SELF-CLEANING FILTER ARRANGEMENT WITH ACTIVATION SIGNAL FOR FLOOR CARE APPARATUS
A floor care apparatus has a filter with an intake and out take. A first pressure sensor is arranged on the intake while a second pressure sensor is arranged on the out take. A controller connects to the sensors to receive signals indicative of relative pressure. Whenever a predetermined pressure differential between the signals is achieved, an undesirable load on the filter is deemed occurred and initiation of a self-cleaning of the filter begins. In this manner, filter cleaning only occurs on an as-needed basis and user intervention is avoided, thereby adding convenience. The controller is also able to ascertain a clogged airway condition. Various features contemplate pressure sensor signals arranged to scale suction as positive pressures, meeting the predetermined pressure differential at other than a maximum pressure differential between the first and second pressure sensors, and scaling the predetermined pressure differential relative to the maximum pressure differential.
The present invention relates generally to the floor care field. More particularly, it relates to a floor care apparatus, such as a canister or upright vacuum cleaner, having a self-cleaning filter and arrangement therefor. Particular aspects relate to activation of signals initiating self-cleaning, without user intervention, and doing so only on an as-needed basis.
BACKGROUND OF THE INVENTIONWhether canister or upright, vacuum cleaners in all of their designs and permutations have become increasingly popular over the years. In general, vacuum cleaners incorporate a suction fan motor, attendant dirt cup or dust bag and a nozzle assembly fluidly and mechanically connected to one another that suck up dirt and dust during operator movement across a dirt-laden floor. Specifically, an agitator within the nozzle assembly rotates to beat the nap of a carpet and dislodge dirt and dust during a time when an operator manipulates the cleaner back and forth. Dirt and dust then enter the cleaner and flow in an airstream toward the motor. Upstream of the motor, the dust and air are separated and particles are trapped in the dirt cup or dust bag. Upon filling, the dirt cup or dust bag can be emptied or discarded and the process repeated.
While dirt cups allow users to visually inspect whether the cup is full and requires dumping, filters associated with the cups become saturated with fine particles during filling. Over time, such fine particles restrict airflow and reducing cleaning efficiency of the vacuum cleaner. Eventually the cleaning efficiency of the vacuum cleaner becomes so impaired it is necessary for the operator to either clean or replace the filter in order to achieve the desired level of cleaning. However, filter cleaning and replacement requires manual user intervention, and both can be messy. Filter cleaning performed unnecessarily also acts to prematurely fail the filter material.
Accordingly, the floor care arts have need of simple, yet effective, arrangements for truly self-cleaning filters that minimize or eliminate user involvement. They should also only operate when necessary to extend filter service life and increase cleaning efficiency. Naturally, any improvements should further contemplate good engineering practices, such as relative inexpensiveness, stability, ease of implementation, low complexity, etc.
SUMMARY OF THE INVENTIONIn accordance with the purposes of the present invention as described herein, an improved floor care apparatus is provided. The apparatus may take the form of a canister or an upright vacuum cleaner or may embody an extraction cleaning device or other hereinafter developed product. In this regard, the present invention relates to a vacuum cleaner, extractor or the like equipped with a more efficient and effective filter cleaning mechanism. Advantageously, the present invention allows for the quick and easy automatic cleaning of dirt and debris from a filter including particularly fine particles from the pores of the filter. As a result each filter has a longer service life and the apparatus may be operated at a higher cleaning efficiency over the entire length of that extended service life.
In one embodiment, a floor care apparatus has a filter with an intake and out take. A first pressure sensor is arranged on the intake while a second pressure sensor is arranged on the out take. A controller connects to the sensors to receive signals indicative of relative pressure. Whenever a predetermined pressure differential between the signals is achieved, an undesirable load on the filter is deemed having occurred and initiation of a self-cleaning of the filter begins. In this manner, filter cleaning only occurs on an as-needed basis and user intervention is avoided, thereby adding convenience. The controller is also able to ascertain a clogged airway condition. Various features contemplate pressure sensor signals arranged to scale suction as positive pressures, meeting the predetermined pressure differential at other than a maximum pressure differential between the first and second pressure sensors, and scaling the predetermined pressure differential relative to the maximum pressure differential.
In other embodiments, the controller operates with a visual indicator to indicate a self-cleaning operation or clogged airway condition. Pressure sensors also typify diaphragms, transducers, or the like. Filters are of the type found in dirt cups of bagless vacuum cleaners or other.
In the following description there is shown and described possible embodiments of the invention, simply by way of illustration of one of the modes best suited to carry out the invention. As it will be realized, the invention is capable of other different embodiments, and its several details are capable of modification in various, obvious aspects all without departing from the invention. Accordingly, the drawings and descriptions will be regarded as illustrative in nature and not as restrictive.
The accompanying drawings incorporated in and forming a part of the specification, illustrate several aspects of the present invention, and together with the description serves to explain the principles of the invention. In the drawings:
In the following detailed description of the illustrated embodiments, reference is made to the accompanying drawings that form a part hereof, and in which is shown by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention and like numerals represent like details in the various figures. Also, it is to be understood that other embodiments may be utilized and that process, mechanical, electrical, arrangement, software and/or other changes may be made without departing from the scope of the present invention. In accordance with the present invention, methods and apparatus for self-cleaning floor care apparatus and attendant control, including activation signal are hereinafter described.
Reference is now made to
Also, the canister assembly 18 carries an internal chamber 32 that houses a suction generator or fan motor 33 (i.e. a state of the art fan and motor combination) and a dust bag 34 for removing dirt or dust entrained in the air stream as it passes in an airflow path from the nozzle assembly 16 to the suction fan motor. During use, the suction fan motor 33 creates the suction airflow in a well known manner.
In the nozzle assembly 16, a nozzle and agitator cavity 36 houses an agitator 38. The rotary scrubbing action of the agitator 38 and the negative air pressure created by the suction fan motor 33 cooperate to brush and beat dirt and dust from the nap of the carpet being cleaned and then draw the dirt and dust laden air from the agitator cavity 36 to the dust bag 34. Specifically, the dirt and dust laden air passes serially through a suction inlet and hose (not shown) and/or an integrally molded conduit in the nozzle assembly 16 and/or canister assembly 18 as is known in the art. Next, it is delivered into the chamber 32 and passes through the porous walls of the dust bag 34. The bag 34 serves to trap the suspended dirt, dust and other particles inside while allowing the now clean air to pass freely through the wall thereof. Clean air then flows through the suction fan motor 33, final filtration cartridge, including filter 42, and to the environment through the exhaust port 44.
With reference to
In either floor care apparatus embodiment, the cleaners have a dust bag and filter within a housing configured to enable the indication to users of a replace filter, cleaning of filter required, or clogged airway condition during use.
With reference to
The operation of the airflow through the dirt cup 50 will now be described in greater detail with reference to
The present invention, in one aspect, allows the filter 52 to be self-cleaned in situ in a very convenient and efficient manner. Specifically, with reference to
With reference to
In
Also, the sorting of relative differences between signals of the pressure sensors may be further enhanced via comparison to a reference pressure PR stored, for example, as a single or table of values in an attendant memory M. In this regard, reference pressures include, but are not limited to, an ambient pressure external to the floor care apparatus, a minimum pressure that must be overcome before providing any visual indications to users, or boundary conditions that must be satisfied. The memory also contemplates resetting functionality that occurs when users empty dirt cups, replace full dust bags with new, empty ones, or clean or replace filters.
In other embodiments,
It should also be understood that due to pressure sensor PA,
The foregoing was chosen and described to provide the best illustration of the principles of the invention and its practical application to thereby enable one of ordinary skill in the art to utilize the invention in various embodiments and with various modifications as are suited to the particular use contemplated. All such modifications and variations are within the scope of the invention as determined by the appended claims when interpreted in accordance with the breadth to which they are fairly, legally and equitably entitled. Relatively apparent modifications, of course, include combining the various features of one or more figures with the features of one or more of other figures.
Claims
1. A floor care apparatus, comprising:
- a filter with an intake and out take; and
- a first pressure sensor arranged on the intake and a second pressure sensor arranged on the out take, wherein a predetermined pressure differential between the first and second pressure sensors indicates an undesirable load on the filter and causes activation of a signal to initiate a self-cleaning of the filter.
2. The floor care apparatus of claim 1, wherein a controller responds to the predetermined pressure differential between the first and second sensors and causes the activation of the signal.
3. The floor care apparatus of claim 2, wherein the controller distinguishes between the signal to initiate the self-cleaning of the filter and a clogged airway.
4. The floor care apparatus of claim 1, further including a visual display identifying the self-cleaning of the filter.
5. The floor care apparatus of claim 3, further including a visual display identifying the clogged airway.
6. The floor care apparatus of claim 3, wherein the controller distinguishes between the signal to initiate the self-cleaning of the filter and the clogged airway by comparison to a predetermined threshold.
7. The floor care apparatus of claim 1, wherein the filter is disposed in a dirt cup.
8. The floor care apparatus of claim 1, wherein the first and second pressure sensors are both arranged to scale suction of the floor care apparatus as positive pressures.
9. The floor care apparatus of claim 1, wherein the predetermined pressure differential is a pressure differential other than a maximum pressure differential between the first and second pressure sensors.
10. The floor care apparatus of claim 9, wherein the pressure differential other than the maximum pressure differential is in a range from about one-half to about three-quarters percent of the maximum pressure differential.
11. The floor care apparatus of claim 1, wherein the filter is not a dust bag.
12. A floor care apparatus, comprising:
- a filter with an intake and out take;
- a first pressure sensor arranged on the intake and a second pressure sensor arranged on the out take, both the sensors providing a signal indicative of pressure; and
- a controller in receipt of the signals from the sensors, wherein a predetermined pressure differential between the signals indicates an undesirable load on the filter and causes activation of another signal to initiate a self-cleaning of the filter, the controller able to distinguish between the signals from the sensors to either initiate the self-cleaning of the filter or to indicate a clogged airway condition.
13. The floor care apparatus of claim 12, wherein the first and second pressure sensors are both arranged to scale suction of the floor care apparatus as positive pressures in a range between 0 and about 3 psi.
14. The floor care apparatus of claim 12, wherein the predetermined pressure differential is a pressure differential other than a maximum pressure differential between the first and second pressure sensors.
15. The floor care apparatus of claim 14, wherein the pressure differential other than the maximum pressure differential is in a range from about one-half to about three-quarters percent of the maximum pressure differential.
16. The floor care apparatus of claim 12, further comprising a visual indicator to indicate a self clean, replace filter, or clogged airway condition.
17. A method of using a floor care apparatus, comprising:
- providing a filter with an intake and an out take;
- arranging a first pressure sensor on the intake and a second pressure sensor on the out take;
- determining a pressure differential between the first and second pressure sensors; and
- initiating a self-cleaning of the filter based on the determining.
18. The method of claim 17, wherein the initiating the self-cleaning occurs when the pressure differential reaches a predetermined value.
19. The method of claim 18, further including connecting a controller to the first and second pressure sensors for ascertaining whether the pressure differential reaches the predetermined value.
20. The method of claim 17, wherein the determining further includes calculating a maximum pressure differential.
21. The method of claim 17, further including ascertaining a clogged airway condition.
22. The method of claim 17, further including providing a visual indicator to indicate a self clean, replace filter, or clogged airway condition.
Type: Application
Filed: Feb 23, 2007
Publication Date: Aug 28, 2008
Inventors: Gary P. Charbonneau (Clifton Park, NY), Kerry L. Dever (Lexington, KY)
Application Number: 11/678,339
International Classification: A47L 9/10 (20060101);