A planetary multistage booster gear pump

Abstract

This utility model provides a planetary multistage booster gear pump, belonging to the field of pump technology. The planetary multistage booster gear pump provided by this utility model includes a pump body, a drive gear assembly, and a planetary gear assembly. The pump body is provided with an inlet and an outlet. The drive gear assembly includes a drive gear and a drive gear shaft. The planetary gear assembly includes multiple sets of planetary gears and planetary gear shafts, with the planetary gears distributed circumferentially around the drive gear and meshing with it. A first anti-backflow column is provided at one end of the partition plate between the inlet and outlet. The first anti-backflow column has a small clearance fit with the drive gear. During the rotation of the drive gear, at least one tooth faces the sidewall of the first anti-backflow column, forming a channel suitable for liquid flow between the planetary gears and the inner cavity sidewall of the pump body. In this planetary multistage booster gear pump, during operation, the liquid flows within the channel, and the first anti-backflow column prevents liquid from flowing from the outlet to the inlet, thus preventing liquid backflow.

Description

Technical Field

[0001] This utility model belongs to the field of delivery pump technology, specifically relating to a planetary multi-stage booster gear pump. Background Technology

[0002] A gear pump is a device that converts mechanical energy into hydraulic energy. It can provide hydraulic systems with liquids of a certain pressure and flow rate. Gear pumps are simple in structure, easy to manufacture, reliable in operation, and have low sensitivity to oil contamination. They are widely used for liquid transportation and pressurization and are an important component of hydraulic systems.

[0003] Gear pumps utilize the change and movement of the working volume formed between the pump cylinder and meshing gears to transport or pressurize liquids. When the gears rotate, the volume of the space on the disengaged side increases, creating a vacuum that draws in the liquid. Conversely, the volume of the space on the meshing side decreases, expelling the liquid. The inlet and outlet of a gear pump are separated by the meshing line of the two gears, and the pressure at the pump outlet depends on the resistance at the outlet. However, ordinary gear pumps suffer from high impact noise and large flow pulsation, which limits their application, especially in high-precision hydraulic transmission systems where they are rarely used as power components.

[0004] Planetary gear pumps use a planetary gear distribution method, eliminating the need for offset of the power input (or output) shaft, ensuring radial hydraulic pressure balance, resulting in uniform combined flow, low flow pulsation, and low noise. This reduces wear on bearings and gears, extending bearing life.

[0005] However, during the operation of a planetary gear pump, the high-pressure medium at the discharge port may flow back into the inlet, affecting the delivery of the liquid. Utility Model Content

[0006] The purpose of this invention is to provide a planetary multi-stage booster gear pump, which aims to solve the problem of high-pressure medium flowing back into the inlet of the pump during operation.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a planetary multi-stage booster gear pump is provided, comprising: a pump body, with an inlet and an outlet spaced apart on the side wall, the inlet and the outlet respectively communicating with the inner cavity of the pump body, and a first sealing element and a second sealing element respectively provided at both ends of the pump body; A drive wheel assembly includes a drive gear and a drive wheel shaft. The drive wheel shaft passes through the drive gear and limits the drive gear to the centerline of the inner cavity of the pump body. Both ends of the drive wheel shaft are respectively disposed on the end faces of the pump body via drive wheel sliding bearings. The planetary gear assembly includes multiple sets of planetary gears and planetary gear shafts arranged in a one-to-one correspondence. The planetary gear shafts pass through the planetary gears and limit the planetary gears in the inner cavity of the pump body. The multiple sets of planetary gears are distributed around the drive gear and mesh with the drive gear. The two ends of the planetary gear shafts are respectively set on the end faces of the pump body through planetary gear sliding bearings. The inlet and outlet are isolated by a partition plate, which is disposed between the two sets of planetary gears. A first anti-backflow column is provided at the end of the partition plate near the drive gear. The first anti-backflow column and the drive gear are in a small clearance fit. During the rotation of the drive gear, at least one tooth faces the side wall of the first anti-backflow column. A channel suitable for liquid flow is formed between the planetary gears and the inner cavity side wall of the pump body.

[0008] In one possible implementation, the inner cavity is provided with multiple sets of second anti-backflow columns. The second anti-backflow columns are located beside the drive gear and between the two sets of planetary gears. The second anti-backflow columns and the drive gears are in a small clearance fit. During the rotation of the drive gears, at least one tooth faces the sidewall of the second anti-backflow column. The sidewall of the second anti-backflow column forms a channel suitable for liquid flow between the planetary gears and the inner cavity sidewall of the pump body.

[0009] In one possible implementation, a first positioning surface is provided on the side wall of the drive wheel sliding bearing, and a second positioning surface is provided on the side wall of the planetary gear sliding bearing, wherein the first positioning surface and the second positioning surface are fitted together.

[0010] In one possible implementation, a first unloading groove is provided on the circumferential sidewall of the drive gear sliding bearing, and the first unloading groove is located close to the drive gear; a second unloading groove is provided on the circumferential sidewall of the planetary gear sliding bearing, and the second unloading groove is located close to the planetary gear.

[0011] In one possible implementation, the first unloading groove is disposed at the junction of the driving wheel sliding bearing and the planetary gear sliding bearing; the second unloading groove is disposed at the junction of the driving wheel sliding bearing and the planetary gear sliding bearing.

[0012] In one possible implementation, the first unloading groove is connected to the second unloading groove next to it.

[0013] In one possible implementation, the first seal includes: A front cover is provided at the first end of the pump body, and the center of the front cover is provided with a central hole suitable for the drive wheel shaft to pass through. A mechanical seal, fitted onto the drive shaft and passing through the central hole; and A sealing gland is fitted onto the drive wheel shaft and covers the outside of the mechanical seal, the sealing gland limiting the mechanical seal on the front cover.

[0014] In one possible implementation, the first seal further includes a first gasket disposed between the front cover and the pump body, the first gasket having a first oil return groove.

[0015] In one possible implementation, the second seal includes a rear cover disposed at the second end of the pump body.

[0016] In one possible implementation, the second seal further includes a second gasket disposed between the rear cover and the pump body, the second gasket having a second oil return groove.

[0017] The beneficial effects of the planetary multi-stage booster gear pump provided by this utility model are as follows: Compared with the prior art, the pump body has an inlet and an outlet on its side wall. The inlet is suitable for the liquid to be discharged into the pump body and enter the inner cavity of the pump body. The outlet is suitable for the liquid to be discharged from the pump body. The pump body has a first seal and a second seal at both ends. The first seal and the second seal are used to seal the two ends of the pump body to prevent liquid leakage during the use of the device. The drive wheel assembly includes a drive gear and a drive wheel shaft. The drive gear is located inside the pump body, and the drive wheel shaft passes through the drive gear and the pump body. A drive wheel sliding bearing is provided on the end face of the pump body. The two ends of the drive wheel shaft are respectively inserted into two sets of drive wheel sliding bearings. The drive wheel sliding bearings help the drive wheel shaft to rotate, reduce the resistance to the rotation of the drive wheel shaft, drive the drive wheel shaft to rotate, and drive the drive gear to rotate. The drive shaft is set along the centerline of the pump body to improve the uniformity of force on the drive gear and drive shaft, and avoid damage to the device due to uneven force. The planetary gear assembly includes multiple sets of planetary gears and planetary gear shafts. The planetary gears and planetary gear shafts are arranged in a one-to-one correspondence. The planetary gear shafts pass through the planetary gears and the pump body. Planetary gear sliding bearings are provided on the end face of the pump body. The two ends of the planetary gear shafts are respectively inserted into two corresponding sets of planetary gear sliding bearings. The planetary gear sliding bearings help the planetary gear shafts rotate and reduce the resistance to the rotation of the planetary gear shafts. A partition plate is installed between the inlet and the outlet to isolate the inlet and the outlet. One end of the partition plate is located in the pump body cavity, between the two sets of planetary gears, facing the drive gear. The other end of the partition plate extends to the outer wall of the pump body. A channel is formed between the outer wall of the planetary gear and the side wall of the pump body cavity, and the channel is suitable for the flow of liquid; A first anti-backflow column is provided at one end of the partition plate near the drive gear. The first anti-backflow column is located on the side of the drive gear. The side wall of the first anti-backflow column facing the drive gear is in close clearance fit with the drive gear. During the rotation of the drive gear, at least one tooth of the drive gear is in the area of ​​the side wall of the first anti-backflow column facing the drive gear. When the device is in operation, the liquid enters the inner cavity of the pump body through the inlet, driving the drive wheel shaft to rotate. The drive wheel shaft drives the drive gear to rotate, and the drive gear drives the planetary gear to rotate. As the planetary gear rotates, the teeth of the planetary gear drive the liquid in the inner cavity of the pump body to flow, realizing the transportation and pressurization of the liquid in the inner cavity of the pump body, and delivering the liquid to the outlet to be discharged from the pump body. During the rotation of the drive gear, it can always be ensured that there are teeth of the drive gear in front of the side wall of the first anti-backflow column facing the drive gear. The first anti-backflow column isolates the liquid on both sides of it, that is, it prevents the liquid near the drain port area from flowing into the inlet area, and prevents the liquid from flowing back at the drain port, which facilitates the delivery and pressurization of the liquid. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A three-dimensional structural diagram of the planetary multi-stage booster gear pump provided in this embodiment of the utility model. Figure 1 ; Figure 2 A three-dimensional structural diagram of the planetary multi-stage booster gear pump provided in this embodiment of the utility model. Figure 2 ; Figure 3 A vertical cross-sectional view of the planetary multi-stage booster gear pump provided in this embodiment of the utility model; Figure 4 A cross-sectional view of the planetary multi-stage booster gear pump provided in an embodiment of this utility model; Figure 5 This is a three-dimensional structural diagram of the front cover used in an embodiment of the present utility model; Figure 6 This is a three-dimensional structural diagram of the mechanical seal used in the embodiments of this utility model; Figure 7 This is a three-dimensional structural diagram of the first gasket used in an embodiment of the present utility model; Figure 8 This is a three-dimensional structural diagram of the first end of the pump body used in an embodiment of the present utility model; Figure 9 A three-dimensional structural diagram of the driving gear used in this embodiment of the utility model. Figure 1 ; Figure 10 A three-dimensional structural diagram of the driving gear used in this embodiment of the utility model. Figure 2 ; Figure 11 This is a three-dimensional structural diagram of the second gasket used in an embodiment of the present utility model; Figure 12 This is a three-dimensional structural diagram of the second end of the pump body used in an embodiment of the present utility model; Figure 13 This is a three-dimensional structural diagram of the planetary gear used in the embodiment of this utility model.

[0020] In the diagram: 1. Pump body; 2. Inlet; 3. Outlet; 4. Inner cavity; 5. Drive gear; 6. Drive shaft; 7. Drive sliding bearing; 8. Drive bearing sleeve; 9. Drive composite sleeve; 10. Planetary gear; 11. Planetary gear shaft; 12. Planetary sliding bearing; 13. Planetary bearing sleeve; 14. Planetary composite sleeve; 15. Spacer; 16. First anti-backflow column; 17. Second anti-backflow column; 18. Channel; 19. First planetary gear; 20. Second row 21. Third planetary gear; 22. First positioning surface; 23. Second positioning surface; 24. First unloading groove; 25. Second unloading groove; 26. Front cover; 27. Mechanical seal; 28. Sealing gland; 29. ​​Limiting cylinder; 30. First gasket; 31. First oil return groove; 32. First branch groove; 33. First injection groove; 34. Rear cover; 35. Second gasket; 36. Second oil return groove; 37. Second branch groove; 38. Second injection groove; 39. Locking bolt. Detailed Implementation

[0021] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0022] Please refer to Figures 1 to 13This invention provides a specific embodiment of a planetary multi-stage booster gear pump, comprising a pump body 1, a drive gear assembly, and a planetary gear assembly. The pump body 1 has an inlet 2 and an outlet 3 spaced apart on its side wall, which are respectively connected to the inner cavity 4 of the pump body 1. A first seal and a second seal are respectively provided at both ends of the pump body 1. The drive gear assembly includes a drive gear 5 and a drive gear shaft 6. The drive gear shaft 6 passes through the drive gear 5, limiting the drive gear 5 to the centerline of the inner cavity 4 of the pump body 1. Both ends of the drive gear shaft 6 are respectively mounted on the end faces of the pump body 1 via drive gear sliding bearings 7. The planetary gear assembly includes multiple sets of planetary gears 10 and planetary gear shafts 11 arranged in a one-to-one correspondence. The axle 11 passes through the planetary gear 10, limiting the planetary gear 10 within the inner cavity 4 of the pump body 1. Multiple sets of planetary gears 10 are distributed around the drive gear 5 and mesh with it. The two ends of the planetary gear axle 11 are respectively mounted on the end faces of the pump body 1 via planetary gear sliding bearings 12. The inlet 2 and outlet 3 are separated by a partition plate 15, which is positioned between the two sets of planetary gears 10. A first anti-backflow column 16 is provided at the end of the partition plate 15 closest to the drive gear 5. The first anti-backflow column 16 is fitted with the drive gear 5 with a small clearance. During the rotation of the drive gear 5, at least one tooth faces the side wall of the first anti-backflow column 16. A channel 18 suitable for liquid flow is formed between the planetary gear 10 and the side wall of the inner cavity 4 of the pump body 1.

[0023] The planetary gear 10 can be configured in multiple sets depending on the actual situation. For ease of description, we will take a configuration with three sets of planetary gear 10 as an example.

[0024] For details, please refer to Figures 1 to 13 The pump body 1 is cylindrical, and an inlet 2 and an outlet 3 are provided on the circumferential side wall of the pump body 1. An inner cavity 4 is provided inside the pump body 1. Both the inlet 2 and the outlet 3 are connected to the inner cavity 4 of the pump body 1. The liquid is transported and pressurized in the inner cavity 4. The inlet 2 is suitable for the liquid to be discharged into the pump body 1 and the liquid enters the inner cavity 4 of the pump body 1. The outlet 3 is suitable for the liquid to be discharged from the pump body 1.

[0025] Along the axial direction of the pump body 1, the pump body 1 has a first end and a second end. A first seal and a second seal are provided at both ends of the pump body 1. The first seal seals the first end of the pump body 1, and the second seal seals the second end of the pump body 1 to prevent liquid leakage during the use of the device.

[0026] The drive wheel assembly includes a drive gear 5 and a drive wheel shaft 6. The drive gear 5 is located inside the inner cavity 4 of the pump body 1. The drive wheel shaft 6 passes through the drive gear 5 and the pump body 1. Drive wheel sliding bearings 7 are provided on the first and second end faces of the pump body 1. The two ends of the drive wheel shaft 6 are respectively inserted into the two sets of drive wheel sliding bearings 7. The drive wheel shaft 6 and the pump body 1 are rotated through the drive wheel sliding bearings 7. The drive wheel sliding bearings 7 help the drive wheel shaft 6 to rotate, reduce the resistance to the rotation of the drive wheel shaft 6, drive the drive wheel shaft 6 to rotate, and drive the drive gear 5 to rotate.

[0027] The drive wheel sliding bearing 7 includes a drive wheel bearing sleeve 8 and a drive wheel composite sleeve 9. The drive wheel composite sleeve 9 is sleeved on the drive wheel shaft 6 and passes through the drive wheel bearing sleeve 8. The drive wheel bearing sleeve 8 is located on the end face of the pump body 1.

[0028] The drive shaft 6 is set along the centerline of the pump body 1 to improve the uniformity of force on the drive gear 5 and drive shaft 6, and to avoid damage to the device due to uneven force.

[0029] The first end of the drive wheel shaft 6 passes through the drive wheel sliding bearing 7 at the first end of the pump body 1, and the first end of the drive wheel shaft 6 passes through the pump body 1 and the first seal, so as to facilitate the rotation of the first end of the drive wheel shaft 6; the second end of the drive wheel shaft 6 passes through the drive wheel sliding bearing 7 at the second end of the pump body 1, and the second end of the drive wheel shaft 6 does not pass through the pump body 1.

[0030] The planetary gear assembly includes multiple sets of planetary gears 10 and planetary gear shafts 11. The planetary gears 10 and planetary gear shafts 11 are arranged in a one-to-one correspondence. When there are three sets of planetary gears 10, there are three sets of planetary gear shafts 11 respectively. The planetary gear shafts 11 pass through the planetary gears 10 and the pump body 1. Planetary gear sliding bearings 12 are provided on the first and second end faces of the pump body 1. The two ends of the planetary gear shaft 11 are respectively inserted into the corresponding two sets of planetary gear sliding bearings 12. The driving gear 5 meshes with the planetary gears 10. The driving gear 5 drives the planetary gears 10 to rotate, and the planetary gears 10 drive the planetary gear shafts 11 to rotate. The planetary gear sliding bearings 12 realize the rotational connection between the planetary gear shafts 11 and the pump body 1, which helps the planetary gear shafts 11 to rotate and reduces the resistance to the rotation of the planetary gear shafts 11.

[0031] The planetary gear sliding bearing 12 includes a planetary gear bearing sleeve 13 and a planetary gear composite sleeve 14. The planetary gear composite sleeve 14 is sleeved on the planetary gear shaft 11 and passes through the planetary gear bearing sleeve 13. The planetary gear bearing sleeve 13 is located on the end face of the pump body 1.

[0032] The planetary gear shaft 11 is arranged along the length of the pump body 1 and is parallel to the drive gear shaft 6. The first end of the planetary gear shaft 11 passes through the planetary gear sliding bearing 12 at the first end of the pump body 1, and the first end of the planetary gear shaft 11 does not pass through the pump body 1. The second end of the planetary gear shaft 11 passes through the planetary gear sliding bearing 12 at the second end of the pump body 1, and the second end of the planetary gear shaft 11 does not pass through the pump body 1.

[0033] A partition plate 15 is disposed between the inlet 2 and the outlet 3 to isolate the inlet 2 and the outlet 3. One end of the partition plate 15 is located in the inner cavity 4 of the pump body 1, between two sets of planetary gears 10, and is positioned towards the drive gear 5. The partition plate 15 is arranged radially along the drive gear 5 and perpendicular to the drive shaft 6. The other end of the partition plate 15 extends to the outer wall of the pump body 1.

[0034] A channel 18 is formed between the outer wall of the planetary gear 10 away from the driving gear 5 and the side wall of the inner cavity 4 of the pump body 1. The channel 18 is suitable for the flow of liquid. When the planetary gear 10 rotates, it drives the liquid to flow into the channel 18 for liquid transportation.

[0035] Multiple sets of planetary gears 10 are evenly distributed around the drive gear 5 to improve the stability of liquid transportation.

[0036] A first anti-backflow column 16 is provided at one end of the partition plate 15 near the drive gear 5. The first anti-backflow column 16 is located on the side of the drive gear 5. The side wall of the first anti-backflow column 16 facing the drive gear 5 is in a small clearance fit with the drive gear 5, that is, the free end of the tooth of the drive gear 5 is in a small clearance fit with the side wall of the first anti-backflow column 16.

[0037] During the rotation of the drive gear 5, at least one tooth of the drive gear 5 is located in the area of ​​the first anti-backflow column 16 facing the side wall of the drive gear 5. The length of the arc of the first anti-backflow column 16 facing the side wall of the drive gear 5 is greater than the length of the arc of the free ends of two adjacent teeth of the drive gear 5. During the operation of the device, the liquid will not flow through the gap between the first anti-backflow column 16 and the drive gear 5.

[0038] When the device is in operation, the liquid enters the inner cavity 4 of the pump body 1 through the inlet 2, driving the drive wheel shaft 6 to rotate. The drive wheel shaft 6 drives the drive gear 5 to rotate, and the drive gear 5 drives the planetary gear 10 to rotate. As the planetary gear 10 rotates, the teeth of the planetary gear 10 drive the liquid in the inner cavity 4 of the pump body 1 to flow, realizing the transportation and pressurization of the liquid in the inner cavity 4 of the pump body 1, and delivering the liquid to the outlet 3 to be discharged from the pump body 1.

[0039] During the rotation of the drive gear 5, it can always be ensured that the front of the first anti-backflow column 16 facing the side wall of the drive gear 5 has the teeth of the drive gear 5. The first anti-backflow column 16 isolates the liquid on both sides of it, that is, it prevents the liquid near the drain port 3 area from flowing into the inlet port 2 area, and prevents the liquid from flowing back at the drain port 3, which facilitates the delivery and pressurization of the liquid.

[0040] As a specific embodiment of the planetary multi-stage booster gear pump provided by this utility model, please refer to Figure 4 Multiple sets of second anti-backflow columns 17 are provided in the inner cavity 4. The second anti-backflow columns 17 are located on the side of the drive gear 5 and between the two sets of planetary gears 10. The second anti-backflow columns 17 and the drive gear 5 are in close clearance fit. During the rotation of the drive gear 5, at least one tooth faces the side wall of the second anti-backflow column 17. The side wall of the second anti-backflow column 17 and the planetary gears 10 and the side wall of the inner cavity 4 of the pump body 1 form a channel 18 suitable for liquid flow.

[0041] For details, please refer to Figure 4 The second anti-backflow column 17 is installed inside the inner cavity 4 of the pump body 1. The second anti-backflow column 17 has the same anti-backflow function as the first anti-backflow column 16. The second anti-backflow column 17 is installed between two adjacent sets of planetary gears 10. Taking the installation of three sets of planetary gears 10 as an example, the second anti-backflow column 17 is installed in two sets.

[0042] The three sets of planetary gears 10 are arranged in a counterclockwise direction, namely the first planetary gear 19, the second planetary gear 20 and the third planetary gear 21. The first anti-backflow column 16 is set between the first planetary gear 19 and the third planetary gear 21. A set of second anti-backflow columns 17 is set between the first planetary gear 19 and the second planetary gear 20. A set of second anti-backflow columns 17 is set between the second planetary gear 20 and the third planetary gear 21.

[0043] The second anti-backflow column 17 forms a channel 18 suitable for liquid flow between the three sets of sidewalls of the drive gear 5, the two adjacent sets of planetary gears 10, and the sidewall of the inner cavity 4 of the pump body 1 located between these two sets of planetary gears 10.

[0044] The second anti-backflow column 17 is disposed on the side of the drive gear 5. The side wall of the second anti-backflow column 17 facing the drive gear 5 is in a small clearance fit with the drive gear 5, that is, the free end of the tooth of the drive gear 5 is in a small clearance fit with the side wall of the second anti-backflow column 17.

[0045] During the rotation of the drive gear 5, at least one tooth of the drive gear 5 is located in the area of ​​the second anti-backflow column 17 facing the side wall of the drive gear 5. The length of the arc of the second anti-backflow column 17 facing the side wall of the drive gear 5 is greater than the length of the arc of the free ends of two adjacent teeth of the drive gear 5. During the operation of the device, the liquid will not flow through the gap between the second anti-backflow column 17 and the drive gear 5.

[0046] During the rotation of the drive gear 5, it can always be ensured that the front of the second anti-backflow column 17 facing the side wall of the drive gear 5 has the teeth of the drive gear 5. The second anti-backflow column 17 isolates the liquid on both sides of it, preventing the liquid from flowing back at both ends of the channel 18, which facilitates the delivery and pressurization of the liquid.

[0047] As a specific embodiment of the planetary multi-stage booster gear pump provided by this utility model, please refer to Figure 8 , Figure 9 , Figure 10 , Figure 12 as well as Figure 13 The side wall of the drive wheel sliding bearing 7 is provided with a first positioning surface 22, and the side wall of the planetary wheel sliding bearing 12 is provided with a second positioning surface 23. The first positioning surface 22 and the second positioning surface 23 are fitted together.

[0048] For details, please refer to Figure 8 , Figure 9 , Figure 10 , Figure 12 as well as Figure 13 The first positioning surface 22 on the side wall of the driving gear sliding bearing 7 is matched with the second positioning surface 23 on the side wall of the planetary gear sliding bearing 12. The first positioning surface 22 is located on the side wall of the driving gear sliding bearing 7 near the planetary gear sliding bearing 12, and the second positioning surface 23 is located on the side wall of the planetary gear sliding bearing 12 near the driving gear sliding bearing 7. There are multiple sets of the first positioning surface 22, and the number of the first positioning surfaces 22 is the same as the number of planetary gears 10. Taking the example of three sets of planetary gears 10, there are three sets of the first positioning surfaces 22.

[0049] As a specific embodiment of the planetary multi-stage booster gear pump provided by this utility model, please refer to Figure 9 , Figure 10 as well as Figure 13 The circumferential sidewall of the drive gear sliding bearing 7 is provided with a first unloading groove 24, which is located near the drive gear 5; the circumferential sidewall of the planetary gear sliding bearing 12 is provided with a second unloading groove 25, which is located near the planetary gear 10.

[0050] For details, please refer to Figure 9 , Figure 10 as well as Figure 13 The first unloading groove 24 is provided on the circumferential side wall of the drive gear sliding bearing 7. The drive gear sliding bearing 7 on both sides of the drive gear 5 is provided with the first unloading groove 24, and the first unloading groove 24 is provided at the end of the drive gear sliding bearing 7 near the drive gear 5. The second unloading groove 25 is provided on the circumferential side wall of the planetary gear sliding bearing 12. The planetary gear sliding bearing 12 on both sides of the planetary gear 10 is provided with the second unloading groove 25, and the second unloading groove 25 is provided at the end of the planetary gear sliding bearing 12 near the planetary gear 10. The first unloading groove 24 and the second unloading groove 25 can guide and unload the trapped oil after the drive gear 5 and the planetary gear 10 mesh.

[0051] As a specific embodiment of the planetary multi-stage booster gear pump provided by this utility model, please refer to Figure 9 , Figure 10 as well as Figure 13 The first unloading groove 24 is located at the junction of the driving wheel sliding bearing 7 and the planetary gear sliding bearing 12; the second unloading groove 25 is located at the junction of the driving wheel sliding bearing 7 and the planetary gear sliding bearing 12.

[0052] For details, please refer to Figure 9 , Figure 10 as well as Figure 13 The first unloading groove 24 is located at the edge of the first positioning surface 22 of the drive wheel sliding bearing 7, and the second unloading groove 25 is located at the edge of the second positioning surface 23 of the planetary gear sliding bearing 12. Along the length direction of the drive wheel shaft 6, a set of first unloading grooves 24 is provided on each side edge of the first positioning surface 22, and a set of second unloading grooves 25 is provided on each side edge of the second positioning surface 23.

[0053] Taking a planetary gear 10 with three sets as an example, the first unloading groove 24 is provided on both sides of the three sets of first positioning surfaces 22 of the driving wheel sliding bearing 7, the driving wheel sliding bearing 7 has six sets of first unloading grooves 24, the second unloading groove 25 is provided on both sides of the second positioning surface 23 of the planetary gear sliding bearing 12, and the planetary gear sliding bearing 12 has two sets of second unloading grooves 25.

[0054] The first unloading grooves 24 on the two sets of sliding bearings 7 of the driving gear 5 at both ends are set one-to-one; the second unloading grooves 25 on the two sets of sliding bearings 12 of the planetary gear 10 at both ends are set one-to-one.

[0055] As a specific embodiment of the planetary multi-stage booster gear pump provided by this utility model, please refer to Figure 9 , Figure 10 as well as Figure 13 The first unloading groove 24 is connected to the second unloading groove 25 on its side.

[0056] For details, please refer to Figure 9 , Figure 10 as well as Figure 13 The opening of the first unloading groove 24 is positioned opposite to the opening of the second unloading groove 25 on its side, and the shape of the first unloading groove 24 is the same as the shape of the second unloading groove 25.

[0057] The side wall of the first unloading groove 24 near the second unloading groove 25 is arc-shaped, and the side wall of the second unloading groove 25 near the first unloading groove 24 is arc-shaped, which facilitates the guidance and unloading of trapped oil.

[0058] As a specific embodiment of the planetary multi-stage booster gear pump provided by this utility model, please refer to Figure 1 , Figures 5 to 8 The first sealing element includes a front cover 26, a mechanical seal 27, and a sealing gland 28. The front cover 26 is located at the first end of the pump body 1, and a central hole suitable for the drive wheel shaft 6 to pass through is provided in the center of the front cover 26. The mechanical seal 27 is sleeved on the drive wheel shaft 6 and passes through the central hole. The sealing gland 28 is sleeved on the drive wheel shaft 6 and covers the outside of the mechanical seal 27. The sealing gland 28 limits the mechanical seal 27 on the front cover 26.

[0059] For details, please refer to Figure 1 , Figures 5 to 8 The first sealing element is used to seal the first end of the pump body 1. The first sealing element includes a front cover 26, a mechanical seal 27, and a sealing gland 28. The front cover 26 covers the first end face of the pump body 1 and is fixed to the first end face of the pump body 1 by locking bolts 39. A limiting cylinder 29 is provided at the center of the side of the front cover 26 away from the pump body 1. A central hole is provided at the center of the front cover 26, and the central hole penetrates the front cover 26 and the limiting cylinder 29.

[0060] The drive shaft 6 passes through the mechanical seal 27, which is installed inside the central hole. The sealing cover 28 is placed on the end face of the limiting cylinder 29 away from the pump body 1. The sealing cover 28 is fixed to the end face of the limiting cylinder 29 by locking bolts 39, which limits the mechanical seal 27 inside the central hole. The drive shaft 6 passes through the sealing cover 28, which facilitates the rotation of the drive shaft 6. The front cover 26, the mechanical seal 27, and the sealing cover 28 seal the pump body 1 to prevent the liquid inside the pump body 1 from flowing out along the drive shaft 6.

[0061] As a specific embodiment of the planetary multi-stage booster gear pump provided by this utility model, please refer to Figure 1 , Figure 3 , Figures 5 to 8 The first sealing element also includes a first gasket 30 disposed between the front cover 26 and the pump body 1, and a first oil return groove 31 is provided on the first gasket 30.

[0062] For details, please refer to Figure 1 , Figure 3 , Figures 5 to 8 The first gasket 30 is disposed between the front cover 26 and the pump body 1. The first gasket 30 covers the end face of the first end of the pump body 1. The first oil return groove 31 is disposed on the first gasket 30, which can provide a good lubrication circuit for the drive wheel sliding bearing 7 and the planetary wheel sliding bearing 12.

[0063] As an optional implementation, the first gasket 30 is provided with a relief hole at its center, which is suitable for the drive gear shaft 6 to pass through. The first oil return groove 31 is provided in the circumference of the relief hole. The first oil return groove 31 includes a plurality of first branch grooves 32. The first branch grooves 32 are distributed radially along the drive gear 5. The first branch grooves 32 extend from the side wall of the relief hole to the location of the planet gear shaft 11, which facilitates the lubrication of the drive gear sliding bearing 7 and the planet gear sliding bearing 12. Taking the configuration of three sets of planet gears 10 as an example, the first branch grooves 32 are provided in three sets.

[0064] One of the first branch grooves 32 has a first injection groove 33 on its side wall. One end of the first injection groove 33 is connected to the first branch groove 32, and the other end extends to the outside of the drive wheel sliding bearing 7 and the planetary wheel sliding bearing 12, so as to facilitate the injection of lubricant.

[0065] As a specific embodiment of the planetary multi-stage booster gear pump provided by this utility model, please refer to Figure 2 , Figure 3 , Figure 11 as well as Figure 12 The second seal includes a rear cover 34, which is disposed at the second end of the pump body 1.

[0066] For details, please refer to Figure 2 , Figure 3 , Figure 11 as well as Figure 12 The second seal is used to seal the second end of the pump body 1. The second seal includes a rear cover 34. The rear cover 34 covers the second end face of the pump body 1 and is fixed to the second end face of the pump body 1 by locking bolts 39.

[0067] As a specific embodiment of the planetary multi-stage booster gear pump provided by this utility model, please refer to Figure 2 , Figure 3 , Figure 11 as well as Figure 12 The second seal also includes a second gasket 35 disposed between the rear cover 34 and the pump body 1, and a second oil return groove 36 is provided on the second gasket 35.

[0068] For details, please refer to Figure 2 , Figure 3 , Figure 11 as well as Figure 12 The second gasket 35 is disposed between the rear cover 34 and the pump body 1. The second gasket 35 covers the end face of the second end of the pump body 1. The second oil return groove 36 is disposed on the second gasket 35, which can provide a good lubrication circuit for the drive wheel sliding bearing 7 and the planetary wheel sliding bearing 12.

[0069] As an optional implementation, the second oil return groove 36 includes a plurality of second branch grooves 37. The second branch grooves 37 are distributed radially along the drive gear 5. The first ends of the plurality of second branch grooves 37 converge at the center of the second gasket 35, and the other ends of the second branch grooves 37 extend to the location of the planetary gear shaft 11, so as to facilitate lubrication of the drive gear sliding bearing 7 and the planetary gear sliding bearing 12. Taking the example of three sets of planetary gears 10, three sets of second branch grooves 37 are provided.

[0070] One of the second branch grooves 37 has a second injection groove 38 on its side wall. One end of the second injection groove 38 is connected to the second branch groove 37, and the other end extends to the outside of the drive wheel sliding bearing 7 and the planetary wheel sliding bearing 12, so as to facilitate the injection of lubricant.

[0071] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A planetary multi-stage booster gear pump, characterized in that, include: The pump body has an inlet and an outlet spaced apart on its side wall. The inlet and outlet are respectively connected to the inner cavity of the pump body. A first seal and a second seal are respectively provided at both ends of the pump body. The drive wheel assembly includes a drive gear and a drive wheel shaft. The drive wheel shaft passes through the drive gear and limits the drive gear to the centerline of the inner cavity of the pump body. The two ends of the drive wheel shaft are respectively disposed on the two end faces of the pump body through drive wheel sliding bearings. as well as The planetary gear assembly includes multiple sets of planetary gears and planetary gear shafts arranged in a one-to-one correspondence. The planetary gear shafts pass through the planetary gears and limit the planetary gears in the inner cavity of the pump body. The multiple sets of planetary gears are distributed around the drive gear and mesh with the drive gear. The two ends of the planetary gear shafts are respectively set on the end faces of the pump body through planetary gear sliding bearings. The inlet and outlet are isolated by a partition plate, which is disposed between the two sets of planetary gears. A first anti-backflow column is provided at the end of the partition plate near the drive gear. The first anti-backflow column and the drive gear are in a small clearance fit. During the rotation of the drive gear, at least one tooth faces the side wall of the first anti-backflow column. A channel suitable for liquid flow is formed between the planetary gears and the inner cavity side wall of the pump body.

2. The planetary multi-stage booster gear pump as described in claim 1, characterized in that, Multiple sets of second anti-backflow columns are provided inside the inner cavity. The second anti-backflow columns are located beside the drive gear and between the two sets of planetary gears. The second anti-backflow columns and the drive gear are in a small clearance fit. During the rotation of the drive gear, at least one tooth faces the side wall of the second anti-backflow column. The side wall of the second anti-backflow column forms a channel suitable for liquid flow between the planetary gear and the inner cavity side wall of the pump body.

3. A planetary multi-stage booster gear pump as described in claim 1, characterized in that, The side wall of the drive wheel sliding bearing is provided with a first positioning surface, and the side wall of the planetary gear sliding bearing is provided with a second positioning surface, with the first positioning surface and the second positioning surface being fitted together.

4. A planetary multi-stage booster gear pump as described in claim 1, characterized in that, The circumferential sidewall of the drive gear sliding bearing is provided with a first unloading groove, which is located close to the drive gear; the circumferential sidewall of the planetary gear sliding bearing is provided with a second unloading groove, which is located close to the planetary gear.

5. A planetary multi-stage booster gear pump as described in claim 4, characterized in that, The first unloading groove is located at the junction of the driving wheel sliding bearing and the planetary gear sliding bearing; the second unloading groove is located at the junction of the driving wheel sliding bearing and the planetary gear sliding bearing.

6. A planetary multi-stage booster gear pump as described in claim 5, characterized in that, The first unloading groove is connected to the second unloading groove next to it.

7. A planetary multi-stage booster gear pump as described in claim 1, characterized in that, The first seal includes: A front cover is provided at the first end of the pump body, and the center of the front cover is provided with a central hole suitable for the drive wheel shaft to pass through. A mechanical seal, fitted onto the drive shaft and passing through the central hole; and A sealing gland is fitted onto the drive wheel shaft and covers the outside of the mechanical seal, the sealing gland limiting the mechanical seal on the front cover.

8. A planetary multi-stage booster gear pump as described in claim 7, characterized in that, The first seal also includes a first gasket disposed between the front cover and the pump body, and the first gasket is provided with a first oil return groove.

9. A planetary multi-stage booster gear pump as described in claim 1, characterized in that, The second seal includes a rear cover disposed at the second end of the pump body.

10. A planetary multi-stage booster gear pump as described in claim 9, characterized in that, The second seal also includes a second gasket disposed between the rear cover and the pump body, the second gasket having a second oil return groove.

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