MXPA96004184A - Fil condition detector and indicator - Google Patents
Fil condition detector and indicatorInfo
- Publication number
- MXPA96004184A MXPA96004184A MXPA/A/1996/004184A MX9604184A MXPA96004184A MX PA96004184 A MXPA96004184 A MX PA96004184A MX 9604184 A MX9604184 A MX 9604184A MX PA96004184 A MXPA96004184 A MX PA96004184A
- Authority
- MX
- Mexico
- Prior art keywords
- filter
- thermal resistance
- air flow
- flow path
- resistance
- Prior art date
Links
- 238000009795 derivation Methods 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 230000035945 sensitivity Effects 0.000 claims description 3
- 238000009423 ventilation Methods 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 4
- 230000000007 visual effect Effects 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 230000001808 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 241000271566 Aves Species 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000000875 corresponding Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000004301 light adaptation Effects 0.000 description 1
- 230000000414 obstructive Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001376 precipitating Effects 0.000 description 1
Abstract
The present invention relates to a detector and filter condition indicator for responding to the presence of a predetermined collection of material in a filter operatively positioned at an outlet of the air flow path, characterized in that it comprises: a small derivation of the path of the air flow connected to the outlet of the air flow path and separated from the filter, a thermal resistance heated in the drivation of the air flow path, and an indicator light electrically connected in series in a circuit with the resistance heated thermal that illuminates when the resistance in the circuit decreases due to the predetermined cooling of the heated thermal resistance, where a predetermined collection in the filter increases the air flow in the small branch of the air flow path to cool the resistance thermally heated and decrease the resistance in the circuit to illuminate the Indicator light, and a multiple speed fan at the outlet of the airflow path, said thermal resistance being electrically coupled to means for changing the voltage and current through the thermal resistance depending on the ventilation setting.
Description
DETECTOR AND FILTER CONDITION INDICATOR
BACKGROUND OF THE INVENTION
The present invention relates to a detector and filter condition indicator, and more particularly, to a detector and filter condition indicator that responds to the presence of a predetermined collection of material in a filter that is positioned operatively in an exit from the
air flow path which may include a multiple speed fan. In a product - such as a cleaner, suction cleaner or other product that contains a filter, it is desirable to know when the filter is clogged as this may be
adversely affect its performance. Typically, a blocked filter is one in which the pressure drop t increases backwards from the MU ro. The previous technique has suggested several ways in which a clogged filter can be indicated to a user. The
: > ü patent of FT.U.fl. No. 4,050,291 discloses heated thermal resistors used in a bridge circuit with a de-reader and filter indicator device; The patent of E.U.ñ. No. 4,040,042 would teach the use of a current sensing resistor in a blower energizing circuit; and the patent of E.U.fl. Do not.
.5,240,072 discloses an energy detector in the form of a closed-circuit magnetic flux-conducting circuit.
All of these previous techniques have proven to be useful for certain applications. It becomes more complicated to delect the condition of? N iltro and provide a visual indication of the filter to the user b when a multiple speed velocity fan is used in a product such as any of the identified ones. When the fan speed changes, the speed ii through the filter also changes, and this may cause the indicator to "fire" when the filter is not clogged or to fail to indicate a clogged fi lter. The present invention has been specifically designed to solve the aforementioned problems in a new and improved construction not taught and previously suggested by the prior art. 5 BRIEF DESCRIPTION OF THE INVENTION
Among the various objects and advantages of the present invention include: 0 A new and improved detector * and filter condition indicator for a product such as a cleaner, suction cleaner or other similar product-containing a filter; the provision of the detector and filter condition indicator mentioned above that is separated from an output of the
.5 trajectory of the air flow that contains the filter; the provision of the detector and filter condition indicator mentioned above in which a small derivation of the air flow path with a heated thermal resistance illuminates when the resistance in an electrical circuit containing the thermal resistance decreases and the indicator light; the provision of the detector and filter condition indicator mentioned above in which the thermal resistance is electrically coupled to means for changing the voltage and current through the thermal resistance where a multiple speed fan is located in the
output of the air flow path; the provision of the aforementioned filter condition indicator and detector which is simple, durable, economical, requires little maintenance and is otherwise well suited for the purposes intended. L5 Briefly stated, the filter condition detector and indicator of the present invention responds to the presence of a predetermined collection of material in a Mitro that is operatively positioned at an outlet of the air flow path. It connects a small
? 0 derivation of the air flow path at the outlet of the air flow path and separated from the filter. A heated thermal resistance is placed on the bypass of the air flow path. Electrically connected in series in a circuit with heated thermal resistance, this
, 5 an indicator light that illuminates when the resistance in the circuit decreases due to the re-defined cooling of the heated thermal resistance. In this way, a predetermined collection of material in the filter increases the amount of air in the small bypass of the flow path of the reactor to cool the heated thermal resistance and decrease the resistance in the partial circuit. To illuminate the indicator light, the heated thermal resistance can be connected in series with a resistor whose resistance decreases when the air flow in the bypass of the air flow path increases.
LO preferably a thermal resistance of coefficient e positive temperature by sensitivity of air flow that allows rapid change of resistance. The small derivation of the air flow path can be extended through the filter or filter force,
L5 depending on the construction that is desired. Where a multi-speed fan is located at the outlet of the airflow path, the thermal resistance is electrically coupled to means to change the voltage and current through the resistance
thermal, depending on the structure of the fan. The aforementioned means may comprise connected coils of a multiple speed motor that operates the multiple speed fan. The means mentioned above may also comprise a switch that changes the resistance in the
,. '5 thermal resistance when changing fan speed. These and other objects and advantages will be given from the description that yes.
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawings, Figure 1 is a fragmentary perspective view of a top area of a cleaner showing a multiple speed fan and an output of the air flow path containing a filter; Figure 2 is a side elevational view
The fragmentary LO, partially in section, in various ways in which the heated thermal resistance can be used in a separate branch of the air flow path in accordance with the present invention; Figure 3 is a schematic view of a typical electric circuit I b used in connection with a detector and filter condition indicator of the present invention; and Figure 4 is a graphic illustration showing resistance and temperature in relation to dirty and clean air flow through a filter. , '0 Corresponding reference numbers will be used throughout all the different figures of the drawings.
DESCRIPTION OF THE PREFERRED HODQLIDflDES
The following detailed description illustrates the invention by way of example and not by way of limitation. This description clearly allows a person skilled in the art to make- and use- the invention, and describes various modals, adaptations, variations, alternatives and uses of the invention, including what is currently believed to be the best way to effect this invention. . Although the filter condition detector and indicator of the present invention can be used in a variety of different products such as a hunter, a suction cleaner or any other product containing a filter, the
Figure 1 of the drawings describes the present invention in relation to a humidor. At the upper end of the humidifier 1 is a compartment 3 containing a motor-driven multiple speed fan blade 5 which is positioned at an exit of the motor's path.
air flow 7 to draw air through the humidifier, as is well known. On one side of the humidifier 1 is a filter 9 that is typically associated with an air path (not shown) for trapping foreign particles and other debris that are entrained within the fermenter 1 by the paddle 5.
? f) of the multiple speed fan driven by motor. A molded grating (not shown) is typically mounted on the high part of the humidor 1, to cover one or more of the compar i ientos and the palette 5 of the speed fan rn? l t i l. As indicated before, it is important to detect the condition of the filter 9 to provide a visual indication to a user when the filter has become clogged. As will be appreciated, a clogged filter can adversely affect the performance of a product, such as the cleaner 1. This problem becomes more complicated when using a multi-speed fan, or in the fan blade of the multiple speed fan. motor driven in Figure L. When the speed of the fan blade * changes, the air velocity through the filter also changes and this can cause any indicator and filter condition detector to fire "when the filter is not clogged or fails to indicate that a filter is clogged. In order to solve these problems, the present invention describes a new and improved detector and filter condition indicator that responds to the presence of a predetermined collection of material in the filter that can be cloned operatively in an output of the filter. air flow path, which may include * a multiple speed fan, such as the means illustrated in Figure 1 of the drawings. Adjacent to the compartment 3 in the humidifier 1 is a compartment 11 which may contain several electrical conduits shown in dotted lines, as well as a heated thermal resistance 13 which is used in connection with the filter 9. Alternatively, a resistance can be provided 15 in a compartment 17, adjacent to the side of compartment 3, if desired.
This is best illustrated in Figure 2 of the drawings in which a thermal resistance 13 is shown as used in connection with the filter 9 as well as with the arrangement (alternative to a thermal resistance 15 which may be in the compartment). separate 17 .. Whichever construction is used, it is important that a small branch of the airflow path be connected to the outlet of the flow path of air 7 separated from the filter 9. As shown in the figure 2 of the drawings, the heated thermal resistance 13 is placed in a separate branch of the air flow path 19 which extends to birds of it but allows air to flow around the filter 9. The separate branch of the flow path of air 19 is connected to the different compartments at the upper end * of the wiper 1 at the outlet of the air flow path 7. Alternatively, the hot thermal resistance 15 can be placed on the outside. n the separate comparison 17 constituting a small derivation of the air flow path which is also connected to the outlet of the airflow path 7 separated from the filter 9. In the case of the small derivation of the path of air flow 17 in separate compartment, an air outlet 21 is necessary to allow air to pass through the small derivation of the flow path of < - i 17 will be discharged out of the air outlet 21. As shown in the illustration granea in figure 4 of the drawings, the air velocity increases in the small derivation of the air flow path 17 or 19, due to the obstruction in the filter 9, the thermal resistance 13 or 15 '- it was cooled more and its resistance decreases. By using a positive temperature coefficient (PTC) thermal resistance for the thermal resistors 13 or 15 and coupling it in series with a resistor, the increased air velocity in the small branch of the air flow path 17 or 19 can become more precipitating so that, even at low air flow, the resistance at the thermal resistance 13 or 15 is very high and at a certain increased air flow, the heated thermal resistances 13 or 15 can be diverted to a much higher resistance. less. This large resistance change can be used to light an indicator through the thermal resistors 13 or 15 over a resistor in series with any of the thermal resistors 13 or 15. Figure 3 of the drawings shows a typical electrical circuit 23 used in connection with the filter condition detector or indicator of the present invention. On the left side of the circuit 23, a switching switch 25 is shown operating between low, medium or high positions by controlling the multiple speed fan blade driven by the motor. The thermal resistance 13 illustrated in Figure 3 (which could be the thermal resistance 15 as well) is electrically coupled to the connected coils 27 of a multi-speed motor (not shown) operating the vane 5 of the multiple speed fan * driven by-motor. A resistor 29 extends to tr-birds of the circuit 23 in conjunction with the Indicator Light 31. A separate ion generator 33 may also be coupled to an ion light 35 through a manual switch 37 in the electrical circuit 23, if desired . Also, an energy light 39 can be used to indicate energy in the system. Coupling the thermal resistance 13 with the connected coils 2? of a multiple speed motor (not shown) the voltage and current through the thermal resistance can be changed, depending on the structure of the fan. Connected coils 27 of the multiple speed motor (not shown) are effectively used as an autotransformer to change * the applied voltage to (and the current through) the thermal resistance 13 and the series resistor 29, depending on the structure from the fan. In this way, at high speed of the fan, the voltage to tr-birds of the thermal resistance 13 and the resistor of series 29 increases, so that a higher air velocity is required in one or the other of the small derivations of the flux tectonics from a? r * e 17, 19 to indicate a clogged filter. In this way, the effects of the palette 5 of the motor-driven multiple speed velocity visor can be compensated for. The thermal resistance indicator light 31 is electrically connected in series with the heated thermal resistance 13 for illumination when the resistance in circuit 23 decreases due to a predetermined cooling of the heated thermal resistance. As a result, a predetermined collection of material in the filter 9 increases the air flow in the small branch of the air flow path 17 or 19, to cool the heated thermal resistance 13 or 15 for the decrease in air flow. the resistance in the circuit, such as by the resistor 29, to illuminate the indicator light 31. Preferably, the thermal resistance 13 or 15 is a thermal resistance of positive temperature coefficient (PCT) by sensitivity of that allows fast change of resistance, instead of using * the connected coils 27 of a multi-speed motor (not shown) to change the voltage and comment it through the thermal resistance 13 when using a palette of multiple speed fan driven by motor 5, a switch can also be used that changes the resistance in the thermal resistance when changing the speed of the fan.In any case, the voltage and current through s of the thermal resistance will change depending on the structure of the fan. From the foregoing, it will now be appreciated that the detector and filter condition indicator of the present invention describe a new and improved construction that detects the condition of a filter and provides a visual indication of the filter to a user, such as by light indicator, even if a multi-speed fan is used in a product such as a humidifier, suction cleaner or other such device. Even when you walk the fan speed, the air velocity through the filter will also change, and this will not cause the detector to "trip" when the filter is not clogged or fails to indicate a clogged filter. In view of the foregoing, it will be noted that the various objects and advantages of the present invention have been achieved and that other advantageous results have been obtained. With different changes in the above constructions being made without departing from the scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawings be construed as illustrative and not limiting.
Claims (12)
1. - A detector and filter condition indicator to r-sponder by the presence of a predetermined collection of material in a filter operatively positioned at an outlet of the air flow path, comprising, a small derivation of the flow path of air connected to the outlet of the air flow path and separated from the filter; a thermal resistance heated in the derivation of the air flow path; and an indicator light electrically connected in series in a circuit with the heated thermal resistance that illuminates when the resistance in the circuit decreases due to the predetermined cooling of the heated thermal resistance; where a predetermined collection of material in the filter increases the air flow in the small branch of the air flow path to cool * the heated thermal resistance and decrease the resistance in the circuit to illuminate the indicator light.
2. - The detector and filter condition indicator as defined in claim 1, further characterized in that the heated thermal resistance is also connected in series with a resistor whose resistance decreases when the air flow in the derivation of the flow path increases of air.
3. - A filter detector and indicator as defined in claim 1, further characterized in that the thermal resistance is a thermal resistance of positive temperature coefficient by flow sensitivity
5 air that allows quick change of residence.
4. The filter condition detector and indicator as defined in claim 1, including a multiple speed blade at the outlet of the air flow path, said thermal resistance being electrically coupled to means for changing the voltage and the current through the thermal resistance depending on the structure of the fan.
5. The detector and filter indicator as defined in claim 4, further characterized because the latter
L5 mentioned means comprise connected coils of a multiple speed motor operating the multiple speed fan. ñ. - The detector * and filter condition indicator as defined in claim 4, further characterized 20 because the last mentioned means comprise a switch that changes the resistance in the thermal resistance when changing the speed of the fan.
7. The detector and filter condition indicator as defined in claim 1, further characterized, because the small derivation of the air flow path extends outside the filter.
8. - The detector and indicator of filter condition as defined in claim 1, further characterized in that the small derivation of the air flow path extends through the filter.
9. A detector- and filter condition indicator to respond to the presence of a predetermined collection of material in a filter operatively positioned at an outlet of the airflow path comprising: a small branch of the airflow path connected to the outlet of the air flow path and separated from the filter; a heated thermal resistance in the derivation of the air flow path, said heated thermal resistance being electrically connected in series with a resistor; and an indicator light also electrically connected in series with the heated thermal resistance and the resistor that illuminates when the resistance in the resistor decreases due to the predetermined cooling of the heated thermal resistance; wherein a predetermined collection of material in the filter increases the air flow in the small branch of the air flow path to cool the heated thermal resistance and decreases the resistance in the resistor to illuminate the indicator light.
10.- A detector and filter condition indicator pair-to-sponder the presence of a predetermined collection of material in a filter operatively positioned at an outlet of the airflow path including a filter.
multiple speed fan; a small derivation of the air flow path connected to the outlet of the air flow path and separated from the filter, - a heated thermal resistance in the bypass of the air flow path, said heated thermal resistance being electrically connected in series with a resistor *; an indicator light also electrically connected in series with the heated thermal resistance and the resistor, which is illuminated when the resistance in the resistor decreases due to the predetermined cooling of the heated thermal resistance; and said thermal resistance and resistor being electrically connected to an autotransformor to change the voltage and current through the thermal resistance and the resistor, depending on the structure of the multiple speed fan, wherein a predetermined collection of filter material increases the air flow in the small branch of the air flow path to cool the heated thermal resistance and decrease the resistance in the resistor * to illuminate the indicator light.
11. The filter condition detector and indicator as defined in claim 8, further characterized in that the autotransformer comprises connected coils of a multiple speed motor that operates the multiple speed fan.
12. The detector and filter condition indicator as defined in claim R, further characterized Ir7
because the autotransformer bought a switch that changes the resistance in the resistor when changing the speed of L vent i 1 deco *.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/568,813 US5668535A (en) | 1995-12-07 | 1995-12-07 | Filter condition sensor and indicator |
| US08568813 | 1995-12-07 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| MXPA96004184A true MXPA96004184A (en) | 1997-06-01 |
| MX9604184A MX9604184A (en) | 1997-06-28 |
Family
ID=24272848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| MX9604184A MX9604184A (en) | 1995-12-07 | 1996-09-19 | Filter condition sensor and indicator. |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5668535A (en) |
| EP (1) | EP0778066B1 (en) |
| CA (1) | CA2174691C (en) |
| DE (1) | DE69625027T2 (en) |
| MX (1) | MX9604184A (en) |
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| US4240072A (en) * | 1979-03-19 | 1980-12-16 | Research Products Corporation | Load indicator for an air cleaner |
| US4294595A (en) * | 1980-07-18 | 1981-10-13 | Electrolux Corporation | Vacuum cleaner including automatic shutoff device |
| EP0566479B1 (en) * | 1992-04-14 | 1995-11-15 | Roger Claude Robin | Fouling detector for air filter |
-
1995
- 1995-12-07 US US08/568,813 patent/US5668535A/en not_active Expired - Lifetime
-
1996
- 1996-04-22 CA CA002174691A patent/CA2174691C/en not_active Expired - Lifetime
- 1996-09-06 DE DE69625027T patent/DE69625027T2/en not_active Revoked
- 1996-09-06 EP EP96630054A patent/EP0778066B1/en not_active Revoked
- 1996-09-19 MX MX9604184A patent/MX9604184A/en unknown
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