CN204511957U - With the mechanical face seals of centrifugal pumps structure of bidirectional screw seal ring - Google Patents
With the mechanical face seals of centrifugal pumps structure of bidirectional screw seal ring Download PDFInfo
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- CN204511957U CN204511957U CN201520096755.6U CN201520096755U CN204511957U CN 204511957 U CN204511957 U CN 204511957U CN 201520096755 U CN201520096755 U CN 201520096755U CN 204511957 U CN204511957 U CN 204511957U
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Abstract
The utility model discloses a kind of mechanical face seals of centrifugal pumps structure with bidirectional screw seal ring, spiral seal ring (7) is fixed on the right side of end cap (4), this spiral seal ring (7) is located on the periphery of axle sleeve (3), the first spiral chute (7a) is offered at the left part of spiral seal ring (7) inwall, the right part of spiral seal ring (7) inwall offers the second spiral chute (7b), the Hand of spiral of the first spiral chute (7a) and the second spiral chute (7b) is contrary, air passageways (7c) is set between the first spiral chute (7a) and the second spiral chute (7b), this air passageways (7c) is radially through to inwall from the outer wall of spiral seal ring (7).Air after filtration can be divided into two-way by the utility model, send in mechanical seal after one tunnel pressurization, gap place between rotating ring and axle sleeve and the gap place pressure reduction between rotating ring and stationary ring are reduced, thus effectively reducing leakage, another road plays a part wash away gap and stop dust in air.
Description
Technical field
The utility model belongs to centrifugal pump technical field, specifically, and particularly a kind of mechanical face seals of centrifugal pumps structure with bidirectional screw seal ring.
Background technique
At present, the sealing of mechanical face seals of centrifugal pumps end cap and axle sleeve adopts clearance seal or labyrinth seal mostly, and following problem easily appears in this seal form:
1, because dynamic and static ring surface of contact atmospheric side is directly communicated with air, the relative pressure of atmospheric side is 0, and the sealing surface pressure reduction of dynamic and static ring contacting point is comparatively large, and leakage rate is larger.
2, clearance seal and labyrinth seal cannot effectively stop the dust in air to enter in mechanical seal.Dust arrives the gap place between rotating ring and axle sleeve, when operational condition change (as pressure surge), auxiliary seal ring under rotating ring also will make axial inching, powder particle is by the sword limit relative movement with auxiliary seal ring, because teflon rebound elasticity is poor, make sword limit place form slit, cause the axial leakage along auxiliary seal ring.
3, after dust arrives the gap place between rotating ring and stationary ring, dynamic and static ring contact surface abrasion will be caused to aggravate, the mechanical seal life-span is reduced.
4, the dust in air is piled up in gap or labyrinth, if can not get timely cleaning, generation is rubbed, has both exacerbated the wearing and tearing of part, also consumes a large amount of power between axle (axle sleeve) and end cover.
Model utility content
Technical problem to be solved in the utility model is to provide a kind of mechanical face seals of centrifugal pumps structure that can effectively reduce the band bidirectional screw seal ring of leakage.
The technical solution of the utility model is as follows: a kind of mechanical face seals of centrifugal pumps structure with bidirectional screw seal ring, axle (2) is worn in the pump housing (1), axle (2) overlaps admittedly axle sleeve (3), end cap (4) is installed in the right part of the pump housing (1), stationary ring (5) is provided with between this end cap (4) and axle sleeve (3), stationary ring (5) is fixed on end cap (4), rotating ring (6) is provided with in the left side of described stationary ring (5), the sealing surface of rotating ring (6) and the left part of stationary ring (5) are close to, its key is: fix spiral seal ring (7) on the right side of described end cap (4), this spiral seal ring (7) is located on the periphery of axle sleeve (3), the first spiral chute (7a) is offered at the left part of described spiral seal ring (7) inwall, the right part of spiral seal ring (7) inwall offers the second spiral chute (7b), the Hand of spiral of the first spiral chute (7a) and the second spiral chute (7b) is contrary, between described first spiral chute (7a) and the second spiral chute (7b), air passageways (7c) is set, this air passageways (7c) is radially through to inwall from the outer wall of spiral seal ring (7).
Adopt above technological scheme, first spiral chute of spiral seal ring left part produces pumping effect under the rotation of axle, send into after the air pressurized that air passageways is come in mechanical seal, gap place between rotating ring and axle sleeve and the gap place pressure reduction between rotating ring and stationary ring reduce, and the leakage of mechanical seal reduces; Second spiral chute of spiral seal ring right part produces pumping effect under the rotation of axle, air passageways is come air axially blow out along the gap of axle sleeve and spiral seal interannular, play the effect of washing away gap and prevention dust in air.
In order to simplified structure, convenient for assembly, and prevent axial leakage, be embedded with auxiliary seal ring (8) at the left end of described rotating ring (6), this auxiliary seal ring (8) and axle sleeve (3) interference fit; Described auxiliary seal ring (8) is axially spacing by positioning seat (9), this positioning seat (9) is pressed on the left part of rotating ring (6) by the right-hand member of spring (10), left end and the spring seat (11) of spring (10) offset, and described spring seat (11) is fixed on axle sleeve (3).
First spiral chute is to obtain elevated pressures, and mechanical seal atmospheric side back pressure is increased, and reduces the leakage sealed everywhere, so the cross section of the first spiral chute (7a) is triangle; Second spiral chute be in order to obtain larger air mass flow to wash away the gap of spiral seal ring and shaft room better, prevent the dust in air from entering mechanical seal, so the cross section of the second spiral chute (7b) is trapezoidal.
Arrange air filter (12) in the inlet of described air passageways (7c) outer end, this air filter (12) is installed on spiral seal ring (7).Air filter plays filtered air, is entered in mechanical seal by air passageways to avoid the dust in air.
The beneficial effects of the utility model are:
1, the spiral chute that two sections of rotation directions are contrary is adopted, air after filtration can be divided into two-way, send in mechanical seal after one tunnel pressurization, gap place between rotating ring and axle sleeve and the gap place pressure reduction between rotating ring and stationary ring are reduced, thus effectively reduce leakage, another road plays a part wash away gap and stop dust in air, dynamic and static ring contact surface abrasion can be avoided to aggravate, ensure that the working life of mechanical seal.
2, the projected life of general centrifugal pump is 20 years (continuous operation is 3 years), and mechanical seal must be changed once for most about 1 year.Spiral seal ring in the utility model need not be changed, and only need clear up the dust of air filter and spiral chute inner accumulated when changing mechanical seal, just can be used for next mechanical seal, its cost is very low, and cost performance is very high.
3, simple, the highly versatile of the utility model manufacture, is particularly suitable for the mechanical face seals of centrifugal pumps transforming the Northwest's (the Northwest's dust storm is larger) outdoor, chemical plant.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the structural representation of spiral seal ring.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail:
As shown in Figure 1, wear axle 2 in the pump housing 1 of centrifugal pump, this axle 2 can rotate relative to the pump housing 1.Axle 2 overlaps axle sleeve 3 admittedly, and end cap 4 is installed in the pump housing 1 such as illustrated right part, and end cap 4 is fixed by many bolts and the pump housing 1.Between end cap 4 and axle sleeve 3, be provided with stationary ring 5, stationary ring 5 is made up of graphite, and this stationary ring 5 is secured by bolts on end cap 4.Be provided with rotating ring 6 in the left side of stationary ring 5, rotating ring 6 ring set is peripheral at axle sleeve 3, and rotating ring 6 is made up of cemented carbide Tungsten carbite.The right side of rotating ring 6 is sealing surface, and the left part of the sealing surface of rotating ring 6 and stationary ring 5 is close to.In the left end of rotating ring 6, be embedded with auxiliary seal ring 8, this auxiliary seal ring 8 is made up of teflon, and auxiliary seal ring 8 and axle sleeve 3 interference fit.Auxiliary seal ring 8 is axially spacing by the step surface in rotating ring 6 to the right, spacing by positioning seat 9 left.Positioning seat 9 is pressed on the left part of rotating ring 6 by the right-hand member of spring 10, and left end and the spring seat 11 of spring 10 offset, and spring seat 11 is fixed on axle sleeve 3.
As shown in Figure 1 and Figure 2, arrange spiral seal ring 7 on the right side of end cap 4, this spiral seal ring 7 is close to fixing with the right side of end cap 4, and spiral seal ring 7 is located on the periphery of axle sleeve 3.Offer the first spiral chute 7a at the left part of spiral seal ring 7 inwall, the cross section of the first spiral chute 7a is triangle; The right part of spiral seal ring 7 inwall offers the second spiral chute 7b, and the cross section of the second spiral chute 7b is trapezoidal, and the Hand of spiral of the second spiral chute 7b is contrary with the Hand of spiral of the first spiral chute 7a.The concrete rotation direction of above two spiral fluted is then determined according to the rotation direction of pump shaft, can obtain correctly compression direction to make air.Between the first spiral chute 7a and the second spiral chute 7b, arrange air passageways 7c, this air passageways 7c is radially through to inwall from the outer wall of spiral seal ring 7.Arrange air filter 12 in the inlet of air passageways 7c outer end, air filter 12 is installed on spiral seal ring 7.
The structure that centrifugal pump does not describe is same as the prior art, and therefore not to repeat here.
Claims (4)
1. the mechanical face seals of centrifugal pumps structure with bidirectional screw seal ring, axle (2) is worn in the pump housing (1), axle (2) overlaps admittedly axle sleeve (3), end cap (4) is installed in the right part of the pump housing (1), stationary ring (5) is provided with between this end cap (4) and axle sleeve (3), stationary ring (5) is fixed on end cap (4), rotating ring (6) is provided with in the left side of described stationary ring (5), the sealing surface of rotating ring (6) and the left part of stationary ring (5) are close to, it is characterized in that: fix spiral seal ring (7) on the right side of described end cap (4), this spiral seal ring (7) is located on the periphery of axle sleeve (3), the first spiral chute (7a) is offered at the left part of described spiral seal ring (7) inwall, the right part of spiral seal ring (7) inwall offers the second spiral chute (7b), the Hand of spiral of the first spiral chute (7a) and the second spiral chute (7b) is contrary, between described first spiral chute (7a) and the second spiral chute (7b), air passageways (7c) is set, this air passageways (7c) is radially through to inwall from the outer wall of spiral seal ring (7).
2. the mechanical face seals of centrifugal pumps structure of band bidirectional screw seal ring according to claim 1, it is characterized in that: be embedded with auxiliary seal ring (8) at the left end of described rotating ring (6), this auxiliary seal ring (8) and axle sleeve (3) interference fit; Described auxiliary seal ring (8) is axially spacing by positioning seat (9), this positioning seat (9) is pressed on the left part of rotating ring (6) by the right-hand member of spring (10), left end and the spring seat (11) of spring (10) offset, and described spring seat (11) is fixed on axle sleeve (3).
3. the mechanical face seals of centrifugal pumps structure of band bidirectional screw seal ring according to claim 1 and 2, is characterized in that: the cross section of described first spiral chute (7a) is triangle, and the cross section of the second spiral chute (7b) is trapezoidal.
4. the mechanical face seals of centrifugal pumps structure of band bidirectional screw seal ring according to claim 3, it is characterized in that: arrange air filter (12) in the inlet of described air passageways (7c) outer end, this air filter (12) is installed on spiral seal ring (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520096755.6U CN204511957U (en) | 2015-02-10 | 2015-02-10 | With the mechanical face seals of centrifugal pumps structure of bidirectional screw seal ring |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520096755.6U CN204511957U (en) | 2015-02-10 | 2015-02-10 | With the mechanical face seals of centrifugal pumps structure of bidirectional screw seal ring |
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| CN204511957U true CN204511957U (en) | 2015-07-29 |
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| CN201520096755.6U Active CN204511957U (en) | 2015-02-10 | 2015-02-10 | With the mechanical face seals of centrifugal pumps structure of bidirectional screw seal ring |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105317732A (en) * | 2015-10-19 | 2016-02-10 | 陕西科技大学 | Sealing device of ammonia feeding device |
| CN109237044A (en) * | 2018-10-31 | 2019-01-18 | 东莞市华汇精密机械有限公司 | A kind of dry-type encapsulated device for twin-screw dry powder pump |
| CN113969982A (en) * | 2021-10-22 | 2022-01-25 | 重庆江增船舶重工有限公司 | Cooling method and structure of cantilever type supercritical carbon dioxide turbine |
-
2015
- 2015-02-10 CN CN201520096755.6U patent/CN204511957U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105317732A (en) * | 2015-10-19 | 2016-02-10 | 陕西科技大学 | Sealing device of ammonia feeding device |
| CN109237044A (en) * | 2018-10-31 | 2019-01-18 | 东莞市华汇精密机械有限公司 | A kind of dry-type encapsulated device for twin-screw dry powder pump |
| CN113969982A (en) * | 2021-10-22 | 2022-01-25 | 重庆江增船舶重工有限公司 | Cooling method and structure of cantilever type supercritical carbon dioxide turbine |
| CN113969982B (en) * | 2021-10-22 | 2023-12-15 | 重庆江增船舶重工有限公司 | Cooling method and structure of cantilever supercritical carbon dioxide turbine |
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