A water pump with an oil chamber built-in impeller

Abstract

The utility model provides a kind of water pump of oil room built-in impeller, including the cylinder body with oil room inside, motor shaft through cylinder body, upper rubber pad cylinder body includes cylinder base, cylinder cover, upper rubber pad oil room is provided with mechanical seal, mechanical seal includes the lower static ring, lower dynamic ring, elastic element, upper dynamic ring, upper static ring sequentially arranged from bottom to top, the upper surface of upper rubber pad cylinder base is equipped with lower groove, the lower surface of upper rubber pad cylinder cover is equipped with upper groove, lower dynamic ring is equipped with a plurality of lower oil hole, upper dynamic ring is equipped with a plurality of upper oil hole, upper rubber pad oil room is provided with the impeller of being sleeved on motor shaft, upper rubber pad oil room is provided with pressurizing cover, a plurality of oil holes are equipped on the outside wall of pressurizing cover.The water pump of this oil room built-in impeller can make mechanical oil form rapid flow circulation, accelerate the heat generated by lower friction pair, in low oil level, also can continuously pressurize mechanical oil, so that mechanical oil is sprayed to upper static ring to lubricate and cool upper friction pair.

Description

Technical Field

[0001] This utility model relates to the technical field of water pumps, and in particular to a water pump with an internal impeller in the oil chamber. Background Technology

[0002] In the field of fluid transportation, water pumps, as core power equipment, convert electrical energy into fluid kinetic energy by driving an impeller with a motor. This enables the directional transport, elevation, or pressure increase of liquids such as water and oil. They are widely used in industrial circulation, agricultural irrigation, and domestic water supply. The stable operation of internal moving components such as motor bearings and transmission parts directly determines the overall working efficiency and lifespan. The oil chamber is a key structure providing lubrication and protection for the moving parts of mechanical equipment. It typically stores lubricating oil in a closed cavity, serving multiple functions including lubricating friction parts to reduce friction, removing heat to aid cooling, and isolating impurities to prevent contamination. It is an important auxiliary unit ensuring the long-term reliable operation of equipment.

[0003] The existing Chinese patent with authorization announcement number CN201013653Y discloses a cutting type submersible electric pump for sewage and sludge, including a motor, a pump body, a cylinder, and a sealing assembly. The motor and the pump body are connected through a sealed cylinder filled with mechanical oil. The motor shaft passes through the cylinder and extends into the pump body, where an impeller is connected. The sealing assembly includes a mechanical seal, which is installed in the cylinder and adopts a double-end face sealing structure.

[0004] The existing technical solutions mentioned above have the following defects: The oil chamber of the cutting-type sewage and sludge submersible electric pump has a built-in mechanical seal with a double-end face sealing structure. The mechanical seal includes two friction pairs, upper and lower. If the oil level in the oil chamber is lower than the upper friction pair surface, the upper friction pair will lose the lubrication and cooling effect of the mechanical oil, which will lead to dry friction. The upper friction pair surface of the mechanical seal will wear rapidly due to instantaneous high temperature, resulting in rapid failure of the mechanical seal. Utility Model Content

[0005] The present invention aims to address the aforementioned shortcomings in the prior art by providing a water pump with an internal oil chamber impeller, which solves the problem of reduced mechanical seal service life in the prior art.

[0006] The above-mentioned utility model objective is achieved through the following technical solution: a water pump with an internal impeller in an oil chamber, comprising a cylinder body having an internal oil chamber and a motor shaft penetrating the cylinder body. The cylinder body includes a cylinder seat and a cylinder cover disposed on the cylinder seat. A mechanical seal is disposed in the oil chamber and fitted onto the motor shaft. The mechanical seal includes a lower stationary ring, a lower moving ring, an elastic element, an upper moving ring, and an upper stationary ring arranged sequentially from bottom to top. A lower groove for interference fit of the lower stationary ring is formed on the upper surface of the cylinder seat. An upper groove for interference fit of the upper stationary ring is formed on the lower surface of the cylinder cover. A plurality of lower oil passage holes are formed along the thickness direction of the lower moving ring. A plurality of upper oil passage holes are formed along the thickness direction of the upper moving ring. An impeller is disposed in the oil chamber, fitted onto the motor shaft and located inside the elastic element. An oil pressure cover is disposed in the oil chamber, fitted onto the outside of the mechanical seal and the impeller. A plurality of oil passage holes are formed on the outer wall of the oil pressure cover.

[0007] The present invention is further configured such that: a plurality of connecting posts are provided on the bottom surface of the cylinder head, the bottom surface of the connecting posts abuts against the inner bottom wall of the cylinder seat, a connecting screw hole is provided on the bottom surface of the connecting posts, a countersunk hole is provided on the bottom surface of the cylinder seat corresponding to the connecting screw hole, a connecting screw that is threadedly connected to the connecting screw hole is passed through the countersunk hole, and a connecting sealing ring is fitted on the connecting screw.

[0008] The present invention is further configured such that: a sealing gasket is provided between the cylinder seat and the cylinder head, the upper surface of the sealing gasket is raised to form an upper convex sealing ring, the lower surface of the cylinder head is provided with an upper sealing groove for the upper convex sealing ring to be embedded, the lower surface of the sealing gasket is raised to form a lower convex sealing ring, and the upper surface of the cylinder seat is provided with a lower sealing groove for the lower convex sealing ring to be embedded.

[0009] The present invention is further configured such that: the lower surface of the lower moving ring protrudes downward to form a lower convex ring, the lower convex ring and the lower stationary ring form a lower friction pair, and a gap for mechanical oil to pass through is formed between the lower moving ring and the lower stationary ring; the upper surface of the upper moving ring protrudes downward to form an upper convex ring, the upper convex ring and the upper stationary ring form an upper friction pair, and a gap for mechanical oil to pass through is formed between the upper moving ring and the upper stationary ring.

[0010] The present invention is further configured such that: the lower moving ring has a plurality of lower oil passage holes along the thickness direction; a lower rubber pad fitted on the motor shaft is provided above the lower moving ring; the lower rubber pad has a lower opening along the thickness direction that communicates with the lower oil passage holes; the upper moving ring has a plurality of upper oil passage holes along the thickness direction; an upper rubber pad fitted on the motor shaft is provided below the upper moving ring; the upper rubber pad has an upper opening along the thickness direction that communicates with the upper oil passage holes; the lower end of the elastic element is fitted on the lower rubber pad; and the upper end of the elastic element is fitted on the upper rubber pad.

[0011] The present invention is further configured such that: the impeller includes a hub and blades, the hub is coaxially mounted on the motor shaft by means of a key connection, the lower end of the hub abuts against the lower rubber pad, and the upper end of the hub abuts against the upper rubber pad.

[0012] The present invention is further configured such that: a plurality of locking seats are provided on the upper surface of the cylinder seat, and locking screw holes are provided on the top surface of the locking seats; a connecting plate is provided at the bottom of the outer side wall of the oil pressure cover, and a plurality of locking screws threadedly connected to the locking seats are provided on the connecting plate.

[0013] The present invention is further configured as follows: an oil injection valve is provided on the outer wall of the cylinder seat. The oil injection valve includes a valve body and a valve cover. The valve body is provided on the outer wall of the cylinder seat. On the end face of the valve body facing the valve cover, a flange groove, an oil passage cavity, and an oil outlet are sequentially opened in the direction away from the valve cover. The oil outlet penetrates the cylinder seat and communicates with the oil chamber. A valve seat is interference-fitted at the end of the oil passage cavity near the valve cover. A limiting flange is provided on the outer wall of the valve seat and engages with the flange groove. An inner oil inlet hole is provided through the center of the valve seat. A sealing protrusion ring is provided on the end face of the valve seat away from the valve cover. The valve cover is threaded to the valve body and presses the limiting flange into the flange groove. An outer oil inlet hole is provided through the center of the valve cover. A valve disc is slidably arranged in the oil passage cavity. A top disc spring is provided in the oil passage cavity for pushing the valve disc to block the inner oil inlet hole and pressing against the sealing protrusion ring.

[0014] The present invention is further configured such that: a valve groove is provided on the end face of the valve disc away from the valve seat; a plurality of fixed seats are provided on the end face of the oil passage cavity away from the valve seat; a spring groove is provided on the fixed seat; one end of the top valve spring is embedded in the valve groove; and the other end is embedded in the spring groove.

[0015] The present invention is further configured such that: a plurality of guide blocks are provided on the cavity wall of the oil passage cavity, and a plurality of limiting platforms are provided on the outer side wall of the valve disc, and the limiting platforms are provided with guide grooves that slide in cooperation with the guide blocks.

[0016] In summary, the beneficial technical effects of this utility model are as follows: (1) The water pump with an internal impeller in this oil chamber can make the mechanical oil form a rapid flow circulation, accelerate the removal of heat generated by the lower friction pair, and can continuously pressurize the mechanical oil even when the oil level is low, so that the mechanical oil is sprayed onto the upper stationary ring to lubricate and cool the upper friction pair, thereby improving the reliability of the water pump and extending its service life. (2) Compared with the "screw plug + oil plug gasket" oil filling structure used in traditional water pumps, the water pump with the impeller inside the oil chamber is equipped with an oil filling valve, so that the screw plug does not need to be removed during oil filling, which completely eliminates the tedious operation of repeatedly unscrewing and disassembling parts and greatly improves maintenance efficiency. At the same time, since it does not rely on the oil plug gasket for sealing, it fundamentally avoids the sealing failure problem caused by the aging and deformation of the oil plug gasket in traditional water pumps due to long-term use, effectively reduces the risk of oil leakage failure, significantly extends the overall service life and maintenance cycle of the water pump, and reduces the user's later maintenance costs. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the water pump with an internal impeller in the oil well of this utility model; Figure 2 This is a cross-sectional view of the internal impeller structure of the oil well in this utility model; Figure 3 yes Figure 2 Enlarged view of point A in the middle; Figure 4 This is an exploded structural diagram of the cylinder body in this utility model; Figure 5 yes Figure 2 Enlarged view of point B in the middle; Figure 6 This is a schematic diagram of the cylinder seat structure in this utility model; Figure 7 This is a schematic diagram of the impeller structure in this utility model; Figure 8 yes Figure 2 Enlarged view of point C in the middle; Figure 9 This is an exploded structural diagram of the oil injection valve in this utility model; Figure 10 This is a schematic diagram of the valve body in this utility model.

[0018] In the above attached figures: 1. Cylinder block; 11. Cylinder seat; 12. Cylinder head; 2. Oil chamber; 3. Motor shaft; 4. Connecting column; 5. Connecting screw hole; 6. Countersunk hole; 7. Connecting screw; 8. Connecting seal ring; 9. Sealing gasket; 10. Upper convex seal ring; 13. Upper sealing groove; 14. Lower convex seal ring; 15. Lower sealing groove; 16. Lower stationary ring; 17. Lower moving ring; 18. Elastic element; 19. Upper moving ring; 20. Upper stationary ring; 21. Lower groove; 22. Lower convex ring; 23. Lower rubber gasket; 231. Lower opening; 24. Lower oil passage hole; 25. Upper groove; 26. Upper convex ring; 27. Upper rubber gasket; 271. 1. Top opening; 28. Top oil passage hole; 30. Impeller; 31. Hub; 32. Blade; 33. Oil pressure cover; 34. Oil passage hole; 35. Locking seat; 36. Connecting plate; 37. Locking screw; 38. Oil injection valve; 39. Valve body; 40. Valve cover; 41. External oil inlet hole; 42. Flanged groove; 43. Oil passage chamber; 44. Oil outlet hole; 45. Valve seat; 46. Seat sealing ring; 47. Limiting flange; 48. Fixed seat; 49. Spring groove; 50. Guide block; 51. Internal oil inlet hole; 52. Sealing convex ring; 53. Valve disc; 54. Rotating platform; 55. Guide groove; 56. Disc groove; 57. Top disc spring. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this utility model clearer and easier to understand, the present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0020] like Figure 1 and 2 As shown, this utility model proposes a water pump with an internal oil chamber impeller, including a cylinder 1 having an internal oil chamber 2 and a motor shaft 3 passing through the cylinder 1.

[0021] like Figure 4 As shown, the cylinder body 1 includes a cylinder seat 11 and a cylinder head 12 mounted on the cylinder seat 11. Four rectangularly distributed connecting posts 4 are fixedly connected to the bottom surface of the cylinder head 12. The bottom surface of the connecting posts 4 abuts against the inner bottom wall of the cylinder seat 11, and connecting screw holes 5 are formed on the bottom surface of the connecting posts 4. A countersunk hole 6 is formed on the bottom surface of the cylinder seat 11 corresponding to the connecting screw hole 5. A connecting screw 7, threaded into the countersunk hole 6 and connected to the connecting screw hole 5, is threaded through the countersunk hole 6. A connecting sealing ring 8 is fitted onto the connecting screw 7.

[0022] like Figure 3 As shown, an annular sealing gasket 9 is provided between the cylinder seat 11 and the cylinder head 12. The upper surface of the sealing gasket 9 protrudes to form an annular upper convex sealing ring 10. The lower surface of the cylinder head 12 is provided with an upper sealing groove 13 for the upper convex sealing ring 10 to be embedded. The lower surface of the sealing gasket 9 protrudes downward to form an annular lower convex sealing ring 14. The upper surface of the cylinder seat 11 is provided with a lower sealing groove 15 for the lower convex sealing ring 14 to be embedded.

[0023] like Figure 5 As shown, a mechanical seal is installed in the oil chamber 2 and mounted on the motor shaft 3. The mechanical seal includes a lower stationary ring 16, a lower moving ring 17, a lower rubber pad 23, an elastic element 18, an upper rubber pad 27, an upper moving ring 19, and an upper stationary ring 20 arranged sequentially from bottom to top.

[0024] like Figure 5 As shown, the upper surface of the cylinder seat 11 is provided with a lower groove 21 for the lower stationary ring 16 to be interference-fitted. The lower moving ring 17 is fitted onto the motor shaft 3 by interference fit. During assembly, the interference fit is achieved by heating the lower moving ring 17 (thermal expansion) or cooling the motor shaft 3 (cold contraction). The lower surface of the lower moving ring 17 protrudes to form a circular lower convex ring 22. The lower convex ring 22 and the lower stationary ring 16 form a lower friction pair. By setting the lower convex ring 22, a gap is formed between the lower moving ring 17 and the lower stationary ring 16 for the passage of mechanical oil.

[0025] like Figure 5 As shown, the lower moving ring 17 has a plurality of lower oil passage holes 24 along its thickness direction. The plurality of lower oil passage holes 24 are equidistantly distributed in a circle with the axis of the lower moving ring 17 as the center, and the lower oil passage holes 24 are circular holes. A lower rubber pad 23 is provided above the lower moving ring 17 and is fitted onto the motor shaft 3. The lower rubber pad 23 has a lower opening 231 along its thickness direction that communicates with the lower oil passage holes 24.

[0026] like Figure 5 As shown, the lower surface of the cylinder head 12 has an upper groove 25 for the upper stationary ring 20 to be interference-fitted. The upper moving ring 19 is fitted onto the motor shaft 3 by interference fit. During assembly, the interference fit is achieved by heating the upper moving ring 19 (thermal expansion) or cooling the motor shaft 3 (cold contraction). The upper surface of the upper moving ring 19 protrudes to form a circular upper convex ring 26. The upper convex ring 26 and the upper stationary ring 20 form an upper friction pair. By setting the upper convex ring 26, a gap is formed between the upper moving ring 19 and the upper stationary ring 20 for the passage of mechanical oil.

[0027] like Figure 5 As shown, the upper moving ring 19 has a plurality of upper oil passage holes 28 along its thickness direction. The plurality of upper oil passage holes 28 are equidistantly distributed in a circle with the axis of the upper moving ring 19 as the center. The upper oil passage holes 28 are conical holes with the small end facing the upper stationary ring 20. Below the upper moving ring 19, an upper rubber pad 27 is provided and fitted onto the motor shaft 3. The upper rubber pad 27 has an upper opening 271 along its thickness direction that communicates with the upper oil passage holes 28.

[0028] like Figure 5As shown, the elastic element 18 is a spring in a compressed state. The lower end of the spring is fitted onto the lower rubber pad 23, and the upper end of the spring is fitted onto the upper rubber pad 27. The elastic force generated by the spring returning to its original position is applied to the lower moving ring 17 and the upper moving ring 19, thereby keeping the lower convex ring 22 and the lower stationary ring 16, and the upper convex ring 26 and the upper stationary ring 20 in a tight state.

[0029] like Figure 5 and 7 As shown, an impeller 30 is installed in the oil chamber 2 and mounted on the motor shaft 3. The impeller 30 is located inside the elastic element 18. The impeller 30 includes a hub 31 and blades 32. The cylindrical hub 31 is coaxially mounted on the motor shaft 3 by means of a key connection. The lower end of the hub 31 abuts against the lower rubber pad 23, and the upper end of the hub 31 abuts against the upper rubber pad 27. Thus, the impeller 30 is restricted from axial and circumferential displacement relative to the motor shaft 3. There are three blades 32, which are equidistantly distributed in a circle.

[0030] like Figure 5 and 6 As shown, an oil pressure cover 33 is installed inside the oil chamber 2, sleeved on the outside of the mechanical seal and impeller 30. The oil pressure cover 33 is cylindrical, and several oil passage holes 34 are equidistantly opened on the outer circumference of the outer wall of the oil pressure cover 33. Several locking seats 35 are fixedly connected to the upper surface of the cylinder seat 11, and locking screw holes are opened on the top surface of the locking seats 35. A disc-shaped connecting plate 36 is fixedly connected to the bottom of the outer wall of the oil pressure cover 33. Several locking screws 37 are threaded onto the connecting plate 36 and connected to the locking seats 35. The locking screws 37 press the connecting plate 36 tightly onto the locking seats 35, thereby fixing the oil pressure cover 33.

[0031] When the water pump with an internal impeller is working, the motor shaft 3 is driven to rotate by the motor. The motor shaft 3 drives the lower moving ring 17, the upper moving ring 19, and the impeller 30 to rotate. The mechanical oil outside the pressure oil cover 33 enters the interior of the pressure oil cover 33 through the oil passage hole 34. One path of the mechanical oil is to flow directly to the impeller 30, and the other path is to pass through the gap between the lower moving ring 17 and the lower stationary ring 16 and the lower oil passage hole 24 in sequence. During this process, the mechanical oil will carry away the heat generated by the lower moving ring 17 due to the lower friction pair. Then the impeller 30 pressurizes the mechanical oil at the low oil level. The pressurized mechanical oil is pressurized again through the conical upper oil passage hole 28 and finally sprayed onto the upper stationary ring 20 to lubricate and cool the upper friction pair.

[0032] This water pump with an internal impeller allows the mechanical oil to circulate rapidly, accelerating the removal of heat generated by the lower friction pair. Even at low oil levels, it can continuously pressurize the mechanical oil, allowing it to be sprayed onto the upper stationary ring 20 to lubricate and cool the upper friction pair. This improves the reliability of the water pump and extends its service life.

[0033] like Figure 8As shown, an oil injection valve 38 is provided on the outer wall of the cylinder seat 11. The oil injection valve 38 includes a valve body 39 and a valve cover 40. The valve body 39 is cylindrical and fixedly connected to the cylinder seat 11. The outer wall of the valve body 39 has external threads, and the valve body 39 is threaded to the valve cover 40 through the external threads. An external oil inlet hole 41 is provided through the center of the valve cover 40. On the end face of the valve body 39 facing the valve cover 40, a flanged groove 42, an oil passage chamber 43, and an oil outlet hole 44 are sequentially provided in the direction away from the valve cover 40. The oil outlet hole 44 passes through the cylinder seat 11 and communicates with the oil chamber 2.

[0034] like Figure 8 As shown, a valve seat 45 is interference-fitted into the oil passage cavity 43 near the valve cover 40. A seat sealing ring 46 is fitted onto the valve seat 45, forming a seal between the valve seat 45 and the valve body 39. A limiting flange 47 is fixedly connected to the outer wall of the valve seat 45. The limiting flange 47 is engaged with the flange groove 42. The valve cover 40 presses the limiting flange 47 into the flange groove 42, thereby restricting the axial displacement of the valve seat 45 along the valve body 39.

[0035] like Figure 9 and 10 As shown, three equally spaced circumferentially distributed fixed seats 48 are fixedly connected to the end face of the oil passage cavity 43 away from the valve seat 45. The fixed seats 48 are provided with spring grooves 49. Three equally spaced circumferentially distributed guide blocks 50 are fixedly connected to the cavity wall of the oil passage cavity 43. The ends of the guide blocks 50 are fixedly connected to the fixed seats 48.

[0036] like Figure 8 and 9 As shown, an inner oil inlet hole 51, communicating with the outer oil inlet hole 41 and the oil passage cavity 43, is provided through the center of the valve seat 45. A circular sealing convex ring 52 is fixedly connected to the end face of the valve seat 45 away from the valve cover 40. A valve disc 53 is slidably disposed at the center of the oil passage cavity 43. Three equidistantly distributed circumferential limiting platforms 54 are fixedly connected to the outer wall of the valve disc 53. A guide groove 55 is provided on the limiting platform 54 to slide with the guide block 50. A disc groove 56 is provided on the end face of the valve disc 53 away from the valve seat 45. A top disc spring 57 is provided between the fixed seat 48 and the valve disc 53. One end of the top disc spring 57 is embedded in the disc groove 56, and the other end is embedded in the spring groove 49. The top disc spring 57 is used to push the valve disc 53 to block the inner oil inlet hole 51 and press against the sealing convex ring 52.

[0037] The detailed oil injection process in this embodiment is as follows: The worker aligns the outlet of the oil injection gun with the outer oil inlet 41. The high-pressure mechanical oil impacts the valve disc 53, pushing the valve disc 53 to separate from the valve seat 45. The mechanical oil flows through the oil passage 43 and the oil outlet 44 in sequence and then enters the oil chamber 2. After the oil injection stops, the top valve spring 57 pushes the valve disc 53 to block the inner oil inlet 51 and presses against the sealing convex ring 52.

[0038] Compared to the traditional "screw plug + plug gasket" oil filling structure used in water pumps, this water pump with an internal impeller and oil chamber uses an oil filling valve 38, eliminating the need to remove the screw plug during oil filling. This completely eliminates the tedious operation of repeatedly unscrewing and disassembling parts, significantly improving maintenance efficiency. At the same time, because it does not rely on the plug gasket for sealing, it fundamentally avoids the sealing failure problem caused by the aging and deformation of the plug gasket in traditional water pumps over long-term use. This effectively reduces the risk of oil leakage, significantly extends the overall service life and maintenance cycle of the water pump, and reduces the user's later maintenance costs.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A water pump with an internal oil chamber and an impeller, comprising a cylinder (1) having an internal oil chamber (2) and a motor shaft (3) penetrating the cylinder (1), characterized in that: The cylinder body (1) includes a cylinder seat (11) and a cylinder head (12) disposed on the cylinder seat (11). A mechanical seal is disposed in the oil chamber (2) and fitted onto the motor shaft (3). The mechanical seal includes a lower stationary ring (16), a lower moving ring (17), an elastic element (18), an upper moving ring (19), and an upper stationary ring (20) arranged sequentially from bottom to top. The upper surface of the cylinder seat (11) is provided with a lower groove (21) for the lower stationary ring (16) to be interference-fitted into, and the lower surface of the cylinder head (12) is provided with a groove for the upper stationary ring to be interference-fitted into. (20) An interference fit upper groove (25), a lower moving ring (17) with several lower oil passage holes (24) along the thickness direction, an upper moving ring (19) with several upper oil passage holes (28) along the thickness direction, an impeller (30) fitted on the motor shaft (3) and located inside the elastic element (18) is provided in the oil chamber (2), an oil pressure cover (33) fitted on the outside of the mechanical seal and the impeller (30) is provided in the oil chamber (2), and several oil passage holes (34) are provided on the outer wall of the oil pressure cover (33).

2. A water pump with an internal impeller in an oil chamber according to claim 1, characterized in that: The cylinder head (12) has several connecting posts (4) on its bottom surface. The bottom surface of the connecting posts (4) abuts against the inner bottom wall of the cylinder seat (11). The bottom surface of the connecting posts (4) has connecting screw holes (5). The bottom surface of the cylinder seat (11) has countersunk holes (6) corresponding to the connecting screw holes (5). A connecting screw (7) threaded into the countersunk hole (6) and connected to the connecting screw hole (5) is threaded through it. A connecting sealing ring (8) is fitted on the connecting screw (7).

3. A water pump with an internal impeller in an oil chamber according to claim 1, characterized in that: A sealing gasket (9) is provided between the cylinder seat (11) and the cylinder head (12). The upper surface of the sealing gasket (9) is raised to form an upper convex sealing ring (10). The lower surface of the cylinder head (12) is provided with an upper sealing groove (13) for the upper convex sealing ring (10) to be inserted. The lower surface of the sealing gasket (9) is raised downward to form a lower convex sealing ring (14). The upper surface of the cylinder seat (11) is provided with a lower sealing groove (15) for the lower convex sealing ring (14) to be inserted.

4. A water pump with an internal impeller in an oil chamber according to claim 1, characterized in that: The lower surface of the lower moving ring (17) protrudes downward to form a lower convex ring (22), and the lower convex ring (22) and the lower stationary ring (16) form a lower friction pair. A gap for mechanical oil to pass through is formed between the lower moving ring (17) and the lower stationary ring (16). The upper surface of the upper moving ring (19) protrudes to form an upper convex ring (26), and the upper convex ring (26) and the upper stationary ring (20) form an upper friction pair. A gap for mechanical oil to pass through is formed between the upper moving ring (19) and the upper stationary ring (20).

5. A water pump with an internal impeller in an oil chamber according to claim 1, characterized in that: The lower moving ring (17) has several lower oil passage holes (24) along its thickness direction. A lower rubber pad (23) is provided above the lower moving ring (17) and fitted onto the motor shaft (3). The lower rubber pad (23) has a lower opening (231) along its thickness direction that communicates with the lower oil passage holes (24). The upper moving ring (19) has several upper oil passage holes (28) along its thickness direction. An upper rubber pad (27) is provided below the upper moving ring (19) and fitted onto the motor shaft (3). The upper rubber pad (27) has an upper opening (271) along its thickness direction that communicates with the upper oil passage holes (28). The lower end of the elastic element (18) is fitted onto the lower rubber pad (23), and the upper end of the elastic element (18) is fitted onto the upper rubber pad (27).

6. A water pump with an internal impeller in an oil chamber according to claim 5, characterized in that: The impeller (30) includes a hub (31) and blades (32). The hub (31) is coaxially mounted on the motor shaft (3) by means of a key connection. The lower end of the hub (31) abuts against the lower rubber pad (23), and the upper end of the hub (31) abuts against the upper rubber pad (27).

7. A water pump with an internal impeller in an oil chamber according to claim 1, characterized in that: The upper surface of the cylinder seat (11) is provided with several locking seats (35), and the top surface of the locking seats (35) is provided with locking screw holes. The bottom of the outer wall of the oil pressure cover (33) is provided with a connecting plate (36), and several locking screws (37) that are threadedly connected to the locking seats (35) are provided on the connecting plate (36).

8. A water pump with an internal impeller in an oil chamber according to claim 1, characterized in that: An oil injection valve (38) is provided on the outer wall of the cylinder seat (11). The oil injection valve (38) includes a valve body (39) and a valve cover (40). The valve body (39) is located on the outer wall of the cylinder seat (11). On the end face of the valve body (39) facing the valve cover (40), a flanged groove (42), an oil passage chamber (43), and an oil outlet hole (44) are sequentially opened in the direction away from the valve cover (40). The oil outlet hole (44) passes through the cylinder seat (11) and communicates with the oil chamber (2). A valve seat (45) is interference-fitted at the end of the oil passage chamber (43) near the valve cover (40). The outer wall of the valve seat (45) is provided with a flanged groove (42). The valve seat (45) has an inner oil inlet hole (51) through the center of the valve seat (45) and a sealing ring (52) on the end face of the valve seat (45) away from the valve cover (40). The valve cover (40) is threaded to the valve body (39) and presses the limiting flange (47) into the flange groove (42). The valve cover (40) has an outer oil inlet hole (41) through the center of the valve cover (40). A valve disc (53) is slidably arranged in the oil passage cavity (43). A top disc spring (57) is arranged in the oil passage cavity (43) to push the valve disc (53) to block the inner oil inlet hole (51) and press against the sealing ring (52).

9. A water pump with an internal impeller in an oil chamber according to claim 8, characterized in that: The valve disc (53) has a disc groove (56) on the end face away from the valve seat (45). The oil passage cavity (43) has several fixed seats (48) on the end face away from the valve seat (45). The fixed seats (48) have spring grooves (49). One end of the top disc spring (57) is embedded in the disc groove (56), and the other end is embedded in the spring groove (49).

10. A water pump with an internal impeller in an oil chamber according to claim 9, characterized in that: The oil passage cavity (43) is provided with a number of guide blocks (50) on its cavity wall, and the valve disc (53) is provided with a number of limit platforms (54) on its outer side wall. The limit platforms (54) are provided with guide grooves (55) that slide with the guide blocks (50).

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