CN212838554U - Structure is prevented leaking by closed impeller access & exit - Google Patents
Structure is prevented leaking by closed impeller access & exit Download PDFInfo
- Publication number
- CN212838554U CN212838554U CN202021054286.9U CN202021054286U CN212838554U CN 212838554 U CN212838554 U CN 212838554U CN 202021054286 U CN202021054286 U CN 202021054286U CN 212838554 U CN212838554 U CN 212838554U
- Authority
- CN
- China
- Prior art keywords
- impeller
- ring
- wear
- static wear
- pump cover
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model provides a structure is prevented leaking by closed impeller access & exit, includes impeller, pump cover, static wear ring, and the impeller includes impeller front disc subassembly, and static wear ring and impeller front disc subassembly constitute sealed friction pair, and static wear ring peripheral surface is equipped with elastic ring and integrative cover and locates the pump cover inner chamber spacing, and static wear ring's preceding terminal surface is equipped with axial clearance L and is greater than or equal to 0.5mm with pump cover inner chamber surface. The structure reduces the gap between the impeller front disc and the pump cover to zero, eliminates medium backflow from a water outlet to a water inlet through the gap, and through the arrangement of the elastic ring and the axial gap L, the static wear-resistant ring can elastically displace in the radial direction and the axial direction to generate a vibration absorption effect, so that the vibration and noise generated when the static wear-resistant ring impacts the pump cover are reduced, the installation precision requirements of the pump cover, the pump body and the impeller are reduced, and the local abrasion of a sealing friction pair is reduced.
Description
Technical Field
The utility model relates to a structure is prevented leaking by miniature canned motor pump's closed impeller access & exit, IPC classification can belong to F04D13/06 or F04D 29/00.
Background
A gap is formed between an impeller front disc and a pump cover of the conventional closed impeller pump to be communicated with an inlet and an outlet of a pump impeller, and part of high-pressure liquid at the outlet flows back to the inlet through the gap to form internal leakage, so that large volume loss in the pump is caused, and the volume efficiency of the pump is reduced. To solve this problem, chinese patent document CN110873060A discloses that an annular seal is provided between a pump casing inlet and a pump wheel inlet, the seal has a through hole communicating the pump casing inlet and the pump wheel inlet, the seal is located at a gap between the pump casing and the pump wheel to block fluid from flowing from the pump wheel outlet to the pump wheel inlet through the gap, the seal includes a friction ring mounted on the pump casing around the pump casing inlet and a spacing ring mounted on the pump wheel around the pump wheel inlet, and a sealing friction pair is formed between the friction ring and the spacing ring. The sealing piece is rigidly arranged on the pump shell, vibration and noise are easy to generate, the requirement precision on the radial offset of the pump shell and the offset of the end face of the pump shell and the pump wheel is very high, otherwise, the local sealing friction degree and the local abrasion are serious, and the service life and the sealing performance are further influenced.
Common knowledge on canned pumps is found in pump theory and technology, 2014 edition of the mechanical industry Press.
Other terms and common knowledge can be found in the mechanical engineering handbook, the motor engineering handbook, the national standard GB/T7021-86 centrifugal pump noun term, and the pump body, Chinese patent publication CN110873060A, published by the mechanical industry Press, 1983 or 1997 edition.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a miniature canned motor pump's closed impeller access & exit leak protection structure.
The utility model provides a technical scheme is: the utility model provides a structure is prevented leaking by closed impeller access & exit, includes impeller, pump cover, static wear ring, and the impeller includes impeller front disc subassembly, and static wear ring and impeller front disc subassembly constitute sealed friction pair, and static wear ring peripheral surface is equipped with elastic ring and integrative cover and locates the interior annular step in the pump cover, and static wear ring's preceding terminal surface and pump cover inner chamber surface are equipped with axial clearance L and are greater than or equal to 0.5 mm.
The sealing structure reduces the gap between the impeller front disc and the pump cover to zero, eliminates medium backflow from a water outlet to a water inlet through the gap, and can generate vibration absorption effect by elastic ring and arrangement that the dimension L of the axial gap is more than or equal to 0.5mm, and the static wear-resisting ring can elastically displace in the radial direction and the axial direction, thereby reducing vibration and noise generated by the static wear-resisting ring impacting the pump cover, reducing the installation precision requirements of the pump cover, the pump body and the impeller, and reducing the local abrasion of the sealing friction pair.
Furthermore, the outer peripheral surface of the static wear-resisting ring is provided with an outer annular step and/or a groove for sleeving the elastic ring, the installation firmness is high, and particularly, the elastic ring is sleeved by the groove more firmly.
Furthermore, the impeller front disk assembly is formed by clamping an impeller front disk with a rotary wear-resistant ring, the rotary wear-resistant ring and the end face of the static wear-resistant ring form a sealing friction pair, the rotary wear-resistant ring is made of wear-resistant plastic, and the impeller front disk main body is made of common plastic only.
Furthermore, the impeller front disc assembly is an impeller front disc formed by adopting wear-resistant plastic at one time, the end face of the impeller front disc assembly is directly attached to the end face of the static wear-resistant ring to form a sealing friction pair, and the impeller front disc assembly is simple in process structure and does not need to be provided with a clamping structure to fix the rotary wear-resistant ring because the whole impeller front disc assembly adopts the wear-resistant plastic to play the role of the rotary wear-resistant ring.
Furthermore, the impeller front disc assembly is an impeller front disc formed by wear-resistant plastic at one step and comprises an impeller inlet convex ring, the end face of the convex ring is attached to the end face of a static wear-resistant ring to form a sealing friction pair, and the impeller front disc assembly is also a priority mode of utilizing the whole wear-resistant plastic adopted by the impeller front disc to play a role of rotating the wear-resistant ring.
Furthermore, the elastic ring is preferably an O-shaped ring which is an economic and easily available standard part and can also play a role in elastic shock absorption.
The utility model also provides a miniature canned pump, including the above-mentioned closed impeller access & exit leak protection structure that is equipped with the elastic ring, this structure sets up between closed impeller and pump cover, has solved the leakage problem and the sealed vice vibration problem of friction that leaks back the impeller import in the impeller export.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Drawings
Fig. 1 is an axial sectional view of the closed impeller inlet/outlet leakage preventing structure of embodiment 1 of the present invention.
Fig. 2 is an enlarged view of a portion I of fig. 1.
Fig. 3 is a schematic view of fig. 2 with the O-ring removed.
Fig. 4 is a partially enlarged schematic view of the closed impeller inlet/outlet leakage preventing structure of embodiment 2 of the present invention.
Fig. 5 is an axial sectional view of the closed impeller inlet/outlet leakage preventing structure of embodiment 3 of the present invention.
Fig. 6 is an axial sectional view of another preferred installation example of the closed impeller inlet/outlet leakage preventing structure of embodiment 3 of the present invention.
Reference numerals:
the impeller comprises an impeller 10, an impeller main body 11, an impeller front disc 12, an impeller front disc inlet ring 12-1, an inlet ring front end face 12-13 ', an impeller front disc end face 12-13', and a rotary wear-resistant ring 13;
the pump cover 20, the annular cylindrical surface 20-1, the annular plane 20-2, the inner annular step 20-10, the inner surface 20-3, the O-shaped ring 21, the static wear-resistant ring 22, the annular cylindrical surface 22-1, the annular plane 22-2, the outer annular step 22-10, the front end surface 22-3 and the groove 22-4.
Detailed Description
The utility model discloses structure is prevented leaking by closed impeller access & exit is at similar CN110873060A, CN2150371Y improve on the basis of prior art product and form. The improvement key points are as follows: the shape, material and fixing structure of the sealing friction pair.
Example 1
The anti-leakage structure of the impeller inlet and outlet of the miniature canned pump in the embodiment is shown in fig. 1-3, and comprises a closed impeller 10, a pump cover 20, an O-ring 21 and a static wear-resistant ring 22, wherein the impeller 10 comprises an impeller main body 11, an impeller front disc 12 and a rotary wear-resistant ring 13.
The inner surface of the pump cover 20 is provided with an inner annular step 20-10 formed by an annular cylindrical surface 20-1 and an annular plane 20-2 which are mutually adjacent, the outer surface of the static wear-resistant ring 22 is provided with an outer annular step 22-10 formed by an annular cylindrical surface 22-1 and an annular plane 22-2 which are mutually adjacent, the two annular steps are oppositely arranged to form an annular space for accommodating an O-shaped ring 21, the O-shaped ring 21 is sleeved on the outer annular step 22-10 of the static wear-resistant ring 22 to form an assembly, the assembly is sleeved in the inner annular step 20-10 of the pump cover 20, the two annular steps moderately clamp the O-shaped ring 21, the inner surface 20-3 of the pump cover 20 and the front end surface 22-3 of the static wear-resistant ring 22 are oppositely arranged in a clearance mode, the clearance value L is preferably 0.5 mm-2.0 mm and is slightly larger than the axial momentum of the O-shaped ring during extrusion deformation, and, the vibration and noise caused by the impact of the static wear-resisting ring on the pump cover are avoided. The rotary wear-resistant ring 13 is made of graphite or ceramic materials, the impeller 10 is formed by ultrasonic welding of a semi-open impeller main body 11 and an impeller front disc 12 which are respectively formed by injection molding, a circular inlet ring 12-1 protrudes from an inlet along the axial direction, and a clamping hook is arranged on the front end face of the impeller front disc 12 to fix the rotary wear-resistant ring 13.
In other embodiments, the O-ring may be replaced by an elastic ring, and may provide appropriate elasticity to achieve the vibration absorption effect, the blades on the impeller body 11 may be integrally injection-molded with the impeller front disk 12, and the rotary wear-resistant ring 13 may be integrally injection-molded with the impeller front disk 12 as an insert, or may be welded, bonded, riveted, or screwed to be fixed to the impeller front disk.
The wear-resisting ring 13 rotating with the impeller 10 is fixedly connected to the impeller front disc 12, the static wear-resisting ring 22 is sleeved in the inner annular step 20-10 of the pump cover 20 through the O-shaped ring 21, the two ring-shaped steps form a sealing friction pair (13,22), the resultant force of the axial force borne by the impeller 10 faces the pump cover 20 through proper design, the end faces of the two wear-resisting rings (13,22) are attached to realize end face friction sealing, the gap between the impeller front disc and the pump cover is reduced to zero, medium backflow from a water outlet to a water inlet through the gap is eliminated, vibration and noise generated by impeller impact are reduced through the vibration absorption effect of the O-shaped ring, the installation precision requirements of the pump cover, the pump body and the impeller are reduced, and the local abrasion of the sealing friction pair is reduced.
For the design principle of controlling the axial force, refer to pump theory and technology and textbooks of pump and blower 2008 of electric power press of China.
Example 2: as shown in figure 4, an annular groove 22-4 is formed in the position of the outer cylindrical surface 22-1 of the static wear-resisting ring, the O-shaped ring 21 is sleeved in the annular groove 22-4 of the static wear-resisting ring 22, and the installation firmness is high.
Example 3:
as shown in figure 5, the impeller front disc 12 is formed by one-time injection molding of wear-resistant materials, a convex ring 12-1 is formed at the inlet of the impeller front disc, the end surface 12-13 'of the convex ring is directly attached to a static wear-resistant ring 22 to form a sealing friction pair (12-13', 22), the end surface of the impeller front disc plays a role of a rotary wear-resistant ring, the process structure is simple, and a clamping structure is not required to be arranged to clamp the rotary wear-resistant ring which is additionally manufactured.
As shown in fig. 6, in another preferred case, the end face 12-13 ″ of the impeller front disk inlet convex ring 12-1 is directly attached to the end face of the static wear-resistant ring 22 to form a sealed friction pair, and the outer peripheral surface of the convex ring is in clearance fit with the inner hole surface of the static wear-resistant ring (22), and the clearance is not less than 0.1, so that the two surfaces are prevented from touching to increase the radial force of the rotor bearing.
Claims (6)
1. The utility model provides a structure is prevented leaking by closed impeller access & exit, includes impeller (10), pump cover (20), static wear ring (22), and impeller (10) are including impeller front disk subassembly, and static wear ring (22) and impeller front disk subassembly constitute sealed friction pair, its characterized in that: the outer peripheral surface of the static wear-resistant ring (22) is provided with an elastic ring and is integrally sleeved with an inner annular step (20-10) in the pump cover (20), and the front end surface (22-3) of the static wear-resistant ring (22) and the inner cavity surface (20-3) of the pump cover (20) are provided with an axial clearance L which is more than or equal to 0.5 mm.
2. The shrouded impeller port leak-proof structure according to claim 1, wherein: an outer annular step (22-10) and/or a groove (22-4) for sleeving the elastic ring are/is formed on the outer peripheral surface of the static wear-resisting ring (22).
3. The shrouded impeller port leak-proof structure according to claim 1, wherein: the impeller front disk assembly is formed by clamping a rotary wear-resisting ring (13) on an impeller front disk (12), and the rotary wear-resisting ring (13) and the end face of a static wear-resisting ring (22) form a sealing friction pair.
4. The shrouded impeller port leak-proof structure according to claim 1, wherein: the impeller front disk assembly is an impeller front disk (12) formed by wear-resistant plastic at one step, and the end surface (12-13') of the impeller front disk assembly is directly attached to the end surface of the static wear-resistant ring (22) to form a sealing friction pair.
5. The shrouded impeller port leak-proof structure according to claim 1, wherein: the impeller front disk assembly is an impeller front disk (12) formed by wear-resistant plastic at one step and comprises an impeller inlet convex ring (12-1), and the end surface (12-13') of the convex ring is attached to the end surface of a static wear-resistant ring (22) to form a sealing friction pair.
6. The shrouded impeller port leak-proof structure according to claim 1, wherein: the elastic ring adopts an O-shaped ring (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021054286.9U CN212838554U (en) | 2020-06-09 | 2020-06-09 | Structure is prevented leaking by closed impeller access & exit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021054286.9U CN212838554U (en) | 2020-06-09 | 2020-06-09 | Structure is prevented leaking by closed impeller access & exit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212838554U true CN212838554U (en) | 2021-03-30 |
Family
ID=75171473
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021054286.9U Active CN212838554U (en) | 2020-06-09 | 2020-06-09 | Structure is prevented leaking by closed impeller access & exit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212838554U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117386658A (en) * | 2023-11-04 | 2024-01-12 | 武安市宏泰机械泵业有限公司 | Centrifugal hot oil pump with leak protection oil function |
-
2020
- 2020-06-09 CN CN202021054286.9U patent/CN212838554U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117386658A (en) * | 2023-11-04 | 2024-01-12 | 武安市宏泰机械泵业有限公司 | Centrifugal hot oil pump with leak protection oil function |
| CN117386658B (en) * | 2023-11-04 | 2024-02-27 | 武安市宏泰机械泵业有限公司 | Centrifugal hot oil pump with leak protection oil function |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114233640B (en) | High-efficient radiating double fluid passage water pump | |
| EP2800904A1 (en) | Rotodynamic pump with permanent magnet coupling inside the impeller | |
| CN212838554U (en) | Structure is prevented leaking by closed impeller access & exit | |
| CN212003608U (en) | Small-flow high-lift multistage centrifugal pump | |
| CN111677695A (en) | Self-radiating electronic cooling water pump | |
| CN202370891U (en) | Cooling water pump of engine | |
| CN207994778U (en) | A kind of motor | |
| CN110985404B (en) | Magnetic suspension fluid micropump with straight-through inner flow channel | |
| CN114483593A (en) | Self-balancing multistage split pump equipment | |
| CN210033860U (en) | Hollow cup rotor water pump and new energy automobile | |
| CN220415790U (en) | Water pump feed liquor structure and water pump | |
| CN207701453U (en) | A kind of pump with combined impeller | |
| CN211474514U (en) | Impeller structure with enhanced blades on front cover of impeller | |
| CN205331244U (en) | Novel canned motor thrust bearing foundation subassembly | |
| CN209748360U (en) | cooling structure of motor rotor | |
| CN216518836U (en) | Water-cooling permanent magnet shielding pump water outlet structure | |
| CN215927891U (en) | Axial force balance mechanism and submerged centrifugal pump using same | |
| CN212130872U (en) | Closed impeller suction inlet ring sealing structure and micro shielding pump using same | |
| CN220646303U (en) | Pump with a pump body | |
| CN219549189U (en) | Floating sealing ring structure of split double suction pump | |
| CN213981318U (en) | Mechanical sealing device of nuclear power condensate pump | |
| CN211715418U (en) | Automatic centering buffer device of centrifugal pump | |
| CN216477892U (en) | Canned motor pump | |
| CN220081738U (en) | Impeller and pump housing sealing assembly and pump unit with same | |
| CN212744140U (en) | Double-impeller automobile electronic cooling water pump |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |