CN215566829U - Stepped spiral groove annular dynamic sealing structure of water outlet section of self-balancing multi-stage pump - Google Patents
Stepped spiral groove annular dynamic sealing structure of water outlet section of self-balancing multi-stage pump Download PDFInfo
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- CN215566829U CN215566829U CN202120978539.XU CN202120978539U CN215566829U CN 215566829 U CN215566829 U CN 215566829U CN 202120978539 U CN202120978539 U CN 202120978539U CN 215566829 U CN215566829 U CN 215566829U
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Abstract
The utility model discloses a stepped spiral groove annular dynamic sealing structure of a self-balancing multi-stage pump water outlet section, which comprises a pump shaft (4), a last-stage positive impeller (3), a last-stage positive guide vane (2), a last-stage reverse impeller (6), a last-stage reverse guide vane (5), a water outlet section (1) and a stepped spiral groove annular dynamic seal, wherein the last-stage positive guide vane (3) is installed and fixed on the left side of the water outlet section (1), the last-stage reverse guide vane (5) is installed and fixed on the right side of the water outlet section (1), the stepped spiral groove annular dynamic seal is installed at the central hole of the water outlet section (1) through a fixing screw, the last-stage positive impeller (3) and the last-stage reverse impeller (6) are installed on the pump shaft (4) in a back-to-back manner through a flat key, the last-stage positive impeller (3) is installed in the inner cavity of the last-stage positive guide vane (2), and the last-stage reverse impeller (6) is installed in the inner cavity of the last-stage reverse guide vane (5). The structure can improve the interstage sealing capability of the self-balancing multistage centrifugal pump, and is simple in structure and convenient to install.
Description
Technical Field
The utility model relates to the technical field of self-balancing multistage centrifugal pumps, in particular to the technical field of interstage sealing of self-balancing multistage centrifugal pumps, and particularly relates to a stepped spiral groove annular dynamic sealing structure of a water outlet section of a self-balancing multistage 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 is driven by the motor to rotate to do work on 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, the positive impeller, the positive guide vane, the horizontal water outlet of the middle section and the water outlet section of the pump, the transition pipe, the secondary water inlet section, the reverse impeller, the reverse guide vane and the vertical water outlet 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 the water outlet section of the self-balancing multistage centrifugal pump mainly comprises a low-pressure cavity and a high-pressure cavity, and a large pressure difference exists between the high-pressure cavity and the low-pressure cavity, so that fluid on the side of the high-pressure cavity leaks to the side of the low-pressure cavity along an interstage seal gap, as a result, the pressure at the rear cover plate of the last-stage impeller on the low-pressure side is increased, and an additional axial force pointing to the suction side is generated. In addition, because of the bigger pressure difference between the low-pressure cavity and the high-pressure cavity of the water outlet section, the leakage of the conveyed fluid medium is easy to cause, the volume loss of the whole pump unit is increased, and the whole efficiency is reduced.
In the patent of a self-balancing multi-stage pump water outlet section composite sealing structure (application number is 202021132760.5), a middle throttle shaft sleeve is arranged between a last-stage positive impeller and a last-stage negative impeller, a middle throttle sleeve is sleeved on the periphery of the middle throttle shaft sleeve, a water outlet section is sleeved on the periphery of the middle throttle sleeve, and a throttle ring is sleeved on the water outlet section; the throttling ring is arranged between the last-stage positive impeller and the last-stage negative impeller, a first sealing ring is connected between one side of the water outlet section and the last-stage positive impeller, a second sealing ring is connected between the other side of the water outlet section and the last-stage negative impeller, and a third sealing ring is connected between the water outlet section and the middle throttling sleeve, so that a composite sealing device structure combining multiple radial seals and multiple axial seals is formed. The sealing rings are arranged on the rear cover plates of the last-stage positive impeller and the last-stage reverse impeller, so that the production and processing difficulty of the last-stage positive impeller and the last-stage reverse impeller is increased, and the installation and assembly difficulty of the self-balancing multi-stage pump water outlet section is increased.
In view of this, in order to increase the interstage sealing capability between the low-pressure cavity and the high-pressure cavity of the water outlet section of the self-balancing multistage pump, reduce the volume loss, reduce the additional axial force of the whole pump unit, and simultaneously, on the premise of not increasing the production and processing difficulty of the final-stage positive impeller, the final-stage counter impeller and the water outlet section, an interstage sealing structure suitable for the water outlet section of the self-balancing multistage centrifugal pump is urgently needed.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects and aims to provide a stepped spiral groove annular dynamic sealing structure of a water outlet section of a self-balancing multistage pump, and provides a composite sealing structure of the stepped spiral groove annular dynamic sealing structure and a pressure relief opening of the water outlet section, so that the interstage sealing capability of the self-balancing multistage centrifugal pump is improved, and interstage leakage of fluid media conveyed on two sides of the water outlet section is inhibited.
In order to achieve the purpose, the technical scheme adopted by the utility model is as follows: the utility model provides a cascaded helicla flute annular dynamic seal structure of self-balancing multistage pump water discharge section, including the pump shaft, last stage positive impeller, last stage positive stator, last stage negative impeller, last stage negative stator, go out water section and cascaded helicla flute annular dynamic seal, wherein the installation of last stage positive stator is fixed in the left side of going out the water section, last stage negative stator installation is fixed in the right side of going out the water section, cascaded helicla flute annular dynamic seal passes through set screw and installs in the centre bore department of going out the water section, last stage positive impeller and last stage negative impeller pass through the parallel key with back to back the form and install on the pump shaft, last stage positive impeller is installed in the inner chamber of last stage positive stator, last stage negative impeller is installed in the inner chamber of last stage negative stator.
The stepped spiral groove annular dynamic seal comprises a stator spiral groove and a rotor spiral groove, wherein the stator spiral groove consists of a spiral groove hole and a straight-through hole, the diameter of the straight-through hole is 1.1 times of that of the spiral groove hole, the wall surface of an inner cavity of the straight-through hole is not provided with a spiral groove, the wall surface of the inner cavity of the spiral groove hole is provided with a spiral groove, the straight-through hole is arranged at the position, close to a last-stage reverse impeller, of the stator spiral groove, the spiral groove hole is arranged at the position, close to a last-stage positive impeller, of the stator spiral groove, the excircle diameter of the rotor spiral groove is equal, the excircle wall surface of the rotor spiral groove is provided with a spiral groove, the rotor spiral groove is fixedly installed on a pump shaft, and the stator spiral groove is fixedly installed on a water outlet section.
The spiral groove is a rectangular spiral groove, and the pitch and lead of the spiral groove are equal to the number of spiral heads, but the spiral direction of the spiral groove is opposite.
The inner cavity of the water outlet section is provided with a pressure relief cavity, a pressure relief hole A is formed in the position, close to the wall surface of the rear cover plate of the final-stage positive impeller, of the pressure relief cavity, and a pressure relief hole B is formed in the position, close to the wall surface of the final-stage positive guide vane, of the pressure relief cavity.
In the operation process of the self-balancing multistage centrifugal pump, the position of the annular dynamic seal of the stepped spiral groove, which is close to the rear cover plate of the last-stage counter impeller, is a high-pressure cavity, the position of the annular dynamic seal of the stepped spiral groove, which is close to the rear cover plate of the last-stage positive impeller, is a low-pressure cavity, under the action of pressure difference between the two sides of the low-pressure cavity and the high-pressure cavity, a fluid medium firstly enters an annular cavity formed between a through hole of the stator spiral groove and the rotor spiral groove, the speed and the pressure of the fluid medium are reduced, and then the fluid medium flows along an annular gap between the spiral groove hole of the stator spiral groove and the rotor spiral groove under the action of pressure difference between the two sides of the low-pressure cavity and the high-pressure cavity, and the fluid medium between the spiral groove of the stator and the rotor spiral groove is subjected to violent stirring action because the rotor spiral groove is installed and fixed on the pump shaft and rotates together with the pump shaft, so that the speed and pressure are further reduced, and the purpose of reducing leakage is achieved. In addition, a pressure relief cavity is arranged in an inner cavity of the water outlet section, a pressure relief hole A is formed in the position, close to the wall surface of the rear cover plate of the last-stage positive impeller, of the pressure relief cavity, a pressure relief hole B is formed in the position, close to the wall surface of the last-stage positive guide vane, of the pressure relief cavity, fluid at the position of the rear cover plate of the last-stage positive impeller can flow to an outlet of the last-stage positive guide vane sequentially through the pressure relief hole A, the pressure relief cavity and the pressure relief hole B, the pressure at the position of the rear cover plate of the last-stage positive impeller is further reduced, and the additional axial force of the whole pump unit is reduced.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic structural diagram of the stepped spiral groove annular dynamic seal of the utility model.
Labeled as: 1: a water outlet section; 2: a final stage positive guide vane; 3: a final stage positive impeller; 4: a pump shaft; 5: a last stage back guide vane; 6: a final stage counter-impeller; 7: a stator helical groove; 8: a rotor helical groove; 9: a pressure relief hole A; 10: a pressure relief hole B; 11: a helical slot; 12: and (4) a through hole.
Detailed Description
An embodiment of the present invention is further described below with reference to fig. 1 and 2:
a cascaded helicla flute annular dynamic seal structure of self-balancing multistage pump outlet section, including pump shaft 4, last stage positive impeller 3, the positive stator 2 of last stage, last stage anti-impeller 6, last stage anti-stator 5, go out water section 1 and cascaded helicla flute annular dynamic seal, wherein the installation of the positive stator 3 of last stage is fixed in the left side of going out water section 1, the installation of last stage anti-stator 5 is fixed in the right side of going out water section 1, cascaded helicla flute annular dynamic seal passes through set screw and installs in the centre bore department of going out water section 1, last stage positive impeller 3 and last stage anti-impeller 6 pass through the parallel key with back to back the form and install on pump shaft 4, the inner chamber in the positive stator 2 of last stage is installed to last stage positive impeller 3, last stage anti-impeller 6 is installed in the inner chamber of last stage anti-stator 5.
The stepped spiral groove annular dynamic seal comprises a stator spiral groove 7 and a rotor spiral groove 8, wherein the stator spiral groove 7 consists of a spiral groove hole 11 and a straight-through hole 12, the diameter of the straight-through hole 12 is 1.1 times of that of the spiral groove hole 11, no spiral groove is formed in the wall surface of an inner cavity of the straight-through hole 12, the spiral groove is formed in the wall surface of the inner cavity of the spiral groove hole 11, the straight-through hole 12 is formed in the position, close to a last-stage counter impeller 6, of the stator spiral groove 7, the spiral groove hole 11 is formed in the position, close to a last-stage positive impeller 3, of the stator spiral groove 7, the excircle diameters of the rotor spiral grooves 8 are equal, the spiral grooves are formed in the position of the excircle wall surface of the rotor spiral groove 8, the rotor spiral groove 8 is fixedly installed on a pump shaft 4, and the stator spiral groove 7 is fixedly installed on a water outlet section 1.
The spiral groove is a rectangular spiral groove formed on the wall surface of the inner cavity of the spiral groove hole 11 of the stator spiral groove 7 and the spiral groove formed on the outer circle wall surface of the rotor spiral groove 8, the thread pitch and the lead of the spiral groove are equal to the number of spiral heads, but the rotation directions of the spiral grooves are opposite.
The inner cavity of the water outlet section 1 is provided with a pressure relief cavity, the wall surface of the pressure relief cavity close to the rear cover plate of the final-stage positive impeller 3 is provided with a pressure relief hole A10, and the wall surface of the pressure relief cavity close to the final-stage positive guide vane 2 is provided with a pressure relief hole B9.
In the operation process of the self-balancing multistage centrifugal pump, the position of the stepped spiral groove annular dynamic seal close to the rear cover plate of the last-stage reverse impeller 7 is a high-pressure cavity, the position of the stepped spiral groove annular dynamic seal close to the rear cover plate of the last-stage positive impeller 3 is a low-pressure cavity, under the action of pressure difference between the two sides of the low-pressure cavity and the high-pressure cavity, a fluid medium firstly enters an annular cavity formed between a through hole 12 of the stator spiral groove 7 and the rotor spiral groove 8, the speed and the pressure of the fluid medium are reduced, then the fluid medium flows along an annular gap between a spiral groove hole 11 of the stator spiral groove 7 and the rotor spiral groove 8 under the action of pressure difference between the two sides of the low-pressure cavity and the high-pressure cavity, and the fluid medium between the spiral groove hole 11 of the stator spiral groove 1 and the rotor spiral groove 8 is severely stirred due to the fact that the rotor spiral groove 8 is installed and fixed on the pump shaft and rotates together with the pump shaft, so that the speed and pressure are further reduced, and the purpose of reducing leakage is achieved. In addition, a pressure relief cavity is arranged in the inner cavity of the water outlet section 1, a pressure relief hole A10 is formed in the position, close to the wall surface of the rear cover plate of the last-stage positive impeller 3, of the pressure relief cavity, a pressure relief hole B9 is formed in the position, close to the wall surface of the last-stage positive guide vane 2, of the pressure relief cavity, fluid at the position of the rear cover plate of the last-stage positive impeller 3 can flow to the position of the outlet of the last-stage positive guide vane 2 sequentially through the pressure relief hole A10, the pressure relief cavity and the pressure relief hole B9, the pressure at the position of the rear cover plate of the last-stage positive impeller 3 is further reduced, and the additional axial force of the whole pump unit is reduced.
Claims (4)
1. The utility model provides a cascaded helicla flute annular of self-balancing multistage pump water section moves seal structure, includes pump shaft (4), the positive impeller of last stage (3), the positive stator of last stage (2), the anti-impeller of last stage (6), the anti-stator of last stage (5), goes out water section (1) and cascaded helicla flute annular and moves sealedly, its characterized in that: the last-stage positive guide vane (3) is fixedly installed on the left side of the water outlet section (1), the last-stage reverse guide vane (5) is fixedly installed on the right side of the water outlet section (1), the stepped spiral groove annular dynamic seal is installed at the central hole of the water outlet section (1) through a fixing screw, the last-stage positive impeller (3) and the last-stage reverse impeller (6) are installed on the pump shaft (4) in a back-to-back mode through flat keys, the last-stage positive impeller (3) is installed in the inner cavity of the last-stage positive guide vane (2), and the last-stage reverse impeller (6) is installed in the inner cavity of the last-stage reverse guide vane (5).
2. The self-balancing multistage pump water outlet section stepped spiral groove annular dynamic seal structure of claim 1, wherein: the stepped spiral groove annular dynamic seal comprises a stator spiral groove (7) and a rotor spiral groove (8), wherein the stator spiral groove (7) consists of a spiral groove hole (11) and a through hole (12), the diameter of the through hole (12) is 1.1 times of that of the spiral groove hole (11), the spiral groove is not formed in the wall surface of an inner cavity of the through hole (12), the spiral groove is formed in the wall surface of the inner cavity of the spiral groove hole (11), the through hole (12) is formed in the position, close to a last-stage counter impeller (6), of the stator spiral groove (7), the spiral groove hole (11) is formed in the position, close to a last-stage positive impeller (3), of the stator spiral groove (7), the excircle diameters of the rotor spiral grooves (8) are equal, the spiral groove is formed in the excircle wall surface of the rotor spiral groove (8), the rotor spiral groove (8) is fixedly installed on a pump shaft (4), and the stator spiral groove (7) is fixedly installed on a water outlet section (1).
3. The self-balancing multistage pump water outlet section stepped spiral groove annular dynamic seal structure of claim 1, wherein: the spiral groove is a rectangular spiral groove, the pitch and the lead of the spiral groove are equal to the number of spiral heads, but the rotation directions of the spiral grooves are opposite.
4. The self-balancing multistage pump water outlet section stepped spiral groove annular dynamic seal structure of claim 1, wherein: the inner cavity of the water outlet section (1) is provided with a pressure relief cavity, the wall surface of the pressure relief cavity close to the rear cover plate of the final-stage positive impeller (3) is provided with a pressure relief hole A (10), and the wall surface of the pressure relief cavity close to the final-stage positive guide vane (2) is provided with a pressure relief hole B (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120978539.XU CN215566829U (en) | 2021-05-10 | 2021-05-10 | Stepped spiral groove annular dynamic sealing structure of water outlet section of self-balancing multi-stage pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120978539.XU CN215566829U (en) | 2021-05-10 | 2021-05-10 | Stepped spiral groove annular dynamic sealing structure of water outlet section of self-balancing multi-stage pump |
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| CN215566829U true CN215566829U (en) | 2022-01-18 |
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| CN202120978539.XU Active CN215566829U (en) | 2021-05-10 | 2021-05-10 | Stepped spiral groove annular dynamic sealing structure of water outlet section of self-balancing multi-stage pump |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115059622A (en) * | 2022-06-27 | 2022-09-16 | 南京科技职业学院 | Submersible sewage pump with sand prevention function |
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2021
- 2021-05-10 CN CN202120978539.XU patent/CN215566829U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115059622A (en) * | 2022-06-27 | 2022-09-16 | 南京科技职业学院 | Submersible sewage pump with sand prevention function |
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