The disclosure relates to chemical product dispensing.
Chemical products are often packaged in a concentrated form that, depending upon the application, may be diluted with water to create a use solution having a desired concentration of the chemical product. These concentrates or ultra concentrates may permit more efficient transport and storage over their less concentrated counterparts. Such concentrated chemical products may include, for example, detergents and other cleaning, disinfecting, or sanitizing products. The chemical product concentrates may also be used in food processing, medical, or industrial applications. For cleaning applications, the concentration of the chemical product in the use solution may be important to ensure effective cleaning, disinfecting, and/or sanitizing. For example, there are many applications where the concentration of the use solution is regulated to ensure effective sanitizing or disinfecting.
In general, this disclosure relates to metering and dispensing controlled quantities of a fluid product. The fluid product may include, for example, a fluid chemical product, a concentrated fluid chemical product, or an ultra-concentrated fluid chemical product.
In one example, the disclosure is directed to a dispensing system comprising a fluid drive unit including a housing having an inlet connected to receive a supply of a diluent such that flow of the diluent causes rotation of a rotor positioned within a cavity of the housing of the fluid drive unit, the housing further having an outlet from which the fluid exits the housing and is directed to a reservoir, wherein a rotational speed (revolutions per minute) of the rotor as a function of flow rate of the diluent is substantially linear over a defined range of diluent flow rates, a pump connected to receive a supply of a fluid chemical product concentrate, the pump further connected to be driven by the rotation of the fluid drive unit, resulting in dispensation of the fluid chemical product concentrate into the reservoir responsive to rotation of the fluid drive unit such that a dilution ratio of a volume of the fluid chemical product concentrate dispensed per unit time versus a volume of diluent exiting the fluid drive unit per unit time is constant over the defined range of diluent flow rates, and a return home interface having an off position and a dispense position, the return home interface comprising a lobe rotor configured to interface with the pump such that the pump is stopped at a desirable rotational index when the return home interface is in the off position.
In some examples, the diluent is a liquid or a gas. In some examples, the fluid drive unit comprises a turbine drive unit or a wheel drive unit. In some examples, the diluent is water. In some examples, the dilution ratio is in the range of 0.01 to 10 ounces per gallon.
In some examples, the rotor includes a drum having a plurality of blades disposed around a periphery of the drum, and wherein the blades have one of a flat shape, a scoop shape or a bucket shape. In some examples, a concentration of the fluid chemical product in a use solution formed in the reservoir is constant over the defined range of diluent flow rates. In some examples, the reservoir includes one of a container, a bucket, a pail, a bottle, a spray bottle, a sink, a sump, a non-rigid bag, a cleaning machine, a dish machine, or a laundry machine. In some examples, the fluid chemical product concentrate includes at least one of a detergent, a rinse agent, a bleach, a fruit and vegetable wash, a disinfectant, or a sanitizer. In some examples, the pump is a fixed volume displacement pump. In some examples, the pump is one of a rotary pump, a gear pump, a screw pump, a piston pump, or a peristaltic pump.
In some examples, the pump further includes a circular housing having a continuous interior sidewall, the circular housing further including an inlet through which the fluid chemical product is received and an outlet through which the fluid chemical product concentrate is dispensed, a pump lobe rotationally mounted within the circular housing, the lobe rotor including first and second opposed sides each forming a sealing surface with the interior sidewall, the lobe rotor further including third and fourth opposing sides each forming a cavity with the interior sidewall, and a flexible membrane having first and second ends each fixed to a different position on the interior sidewall and forming a sealing surface with the first or second opposed ends of the pump lobe as the pump lobe rotates within the housing.
In some examples, the lobe rotor of the return home interface is configured to interface with the pump such that the pump lobe is stopped at a rotational position within the housing in which the first and second ends are not in contact with the flexible membrane when the return home interface is in the off position.
In some examples, the lobe rotor of the return home interface is configured to interface with the pump such that the pump lobe freely rotates within the housing when the return home interface is in the dispense position.
The details of one or more examples are set forth in the accompanying drawings and the description below. Other features and advantages will be apparent from the description and drawings, and from the claims.
In general, this disclosure relates to a fluid-driven chemical product dispensing system for metering and dispensing of a fluid chemical product. The fluid chemical product may include a concentrated fluid chemical product or an ultra-concentrated fluid chemical product. The dispensing system is configured to be connected to a supply of the fluid chemical product. The dispensing system includes a drive unit powered by flow of a fluid, such as a diluent or a gas, and a pump which delivers the fluid chemical product concentrate from the supply to a destination for the dispensed fluid chemical product concentrate. The destination may include a receptacle, container, reservoir, bucket, pail, bottle, spray bottle, sink, sump, non-rigid bag, cleaning machine, dish machine, laundry machine, or any other intermediate or end use application. The dilution ratio of the volume of fluid chemical product concentrate dispensed per unit time versus the volume of diluent exiting the drive unit per unit time is constant over a defined range of diluent flow rates.
The fluid-driven chemical product dispensing system of the present disclosure may accurately dose chemistries that are challenging to accurately dispense due to inherent properties such as high viscosity liquid concentrate chemistries. Furthermore, the dispensing system does not require the use of electric power to provide accurate dispensing of such fluid chemical product concentrates. The system may also be used to dispense liquids in low temperature environments temperature (i.e., below 68° F.) in which the product viscosity increases to the extent that conventional aspirator-type dispensers are no-longer reliable dispensing methods.
The fluid-driven chemical product dispensing system may further optimize pump performance by providing a mechanism that prevents the pump rotor from stopping in an orientation that may result in prolonged deflection of components within the pump mechanism that can lead to poor pump performance.
In addition, the fluid-driven chemical product dispensing system enables consistent dispensing volumes of liquid chemistries, making it easier to ensure accurate dosing of product in a variety of environments over a wide temperature ranges, such as those experienced in cold food preparation or processing environments to hot/humid dishwashing or laundry areas. Another advantage is the ability to leverage the pressure of the in-house water supply to “power” the pump and yet achieve consistent dispensing.
In both
Fluid chemical product concentrate 60 may include at least one of a detergent, a rinse agent, a bleach, a fruit and vegetable wash, a disinfectant, or a sanitizer. In addition to cleaning applications, the fluid chemical product concentrate may be one that is used for any other intermediate or end use application, including healthcare, food and/or beverage processing, or industrial applications. The fluid chemical product concentrate 60 may be contained in a product package from which it is to be dispensed or it may be poured into some other container or receptacle from which it is then dispensed. The product packages 62A and/or 62B may be any size or shape and may include a rigid container, a drum, a tank, a pouch, a bottle, a bag, a bag-in-box, a bag-in-bottle, or any other type of product package suitable for containing and dispensing fluid products.
In
Drive unit 20 includes an inlet 22 and an outlet 24. Drive unit 20 is powered by flow of a fluid through a fluid flow path defined by inlet 22, through the drive unit 20, and outlet 24. In some examples, the drive fluid may include a diluent, such as water or an aqueous solution. If flowing water is not available, drive unit 20 may be air powered. In the example of
Drive unit 20 includes a wheel drive unit that converts the energy from flow of the diluent or other drive fluid into a rotational form of power. In one example, fluid drive unit 20 includes a turbine drive unit. However, it shall be understood that fluid drive unit 20 may include other types of drive units, and that the disclosure is not limited in this respect. A water wheel, turbine, or other drive unit typically includes a rotor including a shaft or drum having a plurality of vanes or blades arranged around the periphery of the drum. The blades provide a driving surface for the flow of diluent. The blades may be flat, scooped, concave, bucket-shaped, or any other appropriate shape. The blades may further be perpendicular to the surface of the drum or may be angled with respect to the surface of the drum. In the case of a turbine drive unit, drive unit 20 includes a housing or casing surrounding the rotor which contains and directs the fluid diluent. The turbine may include an impulse turbine (such as a Pelton, a Turgo, a cross flow, or a water wheel), a tesla or bladeless turbine, a reaction turbine (such as a Francis, a propeller type or a screw type), or any other appropriate turbine type.
The energy provided by the flowing diluent turns the blades of drive unit 20 which is connected to transfer the rotational energy of the turning rotor to a first or input drive shaft 32. Drive unit 20 may be geared or include some other mechanism to adjust the dilution ratio of the chemical product concentrate dispensed; that is, the ratio of the volume of fluid chemical product concentrate dispensed per unit time to the volume of diluent exiting the drive unit per unit time. For example, a configurable gearbox 30 may be used to adjust (increase or decrease) the rotational speed (revolutions per minute or rpm) of an output drive shaft 34 from the relatively lower or higher rotational speed of input drive shaft 32. This effectively changes the rotational speed at which pump 40 is driven, thus changing the volume of fluid chemical product concentrate dispensed per unit time. Example dilution ratios may range from 0.01-10 ounces/gallon depending upon several factors including the concentration of chemical product concentrate, the viscosity of the chemical product concentrate, the desired concentration of the resulting use solution, etc.
Gearbox 30 may be implemented in a variety of ways such as one or more meshing gears, a chain drive, a belt and pulley drive, a continuously variable transmission, or other mechanism for adjusting (either increasing or decreasing) the rotational speed and torque from input drive shaft 32 to output drive shaft 34. An example pulley train may include one or more drive pulleys fixed at some location in the proximity of other driven pulleys and idle pulleys that allow for multiple “gearing ratio” [s] to be achieved with use of shafts and pulleys of varying diameter. An example continuously variable transmission may include two pulleys connected by a belt where one pulley is turned by the turbine and other is connected to the pump. Changing the size of the pulleys between small and large within the CVT changes the effective dilution.
One or both of the input drive shaft 32 and/or the output drive shaft 24 may be flexible to permit the pump and the supply of chemistry to be located remote from the drive unit.
In some examples, the dilution ratio (and thus the gear ratio provided by gearbox 30) may be selectable by a user to achieve the desired concentration of the fluid chemical product in the resulting use solution. In such a case, systems 10A and/or 10B may include one or more mechanical knobs or switches by which the user may select the desired dilution ratio. In other examples, selection of the gear ratio may be electronically controlled by input into a graphical user interface. In some examples, such dilution ration adjustments are accessible only to the authorized personnel, such as an installer, manager, or customer service representative, to prevent unauthorized tampering with the amount of product dispensed. This may reduce the likelihood for formation of use solutions having incorrect concentrations of the chemical product. In other examples, the gear ratio may be fixed to provide a known gear reduction between input drive shaft 32 and output drive shaft 34 and thus to provide a fixed dilution ratio.
Output drive shaft 34 transmits the rotational motion to pump 40. Pump 40 is thus ultimately driven by flow of the diluent through the drive unit 20. In the example of
In the examples of
In the examples of
In use, when dispensation of the fluid chemical product concentrate 60 is desired, an operator may manually actuate dispenser interface 50 from a closed position to a dispense position by opening valve 26, thus starting the flow of diluent to inlet 22 of drive unit 20. Flow of fluid through drive unit 20 rotates first drive shaft 32, the rotation is reduced by the appropriate gear ratio by gearbox 30, and the resulting rotation of second drive shaft 34 is transferred to pump 40. Rotation of the pump mechanism 40 draws fluid chemical product concentrate 60 into the pump via pump inlet 41 as indicated by arrow 42 in
In some examples, as discussed above, the volumetric flow rate of fluid chemical product concentrate dispensed by pump 40 is proportional to the volumetric flow rate of the diluent through drive unit 20 over a defined range of diluent flow rates. The dilution ratio (the ratio of the volumetric flow rate of the chemical product concentrate dispensed by the pump and the volumetric flow rate of the diluent dispensed) is thus substantially constant over the defined range of diluent flow rates. In this way, the dispensing systems 10A and/or 10B may maintain a dilution ratio that is substantially constant over a defined range of diluent flow rates. Dispensing systems 10A and/or 10B may therefore accurately dispense relatively small amounts of a fluid chemical product concentrate while maintaining a concentration of the end use solution within a desired range.
Pump 40 may be implemented using many different types of pumps. Considerations regarding the type of pump include, for example, the type of drive mechanism with which the pump is to be driven; the type of fluid chemical product concentrate to be dispensed; the concentration of the fluid chemical product to be dispensed; the pressure, viscosity and/or flow rate of the incoming drive fluid; the desired dispense flow rate (volume/time) of the chemical product to be dispensed; the desired relationship between the diluent flow rate and the dispensed chemical product flow rate; the type of product container; and/or any other factor that may affect the type of pump to be used.
In one example, the dilution ratio of the amount (volume) of fluid chemical product concentrate dispensed from pump 40 per unit time versus the amount (volume) of drive fluid dispensed from drive unit 20 per unit time is constant over a defined range of diluent flow rates. That is, the flow rate of the fluid chemical product concentrate dispensed versus the flow rate of the diluent exiting the fluid drive unit is constant. In this way, the amount of chemical product concentrate dispensed into the use solution reservoir 82 (as indicated by arrow 44) and the amount of drive fluid dispensed into use solution reservoir 82 (as indicated by arrow 24) will result in a use solution having a known, constant concentration over a flow rate range of interest, regardless of the pressure, or volume of fluid driving the drive unit 20.
For various cleaning, sanitizing or disinfecting applications, the dilution ratio for an example fluid chemical product concentrate may be in the range of 0.01-10 ounces/gallon and the flow rate of the diluent may be in the range of 1-4 gallons/minute.
In one example, pump 40 may be implemented using a fixed displacement rotary pump, in which the flow through the pump per rotation of the pump is fixed. That is, the volume of fluid output per rotation of the pump is a known constant volume. In another example, pump 40 may be a peristaltic pump, a rotary pump, or any pump that uses translation of rotary motion to move a fluid. In such an example, pump 40 includes a rotor with a number of “rollers” that compress a flexible tube containing the chemical product concentrate to be dispensed. As with the example of
In some examples, pump 40 may be implemented using a reciprocating or rotary positive displacement pump, such as a gear pump, a screw pump, a piston pump, a peristaltic pump, etc. As another example, pump 40 may be implemented using a velocity pump, such as a centrifugal pump, a radial flow pump, an axial flow pump, etc. Pump 40 may also be implemented using a gravity pump, or any other type of pump known to those of skill in the art. The displacement may be fixed or variable. In some applications, the pump may be a single-use pump or a disposable pump. It shall therefore be understood that any type of pump capable of delivering fluids may be used, and that the disclosure is not limited in this respect.
Push knob 202 of return home interface 200 is the point of interface for a user and is the mechanism by which a user may initiate and/or stop a dispense cycle. In this example, to start a dispensing cycle, the user manually pushes in push knob 202 and rotates it to the right. The rotation to the right locks the dispenser (such as dispensing system 10) into dispensing mode until the user rotates it back to the left. Crank link 204 transfers the rotational motion from push knob to slider 206, which is fixedly mounted to pushing link 208. Slider 206 transfers motion from crank link 204 to pushing link 208, which in turn transfers motion from slider 206 to lobe rotor 210. Lobe rotor 210 is connected to the pump (such as pump 40 of
At the beginning of a dispense cycle, the push knob is in the normal or dwell state (dispenser off or closed) position shown in
For example, in
To help ensure that lobe rotor 210 rotates pump lobe 242 to an acceptable rotational position (or index) within the pump housing 250, lobe rotor 210 may be keyed to interface with pump 240 in a known orientation such that when pump 240 is connected to return home interface 200, pump lobe 242 is in the desired closed rotational position with respect to lobe rotor 210 when return home mechanism is in the closed or off position (as shown in
In some examples, return home mechanism is at least a part of dispenser interface 50 of
In some examples, dispenser interface 50 of
When an appropriate amount of chemical product has been dispensed, controller 50 may automatically close valve 26, stopping the flow of diluent through the drive unit 20 and stopping dispensation of chemical product through pump 40A. In addition, controller 50 may electronically control a return to home mechanism (such as return to home mechanism 200) to return pump rotor 242 to a home position, such as shown in
A dispensing system comprising a fluid drive unit including a housing having an inlet connected to receive a supply of a diluent such that flow of the diluent causes rotation of a rotor positioned within a cavity of the housing of the fluid drive unit, the housing further having an outlet from which the fluid exits the housing and is directed to a reservoir, wherein a rotational speed (revolutions per minute) of the rotor as a function of flow rate of the diluent is substantially linear over a defined range of diluent flow rates, a pump connected to receive a supply of a fluid chemical product concentrate, the pump further connected to be driven by the rotation of the fluid drive unit, resulting in dispensation of the fluid chemical product concentrate into the reservoir responsive to rotation of the fluid drive unit such that a dilution ratio of a volume of the fluid chemical product concentrate dispensed per unit time versus a volume of diluent exiting the fluid drive unit per unit time is constant over the defined range of diluent flow rates, and a return home interface having an off position and a dispense position, the return home interface comprising a lobe rotor configured to interface with the pump such that the pump is stopped at a desirable rotational index when the return home interface is in the off position.
The dispensing system of Example 1 wherein the diluent is a liquid or a gas.
The dispensing system of Example 1 wherein the fluid drive unit comprises a turbine drive unit or a wheel drive unit.
The dispensing system of Example 1 wherein the diluent is water.
The dispensing system of Example 1 wherein the dilution ratio is in the range of 0.01 to 10 ounces per gallon.]
The dispensing system of Example 1 wherein the rotor includes a drum having a plurality of blades disposed around a periphery of the drum, and wherein the blades have one of a flat shape, a scoop shape or a bucket shape.
The dispensing system of Example 1 wherein a concentration of the fluid chemical product in a use solution formed in the reservoir is constant over the defined range of diluent flow rates.
The dispensing system of Example 1 wherein the reservoir includes one of a container, a bucket, a pail, a bottle, a spray bottle, a sink, a sump, a non-rigid bag, a cleaning machine, a dish machine, or a laundry machine.
The dispensing system of Example 1 wherein the fluid chemical product concentrate includes at least one of a detergent, a rinse agent, a bleach, a fruit and vegetable wash, a disinfectant, or a sanitizer.
The dispensing system of Example 1 wherein the pump is a fixed volume displacement pump.
The dispensing system of Example 1 wherein the pump is one of a rotary pump, a gear pump, a screw pump, a piston pump, or a peristaltic pump.
The dispensing system of Example 1 wherein the pump further includes a circular housing having a continuous interior sidewall, the circular housing further including an inlet through which the fluid chemical product is received and an outlet through which the fluid chemical product concentrate is dispensed, a pump lobe rotationally mounted within the circular housing, the lobe rotor including first and second opposed sides each forming a sealing surface with the interior sidewall, the lobe rotor further including third and fourth opposing sides each forming a cavity with the interior sidewall, and a flexible membrane having first and second ends each fixed to a different position on the interior sidewall and forming a sealing surface with the first or second opposed ends of the pump lobe as the pump lobe rotates within the housing.
The dispensing system of Example 12 wherein the lobe rotor of the return home interface is configured to interface with the pump such that the pump lobe is stopped at a rotational position within the housing in which the first and second ends are not in contact with the flexible membrane when the return home interface is in the off position.
The dispensing system of Example 12 wherein the lobe rotor of the return home interface is configured to interface with the pump such that the pump lobe freely rotates within the housing when the return home interface is in the dispense position.
Various examples have been described. These and other examples are within the scope of the following claims.
This application claims the benefit of U.S. Provisional Application No. 62/692,106 filed Jun. 29, 2018, which is incorporated herein by reference in its entirety.
Number | Date | Country | |
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62692106 | Jun 2018 | US |