Abstract:
A foam generator includes a body and a removable insert positioned within the body. The insert is held to the body by a cap releasably engaging a mating surface of the body. The body includes a plurality of inlets for foam constituents adjacent the mating surfaces of the body and an outlet for the foam opposite end. To change the insert, the can is disengaged from the mating surface without the need for tools and without disturbing the inlets. A new insert can be placed within the body and a cap of the new insert engaged with the mating surface without the need for tools.

Description:
BACKGROUND 
     In car washes and other automated washing systems, it is known to have foam generators to mix air and washing or cleaning chemicals to create a foam that may then be sprayed or applied to a surface to be washed. Examples of this sort of system include but are not limited to car washes and other vehicle washing systems. 
     Conventional approaches to devices that to generate the foam by aerating a cleaning chemical have required fairly complex machinery and these devices have typically required time consuming manual labor. Often, when these devices are installed in commercial or industrial settings, it is desirable to have a device that may be cleaned, maintained and/or repaired in minimal time so as to reduce the cost of downtime required when the device is out of service or not working optimally. 
     Further, existing conventional foaming devices have not been designed for frequent disassembly and maintenance. Repeated disassembly of these conventional devices may serve to degrade the devices effectiveness and ability to operate as designed. 
     Current or conventional units are made from mechanical fittings that are not intended to be put together and taken apart over and over again. This disassembly and reassembly process takes over 20 minutes to complete per unit, and requires the disconnecting of any air and chemical lines. To open the unit itself to access the inner element, a user requires various types of wrenches and pliers to perform this task. A type of thread sealant is typically required to reassemble the unit and ensure a watertight assembly. 
     Conventional foam generators incorporate a filter media that is similar to standard household pot scrubber pads. While these media are cheap and readily available, there are some drawbacks to the use of this media. In conventional foam generators, this media is pushed in the foam chamber with a stick or screwdriver and the unit is then reassembled. In use, the media begins to filter the chemical passing through the media and as it filters objects out of the chemicals, the media can clog and compress down in the direction of the flow of the chemical passing through it. This creates back pressure and reduces the performance of the foam generation and application by reduction of pressure. This also reduces the effectiveness of the filtering due to a reduction of the surface area of the media. Another problem is that results from compressing the media into the chamber it that control over the positioning of the media within the generator is lost. These degradations and loss of effectiveness do vary from one foamer to the next. The inconsistency of the generators has been accounted for by installing valves on the air and chemical lines to control pressures but this had to be set and adjusted on a regular schedule and is always erratic. 
     The air and chemical lines of conventional foam generators have always been stacked on top of each other and attached to the foam generator at a top of the generator. The chemical wash component used to generate the foam feeds into a first inlet on a tee fitting with a second inlet on the tee fitting providing an attachment point for feeding in the pressurized air needed to operate the foam generator. This approach typically requires a check valve on the chemical side to prevent the chemical wash component from feeding into the air side when the generator starts to become clogged and build back pressure. 
     Improvements to conventional approaches to making foam generators are desirable to reduce the time required to clean and repair the device. Such improvements may also be useful in reducing the time required to manufacture and assemble these devices. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawing figures, which are incorporated in and constitute a part of the description, illustrate several aspects of the present disclosure and together with the description, serve to explain the principles of the present disclosure. A brief description of the figures is as follows: 
         FIG. 1  is a perspective view of a foam generator according to the present disclosure. 
         FIG. 2  is a perspective view of the foam generator of  FIG. 1 , illustrating removal of an insert from an outer body. 
         FIG. 3  is an exploded view of the outer body. 
         FIG. 4  is an exploded view of the insert. 
         FIG. 5  is a section view of foam generator of  FIG. 1 , taken along line  5 - 5  in FIG. 
     
    
    
     Within these figures, the following reference characters are used to refer to the following corresponding elements that will be described below:
           10  is a foam generator body     12  is a foam generator insert     14  is an outer pipe     16  are couplings     18  is a bushing     20  is an outlet     22  is a resin cast surface     24  is a water inlet     26  is a chemical inlet     28  are elbow fitting holes     30  is a cap     32   is  a steel rod hole     34  is a steel rod     36  are bio balls     38  are mesh discs     40  is an acorn nut     42  are washers     44  is a cone washer     46  is a rubber seal     48  is a nut     50  is a foam generator       

     DETAILED DESCRIPTION 
     Reference will now be made in detail to exemplary aspects of the present disclosure which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. 
     The foam generator of the present disclosure uses a custom configured body that may include a tool-free or hand-unscrewable cap that does not require any disconnecting of air or chemical lines or the use of any tools or sealant. The foam generator of the present disclosure may be opened to access the interior elements and fully serviced in as little as 20 seconds. 
     The foam generator of the present disclosure also may incorporate an improved media pad that is uniform in density and size so that there is no variation from one pad to another and so that each generator chamber functions the same due to the consistent placement of the foaming media. The foaming media pad may be suspended in place by a rod that is attached to the removable cap-like cover on top of the generator. The media pads may be kept from compressing into each other on the rod by alternating between two different types of media. A second media to alternate with the media pad may be a mixing media made of a more solid or less-flexible plastic. The need for valves on the air and chemical lines may be removed because each generator may now operate at consistent pressure with respect to other foam generators and individual adjustments for specific generators are not needed. One adjustment may be made at a central pumping station or pressure source used by all the foam generators of a particular installation. 
     The foam generator according to the present disclosure may have both the air and/or water line and chemical lines ported or feed directly and independently into the top of a body portion of the foam generator which makes it easier to service. The lines do not have to be removed as part of the service process and can remain attached to the body portion while internal elements are accessed and services. Also because the improved foam generator according to the present disclosure does not build up significant back pressure through use, there is no need for check valves. 
     As an added benefit to the operation of a foam generator constructed according to the present disclosure, an improved consistency and quality of chemical application through the foaming process may result in a reduction of chemical usage necessary to gain the desired minimum application rate by up to 30% or more. 
     Referring now to the FIGS., a foam generator  50  according to the present disclosure may include a foam generator body  10  and a foam generator insert  12 . Body  10  may be made of an outer pipe  14  with upper and lower couplings  16 . A bushing  18  may be positioned within lower coupling  16  to provide for mounting of an outlet  20 . Upper coupling  16  may include a resin cast surface  22  or any other suitable surface that may provide threads or other suitable engagement surfaces for securing a cap  30  of insert  12  within body  10 . Upper coupling  16  may also include a water inlet  24  and a chemical inlet  26  attached directly to the upper coupling and not to cap  30  of insert  12 . Inlets  24  and  26  may be mounted in elbow fitting holes in the upper coupling and provide a fluid connection between sources of water and/or air and chemicals that will be forced through the generator to generate the desired foamed chemical solution for application to a surface, such as but not limited to application of soap or other suitable surfactant to a vehicle in a car wash setting. Typically, the water and/or air entering through the inlet would be pressurized to provide the necessary force to urge the foam constituents through the body to exit through the outlet as a chemical foam solution. 
     Insert  12  may comprise cap  30  with a linear rod such as but not limited to steel rod  34  extending through a rod hole  32  and preferably releasably secured to the cap by a removable fastener such as but not limited to acorn nut  40 . Positioned along rod  34  may be a plurality of alternating foam generating elements such as but not limited to bio balls  36  and mesh disks or pads  38 . As mentioned above, the alternation of foam generating elements of different degrees of rigidity and compressibility may permit the positioning and movement of the foam generating elements within generator  50  to be held consistent. This may permit generator  50  to generate a sufficiently consistent foam chemical solution with consistent pressure on the water and chemical inlets between servicing. It may also permit a plurality of generators  50  to generate consistent foam chemical solutions while being supplied from a pressure source with the same pressure for all of the generators. This may eliminate the need for pressure regulators for any of the generators and permit a common pressure source to be used for a plurality of foam generators  50 . 
     Since inlets  24  and  26  are not located on cap  30 , the configuration of insert  12  permits the easy removal of generator insert  12  without the need to dismantle any other portions of generator  50 . Cap  30  and resin surface  22  will preferably mesh and engage in such a fashion as to prevent leakage of any significant amounts of water or chemical from with body  10  while still permitting the quick and easy removal of insert  12 . With proper selection of materials and sizes, and with the inclusion of sufficient threads or engagement surfaces, it is anticipated that cap  30  may be removed from body  10  without the need for tools. 
     To ensure easy rotation of cap  30  to remove insert  12  from or engage insert  12  with body  10 , an arrangement of elements as illustrated in  FIG. 4  may permit the rotation of cap  30  without rotation of rod  34 . Washers  42  may be positioned above and below cap  30  with rod  34  extending through rod hole  32 . In addition, a cone washer  44  may be positioned on rod  34  directly beneath cap  30  to further suspend cap  30  and permit freer rotation of cap  30  with respect to rod  34 . A rubber seal may be placed about rod  34  to prevent chemicals and water from within body  10  from escaping through rod hole  32  and another washer  42  may be positioned below the rubber seal to aid in its operation. The whole assembly of elements may be clamped between accord nut  40  and a nut  48  with sufficient force to prevent leakage while permitted rotation of cap  30  without rotating rod  34 . Below the foam generating elements may be positioned a fixed washer  42  permanently attached to  34  to secure foam generating elements  36  and  38  to rod  34  which might require the disassembly of cap  30  from rod  34  to remove, change or replace the foam generating elements. Alternatively, another nut  48  may be provided at a lower end of rod  34  to releasably secure the foam generating elements to rod  34  while still permitting their removal and replacement. 
     The elements disclosed in the exemplary embodiment above are illustrative only and are not intended to limit the scope of the present disclosure. It is anticipated that any of a variety of assemblies could be used to permit rod  34  and cap  30  to rotate independently of each other, and that a plurality of different approaches may be used to secure sources of water or chemicals to body  10 . It is further anticipated that more than two inlets may be provided where it is desirable to generate a foam that includes more than two constituent elements. It is anticipated that any variety of gases, powders or liquids may be introduced into generator  50  via such inlets and it is not intended to limit the nature of the constituent elements needed to produce the desired chemical foam solution. 
     The number of foam generating elements that are part of insert  12  may be greater or fewer in number than that illustrated. The length of rod  34  relative to the overall length of generator  50  may be varied as needed to accommodate the number and/or variety of foam generating elements needed. The bio balls and the mesh elements may be configured different from those shown provided they accomplish the purpose of combining the elements introduced through the inlets into a suitable foam solution before the elements exit generator  50  through outlet  20 . The ratio of more flexible mesh elements and more rigid elements may be altered as needed to accomplish the desired mixing and foaming of the water and chemicals. The length of outer pipe  14  of body  10  may be adapted to accommodate the number of foam generating elements needed as part of insert  12 . The diameter of outer pipe  14  may also be selected as needed to provide the desired flow rate and foam generation characteristics based on the constituent elements to be mixed and foamed. It is anticipated that the foam generating elements would be selected and adapted to match the size of outer pipe  14  to ensure the creation of the desired foamed chemical mixture. 
     It is anticipated that different features may be added to rod  34  to provide separation of foam generating elements as needed, without having to have more rigid elements to provide the desired spacing. It is anticipated that the foam generating elements may be configured to be removable from rod  34  without having to disassemble cap  30  from the rod. The various foam generating elements used on rod  34  may be selected from a variety of available products and materials to ensure the desired foam chemical solution being generated by generator  50 . 
     It is anticipated that any of the various elements shown and described herein may be made from a variety of distinct sub elements or may be crafted as a single monolithic structure. As a non-limiting example, it is anticipated that outer pipe  14  and couplings  16  could be molded, manufactured or machined as a single unit. 
     While the invention has been described with reference to preferred embodiments, it is to be understood that the invention is not intended to be limited to the specific embodiments set forth above. Thus, it is recognized that those skilled in the art will appreciate that certain substitutions, alterations, modifications, and omissions may be made without departing from the spirit or intent of the invention. Accordingly, the foregoing description is meant to be exemplary only, the invention is to be taken as including all reasonable equivalents to the subject matter of the invention, and should not limit the scope of the invention set forth in the following claims.