Top Notch Carbide
Drive pins in a mechanical seal
Mechanical seal provides a sealing between a rotatable shaft and a housing. The seal has a stationary part for connection to the housing and a rotary part for rotation with the shaft. Mating sealing faces are carried by the stationary and rotary parts and the rotary parts are mounted on the drive shaft for rotation therewith. Each sealing face is held relatively stationary to their respective stationary or rotary part by means of at least one link member extending therebetween. The link member is arranged for at least limited longitudinal rotation.
A mechanical seal comprises a “floating” component which is mounted axially movably around the rotary shaft of, for example a pump and a “static” component which is axially fixed, typically being secured to a housing. The floating component has a flat annular end face, i.e. its seal face, directed towards a complementary seal face of the static component. The floating component is urged towards the static component to close the seal faces together to form a sliding face seal, usually by means of one or more springs. In use, one of the floating and static components rotates; this component is therefore referred to as the rotary component. The other of the floating and static components does not rotate and is referred to as the stationary component.
Those seals whose floating component is rotary are described as rotary seals. If the floating component is stationary, the seal is referred to as a stationary seal.
If the sliding seal between the rotary and stationary components are assembled and pre-set prior to despatch from the mechanical seal manufacturing premises, the industry terminology for this is “cartridge seal”. If however the rotary and stationary components are despatched individually (unassembled) from the mechanical seal manufacturing premises, the industry terminology for this is “component seal”.
Seal faces are generally held to their relevant stationary or rotary components by a mechanism that is called drive ring. One of the common mechanisms is the use of slots on the back of seal face and lugs on the drive ring or vice versa. FIG. 1 shows four slots on the seal face and four lugs on the drive ring. FIG. 2 shows two lugs on the seal face and two lugs on the drive ring. Rotation will be transferred from the seal faces to the drive ring at rotary faces or vice versa at the stationary faces.
Seal faces are mainly supplied from various grades of silicon carbide, tungsten carbide, ceramics and carbon. Carbon is categorised as a soft face.
The contact between the slots and lugs is mainly point contact. Under point contact, soft or brittle seal faces are more prone to failure than hard faces, especially in high pressure and large seal size applications. The failure may start by notch propagation around the contact point which gradually grows until it destroys the seal face.
Instead of having lugs on the drive ring, some designs employ drive pins that are pressed firmly into holes in the drive ring. These pins cannot move or rotate from their location. FIG. 3-2 illustrates the use of two pins to drive a lug on the seal face when the seal rotates either in clockwise or counter-clockwise direction. If the mechanical seal is designed to only rotate in one direction, one pin can be used for each lug. Alternatively, the pin may be square, cylindrical or any other shape
The pin’s head may have different shapes which are related to the contact area at the slot. FIG. 6 illustrates a different shape for the head of the floating pin illustrates a different contact area between the floating pin and its relevant slot.
The type of drive can be switched for rotary and stationary faces according to application. Similarly, some pieces of equipment such as shaft and pin in FIG. 8 may be stationary and the other pin may be rotary. It should be understood that the invention may be used with metallic components as well as nonmetallic components.
Depending upon the application of the seal, a floating pin of the present invention may be located at any position or angle relative to the seal faces.It should be understood that the invention may be employed for either rotary or stationary seals and single or double mechanical seal, whether designed in a cartridge or component seal format.
About the Author
Ningbo Yinzhou Guowei, mechanical seal Component Factory is a professional engaged in the design, development, manufacture, sale of various cartridge seal and flygt seals business. Production and testing are well-equipped with a high-quality staff.
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5pcs KENNAMETAL NG3094L KC5010 Top Notch Carbide Inserts $45.00 |
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20 TOP NOTCH NG 3105L GROOVING CARBIDE INSERTS I116S $79.99 |
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KENNAMETAL NDC4040L3 KC710 TOP NOTCH CARBIDE INSERTS $45.59 |
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Kennametal Top Notch RD 12P Grade K6 Carbide Inserts $17.95 |
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Kennametal Top Notch GC6250 Grade K420 Carbide Inserts $17.95 |
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Kennametal Top Notch NPR52 Carbide Inserts Grade K313 $14.95 |
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DWG Kennametal Top notch carbide inserts (5) $14.99 |
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DWG Kennametal Top notch carbide inserts (2) $4.99 |
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NEW (Total of 20) Kennametal Top Notch NB3R 132F K7H Carbide Inserts (Lot#239) $54.99 |
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Kennametal Top Notch Carbide Insert NPL332F KNGX 22 04 08 L20 $9.35 |
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NEW 5/8″ TOP NOTCH CARBIDE BORING BAR C10-NEL-2 W/ KENNAMETAL INSERT NT2R. X359 $200.00 |
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1/2″ TOP NOTCH CARBIDE BORING BAR C08-NEL-2 W/ KENNAMETAL CARBIDE INSERT X361 $150.00 |
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1/2″ TOP NOTCH CARBIDE BORING BAR C08-NEL-2 W/ KENNAMETAL CARBIDE INSERT X360 $150.00 |
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NEW 5/8″ TOP NOTCH CARBIDE BORING BAR C10-NER-2 W/ KENNAMETAL INSERT NT2L. X357 $225.00 |
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NEW 5/8″ TOP NOTCH CARBIDE BORING BAR C10-NEL-2 W/ KENNAMETAL INSERT NT2R. X358 $200.00 |
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NEW 3/4″ TOP NOTCH CARBIDE BORING BAR C12-NER-2 W/ KENNAMETAL INSERT NTP2L. X356 $250.00 |
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PCG 4189R GRADE PC5, GROOVING TOP NOTCH CARBIDE INSERT $11.20 |
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Kennametal NJ3010L16 KC5010 Top Notch Carbide Inserts $60.79 |
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8 new KENNAMETAL NT2R KC5010 NT-2R Top-Notch Carbide Inserts 1796049 $85.50 |
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Kennametal NG3088L KC810 TOP NOTCH Carbide Inserts $85.46 |
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NG 4189L Top Notch Carbide Inserts Grade K45 Kennametal 1 Pcs $0.99 |
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NG 4189L Top Notch Carbide Inserts Grade K45 Kennametal 5 Pcs $19.95 |
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CARBIDE INSERT KENNAMETAL TOP NOTCH NR-3031L K68 10 PCS NEW $35.00 |
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DPGR 432 Top Notch Carbide Inserts Grade KC 810 KENNAMETAL 5 Pcs $9.99 |
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KENNAMETAL NR3062R KC950 TOP NOTCH GRV CARBIDE INSERT $7.50 |
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20 NEW VALENITE TOP NOTCH NR 2031R CARBIDE INSERTS S200 $119.99 |
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NTB3LA Top Notch Carbide Threading Insert KC810 Kennametal 1pc $7.95 |
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Kennametal Top Notch tool holder indexable Carbide Inserts grooving slotting $3.85 |
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LAST 50 NEW TOP NOTCH STYLE CARBIDE INSERTS GROOVING $67.49 |
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1 NEW KENNAMETAL TOP NOTCH TOOL HOLDER 5/8″ w 10 NT3R NORDIC CARBIDE INSERTS{46} $89.99 |
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KENNAMETAL NB2R K420 TOP NOTCH CARBIDE INSERTS $73.91 |
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Top Notch $10 Top Notch – Shamrock |
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Top Notch Food Storage Container Cover $3.62 Top Notch Food Storage Container Cover |
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Van Heusen Studio Top Notch $170.85 Van Heusen Studio Top Notch Eyeglasses for Men are available at BestBuyEyeglasses.com in the following colors: Black, Tortoise. The style is Rectangle and the frame material is Plastic. Van Heusen Studio Top Notch Plastic. These frames accept prescription lenses. |
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Top Notch 1 with Super CDROM $53.53 Top Notch, a dynamic 6level course for international communication, sets a new standard, using the natural language that people really speak. With a rocksolid learnercentered approach, Top Notch provides students an opportunity to confirm their own progress at the end of every easytoteach twopage lesson. Features of Top Notch 1Essential model conversations that make key social language unforgettable and easy to personalize Intensive vocabulary development with active recycling Complete grammar supportextended by a boundin Grammar Booster Top Notch Interactions unique stepbystep discussion builders that guarantee success for all learners Thorough attention to pronunciation A wide array of learning strategies and activities that promote critical thinking Authentic and refreshing content that connects students to the real world Author: Saslow, Joan M./ Ascher, Allen Binding Type: Paperback Publication Date: 2006/07/01 Language: English Dimensions: 10.60 x 8.20 x 0.30 inches |
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North States NS8699 Top-Notch Pet Gate $38.95 “North States Top-Notch Gate NS8699 Brand New Includes One Year Warranty, The North States NS8699 Top-Notch pet gate features a one of a kind adjustable pressure-mounted gate with exclusive memory-lock which ensures that the lock retains its locking position even when its removed. The top-notch pet gate is 23 inches in height and fits easily into openings ranging from 28 inches to 41 inches wide . The top-notch pet gate’s design boasts of a heavy duty, uni-body construction. NS8699 Features: Top-Notch Pet Gate, 28-41″”W x 23″”H, Plastic Finish, Memory Lock Feature” |
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TOP NOTCH 1-WORKBOOK $15.55 Excellent Condition Used |
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TOP NOTCH 1-W/CD $31.85 Brand New |
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Top Notch 2 with ActiveBook $33.06 No Synopsis Available |
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Carlisle 1030107 1/6-Size Top Notch Food Storage Container, Polycarbonate, Clear $3.42 Carlisle 1030107 1/6-Size Top Notch Food Storage Container, Polycarbonate, Clear |
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