Oil mist lubrication system of horizontal rotary jet pump

Abstract

The invention relates to an oil mist lubrication system of a horizontal rotary jet pump, and belongs to the technical field of rotary jet pumps, the oil mist lubrication system comprises a bearing box, a bearing end cover, an impeller, a sealing cover and a flow guide assembly, the bearing end cover is fixedly arranged at the end of the bearing box, the impeller is arranged in an impeller cavity, and the flow guide assembly is used for conveying a medium; the pump further comprises a pump shaft, a front bearing and a rear bearing, and the pump shaft is rotationally arranged in the bearing box through the front bearing and the rear bearing; the lubricating system further comprises a first oil mist lubricating pipeline, a second oil mist lubricating pipeline and a lubricating oil mist oil return pipeline. The first oil mist lubricating pipeline is used for cooling the front bearing, penetrates through the front bearing from the outer side of the front bearing and then enters the bearing box from the rear side of the front bearing; the second oil mist lubricating pipeline is used for cooling the rear bearing, enters the rear bearing from the side, close to the bearing end cover, of the rear bearing and enters the bearing box; and the lubricating oil mist return pipeline conveys the cooled lubricating oil mist back to the oil storage tank. The bearing lubricating device has the advantage that the bearing lubricating effect is improved.

Description

Technical Field

[0001] This application relates to the field of rotary jet pump technology, and in particular to an oil mist lubrication system for a horizontal rotary jet pump. Background Technology

[0002] A rotary jet pump is a special high-speed centrifugal pump based on the principle of Pitot tubes. It uses a high-speed rotating casing to drive the liquid to form a liquid ring with high kinetic energy. A stationary manifold (Pitto tube) extends into this liquid ring to intercept the high-speed fluid and convert the kinetic energy of the fluid into static pressure energy in the manifold, thereby realizing the liquid transportation.

[0003] Reference Figure 1 Reliable lubrication and sealing of the drive-end bearings in horizontal rotary jet pumps are crucial for ensuring long-term stable operation. Currently, the main lubrication methods for bearings are grease lubrication and lubricating oil splash lubrication.

[0004] Disadvantages: Grease lubrication is prone to deterioration and loss under high-speed and high-temperature conditions, resulting in poor bearing cooling and shortened lifespan. Oil splash lubrication, in complex sealed structures, carries the risk of oil leakage. Leaked oil not only pollutes the environment but can also easily ignite at high temperatures, causing safety accidents. In the retrofitting of high-risk pumps, pumps transporting high-temperature media and flammable / explosive media are converted from oil splash lubrication to oil mist lubrication. However, due to structural limitations, rotary jet pumps cannot use oil mist lubrication (requiring the oil mist to pass through the bearing to ensure lubrication), thus restricting their application scenarios. Summary of the Invention

[0005] To improve the lubrication effect on bearings, this application provides an oil mist lubrication system for a horizontal rotary jet pump.

[0006] The oil mist lubrication system for a horizontal rotary jet pump provided in this application adopts the following technical solution: An oil mist lubrication system for a horizontal rotary jet pump includes a bearing housing, a bearing end cover, an impeller, a sealing cover, and a flow guiding assembly. The bearing end cover is fixedly disposed at the end of the bearing housing. The sealing cover covers the end of the bearing end cover and forms an impeller cavity inside the bearing end cover. The impeller is disposed inside the impeller cavity. The flow guiding assembly is used to transport the medium. It also includes a pump shaft, which is rotatably mounted inside a bearing housing and passes through the bearing end cover to enter the impeller cavity, with the impeller mounted on the pump shaft; It also includes a front bearing and a rear bearing, both of which are embedded in a bearing housing, and the pump shaft is rotatably mounted in the bearing housing via the front bearing and the rear bearing; It also includes a first oil mist lubrication pipeline, a second oil mist lubrication pipeline, and a lubricating oil mist return pipeline; The first oil mist lubrication line is used to cool the front bearing. The first oil mist lubrication line starts from the outside of the front bearing, passes through the front bearing, and then enters the bearing housing from the rear side of the front bearing. The second oil mist lubrication line is used to cool the rear bearing. The second oil mist lubrication line enters the rear bearing from the side of the rear bearing near the bearing end cover and then enters the bearing housing. The lubricating oil mist return pipeline is connected to the bottom of the bearing housing and transports the cooled lubricating oil mist back to the oil storage tank.

[0007] Optionally, the first oil mist lubrication pipeline includes a first pipeline connected to an oil reservoir and a first oil inlet channel opened in the bearing housing. The first oil inlet channel is L-shaped, the vertical pipeline of the first oil inlet channel is connected to the first pipeline, and the oil outlet end of the horizontal pipeline of the first oil inlet channel faces the outside of the front bearing.

[0008] Optionally, the second oil mist lubrication pipeline includes a second pipeline connected to the oil reservoir and a second oil inlet channel. The second oil inlet channel includes a first channel, a second channel, a third channel, and a fourth channel. The first channel and the second channel are opened on the inner wall of the bearing housing. The first channel is opened vertically, and the second channel is opened horizontally. The first channel and the second channel are connected. The third channel is opened from the end of the bearing housing toward the front bearing and is formed by the side of the third channel being closed by the bearing end cover. The third channel is vertically arranged and also includes a sealing component. The sealing component is sleeved on the pump shaft and seals the gap between the bearing end cover and the pump shaft. The fourth channel is formed by the gap between the rear bearing and the sealing component. After passing through the first channel, the second channel, the third channel, and the fourth channel, the oil mist passes through the rear bearing and returns to the bearing housing.

[0009] Optionally, the sealing component includes a first bearing protector, which is sleeved on the pump shaft and then fixed to the bearing end cover. The first bearing protector is located on the side of the rear bearing near the bearing end cover, and a gap is left between the rear bearing and the first bearing protector to form a fourth channel. The first bearing protector is first assembled on the bearing end cover, then the bearing end cover is assembled on the bearing housing, and then the pump shaft with the rear bearing is assembled into the bearing housing and the pump shaft is assembled into the first bearing protector.

[0010] Optionally, a second bearing protector is fitted on the pump shaft. The second bearing protector is located on the side of the front bearing away from the rear bearing and on the outside of the bearing housing. After the pump shaft enters the bearing housing, the second bearing protector is fitted onto the pump shaft and then fixed to the side wall of the bearing housing.

[0011] Optionally, the bearing end cover has an oil mist stop groove on the side facing the bearing housing. The oil mist stop groove is opened along the axis of the pump shaft and is annular. A sealing ring is provided on the bearing end cover through the oil mist stop groove.

[0012] Optionally, an oil mist generator is also included. The oil mist generator is installed on the oil reservoir. The first oil mist lubrication pipeline and the second oil mist lubrication pipeline are respectively connected to the oil mist generator. The oil mist generator mixes and atomizes compressed air and lubricating oil, and then injects it into the front bearing and the rear bearing through the first oil mist lubrication pipeline and the second oil mist lubrication pipeline. Then, it enters the bearing housing, and the cooled liquid lubricating oil is transported to the oil reservoir through the lubricating oil mist return pipeline.

[0013] Optionally, the bearing housing is provided with a suction element, which is used to generate suction on the rear side of the front and rear bearings to push the lubricating oil mist on the front side of the front and rear bearings through the front and rear bearings for lubrication and cooling.

[0014] Optionally, the suction element includes two miniature fan blades disposed on the pump shaft, which are respectively located near the rear side of the front bearing and the rear bearing.

[0015] Optionally, the suction element includes a cooling plate disposed in the bearing housing. After the lubricating oil mist passing through the front and rear bearings is cooled and liquefied by the cooling plate, the air pressure in the bearing housing decreases, thereby pushing the lubricating oil mist through the front and rear bearings.

[0016] In summary, this application includes at least one of the following beneficial technical effects: When the rotary jet pump is in use, the oil mist generator atomizes the lubricating oil into a lubricating oil mist, which is then introduced into the bearing housing through a first oil mist lubrication line and a second oil mist lubrication line. The first oil mist lubrication line introduces the lubricating oil mist into the front of the front bearing, passes through the interior of the front bearing, and then exits from the rear of the front bearing into the bearing housing. The second oil mist lubrication line introduces the lubricating oil mist into the front of the rear bearing, passes through the interior of the rear bearing, and then exits from the rear bearing into the bearing housing. During this process, the bearing is lubricated by oil mist through a special flow channel design. In conjunction with the bearing protector, this not only ensures good lubrication but also reduces the risk of lubricating oil leakage.

[0017] The bearing protector acts as a sealant for the bearing housing, thereby reducing the risk of lubricating oil leakage. Attached Figure Description

[0018] Figure 1 This is a structural diagram of the related technology; Figure 2 This is a schematic diagram of the overall structure of an oil mist lubrication system for a horizontal rotary jet pump according to an embodiment of this application; Figure 3This is a schematic diagram of the bearing housing structure in an oil mist lubrication system of a horizontal rotary jet pump according to an embodiment of this application; Figure 4 yes Figure 3 An enlarged schematic diagram of part A in the middle; Figure 5 yes Figure 3 Enlarged diagram of part B.

[0019] Explanation of reference numerals in the attached drawings: 1. Bearing housing; 2. Bearing end cover; 3. Impeller; 4. Seal; 5. Flow guide assembly; 6. Impeller cavity; 7. Pump shaft; 8. Front bearing; 9. Rear bearing; 10. First oil mist lubrication pipeline; 101. First pipeline; 102. First oil inlet channel; 11. Second oil mist lubrication line; 111. Second line; 112. First channel; 113. Second channel; 114. Third channel; 115. Fourth channel; 12. Lubricating oil mist return pipeline; 13. First bearing protector; 14. Second bearing protector; 15. Sealing ring; 16. Suction component; 161. Miniature fan blade; 162. Cooling plate. Detailed Implementation

[0020] The following is in conjunction with the appendix Figure 2 -Appendix Figure 5 This application will be described in further detail.

[0021] This application discloses an oil mist lubrication system for a horizontal rotary jet pump. (Refer to...) Figure 2 The oil mist lubrication system of the horizontal rotary jet pump includes a bearing housing 1, a bearing end cover 2, an impeller 3, a cover 4, and a flow guiding assembly 5. The bearing end cover 2 is fixedly installed at the end of the bearing housing 1. The cover 4 covers the end of the bearing end cover 2 and forms an impeller cavity 6 inside the bearing end cover 2. The impeller 3 is installed inside the impeller cavity 6. The flow guiding assembly 5 is used to transport the medium. It also includes a pump shaft 7, which is rotatably mounted inside the bearing housing 1 and passes through the bearing end cover 2 to enter the impeller cavity 6. The impeller 3 is mounted on the pump shaft 7. It also includes a front bearing 8 and a rear bearing 9, both of which are embedded in the bearing housing 1. The pump shaft 7 is rotatably mounted in the bearing housing 1 via the front bearing 8 and the rear bearing 9. It also includes a first oil mist lubrication line 10, a second oil mist lubrication line 11, and a lubricating oil mist return line 12; The first oil mist lubrication line 10 is used to cool the front bearing 8. The first oil mist lubrication line 10 enters the bearing housing 1 from the outside of the front bearing 8, passes through the front bearing 8, and then enters the bearing housing 1 from the rear side of the front bearing 8. The second oil mist lubrication line 11 is used to cool the rear bearing 9. The second oil mist lubrication line 11 enters the rear bearing 9 from the side near the bearing end cover 2 and then enters the bearing housing 1. The lubricating oil mist return line 12 is connected to the bottom of the bearing housing 1 and transports the cooled lubricating oil mist back to the oil reservoir.

[0022] When the rotary jet pump is in use, the oil mist generator atomizes the lubricating oil into a lubricating oil mist, which is then introduced into the bearing housing 1 through the first oil mist lubrication pipe 10 and the second oil mist lubrication pipe 11. The first oil mist lubrication pipe 10 introduces the lubricating oil mist in front of the front bearing 8, passes through the interior of the front bearing 8, and then exits from behind the front bearing 8 into the bearing housing 1. The second oil mist lubrication pipe 11 introduces the lubricating oil mist in front of the rear bearing 9, passes through the interior of the rear bearing 9, and then exits into the bearing housing 1. During this process, the bearings are lubricated by oil mist through a special flow channel design. Combined with the bearing protector, this not only ensures good lubrication but also reduces the risk of lubricating oil leakage. Furthermore, the atomization of the lubricating oil increases the contact area between the lubricating oil and the front and rear bearings 8 and 9, thereby improving the lubrication effect and efficiency of the front and rear bearings 8 and 9.

[0023] Reference Figure 2 , Figure 3 and Figure 4 In this embodiment, the first oil mist lubrication pipeline 10 includes a first pipeline 101 connected to the oil reservoir and a first oil inlet channel 102 opened in the bearing housing 1. The first oil inlet channel 102 is L-shaped, and the vertical pipe of the first oil inlet channel 102 is connected to the first pipeline 101. The oil outlet end of the horizontal pipe of the first oil inlet channel 102 faces the outside of the front bearing 8. After the lubricating oil in the oil reservoir is atomized, the lubricating oil mist is injected into the front of the front bearing 8 through the first pipeline 101 and the first oil inlet channel 102. The lubricating oil mist passes through the interior of the front bearing 8 and moves out from the rear. During the process of the lubricating oil mist passing through the front bearing 8, it cools and lubricates the rollers inside the front bearing 8.

[0024] Reference Figure 2 , Figure 3 and Figure 5The second oil mist lubrication pipe 11 lubricates the rear bearing 9 and needs to enter the rear bearing 9 from the direction near the bearing end cover 2. However, the part of the second oil mist lubrication pipe 11 that enters the bearing housing 1 is surrounded by a sealing cover, and the installation space at this location is small, making it difficult to install the second oil mist lubrication pipe 11. Therefore, in this embodiment, the second oil mist lubrication pipe 11 includes a second pipe 111 communicating with the oil reservoir and a second oil inlet channel. The second oil inlet channel includes a first channel 112, a second channel 113, a third channel 114, and a fourth channel 115. The first channel 112 and the second channel 113 are opened on the inner wall of the bearing housing 1. The first channel 112 is opened vertically, the second channel 113 is opened horizontally, the first channel 112 and the second channel 113 are connected, the third channel 114 is opened from the end of the bearing housing 1 toward the front bearing 8 and the side of the third channel 114 is closed by the bearing end cover 2 to form a complete third channel 114. The third channel 114 is set vertically and also includes a sealing component. The sealing component is sleeved on the pump shaft 7 and seals the gap between the bearing end cover 2 and the pump shaft 7. The fourth channel 115 is formed by the gap between the rear bearing 9 and the sealing component. After passing through the first channel 112, the second channel 113, the third channel 114 and the fourth channel 115, the oil mist passes through the rear bearing 9 and returns to the bearing housing 1.

[0025] Reference Figure 3 and Figure 5 In this embodiment, the sealing component includes a first bearing protector 13, which is sleeved on the pump shaft 7 and then fixed to the bearing end cover 2. The first bearing protector 13 is located on the side of the rear bearing 9 near the bearing end cover 2, and a gap is left between the rear bearing 9 and the first bearing protector 13 to form a fourth channel 115. The first bearing protector 13 is first assembled onto the bearing end cover 2, then the bearing end cover 2 is assembled onto the bearing housing 1, and then the pump shaft 7 with the rear bearing 9 is assembled into the bearing housing 1 and the pump shaft 7 is assembled into the first bearing protector 13. According to the existing assembly process... First, the rear bearing 9 is installed on the pump shaft 7. Then, the pump shaft 7 is passed through the bearing end cover 2, and the bearing end cover 2 is fixed to the bearing housing 1. However, because there is no installation space inside the bearing housing 1, the rear bearing 9 is enclosed in a sealing cover, which makes it impossible to install the first bearing protector 13 on the pump shaft 7. Therefore, in this application, when installing the first bearing protector 13, the rear bearing 9 is first assembled on the pump shaft 7, and then the first bearing protector 13 is fixed to the bearing end cover 2 with bolts. Then, the pump shaft 7 is assembled in the bearing housing 1 and passes through the first bearing protector 13 and the bearing end cover 2 in sequence to complete the assembly of the first bearing protector 13.

[0026] Reference Figure 3 and Figure 4In this embodiment, a second bearing protector 14 is fitted onto the pump shaft 7. The second bearing protector 14 is located on the side of the front bearing 8 away from the rear bearing 9 and on the outside of the bearing housing 1. After the pump shaft 7 enters the bearing housing 1, the second bearing protector 14 is fitted onto the pump shaft 7 and then fixed to the side wall of the bearing housing 1. After the front bearing 8 is installed on the pump shaft 7, the pump shaft 7 is assembled into the bearing housing 1, and then the bearing end cover 2 is fitted onto the pump shaft 7. Subsequently, the second bearing protector 14 is fitted onto the pump shaft 7 and fixed to the bearing end cover 2. The operation is simple and convenient.

[0027] Reference Figure 3 and Figure 5 Because the air pressure of the lubricating oil mist increases after it mixes with compressed air, the lubricating oil mist is prone to leak from the gap between the oil reservoir and the bearing end cover 2. Therefore, in this embodiment, the bearing end cover 2 is provided with an oil mist stop groove on the side facing the bearing housing 1. The oil mist stop groove is opened along the axis of the pump shaft 7 and is annular. A sealing ring 15 is provided on the bearing end cover 2 through the oil mist stop groove.

[0028] Reference Figure 2 In this embodiment, an oil mist generator is also included. The oil mist generator is installed on the oil storage tank. The first oil mist lubrication pipeline 10 and the second oil mist lubrication pipeline 11 are respectively connected to the oil mist generator. The oil mist generator mixes and atomizes compressed air and lubricating oil, and then injects it into the front bearing 8 and the rear bearing 9 through the first oil mist lubrication pipeline 10 and the second oil mist lubrication pipeline 11. Then, it enters the bearing housing 1, and the cooled liquid lubricating oil is transported to the oil storage tank through the lubricating oil mist return pipeline 12. After the lubricating oil in the oil storage tank is atomized by the oil mist generator, the compressed air is mixed with the atomized lubricating oil mist, and then injected into the front bearing 8 and the rear bearing 9 through the first oil mist lubrication pipeline 10 and the second oil mist lubrication pipeline 11 to lubricate and cool the front bearing 8 and the rear bearing 9.

[0029] Reference Figure 3 Because the lubricating oil mist pressure is high on the front side of the front bearing 8 and the rear bearing 9, and the rollers inside the front bearing 8 and the rear bearing 9 significantly obstruct the lubricating oil mist, it is difficult for the lubricating oil mist to pass smoothly through the front bearing 8 and the rear bearing 9. Therefore, in this embodiment, a suction member 16 is provided inside the bearing housing 1. The suction member 16 is used to generate suction on the rear side of the front bearing 8 and the rear bearing 9 to push the lubricating oil mist on the front side of the front bearing 8 and the rear bearing 9 through the front bearing 8 and the rear bearing 9 for lubrication and cooling. When the lubricating oil mist enters the front side of the front bearing 8 and the rear bearing 9, it is acted upon by the suction member 16 on the rear side of the front bearing 8 and the rear bearing 9, causing the air pressure on the rear side of the front bearing 8 and the rear bearing 9 to drop, thereby guiding the flow direction of the lubricating oil mist and facilitating the lubricating oil mist to pass through the front bearing 8 and the rear bearing 9 to cool and lubricate the rollers and the cage.

[0030] Reference Figure 3 In this embodiment, the suction member 16 includes two miniature fan blades 161 disposed on the pump shaft 7 and respectively close to the rear side of the front bearing 8 and the rear bearing 9. When the pump shaft 7 rotates at high speed, the pump shaft 7 drives the miniature fan blades 161 to rotate at high speed. The rotation of the miniature fan blades 161 causes the air pressure on the rear side of the front bearing 8 and the rear bearing 9 to drop, thereby guiding the flow direction of the lubricating oil mist.

[0031] Reference Figure 3 In this embodiment, the suction member 16 includes a cooling plate 162 disposed in the bearing housing 1. After the lubricating oil mist passing through the front bearing 8 and the rear bearing 9 is cooled and liquefied by the cooling plate 162, the air pressure in the bearing housing 1 decreases, pushing the lubricating oil mist through the front bearing 8 and the rear bearing 9. The lubricating oil mist passing through the front bearing 8 and the rear bearing 9 adheres to the cooling plate 162, causing the atomized lubricating oil mist to cool rapidly and liquefy into a liquid state, thereby reducing the air pressure in the oil reservoir and facilitating the passage of the lubricating oil mist on the front side of the front bearing 8 and the rear bearing 9.

[0032] The implementation principle of the oil mist lubrication system for a horizontal rotary jet pump in this application embodiment is as follows: When the rotary jet pump is in use, the lubricating oil in the oil reservoir is atomized into a lubricating oil mist. This mist is then introduced into the bearing housing 1 through the first oil mist lubrication line 10 and the second oil mist lubrication line 11. The first oil mist lubrication line 10 directs the lubricating oil mist to the front of the front bearing 8, passes through the interior of the front bearing 8, and then exits from the rear of the front bearing 8 into the bearing housing 1. The second oil mist lubrication line 11 directs the lubricating oil mist to the front of the rear bearing 9, passes through the interior of the rear bearing 9, and then exits into the bearing housing 1. During this process, the bearings are lubricated by oil mist through a special flow channel design. Combined with a bearing protector, this not only ensures good lubrication but also reduces the risk of lubricating oil leakage. Furthermore, the atomization of the lubricating oil increases the contact area between the lubricating oil and the front and rear bearings 8 and 9, thereby improving the lubrication effect and efficiency of the front and rear bearings 8 and 9.

[0033] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An oil mist lubrication system for a horizontal rotary jet pump, characterized in that: The device includes a bearing housing (1), a bearing end cover (2), an impeller (3), a cover (4), and a flow guiding assembly (5). The bearing end cover (2) is fixedly installed at the end of the bearing housing (1). The cover (4) covers the end of the bearing end cover (2) and forms an impeller cavity (6) inside the bearing end cover (2). The impeller (3) is installed inside the impeller cavity (6). The flow guiding assembly (5) is used to transport the medium. It also includes a pump shaft (7), which is rotatably mounted inside the bearing housing (1) and passes through the bearing end cover (2) to enter the impeller cavity (6), and the impeller (3) is mounted on the pump shaft (7); It also includes a front bearing (8) and a rear bearing (9), both of which are embedded in the bearing housing (1). The pump shaft (7) is rotatably mounted in the bearing housing (1) via the front bearing (8) and the rear bearing (9). It also includes a first oil mist lubrication line (10), a second oil mist lubrication line (11), and a lubricating oil mist return line (12); The first oil mist lubrication line (10) is used to cool the front bearing (8). The first oil mist lubrication line (10) enters the bearing housing (1) from the outside of the front bearing (8), through the front bearing (8), and then from the rear of the front bearing (8). The second oil mist lubrication line (11) is used to cool the rear bearing (9). The second oil mist lubrication line (11) enters the rear bearing (9) from the side of the rear bearing (9) near the bearing end cover (2) and enters the bearing housing (1). The lubricating oil mist return pipeline (12) is connected to the bottom of the bearing housing (1) and transports the cooled lubricating oil mist back to the oil storage tank.

2. The oil mist lubrication system for a horizontal rotary jet pump according to claim 1, characterized in that: The first oil mist lubrication pipeline (10) includes a first pipeline (101) connected to the oil reservoir and a first oil inlet channel (102) opened in the bearing housing (1). The first oil inlet channel (102) is L-shaped. The vertical pipeline of the first oil inlet channel (102) is connected to the first pipeline (101). The oil outlet end of the horizontal pipeline of the first oil inlet channel (102) faces the outside of the front bearing (8).

3. The oil mist lubrication system for a horizontal rotary jet pump according to claim 1, characterized in that: The second oil mist lubrication pipeline (11) includes a second pipeline (111) connected to the oil reservoir and a second oil inlet channel. The second oil inlet channel includes a first channel (112), a second channel (113), a third channel (114), and a fourth channel (115). The first channel (112) and the second channel (113) are opened on the inner wall of the bearing housing (1). The first channel (112) is opened vertically, and the second channel (113) is opened horizontally. The first channel (112) and the second channel (113) are connected. The third channel (114) extends from the end of the bearing housing (1) towards... A third channel (114) is formed by opening in the direction of the forward bearing (8) and closing the side of the third channel (114) by the bearing end cover (2). The third channel (114) is vertically arranged and also includes a sealing member. The sealing member is sleeved on the pump shaft (7) and seals the gap between the bearing end cover (2) and the pump shaft (7). The fourth channel (115) is formed by the gap between the rear bearing (9) and the sealing member. After passing through the first channel (112), the second channel (113), the third channel (114) and the fourth channel (115), the oil mist passes through the rear bearing (9) and returns to the bearing housing (1).

4. The oil mist lubrication system for a horizontal rotary jet pump according to claim 3, characterized in that: The sealing component includes a first bearing protector (13), which is sleeved on the pump shaft (7). After being sleeved on the pump shaft (7), the first bearing protector (13) is fixed on the bearing end cover (2). The first bearing protector (13) is located on the side of the rear bearing (9) close to the bearing end cover (2), and a gap is left between the rear bearing (9) and the first bearing protector (13) to form a fourth channel (115). The first bearing protector (13) is first assembled on the bearing end cover (2), and then the bearing end cover (2) is assembled on the bearing housing (1). Then the pump shaft (7) with the rear bearing (9) is assembled into the bearing housing (1) and the pump shaft (7) is assembled into the first bearing protector (13).

5. The oil mist lubrication system for a horizontal rotary jet pump according to claim 4, characterized in that: The pump shaft (7) is fitted with a second bearing protector (14). The second bearing protector (14) is located on the side of the front bearing (8) away from the rear bearing (9) and on the outside of the bearing housing (1). After the pump shaft (7) enters the bearing housing (1), the second bearing protector (14) is fitted onto the pump shaft (7) and then fixed to the side wall of the bearing housing (1).

6. The oil mist lubrication system for a horizontal rotary jet pump according to claim 3, characterized in that: The bearing end cover (2) has an oil mist stop groove on the side facing the bearing housing (1). The oil mist stop groove is opened along the axis of the pump shaft (7) and is annular. A sealing ring (15) is provided on the bearing end cover (2) through the oil mist stop groove.

7. The oil mist lubrication system for a horizontal rotary jet pump according to claim 1, characterized in that: It also includes an oil mist generator, which is installed on the oil storage tank. The first oil mist lubrication pipeline (10) and the second oil mist lubrication pipeline (11) are respectively connected to the oil mist generator. The oil mist generator mixes and atomizes compressed air and lubricating oil, and then injects it into the front bearing (8) and the rear bearing (9) through the first oil mist lubrication pipeline (10) and the second oil mist lubrication pipeline (11), and then enters the bearing housing (1). The cooled liquid lubricating oil is then transported to the oil storage tank through the lubricating oil mist return pipeline (12).

8. The oil mist lubrication system for a horizontal rotary jet pump according to claim 1, characterized in that: The bearing housing (1) is provided with a suction member (16), which is used to generate suction on the rear side of the front bearing (8) and the rear bearing (9) to push the lubricating oil mist on the front side of the front bearing (8) and the rear bearing (9) through the front bearing (8) and the rear bearing (9) to lubricate and cool the front bearing (8) and the rear bearing (9).

9. The oil mist lubrication system for a horizontal rotary jet pump according to claim 8, characterized in that: The suction component (16) includes two miniature fan blades (161) disposed on the pump shaft (7) and located near the rear side of the front bearing (8) and the rear bearing (9), respectively.

10. The oil mist lubrication system for a horizontal rotary jet pump according to claim 8, characterized in that: The suction device (16) includes a cooling plate (162) disposed in the bearing housing (1). After the lubricating oil mist passing through the front bearing (8) and the rear bearing (9) is cooled and liquefied by the cooling plate (162), the air pressure in the bearing housing (1) drops and pushes the lubricating oil mist through the front bearing (8) and the rear bearing (9).

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