KR20190067516A - Dust sensor and filter having it - Google Patents

Abstract

The present invention relates to a dust sensor and a filter comprising the same. More particularly, the present invention relates to a dust sensing sensor for the filter and the filter equipped with the dust sensor. The filter equipped with the dust sensor according to the present invention comprises the filter having grooves on a surface thereof and the dust sensor inserted into a groove of the filter, wherein the dust sensor has a light-transmitting portion in which dust is accumulated, comprises a housing inserted into the groove of the filter, a light emitting element for irradiating light to the light-transmitting portion, and a light receiving element for receving reflected light incident through the light-transmitting portion that is reflected by dust laminated on the light-transmitting portion, and measures amount of dust laminated to the filter by using amount of reflected light.

Description

DUST SENSOR AND FILTER HAVING IT}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust sensor and a filter including the same, and more particularly, to a dust sensor for a filter and a filter equipped with such a dust sensor.

Conventionally, the structure of a dust sensor is usually composed of a photodiode as a light receiving element, a phototransistor as a light receiving element, and an LED or a laser diode as a light emitting element. Usually, the light receiving element receives the scattered light reflected by the parallel light generated from the light emitting element and measures the concentration of dust in the air.

For example, Korean Utility Model Registration No. 0372496 discloses a light receiving sensor and a light emitting sensor, an optical part composed of a lens for collecting light scattered by dust and a visible light filter, an amplifying part for amplifying an analog output signal of the light receiving part, Photodetector Photodetector Photodetector An optical dust sensor composed of an emitter signal, an emitter signal and an amplified signal to correct and output the sensitivity of the sensor, a sensitivity correction input circuit for correcting the sensitivity dispersion of the sensor, and a microcomputer for processing the signal. to provide.

Korean Patent Laid-Open Publication No. 10-2015-0113575 provides an optical dust sensor capable of self-diagnosis and compensation of dust sensor sensitivity by including a reference signal generator for performing a function of generating a reference signal.

Korean Patent Application No. 10-2016-0068998 discloses a photodiode for generating a photocurrent on one chip in a light receiving element and a one-chip type light receiving element for amplifying the photocurrent by 1000 times or more and outputting a current in a range of 20 to 50 mA at a luminance of 2586K , And does not require re-amplification for measuring the dust concentration.

However, such a dust sensor can measure an atmospheric dust sensor, and it is difficult to measure the amount of dust formed on the surface of the filter.

A problem to be solved by the present invention is to provide a dust filter including a dust sensor capable of measuring the amount of dust accumulated on a surface of a filter.

A problem to be solved by the present invention is to provide a filter dust sensor capable of measuring the amount of dust accumulated on the surface of a filter.

According to an aspect of the present invention, there is provided a dust filter comprising:

A filter having grooves on its surface; And

And a dust sensor inserted in the groove of the filter,

Here, the dust sensor

A housing having a light transmitting portion on which dust is accumulated and inserted into a groove of the filter,

A light emitting element for emitting light to the transparent portion,

And a light receiving element which is reflected by the dust deposited on the transparent portion and receives the reflected light incident through the transparent portion, and measures the amount of dust deposited on the filter by using the amount of reflected light.

Although not theoretically limited, since the dust sensor is located on the surface of the filter, the amount of light reflected from the dust sensor through the light transmitting portion becomes proportional to the amount of dust deposited on the filter, and when the amount of reflected light reaches a predetermined standard, And / or the exchange time.

In the present invention, the filter may be a dust filter having a corrugated surface. For example, it may be a corrugated dust filter having a cross-section of a thread-like concavo-convex structure.

In the present invention, the outer surface of the housing of the dust sensor may have a pair of opposing inclined side surfaces that are narrowed downward so as to be in close contact with the inclined filter grooves.

In the present invention, the dust sensor may have a condenser lens for light emission in an optical path between the light emitting device and the light projecting part so as to condense the emitted light onto the dust on the surface of the transparent part.

In the present invention, the dust sensor may have a light-collecting lens for receiving light in an optical path between the light-transmitting unit and the light-receiving unit so that light incident on the housing through the light- have.

In one aspect,

A housing having a light transmitting portion in which dust is deposited,

A light emitting element which is mounted inside the housing and irradiates light to the dust deposited on the transparent portion at the lower portion of the transparent portion,

And a light receiving element mounted inside the housing and receiving light reflected by the dust deposited on the transparent portion and receiving the light,

Here, the amount of dust deposited on the light transmitting window is measured using the amount of light incident on the light receiving element.

In the present invention, the housing has an outer shape that can be inserted into the groove of the dust filter.

In the embodiment of the present invention, the housing of the dust sensor may include an upper surface on which the light transmitting portion is formed, a lower surface on which the light emitting element and the light receiving element are mounted, and a vacuum cleaner filter having a V- A pair of opposed sloped side surfaces that are narrower in width from the upper surface to the lower surface and a pair of vertical side surfaces that are substantially constant in width and the inside has a predetermined shape space for inserting the lens I have.

In the embodiment of the present invention, the housing of the dust sensor is formed with an opening in an upper surface on which a light transmitting portion is formed, a lower surface on which a light emitting element and a light receiving element are mounted, and is vertically communicated through an inner space, And a printed circuit board on which a light emitting element and a light receiving element are mounted is inserted and sealed in a lower opening.

In a preferred embodiment of the present invention, the inner space is located at an intermediate height, for example, 30 to 70% of the total height, with the lens being divided into an upper compartment and a lower compartment, And the lower ends of the barrier ribs are in close contact with the surface of the printed circuit board and the light emitting elements and the light receiving elements mounted on the printed circuit board are disposed in the respective compartments, .

In the present invention, the lens may be a plate-shaped lens member having a light-emitting lens and a light-receiving lens formed on a rectangular plate. The plate-shaped lens member has a luminous lens for a light-emitting element formed on one side of the plate, a light-receiving lens for a light-receiving element in the middle, and a plate-like support on the other side. The light emitting lens and the light receiving lens are located on the upper part of the second partition, the space between the light emitting lens and the light receiving lens is supported on the upper part of the compartment, A support is supported on the step between the upper compartment and the lower compartment. Preferably, a hole is formed in the plate-like support portion and can be screwed to the step.

In the present invention, the dust deposited on the transparent plate of the dust sensor causes irregular reflection of light to lower the amount of light reaching the light receiving sensor, so that the condensed light is condensed again so as to increase the amount of light condensed on the light receiving element Multistage condensation is preferred.

In the practice of the present invention, two light receiving lenses can be disposed in the optical path for the multi-stage condensing, and preferably two light receiving lenses can be disposed in a narrow area of the sensor. The first light receiving lens and the second light receiving lens may be respectively formed.

In a preferred embodiment of the present invention, the first light receiving lens and the second light receiving lens center axis formed on the upper surface and the lower surface of the light receiving lens may be inclined on the plate so as to increase the light condensing property. More preferably, the first light receiving lens and the second light receiving lens are spherical convex lenses.

According to the present invention, there is provided a new type of dust sensor mounted on the surface of a filter to directly contact dust and measure the amount of dust. Through this, it is possible to inform the replacement timing of the filter, the degree of contamination, and the like.

Further, according to the present invention, there is provided a new filter which is equipped with a dust sensor and can electronically confirm the accumulated amount of dust in the filter.

1 is a view for explaining a state where a dust sensor according to an embodiment of the present invention is mounted on a filter.
2 is an exploded perspective view of a dust sensor according to an embodiment of the present invention.
3 is a side cross-sectional view showing a cross section of a dust sensor according to one embodiment of the present invention.
4 is a view of a lens installed in a dust sensor according to an embodiment of the present invention. FIG. 4A is a sectional view, FIG. 4B is a plan view, and FIG.
5 is a simulation result showing that the amount of received light changes according to the amount of dust in the dust sensor according to one embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to examples.

As shown in FIG. 1, the dust sensor 100 according to the present invention is fixedly inserted into the filter groove 11 of the filter 10 having a corrugated surface.

2 to 4, the dust sensor 100 according to the present invention has a housing 110 to be inserted into the filter groove 11 of the filter 10.

The housing 110 is made of an opaque member such as a black plastic resin or an epoxy resin and has a top surface 111 and a bottom surface 112 as a whole and a pair of opposed side surfaces as a V- (113) having a narrower width from the upper surface to the lower surface so as to be in close contact with the filter groove (11) having a cross section, and the other pair of opposite surfaces are formed to have a substantially constant width And has an inverted trapezoidal outline as a whole.

The stopper 115 protrudes from both sides of the inclined side surface 113 to prevent the dust sensor 100 from being inserted into the filter groove 11 excessively. In addition, a connector opening 118 is formed at the lower end of the vertical side surface 114 so as to connect the dust sensor to the outside.

A space 120 is formed in the housing 110 to extend from the upper opening 116 of the upper surface 111 to the lower opening 117 of the lower surface 112. The inner space 120 is divided into an upper compartment 121 formed at an upper portion of the lens and a lower compartment 122 formed at a lower portion of the lens. The lower compartment includes a vertical partition 123 extending vertically from a lower surface to a lens The width of the lower compartment 122 is narrower than the width of the upper compartment 121 and the width of the lower compartment 122 is narrower than the width of the upper compartment 121. As a result, A step 124 is formed.

The transparent plate 130 is attached to the upper opening 116 to be sealed and the printed circuit board 140 is attached to the lower opening 117 to be sealed. The upper surface of the printed circuit board 140 is in close contact with the lower end of the vertical partition 123 and the light emitting device 141 is mounted on the surface of the printed circuit board 140 constituting the lower surface of the first compartment 122 ' A light receiving element 142 and a connector 143 for exchanging electrical signals with the outside are mounted on the surface of the printed circuit board 140 constituting the lower surface of the second compartment 122 ".

The printed circuit board 140 further includes control ICs, bonding wires, amplifying amplifiers, voltage terminals, and grounding terminals (not shown) in addition to the light emitting device 141 and the light receiving device 142, Lt; / RTI >

The plate member type lens member 150 is supported by the step 124 and the vertical partition 123 in the compartment 120 to separate the upper compartment 121 and the lower compartment 122 from each other. A light emitting lens 151 is positioned at a position corresponding to the upper part of the first compartment 122 'and is emitted from the light emitting element 141 to condense light passing through the first compartment 122' And then sent to the transparent plate 130. A light receiving lens 152 is located at a position corresponding to the upper portion of the second compartment 122 and condenses light that has been reflected by the dust accumulated in the transparent plate 130 and has entered the upper compartment 121, Is condensed to the light receiving element 142 through the light receiving element 122 ".

The luminous lens 151 of the plate-shaped lens member 150 is a spherical lens protruding downward and convexly and the center axis of the lens being perpendicular to the support plate 153. The light-receiving lens 152 protrudes upward and convex, The first light receiving lens 152 ', which is a spherical or aspherical lens, has a central axis of the lens inclined with respect to the support plate 153. The first light receiving lens 152' is a spherical or aspherical lens that is convexly protruded downward and whose center axis is inclined to the support plate 153 And a multi-stage lens composed of a second light receiving lens 152 '', so that multi-stage condensing is performed to condense the light condensed by the first light receiving lens 152 '.

As shown in FIG. 5, a simulation was performed to calculate an optical path on the assumption that dust was accumulated on the surface after the dust sensor 100 was mounted on the filter groove 11 of the filter. After setting the intensity of the light source to 1 W, three-dimensional spherical particles having a diameter of 1 탆 were arranged at intervals of 0.1 mm, and the simulation was performed to confirm that dust was accumulated to a small extent. Secondly, To 0.03 mm, and simulates a case where a lot of dust is accumulated. As shown in Fig. 5, it can be seen that the quantity of dust is increased, and the amount of light incident on the light receiving element is increased.

10: Filter
100: Dust sensor
110: Housing
120: compartment
130: Transparent plate
140: printed circuit board
150: plate member type lens member

Claims (10)

A filter having grooves on its surface; And
And a dust sensor inserted in the groove of the filter,
Here, the dust sensor
A housing having a light transmitting portion on which dust is accumulated and inserted into a groove of the filter,
A light emitting element for emitting light to the transparent portion,
And a light receiving element which is reflected by the dust deposited on the transparent portion and receives the reflected light incident through the transparent portion, and measures the amount of dust deposited on the filter by using the amount of reflected light. The dust filter according to claim 1, wherein the filter has a corrugated surface. The dust sensor according to claim 1 or 2, wherein the dust sensor converts the amount of reflected light into an electrical signal, and determines the time of replacement and / or cleaning when the amount of reflected light exceeds a predetermined standard filter. 3. The dust filter according to claim 1 or 2, wherein the dust sensor has a housing having a pair of opposing inclined side faces that become narrower downward so as to be in close contact with the inclined filter groove. The dust sensor according to claim 4, wherein the dust sensor comprises: a condensing lens for light emission in an optical path between the light emitting element and the light projecting part so as to condense the emitted light onto dust on the surface of the light projecting part; And a light collecting lens for light reception is provided in an optical path between the light transmitting portion and the light receiving element so that the light incident into the inside can be converged by the light receiving element. A housing having a light transmitting portion in which dust is deposited,
A light emitting element which is mounted inside the housing and irradiates light to the dust deposited on the transparent portion at the lower portion of the transparent portion,
And a light receiving element mounted inside the housing and receiving light reflected by the dust deposited on the transparent portion and receiving the light,
Wherein the amount of dust deposited on the light transmitting window is measured using the amount of light incident on the light receiving element. The dust sensor according to claim 6, wherein the dust sensor has a light collecting lens located in an optical path between the light emitting element and the light projecting part, and a light collecting lens for light receiving between the light projecting part and the light receiving element, Dust sensor. 8. The dust sensor according to claim 7, wherein the light-collecting lens for light-receiving is a multi-stage light-converging lens. The multi-stage light-converging lens according to claim 8, wherein the multi-stage light-converging type lens is a plate-shaped lens member having a first light receiving lens for primary light condensing formed on an upper portion of a plate member and a second light receiving lens for secondary light condensing on a lower portion of the plate Dust sensor features. The dust sensor according to claim 9, wherein the plate-shaped lens member has a first light receiving lens and a second light receiving lens center axis formed on an upper surface and a lower surface thereof inclined to the plate material.

Images