CN204459137U - A kind of cryogenic engine oxidant pump sealer with assembled - Google Patents
A kind of cryogenic engine oxidant pump sealer with assembled Download PDFInfo
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- CN204459137U CN204459137U CN201420865905.0U CN201420865905U CN204459137U CN 204459137 U CN204459137 U CN 204459137U CN 201420865905 U CN201420865905 U CN 201420865905U CN 204459137 U CN204459137 U CN 204459137U
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- oxidant pump
- pin
- sealer
- seal assembly
- support ring
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Abstract
The utility model relates to a kind of mechanical seal device, and it relates generally to a kind of for cryogenic engine oxidant pump sealer with assembled.The structure of this device is: form a cavity between oxidant pump housing and oxidant pump rotating shaft; Noncontact seal assembly and contacting mechanical seal is disposed with in cavity; Wherein, noncontact seal assembly to be sleeved in oxidant pump rotating shaft and to be positioned at the entry end of oxidant pump housing for sealing wheel construction, envelope wheel; Contacting mechanical seal assembly is made up of graphite annulus, support ring, spring, bellows and fastening flange.The utility model has good seal performance under high linear speed, low temperature, condition of high voltage, reliability advantage high, applied widely.
Description
Technical field
The utility model relates to a kind of mechanical seal device, and it relates generally to a kind of for cryogenic engine oxidant pump sealer with assembled.
Background technique
At present, the mechanical seal both at home and abroad for low temperature environment mainly contains two kinds, and the first type is noncontact seal, it is characterized in that adopting labyrinth or floating ring to realize reducing pressure step by step and sealing to change media flow characteristic; The second type is contacting mechanical seal, it is characterized in that utilizing the elastic element such as spring and bellows that stationary ring and rotating ring are fitted tightly realizes sealing.The first non-contact type combined labyrinth and carbon gland has that structure is simple, work time contactless friction, advantage that reliability is high, but this structure can take larger dimensional space, there is the problem that leakage rate is large simultaneously.The second contacting mechanical seal, sealing configuration is comparatively ripe, sealing compensation and followability better, but because cryogenic media very easily to expand gasification at seal face, under higher working pressure and larger vibration environment, there is to cryogenic media the problem that leakage rate is comparatively large and end wear amount is larger in this structure, repeat performance is not good.
Model utility content
In order to solve the problem in background technique, the utility model proposes a kind of good seal performance under high linear speed, low temperature, condition of high voltage, reliability high, applied widely for motor oxidant pump sealer with assembled under worst cold case.
Concrete technological scheme of the present utility model is:
A kind of cryogenic engine oxidant pump sealer with assembled, is characterized in that: form a cavity between oxidant pump housing and oxidant pump rotating shaft; Noncontact seal assembly and contacting mechanical seal is disposed with in described cavity.
Above-mentioned noncontact seal assembly is sealing wheel construction; Described sealing wheel to be sleeved in oxidant pump rotating shaft and to be positioned at the entry end of oxidant pump housing; Described sealing wheel is fluid-tight wheel or helical wheel.
Above-mentioned contacting mechanical seal assembly comprises graphite annulus, support ring, spring, bellows and fastening flange;
Described support ring, bellows, fastening flange are sleeved in the rotating shaft of oxidant pump all successively; Described support ring, bellows, fastening flange form a spring chamber; Described spring fitting is in spring chamber; One end of described spring contacts with support ring, and the other end contacts with fastening flange; Described support ring can move axially along oxidant pump rotating shaft; Described fastening flange is fixedly mounted in oxidation pump case by screw;
Described graphite annulus is arranged between support ring and sealing wheel, and one end of graphite annulus is arranged on support ring, and the other end takes turns end contact with sealing.
Above-mentioned contacting mechanical seal assembly also comprises disengaging gear and impulse passage; Described disengaging gear comprises retaining ring, pin; The external annulus of described retaining ring is fixedly connected with the inwall of oxidant pump housing; Described fixing ring body offers pin-and-hole; Described pin is arranged in pin-and-hole and pin-and-hole and pin are Spielpassung; Described oxidant pump housing, retaining ring form an areola; Described impulse passage is offered on oxidant pump housing; Described areola and impulse channel connection.
Above-mentioned retaining ring is connected by screw thread with oxidant pump housing.
The quantity of above-mentioned pin-and-hole is multiple and is evenly distributed on retaining ring; The quantity of described pin is identical with pin-and-hole quantity.
Above-mentioned fastening flange is provided with boss; Described boss and oxidant pump inner walls fit tightly; Described boss is provided with groove; In groove, seal ring is installed; The cross section of described seal ring is in falling " V " font.
Above-mentioned noncontact seal assembly and contacting mechanical seal assembly are disposed with many groups in cavity.
The utility model has the advantage of:
1, the utility model adopts the mode that noncontact seal assembly and contacting mechanical seal assembly combine, the high pressure liquid oxygen of noncontact seal assembly to oxidant pump entrance is utilized to seal and reduce pressure, thus reduce the working pressure of contacting mechanical seal, the high pressure liquid oxygen being difficult to seal is converted into the low pressure gas oxygen being easy to seal;
2, adopt disengaging gear in contact seal assembly of the present utility model, ensure that motor leaks without liquid oxygen at precooling packing stage, during work, sealing surface is thrown off, and realizes low wearing and tearing, automatically closes during parking, can adapt to the repeatedly starting of motor.
3, contacting mechanical seal assembly of the present utility model seals the low pressure gas oxygen formed after the decompression of sealing wheel, adopts high performance graphite as friction pair material, has good frictional behavior, can ensure to be sealed in stable operation in gas oxygen environment.
4, the utility model adopts " V " font ring as auxiliary seal, not only saves space but also can prevent cryogenic media from leaking to separate cavities;
5, the sealer with assembled that the utility model adopts organizes setting more in cavity, can realize pressure-reducing function step by step, substantially increase the reliability and stability of seal arrangement.
Accompanying drawing explanation
Fig. 1 is the structure diagram of the utility model seal arrangement;
Wherein, 1-oxidant pump housing, the rotating shaft of 2-oxidant pump, 3-cavity, 4-seal wheel, 5-contacting mechanical seal assembly, 6-graphite annulus, 7-support ring, 8-spring, 9-bellows, 10-fastening flange, 11-groove, 12-seal ring, 13-boss, 14-bolt, 15-spring chamber.
Fig. 2 is the structural representation of the optimal enforcement scheme of the utility model seal arrangement.
Wherein, 16-disengaging gear, 17-retaining ring, 18-impulse passage, 19-pin, 20-pin-and-hole, 21-areola
Embodiment
The utility model proposes a kind of cryogenic engine oxidant pump sealer with assembled, the structure of composition graphs 1 to this device is described:
Sealing device is arranged in motor oxidant pump, and special way is: form a cavity 3 between this oxidant pump housing 1 and oxidant pump rotating shaft 2; Noncontact seal assembly and contacting mechanical seal 5 is disposed with in cavity 3.
Specifically, this noncontact seal assembly is sealing wheel 4; The rotating shaft 2 that sealing wheel is sleeved on oxidant pump is positioned at the entry end of oxidant pump housing 1; Sealing wheel 4 is fluid-tight wheel or helical wheel, and it act as and carries out step-down to oxidant pump entrance liquid oxygen, the high pressure liquid oxygen being difficult to seal is converted into the low pressure gas oxygen being easy to seal.
Specifically, this contacting mechanical seal assembly 5 comprises graphite annulus 6, support ring 7, spring 8, bellows 9 and fastening flange 10;
Support ring 7, bellows 9, fastening flange 10 are sleeved in oxidant pump rotating shaft 2 all successively, and support ring 7, bellows 9, fastening flange 10 form a spring chamber 15; Spring 8 is arranged in spring chamber 15; One end of spring 8 contacts with support ring 7, and the other end contacts with fastening flange 10; Support ring 7 can move axially along oxidant pump rotating shaft 2; Fastening flange 10 is fixedly mounted in oxidation pump case by screw;
Graphite annulus 6 is arranged between support ring 7 and sealing wheel 4, and an end face of graphite annulus 6 is arranged on support ring 7, other end and the contact sealing wheel 4 end face; .Its effect is, the pretightening force utilizing spring 8 to provide makes graphite annulus 6 contact with sealing wheel 4, is in closed state, realizes sealing when motor precooling, work and after shutdown.
In order to improve the service behaviour of this sealer with assembled further, the utility model also proposed the optimized project of this sealer with assembled, is described below in conjunction with accompanying drawing 1 and accompanying drawing 2 pairs of optimisation technique schemes:
The basic structure of this optimization method is consistent with said structure, and the main scheme optimized is following a few place:
During engine operation, contact seal assembly 5 is in open mode, alleviates seal face wearing and tearing; Be in contact condition after closing shutdown before engine start, turbine pump can be realized well in prestart and postboost sealing with reuse requirement.
Contacting mechanical seal assembly 5 is provided with disengaging gear 16 and impulse passage; Disengaging gear 16 comprises retaining ring 17, pin 19; The external annulus of retaining ring is fixedly connected with the inwall of oxidant pump housing; Fixing ring body offers pin-and-hole; Pin is arranged in pin-and-hole and pin-and-hole and pin are Spielpassung; General preferred fit tolerance is H8/d7.Oxidant pump housing, retaining ring form an areola; Impulse passage is offered on oxidant pump housing; Areola and impulse channel connection.
During work, after pressure is introduced areola 21 by impulse passage 18, only need very little pressure just can promote pin 19 and move to the direction of support ring 7, make graphite annulus 6 away from sealing wheel 4.
Stability stressed when moving in order to ensure support ring, in this disengaging gear, the quantity of pin-and-hole 20 is multiple and is evenly distributed on retaining ring 17; And the quantity of pin 19 is identical with pin-and-hole 20.
Specialization also has: fastening flange 10 is provided with boss 13; Boss 13 and oxidant pump housing 1 inwall fit tightly; On boss, 13 are provided with groove 11; Seal ring 12 is installed in groove 11; The cross section of seal ring is in falling " V " font.Utilize this seal ring as auxiliary seal, further improve sealing effect.
It should be noted that: sealing wheel 4 and graphite annulus 6 select steel S-07 to have good frictional behavior to high performance graphite as friction pair pairing material, can ensure to be sealed in stable operation in gas oxygen environment herein; Impulse passage 18 be opened in oxidation pump housing 1 on or in oxidant pump rotating shaft 2; Seal ring 12 selects steel S-07 material as matrix, it sprays F3, can realize the reliable sealing to 5MPa liquid oxygen.
In the working procedure of reality, the liquid oxygen pressure of oxidant pump may be larger, therefore, noncontact seal assembly and contacting mechanical seal assembly is needed to be arranged alternately many groups in cavity, thus guarantee to realize reducing pressure step by step to liquid oxygen and sealing, for motor provides good working environment.
Claims (8)
1. a cryogenic engine oxidant pump sealer with assembled, is characterized in that: form a cavity between oxidant pump housing and oxidant pump rotating shaft; Noncontact seal assembly and contacting mechanical seal is disposed with in described cavity.
2. cryogenic engine oxidant pump sealer with assembled according to claim 1, is characterized in that: described noncontact seal assembly is sealing wheel construction; Described sealing wheel to be sleeved in oxidant pump rotating shaft and to be positioned at the entry end of oxidant pump housing; Described sealing wheel is fluid-tight wheel or helical wheel.
3. cryogenic engine oxidant pump sealer with assembled according to claim 1 and 2, is characterized in that: described contacting mechanical seal assembly comprises graphite annulus, support ring, spring, bellows and fastening flange;
Described support ring, bellows, fastening flange are sleeved in the rotating shaft of oxidant pump all successively; Described support ring, bellows, fastening flange form a spring chamber; Described spring fitting is in spring chamber; One end of described spring contacts with support ring, and the other end contacts with fastening flange; Described support ring can move axially along oxidant pump rotating shaft; Described fastening flange is fixedly mounted in oxidation pump case by screw;
Described graphite annulus is arranged between support ring and sealing wheel, and one end of graphite annulus is arranged on support ring, and the other end takes turns end contact with sealing.
4. cryogenic engine oxidant pump sealer with assembled according to claim 3, is characterized in that: described contacting mechanical seal assembly also comprises disengaging gear and impulse passage; Described disengaging gear comprises retaining ring, pin; The external annulus of described retaining ring is fixedly connected with the inwall of oxidant pump housing; Described fixing ring body offers pin-and-hole; Described pin is arranged in pin-and-hole and pin-and-hole and pin are Spielpassung; Described oxidant pump housing, retaining ring form an areola; Described impulse passage is offered on oxidant pump housing; Described areola and impulse channel connection.
5. cryogenic engine oxidant pump sealer with assembled according to claim 4, is characterized in that: described retaining ring is connected by screw thread with oxidant pump housing.
6. cryogenic engine oxidant pump sealer with assembled according to claim 5, is characterized in that: the quantity of described pin-and-hole is multiple and is evenly distributed on retaining ring; The quantity of described pin is identical with pin-and-hole quantity.
7. cryogenic engine oxidant pump sealer with assembled according to claim 6, is characterized in that: described fastening flange is provided with boss; Described boss and oxidant pump inner walls fit tightly; Described boss is provided with groove; In groove, seal ring is installed; The cross section of described seal ring is in falling " V " font.
8. cryogenic engine oxidant pump sealer with assembled according to claim 7, is characterized in that: described noncontact seal assembly and contacting mechanical seal assembly are disposed with many groups in cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420865905.0U CN204459137U (en) | 2014-12-30 | 2014-12-30 | A kind of cryogenic engine oxidant pump sealer with assembled |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420865905.0U CN204459137U (en) | 2014-12-30 | 2014-12-30 | A kind of cryogenic engine oxidant pump sealer with assembled |
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| Publication Number | Publication Date |
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| CN204459137U true CN204459137U (en) | 2015-07-08 |
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| CN201420865905.0U Active CN204459137U (en) | 2014-12-30 | 2014-12-30 | A kind of cryogenic engine oxidant pump sealer with assembled |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104565363A (en) * | 2014-12-30 | 2015-04-29 | 中国航天科技集团公司第六研究院第十一研究所 | Combined type sealing device for low-temperature engine oxidizing agent |
-
2014
- 2014-12-30 CN CN201420865905.0U patent/CN204459137U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104565363A (en) * | 2014-12-30 | 2015-04-29 | 中国航天科技集团公司第六研究院第十一研究所 | Combined type sealing device for low-temperature engine oxidizing agent |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |