CN205639619U - Combined sealing device for liquid oxygen pump - Google Patents
Combined sealing device for liquid oxygen pump Download PDFInfo
- Publication number
- CN205639619U CN205639619U CN201521030755.2U CN201521030755U CN205639619U CN 205639619 U CN205639619 U CN 205639619U CN 201521030755 U CN201521030755 U CN 201521030755U CN 205639619 U CN205639619 U CN 205639619U
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- CN
- China
- Prior art keywords
- seals
- seal
- grades
- liquid oxygen
- dry gas
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
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Abstract
The utility model discloses a combined sealing device for liquid oxygen pump, include that three kinds of non -contact of tandem arrangement are sealed in proper order, be one -level centrifugal seal, sealed, the tertiary float ring seal of second grade dry gas respectively. One -level centrifugal seal's blade and the sealed dynamic pressure groove syntropy of second grade dry gas are arranged, and the liquid oxygen pump enters the mouth dorsad. The second grade dry gas is sealed, form sealed chamber between tertiary float ring seal and the seal shell to be provided with fluid passage on seal shell, be provided with fluid passage on the tertiary float ring seal. This sealing device has solved present liquid oxygen pump seal face wear out failure well or has let out the problem that leakage quantity is big to have life -span height, characteristics that the reliability is high.
Description
Technical field
This utility model relates to fluid seal apparatus technical field, it is adaptable to liquid oxygen pump inlet seal, particularly the inlet seal of liquid-propellant rocket engine liquid oxygen pump.
Background technology
Liquid oxygen pump is as the important component part of liquid-propellant rocket engine, the low-temperature liquid oxygen that its effect is required when being conveying electromotor work, owing to liquid oxygen pump is usually operated under high rotating speed, in addition liquid oxygen easily vaporizes, bring high challenge therefore to the Seal Design of liquid oxygen pump, currently mainly there are two kinds of seal form: a kind of for arrange disengagement type mechanical seal at liquid oxygen pump entrance, during electromotor work, seal face is in disengaged condition, it is millimeter magnitude that this kind seals owing to sealing disengagement gap, therefore can cause a large amount of dielectric leakage, reduce the work efficiency of liquid oxygen pump；Another kind of for arrange contact type mechanical at liquid oxygen pump entrance, during electromotor work, seal face is in closure state, and this kind seals due to seal face high-speed friction, therefore can cause friction pair heavy wear, sealing leak amount is increased dramatically, and affects working life and the reusability of electromotor.
Understanding based on above, the most existing liquid oxygen pump Sealing Technology has that leakage rate is big or the shortcoming of friction pair heavy wear.
Summary of the invention
For overcoming the deficiency of above-mentioned Sealing Technology, a kind of leakage rate of this utility model offer is little, seal face friction free sealer with assembled.
Concrete technical scheme of the present utility model is as follows:
Liquid oxygen pump sealer with assembled provided by the utility model, it is characterized in that and includes that first-stage centrifugal seals I and two grades of dry gas seals II, and described first-stage centrifugal seals I and two grades of dry gas seals II are sequentially connected in series in the rotating shaft being arranged in liquid oxygen pump porch,
Described first-stage centrifugal seals and is provided with blade 1 ' on I, and described blade 1 ' liquid oxygen pump entrance dorsad is arranged,
Having seal clearance H between the blade 1 ' of described two grades of dry gas seals II and first-stage centrifugal sealing I, the annular seal space of described seal clearance H and two grades of dry gas seals II communicates,
When liquid oxygen pump rotates, described first-stage centrifugal seals I and seals most liquid oxygen, and a small amount of liquid oxygen that will leak out becomes gas oxygen, entering the annular seal space of two grades of dry gas seals II after described gas oxygen sealed gap H, the sealing source of the gas as two grades of dry gas seals II makes two grades of dry gas seals II noncontact operatings；
When liquid oxygen pump is static, described two grades of dry gas seals II are as the leakage of contact seal barrier liquid.
Being more than Basic architecture of the present utility model, based on this basic structure, this utility model is also made following optimization and is limited:
For using liquid oxygen as the liquid-propellant rocket engine of oxidant, propellant is in addition to the liquid oxygen that liquid oxygen pump carries, also need to another kind of medium as fuel (such as kerosene), fuel is to be carried by petrolift, petrolift is generally and liquid oxygen pump is coaxially arranged, during electromotor work, two media can not be gone here and there chamber, be contacted with each other.This utility model also sets up three grades of float ring seal III after two grades of dry gas seals II, after described three grades of float ring seals (III) are connected on two grades of dry gas seals (II), the gas oxygen from two grades of dry gas seals II leakages can be stoped further to leak cause A chamber (such as fuel pump inlet) vertically, prevent gas oxygen from contacting with medium A (such as kerosene).
Further, this utility model liquid oxygen pump sealer with assembled also includes seal casinghousing 3, described two grades of dry gas seals II, between three grades of float ring seal III and seal casinghousing 3 formed annular seal space, and it is provided with fluid passage 3 ' on seal casinghousing 3, three grades of float ring seal III are provided with fluid passage 6 '.Can release from fluid passage 3 ' (being typically discharged into external environment) from most of gas oxygen of two grades of dry gas seals II leakages；When the gas oxygen allowing leakage contacts with the medium A in A chamber, and what the fluid passage 6 ' of three grades of float ring seal III can be further used as gas oxygen releases passage；When the gas oxygen not allowing leakage contacts with the medium A in A chamber, the fluid passage 6 ' of three grades of float ring seal III can be as the entrance of resistance envelope gas (nitrogen or air etc.), and the resistance being passed through envelope gas can stop gas oxygen to leak cause A chamber vertically completely.
Further, two grades of dry gas seals II of the present utility model include that rotating ring 2 and static components, described static components include graphite annulus 11, auxiliary seal 10, elastic parts 9, stationary seat 8, gland 5 and locking plate 4；
Described rotating ring 2 is oppositely arranged and is arranged on graphite annulus 11 in rotating shaft, and the rotating ring 2 of described two grades of dry gas seals II is machined with dynamic pressure groove 2 ', and described graphite annulus 11 floating mount is inside stationary seat 8, and auxiliary seal 10 is arranged between graphite annulus 11 and elastic parts 9；
Described stationary seat 8 relies on being connected with seal casinghousing 3 of gland 5, is provided with locking plate 4 between stationary seat 8 and gland 5.
Further, rotating ring 2 of the present utility model seals I near first-stage centrifugal, rotating ring 2 is inserted in one end of described seal casinghousing 3 and first-stage centrifugal seals between I, described seal casinghousing 3 and first-stage centrifugal seal between the blade 1 ' of I shape seal clearance H, also have, between described seal casinghousing 3 and rotating ring 2, the gas passage being connected with seal clearance H.
Further, the rotating ring 2 of this utility model first-stage centrifugal sealing I and two grades of dry gas seals II relies on axle sleeve 7 to compress installation；
Being provided with the first static seal 12 between described axle sleeve 7 and rotating ring 2, described first-stage centrifugal seals and is provided with the second static seal 13 between I and the rotating ring 2 of two grades of dry gas seals II.
Further, owing to the sealability of first-stage centrifugal sealing I is relevant with the radial dimension of blade 1 ', the radial dimension of blade 1 ' is the biggest, sealability is the strongest, the internal diameter of blade 1 ' of the present utility model is smaller than the external diameter of the rotating ring 2 of two grades of dry gas seals II, therefore the blade 1 ' of first-stage centrifugal sealing I can make full use of radial space, improves sealability.
Further, elastic parts 9 of the present utility model is welded metal bellow.Welded metal bellow has elasticity stable, compensatory good advantage.
Further, auxiliary seal 10 of the present utility model is spring energy-storage sealing ring.
Common rubber seal can not be applied at cryogenic oxygen environment, and spring energy-storage sealing ring of the present utility model has the sealing of excellence at low ambient temperatures.
Operation principle of the present utility model is: during liquid oxygen pump operating, and first-stage centrifugal seals I can seal most liquid oxygen, and a small amount of liquid oxygen of leakage translates into gas oxygen；The gas oxygen being sealed I leakage by first-stage centrifugal can be as the source of the gas of two grades of dry gas seals II so that it is noncontact operates；To be sealed by three grades of float ring seal III by few gas oxygen of two grades of dry gas seals II leakages, major part gas oxygen will release from fluid passage 3 '.Leakage rate according to two grades of dry gas seals II or be actually needed, the fluid passage 6 ' of three grades of float ring seal III can release passage as gas oxygen or resistance envelope gas (such as nitrogen or air) enters passage；When liquid oxygen pump is static, two grades of dry gas seals II are as the leakage of contact seal barrier liquid.
Compared with prior art, advantage is this utility model:
1. the three kinds of sealings comprised due to combined labyrinth and carbon gland are non-contacting seal, thus are not limited by liquid oxygen pump spindle speed, and are capable of seal face zero abrasion, long time running, repeatedly start and stop.
2. owing to combined labyrinth and carbon gland introducing dry gas seals, so this utility model has the advantages that leakage rate is few.
3. need not out-source gas due to the dry gas seals in combined labyrinth and carbon gland, so this utility model has the feature of simple in construction, due to graphite annulus 11 floating mount, so having axial and that angular compensatory is good advantage.
4. less than the external diameter of dry gas seals rotating ring, thus can at utmost utilize the radial space of centrifugal seal due to the internal diameter blade of the centrifugal seal in combined labyrinth and carbon gland.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of the present utility model.
Fig. 2 is a kind of centrifugal seal blade construction of the present utility model.
Fig. 3 is a kind of dry gas seals dynamic pressure groove structure of the present utility model.
In figure: I-first-stage centrifugal seals；Bis-grades of dry gas seals of II-；Tri-grades of float ring seals of III-；1 '-blade；2-rotating ring；2 '-dynamic pressure groove；3-seal casinghousing；3 '-fluid passage；4-locking plate；5-gland；6 '-fluid passage；7-axle sleeve；8-stationary seat；9-elastic parts；10-auxiliary seal；11-graphite annulus；12-the first static seal；13-the second static seal, 14-the 3rd static seal；H-seal clearance.
Detailed description of the invention
Below in conjunction with the detailed description of the invention shown in accompanying drawing 1～3, foregoing of the present utility model is described in further detail again.But this should not being interpreted as, the scope of the above-mentioned theme of this utility model is limited only to Examples below.In the case of without departing from the above-mentioned technological thought of this utility model, the various replacements made according to ordinary skill knowledge and customary means or change, all should be included in the range of this utility model.
As it is shown in figure 1, a kind of liquid oxygen pump sealer with assembled of the present utility model, it is included in liquid oxygen pump entrance and is sequentially connected in series three kinds of non-contacting seals of layout, respectively first-stage centrifugal sealing I, two grades of dry gas seals II, three grades of float ring seal III.
First-stage centrifugal seals and is machined with blade 1 ' on I, and Fig. 2 is a kind of centrifugal seal blade construction, and for wide linear blade, circumference is uniformly distributed.
Two grades of dry gas seals II include rotating ring 2, graphite annulus 11, auxiliary seal 10, elastic parts 9, stationary seat 8, gland 5, locking plate 4.Wherein being machined with dynamic pressure groove 2 ' on rotating ring 2, Fig. 3 is a kind of dynamic pressure groove structure, and for helix dynamic pressure groove, circumference is uniformly distributed.
Graphite annulus 11 floating mount of two grades of dry gas seals II is inside stationary seat 8, and auxiliary seal 10 is arranged between graphite annulus 11 and elastic parts 9.Stationary seat 8 relies on being threaded on seal casinghousing 3 of gland 5, is provided with locking plate 4 between stationary seat 8 and gland 5, prevents gland from loosening.The elastic parts 9 herein used is welded metal bellow, and auxiliary seal 10 is spring energy-storage sealing ring.
The dynamic pressure groove 2 ' of blade 1 ' and two grades of dry gas seals II that first-stage centrifugal seals I is arranged in the same direction, and liquid oxygen pump entrance dorsad.Forming seal clearance H between blade 1 ' and the seal casinghousing 3 of first-stage centrifugal sealing I, the internal diameter of blade 1 ', less than the external diameter of two grades of dry gas seals II rotating rings 2, at utmost make use of the radial space of centrifugal seal.First-stage centrifugal seals the rotating ring 2 of I and two grades of dry gas seals II and relies on axle sleeve 7 to compress installation, and is disposed with the 3rd static seal the 14, second static seal 13 and the first static seal 12 on first-stage centrifugal sealing I, the rotating ring 2 of two grades of dry gas seals II and axle sleeve 7.
Three grades of float ring seal III are arranged on seal casinghousing 3, and internal diameter coordinates with axle sleeve 7, and form annular seal space between two grades of dry gas seals II.Seal casinghousing 3 is provided with fluid passage 3 ', three grades of float ring seal III are provided with fluid passage 6 '.
In actual work process, according to liquid oxygen pump inlet pressure, adjust first-stage centrifugal and seal the sealability of I.Leakage rate according to two grades of dry gas seals II or be actually needed, passage can be released as gas oxygen in the fluid passage 6 ' of three grades of float ring seal III, or resistance envelope gas (such as nitrogen or air) enters passage.
Claims (9)
1. a liquid oxygen pump sealer with assembled, it is characterized in that: include that first-stage centrifugal seals (I) and two grades of dry gas seals (II), described first-stage centrifugal seals (I) and two grades of dry gas seals (II) are sequentially connected in series in the rotating shaft being arranged in liquid oxygen pump porch
Described first-stage centrifugal seals and is provided with blade (1 ') on (I), and described blade (1 ') liquid oxygen pump entrance dorsad is arranged,
Between the blade (1 ') of described two grades of dry gas seals (II) and first-stage centrifugal sealing (I), there is seal clearance (H), described seal clearance (H) communicates with the annular seal space of two grades of dry gas seals (II)
When liquid oxygen pump rotates, described first-stage centrifugal seals (I) and seals most liquid oxygen, and a small amount of liquid oxygen that will leak out becomes gas oxygen, the described sealed gap of gas oxygen (H) enters the annular seal space of two grades of dry gas seals (II) afterwards, and the sealing source of the gas as two grades of dry gas seals (II) makes two grades of dry gas seals (II) noncontact operatings；
When liquid oxygen pump is static, described two grades of dry gas seals (II) are as the leakage of contact seal barrier liquid.
Liquid oxygen pump sealer with assembled the most according to claim 1, it is characterized in that: described liquid oxygen pump sealer with assembled also includes three grades of float ring seals (III), after described three grades of float ring seals (III) are connected on two grades of dry gas seals (II).
Liquid oxygen pump sealer with assembled the most according to claim 2, it is characterized in that: described liquid oxygen pump sealer with assembled also includes seal casinghousing (3), described two grades of dry gas seals (II), between three grades of float ring seals (III) and seal casinghousing (3) formed annular seal space, and on seal casinghousing (3), it is provided with fluid passage (3 '), three grades of float ring seals (III) are provided with fluid passage (6 ').
Liquid oxygen pump sealer with assembled the most according to claim 3, it is characterized in that: described two grades of dry gas seals (II) include rotating ring (2) and static components, and described static components includes graphite annulus (11), auxiliary seal (10), elastic parts (9), stationary seat (8), gland (5) and locking plate (4)；
Described rotating ring (2) and graphite annulus (11) are oppositely arranged and are arranged in rotating shaft, it is machined with dynamic pressure groove (2 ') on the rotating ring (2) of described two grades of dry gas seals (II), described graphite annulus (11) floating mount is in stationary seat (8) the inside, and described auxiliary seal (10) is arranged between graphite annulus (11) and elastic parts (9)；
Described stationary seat (8) relies on being connected with seal casinghousing (3) of gland (5), is provided with locking plate (4) between stationary seat (8) and gland (5).
Liquid oxygen pump sealer with assembled the most according to claim 4, it is characterized in that: described rotating ring (2) seals (I) near first-stage centrifugal, rotating ring (2) is inserted in one end of described seal casinghousing (3) and first-stage centrifugal seals between (I), described seal casinghousing (3) and first-stage centrifugal seal between the blade (1 ') of (I) shape seal clearance (H), also have the gas passage being connected with seal clearance (H) between described seal casinghousing (3) with rotating ring (2).
Liquid oxygen pump sealer with assembled the most according to claim 5, it is characterised in that: described first-stage centrifugal seals the rotating ring (2) of (I) and two grades of dry gas seals (II) and relies on axle sleeve (7) to compress installation；
Being provided with the first static seal (12) between described axle sleeve (7) and rotating ring (2), described first-stage centrifugal seals and is provided with the second static seal (13) between (I) and the rotating ring (2) of two grades of dry gas seals (II).
7. according to the liquid oxygen pump sealer with assembled described in claim 1 or 2 or 3 or 4 or 5 or 6, it is characterised in that: described first-stage centrifugal seals the internal diameter external diameter less than the rotating ring (2) of two grades of dry gas seals (II) of the blade (1 ') of (I).
Liquid oxygen pump sealer with assembled the most according to claim 4, it is characterised in that: described elastic parts (9) is welded metal bellow.
Liquid oxygen pump sealer with assembled the most according to claim 8, it is characterised in that: described auxiliary seal (10) is spring energy-storage sealing ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521030755.2U CN205639619U (en) | 2015-12-10 | 2015-12-10 | Combined sealing device for liquid oxygen pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521030755.2U CN205639619U (en) | 2015-12-10 | 2015-12-10 | Combined sealing device for liquid oxygen pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205639619U true CN205639619U (en) | 2016-10-12 |
Family
ID=57079201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521030755.2U Withdrawn - After Issue CN205639619U (en) | 2015-12-10 | 2015-12-10 | Combined sealing device for liquid oxygen pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205639619U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106678369A (en) * | 2017-01-18 | 2017-05-17 | 昆明理工大学 | Pumping-type dry gas seal structure with divergent-type sealing clearance |
| CN105422863B (en) * | 2015-12-10 | 2017-09-08 | 西安航天动力研究所 | A kind of liquid oxygen pump sealer with assembled |
-
2015
- 2015-12-10 CN CN201521030755.2U patent/CN205639619U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105422863B (en) * | 2015-12-10 | 2017-09-08 | 西安航天动力研究所 | A kind of liquid oxygen pump sealer with assembled |
| CN106678369A (en) * | 2017-01-18 | 2017-05-17 | 昆明理工大学 | Pumping-type dry gas seal structure with divergent-type sealing clearance |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20161012 Effective date of abandoning: 20170908 |