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Blower Vanes

02/06/2021 2:44 PM

As seen here there are mainy three types of impellers for a Blower.

The Radial type I had in a wood shop to suck up the sawdust and planer shavings from a large planer.

Now what is the difference in performance of just plain air, No dirt or anything, but why do they make the forward or backward, what is the difference performance wise? Everything staying the same RPM's diamater, # of vanes etc.

Thanks Everyone!

Joe

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#1

Re: Blower Vanes

02/06/2021 3:10 PM

The forward facing blades I think move the most air, it is the design used in most air handlers...

https://www.engineeringtoolbox.com/fan-types-d_142.html

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#2
In reply to #1

Re: Blower Vanes

02/06/2021 3:22 PM

Thanks Eagle,

Hmmm, so If I took one that has backwards blades, and bent them to be forward blades, the curve might be wrong, but the airflow probably still should be better.

I'm the one that changed that plastic wheel that kept braking with a metal one everyone was suggesting. It works but the airflow is not as much as it used to be, the plastic one was forward this metal is backwards UG!

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#4
In reply to #2

Re: Blower Vanes

02/06/2021 5:24 PM

The blades are likely to break if you try bending them...

https://www.blowerwheel.com/blower-wheels

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#5
In reply to #4

Re: Blower Vanes

02/06/2021 5:44 PM

Need 1/2" Bore, 8" dia, 3" width, CCW rotation. dont seem to find that.

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#6
In reply to #5

Re: Blower Vanes

02/06/2021 8:02 PM
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#7
In reply to #6

Re: Blower Vanes

02/06/2021 10:19 PM

You are awesome dude, This one seems really close, I'll measure the housing But I think it will fit. Funny it says for CW rotation, But if I rotate it CCW then the Blades are what we want, if the image is really the unit?

https://surpluscityliquidators.com/products/3-18-8-dia-cw-blower-wheel-12-bore.html?29417

This is for an electric Dryer.

Now I'm trying to also find a small rubber wheel type of roller like this,

with a 1 to 1.5 inch diameter and ball bearing axle.

These support the rotating drum of the dryer.

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#9
In reply to #8

Re: Blower Vanes

02/06/2021 10:36 PM

Both of those look like they might work, but there are no spec's like sizes etc. UG,

So I can see if my current mountings will work or not.

I added a pair like these,

But it had no bearings, and the center hole wore out in like a month to like double it's original size. So tyying to find a wheel like you showed. mught fit but no dimentions. UG

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#10
In reply to #9

Re: Blower Vanes

02/07/2021 2:21 AM

Well you need the brand and model number to be sure, but there seem to be only a few different kinds, the ones I showed were for commercial machines, residential type look more like the roller skate wheels....

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#13
In reply to #10

Re: Blower Vanes

02/07/2021 9:34 AM

Hi Solar,

Actually those you pictured are what looks like that support the rear of the drum. And those are fine. The front of the drum, never had wheels at all. the front support was just some hard plastic. The the drum just slid on. So when they wore out, I made the roller modification with some small like 1" dia wheels, It worked GREAT! Made the dryer almost totally silent. But the non bearing type of just rubber on the axel, couldn't take the RPM's and the friction, and the bore would just get twice the size of the shaft he he he.

So size, of what make & model do you need really is an issue. because there really isn't any. he he he

Joe

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#19
In reply to #13

Re: Blower Vanes

02/08/2021 5:31 PM

My 1989 Maytag dryer has cork bearings for the front of the drum. It's interesting to note that the ball bearings for the wheels on the back of the drum wore out well before the cork bearings.

I replaced them all since I had it apart anyways and put a new belt on at the same time for good measure. After 20+ plus years of use raising four kids. Still in regular use today.

They're going to have pry my old-school Maytags out of my cold, stiff fingers.

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#20
In reply to #19

Re: Blower Vanes

02/08/2021 6:22 PM

This here is a Crosley, Bought used like 1996 or so, Google says Crosley Driers were made by Whirlpool.

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#21
In reply to #20

Re: Blower Vanes

02/08/2021 8:24 PM

With that knowledge, you might be able to find form, fit, function OEM replacements. Even today. I wonder if there is a way to cross-reference your Crosley to a Whirlpool model?

I can still buy the majority of the parts for my washer and dryer. Some big items like the drum or big sheet metal parts, no, but most of the 'wear' items are still available. I put a new gearbox in my old washer a few years back for about $200 in parts and my labor.

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#22
In reply to #21

Re: Blower Vanes

02/08/2021 11:12 PM

What I am trying to make if I can find the O ring is not even in the original design. The rear of the drum is on what looks just like roller skate wheels, the front of the drum just slid on plastic pads.

Thought I'd make some rollers for the front.

Joe

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#26
In reply to #22

Re: Blower Vanes

02/09/2021 3:16 PM

Have you tried looking at this website?

https://www.partselect.com/Crosley-Dryer-Parts.htm

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#28
In reply to #26

Re: Blower Vanes

02/09/2021 3:35 PM

This won't be any part there because it does not even exist yet.

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#30
In reply to #20

Re: Blower Vanes

02/10/2021 1:25 PM

Powel Crosley jr. built all sorts of stuff, including cars, mainly in the 30's, 40's and 50's...He was responsible for a lot of firsts, and was innovative and prolific....the company was probably sold to Whirlpool at some point in the late 50's or early 60's when he died..

https://en.wikipedia.org/wiki/Powel_Crosley_Jr.

https://www.macsmotorcitygarage.com/americas-first-sports-car-the-crosley-hotshot/

..."In the 1930s Crosley added refrigerators and other household appliances and consumer goods to his company's product line. Because he had invested in his own businesses instead of the stock market, Crosley was better able than many other industrialists to keep his employees working and his products available to the public during the Great Depression.[14]

Crosley's "Icyball" was an early non-electrical refrigeration device. The unit used an evaporative cycle to create cold, and had no moving parts. The dumbbell shaped unit was "charged" by heating one end with a small kerosene heater. Crosley's company sold several hundred thousand Icyball units before discontinuing its manufacture in the late 1930s.[citation needed]

In 1932 Crosley had the idea of putting shelves in the doors of refrigerators. He patented the "Shelvador" refrigerator and launched the new appliance in 1933. At that time it was the only model with shelves in the door.[16] In addition to refrigerators, Crosley's company sold other consumer products that included the "XERVAC," a device purported to "revitalize inactive hair cells" and "stimulate hair growth".[23] Crosley also introduced the "Autogym," a motor-driven weight-loss device with a vibrating belt, and the "Go-Bi-Bi," a "rideable baby walker," among other products.[24]"...

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#24
In reply to #19

Re: Blower Vanes

02/09/2021 7:24 AM

We had a whirlpool dryer for 25+ years.It was so well worn that the inside had a chrome finish.I originally had a speckled enamel coating,but it was long gone.

I replaced the belt and idler bearing about every 5 years,and that was it.

The front velvet bearing never wore out.

A coin fell onto the motor winding and shorted out the motor.Replaced the motor,and off to the races for another 12 years.

My kids grew up,and left the nest,and we remodeled.

Old reliable was replaced with a Maytag because it has all of the bells and whistles that my wife wanted.

BIG Mistake.

I will not go into details but we both wished for the old one back.

"They don't make em like they used to." is an old saw,but true.

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#27
In reply to #24

Re: Blower Vanes

02/09/2021 3:26 PM

That's exactly right. They don't make them like they used to. My wife purchased a set of Whirlpool high efficiency units for the upstairs a few years back but we still have the venerable work-horse Maytags in the first floor laundry. (She wanted her own units in the bedroom for her convenience, not anyone else's.) My son wanted our 'old' Maytags when he moved out. I told him no way. Non-negotiable.

We have a leaking issue with the 'new' Whirlpool washer already. Ugh. The door seal sucks. Cleaned it carefully, tried a number of things, but it always seems to drool out a little bit liquid detergent down the front. Not water, just detergent. Frustrating piece of crap.

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#12
In reply to #2

Re: Blower Vanes

02/07/2021 5:13 AM

Please note that if you work with a forward bent fan of traditional design with longer blades you will find out to have for one pressure setting up to 3 working points with different flow rate!

regards Josef

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#15
In reply to #2

Re: Blower Vanes

02/08/2021 8:33 AM

maybe you purchased the wrong fan? maybe the one you purchased is for a motor that blows counter clockwise?

I cannot see a reason to have blades that face the opposite direction for air flow?

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#17
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Re: Blower Vanes

02/08/2021 1:48 PM

Bear in mind that reverse curved blades are almost universally used in this application because of dust accumulation....on forward curved blades dust and dirt tend to accumulate on the inside curve of the blades, a poor design choice in this application...and straight blades are usually run at higher rpm's to be effective....they do make booster fans for long dryer runs....blades

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#3

Re: Blower Vanes

02/06/2021 4:01 PM

The pressure vs volume curves are different for the three blade configurations. Each type has advantages and disadvantages as shown in the table from this document.

Table 2.1. Characteristics of different centrifugal fans

Type of fanApplicationsAdvantagesDisadvantages
Radial

(1)

Industrial/mining/petrochemical


(2)

Dust extraction applications


(3)

High-pressure applications


(1)

Suitable for high static pressures and high temperatures


(2)

Simple design allows custom-build units for special applications


(3)

Can operate at low air flows without vibration problems


(4)

High durability


(5)

Have large running clearances, which is useful for airborne solids (dust, wood chips and metal scraps) handling services

Only suitable for low–medium airflow rates
Forward curved

(1)

HVAC/industrial


(2)

Clean air supply & and extraction


(1)

Can move large air volumes against relatively low pressure


(2)

Relative small size


(3)

Low noise level (due to low speed) and well suited for residential heating, ventilation, and air-conditioning (HVAC) applications


(1)

Only suitable for clean service applications but not for high pressure and harsh services


(2)

Fan output is difficult to adjust accurately


(3)

Driver must be selected carefully to avoid motor overload because power curve increases steadily with airflow


(4)

Relatively low energy-efficiency (55–65%)

Backward inclined

(1)

HVAC/industrial


(2)

Clean air supply and extraction


(1)

Can operate with changing static pressure (as this does not overload the motor)


(2)

Suitable when system behaviour at high air flow is uncertain


(3)

Suitable for forced-draft services


(4)

Flat-bladed fans are more robust


(5)

Curved-bladed fans are more efficient (exceeding 85%)


(6)

Thin air-foil bladed fans are most efficient


(1)

Not suitable for dirty air streams (as fan shape promotes accumulation of dust)


(2)

Airfoil bladed fans are less stable because of staff as they rely on the lift created by each blade


(3)

Thin airfoil bladed fans subject to erosion

Aerofoil blades

(1)

Industrial/mining/petrochemical


(2)

Clean air supply and


(3)

extraction


(1)

High efficiencies (85–90%)


(2)

High volume and medium to high pressure


(3)

(3) Non-overloading characteristics


(1)

Extremely high labour input to manufacture

https://www.sciencedirect.com/topics/engineering/centrifugal-fan

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#11

Re: Blower Vanes

02/07/2021 3:00 AM

Hallo Joe, the forward bent is the standard delivering air with low pressure but is suiteable for most applications in ventilation service.

A special fan wheel design is starting forward and ending radial, that is for low to medium dust loaded air.

backwards bent or even straight backwards is for all kinds of high duty ventilation, high suction as well as discharge pressure. This type with all variations in the ration of inside/discharge diameter as well as open discharge area is showing the vary broad range of service.

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#14

Re: Blower Vanes

02/07/2021 11:25 AM

There was a time that the fan body was cast and made out of 3 parts. The part that goes on the motor, the outlet spout was an assembly by itself and then there was a input duct at 45 degrees that could also be connected to a pipe. They assembly screws was 6 spaced in such a way that you could have 6 different directions for output. If you switch the assembly around you could have another 6 but need a backwards curved vane fan and a motor running reverse. I do not think that it was ever made to be used as a air mixer by using it in its backwards curved mode. Just my opinion. Makes no sense to use it like that.

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#16

Re: Blower Vanes

02/08/2021 10:44 AM

Sirocco Austria (this company does not exist anmore) had designed a "transport" fan which I offered together with a hydraulic motor for dedusting in coal cutting applications in mines in Australia. This BSB type has forward bent inlet and absolutely radial outlet. By reducing the "tongue" distance I was able to gain a higher discharge pressure then the standard design.

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#18

Re: Blower Vanes

02/08/2021 1:57 PM

Ok got the rollers somewhat figured out. I just bought two of these.

It is the roller for a super heavy thermopane patio door! only two of them hold up hundreds of pounds. Has ball bearings etc. surely can handle the like 10 pounds of the dryer drum.

Now my thought is to add a thick heavy "O" Ring to the groove to make a rubber tire so to speak. The groove is 1/4" wide and the OD of the bottom of the groove is 1" so an "O" Ring that is like 1/4" ring material and 7/8" ID should make a perfect "Tire"

but I can not seem to find any even close to that.

anyone?

Joe

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#23
In reply to #18

Re: Blower Vanes

02/09/2021 12:16 AM

You need a higher temp tire material, rubber might create a sticky situation...also the duty cycle for the bearing doesn't seem proper....

https://www.pooleyinc.com/pdf/Common%20Properties%20of%20Rubber%20Elastomers.pdf

https://www.reviewed.com/laundry/features/how-hot-does-a-dryer-get-too-hot-for-most

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#29
In reply to #23

Re: Blower Vanes

02/10/2021 9:54 AM

for high temperature uses, go with Viton o-rings

"High temperature service limits are generally considered to be: 3,000 hr at 232°C (450°F) 1,000 hr at 260°C (500°F) 240 hr at 288°C (550°F) 48 hr at 316°C"

Viton® Selection Guide (rainierrubber.com)

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#25
In reply to #18

Re: Blower Vanes

02/09/2021 7:38 AM

Buy an O Ring splicing kit and roll stock and make your own.I have had great success using these kits.

There is also a large selection of pre-made o-ring kits on line,so search for them.

Here is one link to get you started:

https://www.theoringstore.com/pdfs/O-ring_Size_Chart.pdf

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#31

Re: Blower Vanes

02/12/2021 1:24 PM

I want to thank EVERYONE in this forum for their assistance on my project!

It was a total success! The Dryer is now soo quiet you hardly even know it's running now!

Thank You All!

Joe

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#32

Re: Blower Vanes

02/13/2021 11:20 AM

Roller Project UP-Date,

Well, While those Sliding Patio Door rollers are made to handle heavy loads, like 200 pounds. I guess they are made for intermittent duty at reasonable slow RPM's.

Only supporting maybe 10 pounds, it was only one dryer load, and the dryer was noticeably louder already. Upon inspection the wheel on the bearing when installed was good and tight no slop in the bearing at all. Now there is a very large noticeable amount of wiggle slop between the wheel and the bearing race shaft part.

Some calculations and yeah probably not made to run for 30 minutes at a time spinning at a calculated close to 1700 RPM! OOPS did not consider that!

So Now looking for sources for a roller like this,

https://www.mcmaster.com/22875T4-22875T11/

1.25" dia would be best, a medium softer rubber is good, But one of this style,

https://www.mcmaster.com/track-rollers/shaft-mount-track-rollers-5/

where the shaft goes all the way through and is still ball bearing.

any other sources other than mc master?

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#33
In reply to #32

Re: Blower Vanes

02/14/2021 12:42 PM

And I am again still in need for a blower wheel.

This one would be great!

https://surpluscityliquidators.com/products/3-18-8-dia-cw-blower-wheel-12-bore.html?29417#slide_272904

BUT...... and there always seems to be a "BUT" isn't there?

I went to buy one, but they have 20 buck min order, they say buy more stuff or we can just charge you 20 for the wheel. So I went back in and found a few things I could eventually use, ,,, don't need right now, but may eventually so got the order up to 21 bucks.

Proceed to checkout, all looks good till I get to the choose shipping method.

are they freaking nuts! Indiana to Wisconsin with a box that might weigh a pound or two max, and these are the shipping costs!?

They must think they are an E-Bay seller!

Joe

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#34

Re: Blower Vanes

02/16/2021 5:49 PM

On a roller that uses this as the sleeve bearing

SAE 841 Bronze

What material shaft would be the best to mate with it to spin on?

Joe

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