Patent Application
20140222283
Radiator fins in radiators of work vehicles, such as earth moving equipment, trucks, tractors, fork lifts, and etc., that operate in dusty or wet conditions or other environments having airborne debris tend to become clogged with debris. When radiator fins become clogged, the heat exchange efficiency of the radiator is reduced which may result in engine overheating and its attendant problems, such as potential damage to the engine; a reduced work capacity for the vehicle, for example, from de-rating the engine's performance as a result of overheating, including shutting the vehicle down; or a combination of the foregoing.
Radiators with clogged fins in a vehicle may be difficult to clean because of limited access to such radiators. Common cleaning methods include brushing clogged radiators to remove debris from between the fins, washing with pressurized fluids to force debris out from between the fins, and inserting a cleaning instrument between the fins to dislodge debris. Such commonly used methods are likely to result in radiator damage, such as bent or broken radiator fins, as a result of cleaning, which also decreases the heat exchange efficiency for a radiator and may result in in engine overheating and its attendant problems.
One device, described in U.S. Pat. No. 7,418,997, uses moveable members, preferably two attached at different corners of a radiator and each driven by a motor, to direct compressed air through a radiator core to dislodge debris.
Another device, described in GB 2,462,109, discloses an apparatus that uses liquid and air fluids to clean a refrigeration condenser.
The present inventors have recognized a need for a relatively simple device for cleaning debris from a fluid passage, such as between radiator fins, and diagnosing when such cleaning efforts may not be effective, may damage the fluid passage, or may damage the cleaning device. The present inventors have also recognized a need for a radiator cleaning device that can be used with used vehicles, for example, work vehicles and trains, and on stationary devices. In particular, the present inventors have recognized that used vehicles tend to have radiators that may not be in-square, that is, the corners of such radiators may not be at substantially right angles. Not having substantially right angles may hinder attaching an in-square apparatus to a radiator, for instance, because the angles of the radiator corners are not known, and may be different from one used radiator to another. The present invention is directed toward apparatuses for one or more of cleaning, warming, or cooling a vehicle component, or other device that has a fluid passage, diagnosing when cleaning by the apparatus is not effective, diagnosing when operation of the apparatus may damage one or both of the apparatus and the item being cleaned, methods of operating such apparatuses, and methods of installing such apparatuses on vehicle components, such as radiators of newly manufactured vehicles or radiators of used vehicles, vehicle air filters, oil filters or other suitable components. Embodiments of the present invention may meet one or more of the above-identified needs.
Radiator cleaning apparatus 10 comprises a bottom bracket 20 rigidly affixed proximate to a radiator bottom end 25, in other words, the end of radiator 15 that is located closest to the ground when in a vehicle. An upper bracket 30 is rigidly affixed proximate to a radiator top end 35 that is opposite the radiator bottom end 25. A guide assembly is connected between the bottom bracket 20 and the upper bracket 30. An exemplary guide assembly includes two rods 40 with one end of each rod 40 affixed to the bottom bracket 20 and the other end of each rod 40 affixed to the upper bracket 30. In one embodiment, rods 40 are made from a high stiffness, low friction, and dimensionally stable material such as polyoxymethylene.
A cleaning assembly 45 engages the guide assembly for sliding movement over at least a portion of a radiator face 50. In one embodiment, the cleaning assembly 45 includes a fluid delivery device, such as air knife 55 (
In other embodiments, an assembly, such as a reversible fan, may be used to move cooling air in one direction through a radiator and to reverse the airflow direction to blow debris from the radiator as described in further detail below. In other embodiments, an assembly may be associated with a filter or screen for cleaning such filter or screen of debris or fluids such as particulate matter, water, or oil.
Preferably, cleaning bracket 60 and the guide assembly interact via a low friction interface by using a low friction material such as polyoxymethylene to make at least a portion of the guide assembly, the cleaning bracket 60, or both. For example, the portion of cleaning bracket 60 through which apertures 65 pass may be made of polyoxymethylene or other suitable low friction material, or a suitable low friction material may line apertures 65. A fluid conduit 70 is attached to the air knife 55 for delivering pressurized air to air knife 55. Preferably, the outlet of the fluid delivery device is arranged to move fluid substantially normal to the radiator face 50 and through the radiator 15. Fluid may be directed through the radiator 15 via the radiator cleaning apparatus 10 in a direction opposite to the direction in which a fan, not illustrated, either pushes or pulls air through the radiator 15. Providing fluid via the radiator cleaning apparatus 10 where such fluid is moved in a direction opposite to the direction in which a fan moves air through the radiator 15 may, singularly or in any combination, cause debris to blow-off of the fins of the radiator 15, inhibit a build-up of debris on the radiator 15, or inhibit debris from binding to the fins of radiator 15. In some embodiments, fluid is directed through the radiator 15 via the radiator cleaning apparatus 10 in the same direction as the direction in which a fan either pushes or pulls air through the radiator 15 to, singularly or in any combination, cause debris to blow-off of the fins of the radiator 15, inhibit a build-up of debris on the radiator 15, or inhibit debris from binding to the fins of radiator 15. The captive fluid conduit 70 is received in a guide 75 for sliding motion. The guide 75 is attached to the upper bracket 30.
In operation, a vehicle operator stops a vehicle equipped with cleaning apparatus 10 and connects the end 80 of the fluid conduit 70 to a pressurized air source, such as shop air at 90 pounds of pressure per square inch (psi). Other sources of pressurized air may be used, and, generally, a higher pressure air results in a greater cleaning ability for the cleaning apparatus 10. The operator then manually raises and lowers the cleaning apparatus 10 one or more times, for example, by manipulating the fluid conduit 70, to remove debris such as from between the fins of radiator 15. The guide assembly maintains the orientation of the air knife 55 with respect to the radiator face 50 while the cleaning apparatus is moved. Optionally, the guide assembly also maintains a relatively constant distance between the air knife 55 and the radiator face 50. The pressurized air source is disconnected from the fluid conduit 70 and operation of the vehicle resumes.
In other embodiments, the pressurized air source may reside on the vehicle so the operator does not need to connect and disconnect the fluid conduit 70 and the pressurized air. In other embodiments, an optional actuator, such as a linear actuator, or a device configured to rotate threaded rod 135 (
In other embodiments, the guide may be horizontal instead of vertical, and the cleaning apparatus 10 may move across a radiator 15 instead of up and down the radiator 15.
A method of attaching the cleaning apparatus 10 to an in-square or to an out-of-square radiator 15 is described with reference to
Typically, a radiator 15 will have a radiator lower bracket 85 that assists supporting the radiator 15 in a vehicle (not illustrated for clarity). There is commonly a channel 90 formed between the radiator 15 and its supporting radiator lower bracket 85. The bottom bracket 20 is preferably rigidly affixed proximate to the bottom end 25 of radiator 15 by sliding a portion of the bottom bracket 20 into the channel 90. For example, a clearance fit into the channel 90 may permit some movement of the bottom bracket 20 with respect to the radiator lower bracket 85 that is restricted by contact between the bottom bracket sidewalls 100 and the radiator lower bracket 85. Preferably, bottom bracket 20 is inserted into channel 90 with a location interference fit where movement in the direction of radiator left side 105 and right side 110 is also restricted by contact between bottom bracket sidewalls 100 and the radiator lower bracket 85. In other embodiments, the bottom bracket 20 may be rigidly affixed proximate to the bottom end 25 of radiator 15 using bolts, welding, or other suitable means. Preferably, the bottom bracket 20 is not indexed to the radiator 15, in other words, the angular relationship between bottom bracket 20, the radiator bottom end 25, the radiator left side 105, and the radiator right side 110 is not important.
A guide assembly for guiding the cleaning assembly 45 along the radiator face 50 is rigidly attached to the bottom bracket 20. In one embodiment, a guide assembly comprises two rods 40 that are made from a high stiffness, low friction, and dimensionally stable material such as polyoxymethylene, ultra high molecular weight polyethylene, polyamide-imide, polyether ether ketone, or other suitable material, that are rigidly affixed to the bottom bracket 20 by screws and lock washers, an interference fit, matching threads cut into the rods 40 and apertures in the bottom bracket 20, bolts, or other suitable means. Other guide assemblies may include one or more T-shaped or C-shaped rails or other suitable guiding structures rigidly affixed to a bottom bracket, such as bottom bracket 20. Preferably, the guide assembly is positioned toward the left side 105, the right side 110, or both, of the radiator 15 to minimize impact on air flow through radiator 15. In some embodiments, the guide assembly may be rigidly affixed to the bottom bracket 20 before bottom bracket 20 is rigidly affixed proximate to the radiator bottom 25.
Upper bracket 30, which includes two elongate sections 31 in the illustrated embodiment, is non-rigidly joined to the guide 75, for example using bolts and nuts that are threaded together, but not tightened. One purpose for non-rigidly joining the upper bracket 30 to the guide 75 is to permit movement between the upper bracket 30 and the guide 75 to facilitate aligning the guide assembly, such as rods 40, and the cleaning assembly 45 with the upper bracket 30 and guide 75 combination to facilitate sliding movement of the cleaning assembly 45 over the guide assembly.
The cleaning assembly 45 comprises an air knife 55 having an air knife cover 115 affixed to a cleaning bracket 60. Exemplary air knives include the Exair® Super Air Knife™ manufactured by Exair® Corporation of Cincinnati, Ohio, and the Standard Air Blade™ manufactured by Next Flow™ Air Products Corp. of Richmond Hill, Ontario. An air knife cover 115 preferably protects the air knife 55 from damage caused by impinging debris and from becoming clogged with debris. The cleaning assembly 45 also comprises a fluid conduit 70 communicating with an air plenum of air knife 55, for example, via a threaded connection that is optionally sealed by a liquid or solid sealant, for example, polytetrafluoroethylene tape. While it is preferred that the fluid conduit is a rigid pipe, the fluid conduit may be made from other materials, or combinations of materials, such as flexible hosing, semi-rigid hosing, or other suitable material.
The cleaning assembly 45 is engaged to the guide assembly in a sliding manner. For example, rods 40 are passed through apertures 65 in cleaning bracket 60. Rods 40 have an outer diameter and apertures 65 have an inner diameter that facilitates cleaning assembly 45 sliding over rods 40. For example, rods 40 may have an outer diameter of approximately 0.5 inch and apertures 65 may have an inner diameter of approximately 0.75 inch, but other suitable sizes and clearances between the cleaning assembly and the guide assembly may be used. Optionally, the cleaning bracket 60 may have circularly arranged brushes surrounding each aperture 65 that are sized and arranged to contact rods 40 to facilitate removing debris from the rods 40 as the cleaning assembly 45 slides over rods 40. Such circular brushes, if included, may also hinder particle from entering into and accumulating in the apertures 65.
The end 80 of fluid conduit 70 slides through the guide 75. Fluid conduit 70 has an outer diameter and the aperture 76 in the guide 75 has an inner diameter that facilitates the cleaning fluid conduit 70 sliding through guide 75. For example, the fluid conduit 70 may have an outer diameter of approximately 0.75 inch to approximately 1.00 inch and the aperture 76 may have an inner diameter of approximately 0.78 inch to approximately 1.03 inch, but other suitable sizes and clearances may be used. Optionally, the guide 75 may have circularly arranged brushes surrounding the aperture 76 that are sized and arranged to contact the fluid conduit 70 to facilitate removing debris from fluid conduit 70 as the fluid conduit 70 slides through the aperture 76.
The upper bracket 30 is rigidly secured proximate to the top end 35 of the radiator 15. Typically, the radiator 15 will have a radiator top bracket 120 that assists supporting the radiator 15 in the vehicle. There is commonly a channel 125 formed between the radiator 15 and its supporting radiator top bracket 120. The upper bracket 30 is preferably rigidly affixed proximate to the top end 35 of the radiator 15 by sliding a portion of the upper bracket 30 into the channel 125 and securing the upper bracket 30 to the radiator top bracket 120, for example, using screws, bolts, welding, or other suitable means. Preferably, the upper bracket 30 is not indexed to the radiator 15, in other words, the angular relationship between the upper bracket 30, the radiator top end 35, the radiator left side 105, and the radiator right side 110 is not important.
The guide assembly for guiding the cleaning assembly 45 along the radiator face 50 is rigidly attached to the upper bracket 30. For example, rods 40 are rigidly affixed to the upper bracket 30 by screws and lock washers, an interference fit, a threaded portion cut into the rods 40 extending through apertures in the upper bracket 30 and secured to the upper bracket 30 by nuts, or other suitable means.
Optionally, the cleaning assembly 45 is slid over the guide assembly to ensure that the cleaning assembly does not substantially bind, for example, when released the cleaning assembly free-falls to the bottom bracket 20. If the cleaning assembly 45 binds when slid over the guide assembly, the guide 75 may be moved until the cleaning assembly 45, the rods 40 and the guide 75 facilitate substantially non-binding movement of the cleaning assembly 45. The guide 75 is rigidly affixed to the upper bracket 30, for example by tightening nuts and bolts.
Optionally, regardless of whether the cleaning apparatus 10, or other suitable apparatus such as a reversible fan, is manually or automatically actuated, a cleaned component parameter, such as fluid flow through the component, component cooling capability, or other suitable condition, singularly or in any combination, are monitored to determine whether the cleaning apparatus 10 needs assistance, for example, to remove debris from the cleaned component. In one embodiment, a baseline airflow through the radiator 15 may be sensed or measured when the radiator 15 is known to be substantially free of debris and such baseline airflow may be communicated to a processor (not illustrated). During use, an airflow sensor detects an initial airflow on a side of the radiator 15 that is opposite the cleaning apparatus 10 and communicates the initial airflow to the processor. In some embodiments, the processor may determine that the cleaning apparatus 10 may not be able to sufficiently remove debris from the radiator 15 based on the initial airflow. For example, a predefined initial airflow may be defined, below which the processor is programmed to alert an operator that the cleaning apparatus will likely need assistance removing debris from the radiator.
In other embodiments, the airflow sensor also detects airflow subsequent to the initial airflow and communicates such airflows to the processor. The processor analyzes the various airflows received from the airflow sensor and determines whether the cleaning apparatus needs assistance removing debris from the radiator 15 based on the airflow analysis. A determination that additional assistance is needed may be based on detecting, singularly, or in any combination, an insufficiently increased airflow through the radiator 15, a final airflow that is substantially the same as the baseline airflow, or other suitable indicator.
Other sensors may be used to detect other conditions that indicate the cleaning device is likely to need assistance clearing a fluid passage. For example, optical sensors may detect an amount of blockage, temperature or fluid demand sensors may indirectly detect an amount of blockage, or contact or power requirement sensors may detect an interference with movement of the cleaning device that indicates the cleaning device is likely to need assistance clearing a fluid passage.
For example, the processor may compare a final airflow against the baseline airflow to determine whether sufficient debris has been removed such that the radiator 15 is substantially free of debris. Or, the processor may compare an initial airflow against a final airflow to determine whether the cleaning apparatus needs assistance such as by determining that the final airflow is less than a predetermined percentage greater than the initial airflow. Optionally, if the vehicle is equipped with a hydraulic fan to move air through the radiator 15, the processor may slow the fan speed in response to determining that the cleaning device 10, or the hydraulic fan itself, has removed sufficient debris from the radiator 15 to reduce the overall amount of energy consumed by the vehicle.
As another example, a processor may monitor the temperature of the fluid flowing within the radiator 15. The temperature of the fluid flowing within the radiator 15 before actuating the cleaning device 10 is compared against the temperature of the fluid flowing within the radiator 15 at a predetermined time, for example, approximately 5 seconds, after cessation of actuating the cleaning device 10. If a sufficient temperature drop in the fluid flowing within the radiator 15 is not present within the predetermined time, for example, in a range of approximately 5 degrees to approximately 30 degrees, the processor signals that the cleaning device 10 needs assistance to remove debris from the radiator 15.
As another example, a processor may monitor a thermostat associated with the radiator 15 to determine a demand for coolant. The demand for coolant before actuating the cleaning device 10 is compared against the demand for coolant at a predetermined time, for example, approximately 5 seconds, after cessation of actuating the cleaning device 10. If the demand for coolant does not drop by a predetermined amount within the predetermined time, the processor signals that the cleaning device 10 needs assistance to remove debris from the radiator 15.
As another example, a processor may monitor movement of the cleaning device via a signal from a sensor, such as cleaning device 10, either across a face of a fluid passage or through a fluid passage, for example, by monitoring for an increase in electrical power needed to move the cleaning device. An increase in the amount of power needed to move the cleaning apparatus may indicate there is interference with moving the cleaning device, such as an object stuck to or in a fluid passage that blocks or partially blocks the travel path of the cleaning device, or dirt adhered to portions of the cleaning device. Such interference with movement of the cleaning device may cause damage to the cleaning device, the fluid passage, or both if additional power is supplied to move the cleaning device. For example, a stick wedged between the fins of radiator 15 could obstruct movement of the cleaning device 10 and power supplied to an actuator to move the cleaning device 10 into contact with the stick may damage the fins of the radiator 15, or may cause structure of the cleaning device 10 to bend. Any such damage may reduce the cooling efficiency of the radiator 15, or may increase the power needed to move the cleaning device 10 regardless of whether there is an obstruction because of the bent condition of portions of the cleaning device 10.
In some embodiments, the processor is configured to stop the cleaning device from moving in response to receiving a signal indicating that movement of the cleaning device is hindered. In other embodiments, the processor is configured to de-rate a vehicle component in response to receiving a signal indicating that a cleaning device will likely need assistance clearing a fluid passage, for example, an engine's operating speed may be limited or shut-off. In other embodiments, the processor is configured to send a signal to a remote location, for example, via a vehicle telematics system in response to receiving a signal indicating that a cleaning device will likely need assistance clearing a fluid passage.
While exemplary embodiments have been shown and described, which are preferably relatively inexpensive and easy to maintain it will be apparent to those skilled in the art that modifications and variations can be made without departing from the spirit and scope of the invention as defined by the below claims. For example, a cleaning assembly, guide assembly, bottom bracket and upper bracket may be suitably sized, arranged and located to facilitate cleaning an intake filter, such as a vehicle's air filter, or a screen on a vehicle. A cleaning assembly, guide assembly, bottom bracket and upper bracket may be suitably sized, arranged and located to facilitate cooling a fluid that is circulating through a radiator. A cleaning assembly or cooling assembly may be connected to a pressurized fluid source residing on a vehicle, to a drive mechanism for moving the cleaning assembly via operation of a switch located in a driver area of the vehicle, or both.
| Number | Date | Country | |
|---|---|---|---|
| 61761614 | Feb 2013 | US |
