Mechanical Seals Manufacturer In China » mechanical-seals

eed to seize the commanding heights of wind power development opportunities and challenges face

admin — Tue, 20 Jul 2010 10:00:09 +0000

“At present, China’s wind power turbines development much faster than expected, has entered the fast lane.” Wind power more than 20 years of experience in the Long Yuan Electric Power Group (hereinafter referred to as “Long Yuan Electric Power”), Chief Engineer, Xiao-Sheng Yang said that with the recent to a large number of wind turbine development, wind power has been shown to replace oil, coal and other fossil energy has great potential.
By the end of 2009, China’s wind power generator installed capacity in 4 consecutive years of growth to double, the first over Germany, ranked second in the world. “Great efforts to develop wind energy, not only is our response to the needs of global climate change, but also improve China’s energy structure and maintain the sustainable development of China’s energy industry needs.” Xiao-Sheng Yang said.
He said that the overall level of China’s wind power development with the world advanced level not very different. Seize a new wave of energy development, to gain the advantage in the international community demonstrated great power influence, China’s wind power in terms of responsibility practitioners.
Three major market opportunity
“Along with the rapid development of wind power industry, home wind turbines manufacturing industry has ushered in a rare development opportunity.” Xiao-Sheng Yang said, “If the goal of wind power installed capacity has been adjusted to ‘2020, 150 million kilowatts installed capacity’, that corresponding to the value of wind power equipment can reach about 750 billion yuan. ”
As he expected, the wind power market to attract this big cake, the resources have been transferred to the fan manufacturer. According to statistics, China’s wind turbine machine manufacturers have more than 80. Xiao-Sheng Yang believes that only through intense market competition, enterprises can accelerate the digestion and absorption of the advanced pace of wind energy technology, while encouraging continued research and innovation enterprise, manufacturing high quality fan.
He also thinks that the rapid development of wind power state for wind power technology in China and is also a rare opportunity for development. It is reported that since 2004, the state and the introduction of wind power businesses to invest in technology to carry out innovative research, and the acquisition cost of the test facility has more than 1 billion yuan, the current number of new scientific and technological achievements for the wind stream.
He also believes that wind energy technology should be at the current level of excellence, should be further strengthened basic research and materials technology research efforts to improve the quality and unit operation equipment availability, create and perfect with independent intellectual property rights brand unit.
In his view, the rapid development of China’s wind power challenges posed by the grid, actually facing the development of an excellent network opportunity. “150 million kilowatts of small wind turbines installed capacity, and finally issued by the power to conduct Absorptive and delivery to the user, which itself is a great opportunity.”
He believes that this is precisely the power to conduct large-scale development and the corresponding transformation of the perfect opportunity, “in the course of development of wind power, power grid construction will be enriched and strengthened to become involved in many business types, business has been expanded . can be expected in the future most likely benefit from grid enterprises. “Xiao-Sheng Yang said.
Face three major challenges
“Behind the rapid development of wind power, the same three issues deserve our attention.” Xiao-Sheng Yang respect, first of all power and wind power are not supporting the issue.
Most of China’s wind energy resources, distribution of points in the northwest, north, northeast and other regions, far from the eastern load centers. “Although the” Renewable Energy Law “provides that the acquisition of its power grid enterprises should cover the full range of renewable energy projects in the electricity grid and provide Internet services. But there are still difficulties currently running, sent by the constraints of wind power . ”
As Xiao-Sheng Yang said, now in Gansu, Inner Mongolia and other places, although some wind farms have been built, unit commissioning has been completed, but power was not complete in the strong seasonal wind, wind power can not be networked, fans had to stop or part of the shutdown.
“According to incomplete statistics, the major vertical wind turbines business in 2008 due to limited electrical power lost about 372 million kwh of electricity, in January 2009 to May lost about 615 million kwh of electricity. Second half of 2009 power loss even worse. power despite increased efforts to complete construction, but because of rising construction speed of wind power in general loss of power is increasing. “Xiao-Sheng Yang says.
Secondly, he thinks I made the quality of the wind turbine needs to be improved.
At present, the problem of poor quality of domestic equipment has been gradually exposed, “the two years in 2007,2008, our wind generators farm by domestic equipment deliveries are on time, not complete, unit commissioning a long time, tune out the crew pass Run assessment, fans and other items can not put into troubled time. Even if wind put into operation, there is also many times the quality and technical problems in leaf fracture, crack wheel, gear box failure, electrical failure, etc.. “In his view years, as less than the quality of mechanical equipment, failure of the high rate of real quality has not been fully exposed, the greater challenge is yet to come.
Finally, he considered relevant to the current field of wind energy regulations, policies, and industry services to be improved.
He said that although China has promulgated the “Renewable Energy Law”, but need refinement, need further provides that the parties wind power industrial chain of responsibility and obligation.
He also stressed that, although the Woguo on wind power design Zixunjigou, academic organizations, associations organizations, Xin Xi intermediary Renzhengshiyan Yijizhuanye Yunxingweixiu Deng Ye wind power service agencies have Jian Li, and play an increasingly important catalytic role but now all Tiji not perfect, the authority of the relevant services, coordination, and credibility are to be improved.

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A new range of non-contacting mechanical seals

admin — Tue, 15 Sep 2009 14:03:51 +0000

Designed for non-turbo, large – bore rotating equipment applications, the new Type 2800X dual seals feature patented new technology that provide environmentally-friendly and emission-free sealing. The 2800X seals have been created for use in a wide variety of performance-critical applications. These include the processing of extremely pure materials where no contamination is permissible, the use of reactive or temperature-sensitive media where local process ‘hot spots’ can cause unwanted chemical reactions, cold applications such as ammonia processing, and air/oxygen-sensitive processes where unwanted oxidation reactions could occur. The seals feature spiral grooves machined into the mating ring faces of the seal heads. As the pump shaft rotates a pressurised inert gas is injected between the faces and compressed as it flows into these grooves. The gas expands again as it leaves the spiral grooves and generates a force which separates the faces to create non-contact operation. This minimises seal face wear, reduces running and repair costs and extends seal life. Because the gap between the seal faces is kept to a minimum, barrier gas usage is also reduced. A reverse pressure capability ensures that if the barrier gas fails the process pressure will close the seal faces, preventing any large-scale loss of process fluid to atmosphere. The result is safer and more environmentally-friendly operation, even under breakdown conditions. The system also eliminates the need for any complex barrier fluid system, which simplifies the installation procedure. This environmentally friendly performance of the 2800X seals also translates into greater economy for the end user. Figures released by the Fluid Sealing Association show that these seals reduce the cost of electricity used and the associated greenhouse gas emissions by 92% when compared to a conventional wet seal rotating at normal pump speeds and pressures. The patented 2800X design can accommodate both lower and higher speeds and pressures than similar seals and this further extends reliability, while the use of new polymeric components reduces hang-up problems with solid-in-liquid process fluids. The various 2800X seals also incorporate many common components. This minimises spares stockholding and also encourages the re-use, refurbishment and re-cycling characteristics of the seals. The ability to retrofit the 2800X range into installations currently using John Crane 2800, 2800ER, and 2800HP seals enables end-users to upgrade their current sealing arrangements as part of their normal maintenance programmes. Included in the 2800X range are versions that meet and exceed the performance and design requirements of the latest American Petroleum Institute API 682 edition seal standard. For more details please contact John Crane.

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Rotating Face Mechanical Seals

admin — Tue, 25 Aug 2009 03:21:06 +0000

Engineered for every shaft-sealing application in maintenance.. new production or conversion from braided pump packing. American Seal and Packing delivers a full range of rotary mechanical seals configurations and component materials – to handle virtually and fluid moved by any equipment. When you Specify a ASP seal you can the advantage of the most advanced mechanical seal technology, the latest in filed proven design and when working with our outside sales force hands on technical support. Rotating face units are the dependable mechanical seal answer for worn equipment when your shaft seals must be replaced. They are ideal for new equipment designs or to improve the usefulness of existing equipment by converting from pump packing.

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Mechanical Seals Introduction

admin — Sat, 01 Aug 2009 15:08:34 +0000

Mechanical seals are being used increasingly on fluid pumps to replace packed glands and lip seals. Pumps with mechanical seals perform more efficiently and generally perform more reliably for extended periods of time.

Mechanical seals are provided to prevent pumped fluids from leaking out along the drive shafts. The controlled leakage path is between two flat surfaces associated with the rotating shaft and the housing respectively. The leakage path gap varies as the faces are subject to varying external loads which tend the move the faces relative to each other.

The mechanical seal requires a different shaft housing design arrangement compared to that for the other type of seals because the seal is a more complicated arrangement and the mechanical seal does not provide any support to the shaft.

In order for the mechanical seal to perform over an extended time period with low frictional the faces are generally hydrodynamically lubricated. The fluid film will need to carry substantial load. If the load becomes to high for the film surface contact will take place with consequent bearing failure. This lubricating film is generally of the order of 3 micrometres thick , or less. This thickness is critical to the required sealing function. Mechanical seals often have one face of a suitable solid lubricant such that the seal can still operate for a period without the fluid film.

Pressure Balance Mechanical Seals

It is possible to reduce the seal contact pressure by using a pressure balanced seal design of off-set a proportion of the force generated by the pumped fluid pressure. This principle is illustrated in the sketch below

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Ultra-high pressure seals the finite element analysis

admin — Thu, 28 May 2009 02:12:54 +0000

For petroleum, chemical and other areas of the high-pressure sealed containers, the seals working environment, prone to severe deformation and intensity of inadequate disclosure failures. Using finite element method study of high-pressure sealing contact with the container strength and deformation problems, the use of ANSYS and MATLAB software analysis of the sealing surface contacts in a multi-pressure conditions, the Composite stress distribution and seal deformation, and reveal its trend for a new type of seal design, material selection to provide an analytical basis. Key words: ultra-high pressure vessel; seal devices; contact analysis; finite element method
The introduction of a new type of ultra-high pressure containers (pmax = 102 MPa) with the exception of sand, sewage functions, is very important in the desert oil fields of the chemical plant, the upper part of Figure 1 Schematic diagram of the container. Figure 1 Schematic diagram of ultra-high cooling container 12 hoop ; 22 seals; 32 cap; 42 bolts; 52 cylinder design requirements in accordance with the container, sealing cone taper to 8.5 °, the contact cap and the cylinder cone taper to 10.5 °, sealed with the cap up and down plane and the cylinder with the initial gap of D = 0.55mm, as shown in Figure 2. in the circumstances is not contained, sealed up and down cone and cylinder with a conical cap with the contact for the two cone Line contact; by the set, the sealing line of contact with the expansion cone by the torus for small contacts, increasing the contact area. horizontal clamp bolt tightened, the seal with the role of relying on the cone so that the cap and the cylinder in the axial occurrence of relative movement of the card into the hoop on the volume of the axial force generated in order to achieve pre-sealed. when the container internal pressure to rise, the media pressure generated by axial
Transmission of power from the roof to the hoop, hoop along the trend of the expansion cone bolt from horizontal to achieve the self-locking pull. Figure 2 high-pressure seals and cone diagram node number on the cone é2;? 2 plane;? 2 under the cone; ì2 plane;? 2 inner face of the sealed container, the seals in the state of the contact pressure distribution and synthesis of stress, deformation of the size of seals and other factors have a decisive effect on the sealing effect is the key to the design of pressure vessel technology. In this paper, finite element method, using MATLAB software AN2SYS and analysis of the low pressure and high pressure seals, such as state of the contact pressure, the integrated stress and deformation of seals, the results of research and development of high-pressure vessel has a .1 a good guide for finite element model of the overall exposure to 1.1 contact seals the top and bottom of the cone and cylinder with a conical cap with a typical non-linear contact problem [122]. not under pressure, the cone contacts the two contacts for the line; pressure after sealing cone from the line of contact with the expansion of access for small torus. the complexity of the performance of the following two points for the .1) and cylinder seals, cap the size of the contact area and the relative position and the contact state is unknown in advance, and with changes in load and time required to solve identified in .2) and cylinder seals, top of the contact between the stress and deformation is nonlinear. Solving constraints to unilateral constraints. The method bound to the tangential contact conditions and contact with the two conditions. Act to include access to the contact interface to the law of non-penetration and the pressure to the contact force for the state to determine whether to contact conditions; tangential contacts to judge the condition that the two objects have come into contact with surface contact state between the specific conditions. The range of conditions characterized by unilateral constraints and strongly nonlinear .1. 2 contact with the mathematical model 1.2 . 1 contact the election principle of virtual displacement cone cap, seals on the cone, respectively, as A, B for solving the two regions, each in contact with the surface of the border can be seen as the border to定力time t + $ t-shaped spaces within the conditions equivalent to the balance principle of virtual displacement can be expressed as ∫ t + $ tt + $ tSijDt + $ teijt + $ tdV-t + $ tWL-t + $ tWI-t + $ tWC = ΣA, Br = [∫ t + $ tvrt + $ tSrijDt + $ tert + $ tijdV -t + $ tWrL-t + $ tWrI-t + $ tWrC] = 0 where: t + $ tWL = ΣA, Br = t + $ tWrL, t + $ tWI = ΣA, Br = t + $ tWrI, t + $ tWC = ΣA , Br = t + $ tWrC = ΣA, Br = ∫ t + $ tt = $ tsrcFriDur t + $ tidS = ∫ t + $ tt = $ tscFAJ (DuAJ-DuBJ) t + $ tdS a variety of more than t + $ tWL for time t + $ t Euler stress configuration; Dt + $ teij, Duri is the infinitesimal strain variation; t + $ tWL for the role of time t + $ t load configuration on the outside of the virtual work; t + $ tWI to act on the moment t + $ t configuration on the virtual work force of inertia, if the effects of inertia force can be ignored, then WI = 0; t + $ tWC for the role of t + $ t in contact with the surface of contact force at all times of the virtual work; V, S and Q, respectively, for objects the size of , surface area and mass density; t + $ tFAi and t + $ tFBi were conical cap, seals on the cone t + $ tSAC, t + $ tSBC contact pressure on the t + $ tFA and t + $ tFB along the general coordinates i = x, y, z the weight, and t + $ tFAi and t + $ tFBj is along the local coordinate system of their weight. contact interface t + $ tSC the regional and state is by solving the check and search before a given
Of. Contact pressure t + $ tFA and t + $ tFB is the unknown quantity, determined by solving .1. 2.2 conditions for the introduction of contact constraints by solving the Lagrange theory of knowledge, contacts seal pan-cone function can be expressed for 0 = 0U +0 CL. Type in the: 0U, for contact constraints do not include the total potential energy, 0CL is a Lagrange multiplier method to introduce additional contact constraints functionals, relative sliding cone surface, the contact problem of virtual work equation can be written as t + $ tWC =- (D0CL) u = ∫ – t + $ tt + $ tScKN × [(DuAN-DuBN)-L (uqJ? uq) × (DuAJ-DuBJ)] t + $ tdS (J = 1,2)-type can be seen above, for sliding contact state with or without friction, only an independent Lagrange KN, solving the need to add only a law can not be used to bound into the conditions of: uAN – uBN-tgqN = 0, uAN, uBN respective point of contact for the top cone, the cone seal surface contact point in the direction of law to the incremental displacement, tgqN is the contact point cone cap, seals on the cone contact point in time t the location of the contact method to measure the distance direction. Lagrange method with the introduction of the contact interface constraints, the use of recursive iterative Newmark method can be sealed pressure vessel contact Finite Element Equations solution.
1.3 High Pressure Vessel sealing contact with the issue of finite element simulation 1. 3.1 modeling ideas and as a result of sealing cone of the conical cap and the cylinder line contact for initial contact, can not afford a lot of axial force Therefore, locking in the clamp force will produce a certain deformation of the taper, leading to the roof with flat sealing contact with the cylinder-plane contact under seal. ANSYS to create contact, if only consider the cone from top to bottom, ignore the upper and lower plane load directly, as a result of the carrying capacity of the axial line of contact is extremely poor and unstable model, the calculation can not be correct. In order to enhance convergence of the calculation, the results have been satisfactory, the usual approach is to pre-load the target surface contact surface to the initial penetration, is about to Figure 2 in the gap between the upper and lower pressure level and also create a contact print, using upper and lower seals add auxiliary bound plane, so that there is sufficient load-bearing capacity, the calculation can achieve more desirable results. 1. 3.2 conditions of load calculation unit type PLANE 42, the definition of symmetry axis, calculating the initial conditions are as follows: (1) does not consider the roof of the self; (2) interception of part of the lower cylinder axial restraint increases; ( 3) cylinder wall increases pressure p1; (4) to exert pressure on the clamp ps.1. 3. 3 clamp load pressure ps selected as the basis for self-locking seal type, clamping force clamp pressure with the cylinder and changes in the internal pressure cylinder only know that circumstances can not be pressed at the same time to identify and clamp the upper and lower cone pressure seals. in as close as possible to real
The occasion of the work under the premise can be considered the operator of ANSYS, the following programs: (1) upper and lower sealing cone, from top to bottom and top plane, cylinder to create a total of four contacts. (2) to ensure that both seals in the high-pressure or low pressure cone on the case are sealed, there is no contact pressure from top to bottom plane or very small. that is, in a variety of different conditions, using ANSYS spreadsheet 0.55 mm, respectively, by pressure clamp on the normal pressure, the pressure than the cylinder pressure to be slightly larger body. correspond to the pressure as listed in Table 1. Table 1 and the clamp cylinder pressure corresponding to the value of 061,860,102 Table MPa air pressure inside the pressure clamp 0.67.82478.51331. 3.4 Multi-Seal Analysis The following discussion of the body tube gas pressure 0,6,18,60,102 MPa, respectively, the seals on the cone (the cone and the cone of symmetric, so only on the cone) of the contact pressure, stress and the integrated node Drive to the deformation conditions, the relevant curve in Figure 4 as shown in Figure 6 [3]. 1) The contact pressure can be seen from Figure 4 cone seal contact pressure distribution on the trend: no matter what kind of gas pressure in the state, are the node 1 that the initial point of contact for the following line under the pressure that the contact pressure Fig.4 integrated stress curve of Figure 5 Figure 6 radial deformation curve of the largest power; to participate in the nodes are in contact with the cylinder pressure increases within the increases. in high pressure on the cone when the 2,3 node also participated in the contacts of the contact cone into contact with the line contact Cyclotella .2) Integrated stress can be seen from Figure 5, the conical seal With the cylinder internal pressure stress increases, node 1 and the cone with the rounded corners on the plane there is stress concentration; in the same working conditions: low pressure, the stress cone seals on to the next followed by the increase in ; high-pressure, the first increase and then decreased, and then has been on the increase in the seals on the cone with the rounded corners on the largest plane to more than 1000 MPa, so the requirements of the material is relatively high .3) of radial deformation as shown in Figure 6 , in the low-pressure seals, the deformation of the cone are negative, this is because the clamp locking force, air pressure inside small, not enough to seal the expansion along the radial outside. high-pressure, the seals on the cone some deformation of node negative, the next part of the node is positive, indicating that seals the inner surface recessed, large contact area .2 conclusions 1) ultra-high pressure seal when squeezed by the strong, easy to seal materials have a large plastic deformation and loss of flexibility, so that sealing performance of a sharp decline, resulting in duplication of the low utilization rate of seals, it should be made with reference material largest integrated ANSYS calculated stress, after a number of factors integrated .2) processing seals must maintain cone face the overall consistency, avoid contact with large localized surface deformation Bump .3) ultrahigh-pressure fluctuations in pressure sealed containers, and instantaneous temperature rise, lead to increased seal plastic rheology, resulting in large deformation, and even a partial cracks. At the same time as a result of pressure changes in the load cycle, upper and lower seal surface contact fatigue and even prone to wear and tear. References [1] WANG Xu-cheng, SHAO Min. the basic principles of finite element method and numerical methods. 2nd ed. Beijing: Tsinghua University Press, 1997 (next to No. 1072) 7501 No. 6 GB costs, such as: ultra-high pressure seals the finite element analysis

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China mechanical seal technology to achieve a major breakthrough

admin — Fri, 15 May 2009 10:54:45 +0000

Refinery 70% of security incidents are caused by leaking seals, the leakage prevention has been a worldwide problem. Recently, oil from the Northeast Refinery Engineering Co., Ltd. was informed that this problem has been the source of the company’s employees to break Zhao. He presided over the “mechanical seal technology” at the national science and technology awards at the 2008 national scientific and technological progress second prize.

Zhao was a source of general staff, practitioners of the self-study after the design and installation of mechanical seals, mechanical seal principle, metal materials science, processing and so on. More than a decade, his own measurements, painting their own drawings, modification of the seal. In a set of imported equipment of the United States seals the transformation of its one-for-life from a few days into a year-for-6, while the highest is only for 3 years to create the current world record. Practitioners so far, he has 75 sets of imported equipment of the seals of the 81 had made the transformation, in order to create value more than 2500 million.

Experts believe that “mechanical seal technology” means that the mechanical seal device of the realization of the domestic and world advanced level, to fill the gap, putting an end to seal the history of relying on foreign imports.

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How mechanical seals work (What is mechanical seals)

admin — Sat, 18 Apr 2009 04:14:07 +0000

Mechanical seals within this group are used mainly in the chemical process, petrochemical and similar industries, where leakage control is highly important due to the working fluid characteristics, it can be toxic, corrosive or explosive, this type of mechanical seals usually work under very critical conditions, for that reason some of them are hydraulically balanced to support high pressures, besides they can be manufactured with the appropriate materials to resist extremely high or low temperatures.

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Mechanical seals

admin — Tue, 24 Mar 2009 04:09:55 +0000

Include: mechanical seal components, shaft seals, sealing rigid, light sealed, medium sealed, heavy-duty sealed, ceramic seal, graphite seal, silicon carbide seals and other products, products with the specifications of models, varieties Qi finished, durable, non-drop leakage and other characteristics. Materials used silicon carbide (SIC), Tungsten Carbide (WC), graphite (M), high purity alumina (AL2O3.99%), metals, ceramics and other materials. Widely used in dairy, food, beverages, beer, pharmaceutical, metallurgical, chemical, daily-use chemicals, fine chemicals, such as supporting the use of mechanical equipment, the technology reached the international leading level, and undertook a variety of non-standard seals Development and production

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Mechanical Sealing the role and significance of

admin — Sat, 21 Mar 2009 01:13:22 +0000

In the hydraulic system and its system, the sealing device used to prevent leakage of the work of media within and outside the dust and the intrusion of foreign bodies. Sealed from the role of one of the components, ie seals.

Leakage will result in medium waste, pollution machines and the environment, and even give rise to malfunctioning machinery and equipment for personal accident.

Leakage within the hydraulic system will cause a sharp drop in volumetric efficiency, amounting to less than required by the job stress, and even should not work.

Micro-invasive system of dust particles, can cause or exacerbate friction hydraulic component wear, and further lead to leakage.

Therefore, the sealing device seals and hydraulic equipment are an important part. The reliability of its work and life, is a measure of the hydraulic system an important indicator of good or bad.

In addition to sealing gap, are the use of seals, so that two adjacent surface coupling between the gap control at the required sealing liquid through the smallest gap below.

At contact seal, pressed into self-proclaimed style-type mechanical seals and self-styled self-tight seal (ie seal Lamiaceae) two.

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