Laboratory Exercise: Vacuum Cleaner
Hello everyone, welcome back! So this is the 6th laboratory session that we are having in theFunctional and Conceptual Design course, in every lab course what we are trying do is tolook at our theory, whatever you learnt in the theory and then see how we can implement thatfor a product in the lab or at least practically how can we use those principles for redesigninga product. Hello everyone welcome back, so this is the 6th laboratory session that we arehaving in the Functional and Conceptual Design course, in every lab course what we aretrying do is to look at our theory, whatever you learnt in the theory and then see how we canimplement that for a product in the lab or at least practically how can we use those principlesfor redesigning a product.This is what we have been doing, for the last few sessions. So, in the session also we will doa similar exercise, this time the product will be a vacuum cleaner. Most of you will be awareof this product. So, most of you will be aware about this product vacuum cleaner, you mighthave used this, you must be having this at home, or might have seen somebody using thisproduct.So, as usual we will do the dissection of the product, try to identify all the main functions ofthe product and then try to get all the parts identified and then look at each part finding howthis part is contributing to the main function of the product. But, as an exercise to reinforceour theoretical learning we will be doing the exercise of preparing a house of quality, andtechnical specification for this product.If you want to redesign this product, and you know the customer needs or you can identifythe customer needs, how do we use these needs in order to develop the house of quality, andtechnical specification for the product? And you know what is a house of quality, and youknow what technical specification is.So, a technical specification is basically to convert the subjective needs of the customer to anobjective value and then use this information in the house of quality in order to compare theproducts, existing products with the products you want to design and then see, what should bethe target values for this technical specification.So, the house of quality will give you the target values for specification; it will help you tocompare the products in the market and benchmark the products in the market and as well asit will help you to identify the technological conflicts and the challenges that you may face indesigning the product so, this is what is going to be done in this experiment.(Refer Slide Time: 02:42)So, the objectives as in the previous cases, the 3 will be the first 3 will be the samefunctioning of the product, parts, parts list, assembly chart, so, then for some of the identifiedneeds you prepare the needed metric chart. So, you need to identify the metrics correspondingto each need and then, prepare a need metric chart showing the dependency of these metricswith the needs.So, what, which are the needs associated with the corresponding metrics and how they arerelated, whether there is a strong relation or a weak relation need to be identified. So, that isbasically the need metric chart, so you need to prepare the need metric chart. And then thenext stage is basically to, the next step is to prepare the house of quality and in order toprepare the house of quality, what you need to do is, to identify the give the benchmarkingvalues, get the benchmarking values, from the products which are available in the market as agroup you can work on this.Identify the benchmarking values, and how the products are satisfying the market a currently.What kind of satisfaction they are providing whether they are highly satisfied or lesssatisfied, can be identified and based on that and their metrics the values of the metric theyuse. You can identify the target values.So at the end of this session, you will be getting the metric and the target values that actuallybecomes the design specification for the product. So, at the end of this need a metric chartand house of quality, you should be able to specify the product or you should be able to getthe product specification in terms of the metrics and values.For example, what should be the weight of the product or what should be the temperature atwhich it should be heated or what should be the time it should take to get the particulartemperature, so those things should be specified and that becomes the design specification forthe product. So, this is what is expected from you in analysing this product.(Refer Slide Time: 04:51)Okay so, if you look at the product as such you will see that the product is actually thevacuum cleaner and brand is Forbes and the model is Easy Clean.(Refer Slide Time: 04:60)And if you look at the major functions you can see in this product, one of the main function isto collect the dust from the surface whether it is a carpet or a floor or a cushion, you need tocollect that dust and it is not that just collect dust you need to store it also, you cannot simplythrow it out, so you need to have some mechanism to store the dust for which you need togenerate vacuum.So, how do you collect the dust? We need to generate the vacuum. And an additional functionthat most of the vacuum cleaners will be having is a blowing option that you can actuallyblow air, so in order to do that you need to generate some pressure and to blow the air. So,these are the main functions that the product is doing.Now you need to see how the different parts in the product are enabling these functions orsupporting these functions, so that is what one needs to do in the exercise. So, the procedureis almost the same as before sessions and here we do not do the functional decomposition forthe time being. We will be doing only the house of quality that is what is added in thisparticular exercise. So, please do the need identification house of quality for this product.(Refer Slide Time: 06:24)So, this is the format and again as I told you, we will be doing this later, so in this exercise wewill be doing the need metric.(Refer Slide Time: 06:42)So, as you know we will be doing the product dissection procedure then you have the part listthen you have the assembly chart and then this is common for all the reports and after thisyou will be looking at the needed metric chart. So as I told you, you need to prepare theneeded metric chart and then show it in your reports and then you need to have a house ofquality.So, all of you know how to prepare the house of quality diagram, provide all the informationwhatever is available with you and whatever you can actually, if we are assuming some data,you can actually mention that in the report and prepare the house of quality and based on thisspecify what the specification for the product is.So, this is what is expected from you in the report. I hope it is clear to you so, you can go tothe technical assistant, he will be helping you with the product and the product dissection andthen this part, need a metric chart, house of quality and product specifications to be done byyou as a group and then prepare the report and submit. Okay, yes, thank you very much.(Refer Slide Time: 07:54)So today we will be looking at a vacuum cleaner. The main purpose of a vacuum cleaner is toclean the households, domestic areas, small households, small places and it is not used for(domestics) like commercial purposes.(Refer Slide Time: 08:13)So, the first component that we will be looking at is the brush. So there are various brushesavailable for different purposes. This one is the crevice brush or corner brush which can beused for cleaning the corners.(Refer Slide Time: 08:24)Whereas this is nothing but the extension or the extension hose. This is used for extending thereach of the vacuum cleaner. Suppose you want to reach places where you cannot easily getthe vacuum cleaner tool, you can use this to reach that.(Refer Slide Time: 08:40)This is nothing but the floor or carpet cleaning brush. The purpose of this is that once youplace it on the floor, rub it so the bristles over here will disengage the dust and that will getattracted through this place and that will go inside the vacuum cleaner. So in order to use thiswe need to use this extension rod, the purpose of this extension rod is similar to the flexiblehose just to increase the reach .(Refer Slide Time: 09:06)So, another brush that we have got is a posture brush. The purpose of this brush is rather touse for cleaning sofas, cushions, and the bristles. The design of the bristles are such that it caneasily remove the dust and that will get attracted through the hole. About the power cord ofthis product, which connects to the 3-pins socket, the traditional 3-pin socket 230 Volt 50Hertz and on the other end we have got the on off switch which can be seen over here, andthen the other end goes to the motor.(Refer Slide Time: 09:46)So, before we dissect this product, there is this additional component you can see. Thisproduct is not just a vacuum cleaner it also acts as a blower. So, what you can do is in someplaces the vacuum cleaner might not be able to create enough suction pressure.(Refer Slide Time: 10:06)So, what we do is we use this, remove this component from the back and attach this, so nowthis vacuum cleaner can be used as a blower. So initially you can see this component which isthe rear filter cover. So the purpose of this component is to remove the exhaust gas, the airthey get sucked in from here, however when we remove this and put this.(Refer Slide Time: 10:33)So, this is nothing but the blower end so now the vacuum cleaner acts as a blower and air getsblown out from this end so this can be used to remove the hard dust that is very sticky on thesurface and later on you can easily attract it to the vacuum cleaner. So, that was the purposeof the blower.(Refer Slide Time: 10:54)So, the first component over here is nothing but the dust cup, the purpose of this is to attractthe dust from this nozzle and store it in this rear, the filter cup. So this is nothing but the dustbag or the dust filter which stores the dust and this is the dust cup.(Refer Slide Time: 11:15)Now this is nothing but, the shoulders trap a shoulders trap is basically for easy carrying ofthe product. So we cannot keep lifting the product for a long time that may cause hand-acheso we can use this shoulder trap for hanging this vacuum cleaner in our shoulders and thatwill give more comfort.(Refer Slide Time: 11:41)So, this is the main heart of the vacuum cleaner, now this component, the outer component isknown as the housing. This is the right housing, this is the left housing. In order to separate ityou have just to pull this apart and we can keep it over here, and inside you have got a motorso we will be looking at the motor in a while.So, we will remove this and give it, the motor generates heat basically. So the design of thehousing is such that the heat generated from the motor expels easily. We can look at how thegrooves are made, there are projections at a lot of places, so the design has taken the motorheating into consideration before making changes. So, that was the housing, yes one morething.(Refer Slide Time: 12:37)So, this component is the dust cup release button. When you want to pull this part initially,the component, you have to press this button such that this mechanism will come outautomatically. Otherwise this is nothing but a snap fit which is basically you just attach it andpush it so that it will get go and snapped, get snapped with the housing part.So, that was the dust cup and this was the dust cup release button.(Refer Slide Time: 13:25)Okay so now we will be looking at the motor. So, before we go to the motor as you can see,this is inside, this is nothing but the impeller. So this looks like a fan and actually it is not afan, so in a traditional fan, the fin design if you can see the purpose of the fins is to blow airwhereas in an impeller the purpose is to create vacuum and because of it air gets sucked in.So, this is the impeller and this is the impeller housing.(Refer Slide Time: 13:49)On top of it we have the motor so, this is nothing but the universal motor or also known asthe serial motor, so it can work on both AC as well as DC but the input that we will be givinghere is AC. So, that is why we have got a laminated stator, so I will be explaining now.(Refer Slide Time: 14:09)So, this is the stator as you can see this iron part is nothing but the stator. This is the copperwinding and these are the commutator and the central part is a rotor which is mounted on thisshaft and there is a bearing, so this is nothing but the simple motor and it basically works onFleming's right hand rule, left hand rule sorry.So basically how it works is that change in flux generates a force which drives the shaft andthat rotates the impeller. So, that is the working of the vacuum cleaner. So, I think we havecompleted going over the main components of the vacuum cleaner.(Refer Slide Time: 14:55)
Okay so, this was the product we looked at. It is a vacuum cleaner used for cleaning ourhouseholds for domestic purposes; there are several types, the evolution of vacuum cleanershappened in the 1800s where people could not be able to clean the dust manually because ofthe manual effort required. So, the vacuum cleaner was invented.Initially it was of a larger size, now it has evolved to a compact one now, this product has asome flaws as well for example, even though it is compact it is quite heavy, it is difficult tocarry and one more thing in case of power failure we cannot use this product because weneed electrical current. So, instead of that we can put rechargeable batteries inside thisproduct which can increase the flexibility as well. And one more thing the product makesquite a bit of noise so, we can put some noise deadening materials to reduce the NBH levelsthat are being generated by the product. So, that is it.
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