CN201633233U - Rotary sealing structure of medium and high pressure machine - Google Patents
Rotary sealing structure of medium and high pressure machine Download PDFInfo
- Publication number
- CN201633233U CN201633233U CN2010201327234U CN201020132723U CN201633233U CN 201633233 U CN201633233 U CN 201633233U CN 2010201327234 U CN2010201327234 U CN 2010201327234U CN 201020132723 U CN201020132723 U CN 201020132723U CN 201633233 U CN201633233 U CN 201633233U
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- rotor
- spiral
- lip
- suction side
- sealing
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Abstract
The utility model relates to a rotary sealing structure of a medium and high pressure machine, which comprises a spiral male rotor and a spiral female rotor which are radially and axially fixed by a bearing support and a suction bearing respectively; and transmission torque inputted at the shaft end of the spiral male rotor drives the spiral female rotor to rotate at a high speed in a cavity to generate a clearance lubrication seal and is corresponding to the discharge of pressure gas through the reduction of intertooth sealing volume between the spiral male rotor and the spiral female rotor. The rotary sealing structure also comprises a suction side isolation base; the suction side isolation base is respectively placed on the sides of the spiral male rotor and the spiral female rotor through a positioning pin and a locking bolt at two ends of the suction side isolation base; a PT lip seal assembled and disassembled by an ejecting screw is formed on the suction side isolation base; a bush is thermally sleeved at the sealing shaft end of the spiral male rotor in an interference manner; and the effective sealing of gas and liquid is realized by high-speed rotation of a wear resistant sealing surface of the PT lip seal and a bush. The rotary sealing structure has the advantages of long service life and can adapt to extremely bad working conditions.
Description
Technical field
The utility model relates to a kind of Intermediate High Pressure machine, relates in particular to the novel sealing structure of this Intermediate High Pressure machine.
Background technology
On the Intermediate High Pressure machine, generally adopt structures such as rubber seal and mechanical seal ring, ring-like ring, metallic framework spring in the prior art.
But the drawback of said structure is: the cost height, and one annual two to three times is changed during use, and maintenance is frequent, and very easily burn into washes away, oozes, drips, phenomenon such as leakage causes that power consumption height, oil consumption height, liner wear, unit catch fire, machine room pollution etc.; Brought thus expensive, consuming time, take a lot of work, practical problem such as stopping production, perplexing enterprise and production station technology operating personnel for a long time.
Summary of the invention
The utility model technical issues that need to address have provided a kind of Intermediate High Pressure machine rotary sealing structure, are intended to address the above problem.
In order to solve the problems of the technologies described above, the utility model is achieved through the following technical solutions:
The utility model comprises: tap rotor and rifle nut rotor respectively by bearing spider and air-breathing bearing radially with axial restraint; Described tap rotor axle head input driving torque drives the high speed rotation of rifle nut rotor in cavity and produces a gap lubrication and seal, and the between cog sealed volume by tap rotor and rifle nut rotor dwindle with the discharging of pressed gas corresponding; Also comprise: a suction side isolation seat; The described suction side isolation seat alignment pin by its two end and clamping screw respectively is placed in by the side of tap rotor and rifle nut rotor; Comprise that on described suction side isolation seat one is carried out the PT lip packing of assembly and disassembly by ejecting spiral, lining interference hot jacket is at the sealing axle head of tap rotor; The high speed of the wear-resistant seal face by described PT lip packing and lining is rotated the effective sealing that realizes gas and liquid.
Compared with prior art, the beneficial effects of the utility model are: high pressure resistant, high temperature resistant, wear-resisting, acidproof, alkaline-resisting, corrosion-resistant, flexibility is good, life cycle is long, comprehensive cost is low, novel structure, material environment friendly, good reliability is a kind of high-efficient energy-saving environment friendly product; This product result of use under adverse circumstances is particularly outstanding, as high dust, high temperature, high pressure, high rotating speed etc.; Also remedied simultaneously the harsh requirement of its axiality, hardness, circularity, fineness etc. to driving shaft.
Description of drawings
Fig. 1 is the utility model structural representation;
Fig. 2 is the decomposition chart of PT lip packing among Fig. 1;
Fig. 3 is a limit PV theoretical diagram.
The specific embodiment
By Fig. 1, Fig. 2 as seen: the utility model comprises: tap rotor 10 and rifle nut rotor 1 respectively by bearing spider 2 and air-breathing bearing 5 radially with axial restraint; Described tap rotor 10 axle heads input driving torque drives the high speed rotation of rifle nut rotor 1 in cavity and produces a gap lubrication and seal, and the between cog sealed volume by tap rotor 10 and rifle nut rotor 1 dwindle with the discharging of pressed gas corresponding; Also comprise: a suction side isolation seat 4; Described suction side isolation seat 4 alignment pin 9 by its two end and clamping screw 3 respectively is placed in by the side of tap rotor 10 and rifle nut rotor 1; Comprise that on described suction side isolation seat 4 one is carried out the sealing axle head of 6, one linings of PT lip packing, the 7 interference hot jackets of assembly and disassembly at tap rotor 10 by ejecting spiral 8; Rotate the effective sealing that realizes gas and liquid by the described PT lip packing 6 and the high speed of the wear-resistant seal face of lining 7;
Described PT lip packing 6 comprises: the metal shell 11 of air side and the metal inner casing 13 of oily side; Described metal shell 11 is connected with the other pad 17 of side with the gasket ring 12 of metal inner casing 13 by its upside; Comprise a PT lip 14 and the auxiliary dust excluder lips 16 by PT lip 14 sides in the lower end of metal inner casing 13; A support frame 15 is between PT lip 14 and auxiliary dust excluder lips 16.
The concrete outstanding performance on forcing press uses of PT lip rollback rotary sealing in the utility model gathers as follows:
1, helps to reduce the energy resource consumption of equipment;
2, maximum speed can reach 9000r/min;
3, operating temperature range widely is from-50 ℃ to 200 ℃;
4, provide the model that is applicable to dried running and softer ground rotating shaft to select;
5, have and satisfy the groove model of various Different Diameter to oil sealing;
6, permanent shelf life does not have special memory requirement;
7, the long-term low anti-stick cunning of back negative pressure breakaway force of shutting down;
8, the anti-chemistry of brilliance of opposing corrosive medium;
9, be suitable for hanging down the working environment of lubricated and moment oil-free lubrication.
Theoretical material of the present utility model is according to being: have the encapsulant of oily mesohigh rotation pressure machine rotary sealing structure all to adopt high-performance compound PT to fill, and selecting optimized sealing property to handle under the sealed environment widely.Because this will have low-friction material just can bear higher PV value (pressure X speed), the product of P (unit pressure MPa) and speed V (m/s), the limit PV value of PT compound in continuous gyration can be along with factors such as the improvement of temperature and design and increased, design the service life of sealing ring in design according to instructions for use, counter afterwards required moment of torsion that provides and the wear-out life calculated.The temperature cause along with progressively increasing of friction rises, and can make PV value reach maximum or is called limit PV value, and it concerns as Fig. 3.
The utility model adopts in forcing press is used, and this kind sealing has integrated fluid dynamic pressure backrush characteristic, and it is thick that the PT lip rollback sealing lip of this kind form is generally 1mm, and touches with being coupling in the axial direction, and width is 2-3mm.In the manufacturing, adopt multiple working procedure technology,, axially upward process the single head spiral is cut the into radial end face of P pipe, will seal as packing ring then and downcut and on a mandrel, push through Digit Control Machine Tool at first with PT material injection P pipe.What place the fine finishining metal shell is that the potted component of base material is formed with PT to rotary sealing by two.When inner base material provides good dynamic seal (packing) for the axle surface of at a high speed rotation, when making it show splendid performance, outside metal lining then provides powerful static seal power by leaning on trench wall, thereby prevents thermal cycle.The characteristic that its low friction and nothing are creeped can reduce caloric value, allows higher peripheral speed and reduces energy consumption.Above performance has guaranteed that this product has long service life, farthest prolongs the Mean Time Between Replacement of periodic maintenance and increases productivity.When mounted, the spiral engagement shaft, and form a cone-type spiral in the groove side.The axle of rotation is just as in a helixseal, and liquid is pumped into the oily side of sealing, therefore, is merely able to seal on a direction of rotation.Although extend spirally the end of axle sleeve, sealing is that static state is not leaked.Its principle is that contact pressure is near terminal helicla flute; the bead axial clamp of PT lip is held between can and the elastomeric pad; helicla flute has high relatively pumping rate; and air pump delivered to oily space; therefore at least under high axle rotating speed, must protect the PT lip-type seal to avoid external liquid and from the dust intrusion of air side.Therefore the sealing shown in Fig. 2 has the auxiliary dust excluder lips 16 of an elasticity.PT lip packing design usually produces 0.1-0.3N/mm down at 80 degrees centigrade
2Initial radial load, it is greater than the initial load of elastomer lip packing.Different thermal expansions makes the reverse minimizing of radial load 50%-70% under 120-150 degree centigrade running temperature.In addition, the operation of the extended period under temperature range makes load irreversibly reduce 20%-40%.The actual measurement coefficient of friction is in the f=0.2-0.3 scope.The frictional force of PT lip packing is average approximately identical with the elastomer lip packing, but the heat of unit are is lower, because frictional heat produces on bigger interface.For example, for the sealing of the 80mm diameter under the 5500r/min rotating speed, according to oily gentle running time, recording average torque is 0.3-0.5Nm.This causes the power loss of 180-280W, but the 3.35W/mm of heat density on the interface and corresponding elastomer lip packing
2Comparing, only is 0.28-0.42W/mm
2
Show according to testing experiment: PT lip low frictional properties, help to reduce energy loss and frictional heat, unique self-lubricating fluid power characteristic can further be reduced friction.Although it has higher rigidity, these PT lip packing will be accepted the static state of 0.3mm at least and dynamic radial eccentricity and leak increase to be not aware of.This is the high result who returns pump capacity of spiral fluted, and approximates the eccentricity of the elastomer lip packing with one-way spiral pumping installations.
Especially high axle rotating speed and high oil temperature must be considered another adverse effect down.The rollback screw thread not only makes oily loopback, also a large amount of air is passed through the seal clearance pumping simultaneously.This can strengthen the sedimental formation of interface oxidation from the lubricating oil of degenerating.These deposits can stop up the rollback helicla flute and cause the dynamic seal (packing) mechanism collapse.Extended test has shown at random and has stopped-changeed leakage, and the interim obstruction of hypothesis dynamic seal (packing) mechanism is a main cause.Similarly effect can occur in also that external contaminant enters and the plug for seal structure time.Therefore, in the PT lip packing, the dust discharge of air side is important.
The material and the hardness of axle: cast iron or hardened steel 45～55HRC, axle head chamfering;
The material in hole: other common metal material or nonmetallic materials such as cast iron, steel, aluminium;
The fineness 0.8um of axle, tolerance h11;
Fineness 0.8～the 1.6um in hole, tolerance H8;
The metal shell characteristic:
1. under harsh environment, has durability;
2. effective external diameter static sealing;
3. heat resistanceheat resistant cyclicity;
3. high-quality metal material range of choice comprises stainless steel, aluminium and other special-purpose metals such as titanium;
4. high chemical corrosion resistance;
5. the superhigh precision surface grinding is handled, and can improve the sealing of Static Contact face;
Do the viewpoint of service ability from positive use experience, user's long-time running feedback and PT materials chemistry heat endurance and moment, in conjunction with simple and practical sealing principle, novel PT double-lipped rotary sealing structure relies on its superior reliability and long-life finding more Economic Application field in the future.
Claims (2)
1. Intermediate High Pressure machine rotary sealing structure comprises: tap rotor and rifle nut rotor respectively by bearing spider and air-breathing bearing radially with axial restraint; Described tap rotor axle head input driving torque drives the high speed rotation of rifle nut rotor in cavity and produces a gap lubrication and seal, and the between cog sealed volume by tap rotor and rifle nut rotor dwindle with the discharging of pressed gas corresponding; It is characterized in that also comprising: a suction side isolation seat; The described suction side isolation seat alignment pin by its two end and clamping screw respectively is placed in by the side of tap rotor and rifle nut rotor; Comprise that on described suction side isolation seat one is carried out the PT lip packing of assembly and disassembly by ejecting spiral, lining interference hot jacket is at the sealing axle head of tap rotor; The high speed of the wear-resistant seal face by described PT lip packing and lining is rotated the effective sealing that realizes gas and liquid.
2. Intermediate High Pressure machine rotary sealing structure according to claim 1, it is characterized in that: described PT lip packing comprises: the metal inner casing of the metal shell of air side and oily side; Described metal shell is connected with the other pad of side with the gasket ring of metal inner casing by its upside; Comprise a PT lip and the auxiliary dust excluder lips by PT lip side in the lower end of metal inner casing; A support frame is between PT lip and auxiliary dust excluder lips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201327234U CN201633233U (en) | 2010-03-16 | 2010-03-16 | Rotary sealing structure of medium and high pressure machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201327234U CN201633233U (en) | 2010-03-16 | 2010-03-16 | Rotary sealing structure of medium and high pressure machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201633233U true CN201633233U (en) | 2010-11-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201327234U Expired - Fee Related CN201633233U (en) | 2010-03-16 | 2010-03-16 | Rotary sealing structure of medium and high pressure machine |
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| Country | Link |
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| CN (1) | CN201633233U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108915787A (en) * | 2018-08-09 | 2018-11-30 | 中国船舶重工集团公司第七0三研究所 | A kind of steam turbine helixseal structure |
-
2010
- 2010-03-16 CN CN2010201327234U patent/CN201633233U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108915787A (en) * | 2018-08-09 | 2018-11-30 | 中国船舶重工集团公司第七0三研究所 | A kind of steam turbine helixseal structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101117 Termination date: 20170316 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |