CN1092140A - Sealing movable ring with combined braze-welded structure - Google Patents
Sealing movable ring with combined braze-welded structure Download PDFInfo
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- CN1092140A CN1092140A CN 93102191 CN93102191A CN1092140A CN 1092140 A CN1092140 A CN 1092140A CN 93102191 CN93102191 CN 93102191 CN 93102191 A CN93102191 A CN 93102191A CN 1092140 A CN1092140 A CN 1092140A
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- ring
- carbide
- steel substrate
- cemented carbide
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Abstract
Present domestic petrochemical industry adopts the spring mechanical seal for pump, compares with the foreign same type product and differs 5 times its working life approximately.The present invention is for overcoming the defective of old-fashioned sealing, adopt the Cutanit working surface with steel substrate soldering composite structure, working surface hardness reaches more than the HRA92, resistance to flexure is greater than 1400MPa, good with the coupling of the heat expansion number between the steel substrate, avoided the high temperature deformation leakage, in anti-inorganic salts or hydrogen sulfide corrosion below 400 ℃, with base material in conjunction with tensile strength greater than 200MPa.
Description
The invention relates to machinery seal method, it is characterized in that adopting containing Himet-steel substrate sealing movable ring with combined braze-welded structure.The invention belongs to the mechanical parts field of sealing technology.
At present, domestic centrifugal pump and the reactor mechanical sealing linkage ring that generally adopts is the mosaic structure of tungsten-cobalt carbide with Ordinary Steel, because its high-temperature behavior and wear-resisting property are relatively poor, unreasonable structure has in addition directly influenced the leakage rate and the working life of mechanical seal.External most adhesive structure that adopts cemented carbide with the steel metal base is because the Bond Effect on Performance makes it be subjected to certain restriction in high temperature is used.Mechanical seal structure as shown in Figure 1.Mechanical seal structure is made of stuffing box gland (1), pump cover (2), axle sleeve (3), rotating ring (4), stationary ring (5), bellows (6), corrugated header (7), coolant jacket (8), gland (9) and pressing plate (10).
The preparation process of domestic current mechanical sealing linkage ring is: at first be prefabricated into widia sheet ring-type working surface, assemble with hot jacket or insert technology and stainless steel or carbon steel pedestal then.
The thermal expansion coefficient of tungsten-cobalt carbide cemented carbide is 4.5 * 10
-6[℃]
-1, the stainless steel hot expansion coefficient is 18.7 * 10
-6[℃
-2], carbon steel is 11.0 * 10
-6[℃]
-1, thereby cemented carbide differs bigger with the thermal expansion coefficient between the metal base, for guaranteeing the two excellent sealing performance arranged, and must have certain matching allowance.If it is too small that magnitude of interference is selected, can appear at the loose or dislocation of carbide ring under the serviceability temperature, if magnitude of interference is excessive, then cause carbide ring to hold to can't stand big stress and cracked.
Carbide ring behind the hot jacket bears certain stress deformation, though through grinding and polishing, make seal face reach required straightness, when practical application, along with the variation of factors such as temperature, pressure, the end face straightness can not reach original state all the time.This in addition builtup member is if standing time is long or room temperature changes, and the end face straightness also can change, as shown in Figure 2.Accompanying drawing 2 is a carbide ring, and a is the end face behind the grinding and polishing, and b is the end face of serviceability temperature when being lower than the grinding and polishing temperature, and C is the end face of serviceability temperature when being higher than the grinding and polishing temperature.Above-mentioned phenomenon is particularly remarkable to large-diameter hot jacket hard alloy seal ring.Moreover, if the machining accuracy of part is poor slightly or assemble improperly, also can leave the slit in the hot jacket cooperation place, medium might see through the slit under higher pressure cause leakage.
The rotating ring of adhesive structure because deterioration phenomenon often appears in the binder between carbide ring and the steel substrate, causes coming off of carbide ring.
The objective of the invention is to improve its every performance, reduce the rate of wear and the corrosion rate of seal face, improve the rotating ring surface hardness, adjust the specific pressure of bellows, obtain high performance novel mechanical sealing in order to overcome the shortcoming of above-mentioned sealing rotating ring.Cemented carbide of the present invention-base steel sealing movable ring with combined braze-welded structure is characterized in that reducing the content of binding metal in the cemented carbide, selects anti-corrosion binding metal phase, selects hardness height, corrosion-resistant, the cemented carbide that its expansion coefficient is complementary with base material.
For making mechanical sealing linkage ring be widely used in oil, chemical industry, for example contain 0.3～0.4%H in the crude oil
2S, operating temperature is 365 ℃, the oil refining process medium contains the bigger catalyst granules of concentration, must guarantee that cemented carbide has good hardness and resistance to flexure value, must improve the corrosion and the thermal expansion properties of widia simultaneously.
The interpolation of titanium carbide sclerosis phase has not only improved the hardness of cemented carbide, has also improved the matching performance of the thermal expansion coefficient between cemented carbide and the steel substrate simultaneously widely.But TiC solid solution can not be wetted fully and the restriction of Organizational Structure, makes the resistance to flexure of TiC-WC-Ni alloy lower than WC-Co, and increase with the content of TiC and to reduce.After adding metal molybdenum in the alloy, can obviously improve the wettability of titanium carbide, when molybdenum content increased to 10%, resistance to flexure reached maximum value, and alloy rigidity and molybdenum content also have similarity relation.
Nickel content is similar to the content influence of cobalt among the influence of TiC-WC-Ni-Co-Mo alloy property and the WC-Co, and molybdenum content remains unchanged in the TiC-WC-Ni-Co-Mo alloy, and with the increase of nickel content, the resistance to flexure of alloy raises, and hardness then descends.
Soldering mechanical sealing linkage ring of the present invention, selecting the cemented carbide composition for use is nickel 5～8%, and it is about 2～3% that cobalt binder accounts for mutually, and molybdenum additives is about 10%, the alloy of tungsten 15～20% and surplus titanium carbide, density is 5.4～8.0 gram per centimeters
3, hardness is greater than HRa92, and resistance to flexure is greater than 1400MPa, and thermal expansion coefficient is 9.5 * 10
-6[℃]
-1Basically the thermal expansion coefficient with carbon steel is complementary, and has avoided being out of shape leakage problem under the high temperature service condition.
Contain titanium carbide, nickel bonding phase cemented carbide, adopt vaccum sintering process production, according to batch size, the contraction ratio in Dimensions and the sintering calculates blank dimension, selects the moulding of steel form moulding oil hydraulic press for use.In order to make product obtain normal alloy structure, the ratio of control titanium carbide and Tungsten carbite is not less than 2: 1, and according to the difference of total carbon in the carbide, sintering temperature is at 1450 ℃～1500 ℃.
The specification of rotating ring has φ 50mm, φ 60mm, φ 70mm, φ 80mm, φ 90mm product.The one-tenth ring of rotating ring adopts soldering processes, and soldering in special vacuum high temperature furnace, is carried out in carbide surface and steel substrate surface under 700 ℃～900 ℃ and 2MPa negative pressure after pretreatment, the weld bond densification, the cementitiousness height, do not have leak, anticorrosive.The advantage of this rotating ring is to ensure surface corrosion resistance in the use, and is indeformable, and its base material is easy to machine shaping simultaneously, guarantees processing and Seiko is installed.Can use in that high temperature-aggressive medium is medium-term and long-term, in the crude oil medium of oil refinery 390 ℃ of temperature, contain H
2Use in the S medium, improved more than five times working life than old-fashioned close ring.
Embodiment
The making of φ 70mm rotating ring, get the 100Kg powder, nickel powder 5Kg wherein, cobalt powder 2.5Kg, molybdenum powder 8Kg, tungsten carbide powder 20Kg, surplus is TiC, get Bond (paraffin wax) 3.5Kg again, on porcelain ball mill, mixed powder 24 hours, moulding on the 400T oil hydraulic press, in the vacuum furnace of 0.2MPa, 450 ℃ are taken off Bond, and cemented carbide rings in vacuum sintering furnace was 1450 ℃～1550 ℃ sintering 30 minutes, its hardness reaches HRa92～94, resistance to flexure 1400MPa carries out the turning of base steel blank simultaneously, carries out vacuum high frequency composite welding then, Ag-Cu-Pb-Cd alloy brazed material is used in welding, cosolvent ammonium fluoroborate, welding temperature are 700 ℃～900 ℃, and pressure is 20MPa, cooling back car system is ground to final size φ
In70mm, φ
Outward93mm, thick 30mm ring.
Claims (3)
1, a kind of rotating ring that is used for the composite machine sealing is characterized in that rotating ring is the composite machine sealing rotating ring that carries out soldering with hardness alloy and steel substrate.
2, according to the said method for welding of claim 1, be at 700～900 ℃, pressure is to carry out composite welding under the 20MPa.
3, according to the said cemented carbide of claim 1, be the cemented carbide that contains TiC, alloy composition is Ni5～8%, Co2～3%, W15～20%, surplus is TiC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93102191 CN1092140A (en) | 1993-03-04 | 1993-03-04 | Sealing movable ring with combined braze-welded structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93102191 CN1092140A (en) | 1993-03-04 | 1993-03-04 | Sealing movable ring with combined braze-welded structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1092140A true CN1092140A (en) | 1994-09-14 |
Family
ID=4983986
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93102191 Pending CN1092140A (en) | 1993-03-04 | 1993-03-04 | Sealing movable ring with combined braze-welded structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1092140A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063204A (en) * | 2011-10-18 | 2013-04-24 | 上海航天控制工程研究所 | Sealing method of control moment gyroscope inner frame |
| CN103216466A (en) * | 2013-04-12 | 2013-07-24 | 丹东克隆集团有限责任公司 | Pumping serial mechanical seal device and pumping ring thereof |
-
1993
- 1993-03-04 CN CN 93102191 patent/CN1092140A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063204A (en) * | 2011-10-18 | 2013-04-24 | 上海航天控制工程研究所 | Sealing method of control moment gyroscope inner frame |
| CN103216466A (en) * | 2013-04-12 | 2013-07-24 | 丹东克隆集团有限责任公司 | Pumping serial mechanical seal device and pumping ring thereof |
| CN103216466B (en) * | 2013-04-12 | 2015-07-08 | 丹东克隆集团有限责任公司 | Pumping serial mechanical seal device and pumping ring thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |