Patent Application
20150337554
This device allows the safe changing of swimming pool water. It is needed because the process that causes the most catastrophic damage to a swimming pool, is changing or draining the pool water. The following is a math equation on the weight of water removed from a typical residential pool. Lets say the pool is 20 ft×40 ft width an average depth of 5 ft. Water weighs 62.3668 pounds per cubic foot. Multiplying length, times width, times depth, times the weight of water, this gives us the total weight of the water in the pool. (20×40×5×62.32668=249,467 pounds of water then divided by 2,000 gives us tons of water=124.7 tons) So a pool with these dimensions has over 124 tons of weight in it. When that much weight is removed, sometimes things move.
This device solves a costly problem in the swimming pool industry. It is a long sought solution addressing the ability to change the water in a swimming pool. I have been in the swimming pool industry for thirty years. I have three U.S. Pat. Nos. 4,815,152, 4,811,433, 4,686,717, all in swimming pool covers. I have a Los Angeles county health license #T4897 for the treatment of swimming pool water. Because of this exposure to swimming pools, I have noticed an extraordinary need for the renewal of water in pools. Once the total dissolved solids reach high levels, almost no amount of sanitizing will work to sanitize the pool water! There's even an industry built around repairing pools without draining them. A repair company will enter a pool, to do a repair, with complete diving equipment, large hydraulic rock chainsaws, and huge filters to keep the water clear enough to see during the repair. They have hydraulic rock saws that are used under water to cut into the body of the pool to do repairs. All this is to prevent the draining of the pool water.
There's also a company in San Diego Calif. that will come to your pool with a huge trailer mounted reverse osmosis filtering system. This systems whole purpose is to make the water in the pool like new, again to avoid draining the pool.
When you do drain a pool, the most common failure is plaster popping off the walls of the pool. This is caused by water trapped in the side walls of the pool pressing out when the water in the pool is removed. The most serious problem in pools is, pools popping out of the ground. This occurs when water is trapped underneath the pool. It lifts with the same force that giant aircraft carriers are lifted with. A computer search on Google for the words (popped pools) produces dozens of pictures of pools lifted out of the ground. Lifting a pool even one inch will probably destroy that swimming pool. It will partially or completely shear off all the plumbing attachments to the pool. Also, soil falls down underneath the pool preventing it from returning to its original position, if the water is removed to stop the lifting. This lifting essentially causes a complete destruction of the swimming pool.
Also, the insurance needed to cover draining of a pool is getting nearly impossible to acquire. One of the largest insurance companies of one of the largest pool service associations of southern California is now nearly refusing to cover draining of a pool, if no physical repair on the body of the pool is needed. They will not cover draining of a pool if the only purpose is to get new water in the pool.
The normal way water changes are currently done is by draining the pool down ⅓ then refilling. This draining and refilling is repeated two more times. This leaves approximately 29% of the water unchanged. Even then, pumping out ⅓ of a 20×40×5 foot pool removes 83,155 pounds of water.
A large Sport Utility Vehicle weighs around 7,000 pounds; draining ⅓ of the water from our 20×40 pool is like removing 11 SUVS in weight from the pool.
When these components are used correctly, the water in a pool can be changed with the following benefits.
The components of this device are the following:
This system works by filling giant bags, that are put in the pool, with new fresh water. At the same time, the water outside the bags is pumped out through a pump placed in the Open Top Box. If the components are sized correctly the water being ejected will be at exactly the same rate the as the incoming water. Again, if the components are sized correctly, the bags can be filled at full blast, half throttle or a trickle and the system will be automatically self-regulating.
To achieve this self-regulating water exchange, a container I call the Open Top Box is created and placed within and at the side of the swimming pool. The Open Top Box is waterproof to the extent necessary. Within the Open Top Box is placed a pump and a float valve. The size and shape of the Open Top Box is controlled by how big a pump and float valve is to be mounted within. The Open Top Box is placed or mounted at the waterline of the pool approximately ¾ submerged. From the waste pump, inside the Open Top Box, is run a waste hose to waste. Connected to the outside of the Open Top Box is a large diameter pipe or tube. This tube runs from the Open Top Box to the deepest part of the swimming pool. Due to water seeking its own level, the water in the Open Top Box is the same level as outside of the Open Top Box. It acts as one body of water.
Now a bag or bags are placed inside the pool of such size and number that when full of fresh water all of the pool water is displaced. Next, hoses are run from each bag to an incoming fresh water manifold. This manifold has valves with which to control the amount of fresh water going to each bag. This manifold gets its supply of fresh water from the float valve mounted in the Open Top Box. The float valve gets its water from an electrical solenoid valve that is normally closed. This solenoid valve is held open when supplied with electricity. The solenoid valve gets its water from the fresh water supply. In operation it functions like this. Fresh water comes to the platform holding the Open Top Box. At the platform is a solenoid valve. It is held open, electrically, by a tip switch on the platform. This tip switch controls the pump in the Open Top Box and the solenoid valve. The tip switch is a safety that will shut off both incoming and outgoing water if the mounting platform moves. This means if the platform is lifted by a water bag the system shuts down, or if the electrical power is shut off the system shuts down.
Next the water goes to the float valve in the Open Top Box. This float valve is a safety to prevent overfilling the pool. For example, if the pump stopped pumping, the water would continue to fill the pool until the float valve in the Open Top Box slowed and then shut off the incoming water.
When the float valve is open the incoming water goes out of the float valve to the fresh water hose manifold. At the manifold the valves are set proportional to the size of the bag it is filling. The fresh water flows from the manifold in the garden hoses to each bag.
Next, the bags start to fill. They fill at the same rate as a normal hose would fill a pool. As the bags fill they displace water in the pool and the water level of the pool starts to rise. Because the Open Top Box is in the pool and a large tube is running to the deepest part of the pool, the water level inside the Open Top Box will also start to rise. As it rises the top of the water reach the mouth of the pump and start to be ejected.
The pump is now ejecting the heaviest water first. Meaning, if the water in the pool is salt water, the incoming fresh water will float on top of the old heavy salt water. This floating water is kept in bags separated from the old water. The bags will continue to fill and the waste pump will continue to eject waste water until all of the water is exchanged.
Three controlling factors here are:
If the components are sized correctly the system is self-regulating. If the incoming water is slowed, the water in the Open Top Box being ejected will also slow. If incoming water is increased the out-going water will soon increase.
First embodiment, as shown in
The waste pump (#34) must be sized to handle the gallons per minute of the incoming new water. The waste pumps (#34) waste hose (#18) must be sized to keep up with the incoming fresh water. This hose (#18) must be able to handle the gallons per minute that the waste pump (#34) puts out. The bags (#64) need to be of sufficient size that the pool (#16) can be filled with the bags (#64) chosen. The water tightness of these giant bags (#64) is not of high importance. They need to fill to the point that they have some stress then leak. These bags (#64) are normally made out of woven polyethylene and will float. Both the bags (#64) and the new water have lower specific gravity then the old water (#14).
The supply hoses for the bags are regular garden hoses (#66). The incoming fresh water supply hose manifold is an off the shelf garden hose splitter. A small cone and BB type of gallons per minute meter is used to do the job of setting the manifold valves.
As shown in
In this configuration, the main pool pump (not shown) is used as the waste pump (#34). This requires that the water pump used to circulate the water in the pool be able to tolerate being in a constant state of prime. In this version an extension tube (#68) is inserted into the main drain line (#52) in the skimmer box (#24). The length of this tube determines the water column pressure (#32) and the water level (#10) of the pool. This tube (#68) will keep the water level (#10) in the pool similar to its normal level. A bag or bags (#64) are filled in the body of the pool (#16) and the pool pump (not shown) is set to run full time. Somewhere in the pool equipment, must be a splitter plumbed to waste. The weir valve tunnel must be plugged (#50) and if possible a float valve (#36) installed in the skimmer (#24) to control incoming water. This system will work without this float valve (#36) acting as a safety.
In embodiment #2 the water flow up the main drain line (#52) is created by the same differential pressure (#32) that the Open Top Box (#18) creates. In embodiment #2 the pumping effect is controlled by lowering the mouth (#38) of the waste pump (#34) inside the skimmer body (#24). This will increase flow up to a point. That point is reached when the pump (#34) reaches the bottom of the skimmer box (#24). In embodiment #2 the main drain pipe (#52) that is used to supply the waste pump (#34) is a fixed size. This means, that do to this size restriction, the incoming water may over supply the water bags (#64). The only solution is to restrict incoming water. This restriction can be created by putting a protected float valve (#36) (not shown) in the main body of the pool (#16) that limits the incoming water. The other way is to restrict the incoming water with a manual valve.
The same situation occurs in embodiment #3. The differential pressure (#32) is created by pumping water out of the skimmer box (#24). This is what the extension tube (#68) inserted into the end of the main drain line (#52) in the skimmer box (#24) controls. By making the extension (#68) shorter the water column pressure (#32) is increased, up to the point that the extension (#68) is reduced to nothing. At that point, as in embodiment #2, the incoming water must be slowed, again by a float valve (#36) in the main body of the pool (#16) or a manual valve.
The physical effect that is used is the pressure differential that is created by the Open Top Box and the position of the pump mounted within it. This pressure differential is what creates enough water flow to allow the pump to directly match the water supplied to the pool.
The ability of the system to self-regulate comes from the positioning of the pump in relation to the water level in the pool. When the pump mouth is located below the water level of the pool, pumping can occur and will occur until the level of the water in the pool falls below the level at which it can be pumped. The opposite can also occur, if the water level of the pool is below the mouth of the pump, pumping will not occur until the water level of the pool rises and brings the water level in the Open Top Box back up to the mouth of the pump.
The number one safety on the system is the float valve in the Open Top Box. And the number two safety is the tip switch. If the pump fails to pump, the water will continue to rise until the float valve activates and cuts off the incoming flow. The safety of the tip switch has to do with the heaving effect of the water bag. The water bag will lift the Open Top Box causing both the pump and the float valve to rise. This causes the system not to self-regulate. The tip switch prevents this scenario.
This means that if the Open Top Box, pump inside the Open Top Box and the float valve inside Open Top Box are set correctly, the system is self-regulating. This device uses the physical effect of water seeking its own level to create a self-regulating device. The incoming water can be turned up to full blast or down to a trickle and the system will self-regulate to that amount.
This application claims the benefit of provisional patent application No. 61/855,779 filing date May 23, 2013.
