Multistage sealing pump motor
By designing a multi-stage sealed pump motor and adopting a structure with multiple sealing groups, the problem of incompatibility of existing pump motor sealing structures was solved, achieving multi-stage sealing effect and flexible sealing switching, reducing production costs and improving user experience.
Patent Information
- Application Number
- CN202610025525.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-09
- Publication Date
- 2026-02-27
AI Technical Summary
The existing pump motor's sealing structure is incompatible, resulting in high manufacturing costs and the need to replace a large number of parts when changing scenarios, which affects the user experience.
Design a multi-stage sealed pump motor, including multiple sealing groups, each of which consists of different sealing elements. Through the multi-stage sealing structure of the motor front cover and oil seal cover, a multi-stage sealing effect is achieved, and the sealing degree can be switched at will according to the requirements.
It achieves multi-level sealing effect, adapts to different sealing requirements, reduces production costs, improves user experience, and requires no replacement of parts, offering high flexibility.
Smart Images
Figure CN121584929A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of water pump technology, and in particular to a multi-stage sealed pump motor. Background Technology
[0002] Water pumps are widely used for transporting municipal sewage / wastewater. During the operation of the water pump, sewage / wastewater will enter between the impeller and the front cover of the motor. In order to prevent water and impurities in the water from entering the motor, a sealing structure is generally set between the impeller and the front cover of the motor.
[0003] Because the composition and content of impurities in sewage / wastewater vary depending on the region or scenario, different sealing structures with varying degrees of sealing are generally required for different types of sewage / wastewater. Therefore, it is often necessary to adjust the sealing structure of the pump motor according to the specific region or customer requirements.
[0004] Currently, existing pump motors are not compatible with different sealing structures, and some parts need to be specially made, which increases manufacturing costs. Furthermore, they cannot be switched arbitrarily when changing scenarios, requiring the replacement of a large number of parts, which affects the customer's user experience. Summary of the Invention
[0005] The present invention aims to provide a multi-stage sealed pump motor to overcome the shortcomings of the prior art.
[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is: a multi-stage sealed pump motor, including a motor front cover, an oil seal cover, and a sealing mechanism. The motor front cover is located at the front end of the motor, and the oil seal cover is located at the front end of the motor front cover. The sealing mechanism includes multiple sealing groups, each of which includes sealing group one, sealing group two, and sealing group three arranged sequentially along the motor shaft axis. Each sealing group includes at least one sealing element. The rear end of the motor front cover has a sealing groove one for installing sealing group one. Sealing group two is located between the oil seal cover and the motor front cover. The front end of the motor front cover has a sealing groove two-one for installing sealing group two. The rear end of the oil seal cover has a sealing groove two-two for installing sealing group two. The front end of the oil seal cover has a sealing groove three for installing sealing group three. The outer diameters of sealing groove one, sealing groove two-one, sealing groove two-two, and sealing groove three are the same. An oil reservoir is located between the oil seal cover and the motor front cover, and sealing group two is located within the oil reservoir.
[0007] Furthermore, in the aforementioned multi-stage sealed pump motor, the oil seal cover is sealed to the front cover of the motor. The rear end of the oil seal cover is provided with a sealing boss, the front end of the front cover of the motor is provided with a sealing groove, the front end of the sealing groove is provided with a recess, the sealing boss is inserted into the sealing groove, and the sealing boss and the recess together form a sealing groove four. A sealing ring is provided inside the sealing groove four and fitted on the outside of the sealing boss.
[0008] Preferably, the oil seal cover has multiple mounting portions 1 on its rear peripheral side, each mounting portion 1 having a mounting hole. The motor front cover has multiple mounting portions 2 corresponding to the mounting portions 1, each mounting portion 2 having a threaded hole. The oil seal cover is detachably connected to the motor front cover by fasteners that pass through the mounting holes and are threadedly connected to the threaded holes.
[0009] Furthermore, in the aforementioned multi-stage sealed pump motor, the sealing groove 1, sealing groove 21, sealing groove 22, and sealing groove 3 are all spaced apart.
[0010] Furthermore, in the aforementioned multi-stage sealed pump motor, the sealing assembly one includes a skeleton oil seal one, the outer side of the skeleton oil seal one is interference-fitted with the sealing groove one, and the inner side of the skeleton oil seal one is interference-fitted with the motor shaft.
[0011] Furthermore, in the aforementioned multi-stage sealed pump motor, the sealing assembly two includes a skeleton oil seal two and a mechanical seal one arranged at intervals. The outer side of the skeleton oil seal two is interference-fitted with the sealing groove two one. The inner side of the skeleton oil seal two is provided with a sealing part one and a sealing part two in sequence from the outside to the inside. Both the sealing part one and the sealing part two are interference-fitted with the motor shaft. The mechanical seal one is installed on the sealing groove two two.
[0012] Furthermore, in the aforementioned multi-stage sealed pump motor, the sealing part one includes a cone ring one and a cone ring two. The cone ring one decreases in size sequentially from the outside to the inside. The cone ring two is located inside the cone ring one and increases in size sequentially from the outside to the inside. The cone ring one and the cone ring two are connected to form a V-shaped structure, and the tip of the V-shape is interference-fitted with the motor shaft. The sealing part two is a cone ring three protruding from the rear end of the cone ring two. The cone ring three is connected to the cone ring two by a circular arc transition and decreases in size sequentially from the outside to the inside.
[0013] Furthermore, in the aforementioned multi-stage sealed pump motor, the mechanical seal includes a stationary sealing ring and a rotating sealing ring. The stationary sealing ring is interference-fitted into the sealing groove. The rotating sealing ring mates with the stationary sealing ring, and the rear end of the rotating sealing ring is provided with a retaining ring to limit its axial displacement.
[0014] Furthermore, in the aforementioned multi-stage sealed pump motor, the sealing assembly two includes a mechanical seal two, which includes a sealing stationary ring two and a sealing rotating ring two. There are two sealing stationary rings two, which are respectively interference-fitted into sealing groove two one and sealing groove two two. The sealing rotating ring two includes two rotating rings and a spring connecting the two rotating rings. The two rotating rings are respectively engaged with one sealing stationary ring two.
[0015] Furthermore, in the aforementioned multi-stage sealed pump motor, the sealing assembly three includes a skeleton oil seal two. The outer side of the skeleton oil seal two is interference-fitted with the sealing groove three. The inner side of the skeleton oil seal two is provided with a sealing part one and a sealing part two in sequence from the outside to the inside. Both the sealing part one and the sealing part two are interference-fitted with the motor shaft.
[0016] Furthermore, in the aforementioned multi-stage sealed pump motor, the sealing assembly three includes a mechanical seal, which is mounted on a sealing groove three. The stationary sealing ring of the mechanical seal is interference-fitted into the sealing groove three. The rotating sealing ring of the mechanical seal engages with the stationary sealing ring, and the front end of the rotating sealing ring is provided with a ring to limit its axial displacement. This ring is made of stainless steel, and the other end of the ring is an impeller. The sealing assembly three is actually limited by the impeller and the ring, and the ring is used to space the sealing assembly three from the impeller.
[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention achieves a multi-level sealing effect through multiple sealing groups containing different sealing elements, resulting in a good sealing effect. Different sealing elements form sealing mechanisms with different sealing degrees, adapting to different sealing requirements. Furthermore, the motor front cover and oil seal cover can be compatible with the installation of different sealing elements. According to customer needs or usage scenarios, sealing mechanisms with different sealing degrees can be switched at will without replacing parts. This allows for mass production, reducing production costs, providing good flexibility, a wide range of applications, and improving the user experience. Attached Figure Description
[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, 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 recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 This is a schematic diagram of the external structure of the multi-stage sealed pump motor of the present invention; Figure 2 This is a schematic diagram of the structure of the first embodiment of the multi-stage sealed pump motor of the present invention; Figure 3 for Figure 2 A partial enlarged structural diagram of part A in the diagram; Figure 4 This is a schematic diagram of the second embodiment of the multi-stage sealed pump motor of the present invention; Figure 5 for Figure 4 A magnified schematic diagram of the B section in the diagram; Figure 6 This is a schematic diagram of the third embodiment of the multi-stage sealed pump motor of the present invention; Figure 7 for Figure 6 A magnified schematic diagram of the C-shaped structure in the diagram; Figure 8 This is a schematic diagram of the skeleton oil seal structure of the multi-stage sealed pump motor of the present invention; In the diagram: 1. Motor front cover; 11. Sealing groove one; 12. Sealing groove two-one; 13. Sealing slide groove; 14. Groove; 15. Mounting part two; 2. Oil seal cap; 21. Sealing groove 2; 22. Sealing groove 3; 23. Sealing boss; 24. Mounting part 1; 3. Motor shaft; 41. Sealing Group 1; 42. Sealing Group 2; 43. Sealing Group 3; 5. Sealing ring; 6. Oil seal with skeleton; 7. Oil seal skeleton two; 71. Conical ring one; 72. Conical ring two; 73. Conical ring three; 8. Mechanical seal component 1; 81. Stationary sealing ring 1; 82. Dynamic sealing ring 1; 9. Mechanical seal component two; 91. Stationary sealing ring two; 92. Dynamic sealing ring two; 10. Circular ring. Detailed Implementation
[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0021] Example like Figure 1-8As shown, a multi-stage sealed pump motor includes a motor front cover 1, an oil seal cover 2, and a sealing mechanism. The motor front cover 1 is located at the front end of the motor, and the oil seal cover 2 is located at the front end of the motor front cover 1, with the front end being the end furthest from the motor interior. The sealing mechanism includes multiple sealing groups, which include sealing group one 41, sealing group two 42, and sealing group three 43 arranged sequentially along the motor shaft 3. Each sealing group includes at least one sealing element, achieving a multi-stage sealing effect. The rear end of the motor front cover 1 is provided for mounting sealing group one. Sealing groove 11 and sealing assembly 42 are located between oil seal cover 2 and motor front cover 1. The front end of motor front cover 1 has sealing groove 12 for installing sealing assembly 42, the rear end of oil seal cover 2 has sealing groove 21 for installing sealing assembly 42, and the front end of oil seal cover 2 has sealing groove 22 for installing sealing assembly 43. Sealing grooves 11, 12, 21, and 22 have the same outer diameter, allowing for the installation of different seals to meet various sealing requirements. Furthermore, an oil reservoir is located between oil seal cover 2 and motor front cover 1, with sealing assembly 42 positioned within it, which rotates the oil in the reservoir for lubrication.
[0022] like Figure 2 , Figure 4 , Figure 7-8 As shown, the oil seal cover 2 is sealed to the front cover 1 of the motor to seal the oil tank and prevent oil leakage. Specifically, the rear end of the oil seal cover 2 is provided with a sealing boss 23, the front end of the front cover 1 of the motor is provided with a sealing groove 13, the front end of the sealing groove 13 is provided with a groove 14, the sealing boss 23 is inserted into the sealing groove 13, and the sealing boss 23 closes the groove 14, and the groove 14 forms a sealing groove four. A sealing ring 5 is provided inside the sealing groove four and is fitted on the outside of the sealing boss 23.
[0023] In the above structure, such as Figure 1-2 As shown, the rear peripheral side of the oil seal cover 2 is provided with multiple mounting parts 1 24, and the mounting parts 1 24 are provided with mounting holes. The motor front cover 1 is provided with multiple mounting parts 2 15 corresponding to the mounting parts 1 24, and the mounting parts 2 15 are provided with threaded holes. The oil seal cover 2 is detachably connected to the motor front cover 1 by fasteners that pass through the mounting holes and are threaded to the threaded holes. The installation is simple, and the sealing ring is located inside the connection between the motor front cover 1 and the oil seal cover 2, ensuring the sealing effect.
[0024] Among them, such as Figure 2-7 As shown, sealing groove 11, sealing groove 21, sealing groove 22 and sealing groove 3 are all spaced apart to avoid mutual friction between the sealing groups and extend the service life of the sealing groups.
[0025] In one embodiment, such as Figure 2-3As shown, the sealing assembly 41 includes a skeleton oil seal 6. The outer and inner sides of the skeleton oil seal 6 are cylindrical and are adapted to the shape of the sealing groove 1 and the motor shaft. Specifically, the outer side of the skeleton oil seal 6 is interference-fitted with the sealing groove 11, and the inner side of the skeleton oil seal 6 is interference-fitted with the motor shaft 3 to achieve a first-level sealing effect.
[0026] Sealing assembly 2 42 includes a skeleton oil seal 2 7 and a mechanical seal 1 8. The skeleton oil seal 2 7 and the mechanical seal 1 8 are spaced apart to avoid mutual friction and ensure the sealing effect of sealing assembly 2. The outer side of the skeleton oil seal 2 7 is interference-fitted with the sealing groove 2 12. The inner side of the skeleton oil seal 2 7 is provided with sealing part 1 and sealing part 2 in sequence from the outside to the inside. Both sealing part 1 and sealing part 2 are interference-fitted with the motor shaft 3. The mechanical seal 1 8 is installed on the sealing groove 2 21.
[0027] In the above structure, such as Figure 3 , Figure 8 As shown, sealing part one includes a first conical ring 71 and a second conical ring 72. The first conical ring 71 decreases in size from the outside to the inside, while the second conical ring 72 is located inside the first conical ring 71 and increases in size from the outside to the inside. The first conical ring 71 and the second conical ring 72 are connected to form a V-shaped structure, and the tip of the V-shape is interference-fitted with the motor shaft 3. The radial interference is large, and the contact area with the motor shaft is small, which can prolong the sealing time. Sealing part two is a third conical ring 73 protruding from the rear end of the second conical ring 72. The third conical ring 73 is connected to the second conical ring 72 by a rounded transition and decreases in size from the outside to the inside. By setting the first conical ring 71, the second conical ring 72, and the third conical ring 73, a double-layer sealing effect can be achieved, with good sealing performance. In addition, the large radial interference and small contact area of the first and second sealing parts interference-fitted with the motor shaft can reduce frictional heat generation when the motor shaft rotates, thereby avoiding aging of the second skeleton oil seal and extending its service life.
[0028] Mechanical seal 8 includes a stationary sealing ring 81 and a rotating sealing ring 82. The stationary sealing ring 81 is interference-fitted into the sealing groove 221. The rotating sealing ring 82 is fitted with the stationary sealing ring 81, and the rear end of the rotating sealing ring 82 is provided with a retaining ring (not shown in the figure) to limit its axial displacement. The motor shaft 3 is provided with a retaining groove for installing the retaining ring.
[0029] like Figure 3 As shown, sealing assembly 3 43 includes a skeleton oil seal 2. The outer side of the skeleton oil seal 2 7 is interference-fitted with the sealing groove 3 22. The inner side of the skeleton oil seal 2 7 is provided with sealing part 1 and sealing part 2 in sequence from the outside to the inside. Both sealing part 1 and sealing part 2 are interference-fitted with the motor shaft 3. The interference fit between the skeleton oil seal 7 of sealing assembly 3 43 and the motor shaft 3 is the same as the interference fit between the skeleton oil seal 7 of sealing assembly 2 42 and the motor shaft 3, and will not be described in detail here.
[0030] In the second embodiment, as Figure 4-5 As shown, the sealing assembly 41 includes a skeleton oil seal 6. The outer and inner sides of the skeleton oil seal 6 are cylindrical and are adapted to the shape of the sealing groove 1 and the motor shaft. Specifically, the outer side of the skeleton oil seal 6 is interference-fitted with the sealing groove 11, and the inner side of the skeleton oil seal 6 is interference-fitted with the motor shaft 3 to achieve a first-level sealing effect.
[0031] The sealing assembly 42 includes a mechanical seal 9, which includes a stationary sealing ring 91 and a rotating sealing ring 92. There are two stationary sealing rings 91, which are respectively interference-fitted into the sealing groove 12 and the sealing groove 21. The rotating sealing ring 92 includes two rotating rings and a spring connecting the two rotating rings. The two rotating rings are respectively engaged with one stationary sealing ring 91.
[0032] The sealing assembly 3 43 includes a skeleton oil seal 2. The outer side of the skeleton oil seal 2 7 is interference-fitted with the sealing groove 3 22. In this embodiment, the inner structure of the skeleton oil seal 2 7 and its sealing structure with the motor shaft are the same as described above, and will not be described in detail here.
[0033] In the third embodiment, as Figure 6-7 As shown, the sealing assembly 41 includes a skeleton oil seal 6. The outer and inner sides of the skeleton oil seal 6 are cylindrical and are adapted to the shape of the sealing groove 1 and the motor shaft. Specifically, the outer side of the skeleton oil seal 6 is interference-fitted with the sealing groove 11, and the inner side of the skeleton oil seal 6 is interference-fitted with the motor shaft 3 to achieve a first-level sealing effect.
[0034] The sealing assembly 42 includes a mechanical seal 9, which includes a stationary sealing ring 91 and a rotating sealing ring 92. There are two stationary sealing rings 91, which are respectively interference-fitted into the sealing groove 12 and the sealing groove 21. The rotating sealing ring 92 includes two rotating rings and a spring connecting the two rotating rings. The two rotating rings are respectively engaged with one stationary sealing ring 91.
[0035] Sealing assembly 3 43 includes mechanical seal 1 8, which is mounted on sealing groove 3 22. The stationary sealing ring 81 of mechanical seal 1 8 is interference-fitted into sealing groove 3 22. The rotating sealing ring 82 of mechanical seal 1 8 mates with the stationary sealing ring 81, and the front end of the rotating sealing ring 82 is provided with a ring 10 to limit its axial displacement. This ring 10 is made of stainless steel, and the other end of the ring 10 abuts against an impeller (not shown in the figure). Sealing assembly 3 43 is actually limited by the impeller and the ring 10, and the ring 10 is used to space the sealing assembly 3 43 from the impeller.
[0036] In this invention, the sealing degree of the three embodiments is different, with the sealing degree of Embodiment 1, Embodiment 2, and Embodiment 3 increasing sequentially.
[0037] In summary, this invention achieves multi-level sealing by using multiple sealing groups containing different sealing elements, resulting in excellent sealing performance. Different sealing elements form sealing mechanisms with varying degrees of sealing, adapting to different sealing requirements. Furthermore, the motor front cover and oil seal cover are compatible with different sealing elements. Depending on customer needs or usage scenarios, sealing mechanisms with different degrees of sealing can be switched at will without replacing parts. This allows for mass production, reducing production costs, offering high flexibility, a wide range of applications, and improved user experience.
[0038] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0039] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A multi-stage canned pump motor characterized by: The device includes a motor front cover, an oil seal cover, and a sealing mechanism. The motor front cover is located at the front end of the motor, and the oil seal cover is located at the front end of the motor front cover. The sealing mechanism includes multiple sealing groups, each of which includes sealing group one, sealing group two, and sealing group three arranged sequentially along the motor shaft axis. Each sealing group includes at least one sealing element. The rear end of the motor front cover has a sealing groove one for installing sealing group one. Sealing group two is located between the oil seal cover and the motor front cover. The front end of the motor front cover has a sealing groove two one for installing sealing group two. The rear end of the oil seal cover has a sealing groove two two for installing sealing group two. The front end of the oil seal cover has a sealing groove three for installing sealing group three. The outer diameters of sealing groove one, sealing groove two one, sealing groove two two, and sealing groove three are the same.
2. The multi-stage canned pump motor of claim 1, wherein: The oil seal cover is sealed to the front cover of the motor. The rear end of the oil seal cover is provided with a sealing boss, the front end of the front cover of the motor is provided with a sealing groove, the front end of the sealing groove is provided with a groove, the sealing boss is inserted into the sealing groove, and the sealing boss and the groove together form a sealing groove four. A sealing ring is provided inside the sealing groove four and fitted on the outside of the sealing boss.
3. The multi-stage canned pump motor of claim 1, wherein: The sealing groove 1, sealing groove 21, sealing groove 22 and sealing groove 3 are all spaced apart.
4. The multi-stage canned pump motor of claim 3, wherein: The sealing assembly includes a skeleton oil seal, the outer side of which is interference-fitted with the sealing groove, and the inner side of which is interference-fitted with the motor shaft.
5. The multi-stage canned pump motor of claim 4, wherein: The second sealing assembly includes a skeleton oil seal and a mechanical seal that are spaced apart. The outer side of the skeleton oil seal is press-fitted to the sealing groove. The inner side of the skeleton oil seal is provided with a sealing part and a sealing part in sequence from the outside to the inside. Both the sealing part and the sealing part are press-fitted to the motor shaft. The mechanical seal is installed on the sealing groove.
6. The multi-stage canned pump motor of claim 5, wherein: The sealing part one includes a cone ring one and a cone ring two. The cone ring one decreases in size from the outside to the inside. The cone ring two is located inside the cone ring one and increases in size from the outside to the inside. The cone ring one and the cone ring two are connected to form a V-shaped structure, and the tip of the V-shape is interference-fitted with the motor shaft. The sealing part two is a cone ring three protruding from the rear end of the cone ring two. The cone ring three is connected to the cone ring two by a circular arc transition and decreases in size from the outside to the inside.
7. The multi-stage canned pump motor of claim 5, wherein: The mechanical seal includes a stationary sealing ring and a rotating sealing ring. The stationary sealing ring is interference-fitted into the sealing groove. The rotating sealing ring is fitted with the stationary sealing ring, and the rear end of the rotating sealing ring is provided with a retaining ring to limit its axial displacement.
8. The multi-stage canned pump motor of claim 4, wherein: The second sealing assembly includes a second mechanical seal, which includes a second stationary sealing ring and a second rotating sealing ring. There are two second stationary sealing rings, which are respectively interference-fitted into the first and second sealing grooves. The second rotating sealing ring includes two rotating rings and a spring connecting the two rotating rings. The two rotating rings are respectively engaged with one second stationary sealing ring.
9. A multi-stage canned pump motor according to claim 5 or 6 or 8, characterised in that: The sealing assembly three includes a skeleton oil seal two. The outer side of the skeleton oil seal two is interference-fitted with the sealing groove three. The inner side of the skeleton oil seal two is provided with a sealing part one and a sealing part two in sequence from the outside to the inside. Both the sealing part one and the sealing part two are interference-fitted with the motor shaft.
10. A multi-stage canned pump motor according to claim 5 or 6 or 8, characterised in that: The sealing group three comprises a mechanical seal one, which is installed on the sealing groove three, and the sealing static ring one of the mechanical seal one is interference-fitted in the sealing groove three, the sealing dynamic ring one of the mechanical seal one cooperates with the sealing static ring one, and the front end of the sealing dynamic ring one is provided with a circular ring limiting the axial displacement thereof.