• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a dust indicator in a vacuum cleaner, wherein the dust indicator (200) is arranged in a wall (102) at least partially delimiting a space of the vacuum cleaner which is under negative pressure relative to the outside of the wall during operation of the vacuum cleaner. Dust indicator comprises an air duct (211) having an air inlet (212) arranged at an outside of the wall, and an air outlet (213) arranged at an inside of the wall, so that an air flow is directed into the space during the operation of the vacuum cleaner dependent on the negative pressure. The dust indicator further comprises a sensor (220) arranged to detect dust by transmitting and / or receiving an electromagnetic signal transmitted through the space. The air duct is arranged so that the air flow prevents dust from getting stuck in an area by the path of the electromagnetic signal from the sensor. Sensor is arranged behind a transparent window (232) so that it is shielded from dust and debris within the space. (Fig. 2)
    公开号:SE1000700A1
    申请号:SE1000700
    申请日:2010-06-29
    公开日:2011-12-30
    发明作者:Stefan Jonsson；Fredrik Sjoeberg；Henrik Troberg
    申请人:Electrolux Ab；
    IPC主号:
    专利说明:

    25 30 35 40 2 P-13373EN - 1000700-3 Thus, there is a need for an optical dust indicator for indicating the dust level in a dust container. In particular, it would be advantageous to have an optical dust indicator which consists only of solid parts and which prevents contamination caused by dust particles in areas which overlap its optical path.
    Summary of the invention In view of the above, it is an object of the invention to provide an improved dust indicator for a vacuum cleaner which is suitable to be arranged in e.g. an associated dust container, and which at least alleviates the problems discussed above.
    One or more of these data are obtained by a dust indicator in accordance with the independent requirement.
    According to a first aspect of the invention, there is provided a dust indicator for a vacuum cleaner, the dust indicator being arranged in a wall at least partially delimiting a space of the vacuum cleaner which is under negative pressure relative to the outside of said wall during the operation of the vacuum cleaner.
    Dust indicator comprises an air duct having an air inlet arranged at an outside of said wall, and an air outlet arranged at an inside of the wall. The air duct thereby provides an air flow into the space during operation of the vacuum cleaner depending on the negative pressure. Dust indicator further comprises a sensor arranged to detect dust by transmitting and / or receiving an electromagnetic signal transmitted through space. The air duct is arranged so that the air flow prevents dust from getting stuck in an area of the path of the electromagnetic signal from the sensor. Dust indicator further comprises a transparent window behind which the sensor is arranged, thereby achieving shielding of the sensor from dust and debris within the space.
    Thereby a dust indicator is provided in which the sensor for detecting the dust in a space, which is e.g. a dust container, protected against dust and debris in the dust container by means of a transparent window arranged between the sensor and the dusty interior of the dust container. Furthermore, an air flow is used to prevent dust from getting stuck in the area in front of the sensor. The invention has the advantage that the air flow is created automatically when the dust container is put under negative pressure during the operation of the vacuum cleaner. Since the air duct provides air from the outside of the dust container, the air flow usually does not include dust, in contrast to some air flow within e.g. the dust separation system and the dust container of the vacuum cleaner in operation. Furthermore, the dust indicator does not include any moving parts, which makes it reliable, simple and not cumbersome.
    According to an embodiment of the dust indicator, the air flow is directed towards a clean area of the transparent window, the clean area being arranged in the path of the electromagnetic signal for the sensor. By directing the air flow towards the surface of the transparent window through which the electromagnetic signal from the sensor passes, dust and dirt are prevented from getting stuck on this surface and thereby affect the transmission of the electromagnetic signal. As a result, the functionality of the sensor is improved. 20 25 30 35 3 P-13373EN - 1000700-3 According to one embodiment of the dust indicator, air flow is arranged having an angle of incidence towards the clean area which is selected in the range from 0 to 90 degrees, which is applicable to keep the clean area free from dust and debris.
    According to one embodiment of the dust indicator, the cross-sectional area of the air duct varies along its extent. The shape and size of the cross-sectional area can be varied to suit a particular design or application for the dust indicator. Furthermore, the shape of the air duct can be designed so that a well-defined high-speed air flow is created towards the clean surface.
    According to an embodiment of the dust indicator, the cross-sectional area of the air inlet is larger than the cross-sectional area of the air outlet. The narrow cross-sectional area of the air outlet is advantageous because it reduces the risk of dust entering the air duct from the dust container, which risk is highest when the vacuum cleaner is switched off. This risk arises e.g. during cleaning and emptying of the dust container, and if the vacuum cleaner is overturned, dropped or moved in such a way that dust is pressed against the air outlet.
    According to one embodiment of the dust indicator, the shape of the air duct is selected from one of the following shapes: a rectangular shape, a rounded shape, a funnel shape, which is advantageous.
    According to one embodiment of the dust indicator, an outlet length, L, of the air duct at the air outlet is less than 5 mm.
    According to an embodiment of the dust indicator, the width of the air outlet along the transparent window is greater than the height of the air outlet in a direction normal to the transparent window. The wide and low design of the air outlet provides a large clean area in relation to the cross-sectional area of the air duct, while at the same time keeping the air flow provided via the air duct at a minimal level.
    According to an embodiment of the dust indicator, a width / height ratio for the air outlet is selected in the range 1.1 - 4.0.
    According to an embodiment of the dust indicator, the transparent window is arranged flush with the wall.
    According to an embodiment of the dust indicator, the transparent window is arranged in a recess.
    According to an embodiment of the dust indicator, the air duct and the transparent window are arranged in a cover part arranged to be mounted in said wall.
    Thus, the parts of the dust indicator can be arranged in a stand-alone unit which can be manufactured separately and then mounted in the wall. Furthermore, the cover part can be arranged to include a seat for the sensor. In this case, the entire dust indicator can be a separate part for mounting in a wall of e.g. a dust container.
    According to an embodiment of the dust indicator, the air duct is arranged in a tubular module. 20 25 30 35 40 4 P-13373EN - 1000700-3 According to an embodiment of the dust indicator, it further comprises a sealing element for sealing the sensor to the air duct and the ambient space from which said air duct controls ambient air.
    According to a second aspect of the concept according to the invention, there is provided a vacuum cleaner comprising at least one dust indicator or dust indicator system comprising at least two dust indicators, in which the two dust indicators are arranged to face each other and have a common path for the electromagnetic signal through the space. , the sensors of the dust indicators being arranged to communicate. Thus, the dust indicator can be used in a system having a separate transmitter and detector which work together to detect dust.
    Other objects, features and advantages of the invention will become apparent from the following detailed description, from the appended claims as well as from the drawings.
    In general, all terms used in the claims are to be construed according to their ordinary understanding in the technical field unless explicitly defined otherwise herein. All references to "[element, device, component, body, step, etc.]" shall be construed as referring to at least one example of the element, device, component, body, step, etc., unless expressly stated otherwise. .
    Brief Description of the Drawings The above as well as additional objects, features and advantages of the invention will be better understood from the following illustrative and non-limiting detailed description of preferred embodiments of the invention, taken in conjunction with the accompanying drawings, in which like reference numerals will be used for equal or similar elements through all views, wherein: Figure 1 is a perspective view of a vacuum cleaner comprising a dust container provided with an embodiment of a dust indicator system according to the present invention; Figure 2 is a schematic cross-sectional view of a dust container and a detailed cross-sectional view of a dust indicator according to an exemplary embodiment of the invention; Figures 3a and 3b show a perspective front view and a rear perspective view, respectively, of an embodiment of a cover part according to the present invention; Figures 4a and 4b are schematic cross-sectional views of embodiments of a cover part according to the invention; Figure 5 is a schematic cross-sectional view of an embodiment of a dust indicator according to the invention; Figure 6 is a perspective view of an embodiment of a dust indicator according to the invention; P-13373EN - 1000700-3 Figure 7 is a perspective view of an embodiment of a dust indicator according to the invention; and Figure 8 is a schematic illustration of the angle of incidence of the air flow towards a transparent window.
    Detailed Description of Preferred Embodiments Throughout this specification, the exemplary embodiments of the inventive concept are based on optical detection of dust using optical signals. This is for illustrative purposes only. The concept of the present invention is applicable to the detection of dust using electromagnetic signals of wavelengths other than visible wavelengths, which is considered to fall within the scope of the invention.
    Figure 1 schematically illustrates a vacuum cleaner 100 comprising a dust container 101 for receiving dust collected from a dust-laden air flow.
    The dust container 101 is removably mounted in the vacuum cleaner 100 to enable it to be removed and emptied. The dust container 101 generally comprises a substantially hollow unit in one piece, and here is included an inlet 103 which receives dust, dirt and air from a dirt separation chamber 104, see figure 2. As illustrated in figure 1, the vacuum cleaner 1 further comprises components such as a vacuum cleaner body 110 and a cover 120 to house a power unit, etc.
    However, additional components 110, 120 are thus not critical to the implementation of the present invention and detailed descriptions thereof are therefore excluded.
    It is to be understood that the vacuum cleaner 100 further includes a vacuum source, a suction pipe, a floor nozzle, etc. (not shown) for achieving cleaning ability for the vacuum cleaner of dust and dirt, i.e. parts needed to separate dirt from a dust-laden air flow that usually enters the vacuum cleaner via the floor nozzle. However, since these operating principles of the vacuum cleaner with respect to vacuuming and vacuuming are not critical to the implementation of the invention, a detailed description thereof is omitted.
    Further, and now referring to Figure 2, two dust indicators 200, 200 'are arranged opposite each other in the wall 102 of the dust container 101. One of the dust indicators 200 is arranged to send an optical signal into the dust container 101, while the opposite dust indicator 200 'is arranged to receive the optical signal. This means that an optical path OP of the dust indicators 200, 200 'extends through the space of the dust container 101. As long as dirt collected in the dust container 101 does not reach a critical level blocking the optical path OP, the receiver, the dust indicator 200', will detect a high level optical signal. As the dirt level increases, it will eventually block the optical path OP, and the dust indicator 200 'will detect a low or completely blocked optical signal. Thus, an indication of the level of dirt that has reached a critical value has been reached. The dust indicators 200, 200 'are advantageously connected to a control circuit for handling the indication of the full dust container, or are alternatively connected directly to an optical or acoustic alarm, e.g. an LED light source or an alarm clock, designed to catch the user's attention and remind him to empty the dust container (not shown). 10 15 20 25 30 35 40 45 6 P-13373EN - 1000700-3 In the detailed plan view of an embodiment of a dust indicator 200 in Figure 2, it can be seen that the dust indicator 200 comprises a cover part 210 arranged in the wall 102 of the dust container 101. The cover part 210 is here an elongate plastic mold body 230 comprising a transparent window 232 arranged flush with the wall 102, and an air duct 211 formed in the body 230 and disposed adjacent the transparent window 232. The air duct 211 comprises an air inlet 212 arranged at an outside of the wall 102 of the dust container 101, and an air outlet 213 disposed at an inside of the wall 102 of the dust container 101, thereby providing fluid communication between ambient space and the inside of the dust container 101. The air duct 211 extends from the opening defined in the air inlet 212, via an inlet. passage of a duct portion 231 projecting from the cover portion 210 and into the dust container 101, and to an air outlet 213. Part of the internal passage of the duct portion is arranged parallel to and flush with the inside of the wall 102.
    It should be emphasized that according to an embodiment of a dust indicator, the cover part is an integral part of the wall of the dust container. Furthermore, although the exemplary embodiments are directed to the arrangement of the dust indicator in the wall of the vacuum container of a vacuum cleaner, the present inventive concept is applicable to other spaces of the vacuum cleaner which are put under negative pressure during the operation of the vacuum cleaner.
    During operation of the vacuum cleaner, the vacuum source (not shown) creates a vacuum to draw air and dirt into the vacuum cleaner. This further creates a pressure difference between the dust container and the surrounding space. A negative pressure in the dust container forces ambient air from outside the dust container 101 to flow into the dust container 101 via the air duct 211. When the air outlet 213 (and a final part of the air duct, which will be described below) is arranged next to or in direct proximity to the transparent window 232 the air duct 211 directs air towards the transparent window 232 and thereby affects at least a part of the transparent window, which is defined as a clean area 233, with a jet of air. Thus, the clean area 233 is kept clean from dust particles by the air flow from the air duct 211, which air flow is created during the operation of the vacuum cleaner.
    Referring now to Figure 2, at the transparent window 232 and outside the dust container 101, an optical transmitter 220 is provided which is directed towards the transparent window 232 so that light emitted from the optical transmitter 220 is transmitted through the transparent window 232 and into the dust container 101. The optical transmitter 220 is arranged so that the optical path OP is overlapped by the clean area 233. Dust particles are thereby prevented from contaminating the surface in front of the optical transmitter 220. The optical transmitter may be mounted in an integral part of the cover part so that the dust indicator is a one-piece component (not shown here) which is advantageous when assembling the vacuum cleaner. Alternatively, the one-piece component may be mounted in a portion of the vacuum cleaner housing (not shown).
    During operation of the vacuum cleaner 100, the optical transmitter 220 transmits an optical signal of wavelength k, where X is a predefined wavelength or range of wavelength within the electromagnetic spectrum, e.g. visible light, a specific light color, infrared light (IR), or ultraviolet light (UV). By using a special wavelength for the electromagnetic signal, the dust indicator can be designed to be less sensitive to stray light or other electromagnetic energy that is present in the environment. In addition, a reduced sensitivity to ambient noise and reflections for the dust indicator can be provided by modulating the electromagnetic signal, e.g. by frequency modulation or any other suitable modulation technique.
    For a high efficiency of the transmission of the optical signal into the dust container 101, the material of the transparent window 232 is chosen to have a high light transmission for the predetermined wavelength k.
    The optical signal is transmitted inside the dust container and is received by the second dust indicator 200 'which in principle has the same structure as described for the dust indicator 200 above, but which contains an optical receiver instead of an optical transmitter. As long as the optical path is not blocked by dust, the optical receiver receives a high optical signal. In one embodiment of the dust indicator, a transceiver is used instead of a separate optical transmitter or receiver. This means that the transceiver sends an optical signal into the dust container, via the transparent window, which signal is reflected in e.g. an oppositely reflecting part arranged inside the dust container. The reflected optical signal is detected by the transceiver. When the optical signal is blocked by dust, an indication of the dirt level that has reached a critical level is provided.
    Figure 3a shows a perspective front view of the cover part 210 as seen from inside the dust container 101. The projecting part 231 is formed substantially as a rectangular block with rounded edges. The air outlet 213 here is a rectangular opening having a width of 2 mm and a height of 1.5 mm. Figure 3b shows a perspective view from behind of the cover part 210 seen from the outside of the dust container 101. The air inlet 212 is here a rectangular opening having a width of 4 mm and a height of 2 mm. The cross-sectional area of the air duct 211 thus varies along its extent, and the cross-sectional area of the air inlet 212 is larger than the cross-sectional area of the air outlet 213. This is to prevent dust from getting stuck in the air duct 211 when the vacuum cleaner is turned off. As long as the vacuum cleaner is in operation, the air flow in the air duct 211 prevents dust from the dust container 201 from being deposited inside the air duct 211. However, when the vacuum cleaner is turned off and the vacuum cleaner is overturned, dropped or moved in such a way that dust is pressed against the air outlet 213 that dust can get stuck in the air outlet 213. The small area of the air outlet reduces this risk.
    Referring now to Figures 4a and 4b, to further prevent dust from blocking the air outlet 213, the cross-sectional area of the air duct 211 is arranged to change rapidly from large to small since a short exit length L of the air duct 211 at the air outlet 213 is advantageous. The output length L is advantageously chosen to be less than 5 mm. First, a scenario is considered as illustrated in Figure 4a where the exit length L is long, the cross section of the air inlet 212 is small, compared to the scenario illustrated in Figure 4b where the exit length L is short and the cross section of the air inlet 212 is large. In the first case, it is more likely that the dust gets stuck in the outlet of the air duct 211 than in the latter case. In one embodiment of the dust indicator, the width and height of the air outlet 213 are chosen to be 2 mm resp. 1.5 mm. The dimensional zones for the air outlet are chosen to provide a large size for the clean area 233, thus facilitating that the area in front of the sensor is kept clean. Furthermore, a width / height ratio for the air outlet is advantageously chosen in the range 1.1 - 4.0.
    In the embodiments of the dust indicator as described with reference to Figures 2 and 3, the air outlet 213 is arranged in a plane close to the normal of the transparent window 232. The shape of the air duct in the exemplary embodiment here is substantially rectangular but in alternative embodiments the air duct shape may be more of a rounded shape or a funnel shape.
    According to an embodiment of the dust indicator 500 as illustrated in Figure 5, the dust indicator 500 is arranged with a cover part 210 in the wall 102 of the dust container, similar to that previously described for the dust indicator from Figures 2 and 3. Here the cover part 210 is made by injection molding a plastic material . The cover member 210 is then attached to the dust container wall 102 by ultrasonic welding.
    Other alternatives are to attach the cover member 210 to the wall 102 by an adhesive.
    Furthermore, the sensor, ie. the optical transmitter, optical receiver, or optical transceiver, 220, disposed at the transparent window 232 and outside a portion of the vacuum cleaner body 510. To protect the sensor 220, it is sealed from the air duct 211, and from the ambient space from which the air duct 211 controls ambient air. , by means of a sealing material 515 arranged between the transparent window 232 and the vacuum cleaner body 510, and enclosing the sensor 220. In embodiments of the dust indicator, the air outlet is angled towards the transparent window, as illustrated in embodiments described below with reference to Figures 6 to 8.
    Figure 6 shows a dust indicator 600 having a sensor 220 arranged behind a transparent window 232, and an air duct 211 arranged in a tubular element, having a rigid tube 611 having an air inlet 212 arranged on the outside of the dust container and an air outlet 213 arranged inside the dust container. The tube 611 is bent so that the air outlet 213 is directed towards the transparent window 232 and thereby creates a clean area 233 in front of the sensor 220 when the air flow via the air duct 211 is present. In alternative arrangements, the tube can be flexible and / or adjustable so that the angle of incidence of the air flow can be changed.
    Figure 7 illustrates an embodiment of the dust indicator, in which the dust indicator 700, the transparent window 232 is arranged in a tapered recess 234 in the wall of the dust container or alternatively in a cover part. Furthermore, the air duct 211 is arranged as a through hole in an opposite lower part of the recess, which lower part is substantially perpendicular to the plane of the wall, so that the air flow leaving the air outlet 213 of the air duct 211 is inclined relative to the transparent window 232. The respective air flow in the exemplary embodiments of Figures 6 and 7 are advantageously arranged having an angle of incidence 9 towards the clean area 233 which is selected in the range from 0 to 90 degrees.
    The definition of the angle of incidence 0 is the angle of the incoming air flow "af" relative to the normal plane of the transparent window 232, see Figure 8.
    The invention has mainly been described above with reference to some embodiments. However, it will be readily understood by those skilled in the art that embodiments other than those described above are likewise possible within the scope of the invention as defined by the appended claims.
    权利要求:
    Claims (15)
    [1]
    A vacuum indicator (200) for a vacuum cleaner, the dust indicator being arranged in a wall (102) at least partially delimiting a space of the vacuum cleaner which is under negative pressure relative to the outside of said wall during operation of the vacuum cleaner, said dust indicator comprising: an air duct (211) having an air inlet (212) arranged at an outside of said wall, and an air outlet (213) arranged at an inside of said wall, said air duct thereby providing an air flow into said space during operation of the vacuum cleaner depending on said negative pressure; and a sensor (220) arranged to detect dust by transmitting and / or receiving an electromagnetic signal transmitted through said space, said air duct being arranged so that said air flow prevents dust from getting stuck in an area of the path of the electromagnetic the signal from said sensor; and a transparent window (232) behind which said sensor is arranged, thereby achieving shielding of the sensor from dust and debris within said space.
    [2]
    A dust indicator according to claim 1, wherein said air flow is directed towards a clean area (233) of said transparent window (232), said clean area being arranged in the path of the electromagnetic signal of said sensor (220).
    [3]
    Dust indicator according to claim 2, wherein said air flow is arranged having an angle of incidence towards said clean area (233) which is selected in the range from 0 to 90 degrees.
    [4]
    Dust indicator according to any one of the preceding claims, wherein the cross-sectional area of said air duct (211) varies along its extent.
    [5]
    A dust indicator according to any one of the preceding claims, wherein the cross-sectional area of said air inlet (212) is larger than the cross-sectional area of said air outlet (213). 20 25 1 1 P-13373SE - 1000700-3
    [6]
    Dust indicator according to any one of the preceding claims, wherein the shape of said air duct (211) is selected from one of the following shapes: a rectangular shape, a rounded shape, a funnel shape.
    [7]
    Dust indicator according to any one of the preceding claims, wherein an output length (L) of said air duct (211) at said air outlet (213) is less than 5 mm.
    [8]
    A dust indicator according to any one of the preceding claims, wherein the width of said air outlet (213) along the transparent window (232) is greater than the height of said air outlet in a direction normal to said transparent window.
    [9]
    A dust indicator according to claim 8, wherein a width / height ratio for said air outlet (213) is selected in the range 1.1 - 4.0.
    [10]
    10. transparent window (232) is arranged flush with said wall (102). Dust indicator according to any one of the preceding claims, wherein said
    [11]
    11. transparent windows (232) are arranged in a recess (234). Dust indicator according to any one of the preceding claims, wherein said
    [12]
    Dust indicator according to any one of the preceding claims, wherein said air duct (211) and said transparent window (232) are arranged in a cover part (210) arranged to be mounted in said wall (102).
    [13]
    13. channel is arranged in a tubular element (611). Dust indicator according to any one of the preceding claims, wherein said air
    [14]
    A dust indicator according to any one of the preceding claims, further comprising a sealing element (515) for sealing said sensor (220) against said air duct (211) and the ambient space from which said air duct controls ambient air.
    [15]
    Claims 1 to 14 or at least one dust indicator system comprising at least a vacuum cleaner comprising at least one dust indicator according to any one of two dust indicators (200, 200 ') according to any one of claims 1 to 14, wherein said two dust indicators are arranged to face each other and have a P-13373EN - 1000700-3 common path for said electromagnetic signal through said space, the sensors of said dust indicators being arranged to communicate.
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    同族专利:
    公开号 | 公开日
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    US20130198993A1|2013-08-08|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1000700A|SE534963C2|2010-06-29|2010-06-29|Dust indicator for a vacuum cleaner|SE1000700A| SE534963C2|2010-06-29|2010-06-29|Dust indicator for a vacuum cleaner|
    US13/807,562| US9095244B2|2010-06-29|2011-06-28|Dust indicator for a vacuum cleaner|
    EP20110727703| EP2587978B1|2010-06-29|2011-06-28|Dust indicator for a vacuum cleaner|
    CN201180031961.3A| CN102984981B|2010-06-29|2011-06-28|For the dust indicator of vacuum cleaner|
    PCT/EP2011/060814| WO2012000991A1|2010-06-29|2011-06-28|Dust indicator for a vacuum cleaner|
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