disc; the driving device comprises a main shaft, a rotor fixedly connected with the main shaft and a stator arranged on the inner side of the shell; the main shaft is connected with the atomizing disc; the shell comprises a shell middle section, a shell upper cover arranged on the upper side of the shell middle section and a shell lower cover arranged on the lower side of the shell middle section; a support plate is arranged on the outer side of the shell middle section; the inner side of the shell middle section is a stator cavity; a lubricating oil cavity is arranged on the outer side of the shell middle section; and a cold water cavity is arranged on the outer side of the lubricating oil cavity; the stator is arranged in the stator cavity; and the rotor and the stator are arranged in cooperation; the application has the characteristics of fully utilizing space, quickly reducing the temperature of lubricating oil, ensuring good lubricating effect and realizing super-high-speed rotating centrifugation.

Description

Technical Field

[0001] This invention relates to a high-speed rotating centrifugal atomizer device, belonging to the technical field of high-speed atomizers. Background Technology

[0002] With the rise of waste-to-energy in China and the widespread construction of waste-to-energy plants in recent years, rotary atomizers have been increasingly widely used. Rotary atomizers are key equipment for purifying exhaust gases from waste-to-energy plants; their atomization performance directly affects the quality of exhaust gas emissions and the utilization rate of the absorbent, and is crucial for determining whether the exhaust gas emission indicators of waste-to-energy plants meet domestic and international standards. Currently, the rotary atomizers used in China mainly rely on imports, incurring significant foreign exchange expenditures annually. With the development of modern industrialization, the localization of rotary atomizer production has received increasing attention from manufacturers.

[0003] Existing high-speed centrifugal atomizers on the market generally use a high-speed motor directly connected to the atomizing disc via a coupling for atomization. The disadvantages are high friction, high heat generation, and a complex lubrication system, which makes it difficult to increase the motor power at high speeds. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a high-speed rotating centrifugal atomizer device with a reasonable structural design, which makes full use of space, can quickly reduce the temperature of lubricating oil, ensure good lubrication effect, and thus achieve ultra-high speed rotating centrifugation.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0006] A high-speed rotating centrifugal atomizer device includes a housing, a lubrication system disposed on the housing, an atomizing disc disposed on the lower side of the housing, and a drive device connected to the atomizing disc;

[0007] The drive device includes a main shaft, a rotor fixedly connected to the main shaft, and a stator disposed inside the housing;

[0008] The main shaft is connected to the atomizing disk.

[0009] Furthermore, the housing includes a housing middle section, a housing upper cover disposed on the upper side of the housing middle section, and a housing lower cover disposed on the lower side of the housing middle section;

[0010] A support plate is provided on the outer side of the middle section of the shell;

[0011] The inner side of the middle section of the housing is a stator cavity, the outer side of the middle section of the housing is a lubricating oil cavity, and the outer side of the lubricating oil cavity is a cold water cavity;

[0012] The stator is disposed within the stator cavity, and the rotor is configured to cooperate with the stator;

[0013] The upper cover of the housing is provided with a cooling water inlet and a cooling water outlet;

[0014] An oil pipe opening is provided on the upper cover of the housing.

[0015] Furthermore, an inlet water flow sensor is installed at the cooling water inlet, and an outlet water flow sensor is installed at the cooling water outlet.

[0016] Furthermore, the lubrication system includes an oil pump mounted on the housing, a motor connected to the oil pump, a three-way valve communicating with the oil pump outlet, a first oil pump outlet communicating with the three-way valve, a second oil pump outlet communicating with the three-way valve, and an oil inlet pipeline connected to the oil pump.

[0017] Furthermore, an upper bearing assembly is provided on the upper side of the main shaft, and a lower bearing is provided on the lower side of the main shaft. The outlet of the first oil pump is located at the upper bearing assembly, and the outlet of the second oil pump is located at the lower bearing.

[0018] Furthermore, the upper bearing assembly includes a bearing housing disposed on the upper cover of the housing, an upper bearing disposed within the bearing housing, and a bearing cover disposed on the bearing housing, wherein a pressure oil chamber is provided between the main shaft and the bearing housing and the bearing cover.

[0019] Furthermore, the lower bearing is located below the lower cover of the housing, and a lubricating oil tank is provided on the lower side of the lower cover of the housing, with the oil inlet pipe connected to the lubricating oil tank.

[0020] Furthermore, a first labyrinth seal is provided between the lower bearing and the lubricating oil tank.

[0021] Furthermore, a check valve is installed on the lower side of the oil inlet pipeline.

[0022] Furthermore, a first lubricating oil flow sensor is installed at the outlet of the first oil pump, and a second lubricating oil flow sensor is installed at the outlet of the second oil pump.

[0023] The beneficial effects of adopting the above technical solution are as follows:

[0024] The high-speed rotating centrifugal atomizer device involved in this invention features a more optimized lubrication system for the high-speed rotating atomizer. It employs a stator and rotor to drive the atomizing disk on the main shaft to rotate, enabling a rotation speed of up to 20,000 rpm. The accompanying splash lubrication system is simple, and the water cooling system significantly reduces the lubricating oil temperature.

[0025] The entire outer shell of this invention features an integrated design that is rational and makes full use of space. It connects the large-capacity water-cooled box and the oil tank, which surround the stator cavity for cooling. The outer side of the oil tank is fully covered by the water-cooled box, resulting in a larger contact surface that can quickly reduce the temperature of the lubricating oil and extend the service life of the bearing. A support plate is set on the outer side of the middle section of the shell to connect the outer side plate of the lubricating oil cavity and the outer side plate of the water-cooled cavity. The welded connection is more robust, with stronger pressure resistance and sealing ability, and convenient positioning and installation.

[0026] This invention connects the lubricating oil tank to the oil pump via an oil pipe. After the oil pump draws lubricating oil from the lubricating oil tank, it distributes the lubricating oil to the upper and lower bearing assemblies on both sides of the stator cavity through a three-way valve for lubrication. The lubricating oil is cooled to ensure the lubrication effect. After providing lubrication to the upper bearing assembly, the lubricating oil flows into the lubricating oil chamber, where it exchanges heat with the cooling water in the outer cold water chamber to cool the lubricating oil before flowing into the lubricating oil tank. The lubricating oil for the lower bearing flows into the lubricating oil tank after lubrication. The oil pump then draws the lubricating oil from the lubricating oil tank, continuously circulating the lubricating oil for cooling.

[0027] The present invention provides an inlet water flow sensor at the cooling water inlet and an outlet water flow sensor at the cooling water outlet, so as to trigger an alarm and shut down the machine when there is no cooling water, in order to avoid losses.

[0028] The oil inlet pipe of the present invention is provided with a one-way valve on the lower side. The one-way valve is located at the outlet of the lubricating oil tank, and the lubricating oil can only flow from bottom to top.

[0029] The present invention provides a first lubricating oil flow sensor at the outlet of the first oil pump and a second lubricating oil flow sensor at the outlet of the second oil pump. If there is no oil in either pump, an alarm will be triggered, requiring the machine to be stopped and the fault checked.

[0030] The invention provides a first labyrinth seal between the lower bearing and the lubricating oil tank, which can prevent the lubricating oil from leaking out of the bearing and also prevent backfill material from entering the bearing assembly and causing equipment damage when the feed rate is too high. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the present invention;

[0032] Figure 2 This is a schematic cross-sectional view of the present invention;

[0033] Figure 3 This is a top view of the structure of the present invention;

[0034] Figure 4 This is a top sectional view of the structure of the present invention;

[0035] Figure 5 This is a schematic cross-sectional view of the housing structure of the present invention;

[0036] Figure 6 This is a schematic diagram of the spindle mounting structure of the present invention;

[0037] The components are as follows: 1. Housing; 2. Oil pump; 3. Motor; 4. Lifting ring; 5. Three-way valve; 6. Lower bearing; 7. Check valve; 8. Atomizing disc; 9. Oil suction port; 10. Lubricating oil tank; 11. First labyrinth seal; 12. Feed inlet; 13. Main shaft; 14. Bearing inner sleeve; 15. Ventilation device; 16. Rotor; 17. Stator; 18. Inlet water flow sensor; 19. Outlet water flow sensor; 20. First oil pump outlet; 21. Second oil pump outlet; 22. Oil inlet pipeline; 23. 101. First lubricating oil flow sensor; 24. Second lubricating oil flow sensor; 25. Second labyrinth seal; 26. Anti-backflow disc; 101. Middle section of housing; 102. Upper cover of housing; 103. Lower cover of housing; 104. Support plate; 105. Stator cavity; 106. Lubricating oil cavity; 107. Cold water cavity; 108. Cooling water inlet; 109. Cooling water outlet; 110. Oil pipe port; 201. Bearing housing; 202. Upper bearing; 203. Bearing cover; 204. Waveform washer. Detailed Implementation

[0038] The invention will now be further described with reference to the accompanying drawings.

[0039] As attached Figure 1-6 As shown, this embodiment provides a high-speed rotating centrifugal atomizer device, which includes a housing 1, a lubrication system disposed on the housing 1, an atomizing disk 8 disposed on the lower side of the housing 1, and a drive device connected to the atomizing disk 8; the drive device includes a main shaft 13, a rotor 16 fixedly connected to the main shaft 13, and a stator 17 disposed inside the housing 1; the main shaft 13 is drivenly connected to the atomizing disk 8. After the AC power is turned on, the rotor 16 drives the main shaft 13 to achieve high-speed rotation, and drives the atomizing disk 8 on the lower side of the atomizer to achieve high-speed rotation. The operating principle of the rotor 16 and the stator 17 is similar to that of an electric motor. Its structural design is reasonable, eliminating components such as high-speed motors and speed-increasing gearboxes, reducing the footprint, lowering equipment costs, and increasing the rotational speed of the atomizing disk 8, thereby achieving a better atomization effect.

[0040] The housing 1 includes a housing middle section 101, a housing upper cover 102 disposed on the upper side of the housing middle section 101, and a housing lower cover 103 disposed on the lower side of the housing middle section 101; a support plate 104 is disposed on the outer side of the housing middle section 101; the support plate 104 is provided with lubricating oil passage holes and cooling water passage holes to ensure uniform cooling of the lubricating oil surrounding the rotor cavity, thereby ensuring the lubrication effect; the inner side of the housing middle section 101 is a stator cavity 105, the outer side of the housing middle section 101 is provided with a lubricating oil cavity 106, and the outer side of the lubricating oil cavity 106 is provided with a cooling water cavity 107; the stator 17 is disposed in the stator cavity 105, and the rotor 16 and the stator 17 are fitted together; a cooling water inlet is provided on the housing upper cover 102. 108 and cooling water outlet 109; an oil pipe inlet 110 is provided on the upper cover 102 of the housing; the entire housing is integrated in design, which is reasonable and makes full use of space, connecting the large-capacity cold water chamber 107 and the lubricating oil chamber 106 to surround the stator cavity 105 for cooling. The lubricating oil chamber 106 completely covers the cold water chamber 107, with a larger contact surface, which can quickly reduce the temperature of the lubricating oil, ensure effective lubrication, and thus extend the service life of the bearing. A support plate 104 is provided on the outer side of the middle section 101 of the housing. The support plate 104 is used to connect the outer side plate of the lubricating oil chamber 106 and the outer side plate of the cold water chamber 107 installed on the outside. The connection is made by welding, which makes the connection more solid, with stronger pressure bearing capacity and sealing capacity, and convenient for positioning and installation.

[0041] The present invention provides an inlet water flow sensor 18 at the cooling water inlet 108 and an outlet water flow sensor 19 at the cooling water outlet 109, so that an alarm will be triggered and the machine will be shut down when there is no cooling water to avoid losses.

[0042] The lubrication system includes an oil pump 2 mounted on the housing 1, a motor 3 connected to the oil pump 2, a three-way valve 5 connected to the outlet of the oil pump 2, and an oil inlet pipe 22 connected to the oil pump 2. One end of the three-way valve 5 is connected to the first oil pump outlet 20. An upper bearing assembly is installed on the upper side of the main shaft 13, and a lower bearing 6 is installed on the lower side of the main shaft 13. The first oil pump outlet 20 is located at the upper bearing assembly and provides lubricating oil to the upper bearing assembly. The other end of the three-way valve 5 is connected to the second oil pump outlet 21, which is located at the lower bearing 6 and provides lubricating oil to the lower bearing 6. The lubricating oil tank 10 is connected to the oil inlet of the oil pump 2 through the oil inlet pipe 22. After the oil pump 2 draws lubricating oil from the lubricating oil tank 10, the lubricating oil is distributed and delivered to the stator cavity through the three-way valve 5. The upper bearing assembly and lower bearing 6 on both sides of 105 are lubricated using cooled lubricating oil to ensure lubrication effect. After the lubricating oil provides lubrication to the upper bearing assembly, it flows into the lubricating oil chamber 106, where it exchanges heat with the cooling water in the outer cold water chamber 107 to cool the lubricating oil. After cooling, the lubricating oil flows into the lubricating oil tank 10. The lubricating oil of the lower bearing 6 flows into the lubricating oil tank 10 after lubrication. The oil pump 2 then draws the lubricating oil from the lubricating oil tank 10, continuously circulating for lubrication and cooling. This invention optimizes the lubrication system of the high-speed rotating atomizer and uses the stator 17 and rotor 16 to drive the atomizing disk 8 on the main shaft 13 to rotate, so that the speed can reach 20,000 rpm. The matching splash lubrication system is simple, and the water cooling system significantly reduces the lubricating oil temperature.

[0043] The upper bearing assembly includes a bearing seat 201 mounted on the upper cover 102 of the housing, an upper bearing 202 mounted inside the bearing seat 201, and a bearing cap 203 mounted on the bearing seat 201. There are two sets of upper bearings 202. A pressure oil chamber is provided between the main shaft 13 and the bearing seat 201 and the bearing cap 203. A bearing inner sleeve 14 is provided on the upper side of the main shaft 3. The upper bearings 202 are mounted on the bearing inner sleeve 14. The bearing inner sleeve 14 is located above the bearing seat 201 and below the bearing cap 203. A corrugated washer 204 is provided between the upper bearing 202 and the bearing cap 203 located on the upper side. The corrugated washer 204 is a corrugated elastic washer that can move radially to balance vibration. A pressure oil chamber is provided between the main shaft 13, the bearing housing 201, and the bearing cap 203. The pressure oil chamber functions similarly to a lubricating oil tank and can also store a certain amount of lubricating oil. The bearing used in this invention is a 6208 deep groove ball bearing. During operation, pressure oil is filled into the chamber. The pressure oil is lubricating oil, which forms a "film" between the main shaft surface and its supporting surface. This film, composed of pressure oil with equal pressure in all directions, supports the shaft to the center. When the main shaft is subjected to a radial force, the gap of this film changes, causing the pressure of the oil on the main shaft to change accordingly, thus attempting to maintain the main shaft in its original axial position. The four sides of the main shaft do not directly contact the supporting surface, similar to "floating" in the middle of the bearing. This design is suitable for high-speed, low-load applications and has good stability. This invention improves the main shaft mounting structure by using three sets of bearings combined with the principle of floating deep groove ball bearings. This allows the radial thermal deformation of the main shaft to be released when the temperature rises during high-speed operation, reducing wear on the bearings. Furthermore, the axial force is uniform, making the main shaft less prone to breakage.

[0044] A second labyrinth seal 25 is provided on the outside of the main shaft 13. The second labyrinth seal 25 is located between the housing cover 102 and the bearing seat 201 to prevent pressurized oil from overflowing into the stator cavity 105.

[0045] A lower bearing 6 is provided on the lower side of the main shaft 13. The lower bearing 6 and the upper bearing 202 are combined to form a shaft-to-shaft bearing, that is, the lower bearing 6 and the upper bearing 202 are coaxially arranged and separately to provide support for the main shaft 13. A stator 17 is provided in the stator cavity 105. A rotor 16 is provided on the main shaft 13 and is configured to cooperate with the stator 17. After the AC power is turned on, the rotor 16 drives the main shaft 13 to rotate at high speed, and drives the atomizing disk 8 on the lower side of the atomizer to rotate at high speed. The lower bearing 6 is located below the lower cover 103 of the housing. A lubricating oil tank 10 is provided on the lower side of the lower cover 103 of the housing. An oil suction port 9 is provided in the lubricating oil tank 10. The oil inlet pipe 22 is connected to the oil suction port 9 of the lubricating oil tank 10. The lubricating oil tank 10 is mainly used to collect lubricating oil after lubrication and cooling, and then provide it to the bearing for effective lubrication through the oil pump 2.

[0046] A first labyrinth seal 11 is provided between the lower bearing 6 and the lubricating oil tank 10, which can effectively prevent the lubricating oil in the lubricating oil tank 10 from leaking. It can also prevent backflow into the bearing assembly and damage to the equipment when the feed rate is too high. An anti-backflow disc 26 is provided on the lower side of the lubricating oil tank 10 to prevent material from spiraling up along the central rotating shaft and entering the lubricating oil tank 10 when the atomizer is overloaded, thereby preventing damage to the equipment.

[0047] A one-way valve 7 is installed on the lower side of the oil inlet pipe 22. The one-way valve 7 is located at the outlet of the lubricating oil tank 10, and the lubricating oil can only flow from bottom to top.

[0048] A first lubricating oil flow sensor 23 is installed at the outlet 20 of the first oil pump, and a second lubricating oil flow sensor 24 is installed at the outlet 21 of the second oil pump. If there is no oil in either line, an alarm will be triggered, and the machine needs to be stopped to check for faults.

[0049] The support plate 104 of the present invention is provided with a lubricating oil passage hole and a cooling water passage hole, so that the lubricating oil and cooling water can flow and communicate separately to ensure the cooling effect and thus ensure the lubrication effect.

[0050] The housing cover 102 is provided with a feed inlet 12, which is welded to a stainless steel tube running from top to bottom. The stainless steel tube serves as a material conveying channel, allowing materials to be atomized to be added through the feed inlet 12. The material is then conveyed to the atomizing disc 8 driven by the main shaft 13 for atomization. This design is more rational, occupies less space, and eliminates the need for a separate feed pipe on the outside of the housing. The housing cover 102 is also provided with an oil pipe opening 110, through which the pipes connecting to the oil pump 2's inlet and outlet pass. The housing 1 is also provided with a lifting ring 4 for easy installation and fixation of the atomizer device. The lubricating oil tank 10 is connected to a venting device 15, through which internal air is expelled, maintaining the normal operation of the lubrication and cooling system.

[0051] The specific installation and operation process is as follows:

[0052] After the middle section 101 of the housing is machined, a fixed support plate 104 is welded to the outside of the middle section 101. Then, the side plate on the outside of the lubricating oil cavity 106 is welded. After welding, an airtightness test is performed. The test pressure is 0.3 MPa and the test time is 30 minutes. If there is no leakage, the side plate on the outside of the outer water cooling cavity 107 is welded. The airtightness test is the same as the previous step. Rough machining is then performed. Then, the upper cover 102 and the lower cover 103 of the housing are welded. After the airtightness test, rough machining is performed again. After rough machining, aging treatment is performed, usually after low-temperature tempering (low-temperature tempering temperature 150-250°C). Before finishing, the workpiece is reheated to 100-150℃ and held for 20 hours to eliminate residual stress and stabilize the steel structure and dimensions before finishing. In this invention, adjacent lubricating oil chambers 106 are connected through lubricating oil through holes on the support plate 104, and adjacent cold water chambers 107 are connected through cooling water through holes on the support plate 104. The lubricating oil chamber 106 surrounds the stator chamber 105, and the cold water chamber 107 surrounds the lubricating oil chamber 106. The surrounding arrangement increases the contact area, effectively utilizes space, and can significantly cool the lubricating oil, thereby increasing the service life of the bearing.

[0053] After the AC power is turned on, the rotor 16 drives the main shaft 13 to rotate at high speed, and drives the atomizing disk 8 on the lower side of the atomizer to rotate at high speed. The speed can reach 20,000 revolutions per minute through the customized stator 16 and rotor 17. At the high-speed spindle 13, the material falls from the feed inlet 12 and is atomized into 30-50μm particles by the centrifugal force of the atomizing disc 8. At the same time, the oil pump 2 draws lubricating oil from the lubricating oil tank 10 and distributes it to the upper bearing assembly and lower bearing 6 on both sides of the stator cavity 105 through the three-way valve 5 for lubrication. After providing lubrication to the upper bearing assembly, the lubricating oil flows into the lubricating oil chamber 106, where it exchanges heat with the cooling water in the outer cold water chamber 107 to cool the lubricating oil before flowing into the lubricating oil tank 10. The lubricating oil in the lower bearing 6 flows into the lubricating oil tank 10 after lubrication. The oil pump 2 then draws the lubricating oil from the lubricating oil tank 10 again, continuously circulating for lubrication and cooling. The lubricating oil is cooled down to ensure the lubrication effect.

[0054] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-speed rotating centrifugal atomizer device, characterized in that, It includes a housing (1), a lubrication system disposed on the housing (1), an atomizing disc (8) disposed on the lower side of the housing (1), and a drive device connected to the atomizing disc (8); The drive device includes a main shaft (13), a rotor (16) fixedly connected to the main shaft (13), and a stator (17) disposed inside the housing (1). The main shaft (13) is connected to the atomizing disk (8); The housing (1) includes a housing middle section (101), a housing upper cover (102) disposed on the upper side of the housing middle section (101), and a housing lower cover (103) disposed on the lower side of the housing middle section (101). A support plate (104) is provided on the outer side of the middle section (101) of the shell. The inner side of the middle section (101) of the housing is a stator cavity (105), the outer side of the middle section (101) of the housing is provided with a lubricating oil cavity (106), and the outer side of the lubricating oil cavity (106) is provided with a cold water cavity (107). The stator (17) is disposed in the stator cavity (105), and the rotor (16) is disposed in conjunction with the stator (17); The housing cover (102) is provided with a cooling water inlet (108) and a cooling water outlet (109). An oil pipe opening (110) is provided on the upper cover (102) of the housing.

2. The high-speed rotating centrifugal atomizer device according to claim 1, characterized in that, An inlet water flow sensor (18) is provided at the cooling water inlet (108), and an outlet water flow sensor (19) is provided at the cooling water outlet (109).

3. The high-speed rotating centrifugal atomizer device according to claim 1, characterized in that, The lubrication system includes an oil pump (2) mounted on a housing (1), a motor (3) connected to the oil pump (2), a three-way valve (5) connected to the outlet of the oil pump (2), a first oil pump outlet (20) connected to the three-way valve (5), a second oil pump outlet (21) connected to the three-way valve (5), and an oil inlet pipeline (22) connected to the oil pump (2).

4. The high-speed rotating centrifugal atomizer device according to claim 3, characterized in that, An upper bearing assembly is provided on the upper side of the main shaft (13), and a lower bearing (6) is provided on the lower side of the main shaft (13). The first oil pump outlet (20) is located at the upper bearing assembly, and the second oil pump outlet (21) is located at the lower bearing (6).

5. The high-speed rotating centrifugal atomizer device according to claim 4, characterized in that, The upper bearing assembly includes a bearing housing (201) disposed on the upper cover (102) of the housing, an upper bearing (202) disposed in the bearing housing (201), and a bearing cap (203) disposed on the bearing housing (201). A pressure oil chamber is provided between the main shaft (13) and the bearing housing (201) and the bearing cap (203).

6. The high-speed rotating centrifugal atomizer device according to claim 4, characterized in that, The lower bearing (6) is located below the lower cover (103) of the housing. A lubricating oil tank (10) is provided on the lower side of the lower cover (103), and the oil inlet pipe (22) is connected to the lubricating oil tank (10).

7. The high-speed rotating centrifugal atomizer device according to claim 6, characterized in that, A first labyrinth seal (11) is provided between the lower bearing (6) and the lubricating oil tank (10).

8. The high-speed rotating centrifugal atomizer device according to claim 3, characterized in that, A check valve (7) is installed on the lower side of the oil inlet pipe (22).

9. A high-speed rotating centrifugal atomizer device according to claim 3, characterized in that, A first lubricating oil flow sensor (23) is installed at the outlet (20) of the first oil pump, and a second lubricating oil flow sensor (24) is installed at the outlet (21) of the second oil pump.

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