CN109751277B - Positive and negative pressure working condition mechanical seal for self-priming pump - Google Patents
Positive and negative pressure working condition mechanical seal for self-priming pump Download PDFInfo
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- CN109751277B CN109751277B CN201910144489.2A CN201910144489A CN109751277B CN 109751277 B CN109751277 B CN 109751277B CN 201910144489 A CN201910144489 A CN 201910144489A CN 109751277 B CN109751277 B CN 109751277B
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- hole
- negative pressure
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- mechanical seal
- sealing
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- 238000007789 sealing Methods 0.000 claims abstract description 76
- 210000004907 gland Anatomy 0.000 claims abstract description 38
- 238000005086 pumping Methods 0.000 claims abstract description 19
- 238000011010 flushing procedure Methods 0.000 claims abstract description 7
- 230000037452 priming Effects 0.000 claims abstract description 4
- 238000010791 quenching Methods 0.000 claims description 28
- 230000000171 quenching effect Effects 0.000 claims description 28
- 239000007788 liquid Substances 0.000 claims description 16
- 238000004321 preservation Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims 2
- 238000001816 cooling Methods 0.000 abstract description 7
- 238000003466 welding Methods 0.000 abstract description 7
- 239000007789 gas Substances 0.000 description 14
- 239000002184 metal Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000002904 solvent Substances 0.000 description 4
- 239000000110 cooling liquid Substances 0.000 description 3
- 229920001774 Perfluoroether Polymers 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- UJMWVICAENGCRF-UHFFFAOYSA-N oxygen difluoride Chemical compound FOF UJMWVICAENGCRF-UHFFFAOYSA-N 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- -1 Polytetrafluoroethylene Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Applications Or Details Of Rotary Compressors (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The utility model provides a positive and negative pressure operating mode mechanical seal for self priming pump, includes gland and axle sleeve, be provided with negative pressure chamber sealing member in gland back hole, gland processing has independent hollow rapid cooling chamber, and the axle sleeve is installed on the pump shaft and is passed the gland hole, the axle sleeve excircle cover is equipped with bellows mechanical seal, bellows mechanical seal movable ring and axle sleeve fixed mounting, stationary ring and gland inner boss fixed mounting, axle sleeve, bellows mechanical seal, negative pressure chamber sealing member and gland constitute the negative pressure chamber together, set up on the gland with the cavity link up flushing hole, with the negative pressure chamber link up the gas vent and with rapid cooling chamber link up the flowing back hole, rapid cooling hole. The vacuum pumping device pumps vacuum to the pump cavity before the pump is started, and simultaneously pumps vacuum to the inside of the mechanical seal of the corrugated pipe through the air pumping hole, so that the influence of the vacuum pumping in the pump cavity on the welding seam of the corrugated pipe wave plate is counteracted, and the stress condition of the corrugated pipe is improved.
Description
Technical Field
The invention relates to the technical field of sealing, in particular to a mechanical seal for a self-priming pump under positive and negative pressure working conditions, which is suitable for sealing high-temperature and solvent media.
Background
The welded metal corrugated pipe mechanical seal has good floatability and random compensation, and a dynamic auxiliary sealing ring of a general push ring type spring mechanical seal is not required to be arranged, so that the problem that the sealing compensation capability is reduced due to the fact that the dynamic auxiliary sealing ring slides on a shaft to generate axial friction resistance can be avoided, and the problem that the auxiliary sealing ring is not resistant to high temperature, solvents and the like can be avoided, and the mechanical seal is very common. The normal working state of the welded metal corrugated pipe mechanical seal is that the outside of the corrugated pipe is filled with medium, positive pressure is adopted, the inner hole is communicated with the atmosphere, and normal pressure is adopted, so that the stress state of the welded metal corrugated pipe mechanical seal is only resistant to the external positive pressure and is not resistant to the negative pressure. With the continuous perfection of self-priming pump technology, the safety and stability of the self-priming pump are higher and higher, and the application range of the self-priming pump for lifting the working condition under the medium liquid is wider and wider. When the self-priming pump is started, because the pump cavity and the suction pipeline are filled with air, the vacuum pumping is needed to discharge gas, the interior of the pump is at negative pressure, and as the air in the suction pipeline is discharged, medium in the tank is sucked up into the pump cavity, and the interior of the pump cavity is converted from negative pressure into positive pressure after the pump formally operates. Therefore, the pressure in the pump cavity of the self-priming pump is in a positive-negative alternating state, particularly the pump is in a fault state, the pump is frequently started during maintenance, the frequent positive-negative alternating change in the pump cavity can cause the fracture of a welding seam of a mechanical seal wave plate of a welded metal corrugated pipe arranged in the seal cavity, the self-priming pump can only adopt spring type mechanical seal, and when the spring type mechanical seal is used under the condition that high temperature and medium are solvents, the auxiliary sealing ring is manufactured by using Polytetrafluoroethylene (PTFE), and the highest use temperature is about 200 ℃, so that the sealing requirement of the high-temperature pump is not met. The flexible graphite is high-temperature resistant, but has low strength and is easy to damage, and can not adapt to the working condition that the working state of the spring seal moving ring sealing ring needs to slide along the axial direction. Although the perfluoroether rubber ring can raise the limit temperature to some extent, the perfluoroether rubber ring can only resist 300 ℃ and is expensive. The mechanical seal of the welded metal corrugated pipe which is commonly used as the working condition of high temperature and solvent medium cannot be selected because of being incapable of adapting to the alternating change of positive and negative pressure when the self-priming pump works.
Disclosure of Invention
The invention aims to provide a welded metal corrugated pipe mechanical seal which can still be normally used under the condition of alternating positive and negative pressure working conditions.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the utility model provides a positive and negative pressure operating mode mechanical seal for self priming pump, includes gland and axle sleeve, the hole has been seted up to gland back, is provided with negative pressure chamber sealing member in the hole, and negative pressure chamber sealing member passes through bolt and gland fixed mounting, and gland processing has independent hollow rapid cooling chamber, and gland passes through bolt fixed mounting on the pump cover, the axle sleeve is installed on the pump shaft and passes the gland hole, and the axle sleeve excircle cover is equipped with bellows mechanical seal, and bellows mechanical seal moving ring passes through bolt fixed mounting with the axle sleeve, and bellows mechanical seal moving ring passes through bolt and gland inner boss fixed mounting, axle sleeve, bellows mechanical seal, negative pressure chamber sealing member and gland are constituteed the negative pressure chamber together, have seted up four holes on the gland, are wash hole, gas pumping hole, flowing back hole and rapid cooling hole respectively, wash hole link up with the chamber, the gas pumping hole link up with the negative pressure chamber, flowing back hole and rapid cooling hole link up with the rapid cooling chamber.
The air suction hole is connected with the air suction hole of the vacuumizing device, the vacuumizing device vacuumizes the pump cavity and the negative pressure cavity simultaneously, cooling liquid enters from the quenching hole, flows through the quenching cavity and is discharged from the liquid discharge hole to cool the mechanical seal, and heat preservation steam enters from the liquid discharge hole, flows through the quenching cavity and is discharged from the quenching hole to preserve heat of the mechanical seal.
The negative pressure cavity sealing member consists of an air charging hole, a sealing body and an air bag, wherein the air charging hole is formed in the sealing body, an air bag is arranged in an inner hole of the sealing body, an air outlet end of the air charging hole is communicated with the air bag, an air inlet end of the air charging hole of the negative pressure cavity sealing member is connected with an exhaust pipe of the vacuumizing device, the air discharged by the vacuumizing device charges the air bag to shrink the inner hole of the air bag, and the outer circle of the shaft sleeve is hooped by the inner wall of the air bag to realize the sealing of the negative pressure cavity sealing member to the negative pressure cavity; or the air inlet end of the air charging hole of the negative pressure cavity sealing member is connected with an external air source, the air bag is inflated by the external air source to shrink the inner hole of the air bag, and the outer circle of the shaft sleeve is hooped by the inner wall of the air bag so as to realize the sealing of the negative pressure cavity sealing member to the negative pressure cavity.
The beneficial effects of the invention are as follows:
1. the sealing gland is provided with the air suction hole communicated with the negative pressure cavity, the vacuum suction device is used for vacuumizing the pump cavity before the pump is started, and meanwhile, the air suction hole is used for vacuumizing the inside of the mechanical seal of the corrugated pipe, so that the influence of the vacuum suction in the pump cavity on welding seams of corrugated sheets of the corrugated pipe is counteracted, and the stress condition of the corrugated pipe is improved.
2. The vacuumizing device simultaneously vacuumizes the pump cavity and the negative pressure cavity, so that the device is multipurpose, and cost and equipment are saved;
3. the sealing pressure cover is provided with an independent hollow quenching cavity, the quenching cavity is provided with a liquid discharge hole and a quenching hole, the quenching cavity and the negative pressure cavity are separately arranged, and a liquid discharge hole and a quenching hole closing and opening device are not required to be additionally arranged, so that the phenomenon that when the inside of the corrugated pipe is mechanically sealed and pumped, the liquid discharge hole and the quenching hole are not closed can be prevented, and gas enters the negative pressure cavity from the liquid discharge hole or the quenching hole, so that the negative pressure cavity is failed to be pumped.
4. The inner wall of the air bag of the negative pressure cavity sealing member is tightly attached to the shaft sleeve only when the pump is vacuumized before running, and a gap is reserved between the inner wall of the air bag and the outer circle of the shaft sleeve when the pump is in normal running, so that the air bag can be ensured not to be worn due to high-speed rotation of the shaft sleeve, the service life is long, and the power loss caused by the tight attachment and mutual friction of the air bag and the shaft sleeve when the pump is running can be avoided.
5. The air bag is inflated by utilizing exhaust gas discharged by the vacuumizing device, the vacuumizing device starts to work, the vacuumizing device stops working and the inflation process is stopped at the same time, so that the air bag is ensured to be timely tightened and separated before the pump is operated, the vacuumizing and inflation processes in the whole process all use the original system, the whole process is not required to be controlled manually, a control system is not required to be additionally added, and the performance is safe and reliable, and the cost is low.
6. Because the inner wall of the air bag is far away from the outer circle of the shaft sleeve during the formal operation of the self-priming pump, the vacuumizing device of the self-priming pump has shorter vacuumizing process time (generally only tens of seconds), and the high temperature in the pump can not influence the air bag.
Drawings
FIG. 1 is a schematic diagram of the mechanical seal assembly (the vacuum pumping device supplies air) under the positive and negative pressure working conditions for the self-priming pump;
FIG. 2 is a second schematic diagram of the mechanical seal assembly under positive and negative pressure conditions for the self-priming pump (supplied by an external air source);
FIG. 3 is a rear view of the seal gland of the present invention;
FIG. 4 is a schematic view of the negative pressure chamber seal of the present invention;
FIG. 5 is a schematic view of a welded structure of a bellows of the device of the present invention;
1. the vacuum pumping device comprises a vacuum pumping device 2, an exhaust pipe of the vacuum pumping device 3, an air suction port of the vacuum pumping device 4, a shaft sleeve 5, a corrugated pipe mechanical seal 6, a sealing gland, 7, a quenching cavity 8, an air suction hole 9 and a negative pressure cavity, 10, negative pressure cavity sealing parts, 11, liquid discharge holes, 12, flushing holes, 13, quenching holes, 14, inflating holes, 15, sealing bodies, 16, air bags, 17, wave plates, 18, welding seams, 19, external air sources, 20, centrifugal pumps, 21 and sealing cavities.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples.
Example 1
As shown in fig. 1, fig. 3, fig. 4 and fig. 5, positive and negative pressure working condition mechanical seal for self priming pump comprises a sealing gland 6 and a shaft sleeve 4, wherein an inner hole is formed in the back of the sealing gland 6, a negative pressure cavity sealing element 10 is arranged in the inner hole, the negative pressure cavity sealing element 10 is fixedly mounted with the sealing gland 6 through bolts, an independent hollow quenching cavity 7 is processed on the sealing gland 6, the sealing gland 6 is fixedly mounted on a pump cover through bolts, the shaft sleeve 4 is mounted on a pump shaft and penetrates through the inner hole of the sealing gland 6, a bellows mechanical seal 5 is sleeved on the outer circle of the shaft sleeve 4, a moving ring of the bellows mechanical seal 5 is fixedly mounted with the shaft sleeve 4 through bolts, the stationary ring of the bellows mechanical seal 5 is fixedly mounted with a boss in the sealing gland 6 through bolts, a set of wave plates 17, the joint of the bellows in the bellows mechanical seal 5 is formed by a set of wave plates 17, and the joint of the wave plates 17 is welded together through plasma welding to form a welding joint 18, the shaft sleeve 4, the bellows mechanical seal 5, the negative pressure cavity 9 is formed by the negative pressure cavity 10 and the sealing gland 6, the sealing gland 6 and the shaft sleeve 4 are fixedly mounted with the shaft sleeve 4, the sealing gland 6 and the shaft sleeve 4 form a sealing cavity 21 through the sealing cavity 12, the vent hole 12 and the vent hole 13 are formed by the vent hole 13, the vent hole 13 and the vent hole 13, and the vent hole 13 are respectively formed by the vent hole 13.
The air suction hole 8 is connected with the air suction hole 3 of the vacuumizing device, the vacuumizing device 1 vacuumizes the pump cavity and the negative pressure cavity 9 at the same time, when the temperature of a pumping medium entering the sealing cavity 21 through the flushing hole 12 is higher than the temperature which can be borne by the corrugated pipe mechanical seal 5, the quenching cavity 7 is communicated with cooling liquid to cool the medium in the sealing cavity 21, the liquid is low in and out, the cooling liquid enters the quenching cavity 7 from the quenching hole 13 and is discharged from the liquid discharge hole 11, when the temperature of the pumping medium entering the sealing cavity 21 through the flushing hole 12 is lower than a certain temperature, the viscosity becomes too high or crystallization is caused, so that the normal use performance of the mechanical seal is affected, the temperature of the sealing cavity 21 is raised by heat-preserving steam, the air is high in and out, and the heat-preserving steam enters the quenching cavity 7 from the liquid discharge hole 11 and is discharged from the quenching hole 13.
The negative pressure cavity sealing member 10 is composed of an air charging hole 14, a sealing body 15 and an air bag 16, the air charging hole 14 is formed in the sealing body 15, the air bag 16 is arranged in an inner hole of the sealing body 15, an air outlet end of the air charging hole 14 is communicated with the air bag 16, an air inlet end of the air charging hole 14 of the negative pressure cavity sealing member 10 is connected with the exhaust pipe 2 of the vacuumizing device, air discharged by the vacuumizing device 1 charges the air bag 16 to enable the inner hole of the air bag 16 to be reduced, and the outer circle of the shaft sleeve 4 is tightly hooped by the inner wall of the air bag 16 so as to realize the sealing of the negative pressure cavity sealing member 10 to the negative pressure cavity 9.
The working principle of the invention is as follows:
before the centrifugal pump 20 is started, the vacuum pumping device 1 simultaneously pumps vacuum to the pump cavity of the centrifugal pump 20 and the negative pressure cavity 9 of the sealing gland 6, the air suction port 3 of the vacuum pumping device is respectively connected with the air suction holes 8 of the pump cavity of the centrifugal pump 20 and the negative pressure cavity 9, and the exhaust pipe 2 of the vacuum pumping device is respectively connected with the air charging hole 14 of the sealing piece 10 of the negative pressure cavity and the atmosphere or exhaust gas recovery device. The gas pumped from the pump cavity of the centrifugal pump 20 and the negative pressure cavity 9 of the vacuumizing device 1 is discharged from the exhaust pipe 2 of the vacuumizing device, a part of the gas is filled into the air bag 16 of the sealing member 10 of the negative pressure cavity, the rest of the gas enters the atmosphere, and when the discharged gas is toxic and harmful, the gas originally discharged to the atmosphere is discharged to the waste gas recovery device. When the air bag 16 is not filled with air, a gap is reserved between an inner hole and the outer circle of the shaft sleeve 4, after the vacuumizing device 1 starts vacuumizing, the negative pressure cavity 9 is negative pressure under the suction action of the vacuumizing device 1, air discharged by the exhaust pipe 2 of the vacuumizing device enters the air bag 16 under the combined action of the negative pressure cavity 9 and the positive pressure of the exhaust gas discharged by the exhaust pipe 2 of the vacuumizing device, the pressure difference between the inside and the outside of the air bag 16 can prevent the exhaust gas discharged by the exhaust pipe from being discharged to the atmosphere instead of entering the air bag 16, the inner wall of the air bag 16 is propped open by the air entering the air bag 16 to tightly wrap the outer circle of the shaft sleeve 4, the outside air can be prevented from entering the negative pressure cavity 9, the smooth realization of the vacuumizing of the negative pressure cavity 9 is ensured, and the inner pressure and the outer pressure of the corrugated pipe are the same at the moment. The corrugated tube wave plate 17 can not cause the wave plate 17 to open outwards due to internal and external pressure difference, so that the welding seam 18 of the wave plate 17 is cracked. When the suction medium fills the pump cavity, the vacuumizing of the pump cavity is finished, the suction port 3 of the vacuumizing device stops exhausting, the exhaust pipe 2 of the vacuumizing device stops exhausting, no gas is injected into the air bag 16, the inner wall of the air bag 16 is separated from the outer circle of the shaft sleeve 4, the inner hole of the mechanical seal 5 of the corrugated pipe is communicated with the atmosphere, the pressure is the atmospheric pressure, the centrifugal pump 20 runs formally, the pumping medium enters the seal cavity 21 from the flushing hole 12, the pressure in the seal cavity 21 becomes positive pressure, the pressure difference between the inside and the outside of the mechanical seal 5 of the corrugated pipe is positive pressure, and the normal working state of the pump is restored. The whole process utilizes the original system without additionally adding a control system, and the performance is safe and reliable.
Example 2
As shown in fig. 2, 3, 4 and 5, embodiment 2 is different from embodiment 1 in that the inflation hole 14 of the negative pressure cavity seal member 10 is connected with the external air source 19, the external air source 19 inflates the air bag 16 to reduce the inner hole of the air bag 16, and the inner wall of the air bag 16 is used for tightening the outer circle of the shaft sleeve 4 to seal the negative pressure cavity 9 by the negative pressure cavity seal member 10. The remainder was the same as in example 1.
Claims (2)
1. The positive and negative pressure working condition mechanical seal for the self-priming pump is characterized by comprising a sealing gland and a shaft sleeve, wherein an inner hole is formed in the back of the sealing gland, a negative pressure cavity sealing piece is arranged in the inner hole, the negative pressure cavity sealing piece is fixedly installed with the sealing gland through a bolt, an independent hollow quenching cavity is machined in the sealing gland, the sealing gland is fixedly installed on the pump cover through a bolt, the shaft sleeve is installed on a pump shaft and penetrates through the inner hole of the sealing gland, a corrugated pipe mechanical seal is sleeved on the outer circle of the shaft sleeve, a corrugated pipe mechanical seal moving ring is fixedly installed with the shaft sleeve through the bolt, the corrugated pipe mechanical seal moving ring is fixedly installed with an inner boss of the sealing gland through the bolt, the shaft sleeve, the corrugated pipe mechanical seal moving ring, the negative pressure cavity sealing piece and the sealing gland form a negative pressure cavity together, four holes are respectively a flushing hole, a pumping hole, a liquid discharging hole and a quenching hole, the flushing hole are communicated with the sealing cavity, the pumping hole is communicated with the negative pressure cavity, and the liquid discharging hole and the quenching hole are communicated with the quenching cavity;
the negative pressure cavity sealing member consists of an air charging hole, a sealing body and an air bag, wherein the air charging hole is formed in the sealing body, the air bag is arranged in an inner hole of the sealing body, an air outlet end of the air charging hole is communicated with the air bag, and an air inlet end of the air charging hole of the negative pressure cavity sealing member is connected with an exhaust pipe of the vacuumizing device or an external air source;
the air suction hole is connected with the air suction hole of the vacuumizing device, and the vacuumizing device vacuumizes the pump cavity and the negative pressure cavity simultaneously.
2. The positive and negative pressure condition mechanical seal for a self priming pump of claim 1, wherein: quenching liquid enters the flow quenching cavity from the quenching hole and is discharged from the liquid discharge hole, and heat preservation steam enters the flow quenching cavity from the liquid discharge hole and is discharged from the quenching hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910144489.2A CN109751277B (en) | 2019-02-27 | 2019-02-27 | Positive and negative pressure working condition mechanical seal for self-priming pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910144489.2A CN109751277B (en) | 2019-02-27 | 2019-02-27 | Positive and negative pressure working condition mechanical seal for self-priming pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109751277A CN109751277A (en) | 2019-05-14 |
| CN109751277B true CN109751277B (en) | 2024-02-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910144489.2A Active CN109751277B (en) | 2019-02-27 | 2019-02-27 | Positive and negative pressure working condition mechanical seal for self-priming pump |
Country Status (1)
| Country | Link |
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| CN (1) | CN109751277B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110145468B (en) * | 2019-05-25 | 2024-03-12 | 锦州重型水泵有限公司 | Method and device for maintaining negative pressure after water pump is stopped |
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