A submersible pump with rotor seal combining engineering plastics and stainless steel

Abstract

This utility model discloses a submersible pump with a rotor seal combining engineering plastics and stainless steel. The pump includes a motor, a housing, a lower cover sealed to the housing, a bidirectional mechanical seal mechanism sealed to the lower cover, a rotating shaft disposed within the housing and extending from the bidirectional mechanical seal mechanism at its end, and blades disposed at the end of the rotating shaft. The bidirectional mechanical seal mechanism includes an upper sealing cover, a lower sealing cover sealed to the upper sealing cover, and a mechanical seal assembly sleeved on the rotating shaft. An oil cavity is formed between the upper and lower sealing covers. The mechanical seal assembly is located in the oil cavity and is used to seal the portion of the rotating shaft that passes through the upper and lower sealing covers. This utility model provides a submersible pump with a rotor seal combining engineering plastics and stainless steel, which effectively prevents external water from entering the motor by forming a closed oil cavity through the upper and lower sealing covers.

Description

Technical Field

[0001] This application relates to the field of water pump technology, and in particular to a submersible pump with a rotor seal combining engineering plastics and stainless steel. Background Technology

[0002] Traditional water pump seals use iron or stainless steel structures, relying on a single sealed cavity, with both the stator and rotor exposed to the same environment. During long-term underwater operation, the risk of seal failure is high, easily leading to moisture or water leakage short circuits in the stator windings, and wear of the rotor bearings due to insufficient lubrication or contaminant intrusion. Later, Chinese patent application number 2025217861054, entitled "A Bottom Suction Water Pump," appeared. While it solved the above problems, its use of a one-way mechanical seal exposes the lower mechanical seal and spring to the water environment, making them susceptible to corrosion and rust, especially in highly corrosive environments like seawater. Utility Model Content

[0003] To address the aforementioned issues, this technical solution provides a submersible pump with a rotor seal combining engineering plastics and stainless steel.

[0004] To achieve the above objectives, the technical solution is as follows:

[0005] A submersible pump with a rotor seal combining engineering plastics and stainless steel, comprising:

[0006] An electric motor includes a housing, a lower cover sealed to the housing, a bidirectional mechanical seal mechanism sealed to the lower cover, a rotating shaft disposed within the housing and having its end protruding from the bidirectional mechanical seal mechanism, and blades disposed at the end of the rotating shaft.

[0007] A bidirectional mechanical seal mechanism includes an upper sealing cover, a lower sealing cover sealed to the upper sealing cover, and a mechanical seal assembly sleeved on the rotating shaft. An oil cavity is formed between the upper sealing cover and the lower sealing cover. The mechanical seal assembly is located in the oil cavity and is used to seal the position where the rotating shaft passes through the upper sealing cover and the lower sealing cover.

[0008] As described above, in a submersible pump with a rotor seal combining engineering plastics and stainless steel, the mechanical seal assembly includes a rotating ring, a first stationary ring and a second stationary ring located at both ends of the rotating ring, an upper sealing ring disposed between the first stationary ring and the upper sealing cover, and a lower sealing ring disposed between the second stationary ring and the lower sealing cover.

[0009] As described above, in a submersible pump with a rotor seal combining engineering plastics and stainless steel, the motor further includes a protective cover disposed within the housing, a second filling cavity formed within the protective cover, a rotor disposed within the second filling cavity, a rotating shaft disposed on the rotor, and a channel communicating between the second filling cavity and the oil cavity provided on the upper sealing cover.

[0010] As described above, in a submersible pump with a rotor seal combining engineering plastics and stainless steel, the lower cover has a port for fitting outside the opening of the protective cover, and the upper sealing cover covers the port; the lower sealing cover has an oil drain port connecting the oil chamber to the outside, and a sealing screw for sealing the oil drain port.

[0011] As described above, in a submersible pump with a rotor seal combining engineering plastics and stainless steel, the upper sealing cover has a first through hole through which the rotating shaft passes. The upper sealing ring includes a main body, a sealing ring protruding from the periphery of the main body, and a groove recessed on one end face of the main body for embedding the first stationary ring.

[0012] As described above, in a rotor-sealed submersible pump combining engineering plastics and stainless steel, a first filling cavity is formed between the housing and the protective cover.

[0013] As described above, in a submersible pump with a rotor seal combining engineering plastics and stainless steel, the first filling chamber is used to fill a solid filler, and the second filling chamber is used to fill a liquid filler, wherein the solid filler includes resin oil and the liquid filler includes cooling lubricating oil.

[0014] The submersible pump with a rotor seal combining engineering plastics and stainless steel, as described above, further includes a pump body connected to the motor; the pump body is provided with a pumping chamber, and an outlet and an inlet communicating with the pumping chamber, and the blades are located in the pumping chamber.

[0015] As described above, in a submersible pump with a rotor seal combining engineering plastics and stainless steel, the protective cover opening has an edge extending outward in the circumferential direction, the sealing cover has a first groove, and a first sealing ring is provided between the edge and the first groove. When the sealing cover is connected to the lower cover, it is sealed by pressing the first sealing ring.

[0016] As described above, in a submersible pump with a rotor seal combining engineering plastics and stainless steel, the moving ring includes a ring body made of plastic, with top rings protruding from both ends of the ring body and a central groove in the middle of the ring body, the depth of which gradually decreases towards both ends of the ring body.

[0017] The beneficial effects of this application are:

[0018] This invention provides a submersible pump with a rotor seal combining engineering plastics and stainless steel. An upper and lower sealing cover form a closed oil chamber, with the mechanical seal assembly completely located within it. This provides a bidirectional seal at the point where the shaft passes through the upper and lower sealing covers. This structure effectively prevents external water (especially corrosive liquids such as seawater) from entering the motor, avoiding exposure to a water environment and thus preventing corrosion and rust problems. This significantly improves sealing performance and operational safety. Furthermore, the cooling lubricating oil in the oil chamber can cool the mechanical seal assembly, extending its service life. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0020] Figure 1 This is a diagram of the internal structure of this application;

[0021] Figure 2 for Figure 1 Enlarged view of point A. Detailed Implementation

[0022] To make the technical problems solved, 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.

[0023] A submersible pump with a rotor seal combining engineering plastics and stainless steel, comprising:

[0024] Motor 1 includes a housing 11, a lower cover 13 sealed to the housing 11, a bidirectional mechanical seal mechanism 9 sealed to the lower cover 13, a rotating shaft 18 disposed inside the housing 11 and with its end protruding from the bidirectional mechanical seal mechanism 9, and a blade 19 disposed at the end of the rotating shaft 18.

[0025] The bidirectional mechanical seal mechanism 9 includes an upper sealing cover 91, a lower sealing cover 92 that is sealed to the upper sealing cover 91, and a mechanical seal assembly 93 sleeved on the rotating shaft 18. An oil cavity 94 is formed between the upper sealing cover 91 and the lower sealing cover 92, and the mechanical seal assembly 93 is located in the oil cavity 94.

[0026] This invention provides a submersible pump with a rotor seal combining engineering plastics and stainless steel. An upper and lower sealing cover form a closed oil chamber, with the mechanical seal assembly completely located within it. This provides a bidirectional seal at the point where the shaft passes through the upper and lower sealing covers. This structure effectively prevents external water (especially corrosive liquids such as seawater) from entering the motor, avoiding exposure to a water environment and thus preventing corrosion and rust problems. This significantly improves sealing performance and operational safety. Furthermore, the cooling lubricating oil in the oil chamber can cool the mechanical seal assembly, extending its service life.

[0027] By setting up a sealed oil chamber formed by upper and lower sealing covers and completely immersing the entire mechanical seal assembly in the oil chamber, a two-way sealing barrier is constructed. This directly achieves two-way sealing protection at the shaft penetration point, effectively isolating the possibility of external media (especially corrosive liquids such as water) entering the motor from both ends. It fundamentally solves the problem in the prior art where one side of the seal is exposed to a harsh environment and corrodes and fails due to unidirectional sealing, significantly improving sealing reliability and the service life of the pump in corrosive environments.

[0028] Furthermore, as a preferred embodiment of this solution and not a limitation, the mechanical seal assembly 93 includes a dynamic ring 931, a first stationary ring 932 and a second stationary ring 933 located at both ends of the dynamic ring 931, an upper sealing ring 934 disposed between the first stationary ring 932 and the upper sealing cover 91, and a lower sealing ring 935 disposed between the second stationary ring 933 and the lower sealing cover 92. This ensures that effective dynamic seals (between the dynamic and stationary rings) and static seals (between the stationary ring and the sealing cover) are formed in both the upper and lower directions of the oil chamber, guaranteeing the absolute airtightness of the oil chamber. This evenly distributes the pressure or potential leakage risk from both the inside of the motor and the outside of the pump body, enhancing the stability and reliability of the seal.

[0029] Furthermore, as a preferred embodiment of this solution and not a limitation, the motor 1 further includes a protective cover 12 disposed within the housing 11. A second filling cavity 15 is formed within the protective cover 12, and a rotor 17 is disposed within the second filling cavity 15. The rotating shaft 18 is disposed on the rotor 17. The upper sealing cover 91 has a channel 911 connecting the second filling cavity 15 and the oil cavity 94. The rotor is placed in the second filling cavity filled with cooling lubricating oil, focusing on lubrication and heat dissipation, effectively preventing contaminant intrusion and improving service life.

[0030] Furthermore, as a preferred embodiment of this solution and not a limitation, the lower cover 13 is provided with a port 131 for fitting over the outside of the opening of the protective cover 12, and the upper sealing cover 91 covers the port 131; the lower sealing cover 92 is provided with an oil drain port 31 connecting the oil chamber 94 to the outside, and a sealing screw 32 for sealing the oil drain port 31. This facilitates the replacement of lubricating oil in the oil chamber or the removal of waste oil during maintenance, ensuring the cleanliness of the sealing medium, thereby maintaining the long-term effective sealing performance of the mechanical seal assembly.

[0031] Furthermore, as a preferred embodiment of this solution and not a limitation, the upper sealing cover 91 is provided with a first through hole 36 for the rotating shaft 18 to pass through. The upper sealing ring 934 includes a main body 9341, a sealing ring 9342 protruding from the periphery of the main body 9341, and a groove 9343 recessed on one end face of the main body 9341 for the first stationary ring 932 to be embedded. The groove design allows the first stationary ring to be accurately positioned and reliably fixed, preventing it from shifting or loosening during use and ensuring the fitting accuracy of the dynamic sealing surface. The design of the sealing ring directly enhances the static sealing effect between the upper sealing ring and the upper sealing cover, forming multiple sealing lines to effectively prevent liquid leakage along the axial direction.

[0032] Furthermore, as a preferred embodiment of this solution and not a limitation, a first filling cavity 14 is formed between the housing 11 and the protective cover 12. The stator and rotor are separated by using the protective cover to divide the first filling cavity and the second filling cavity. The stator is placed in the resin oil-filled first filling cavity, achieving insulation and moisture protection.

[0033] Furthermore, as a preferred embodiment of this solution and not a limitation, the first filling cavity 14 is used to fill solid filler, and the second filling cavity 15 is used to fill liquid filler, wherein the solid filler includes resin oil, and the liquid filler includes cooling lubricating oil. Solid filler (such as resin oil) is used to securely encapsulate, insulate, and dissipate heat from the stator in the first filling cavity; simultaneously, liquid filler (such as cooling lubricating oil) is used to lubricate and cool the rotor components in the second filling cavity and the mechanical seal assembly in the oil cavity. This differentiated filling strategy optimizes the working environment of various motor components, improving the motor's efficiency, lifespan, and reliability.

[0034] Furthermore, as a preferred embodiment of this solution, and not a limitation thereof, it also includes a pump body 2 connected to the motor 1; the pump body 2 is provided with a pumping chamber 21, and an outlet and an inlet 23 communicating with the pumping chamber 21, and the blades 19 are located in the pumping chamber 21. The motor drives the blades to rotate in the pumping chamber through a rotating shaft, thereby drawing liquid from the inlet and discharging it from the outlet, realizing the core working principle of the bottom suction pump.

[0035] Furthermore, as a preferred embodiment of this solution and not a limitation, the protective cover 12 has an edge 121 extending outward in the circumferential direction at its opening, and the upper sealing cover 91 has a first groove 33. A first sealing ring 34 is provided between the edge 121 and the first groove 33. When the upper sealing cover 91 is connected to the lower cover 13, a seal is achieved by pressing against the first sealing ring 34. A reliable sealing effect is directly established between the upper sealing cover and the protective cover. When the upper sealing cover and the lower cover are tightly connected, the compression of the first sealing ring can effectively prevent liquid in the second filling cavity from leaking outward, ensuring the sealing integrity of the internal environment of the motor.

[0036] Furthermore, as a preferred embodiment of this solution and not a limitation, the rotating ring 931 includes a ring body 9311 made of plastic, with top rings 9312 protruding from both ends of the ring body 9311, and a central groove 9313 in the middle of the ring body 9311. The depth of the central groove 9313 gradually decreases towards both ends of the ring body 9311. The top rings at both ends constitute the working surface of the friction pair with the double stationary rings. The gradual depth design of the central groove directly facilitates the better storage and distribution of lubricating oil in the oil cavity to the friction surface when the rotating ring rotates, playing a role in lubrication and heat dissipation. At the same time, this structure may help form a stable oil film in the groove, reducing wear and extending the seal life.

[0037] Traditional water pump seals use iron or stainless steel structures. In this embodiment, the protective cover is made of stainless steel, forming a second filling cavity to accommodate the rotor. The upper sealing cover is made of engineering fiber plastic, which, compared to traditional water pumps, reduces the overall weight and lowers production costs. Engineering plastics are corrosion-resistant, extending the overall lifespan. The lower sealing cover is made of stainless steel, which facilitates heat exchange between the oil chamber and the pumping chamber, reducing the temperature of the oil chamber.

[0038] The above description is only a preferred embodiment of this application and is not intended to limit the scope of implementation of this application. Any other embodiments whose principles and basic structures are the same as or similar to those of this application are within the protection scope of this application.

Claims

1. A submersible pump with a rotor seal combining engineering plastics and stainless steel, characterized in that: include The motor (1) includes a housing (11), a lower cover (13) sealed to the housing (11), a bidirectional mechanical seal mechanism (9) sealed to the lower cover (13), a rotating shaft (18) disposed inside the housing (11) and having its end protruding from the bidirectional mechanical seal mechanism (9), and a blade (19) disposed at the end of the rotating shaft (18); A bidirectional mechanical seal mechanism (9) includes an upper sealing cover (91), a lower sealing cover (92) sealed to the upper sealing cover (91), and a mechanical seal assembly (93) sleeved on the rotating shaft (18). An oil cavity (94) is formed between the upper sealing cover (91) and the lower sealing cover (92). The mechanical seal assembly (93) is located in the oil cavity (94) and is used to seal the position where the rotating shaft (18) passes through the upper sealing cover (91) and the lower sealing cover (92).

2. The submersible pump with a rotor seal combining engineering plastics and stainless steel according to claim 1, characterized in that: The mechanical seal assembly (93) includes a moving ring (931), a first stationary ring (932) and a second stationary ring (933) located at both ends of the moving ring (931), an upper sealing ring (934) disposed between the first stationary ring (932) and the upper sealing cover (91), and a lower sealing ring (935) disposed between the second stationary ring (933) and the lower sealing cover (92).

3. The submersible pump with a rotor seal combining engineering plastics and stainless steel according to claim 1, characterized in that: The motor (1) also includes a protective cover (12) disposed in the housing (11), a second filling cavity (15) is formed in the protective cover (12), a rotor (17) is disposed in the second filling cavity (15), the rotating shaft (18) is disposed on the rotor (17), and the upper sealing cover (91) is provided with a channel (911) connecting the second filling cavity (15) and the oil cavity (94).

4. The submersible pump with a rotor seal combining engineering plastics and stainless steel according to claim 3, characterized in that: The lower cover (13) is provided with a port (131) for fitting outside the opening of the protective cover (12), and the upper sealing cover (91) covers the port (131); the lower sealing cover (92) is provided with an oil drain port (31) connecting the oil chamber (94) to the outside, and a sealing screw (32) for sealing the oil drain port (31).

5. A submersible pump with a rotor seal combining engineering plastics and stainless steel according to claim 2, characterized in that: The upper sealing cover (91) is provided with a first through hole (36) through which the rotating shaft (18) passes. The upper sealing ring (934) includes a main body (9341), a sealing ring (9342) protruding from the periphery of the main body (9341), and a groove (9343) recessed on one end face of the main body (9341) for the first stationary ring (932) to be embedded.

6. A submersible pump with a rotor seal combining engineering plastics and stainless steel according to claim 3, characterized in that: A first filling cavity (14) is formed between the housing (11) and the protective cover (12).

7. A submersible pump with a rotor seal combining engineering plastics and stainless steel according to claim 6, characterized in that: The first filling cavity (14) is used to fill solid filler, and the second filling cavity (15) is used to fill liquid filler, wherein the solid filler includes resin oil and the liquid filler includes cooling lubricating oil.

8. The submersible pump with a rotor seal combining engineering plastics and stainless steel according to claim 1, characterized in that: It also includes a pump body (2) connected to the motor (1); the pump body (2) is provided with a water pumping chamber (21) and an outlet and an inlet (23) connecting the water pumping chamber (21), and the blade (19) is located in the water pumping chamber (21).

9. A submersible pump with a rotor seal combining engineering plastics and stainless steel according to claim 3, characterized in that: The protective cover (12) has an edge (121) extending outward in the circumferential direction at the opening. The upper sealing cover (91) has a first groove (33). A first sealing ring (34) is provided between the edge (121) and the first groove (33). When the upper sealing cover (91) is connected to the lower cover (13), the sealing is achieved by pressing the first sealing ring (34).

10. A submersible pump with a rotor seal combining engineering plastics and stainless steel according to claim 2, characterized in that: The moving ring (931) includes a ring body (9311) made of plastic, with top rings (9312) protruding from both ends of the ring body (9311) and a middle groove (9313) in the middle of the ring body (9311), the depth of which gradually decreases towards both ends of the ring body (9311).

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