Hollow mechanical seal rings
According to a first aspect of the invention a mechanical seal ring has a hollow cross section which is open at its radially innermost side and has limbs generally directed towards the radially innermost side. The radially outermost region of the cross section is provided with reinforcement so as to locally increase its hoop strength.
One known form of sealing ring has a radial cross section of C shape, with the open side of the C facing the center of the ring. Another known seal is that known as the “Ellipseal” (Trade Mark), described in British patent specification 2187805, comprising a radial cross section of modified parabolic form with convergent margins. A further known seal is that of GB 2038961, in which the limbs of the seal cross section have out-turned lips, forming an ?-shaped cross section.
The above-mentioned seals have been very successful in numerous static sealing applications, but are not always entirely successful in meeting the demands of sealing equipment and pipelines used in natural gas fields, where pressures are commonly in the region of 10000 PSI, and may exceed 30000 PSI.
A reason for the lack of success with the known seals when sealing extremely high pressures, is their lack of hoop strength. Because of this, the seal rings expand under the applied internal fluid pressure until they can expand no further because of the restriction imposed by the recesses in which the seals sit. During this change of diameter of the seal ring, the areas of the seal ring surface in contact with the mating faces to be sealed are subjected to a galling action which roughens the surfaces, and in most cases it becomes impossible to establish a satisfactory seal. If the thickness of the seal ring metal is increased, to increase the hoop strength, the flexibility of the seal is substantially reduced, as the seals are made of metal of constant thickness. This then requires larger bolts and increased torque to compress the seal, and makes the seal less able to cope with rotation of the flanges to be sealed, i.e. loss of paralellism, which can occur under the action of the pressure of a contained fluid.
An object of the present invention is to provide a self-energizing metal seal capable of overcoming the described shortcomings of the known seals, and in particular capable of providing reliable sealing against a fluid at very high pressure.
According to a first aspect of the present invention a mechanical seal ring has a cross section which is hollow and open on its radially inner side and has convergent limb regions at this side, and the radially outermost region is provided with reinforcement locally increasing its hoop strength. Preferably the reinforcement of this outermost region is provided by a greater thickness of material than radially inner limb regions which in use engage the surfaces to be sealed.
The increased material thickness in the radially outermost region and resulting increased hoop strength resist expansion of the seal in use, whereas the smaller thickness of inner regions, comprising the flexible limbs which contact the surfaces to be sealed, provides ample flexibility. Relative movement of the seal and sealed surfaces is therefore reduced or eliminated, so that the seal is not subjected to galling and roughening, but the load required to compress the seal is not substantially increased and the seal remains sufficiently flexible to accommodate misalignment and lack of parallelism of the surfaces to be sealed.
In a mechanical seal ring of the kind generally according to the foregoing, the reinforcement of the radially outermost region is provided by an increase of the thickness of the ring material in this region; this thicker region is shaped to provide an axially broad outer rim or heel surface generally parallel to the axis of the ring; the radially innermost free ends of the limb regions have axially outwardly projecting tips which provide the maximum axial dimension of the ring in its relaxed state; and the limb regions have, radially external to the said projections, regions of reduced axial thickness providing points of preferential flexing of the inner ends of the limb regions during axial compression.
Mechanical Testing Puts Tire Rims to the Test
When metal parts or products fail to perform as expected, Laboratory Testing Inc. uses a variety of metals testing services to help identify the reason. The engineers at Laboratory Testing utilize appropriate mechanical testing, chemical analysis, metallurgical testing and nondestructive testing methods to determine material composition, mechanical properties and the existence of defects. The results of the metals testing and additional research into the nature of the failure will provide facts pointing to the source of the problem. Oftentimes, the failure research and evaluation of the metals testing results are used as evidence in legal cases.
One such case involved the safety and performance of metal tire rims. Laboratory Testing Inc.’s client needed a comparison of cast after-market wheels involved in an auto accident with forged factory-standard rims made for the same vehicle. The vehicle’s after-market wheels shattered upon impact with a concrete curb during the accident, so Laboratory Testing performed metals testing to compare both types of rims and to determine the ability of each to withstand a similar impact.
A mechanical testing impact test was used to replicate the force applied to the wheels during the accident. The mechanical testing impact test involved allowing a 1,000 lb. weight to free-fall directly onto each rim from increasing heights, which created various ft. lbs. of energy.
The cast after-market wheel was impact tested at 3,000 and 5,000 ft. lbs. of energy. The first wheel cracked at 3,000 ft. lbs. and a second one shattered under 5,000 ft. lbs. of energy. The forged factory rim was impact tested at both 5,000 ft. lbs. and 10,000 ft. lbs. and showed no breakage.
Complete details of the mechanical testing impact test methodology and results were documented in a Certified Test Report for the customer who ordered the metals testing.
Mechanical Seal Gets Aggressive
Mechanical seal, the retailer of teen and twenty-something fashions, has made a turnaround from negative profits to profits and then some. The company now competes with retailer Forever 21 when it comes to quick turnaround of trendy clothing and accessories sold at affordable prices.
One of the major differences however, between mechanical seal and Forever 21 stores is in the customer service and closing of the sale. Forever 21 sales associates watch over the dressing rooms and ring up the sales without being annoying or pushy about selling clothing. In other words they assist the customers where needed without being overbearing or annoying.
mechanical seal’s sales associates, however, have taken a turn for the pushy ever since the launch of the Seal Deal card. Purchased for $20, the card can be shown at the time of purchase at any mechanical seal store for 10 percent off of each item regardless of whether it is a regular, sale or clearance-priced piece of merchandise. The card is good for one year from the date of purchase.
Shoppers at mechanical seal can be assured that not only will a sales associate attempt to sell customers more clothes as they are shown a dressing room, but that they will be pushed to purchase a Seal Deal card while at the register.
It would be only slightly annoying if customers were asked if they were interested in purchasing the card and then that be the end of it, but some sales associates have become pushy and aggressive.
The typical sales pitch for the card includes the associate telling a customer that if they purchase the card in addition to the clothes they buy, the card is free. For example, if a customer spends approximately, $150 on one transaction at mechanical seal, and they buy the Seal Deal Card, they receive 10 percent off of each item purchased. The 10 percent savings from each item purchased then theoretically goes toward the $20 price tag of the Seal Deal card making it “free.”
Any smart shopper knows however, that the card is not free because a customer is paying for it out of their 10 percent savings from the card. While a person may not have had the savings without the card in the original purchase transaction, they also did not have to spend the $20 on a card.
Incidentally, the card is a good deal if someone frequently shops at mechanical seal. Customers should be smart in deciding whether or not the card is something that will save them money in the future based on how much they normally buy at mechanical seal. If someone is making at least one purchase per month at mechanical seal, then they might consider the card.
This individual not only went into the sales pitch of how the card would be free because of the amount of clothes being purchased, but she was also unprofessional enough to say (in front of the customer) to another sales associate that if she was able to sell the Seal Deal card in this transaction, she would have made her quota for the month.
After the associate was told the customer bought a Seal Deal card about 2 months ago, the associate went on to say that it would be better to spend another $20 to buy a new one because it came in a “new case.” This “new case” would be code for the cheap, plastic-hinged box that the card came in. In addition, she said the customer would save more with a new card “because it was a newer card.”
This, of course, would be a bold-faced lie since a customer receives 10 percent off each item in every transaction regardless of when the card was purchased.
These sorts of sales tactics are embarrassing and more than likely do not truly reflect the mechanical seal company. However, in general the sales push to buy these cards, which are a good deal in some cases, has become annoying and in some cases, bullying. If the company continues to push their sales associates to meet these quotas and demand more from the customer, they are going to end up not having any customers, which was their problem not more than five years ago (although that was due to poor choices of inventory and pricing).
On a recent visit to the mechanical seal store at the Mall of Orange in Orange, CA, one sales associate was so bent on selling a Seal Deal card, she felt compelled to lie about the potential savings.
Outside type mechanical seal device
The invention discloses an outside type mechanical seal device disposing the mechanical seal main body at the atmospheric side so as to stop leak of shaft seal of rotary shaft, comprising an annular stopper ring fixed on the rotary shaft by a setbolt, an annular flange bolted to the fixed side, plural protrusions formed integrally at positions confronting the stopper ring outer circumference in the flange at specified intervals to the outer circumference.
Spacers interposed between the inside of the protrusions and the outer circumference of the stopper ring, and cap bolts detachably driven into the stopper ring through the protrusions and spacers from outside the protrusions, wherein the axial center of rotary shaft of the stopper ring disposed on the rotary shaft is securely positioned in the radial direction and thrust direction, and the entire outside type mechanical seal composed of multiple parts is formed into one integral unit, thereby facilitating the assembling performance.
Mechanical seal devices have been hitherto classified in two types, that is, the inside type mechanical seal having the mechanical seal main body disposed at the fluid side such as liquid and gas, and the outside type mechanical seal having the mechanical seal main body disposed at the atmospheric side, and the inside type mechanical seal has been available in the integrated unit type, whereas the outside type mechanical seal device is not available in the integrated unit type at the present.
Accordingly, in the conventional outside type mechanical seal, it required an experienced skill in assembling the mechanical seal consisting of multiple parts including flange, seat ring, rotary ring, stopper ring, spring, O-ring and others, between the rotary shaft and the fixed side (for example, the stuffing box of the pump), and the assembling performance was poor.
It is hence a primary object of the invention to present an outside type mechanical seal device capable of securely positioning in the radial direction and thrust direction to the axial center of the rotary shaft of the stopper ring disposed on the rotary shaft, integrating the entire mechanical seal composed of multiple parts into one unit, and facilitating the assembling performance.
An outside type mechanical seal device capable of achieving more secure positioning in the radial direction and thrust direction to the axial center of the rotary shaft of the stopper ring disposed on the rotary shaft.
Since the stopper ring can be securely positioned thus in the radial direction and thrust direction, the entire mechanical seal device made of multiple parts can be integrated into a unit.
Therefore, when assembling the mechanical seal device, the integrated unit is assembled between the rotary shaft and the stuffing box of the pump as the fixed side as described below, and the assembling job may be facilitated, so that any particular skill is not needed in assembling.
That is, to assemble the mechanical seal device, to assemble the mechanical seal device, in the first place, the integrated unit of mechanical seal device is inserted into the rotary shaft, and the stuffing box of the pump casing is incorporated. In this state, using the flange bolt not shown from the atmospheric side AI, and using the grooves, the flange bolt is tightened into the screw hole (not shown) of the stuffing box side, and the integrated unit of the mechanical seal device is bolted to the stuffing box.
In short, according to claim of the invention, by the thickness of the plural spacers interposed between the inside of the protrusions and the outer circumference of the stopper ring, the stopper ring disposed on the rotary shaft is positioned in the radial direction to the axial center of the rotary shaft, and the cap bolt penetrates through the spacer to be screwed in the stopper ring, the stopper ring is positioned in the thrust direction (axial direction) to the rotary shaft.
In this way, since the stopper can be positioned securely in both radial direction and thrust direction, the entire mechanical seal composed of multiple parts can be integrated into a unit. Therefore, when assembling the mechanical seal, only the integrated unit may be incorporated between the rotary shaft and the fixed side, and the assembling job may be facilitated, thereby not requiring any particular skill.
Industrial Vacuum Cleaners
Dirt and grime plays a part in our everyday lives. It goes without saying that our offices, streets, vehicles, carpets and factories need to be kept clean in order for them to remain healthy environments to work in. Industrial cleaning equipment is often used for this very purpose.
When it comes to cleaning industrial or commercial premises it is important that you have access to industrial vacuum equipment. If you are going to be vacuuming a large surface area with a large amount of unusual dust or dirt, then a standard home vacuum cleaner will not be able to handle the load.
Choose an industrial vacuum cleaner that will matched up well to the task at hand. Keep reputable and reliable brands in mind such as K?rcher, Sibilia and Numatic.
Industrial vacuum cleaners are specifically designed for industrial cleaning. This make is durable and reliable to clean just about any environment. Some of the ranges are designed for interior and carpet dirt extraction and are also durable and reliable. When looking around for vacuum cleaners to suit the task at hand, chat to professionals in the field and see what they have to say about your options. Seek out dedicated cleaning companies with a good reputation on the market.
Contact your local industrial cleaning company that offers contract cleaning services, the hire of vacuum equipment and other cleaning equipment for DIY use and even the sale of various types of equipment and cleaning aids. There is no job too big or too small.
If you aren’t sure which vacuum equipment you need to purchase for your particular cleaning task, take the time to chat to the professionals who will advise you and ensure that you end up with the right equipment and accessories.
There is wide variety of industrial vacuum systems to consider for your needs, some are:
Fixed vacuum systems – Powerful, compact suction systems create high performance centralised systems. They can be used in all industrial fields. Central Vacuum Units Filter Hoppers Truck mounted units – Powerful and versatile Truck and trailer mounted units & more… Also available are customised vacuum projects
Services:
Industrial vacuum cleaners can clean the toughest places:
elevator pits aluminium industry anode paste plants bauxite handling systems boiler house cement dust cement mills cement plant packing house cement plants coal handling plants crusher house vacuum cleaning of ports vacuum cleaning of lime plants and more…