CN215672851U - Water outlet section throttling sealing structure of self-balancing multistage centrifugal pump - Google Patents
Water outlet section throttling sealing structure of self-balancing multistage centrifugal pump Download PDFInfo
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- CN215672851U CN215672851U CN202122259733.5U CN202122259733U CN215672851U CN 215672851 U CN215672851 U CN 215672851U CN 202122259733 U CN202122259733 U CN 202122259733U CN 215672851 U CN215672851 U CN 215672851U
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Abstract
The utility model discloses a water outlet section throttling sealing structure of a self-balancing multistage centrifugal pump, a last-stage positive guide vane (6) and a last-stage reverse guide vane (8) are respectively and fixedly arranged at the left side and the right side of a water outlet section (7) through a positioning pin (5), an L-shaped stepped throttling bush (13) is fixed at an inner hole of the water outlet section (7) through a flat head screw, a throttling shaft sleeve (12) is arranged between a pump shaft (1) and the L-shaped stepped throttling bush (13), an L-shaped last-stage positive opening ring (3) and an L-shaped last-stage reverse opening ring (9) are respectively fixed at inner holes of the last-stage positive guide vane (6) and the last-stage reverse guide vane (8) through a screw (4), a last-stage positive impeller (2) and a last-stage reverse impeller (10) are respectively arranged in inner cavities of the last-stage positive guide vane (6) and the last-stage reverse guide vane (8), the positioning chuck (14) is arranged between the throttling shaft sleeve (12) and the final-stage counter impeller (10). This structure can improve the interstage sealing performance of the pump and suppress leakage.
Description
Technical Field
The utility model relates to the technical field of self-balancing multistage centrifugal pumps, in particular to the technical field of shaft seals of self-balancing multistage centrifugal pumps, and particularly relates to a water outlet section throttling sealing structure of a self-balancing multistage centrifugal pump.
Background
The self-balancing multistage centrifugal pump mainly comprises a water inlet section, a middle section, a water outlet section, a secondary water inlet section, a positive guide vane, a negative guide vane, a positive impeller, a negative impeller, a pump shaft, a throttling part, a retaining sleeve, a transition pipe, a bearing body and other parts. In the operation process of the self-balancing multistage centrifugal pump, the pump shaft rotates under the driving of the motor to apply work to the conveyed fluid, so that the energy of the conveyed fluid is increased, and the required amount of fluid is continuously sent out from the suction pool through the water inlet section of the pump, the horizontal water outlets of the positive impeller, the positive guide vane, the middle section and the water outlet section, the transition pipe, the secondary water inlet section, the reverse impeller, the reverse guide vane and the vertical water outlets of the water outlet section.
The impeller of the self-balancing multistage centrifugal pump is arranged symmetrically, namely the impellers of the multistage centrifugal pump are arranged on the pump shaft in a back-to-back manner, so that a low-pressure cavity and a high-pressure cavity are respectively arranged at two sides of a water outlet section of the self-balancing multistage centrifugal pump, the water outlet section usually adopts a throttling support structure with a middle throttling shaft sleeve and a middle throttling bush matched with each other, the structure is used for preventing fluid in the high-pressure cavity from flowing into the low-pressure cavity, the throttling sealing effect is achieved, and meanwhile, the stable fluid pressure of the high-pressure cavity and the low-pressure cavity at two sides of the water outlet section is maintained. At present, the water outlet section of the self-balancing multistage centrifugal pump mostly adopts a throttling support structure which is conventionally configured, and due to larger fluid pressure difference between a high-pressure cavity and a low-pressure cavity, a high-speed and high-pressure jet effect is formed when a fluid medium flows through an axial gap between a middle throttling shaft sleeve and a middle throttling bush, so that the flash evaporation phenomenon of the fluid medium is easily formed, the running condition of the self-balancing multistage centrifugal pump is rapidly worsened, and the vibration and the running instability of a unit are easily caused.
In the utility model, a first sealing ring is connected between one side of a water outlet section and a final-stage positive impeller, a second sealing ring is connected between the other side of the water outlet section and a final-stage counter impeller, and a third sealing ring is connected between the water outlet section and a middle throttling sleeve in the composite sealing structure of the self-balancing multi-stage pump water outlet section (application number: 202021132760.5). The utility model discloses a self-balancing multistage pump throttle alloy cover (application number: 202021109967.0) sets up the alloy inner liner in the pump shaft outer lane, and alloy inner liner outer lane sets up the alloy overcoat, and both sides set up left throttle cover packing ring and right throttle cover packing ring around the alloy endotheca, and this throttle alloy cover has only innovated through the middle throttle bearing structure to self-balancing multistage centrifugal pump, and the fluid medium pressure in the high-pressure chamber of play water leg both sides and low-pressure chamber does not change for high-speed, highly compressed jet effect and flash distillation phenomenon are not effectively solved in the seal gap. The utility model discloses a throttle cover component of "a self-balancing multistage pump of high-efficient throttle" (application number: 202021108820. X) is the throttle axle sleeve, and throttle axle sleeve right side is fixed with the alloy cover, and the alloy cover inboard sets up the alloy endotheca, and the alloy endotheca inboard sets up the inside lining, and the alloy cover right side sets up the throttle bush, and the throttle bush passes through the bolt fastening on the shell and with the laminating of alloy overcoat, and this throttle cover component structure is more complicated, has increased the degree of difficulty of the production and processing and the assembly of water outlet section internal throttling bearing structure.
In view of this, in order to reduce the fluid medium pressure in the high-pressure chamber and the low-pressure chamber on both sides of the water outlet section of the self-balancing multistage centrifugal pump and reduce the pressure difference on both sides of the throttling support structure of the water outlet section and the volume loss of the whole pump unit, a throttling seal structure suitable for the water outlet section of the self-balancing multistage centrifugal pump is needed.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects and aims to provide a water outlet section throttling sealing structure of a self-balancing multistage centrifugal pump, which improves the interstage sealing capability of the self-balancing multistage centrifugal pump and inhibits interstage leakage of fluid media conveyed at two sides of a water outlet section by a composite sealing form of axial sealing of a front-stage impeller rear cover plate and a reverse-stage impeller rear cover plate and a stepped intermediate throttling supporting structure.
In order to achieve the purpose, the technical scheme adopted by the utility model is as follows: a water outlet section throttling sealing structure of a self-balancing multistage centrifugal pump comprises a pump shaft, a last-stage positive impeller, an L-shaped last-stage positive mouth ring, a last-stage positive guide vane, a positioning pin, a water outlet section, a throttling shaft sleeve, an L-shaped stepped throttling bush, a last-stage reverse impeller, an L-shaped last-stage reverse mouth ring, a last-stage reverse guide vane, a screw and a positioning chuck, wherein the last-stage positive guide vane and the last-stage reverse guide vane are fixedly arranged at the left side and the right side of the water outlet section respectively through the positioning pin, the L-shaped stepped throttling bush is fixed at an inner hole of the water outlet section through a flat head screw, the throttling shaft sleeve is arranged between the pump shaft and the L-shaped stepped throttling bush, the L-shaped last-stage positive mouth ring is fixed at the inner hole of the last-stage positive guide vane through the screw, the last-stage positive impeller is arranged in the inner cavity of the last-stage positive guide vane, the last-stage reverse impeller is arranged in the inner cavity of the last-stage reverse guide vane, the positioning chuck is arranged between the throttling shaft sleeve and the last-stage counter impeller, and the pump shaft sequentially penetrates through inner holes of the last-stage positive impeller, the throttling shaft sleeve, the positioning chuck and the last-stage counter impeller.
The rear cover plate of the final-stage positive impeller is provided with a circular boss structure, and the maximum outer circle diameter of the circular boss is slightly smaller than the inner circle diameter of the L-shaped final-stage positive opening ring.
The rear cover plate of the last-stage counter impeller is provided with a circular boss structure, and the maximum outer circle diameter of the circular boss is slightly smaller than the inner circle diameter of the L-shaped last-stage counter ring.
The diameters of inner holes of the L-shaped stepped throttling bushings are different, and the diameter of the inner hole of the L-shaped stepped throttling bushing close to the last-stage positive impeller is smaller than that of the L-shaped stepped throttling bushing close to the last-stage reverse impeller.
The positioning chuck is fixed in a clamping groove of the pump shaft, and two sides of the positioning chuck are respectively contacted with the throttling shaft sleeve and the final-stage counter impeller.
The water outlet section throttling sealing structure of the self-balancing multistage centrifugal pump adopts the circular boss structure of the rear cover plate of the final-stage positive impeller to be matched with the final-stage positive port ring to form an axial annular dynamic sealing structure, so that high-speed and high-pressure fluid media generated at the outlet of the final-stage positive impeller cannot enter the left side of the L-shaped stepped throttling bush, and meanwhile, the final-stage reverse impeller also adopts the structure, so that high-speed and high-pressure fluid media generated at the outlet of the final-stage reverse impeller cannot enter the right side of the L-shaped stepped throttling bush, the pressure difference at two sides of the L-shaped stepped throttling bush is reduced, the interstage leakage at two sides of the water outlet section is reduced, and the efficiency of the whole pump unit is improved; an axial annular dynamic sealing structure is formed by adopting a matching structure of the L-shaped stepped throttling bush and the throttling shaft sleeve, so that a fluid medium in a high-pressure cavity of a water outlet section firstly enters a large gap formed by the L-shaped stepped throttling bush and the throttling shaft sleeve and then enters a small gap formed by the L-shaped stepped throttling bush and the throttling shaft sleeve, the fluid medium in the gap is subjected to pressure reduction step by step, the sealing exciting force of the fluid in the gap is reduced, and the phenomenon of flash evaporation of the fluid in the gap is avoided; the positioning chuck is fixed in the clamping groove of the pump shaft, so that positioning limitation on all forward impellers and all reverse impellers of the self-balancing multistage pump is realized, and the running stability of the whole machine is improved.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Labeled as: 1: a pump shaft; 2: a final stage positive impeller; 3: l-shaped final-stage orifice ring; 4: a screw; 5: positioning pins; 6: a final stage positive guide vane; 7: a water outlet section; 8: a last stage back guide vane; 9: l-shaped final-stage reverse-mouth ring; 10: a final stage counter-impeller; 11: a circular boss; 12: a throttle bushing; 13: an L-shaped stepped throttling bush; 14: and positioning the chuck.
Detailed Description
One embodiment of the present invention is further described below with reference to FIG. 1:
the water outlet section throttling sealing structure of the self-balancing multistage centrifugal pump comprises a pump shaft 1, a last-stage positive impeller 2, an L-shaped last-stage positive mouth ring 3, a last-stage positive guide vane 6, a positioning pin 5, a water outlet section 7, a throttling shaft sleeve 12, an L-shaped stepped throttling bush 13, a last-stage reverse impeller 10, an L-shaped last-stage reverse mouth ring 9, a last-stage reverse guide vane 8, a screw 4 and a positioning chuck 14, wherein the last-stage positive guide vane 6 and the last-stage reverse guide vane 8 are fixedly arranged at the left side and the right side of the water outlet section 7 respectively through the positioning pin 5, the L-shaped stepped throttling bush 13 is fixed at an inner hole of the water outlet section 7 through a flat head screw, the throttling shaft sleeve 12 is arranged between the pump shaft 1 and the L-shaped stepped throttling bush 13, the L-shaped last-stage positive mouth ring 3 is fixed at the inner hole of the last-stage positive guide vane 6 through the screw 4, the L-shaped last-stage reverse mouth ring 9 is fixed at the inner hole of the reverse guide vane 8 through the screw 4, the positive vane 2 is arranged in the inner cavity of the last-stage positive guide vane 6, the last-stage counter-impeller 10 is arranged in the inner cavity of the last-stage counter-vane 8, the positioning chuck 14 is arranged between the throttling shaft sleeve 12 and the last-stage counter-impeller 10, and the pump shaft 1 sequentially penetrates through inner holes of the last-stage positive impeller 2, the throttling shaft sleeve 12, the positioning chuck 14 and the last-stage counter-impeller 10.
The rear cover plate of the final-stage positive impeller 2 is provided with a circular boss 11 structure, and the maximum outer circle diameter of the circular boss 11 is slightly smaller than the inner circle diameter of the L-shaped final-stage positive ring 3.
The rear cover plate of the final-stage counter impeller 10 is provided with a circular boss 11 structure, and the maximum outer circle diameter of the circular boss 11 is slightly smaller than the inner circle diameter of the L-shaped final-stage counter ring 9.
The inner hole diameters of the L-shaped stepped throttling bush 13 are different, and the inner hole diameter of the L-shaped stepped throttling bush 13 close to the last-stage positive impeller 2 is smaller than the inner hole diameter of the L-shaped stepped throttling bush 13 close to the last-stage negative impeller 10.
The positioning chuck 14 is fixed in a clamping groove of the pump shaft 1, and two sides of the positioning chuck 14 are respectively contacted with the throttling shaft sleeve 12 and the final-stage counter impeller 10.
The water outlet section throttling sealing structure of the self-balancing multistage centrifugal pump adopts a circular boss 11 structure of a rear cover plate of a final-stage positive impeller 2 to be matched with a final-stage positive opening ring 3 to form an axial annular dynamic sealing structure, so that high-speed and high-pressure fluid media generated at an outlet of the final-stage positive impeller 2 cannot enter the left side of an L-shaped stepped throttling bush 13, and meanwhile, the final-stage counter impeller 10 also adopts the structure, so that high-speed and high-pressure fluid media generated at an outlet of the final-stage counter impeller 10 cannot enter the right side of the L-shaped stepped throttling bush 13, the pressure difference between two sides of the L-shaped stepped throttling bush 13 is reduced, the interstage leakage of two sides of a water outlet section 7 is reduced, and the efficiency of the whole pump unit is improved; an axial annular dynamic sealing structure is formed by adopting a matching structure of an L-shaped stepped throttling bush 13 and a throttling shaft sleeve 12, so that a fluid medium in a high-pressure cavity of a water outlet section 7 firstly enters a large gap formed by the L-shaped stepped throttling bush 13 and the throttling shaft sleeve 12 and then enters a small gap formed by the L-shaped stepped throttling bush 13 and the throttling shaft sleeve 12, the fluid medium in the gap is subjected to pressure reduction treatment step by step, the sealing exciting force of fluid in the gap is reduced, and the phenomenon of fluid flash evaporation in the gap is avoided; the positioning chuck 14 is fixed in the clamping groove of the pump shaft 1, so that positioning limitation on all forward impellers and all reverse impellers of the self-balancing multistage pump is realized, and the running stability of the whole machine is improved.
Claims (5)
1. The water outlet section throttling sealing structure of the self-balancing multistage centrifugal pump comprises a pump shaft (1), a final-stage positive impeller (2), an L-shaped final-stage positive opening ring (3), a final-stage positive guide vane (6), a positioning pin (5), a water outlet section (7), a throttling shaft sleeve (12), an L-shaped stepped throttling bush (13), a final-stage reverse impeller (10), an L-shaped final-stage reverse opening ring (9), a final-stage reverse guide vane (8), a screw (4) and a positioning chuck (14), and is characterized in that: a final-stage positive guide vane (6) and a final-stage reverse guide vane (8) are respectively and fixedly arranged at the left side and the right side of the water outlet section (7) through a positioning pin (5), an L-shaped stepped throttling bush (13) is fixed at the inner hole of the water outlet section (7) through a flat head screw, a throttling shaft sleeve (12) is arranged between a pump shaft (1) and the L-shaped stepped throttling bush (13), an L-shaped final-stage positive opening ring (3) is fixed at the inner hole of the final-stage positive guide vane (6) through a screw (4), an L-shaped final-stage reverse opening ring (9) is fixed at the inner hole of the final-stage reverse guide vane (8) through a screw (4), a final-stage positive impeller (2) is arranged in the inner cavity of the final-stage positive guide vane (6), a final-stage reverse impeller (10) is arranged in the inner cavity of the final-stage reverse guide vane (8), a positioning chuck (14) is arranged between the throttling bush (12) and the reverse impeller (10), and the pump shaft (1) sequentially penetrates through the final-stage positive impeller (2), The inner holes of the throttle bushing (12), the positioning chuck (14) and the final-stage counter impeller (10).
2. The water outlet section throttling sealing structure of the self-balancing multistage centrifugal pump according to claim 1, characterized in that: the rear cover plate of the final-stage positive impeller (2) is provided with a circular boss (11) structure, and the maximum outer circle diameter of the circular boss (11) is slightly smaller than the inner circle diameter of the L-shaped final-stage positive opening ring (3).
3. The water outlet section throttling sealing structure of the self-balancing multistage centrifugal pump according to claim 1, characterized in that: a circular boss (11) structure is arranged at the rear cover plate of the final-stage counter impeller (10), and the maximum outer circle diameter of the circular boss (11) is slightly smaller than the inner circle diameter of the L-shaped final-stage counter ring (9).
4. The water outlet section throttling sealing structure of the self-balancing multistage centrifugal pump according to claim 1, characterized in that: the diameters of inner holes of the L-shaped stepped throttling bushings (13) are different, and the diameter of the inner hole of the L-shaped stepped throttling bushing (13) close to the final-stage positive impeller (2) is smaller than that of the inner hole of the L-shaped stepped throttling bushing (13) close to the final-stage reverse impeller (10).
5. The water outlet section throttling sealing structure of the self-balancing multistage centrifugal pump according to claim 1, characterized in that: the positioning chuck (14) is fixed in a clamping groove of the pump shaft (1), and two sides of the positioning chuck (14) are respectively contacted with the throttling shaft sleeve (12) and the final-stage counter impeller (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122259733.5U CN215672851U (en) | 2021-09-17 | 2021-09-17 | Water outlet section throttling sealing structure of self-balancing multistage centrifugal pump |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122259733.5U CN215672851U (en) | 2021-09-17 | 2021-09-17 | Water outlet section throttling sealing structure of self-balancing multistage centrifugal pump |
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| CN215672851U true CN215672851U (en) | 2022-01-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114704467A (en) * | 2022-04-06 | 2022-07-05 | 河南郑泵科技有限公司 | High-lift large-flow self-balancing multistage centrifugal pump suitable for complex water quality environment |
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2021
- 2021-09-17 CN CN202122259733.5U patent/CN215672851U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114704467A (en) * | 2022-04-06 | 2022-07-05 | 河南郑泵科技有限公司 | High-lift large-flow self-balancing multistage centrifugal pump suitable for complex water quality environment |
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