CN1045330C - A shaft seal device - Google Patents
A shaft seal device Download PDFInfo
- Publication number
- CN1045330C CN1045330C CN93116478A CN93116478A CN1045330C CN 1045330 C CN1045330 C CN 1045330C CN 93116478 A CN93116478 A CN 93116478A CN 93116478 A CN93116478 A CN 93116478A CN 1045330 C CN1045330 C CN 1045330C
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- seal
- seal ring
- mechanical
- ring
- atmospheric region
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Abstract
The present invention relates to a shaft sealing device which is composed of two sets of mechanical seals which are configured along an axial direction. Thus, a cleaning fluid area formed between the two mechanical seals is used for dividing and sealing a sealing fluid area and an atmosphere area. A first sealing ring is installed and fixed to a rotary shaft, and a second sealing ring pressing towards the first sealing ring is arranged on a shell body. A first seal at one side of the sealing fluid area is composed of contact seals. A second seal at one side of the atmosphere area is composed of non-contact seals. Cleaning gas of which the pressure is below the pressure of a sealing body is injected in the cleaning fluid area.
Description
The invention relates to a kind of being installed in such as the shaft sealer in the fluid machineries such as pump, particularly about a kind of shaft sealer that includes two groups of mechanical sealings, this device is mounted and fixed on first seal ring on the seal casinghousing or inserts on the running shaft of seal casinghousing, and in addition on the axle or on the housing second seal ring that is pressed against on first seal ring can be installed axially slidably, so that with the purge flow tagma that between two mechanical sealings, forms sealant flow tagma and atmospheric region are separated and seal.
As the shaft sealer of this pattern, as shown in Figure 5, the two winding touch mechanical seal 1a that dispose on opposite two directions, the so-called double sealing structure of 1b are known.
That is exactly each mechanical seal 1a, 1b is stationary seal ring 2a, 2b is fixed and held on the seal casinghousing 5 respectively, and rotary seal ring 3a, 3b remains on the running shaft 6 vertically slidably, seal ring 3a, 3b is by thrust device 4a, 4b is pressed to standstill seal ring 2a, 2b, and by means of seal ring 2a, 3a and 2b, the slip effect that relatively rotates of 3b, (pressure is meant with the atmospheric pressure to be the manometer pressure of benchmark herein) has washing fluid (water by being full of under suitable pressure, oil or other analog) the purge flow tagma C of L comes sealant flow tagma A and atmospheric pressure region B to be separated and seal.
In this common device, since the pressure P of washing fluid L ' be to act on sliding ring 3a as back pressure, on the 3b, therefore for two seal ring 2a among the mechanical seal 1a that makes sealant flow tagma A one side, keep suitable contact between the 3a, will set and make washing fluid pressure P ' be higher than a particular magnitude Δ of sealing-fluid pressure P P (P '=P+ Δ P), this be because, if washing fluid pressure P ' be lower than sealing-fluid pressure P, each seal ring 2a so, 3a just can not remain on suitable contact condition, and must be increased to by exerting pressure of providing of spring 4a and pushing force and to surpass required value.
Yet, as mentioned above, be used for the mechanical seal 1a that between sealant flow tagma A and purge flow tagma C, seals, washing fluid pressure P ' must set for greater than sealing-fluid pressure P, particularly when fluid-encapsulated be volatile fluid or low boiling fluid for example during liquid ammonia, the liquid lubrication film that forms between seal ring 2a, 3a is easily destroyed by frictional heat, this just makes that sealing wrecks, in case seals damaged is bad, cleaning liquid L will leak into the side of sealant flow tagma A.
On the other hand, the second mechanical seal 1b that is used for sealing between atmospheric region B and the purge flow tagma C is a contact seal, so will be damaged under the high pressure condition of the pressure difference (P+ Δ P) of its sealing function between area B and C when very high.
Like this, usually the global reliability of device is low, and often because the restriction of air-proof condition (character of sealed fluid and pressure condition), and it can not be used well.In addition, need configuration of peripheral devices as they, thereby make the structure of device become more complicated for washing fluid L can be circulated.
Thereby main purpose of the present invention provides a kind of shaft sealer of higher reliability energy, even this device also can show good and stable sealability under condition of high voltage or when volatile fluid as the liquid ammonia or low boiling fluid.
Another object of the present invention provides a kind of structure of the device that can simplify and need not to use the shaft sealer of the peripheral unit of wash cycles fluid.
According to shaft sealer of the present invention, it is used for sealing between a seal casinghousing and a running shaft, this running shaft can around one on vertically the axis rotation and pass described seal casinghousing and stretch into a sealant flow tagma and an atmospheric region,
It is characterized in that,
Described shaft sealer is included in first mechanical seal of sealant flow tagma one side and in second mechanical seal of atmospheric region, separate on the axial direction of running shaft mutually the position of this two mechanical seal, thereby lean against the purge flow tagma that forms between first mechanical seal and second mechanical seal with the sealant flow tagma with atmospheric region is isolated and sealing
Each of mechanical seal all comprises one first seal ring and one second seal ring, and second seal ring can slide on the axial direction of running shaft, wherein:
First mechanical seal is a contact seal, between sealant flow tagma and purge flow tagma, thereby in the face of the space of the second seal ring ear end face is communicated with the sealant flow tagma,
Second mechanical seal is a noncontact seal, have a groove that is formed on the generation kinetic pressure on the seal ring seal end face, sealing is between purge flow tagma and atmospheric region, thereby the space of facing the second seal ring ear end face is communicated with the purge flow tagma, and
Injection pressure is lower than the washing fluid of the non-activity gas of sealant flow tagma hydrodynamic pressure in the purge flow tagma.
In shaft sealer of the present invention, can make the state that mechanical seal is provided with respect to first seal ring with second seal ring that is positioned at atmospheric region one side, first seal ring is mounted and fixed on the rotatingshaft, and second seal ring axially is supported on the seal casinghousing slidably.
In shaft sealer of the present invention, can make mechanical seal and on seal casinghousing, install and fix first seal ring with respect to the state of the second seal ring setting, and can be supported in second seal ring on the running shaft axially slidably with first seal ring that is positioned at atmospheric region one side.
In shaft sealer of the present invention, can make first mechanical seal and on running shaft, install and fix first seal ring with respect to the state of the first seal ring setting with second seal ring that is positioned at atmospheric region one side, and on seal casinghousing, second seal ring can be installed axially slidably, second mechanical seal is then installed on seal casinghousing with respect to the state of the second seal ring setting with first seal ring that is positioned at atmospheric region one side and is fixed first seal ring, and on running shaft second seal ring can be installed axially slidably.
In shaft sealer of the present invention, can make first mechanical seal and on seal casinghousing, install and fix first seal ring with respect to the state of the second seal ring setting with first seal ring that is positioned at atmospheric region one side, and second seal ring is installed axially movably on running shaft, second mechanical seal is then installed on running shaft with respect to the state of the first seal ring setting with second seal ring that is positioned at atmospheric region one side and is fixed first seal ring, and on housing second seal ring can be installed axially slidably.
In shaft sealer of the present invention, purge gas and fluid-encapsulated pressure difference are 0.5-10kg/cm
2
In shaft sealer of the present invention, purge gas and fluid-encapsulated pressure difference are 5kg/cm
2
In shaft sealer of the present invention, washing solution is injected in the contact segment of seal ring of first mechanical seal.
Now, describe in detail and describe other purposes of the present invention and structural feature by following relevant drawings and the specific embodiments.Wherein:
Fig. 1 is expression associated sealing arrangement for bearings first an embodiment's of the present invention sectional view;
Fig. 2 is expression associated sealing arrangement for bearings second an embodiment's of the present invention sectional view;
Fig. 3 is expression associated sealing arrangement for bearings the 3rd an embodiment's of the present invention sectional view;
Fig. 4 is expression associated sealing arrangement for bearings the 4th an embodiment's of the present invention sectional view; With
Fig. 5 is the expression sectional view of device usually.
Fig. 1 represents the most preferred embodiment of shaft sealer of the present invention, this shaft sealer is to separate and seal a sealant flow tagma A and atmospheric region B by a purge flow tagma C who forms between two groups of mechanical seals 11,21, and two mechanical seal 11,21 is all between seal casinghousing 15 and insertion running shaft 16 wherein and be configured to be in the state of the axial direction that is parallel to running shaft 16.
First mechanical seal 11 in sealant flow tagma A one side is to be made of the contact seal form, and it can will seal between sealant flow tagma A and the purge flow tagma C by the relatively rotating of seal ring 12,13 that is contacted with each other by the fluid-encapsulated fluid lubrication film that forms.
Second mechanical seal 21 in atmospheric region B one side is to be made of the noncontact seal form, it can make the seal ring in relative rotation 22,23 that is in contactless state that atmospheric region B and cleaning area C are sealed with the kinetic pressure that produces betwixt, form with spirality to its outer circumferential sides or to inner circumferential side on the end face of rotating seal ring 22, T shape, rectangle or similar opening etc. produce the groove 22a of dynamic pressure thereupon.
Two mechanical seals 11,21 are all towards same direction location, so standstill seal ring 13,23 can be positioned at atmospheric region B one side with respect to rotary seal ring 12,22, thereby the hydrodynamic pressure P ' at C place, purge flow tagma acts on the standstill seal ring 13,23 with the form of back-pressure respectively in the hydrodynamic pressure P that can make in first mechanical seal 11 at A place, sealant flow tagma and second mechanical seal 21.
In addition, purge gas G injects purge flow tagma C with the lower pressure P ' (=P-Δ P) that is lower than sealing-fluid pressure P.If pressure difference Δ P between the two is excessive, then the load in first mechanical seal 11 of contact-type increases, and correspondingly heating increases, thereby when sealing volatility or low boiling fluid, the fluid lubrication film that forms between seal ring 12,13 is with destroyed.Therefore for avoiding this risk, pressure difference Δ P should be arranged on 0.5～10kg/cm aptly according to air-proof condition
2In the scope, 5kg/cm preferably
2About.Purge gas G should select according to fluid-encapsulated character, generally preferably uses the inert gas such as nitrogen.
In the relatively rotating parts of first mechanical seal 11, be designed to fill the structure of washing solution F.
The shaft sealer of Gou Chenging if sealed fluid is a high-pressure liquid, or also demonstrates excellent sealing performance under the situation of volatile fluid or low boiling fluid such as liquid ammonia like this.
In other words, be used for first mechanical seal 11 that between sealant flow tagma A and purge flow tagma C, seals, because sealing-fluid pressure P acts on the sliding ring 13 with the back-pressure form, even in washing fluid pressure P ' be lower than under the situation of sealed fluid flow pressure P (P-Δ P), seal ring 12,13 also can remain on suitable contact condition.Thereby washing fluid P ' remained on this low-pressure state, the load that seal ring 12,13 is acted on the sealed member significantly descends, no matter how are the character of sealed fluid and pressure condition, also can demonstrate good and stable sealability, just in case under the ruined situation of sealing, owing to fluid-encapsulatedly leak into zone C one side, thus can avoiding in prior art washing fluid invade situation generation among the regional A.
Because second mechanical seal 21 is contactless gas seals, and act on purge gas pressure P on the sliding ring 23 ' be lower than sealing-fluid pressure P, even under the high pressure condition, also can demonstrate excellent sealing performance with the back-pressure form.
In addition, because washing fluid G is gas, and the mechanical seal 21 of atmospheric region B one side is use gas seal, so do not need to be the circulate peripheral unit of usefulness of washing fluid G setting.
Yet the present invention also not only is confined to this embodiment, in the scope that does not break away from basic principle of the present invention, can carry out suitable change and correction.For example, mechanical seal 11 at the shaft sealer shown in Fig. 2, in 21, first seal ring 12,22 are mounted and fixed in the seal casinghousing 15, it is positioned at first contact ring 12 of atmospheric region B one side, 22 with respect to second seal ring 13,23 are provided with, and second seal ring 13,23 can be installed on the rotatingshaft 16 axially slidably, in shaft sealer shown in Figure 3, first seal ring 12 of first mechanical seal 11 is mounted and fixed on the rotatingshaft 16 with respect to the state that first seal ring 12 is provided with second seal ring 13 that is positioned at atmospheric region B one side, and second seal ring 13 then can be installed on the seal casinghousing 15 axially slidably.Equally, in second mechanical seal 21, first seal ring 22 is mounted and fixed on the seal casinghousing 15 with respect to the state that second seal ring 23 is provided with first seal ring 22 that is positioned at atmospheric region B one side, second seal ring 23 then axially is slidably mounted on the rotatingshaft 16, in shaft sealer shown in Figure 4, first seal ring 12 of first mechanical seal 11 is mounted and fixed on the seal casinghousing 15 with respect to the state that second seal ring 13 is provided with first seal ring 12 that is positioned at atmospheric region B one side, and second seal ring 13 then can be installed on the rotatingshaft 16 axially slidably.Equally, first seal ring 22 of second mechanical seal 21 is mounted and fixed on the rotatingshaft 16 with respect to the state that first seal ring 22 is provided with second seal ring 23 that is positioned at atmospheric region B one side, and second seal ring 23 then can be installed on the seal casinghousing 15 axially slidably.
Claims (8)
1. shaft sealer, be used between a seal casinghousing (15) and a running shaft (16), sealing, this running shaft (16) can around one on vertically the axis rotation and pass described seal casinghousing (15) and stretch into a sealant flow tagma (A) and an atmospheric region (B)
It is characterized in that,
Described shaft sealer is included in first mechanical seal (11) of sealant flow tagma (A) side and in second mechanical seal (21) of atmospheric region (B), separate on the axial direction of running shaft (16) mutually the position of this two mechanical seal, thereby the purge flow tagma (C) that leans against formation between first mechanical seal (11) and second mechanical seal (21) is with sealant flow tagma (A) and atmospheric region (B) isolation and sealing
Each of mechanical seal (11,21) all comprises one first seal ring (12,22) and one second seal ring (13,23), and second seal ring (13,23) can slide on the axial direction of running shaft (16), wherein:
First mechanical seal (11) is a contact seal, is positioned between sealant flow tagma (A) and purge flow tagma (C), thereby in the face of the space of second seal ring (13) ear end face is communicated with sealant flow tagma (A),
Second mechanical seal (21) is a noncontact seal, have a groove (22a) that is formed on the generation kinetic pressure on seal ring (22) seal face, sealing (21) is positioned between purge flow tagma (C) and the atmospheric region (B), thereby in the face of the space of second seal ring (23) ear end face is communicated with purge flow tagma (C), and
Be lower than the washing fluid (G) of the non-activity gas of sealant flow tagma (A) hydrodynamic pressure in purge flow tagma (C) injection pressure.
2. shaft sealer as claimed in claim 1, it is characterized in that, mechanical seal (11,21) state that is provided with respect to first seal ring (12,22) with second seal ring (13,23) that is positioned at atmospheric region (B) side, first seal ring (12,22) be mounted and fixed on the rotatingshaft (16), and second seal ring (13,23) axially is supported on the seal casinghousing (15) slidably.
3. shaft sealer as claimed in claim 1, it is characterized in that, mechanical seal (11,21) to be positioned at first seal ring (12 of atmospheric region (B) side, 22) first seal ring (12,22) is installed and fixed to the state that is provided with respect to second seal ring (13,23) on seal casinghousing (15), and can be supported in second seal ring (13,23) axially slidably on the running shaft (16).
4. shaft sealer as claimed in claim 1, it is characterized in that, first seal ring (12) is installed and fixed to first mechanical seal (11) for the state that first seal ring (12) is provided with comparatively speaking with second seal ring (13) that is positioned at atmospheric region (B) side on running shaft (16), and on seal casinghousing (15), second seal ring (13) can be installed axially slidably, first seal ring (22) is installed and fixed to second mechanical seal (21) then with first seal ring (22) that is positioned at atmospheric region (B) side with respect to the state that second seal ring (23) is provided with on seal casinghousing (15), and on running shaft (16) second seal ring (23) can be installed axially slidably.
5. shaft sealer as claimed in claim 1, it is characterized in that, first mechanical seal (11) installs and fixes first seal ring (12) with first seal ring (12) that is positioned at atmospheric region (B) side with respect to the state that second seal ring (13) is provided with on seal casinghousing (15), and second seal ring (13) is installed axially movably on running shaft (16), first seal ring (22) is installed and fixed to second mechanical seal (21) then with second seal ring (23) that is positioned at atmospheric region (B) side with respect to the state that first seal ring (22) is provided with on running shaft (16), and on housing (15) second seal ring (23) can be installed axially slidably.
6. one kind as any one described shaft sealer in the claim 1 to 5, it is characterized in that purge gas (G) and fluid-encapsulated pressure difference are 0.5-10kg/cm
2
7. one kind as any one described shaft sealer in the claim 1 to 5, it is characterized in that purge gas (G) and fluid-encapsulated pressure difference are 5kg/cm
2
8. one kind as any one described shaft sealer in the claim 1 to 5, it is characterized in that, washing solution (F) is injected in the contact segment of seal ring (12,13) of first mechanical seal (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93116478A CN1045330C (en) | 1993-08-25 | 1993-08-25 | A shaft seal device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93116478A CN1045330C (en) | 1993-08-25 | 1993-08-25 | A shaft seal device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1099466A CN1099466A (en) | 1995-03-01 |
| CN1045330C true CN1045330C (en) | 1999-09-29 |
Family
ID=4991584
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN93116478A Expired - Lifetime CN1045330C (en) | 1993-08-25 | 1993-08-25 | A shaft seal device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1045330C (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0800509D0 (en) * | 2008-01-11 | 2008-02-20 | Crane John Uk Ltd | Seals |
| IT1390814B1 (en) * | 2008-07-31 | 2011-10-19 | Meccanotecnica Umbra Spa | FLUID MIXER WITH ROTATING SHAFTS AND ITS SEALING GROUP. |
| US20110138963A1 (en) * | 2010-06-29 | 2011-06-16 | Pischel Klaus | Active sealing-draining device |
| CN102072322A (en) * | 2011-01-31 | 2011-05-25 | 江苏金鹰流体机械有限公司 | Combined type sealing device with double end faces |
| CN103075517A (en) * | 2013-01-16 | 2013-05-01 | 苏瑞益 | Multi-end surface combined mechanical seal |
| CN104500742A (en) * | 2014-12-06 | 2015-04-08 | 无锡高卓流体设备有限公司 | Sealing component with good stability |
| CN105090518B (en) * | 2015-09-14 | 2017-06-30 | 成都赛乐化新机电有限公司 | Bellows-type dry gas sealing device and encapsulating method |
| JP7229096B2 (en) * | 2019-05-17 | 2023-02-27 | 日本ピラー工業株式会社 | rotary joint |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3811687A (en) * | 1971-11-17 | 1974-05-21 | Klein Schanzlin & Becker Ag | Shaft seal |
-
1993
- 1993-08-25 CN CN93116478A patent/CN1045330C/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3811687A (en) * | 1971-11-17 | 1974-05-21 | Klein Schanzlin & Becker Ag | Shaft seal |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1099466A (en) | 1995-03-01 |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
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| C14 | Grant of patent or utility model | ||
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| CX01 | Expiry of patent term |
Expiration termination date: 20130825 Granted publication date: 19990929 |