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قديم منذ /21-09-2019, 06:10 PM   #1

كمال رامي
 
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 رقم العضوية : 70540
 تاريخ التسجيل : 21 - 12 - 2018
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افتراضي البرشاء الثالثة لإصلاح الغسالات في دبي

<*iv align="left">Al Barsha Thir* Dubai Washing Machine Repair



Front-loa*ing
The front-loa*ing or horizontal-axis clothes washer is the *ominant *esign in Europe. In the U.S. an* elsewhere, most "high-en*" washing machines are of this type. In a**ition, most commercial an* in*ustrial clothes washers aroun* the worl* are of the horizontal-axis *esign.
This layout mounts the inner basket an* outer tub horizontally, an* loa*ing is through a *oor at the front of the machine. The *oor often but not always contains a transparent win*ow. Agitation is supplie* by the back-an*-forth rotation of the cylin*er an* by gravity. The clothes are lifte* up by pa**les on the insi*e wall of the *rum an* then *roppe*. This motion flexes the weave of the fabric an* forces water an* *etergent solution through the clothes loa*. Because the wash action *oes not require the clothing be freely suspen*e* in water, only enough water is nee*e* to moisten the fabric. Because less water is require*, front-loa*ers typically use less soap, an* the repeate* *ropping an* fol*ing action of the tumbling can easily pro*uce large amounts of foam or su*s. [فقط الأعضاء المسجلين والمفعلين يمكنهم رؤية الوصلات . إضغط هنا للتسجيل]
Front-loa*ers control water usage through the surface tension of water, an* the capillary wicking action this creates in the fabric weave. A front-loa*er washer always fills to the same low water level, but a large pile of *ry clothing stan*ing in water will soak up the moisture, causing the water level to *rop. The washer then refills to maintain the original water level. Because it takes time for this water absorption to occur with a motionless pile of fabric, nearly all front-loa*ers begin the washing process by slowly tumbling the clothing un*er the stream of water entering an* filling the *rum, to rapi*ly saturate the clothes with water.
Front-loa*ing washers are mechanically simple compare* to top-loa*ers, with the main motor (a universal motor or variable-frequency *rive motor) normally being connecte* to the *rum via a groove* pulley belt an* large pulley wheel, without the nee* for a gearbox, clutch or crank. But front-loa* washers suffer from their own technical problems, *ue to the *rum lying si*eways. For example, a top loa*ing washer keeps water insi*e the tub merely through the force of gravity pulling *own on the water, while a front-loa*er must tightly seal the *oor shut with a gasket to prevent water *ripping onto the floor *uring the wash cycle. This access *oor is locke* shut *uring the entire wash cycle, since opening the *oor with the machine in use coul* result in water gushing out onto the floor. For front-loa*ers without viewing win*ows on the *oor, it is possible to acci*entally pinch fabric between the *oor an* the *rum, resulting in tearing an* *amage to the pinche* clothing *uring tumbling an* spinning.
Nearly all front-loa*er washers for the consumer market also use a fol*e* flexible bellows assembly aroun* the *oor opening, to keep clothing containe* insi*e the basket *uring the tumbling wash cycle. If this bellows assembly were not use*, small articles of clothing such as socks coul* slip out of the wash basket near the *oor, an* fall *own the narrow slot between the outer tub an* basket, plugging the *rain an* possibly jamming rotation of the inner basket. Retrieving lost items from between the outer tub an* inner basket can require complete *isassembly of the front of the washer an* pulling out the entire inner wash basket. Commercial an* in*ustrial front-loa*ers use* by businesses (*escribe* below) usually *o not use the bellows, an* instea* require all small objects to be place* in a mesh bag to prevent loss near the basket opening.
The bellows assembly aroun* the *oor is a potential source of problems for the consumer front-loa*er. The bellows has a large number of flexible fol*s to permit the tub to move separately from the *oor *uring the high spee* extraction cycle. On many machines, these fol*s can collect lint, *irt, an* moisture, resulting in mol* an* mil*ew growth, an* a foul o*or. Some front-loa*ing washer operating instructions say the bellows shoul* be wipe* *own monthly with a strong bleach solution, while others offer a special "freshening" cycle where the machine is run empty with a strong *osing of bleach. [فقط الأعضاء المسجلين والمفعلين يمكنهم رؤية الوصلات . إضغط هنا للتسجيل]
The inherent mechanical weak spot of the front loa*er *esign is the cantilevere* mounting of the inner *rum within the outer tub. The *rum bearing has to support the entire weight of the *rum, the laun*ry, an* the *ynamic loa*s create* by the sloshing of the water an* of the imbalance of the loa* *uring the spin cycle. The *rum bearing eventually wears out, an* usually requires extensive *ismantling of the machine to replace, which often results in the machine being written off *ue to the failure of a relatively inexpensive component that is labor-intensive to renew. Some manufacturers have compoun*e* this problem by "overmol*ing" the *rum bearing into the outer tub to re*uce manufacturing costs, but this makes the bearing impossible to renew without replacing the entire outer tub - which usually forces owners to scrap the entire machine - this may be viewe* as an implementation of built-in obsolescence.
Compare* to top-loa*ing washers, clothing can be packe* more tightly in a front loa*er, up to the full *rum volume if using a cottons wash cycle. This is because wet cloth usually fits into a smaller space than *ry cloth, an* front loa*ers are able to self-regulate the water nee*e* to achieve correct washing an* rinsing. Extreme overloa*ing of front-loa*ing washers pushes fabrics towar*s the small gap between the loa*ing *oor an* the front of the wash basket, potentially resulting in fabrics lost between the basket an* outer tub, an* in severe cases, tearing of clothing an* jamming the motion of the basket.


[IMG]http://www.m9c.net/uploa*s/156897690310.jpg[/IMG]




Variant an* hybri* *esigns
There are many variations of the two general *esigns. Top-loa*ing machines in Asia use impellers instea* of agitators. Impellers are similar to agitators except that they *o not have the center post exten*ing up in the mi**le of the wash tub basket. [فقط الأعضاء المسجلين والمفعلين يمكنهم رؤية الوصلات . إضغط هنا للتسجيل]
Some machines which actually loa* from the top are otherwise much more similar to front-loa*ing horizontal-axis *rum machines. They have a *rum rotating aroun* a horizontal axis, as a front-loa*er, but there is no front *oor; instea* there is a liftable li* which provi*es access to the *rum, which has a hatch which can be latche* shut. Clothes are loa*e*, the hatch an* li* are close*, an* the machine operates an* spins just like a front-loa*er. These machines are narrower but usually taller than front-loa*ers, usually have a lower capacity, an* are inten*e* for use where only a narrow space is available, as is sometimes the case in Europe. They have inci*ental a*vantages: they can be loa*e* without ben*ing *own; they *o not require a perishable rubber bellows seal; an* instea* of the *rum having a single bearing on one si*e, it has a pair of symmetrical bearings, one on each si*e, avoi*ing asymmetrical bearing loa*ing an* potentially increasing life. This type of washing machine is popular in Europe, where space is limite*, as a washer can be as little as 40 cm wi*e, an* a full washer an* *ryer installation can be as little as 80 cm wi*e.
There are also combo washer *ryer machines that combine washing cycles an* a full *rying cycle in the same *rum, eliminating the nee* to transfer wet clothes from a washer to a *ryer machine. In principle, these machines are convenient for overnight cleaning (the combine* cycle is consi*erably longer), but the effective capacity for cleaning larger batches of laun*ry is *rastically re*uce*. The *rying process ten*s to use much more energy than using two separate *evices, because a combo washer *ryer not only must *ry the clothing, but also nee*s to *ry out the wash chamber itself. These machines are use* more in Europe, because they can be fitte* into small spaces, an* many can be operate* without *e*icate* utility connections. In these machines, the washer an* *ryer functions often have *ifferent capacities, with the *ryer usually having the lowest capacity. These machines shoul* not be confuse* with a *ryer on top of a washer installation, or with a laun*ry center, which is a one piece appliance offering a compromise between a washer-*ryer combo an* a full washer to the si*e of the *ryer installation or a *ryer on top of a washer installation. Laun*ry centers usually have the *ryer on top of the washer, with the controls for both machines being on a single control panel. Often, the controls are simpler than the controls on a washer-*ryer combo or a *e*icate* washer an* *ryer.
Comparison
True front-loa*ers, an* top-loa*ing machines with horizontal-axis *rum as *escribe* above, can be compare* with top-loa*ers on a number of aspects:

  • Efficient cleaning: Front-loa*ers usually use less energy, water, an* *etergent compare* to the best top-loa*ers. "High Efficiency" washers use 20% to 60% of the *etergent, water an* energy of "stan*ar*" washers. They usually take somewhat longer (20-110 minutes) to wash a loa*, but are often computer controlle* with a**itional sensors, to a*apt the wash cycle to the nee*s of each loa*. As this technology improves, the human interface will also improve, to make it easier to un*erstan* an* control the many *ifferent cleaning options.
  • Water usage: Front-loa*ers usually use less water than top-loa*ing resi*ential clothes washers. Estimates are that front-loa*ers use from one thir* to one half as much water as top-loa*ers.
  • Spin-*ry effectiveness: Front-loa*ers (an* European horizontal axis top loa*ers an* some front loa*ers) offer much higher maximum spin spee*s of up to 2000 RPM, although home machines ten* to be in the 1000 to 1400 RPM range, while top-loa*ers (with agitators) *o not excee* 1140 RPM. High-efficiency top-loa*ers with a wash plate (instea* of an agitator) can spin up to 1100 RPM, as their center of gravity is lower. Higher spin spee*s, along with the *iameter of the *rum, *etermine the g-force, an* a higher g-force removes more resi*ual water, making clothes *ry faster. This also re*uces energy consumption if clothes are *rie* in a clothes *ryer.
  • Cycle length: Top-loa*ers have ten*e* to have shorter cycle times, in part because their *esign has tra*itionally emphasize* simplicity an* spee* of operation more than resource conservation.
  • Wear an* abrasion: Top-loa*ers require an agitator or impeller mechanism to force enough water through clothes to clean them effectively, which greatly increases mechanical wear an* tear on fabrics. Front-loa*ers use pa**les in the *rum to repeate*ly pick up an* *rop clothes into water for cleaning; this gentler action causes less wear. The amount of clothes wear can be roughly gauge* by the amount of accumulation in a clothes *ryer lint filter, since the lint largely consists of stray fibers *etache* from textiles *uring washing an* *rying.
  • Difficult items: Top-loa*ers may have trouble cleaning large items, such as sleeping bags or pillows, which ten* to float on top of the wash water rather than circulate within it. In a**ition, vigorous top-loa*er agitator motions may *amage *elicate fabrics.
  • Noise: Front-loa*ers ten* to operate more quietly than top-loa*ers because the *oor seal helps contain noise, an* because there is less of a ten*ency to imbalance. Top-loa*ers usually nee* a mechanical transmission (*ue to agitators, see above), which can generate more noise than the rubber belt or *irect *rive foun* in most front loa*ers.
  • Compactness: True front-loa*ing machines may be installe* un*erneath counter-height work surfaces. A front-loa*ing washing machine, in a fully fitte* kitchen, may even be *isguise* as a kitchen cabinet. These mo*els can also be convenient in homes with limite* floor area, since the clothes *ryer may be installe* *irectly above the washer ("stacke*" configuration).
  • Water leakage: Top-loa*ing machines are less prone to leakage, because simple gravity can reliably keep water from spilling out the loa*ing *oor on top. True front-loa*ing machines require a flexible seal or gasket on the front *oor, an* the front *oor must be locke* *uring operation to prevent opening, lest large amounts of water spill out. This seal may leak an* require replacement. However, many current front-loa*ers use so little water that they can be stoppe* mi*-cycle for a**ition or removal of laun*ry, while keeping the water level in the horizontal tub below the *oor level. Best practice installations of either type of machine will inclu*e a floor *rain or an overflow catch tray with a *rain connection, since neither *esign is immune to leakage or a solenoi* valve getting stuck in the open position.
  • Maintenance an* reliability: Top-loa*ing washers are more tolerant of maintenance neglect, an* may not nee* a regular "freshening" cycle to clean *oor seals an* bellows. During the spin cycle, a top-loa*ing tub is free to move about insi*e the cabinet of the machine, using only a lip aroun* the top of the inner basket an* outer tub to keep the spinning water an* clothing from spraying out over the e*ge. Therefore, the potentially problematic *oor-sealing an* *oor-locking mechanisms use* by true front-loa*ers are not nee*e*. On the other han*, top-loa*ers use mechanical gearboxes that are more vulnerable to wear than simpler front-loa* motor *rives.
  • Accessibility an* ergonomics: Front-loa*ers are more convenient for very short people an* those with paraplegia, as the controls are front-mounte* an* the horizontal *rum eliminates the nee* for stan*ing or climbing. Risers, also referre* to as pe*estals, often with storage *rawers un*erneath, can be use* to raise the *oor of a true front-loa*er closer to the user's level.
  • Initial cost: In countries where top-loa*ers are popular, front-loa*ers ten* to be more expensive to buy than top-loa*ers, though their lower operating costs can ultimately lea* to lower total cost of ownership, especially if energy, *etergent, or water are expensive. On the other han*, in countries with a large front-loa*er user base, top-loa*ers are usually seen as alternatives an* more expensive than basic off-bran* front loa*ers, although without many *ifferences in total cost of ownership apart from *esign-originate* ones. In a**ition, manufacturers have ten*e* to inclu*e more a*vance* features such as internal water heating, automatic *irt sensors, an* high-spee* emptying on front-loa*ers, although some of these features coul* be implemente* on top-loa*ers.






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