Impulse sprinkler
From DDL Wiki
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Revision as of 13:41, 30 January 2014
Contents |
Stakeholder Needs
!!!! We only have retailer and customer -- we need to add manufacturer and transporter !!!
- What does the user need?
- The user needs it to be easy to set up. It has to be easy to screw in to a hose without a bunch of water leakage.
- There has to be easy to follow instructions.
- It has to be portable, so that people with larger gardens can easily move it around.
- It has to be durable since sometimes people just leave it in their yard.
- It has to be reliable because the water distribution should be uniform.
- It has to be able to water the lawn effectively while minimizing the amount of water that ends up on the sidewalk or driveway.
- It has to work well with different water pressures.
- It has to be easy to clean and maintain.
- What does the retailer need?
- Inexpensive to produce and therefore inexpensive to acquire (since it is plastic instead of metal).
- Lightweight so it is easy to ship.
- Easy to explain to customers.
- Durable, so customers will not need warranty replacements or repairs
- Compatibility with various mounts from various manufacturers
- What does the product have?
- The product is easy to set up. All the user has to do is attach the sprinkler to the stake and put the stake in the ground and attach a hose
- It can be adjusted to cover 360° or to just spray a specific region.
- It has a sturdy build, but it has some plastic parts that may be prone to damage
- It has maintenance and cleaning instructions included in the packaging.
- Comments/Observations
A stake is not always required since some places come with underground system. The maintenance instructions are easy to follow; futhemore, there is a clever color code: all the things that need to be adjusted are in green.
Step to using the product
Step 1: Removing from packaging
The sprinkler is tied into a cardboard sheet using plastic ties, which are easily cut.
Step 2: Make adjustments
The sprinkler head can be adjusted for the spray made, by using the built in deflector at the top or adjusting the diffusion of the spray. Furthermore, the plastic tabs at the bottom can be used to determine the angle of the spray, and can be restricted to a straight line or opened up to a 360° distribution.
Step 3:Stick the stake into the ground
Make sure the stake is deep enough that the water pressure won’t displace the sprinkler(picture from amazon https://images-na.ssl-images-amazon.com/images/G/01/outdoor-living/detailpages/rainbird/B005MICYTU-1L.jpg; couldn’t actually test it because of the weather)
Step 5
Attach hose to the open end on the stake, and turn on the water. The water pressure can be adjusted from the hose to affect the spray distance, as well as the knob on the top of the sprinkler
How the Product Works Mechanically
The water coming out of the nozzle goes into a S-shaped pipe from which the water goes out in the same direction it went in, but further to the left, allowing a higher torque to be generated. The reactive force to this torque is given by the acceleration of the inertia mass, such that the main frame remains almost immobile. When it then comes back toward the frame because of the spring and hits it, it gives its momentum to the main frame, which rotates a bit. But as it hits the frame, some water goes into the S-shaped pipe and the process begins again.
The two different modes (360 continuous/back and forth) are selected thanks to a lever, which can put a small plastic piece up or down each times it hits the metal parts setting the limits. When this piece of plastic is down, then the inertia mass will hit the main frame on it way back, pushing it counter-clockwise; when it is down, the inertia mass will hit the main frame before, just after being moved by the water going out of the s-shaped pipe, pushing it clockwise. That way you can go back and forth between two limits.
Videos testing a very similar model, from Rain Bird; between 04:00 and 05:30 on YouTube Snapsohts:
Part List
Expolded view
Bill of materials
Part Number | Name | Quantity | Mass (g) | Function | Material | Manufacturing Process | Image |
---|---|---|---|---|---|---|---|
1 | Distance Adjuster | 1 | 5 | Adjust distance of water thrown | Plastic | Injection | |
2 | High Adjuster Knob | 1 | 3 | Adjust the slope of part 1 | Plastic | Injection | |
3 | Axial Spring | 1 | <1 | Keeps part 1 up | Metal | Off the shelf | |
4 | Axle | 1 | <1 | Allows the arm to rotate in the main frame | Plastic | Injection | |
5 | Torsional Spring | 1 | 1 | Brings the arm back towards the main frame | metal | Off the shelf | |
6 | Arm | 1 | 13 | Inertia wheel/ Moves when hit by water and rotates the whole sprinkler when hit the frame | Plastic | Injection | |
7 | Screw | 1 | <1 | Disperse the water stream | Plastic | Injection | |
8 | Main Frame | 1 | 21 | Houses the sub-assembly Arm+Axle+Tosional Spring | Plastic | Injection | |
9 | Actuator | 1 | <1 | Triggers the direction lock | Plastic | Injection | |
10 | Interrupter | 1 | 1 | Changes the direction of rotation of the sprinkler | Plastic | Injection | |
11 | Metal bracket | 1 | <1 | Hits the clips when it should change the direction of rotation and transmit the force to the actuator | Metal | Off the shelf | |
12 | Axial Spring 2 | 1 | <1 | Push down the mount to prevent leakage | Metal | Off the shelf | |
13 | Clips | 2 | 1.5 | Determine the range of motion | Plastic | Injection | |
14 | Mount | 1 | 6 | Connect to the hose and allows the frame to rotate | Plastic | Injection | |
15 | o-ring | 1 | <1 | Prevent leakage | Rubber | Off the shelf | |
16 | o-ring 2 | 1 | <1 | Prevent leakage | Rubber | Off the shelf | |
17 | Ring | 1 | <1 | Allows the frame to rotate inside the mount by reducing friction | Teflon | Off the shelf | |
18 | o-ring 3 | 1 | <1 | Holds the frame inside the mount and prevent leakage | Rubber | Off the shelf | |
19 | torsional spring 2 | 1 | <1 | Connects part 9 and 10 as an unstable triggering system | Metal | Off the shelf |