CN104454628A - Seal pressure-relief device for pump in coal chemical industry - Google Patents
Seal pressure-relief device for pump in coal chemical industry Download PDFInfo
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- CN104454628A CN104454628A CN201410756214.1A CN201410756214A CN104454628A CN 104454628 A CN104454628 A CN 104454628A CN 201410756214 A CN201410756214 A CN 201410756214A CN 104454628 A CN104454628 A CN 104454628A
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- ring
- pressure relief
- seal
- pressure
- mechanical seal
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/086—Sealings especially adapted for liquid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention relates to a seal pressure-relief device for pump in coal chemical industry, and belongs to the coal chemical industry field. The seal pressure-relief device for pump in coal chemical industry comprises a throttle pressure-relief ring, a cover, a one-way seal ring and a mechanical seal short sleeve. The cover, the throttle pressure-relief ring and the inner wall of the front end of a pump cover are simultaneously passed through by a bolt, and the throttle pressure-relief ring and the one-way seal ring are axially located. The front section of the throttle pressure-relief ring is a throttle structure and the rear section is a pressure-relief cavity. The one-way seal ring comprises a variant ring and a locating ring, wherein the variant ring is processed by elastic materials, and the locating ring is processed by hard materials. The seal pressure-relief device has the advantages of simple structure, convenient installation and reliable seal and pressure-relieving effect. One-way passage is formed by a pump cavity and mechanical seal cavity. High pressure medium outside is effectively prevented from entering, also reliable seal by rinse water from the seal passage is realized, and thus the service life during delivering solid medium is greatly increased. The seal pressure-relief device for pump in coal chemical industry has important application value.
Description
Technical field
The present invention relates to a kind of Coal Chemical Industry pump sealing pressure relief device, belong to coal chemical technology.
Background technique
In coal chemical technology, some harsh station chemical flow-process pump inlet pressure is high, and fed sheet of a media temperature is high, and medium solid content is high, and the hardness ratio of solid particle is larger.Under such operating conditions, the Security of pump is had higher requirement, to the sealing configuration of pump except having resistance to compression, corrosion-resistant except, higher requirement be it is also proposed to wear resistance.
What existing chemical flow-process pump adopted unloads laminated structure; as shown in Figure 1; rectangle annular groove is had inside Rectifier plate 103; Rectifier plate 103 and impeller 101 and machine seal between short cover 105 and leave gap; can play throttling by this structure and reduce the effect of machine sealing chamber body pressure, thus protection machine envelope is from impacting with high pressure.
Because the medium inlet pressure of Coal Chemical Industry transport pump is high, fed sheet of a media temperature is high, and medium solid content is high, and the hardness ratio of solid particle is larger.Following situation is there will be: 1. mechanical seal rinsing water pressure is unstable, may be less than the pressure of pump chamber during pump operation; 2. the numerous start-stop of pumping frequency or rotary speed unstabilization are determined, and the pressure in pump chamber varies widely instantaneously.When the pressure of pump chamber is greater than the pressure of mechanical seal cavity, medium in pump chamber will sharply impulse machine seal chamber, high-pressure medium will flow in mechanical seal cavity with certain speed along axle sleeve and annular rectangle groove, mechanical seal impacted and washes away abrasion, holding the wearing and tearing mechanical seal of continuing property.Mechanical seal can affect the normal service life of mechanical seal, reduce the stability of whole apparatus system, add maintenance cost after being subject to impulsive load and abrasion.
Summary of the invention
The mechanical seal that the object of the invention is to unload to solve conventional pump sealing laminated structure can be subject to impulsive load and the abrasion of hard particles, can affect the working life of mechanical seal, reduce the problems such as the stability of pump, and provide a kind of pump to seal pressure relief device.
The object of the invention is to be achieved through the following technical solutions:
A kind of Coal Chemical Industry pump sealing pressure relief device of the present invention, comprises the short cover of throttling pressure relief ring, gland, one-way seal ring and mechanical seal;
Throttling pressure relief ring is loop configuration, the outer shroud of throttling pressure relief ring is processed with the ladder platform matched with shape in pump cover front end, the inner ring leading portion internal diameter of throttling pressure relief ring coordinates with impeller connecting end crest clearance, and the inwall of throttling pressure relief ring inner ring leading portion is processed with the rectangle annular groove of interruption, throttling pressure relief ring inner ring back segment has the ring decompression chamber that internal diameter is greater than impeller connecting end external diameter;
The inner ring front end of gland is processed with annular positioning groove;
One-way seal ring comprises elastic material and processes the positioning ring that Shape-changeable ring and hard material process, the Shape-changeable ring of free state is identical with locating ring structure, be the cone structure of restraining forward, the outer, rear end of cone structure extends outward annular connected unit, the annular connected unit of Shape-changeable ring is identical with the internal-and external diameter of the annular connected unit of positioning ring, the cone structure bore inner diameter of Shape-changeable ring is less than the external diameter of the short cover of mechanical seal, and the cone structure bore inner diameter of positioning ring coordinates with the crest clearance of the short cover of mechanical seal; Shape-changeable ring and positioning ring are adhesively fixed by respective annular connected unit and form taper component;
The front-end face of the short cover of mechanical seal presses closer the ear end face of impeller, and the fitting surface of the short cover of mechanical seal and impeller is sealed by seal ring, and the sidewall of the short cover of mechanical seal and impeller cooperation place is the circular orientation face of end face; Throttling pressure relief ring front end presses closer pump cover front inner wall by ladder platform structure, gland front end presses closer the rear end of throttling pressure relief ring, the annular connected unit of one-way seal ring is inserted in the annular positioning groove of gland, screw is simultaneously through gland, throttling pressure relief ring and pump cover front inner wall, and envoy flows pressure ring and one-way seal ring axially locating; Now, the circular orientation face Spielpassung of the inner ring leading portion of throttling pressure relief ring and the short cover of mechanical seal and impeller cooperation place, the endoporus of one-way seal ring front end Shape-changeable ring is interference fitted in the sidewall of the short cover of mechanical seal, and the endoporus of one-way seal ring rear end positioning ring coordinates with the sidewall spacers of the short cover of mechanical seal; The rear end of one-way seal ring arranges rinse water arrangement.
The inner ring leading portion of described throttling pressure relief ring and the matching gap in the short cover of mechanical seal and circular orientation face, impeller cooperation place are 0.3mm.
The tapering of one-way seal ring cone structure is 15 ° ~ 45 °.
The matching gap of one-way seal ring rear end positioning ring endoporus and the short cover sidewall of mechanical seal is 0.3mm.
In one-way seal ring the annular connected unit of Shape-changeable ring and the annular connected unit of positioning ring bonding after spacing be not more than 5mm.
The rectangular ring groove deep of throttling pressure relief ring inner ring leading portion is 1.5mm, groove width is 2mm.
Working procedure
When pump runs well, high-pressure washing water enters in the endoporus of one-way seal ring rear end positioning ring and the sidewall spacers of the short cover of mechanical seal, and the Shape-changeable ring dilatating and deformable of driven forward one-way seal ring front end, thus make high-pressure washing water through the inner ring of one-way seal ring and throttling pressure relief ring, realize the sealing to external agency; When generating pump cavity pressure is greater than sparge water pressure fortuitous event, throttling under the rectangle annular groove effect that first the external high pressure medium entered backward is interrupted at throttling pressure relief ring inner ring leading portion, then realize in the ring decompression chamber entering throttling pressure relief ring inner ring back segment reducing pressure; Now, one-way seal ring forefront pressure is greater than rear end pressure, the Shape-changeable ring of one-way seal ring front end draws in backward, and the gap blocked between one-way seal ring rear end positioning ring endoporus and the short cover sidewall of mechanical seal, external high pressure medium is made by one-way seal ring, to prevent it from leaking to mechanical seal side; After pump recovers normal operation, high-pressure washing water promotes the Shape-changeable ring dilatating and deformable of one-way seal ring front end again, while realization sealing, is gone out by the residual dielectric of throttling pressure relief ring inner ring, avoids residual dielectric to the wearing and tearing of mechanical seal.
Beneficial effect:
Sealing pressure relief device structure of the present invention is simple, easy for installation, and sealing, release is reliable for effect, makes pump chamber and mechanical seal cavity form half-duplex channel.Sealing pressure relief device of the present invention can effectively stop entering of external high pressure medium, can ensure that again sparge water realizes reliable sealing by sealing channel, greatly improves the working life in conveying hard medium envelope on opportunity, has important application value.
Accompanying drawing explanation
Fig. 1 is the structural representation of conventional seals pressure relief device;
Fig. 2 is the structural representation that the present invention seals pressure relief device;
Fig. 3 is the structural representation that the present invention seals one-way seal ring in pressure relief device;
Fig. 4 is the partial enlarged drawing of Fig. 2;
In figure, 1-impeller; 2-pump cover; 3-throttling pressure relief ring; 4-screw; 5-gland; 6-one-way seal ring; The short cover of 7-mechanical seal; 101-impeller; 102-pump cover; 103-Rectifier plate; 104-screw; 105-machine seals short cover.
Embodiment
Illustrate that the present invention is described further with embodiment below in conjunction with accompanying drawing:
Embodiment
A kind of Coal Chemical Industry pump sealing pressure relief device of the present invention, as shown in Figure 2, comprises the short cover 7 of throttling pressure relief ring 3, gland 5, one-way seal ring 6 and mechanical seal;
Throttling pressure relief ring 3 is loop configuration, the outer shroud of throttling pressure relief ring 3 is processed with the ladder platform matched with shape in pump cover 2 front end, the inner ring leading portion internal diameter of throttling pressure relief ring 3 coordinates with impeller 1 connecting end crest clearance, and the inwall of throttling pressure relief ring 3 inner ring leading portion is processed with the rectangle annular groove of interruption, throttling pressure relief ring 3 inner ring back segment has the ring decompression chamber that internal diameter is greater than impeller 1 connecting end external diameter;
The inner ring front end of gland 5 is processed with annular positioning groove;
As shown in Figure 3, one-way seal ring 6 comprises elastic material and processes the positioning ring that Shape-changeable ring and hard material process, the Shape-changeable ring of free state is identical with locating ring structure, be the cone structure of restraining forward, the outer, rear end of cone structure extends outward annular connected unit, the annular connected unit of Shape-changeable ring is identical with the internal-and external diameter of the annular connected unit of positioning ring, the cone structure bore inner diameter of Shape-changeable ring is less than the external diameter of the short cover of mechanical seal, and the cone structure bore inner diameter of positioning ring coordinates with the crest clearance of the short cover of mechanical seal; Shape-changeable ring and positioning ring are adhesively fixed by respective annular connected unit and form taper component;
The front-end face of the short cover 7 of mechanical seal presses closer the ear end face of impeller 1, and the short cover 7 of mechanical seal is sealed by seal ring with the fitting surface of impeller 1, and the short cover 7 of mechanical seal and the sidewall of impeller 1 cooperation place are the circular orientation face of end face; Throttling pressure relief ring 3 front end presses closer pump cover 2 front inner wall by ladder platform structure, gland 5 front end presses closer the rear end of throttling pressure relief ring 3, the annular connected unit of one-way seal ring 6 is inserted in the annular positioning groove of gland 5, screw 4 is simultaneously through gland 5, throttling pressure relief ring 3 and pump cover 2 front inner wall, and envoy flows pressure ring 3 and one-way seal ring 6 axially locating; Now, the circular orientation face Spielpassung of the inner ring leading portion of throttling pressure relief ring 3 and the short cover 7 of mechanical seal and impeller 1 cooperation place, the endoporus of one-way seal ring 6 front end Shape-changeable ring is interference fitted in the sidewall of the short cover 7 of mechanical seal, and the endoporus of one-way seal ring 6 rear end positioning ring coordinates with the sidewall spacers of the short cover 7 of mechanical seal; The rear end of one-way seal ring 6 arranges rinse water arrangement.
As shown in Figure 4, the inner ring leading portion of described throttling pressure relief ring 3 and the matching gap in the short cover 7 of mechanical seal and circular orientation face, impeller 1 cooperation place are 0.3mm.
The rectangular ring groove deep of throttling pressure relief ring 3 inner ring leading portion is 1.5mm, groove width is 2mm.
The tapering of one-way seal ring 6 cone structure is 27 °.
The matching gap of one-way seal ring 6 rear end positioning ring endoporus and mechanical seal short cover 7 sidewall is 0.3mm.
In one-way seal ring 6 the annular connected unit of Shape-changeable ring and the annular connected unit of positioning ring bonding after spacing be 4mm.
Working procedure
When pump runs well, high-pressure washing water enters in the endoporus of one-way seal ring 6 rear end positioning ring and the sidewall spacers of the short cover 7 of mechanical seal, and the Shape-changeable ring dilatating and deformable of driven forward one-way seal ring 6 front end, thus make high-pressure washing water through the inner ring of one-way seal ring 6 and throttling pressure relief ring 3, realize the sealing to external agency; When generating pump cavity pressure is greater than sparge water pressure fortuitous event, throttling under the rectangle annular groove effect that first the external high pressure medium entered backward is interrupted at throttling pressure relief ring 3 inner ring leading portion, then realize in the ring decompression chamber entering throttling pressure relief ring 3 inner ring back segment reducing pressure; Now, one-way seal ring 6 forefront pressure is greater than rear end pressure, the Shape-changeable ring of one-way seal ring 6 front end draws in backward, and the gap blocked between one-way seal ring 6 rear end positioning ring endoporus and mechanical seal short cover 7 sidewall, external high pressure medium is made by one-way seal ring 6, to prevent it from leaking to mechanical seal side; After pump recovers normal operation, high-pressure washing water promotes the Shape-changeable ring dilatating and deformable of one-way seal ring 6 front end again, while realization sealing, is gone out by the residual dielectric of throttling pressure relief ring 3 inner ring, avoids residual dielectric to the wearing and tearing of mechanical seal.
Claims (6)
1. a Coal Chemical Industry pump sealing pressure relief device, is characterized in that: comprise the short cover of throttling pressure relief ring, gland, one-way seal ring and mechanical seal;
Throttling pressure relief ring is loop configuration, the outer shroud of throttling pressure relief ring is processed with the ladder platform matched with shape in pump cover front end, the inner ring leading portion internal diameter of throttling pressure relief ring coordinates with impeller connecting end crest clearance, and the inwall of throttling pressure relief ring inner ring leading portion is processed with the rectangle annular groove of interruption, throttling pressure relief ring inner ring back segment has the ring decompression chamber that internal diameter is greater than impeller connecting end external diameter;
The inner ring front end of gland is processed with annular positioning groove;
One-way seal ring comprises elastic material and processes the positioning ring that Shape-changeable ring and hard material process, the Shape-changeable ring of free state is identical with locating ring structure, be the cone structure of restraining forward, the outer, rear end of cone structure extends outward annular connected unit, the annular connected unit of Shape-changeable ring is identical with the internal-and external diameter of the annular connected unit of positioning ring, the cone structure bore inner diameter of Shape-changeable ring is less than the external diameter of the short cover of mechanical seal, and the cone structure bore inner diameter of positioning ring coordinates with the crest clearance of the short cover of mechanical seal; Shape-changeable ring and positioning ring are adhesively fixed by respective annular connected unit and form taper component;
The front-end face of the short cover of mechanical seal presses closer the ear end face of impeller, and the fitting surface of the short cover of mechanical seal and impeller is sealed by seal ring, and the sidewall of the short cover of mechanical seal and impeller cooperation place is the circular orientation face of end face; Throttling pressure relief ring front end presses closer pump cover front inner wall by ladder platform structure, gland front end presses closer the rear end of throttling pressure relief ring, the annular connected unit of one-way seal ring is inserted in the annular positioning groove of gland, screw is simultaneously through gland, throttling pressure relief ring and pump cover front inner wall, and envoy flows pressure ring and one-way seal ring axially locating; Now, the circular orientation face Spielpassung of the inner ring leading portion of throttling pressure relief ring and the short cover of mechanical seal and impeller cooperation place, the endoporus of one-way seal ring front end Shape-changeable ring is interference fitted in the sidewall of the short cover of mechanical seal, and the endoporus of one-way seal ring rear end positioning ring coordinates with the sidewall spacers of the short cover of mechanical seal; The rear end of one-way seal ring arranges rinse water arrangement.
2. a kind of Coal Chemical Industry pump sealing pressure relief device as claimed in claim 1, is characterized in that: the inner ring leading portion of described throttling pressure relief ring and the matching gap in the short cover of mechanical seal and circular orientation face, impeller cooperation place are 0.3mm.
3. a kind of Coal Chemical Industry pump sealing pressure relief device as described in claim 1,2, is characterized in that: the rectangular ring groove deep of throttling pressure relief ring inner ring leading portion is 1.5mm, groove width is 2mm.
4. a kind of Coal Chemical Industry pump sealing pressure relief device as claimed in claim 1, is characterized in that: the tapering of described one-way seal ring cone structure is 15 ° ~ 45 °.
5. a kind of Coal Chemical Industry pump sealing pressure relief device as described in claim 1,2,4, is characterized in that: the matching gap of described one-way seal ring rear end positioning ring endoporus and the short cover sidewall of mechanical seal is 0.3mm.
6. a kind of Coal Chemical Industry pump sealing pressure relief device as described in claim 1,2,4, is characterized in that: in described one-way seal ring the annular connected unit of Shape-changeable ring and the annular connected unit of positioning ring bonding after spacing be not more than 5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410756214.1A CN104454628B (en) | 2014-12-10 | 2014-12-10 | Seal pressure-relief device for pump in coal chemical industry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410756214.1A CN104454628B (en) | 2014-12-10 | 2014-12-10 | Seal pressure-relief device for pump in coal chemical industry |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104454628A true CN104454628A (en) | 2015-03-25 |
| CN104454628B CN104454628B (en) | 2017-01-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410756214.1A Expired - Fee Related CN104454628B (en) | 2014-12-10 | 2014-12-10 | Seal pressure-relief device for pump in coal chemical industry |
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| Country | Link |
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| CN (1) | CN104454628B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105782124A (en) * | 2016-03-16 | 2016-07-20 | 武汉工程大学 | Spiral groove heat dissipation and pressure reduction device for high-temperature centrifugal pump |
| CN110094353A (en) * | 2018-01-28 | 2019-08-06 | 吴军 | A kind of coal chemical industry pump sealing pressure relief device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3536140A1 (en) * | 1985-10-10 | 1987-04-16 | Klein Schanzlin & Becker Ag | CENTRIFUGAL PUMP UNIT |
| CN1828063A (en) * | 2006-03-31 | 2006-09-06 | 浙江水泵总厂有限公司 | High temperature high pressure hot-water circulating pump |
| CN1844678A (en) * | 2006-04-05 | 2006-10-11 | 丛铭 | Single-stage horizontal automatic-balancing centrifugal seal pump device |
| AU2004240949B2 (en) * | 2003-05-23 | 2009-11-19 | Weir Minerals Australia Ltd | Pressure relief arrangement for a pump |
| CN202251058U (en) * | 2011-09-08 | 2012-05-30 | 东营海森密封技术有限责任公司 | Oil film double mechanical sealing device for compressors |
| CN204327571U (en) * | 2014-12-10 | 2015-05-13 | 襄阳五二五泵业有限公司 | A kind of Coal Chemical Industry pump sealing pressure relief device |
-
2014
- 2014-12-10 CN CN201410756214.1A patent/CN104454628B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3536140A1 (en) * | 1985-10-10 | 1987-04-16 | Klein Schanzlin & Becker Ag | CENTRIFUGAL PUMP UNIT |
| AU2004240949B2 (en) * | 2003-05-23 | 2009-11-19 | Weir Minerals Australia Ltd | Pressure relief arrangement for a pump |
| CN1828063A (en) * | 2006-03-31 | 2006-09-06 | 浙江水泵总厂有限公司 | High temperature high pressure hot-water circulating pump |
| CN1844678A (en) * | 2006-04-05 | 2006-10-11 | 丛铭 | Single-stage horizontal automatic-balancing centrifugal seal pump device |
| CN202251058U (en) * | 2011-09-08 | 2012-05-30 | 东营海森密封技术有限责任公司 | Oil film double mechanical sealing device for compressors |
| CN204327571U (en) * | 2014-12-10 | 2015-05-13 | 襄阳五二五泵业有限公司 | A kind of Coal Chemical Industry pump sealing pressure relief device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105782124A (en) * | 2016-03-16 | 2016-07-20 | 武汉工程大学 | Spiral groove heat dissipation and pressure reduction device for high-temperature centrifugal pump |
| CN110094353A (en) * | 2018-01-28 | 2019-08-06 | 吴军 | A kind of coal chemical industry pump sealing pressure relief device |
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| Publication number | Publication date |
|---|---|
| CN104454628B (en) | 2017-01-11 |
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