Patent Application
20170267512
Field of the Invention
The present invention relates to equipment for filling mobile tanks, and in particular, to an automatic truck tank fill system.
Description of Related Art
Many industrial vehicles that use water often have water storage tanks attached to them. Such industrial vehicles include water trucks for street cleaning, fire trucks, and cement concrete trucks. Typically, these trucks are filled manually by an operator, usually the driver of the truck. The operator must remain at the truck while the truck is being filled with water in order to stop the water flow whenever the operator sees that the tank is full. Oftentimes, that individual will become distracted and allow the tank to overflow. The water used to fill these tanks is usually classified as processed water and, thus, any runoff is not cost effective. Also, processed water running off into the ground is usually considered an environmental risk. Reducing the amount of processed water runoff will, in turn, reduce treatment costs associated with clean-up of the runoff water, thereby lowering water contaminant volumes and, thus, the possibility of EPA-generated questions concerning water runoff.
Typically, automatic truck tank fill systems are not used because the truck is movable. Also, filling a truck tank may take a considerable amount of time. If an operator does not monitor the filling of the truck tank, it is very common in the industry that movable trucks will take off with the hose attachments still in place, thereby damaging the water refill system and/or truck. This usually occurs when the operator of the fill system is not the driver of the truck.
Another problem with the automatic fill type system occurs when the tank is full. Generally speaking, if the tank is full and the fill system keeps pumping water, the tank pressure could become dangerously high and cause the tank to fail. Therefore, it is an object of the invention to provide a safety mechanism to the system to prevent such a dangerous situation.
U.S. Pat. No. 6,681,815 is directed to an automatic truck tank fill system that includes an arrangement to automatically shut off the flow of material to a truck tank. The entire contents of U.S. Pat. No. 6,681,815 are incorporated herein by reference.
In one embodiment, an automatic truck tank fill system includes a conduit adapted to be in fluid communication with a fluid supply source. An electrically controlled valve is in fluid communication with the conduit, the valve having a first open position and a second closed position. A fill spout is in fluid communication with the conduit. The fill spout including an outer chamber. A controller is in electrical communication with the valve. A first signal opens the valve from a closed position, permitting fluid flow through the conduit, and a second signal causes the valve to close, preventing fluid to flow through the conduit. A tubing is in fluid communication with the fill spout. A pressure transducer is in fluid communication with the tubing. The controller is in electrical communication with the pressure transducer. When a pressure in the tube reaches or exceeds an activation pressure (P1), the controller sends a signal to close the valve in the conduit. A tubing breakaway connector may be provided for placing the controller and the fill spout releasably in fluid communication. The conduit may include a pipe having a first end and a second end and a flexible hose having a first hose end and a second hose end, wherein the second end of the pipe is coupled to the first hose end of the hose. The second end of the pipe may be releasably coupled to the first hose end of the hose using a hose breakaway connector. The tubing may be a 0.25 inch diameter ultraviolet resistant poly tubing.
In another embodiment, a method for filling a truck tank using an automatic truck tank fill system includes the steps of: a) placing a truck tank adjacent a filling system; b) providing a fill spout in fluid communication with a conduit, the conduit in fluid communication with a fluid supply source; c) inserting a portion of the fill spout including the outer chamber into an opening in the truck tank; d) filling the truck tank with fluid material flowing from the fluid supply source; and e) stopping the material flow via a controller when an air pressure in the truck tank has reached or exceeded an activation pressure (P1).
In another embodiment, an automatic truck tank fill system includes a pipe in fluid communication with a fluid supply source. A flexible hose is detachably in fluid communication with the pipe. A valve is defined in the pipe. A fill spout is in fluid communication with the hose, the fill spout including an outer chamber. A controller has a start control and a stop control. The controller is in fluid communication with the fill spout by a tubing. The controller is in electrical communication with the valve. The controller causes the valve to open when the start control is activated. The controller causes the valve to close when an air pressure in the truck tank reaches or exceeds an activation pressure (P1) or the stop control is activated.
Shown in phantom in
The sensor 32 is in the first state when the sensor 32 is not in contact with the fluid material in the truck tank 30. No signal is transmitted to the controller 42 when the sensor 32 is in the first state. When the sensor 32 is activated from the first state to the second state by the material in the truck tank 30 contacting the sensor 32, shown in
The control scheme 60 also has a fail safe mode. If there is an electrical power interruption where the power supply 48 ceases to supply power to the controller 42, the controller 42 will cause the valve 40 to close and/or the pump 54 to shut off. The valve 40 is normally in the closed position when there is no electrical power. When power is subsequently restored to the controller 42, the valve 40 remains closed and/or the pump 54 remains shut off. This fail safe arrangement requires the user to activate the start control 44 to continue the filling process.
In operation, the driver of the truck tank places the truck tank 30 adjacent to the automatic truck tank fill system 10. The fill spout 28 and the attached level sensor 32 in a first state is inserted into the opening 24 of the truck tank 30 by the operator. The operator then activates the start control 44 thereby opening the valve 40 and/or starting the pump 54. Fluid material from the fluid supply source 38, 38′, starts to flow to the truck tank 30. The operator does not need to watch the filling of the truck tank 30. When the material in the truck tank 30 contacts the level sensor 32, thus indicating that the truck tank 30 is full, the sensor 32 will activate to a second state, thereby causing the controller 42 to close the valve 40 and/or shut off the pump 54. The alarm 50 will activate when the valve 40 closes, thus alerting the operator that the truck tank 30 is full. The operator then removes the fill spout 28 from the opening 24 in the truck tank 30. Next, the operator then shuts off the alarm 50 by activating the stop control 46. If the operator is inattentive to the alarm 50, or if the automatic truck tank system 10 does not have the alarm 50, it is possible that the operator could move his truck with the fill spout 28 still inside the opening 24 of the truck tank 30. If this occurs, the hose breakaway connector 26 will cause hose 18 to disconnect from the pipe 12 and the electronic breakaway connector 36 will cause the sensor wire 34 to disconnect from the controller 42, thereby reducing the damage to the fill system 10.
A fill spout 28 is adapted to fit inside an opening 24 of a truck tank 30 or other type of tank or mobile tank. The fill spout 28 includes an outer chamber 102. The fill spout 28, and, in particular, the outer chamber 102 of the fill spout 28, is in fluid communication with the controller 42 via a tubing 35. In one embodiment, the tubing 35 is a 0.25 inch diameter ultraviolet resistant poly tubing, but the tubing can be made of any other suitable material. The tubing 35 can include a tubing breakaway connector 37 positioned therebetween for making the fill spout 28 and the controller 42 releasably in fluid communication with each other to prevent damage to the fill system 100. A pressure transducer 103 is also in fluid communication with the tubing 35. The pressure transducer 103 is in electrical communication with the controller 42. The pressure transducer 103 is configured to read the pressure of the air in the tubing 35 and relay that pressure reading to the controller 42.
With continued reference to
The controller 42 includes a start control 44, which starts the #ill cycle, and a stop control 46 which stops the fill cycle at any time. The stop control 46 also serves as an emergency shut off. The controller 42, having the start control 44 and the stop control 46, is in electrical communication with the valve 40, such as a solenoid valve, adjacent to the second end 16 of the pipe 12. The valve 40 has a first open position and a second closed position. The controller 42, which is powered by a power supply 48, sends a first signal that opens the valve 40 from a closed position, permitting fluid flow through the conduit 11. A second signal causes the valve 40 to close, preventing fluid flow to the conduit 11.
As the fluid level in the truck tank 30 rises, air from the truck tank 30 flows through the tubing 35, and the air pressure in the tubing 35 has an air pressure substantially identical to the air pressure in the truck tank 30. The pressure transducer 103 reads the air pressure of the air in the tubing 35 and relays that pressure reading to the controller 42. The controller 42 is set to shut off the fluid supply after a pressure reading at or exceeding the activation pressure (P1). The activation pressure (P1) can be changed by a user so that the truck tank 30 is filled to a desired level. In one embodiment, the predetermined pressure is set to a level that allows the truck tank 30 to be filled to a maximum level without spillage. The predetermined pressure may also be set so that the fluid level fills the truck tank 30 to a lower level.
The truck tank 30 is filled according to the present invention by inserting the fill spout 28, including the outer chamber 102, into the truck tank 30. The start control 44 is activated to open the valve 40, such as electrically energizing a solenoid valve, which starts the delivery of the fluid supply to the fill spout 28, and, ultimately, the truck tank 30. While filling, the air from the truck tank 30 flows through the tubing 35 to the pressure transducer 103. The pressure transducer 103 reads the pressure of the air in the tubing 35 and sends that reading to the controller 42. When the air pressure has reached or exceeded an activation pressure (P1), the controller 42 automatically closes the valve 40, such as by de-energizing a solenoid valve. This stops the fluid supply flow to the truck tank 30. At any time during filling, the stop control 46 can be activated to stop the fluid supply to the truck tank 30.
While specific embodiments of the invention have been described in detail, it will be appreciated by those skilled in the art that various modifications and alternatives to those details could be developed in light of the overall teachings of the disclosure. The presently preferred embodiments described herein are meant to be illustrative only and not limited as to the scope of the invention which is to be given the full breath of the appended claims and any and all equivalence thereof.
