KR20190057636A - Dust measuring device - Google Patents

Abstract

The present invention relates to a dust measuring device in order to minimize the occurrence of noise which may occur in dust measurement. The dust measuring device comprises: a dust sensor; a fan for forming a flow rate at which air in a measurement object space flows from an inlet hole to an outlet hole of the dust sensor; a vent bracket formed in an area corresponding to the inlet hole of the dust sensor to form a vent hole for controlling the flow rate of the air flowing into the inlet hole of the dust sensor; and a collision plate provided at a point inside the vent hole to cover a central area of the vent hole.

Description

[0001] DUST MEASURING DEVICE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust measuring apparatus provided with a dust sensor for performing dust measurement on a specific space.

A dust sensor is used to measure the amount of dust in a particular air. For an accurate measurement of the amount of dust, the air to be measured must be passed through the dust sensor.

Accordingly, the dust measuring apparatus provided with the dust sensor includes a structure for introducing or discharging the outside air into the dust sensor.

Two important components of the air intake / exhaust structure of the dust measurement device are the configuration for introducing outside air and the configuration for forming a flow path for the incoming air to reach or exit the dust sensor.

At this time, in order to clearly measure the dust state of the outside air, a device for introducing outside air at a constant flow rate and a flow rate is required, and it is necessary to minimize the inflow of unintentional air or the like.

For example, if the target substance to be measured is a micro-tenant, it is ideal to introduce only the micro-tenant into the dust sensor. Nevertheless, there is a fear that dust larger than the micro-tenant in the air is introduced together to cause noise in the measurement of the micro-tenant.

Further, in the case where the dust sensor is of the optical type, sensing noise may be generated due to light that is input from the outside.

Therefore, a dust measuring device capable of solving these two problems is required.

Also, depending on the degree of sealing or sealing of the dust measuring device, it may affect the flow rate or flow rate of the air, which may cause a difference or noise in the dust concentration measurement value.

In addition, if the dust measuring device is complicated and bulky, it is necessary to simplify the structure because it may cause an increase in cost because sealing is required at various points.

The present invention aims at minimizing the occurrence of noise that may occur in dust measurement, which is the above-mentioned problem.

According to an aspect of the present invention, there is provided an air conditioner comprising: a dust sensor; a fan for forming a flow rate at which air flows in the measurement space from an inlet hole to an outlet hole of the dust sensor; A vent hole formed in an area where the vent hole is formed to form a vent hole for regulating a flow rate of air flowing into the inlet hole of the dust sensor, and a dust plate provided at a point inside the vent hole, A measuring device is provided.

According to another aspect of the present invention, the vent bracket further includes a diffuser portion formed at an inlet of the vent hole to form a narrower cross-sectional area than the vent hole, and a nozzle portion formed at an outlet of the vent hole to form a cross- A measuring device is provided.

According to another aspect of the present invention, there is provided a dust measurement apparatus, wherein the cross section of the vent hole, the inner circumferential section of the diffuser section, the inner circumferential section of the nozzle section, and the impingement plate are circular.

According to another aspect of the present invention, there is provided a dust measuring apparatus, wherein the cross section of the vent hole, the inner circumferential surface of the diffuser, the inner circumferential surface of the nozzle, and the impeller are coaxial.

According to another aspect of the present invention, there is provided a dust measuring apparatus, comprising: a diffuser having a diameter in a cross-section of 4 mm, a diameter in a cross-section of the nozzle unit of 1.0 mm or more and 1.5 mm or less, Lt; / RTI >

According to another aspect of the present invention, the vent bracket includes an inner member including the nozzle portion and engaged with the inlet hole of the dust sensor, and an outer member including the diffuser portion and coupled to the outer side of the inner member Thereby providing a dust measuring device.

According to another aspect of the present invention, there is provided a dust measurement apparatus including a support frame supported and fixed to the vent bracket, and a connection bridge connecting the support frame and the impact plate.

According to another aspect of the present invention, the inner member includes a stepped portion having an inner peripheral surface larger than the diameter of the vent hole, the outer member and the support frame are seated and fixed to the stepped portion, and the diameter of the vent hole is And is kept constant.

According to another aspect of the present invention, there is provided a dust measuring apparatus, wherein the inner surface of the nozzle unit includes an inclined surface whose sectional area is gradually narrowed toward the direction of the dust sensor.

The effect of the dust measuring apparatus according to the present invention will be described as follows.

According to at least one of the embodiments of the present invention, there is an advantage that the probability that dust particles other than the ultra-fine particles enter the dust sensor can be minimized.

In addition, according to at least one embodiment of the present invention, there is an advantage that the probability of occurrence of noise, which may occur in the sensing of the dust sensor by light, can be reduced.

In addition, according to at least one of the embodiments of the present invention, there is an advantage that a dust measuring device that reduces the probability of occurrence of noise can be easily manufactured.

Further scope of applicability of the present invention will become apparent from the following detailed description. It should be understood, however, that the detailed description and specific examples, such as the preferred embodiment of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art. .

1 is a block diagram for explaining a dust measuring apparatus according to the present invention.
2 (a) and 2 (b) are conceptual diagrams of the air flow of the dust measurement device of the present invention according to the first embodiment.
3 is a conceptual diagram of the air flow of the dust measurement apparatus of the present invention related to Embodiment 2-1.
4 is a conceptual diagram of the air flow of the dust measurement apparatus of the present invention related to Embodiment 2-2.
5 is a conceptual diagram of the air flow of the dust measurement apparatus of the present invention related to Embodiment 2-3.
6 is a conceptual diagram showing an air flow of the dust measurement apparatus of the present invention in connection with the embodiment 2-4.
FIG. 7 shows a specific embodiment of the dust measurement apparatus of the first embodiment.
Fig. 8 shows a specific embodiment of the dust measurement apparatus of the first embodiment.
9 shows an embodiment of a dust sensor according to the present invention.
10 is a cross-sectional view taken along line AA 'in FIG.
11 is a perspective view of the combined state of the vent bracket and the dust sensor of the dust measuring apparatus according to the present invention.
12 is a partial perspective view of the vent meter of the dust measuring apparatus according to the present invention before the connection of the dust sensor 210 and the vent bracket.
13 is a schematic cross-sectional view in the direction of BB 'of Fig.
FIG. 14 is a graph showing measured values of the dust collection efficiency according to the particle size of the dust sensor according to the present invention. FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals are used to designate identical or similar elements, and redundant description thereof will be omitted. The suffix " module " and " part " for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role. In the following description of the embodiments of the present invention, a detailed description of related arts will be omitted when it is determined that the gist of the embodiments disclosed herein may be blurred. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. , ≪ / RTI > equivalents, and alternatives.

The dust measuring apparatus described in this specification collectively refers to any apparatus having a dust sensor. Accordingly, the present invention can include not only a device having a dust sensor and performing only dust sensing, but also any device that performs a combination of other functions.

1 is a block diagram for explaining a dust measurement apparatus 100 related to the present invention.

The dust measuring apparatus 100 includes a wireless communication unit 110, an input unit 120, a sensing unit 130, an output unit 140, an interface unit 150, a memory 160, a control unit 170, 180), and the like.

The components shown in FIG. 1 are not essential for implementing the dust measurement apparatus 100, and thus the dust measurement apparatus 100 described in this specification may include more or fewer components than the components listed above Lt; / RTI >

More specifically, the wireless communication unit 110 among the above-described components may be connected between the dust measurement apparatus 100 and the wireless communication system, between the dust measurement apparatus 100 and another external terminal, or between the dust measurement apparatus 100 and the external server Lt; RTI ID = 0.0 > wireless < / RTI > In addition, the wireless communication unit 110 may include one or more modules for connecting the dust measurement apparatus 100 to one or more networks.

The wireless communication unit 110 may include at least one of a wireless Internet module 111, a short distance communication module 112, and a location information module 113.

The short-range communication module 112 is for short-range communication. The short-range communication module 112 includes Bluetooth ™, Radio Frequency Identification (RFID), Infrared Data Association (IrDA), Ultra Wideband (UWB) (Near Field Communication), Wi-Fi (Wireless-Fidelity), Wi-Fi Direct, and Wireless USB (Wireless Universal Serial Bus) technology. The short-range communication module 112 is connected to the dust-measuring device 100 and the wireless communication system via the wireless area networks, between the dust-measuring device 100 and another dust-measuring device 100, And can support wireless communication between the measurement apparatus 100 and the network where the other dust measurement apparatus 100 (or the external server) is located. The short-range wireless communication network may be a short-range wireless personal area network.

Here, the other external terminal may be a mobile terminal or a wearable device capable of exchanging data with the dust measurement apparatus 100 according to the present invention or a wearable device (e.g., smartwatch, smart Glass (smart glass), head mounted display (HMD)). The near field communication module 112 can sense (or recognize) a mobile terminal or a wearable device capable of communicating with the dust measurement device 100 around the dust measurement device 100. Further, when the detected mobile terminal or the wearable device is a device authenticated to communicate with the dust measurement apparatus 100 according to the present invention, the control unit 170 controls at least a part of the data processed in the dust measurement apparatus 100, To the mobile terminal or the wearable device through the short-range communication module 112. Therefore, the user of the mobile terminal or the wearable device can use the data processed by the dust measurement device 100 through the mobile terminal or the wearable device. Or the dust measuring apparatus 100 may receive the processed data through the mobile terminal or the wearable device and perform specific operations.

For example, data on the skin condition measured by the dust measuring apparatus 100 is transmitted to a mobile terminal or a wearable device, and the data is used as a database to detect the tendency of the skin condition change, Can be controlled.

Particularly, the dust measuring apparatus 100 according to the present invention may be applied to a dust measuring apparatus 100 such as a Bluetooth ™, a Radio Frequency Identification (RFID), an Infrared Data Association (IrDA), a UWB (UltraWideband), a ZigBee, And a universal serial communication technology such as a USB (Wireless Universal Serial Bus) may be applied.

Among them, the NFC module provided in the dust measuring apparatus 100 supports non-contact type short-range wireless communication at a distance of about 10 cm. The NFC module may operate in either a card mode, a reader mode, or a P2P mode. In order for the NFC module to operate in the card mode, the dust measuring apparatus 100 may further include a security module for storing card information. Here, the security module may be a physical medium such as a UICC (e.g., a SIM (Subscriber Identification Module) or a USIM (Universal SIM)), a Secure micro SD and a sticker, a logical medium embedded in the dust measurement device (E.g., embeded SE (Secure Element)). Data exchange based on SWP (Single Wire Protocol) can be made between NFC module and security module.

When the NFC module is operated in the card mode, the dust measuring apparatus 100 can transmit the stored card information to the outside such as a conventional IC card.

When the NFC module is operated in the reader mode, the dust measuring device can read data from an external tag. At this time, the data received from the tag by the dust measuring device can be coded into a data exchange format (NFC Data Exchange Format) defined by the NFC Forum. In addition, the NFC Forum defines four record types. Specifically, the NFC forum defines four RTDs (Record Type Definitions) such as Smart Poster, Text, Uniform Resource Identifier (URI), and General Control.

When the NFC module is operated in a peer-to-peer (P2P) mode, the dust measuring apparatus 100 can perform P2P communication with another apparatus. At this time, LLCP (Logical Link Control Protocol) may be applied to P2P communication. A connection may be created between the dust measurement apparatus 100 and another external terminal for P2P communication. At this time, the generated connection can be divided into a connectionless mode in which one packet is exchanged and terminated, and a connection-oriented mode in which packets are exchanged consecutively. Through P2P communication, data and Bluetooth, setup parameters for Wi-Fi connection, etc. can be exchanged. However, since the usable distance of NFC communication is short, the P2P mode can be effectively used to exchange small-sized data.

The position information module 113 is a module for obtaining the position (or the current position) of the dust measurement apparatus 100, and representative examples thereof include a Global Positioning System (GPS) module or a Wireless Fidelity (WiFi) module. For example, when the dust measuring apparatus 100 utilizes the GPS module, the position of the dust measuring apparatus 100 can be obtained using a signal transmitted from the GPS satellite. As another example, the dust measurement device 100 may utilize the Wi-Fi module to detect the dust measurement device 100 based on information of a wireless access point (AP) that transmits or receives a wireless signal with the Wi-Fi module. Can be obtained. Optionally, the location information module 115 may substitute or additionally perform any of the other modules of the wireless communication unit 110 to obtain data regarding the location of the dust measurement apparatus 100. The position information module 115 is a module used to acquire the position (or the current position) of the dust measurement apparatus 100 and is not limited to a module that directly calculates or acquires the position of the dust measurement apparatus 100 .

The input unit 120 includes a camera 121 or an image input unit for inputting a video signal, a user input unit 122 (e.g., a touch key, a mechanical key, and the like) . ≪ / RTI > The image data collected by the input unit 120 may be analyzed and processed by a user's control command.

The camera 121 processes image frames such as still images or moving images obtained by the image sensor in the video communication mode or the photographing mode. The processed image frame can be displayed on the display unit 141 or stored in the memory 160. [

The camera 121 includes at least one of a camera sensor (e.g., CCD, CMOS, etc.), a photo sensor (or an image sensor), and a laser sensor.

The camera 121 and the laser sensor may be combined with each other to sense a touch of the sensing object with respect to the three-dimensional stereoscopic image. The photosensor can be laminated to the display element, which is adapted to scan the movement of the object to be detected proximate to the touch screen. More specifically, the photosensor mounts photo diodes and TRs (Transistors) in a row / column and scans the contents loaded on the photosensor using an electrical signal that varies according to the amount of light applied to the photo diode. That is, the photo sensor performs coordinate calculation of the object to be sensed according to the amount of change of light, and position information of the object to be sensed can be obtained through the calculation.

The camera 121 provided in the dust measuring apparatus 100 can perform a function of photographing the surface state of the attached skin. When the display unit 141 is provided, it is possible to display the photographed skin surface state so that the user can confirm the photographed skin surface state.

The user input unit 122 is used to receive information from a user. When information is input through the user input unit 122, the controller 170 controls the operation of the dust measurement apparatus 100 to correspond to the input information have. The user input unit 122 may include a mechanical input unit (or a mechanical key, for example, a button located on the front, rear, or side of the dust measurement apparatus 100, a dome switch, , Jog switches, etc.) and touch-type input means. For example, the touch-type input means may comprise a virtual key, a soft key or a visual key displayed on the touch screen through software processing, And a touch key disposed on the touch panel. Meanwhile, the virtual key or the visual key can be displayed on a touch screen having various forms, for example, a graphic, a text, an icon, a video, As shown in FIG.

The sensing unit 130 may include at least one sensor for sensing at least one of information in the dust measuring apparatus 100, surrounding environment information surrounding the dust measuring apparatus 100, and user information. For example, the sensing unit 130 may include a proximity sensor 131, an illumination sensor 132, a touch sensor, an acceleration sensor, a magnetic sensor, A G-sensor, a gyroscope sensor, a motion sensor 133, an RGB sensor, an infrared sensor, a finger scan sensor, an ultrasonic sensor a sensor, an optical sensor (e.g., camera 121), a microphone, a battery gauge, an environmental sensor (e.g., a barometer, a hygrometer, a thermometer, A sensor, a gas sensing sensor, etc.), a chemical sensor (e.g., an electronic nose, a healthcare sensor, a biometric sensor, etc.). Meanwhile, the dust measurement apparatus 100 disclosed in the present specification can combine and use information sensed by at least two sensors among the sensors.

The sensing unit 130 senses at least one of information in the dust measuring apparatus 100, surrounding environment information surrounding the dust measuring apparatus 100, and user information, and generates a corresponding sensing signal. The control unit 170 may control driving or operation of the dust measuring apparatus 100 or perform data processing, function, or operation related to the application program installed in the dust measuring apparatus 100 based on the sensing signal.

The proximity sensor 131 is a sensor that detects the presence of an object approaching a predetermined detection surface or an object existing in the vicinity of the detection surface without mechanical contact by using electromagnetic force or infrared rays. The proximity sensor 131 may be disposed in the interior of the dust measurement device 100 or proximity sensor 131 near the touch screen.

Examples of the proximity sensor 131 include a transmission type photoelectric sensor, a direct reflection type photoelectric sensor, a mirror reflection type photoelectric sensor, a high frequency oscillation type proximity sensor, a capacitive proximity sensor, a magnetic proximity sensor, and an infrared proximity sensor. In the case where the touch screen is electrostatic, the proximity sensor 131 can be configured to detect the proximity of the object with a change of the electric field along the proximity of the object having conductivity. In this case, the touch screen (or touch sensor) itself may be classified as a proximity sensor.

On the other hand, for convenience of explanation, the act of recognizing that the object is located on the touch screen in proximity with no object touching the touch screen is referred to as " proximity touch & The act of actually touching an object on the screen is called a " contact touch. &Quot; The position at which the object is closely touched on the touch screen means a position where the object corresponds to the touch screen vertically when the object is touched. The proximity sensor 131 can detect a proximity touch and a proximity touch pattern (for example, a proximity touch distance, a proximity touch direction, a proximity touch speed, a proximity touch time, a proximity touch position, have. Meanwhile, the control unit 170 processes data (or information) corresponding to the proximity touch operation and the proximity touch pattern sensed through the proximity sensor 131 as described above, and further provides visual information corresponding to the processed data It can be output on the touch screen. Further, the control unit 170 can control the dust measuring apparatus 100 so that different operations or data (or information) are processed depending on whether the touch to the same point on the touch screen is a proximity touch or a touch contact have.

The touch sensor may use a touch (or touch input) applied to the touch screen (or the display unit 141) by using at least one of various touch methods such as a resistance film type, a capacitive type, an infrared type, an ultrasonic type, Detection.

For example, the touch sensor may be configured to convert a change in a pressure applied to a specific portion of the touch screen or a capacitance generated in a specific portion to an electrical input signal. The touch sensor may be configured to detect a position, an area, a pressure at the time of touch, a capacitance at the time of touch, and the like where a touch object touching the touch screen is touched on the touch sensor. Here, the touch object may be a finger, a touch pen, a stylus pen, a pointer, or the like as an object to which a touch is applied to the touch sensor.

The control unit 170 may perform different controls or perform the same control according to the type of the touch object, which touches the touch screen (or a touch key provided on the touch screen). Whether to perform different controls or to perform the same control according to the type of the touch object can be determined according to the operating state of the current dust measuring apparatus 100 or an application program being executed.

On the other hand, the touch sensors and the proximity sensors discussed above can be used independently or in combination to provide a short touch (touch), a long touch, a multi touch, a drag touch ), Flick touch, pinch-in touch, pinch-out touch, swipe touch, hovering touch, and the like. Touch can be sensed.

The ultrasonic sensor can recognize the position information of the object to be sensed by using ultrasonic waves. Meanwhile, the controller 170 can calculate the position of the wave generating source through the information sensed by the optical sensor and the plurality of ultrasonic sensors. The position of the wave source can be calculated using the fact that the light is much faster than the ultrasonic wave, that is, the time when the light reaches the optical sensor is much faster than the time the ultrasonic wave reaches the ultrasonic sensor. More specifically, the position of the wave generating source can be calculated using the time difference with the time when the ultrasonic wave reaches the reference signal.

Thus, when there is a touch input to the touch sensor, the corresponding signal (s) is sent to the touch controller. The touch controller processes the signal (s) and transmits the corresponding data to the controller 170. Thus, the control unit 170 can know which area of the display unit 141 is touched or the like. Here, the touch controller may be a separate component from the controller 170, and may be the controller 170 itself.

The output unit 140 includes at least one of a display unit 141, an acoustic output unit 142, a haptic module 143, and a light output unit 144 to generate an output related to visual, auditory, can do. The display unit 141 may have a mutual layer structure with the touch sensor or may be integrally formed to realize a touch screen. Such a touch screen may function as a user input portion 122 that provides an input interface between the dust measurement device 100 and a user and may provide an output interface between the dust measurement device 100 and a user.

The display unit 141 displays (outputs) information to be processed by the dust measuring apparatus 100. For example, the display unit 141 may display execution screen information of an application program driven by the dust measuring apparatus 100, or UI (User Interface) and GUI (Graphic User Interface) information according to the execution screen information have.

The interface unit 150 serves as a path for connection to various kinds of external devices connected to the dust measurement device 100. The interface unit 150 is connected to a device having a wired / wireless headset port, an external charger port, a wired / wireless data port, a memory card port, And may include at least one of ports. In the dust measuring apparatus 100, corresponding to the connection of the external device to the interface unit 150, it is possible to perform appropriate control relating to the connected external device.

The memory 160 stores data supporting various functions of the dust measurement apparatus 100. [ The memory 160 may store a plurality of application programs (application programs or applications) driven by the dust measurement apparatus 100, data for operation of the dust measurement apparatus 100, and commands. At least some of these applications may be downloaded from an external server via wireless communication. Also, at least some of these application programs may exist on the dust measuring apparatus 100 from the time of departure for the basic function of the dust measuring apparatus 100. The application program may be stored in the memory 160 and may be installed on the dust measuring apparatus 100 and may be driven by the control unit 170 to perform the operation (or function) of the dust measuring apparatus 100 have.

In addition to the operations associated with the application program, the control unit 170 typically controls the overall operation of the dust measurement apparatus 100. [ The control unit 170 may process or process signals, data, information, and the like input or output through the components described above or may drive an application program stored in the memory 160 to provide or process appropriate information or functions to the user.

The control unit 170 may control at least some of the components illustrated in FIG. 1 to drive an application program stored in the memory 160. FIG. In addition, the controller 170 may operate at least two of the components included in the dust measuring apparatus 100 in combination with each other for driving the application program.

Under the control of the controller 170, the power supply unit 180 receives power from the external power source and supplies power to the components included in the dust measurement apparatus 100. The power supply unit 180 includes a battery, which may be an internal battery or a replaceable battery.

At least some of the components may operate in cooperation with each other to implement the operation, control, or control method of the dust measurement apparatus 100. In addition, the operation, control, or control method of the dust measuring apparatus may be implemented on the dust measuring apparatus by driving at least one application program stored in the memory 160.

Embodiment 1 relates to a dust measuring apparatus for measuring dust in a specific space, and Embodiment 2 relates to a dust measuring apparatus for measuring dust in at least two spaces.

- Example 1 -

2 (a) and 2 (b) are conceptual diagrams of the air flow of the dust measurement device 200 of the present invention according to the first embodiment.

The dust sensor 210 may be mounted on the main body housing 220 of the dust measurement device. The main body housing 220 may mount at least the dust sensor 210 and may form at least a part of the entire flow path of the dust measuring apparatus 200.

The main body housing 220 is provided with a first outer hole 221a and a second outer hole 221b. The first outer hole 221a and the second outer hole 221b are formed at two points of the main body housing 220 respectively and the first outer hole 221a is formed in the first inner hole 211a of the dust sensor 210 And the second outer hole 221b may be connected to the second inner hole 211b of the dust sensor 210. [

Either the first outer hole 221a or the second outer hole 221b may be provided so as to be adjacent to the measurement target space. 2 (a) and 2 (b) assume that the first outer holes 211a are provided so as to be relatively adjacent to the measurement target space.

The fan 240 may be provided on the first outer hole 221a or on the second outer hole 221b with respect to the dust sensor 210. [

The fan 240 must be installed and driven to form a flow rate from the space to be measured to the dust sensor 210. 2 (a), when the fan 240 is positioned between the space to be measured and the dust sensor 210, a pressure to push the dust sensor 210 toward the dust sensor 210 is formed. As shown in FIG. 2 (b) 240 may be positioned between the opposite side of the object to be measured and the dust sensor 210 to form a pressure to be pulled from the dust sensor 210.

In the arrangement of the fan 240 as shown in FIG. 2 (a), even if there is a gap between the fan 240 and the dust sensor 210 which is exposed to the external space, unexpected air in the external space is discharged to the dust sensor It is advantageous in terms of sealing since it is less likely to be introduced.

In the arrangement of the fan 240 as shown in FIG. 2 (b), since the fan 240 is not provided between the measurement object space and the dust sensor 210, no measurement noise due to the foreign substance or the like provided in the fan 240 is generated There are advantages.

- Example 2-1 -

A dust measuring device 200 that shares the same flow path for measuring the air condition of the two spaces but has a fan independently to form a flow rate in a pushing direction to the dust sensor can be provided.

3 is a conceptual diagram of the air flow of the dust measurement apparatus 200 of the present invention related to Embodiment 2-1.

The dust sensor 210 may be mounted on the body housing 220 of the dust measurement apparatus 200. The main body housing 220 may mount at least the dust sensor 210 and may form at least a part of the entire flow path of the dust measuring apparatus 200.

The main body housing 220 is provided with a first outer hole 221a and a second outer hole 221b. The first outer hole 221a and the second outer hole 221b are formed at two points of the main body housing 220 respectively and the first outer hole 221a is formed in the first inner hole 211a of the dust sensor 210 And the second outer hole 221b may be connected to the second inner hole 211b of the dust sensor 210. [

The first outer hole 221a is connected to the first outer space and the second outer hole 221b is connected to the outer second space. At this time, the outer first space and the outer second space may be partitioned.

The first fan 240a is provided at a position corresponding to the first outer hole 221a and the second fan 240b is provided at a position corresponding to the second outer hole 221b. The first fan 240a is provided to form an air flow rate from the first outer hole 221a to the dust sensor 210 while the second fan 240b is provided to the second outer hole 221b To the dust sensor 210 to form an air flow rate.

That is, the first fan 240a is provided between the first space and the dust sensor 210 to form a pressure difference so that the air in the first space flows to the dust sensor 210, and the second fan 240b forms a pressure difference A pressure difference may be formed between the space and the dust sensor 210 so that the air in the second space flows to the dust sensor 210. That is, each of the fans 240 can pull out the outside air to the position of the fan, and can exert the force in the direction of pushing the pulled out air back to the dust sensor.

The arrangement of the fan 240 generating a force in the form of pushing the air to the dust sensor 210 is advantageous in the sealing structure.

In the above-described fan arrangement structure, only the sealing from the outer space to the point where air is drawn from the fan 240 to the air is sufficient.

For example, when air flows from the external first space toward the first internal hole 211a of the first fan 240a, the first external hole 221a, and the dust sensor 210, It is sufficient to implement a sealing structure so that air in another space does not flow into the fan 240a only.

This is because, in the area after that, that is, in the area where the force that pushes back the air drawn by the fan 240 acts, the air to be measured (here, the air in the outer first space) leaks into the gap where it can not be sealed, There is no fear that air (air in the second external space or the like) will flow in.

This is also the case when a flow rate is formed from the second external space to the second fan 240b, the second external hole 221b, and the second internal hole 211b of the dust sensor 210. [ That is, it is sufficient to implement a sealing structure so that air in another space does not flow only from the second external space to the second fan 240b.

For this reason, the first fan 240a may be provided on the outer side of the first outer hole 221a, and the second fan 240b may be provided on the outer side of the second outer hole 221b. That is, when each fan 240 is provided inside the outer hole 221, it is necessary to seal up the outer hole 221.

The controller of the dust measuring apparatus 200 may selectively drive the first fan 240a or the second fan 240b to selectively measure the dust in the air in the first external space or the air in the external second space . When measuring the concentration of air dust in the external first space, the second fan 240b may be used to measure the air dust concentration in the external second space without driving the first fan 240a and driving the second fan 240b, So that the first fan 240a is not driven.

If it is desired to measure both the dust concentration of the first external space and the external second space, the first fan 240a and the second fan 240b may be driven with a time difference to obtain a result.

It is necessary for the control unit to separately measure the concentration of dust in the air with respect to the flow rate generated by the driven fan 240. [ That is, since the dust sensor 210 does not sense the flow direction of the air by itself, the control unit must distinguish and correspond to it. As the change in the measurement result of the dust due to the change of the air flow direction becomes more certain, the control section can easily distinguish it.

The size and rotational speed of the fan 240, etc., may be factors that determine the air flow rate with the size and shape of the path that forms the flow rate, which affects precise dust measurement. That is, it is necessary to optimize the air flow rate for accurate dust measurement.

- Example 2-2 -

Example 2-2 measures air and dust in two spaces using a venturi tube. Unlike the embodiment 2-1, the embodiment 2-2 measures the air condition of one of the first space and the second space, measures the mixed air condition of the first space and the second space, Measure the air condition.

4 is a conceptual diagram of an air flow of the dust measurement apparatus 200 of the present invention related to Embodiment 2-2.

Particularly, FIG. 4 shows an example in which the fan in the embodiment 2-2 is provided in the path from the external second space. However, in some cases, the fan may be provided in a path through which the fan flows in the first external space.

The venturi tube 330 is connected to the inlet 311 of the dust sensor 310. The venturi pipe 330 may include a first tube hole 331 for forming a path for entering the venturi pipe in the first external space and a second tube hole 331 for forming a path for entering the venturi pipe in the external second space. Hole 332. In this embodiment,

Here, the dust sensor 310 has the same shape as that of the dust sensor 210 in the embodiment 2-1 unless otherwise noted. However, the dust sensor 310 of the embodiment 2-2 can perform sensing in one direction rather than the two-direction sensing.

Each air introduced through the first tube hole 331 or the second tube hole 332 may have a structure to be mixed in the venturi tube 330. The air in the two spaces mixed with each other passes through the outlet 333 of the venturi pipe 330 and can be introduced into the inlet of the dust sensor 310 described above.

The air introduced into the inlet 311 of the dust sensor 310 is discharged to the outlet of the dust sensor to measure the air condition.

The venturi pipe 330 is connected to both the outer first space and the outer second space through the first tube hole 331 and the second tube hole 332 when the pressure is high, . On the other hand, when the pressure is low, that is, when the velocity of inflow air is small, air in one of the first tube hole 331 and the second tube hole 332 flows.

That is, the air condition of the first space and the second space are calculated by comparing the dust state of the mixed air in the first space and the second space with the dust state of air in the one space of the first space and the second space.

The third fan 340 is provided at one side of the first tube hole 331 or the second tube hole 332 to form a flow rate in the venturi tube 330. The third fan 340 is disposed at a position corresponding to the flow direction of the dust sensor 310 so as to allow air to flow into the second tube hole 332 when the pressure of the venturi pipe 330 is low, .

When the third fan 340 is provided in the first tube hole 331, the air in the first space flows into the venturi pipe 330 and the dust sensor 310 When the third fan 340 is provided in the second tube hole 332, air in the second space will be introduced into the venturi pipe 330 and the dust sensor 310.

If the pressure is lower than the first pressure, the control unit drives the third fan 340. If the pressure exceeds the first pressure, May not be driven.

As in the embodiment 2-1, the embodiment 2-2 also generates the pressure in the direction of pushing the outside air to the dust sensor 310 through the fan 340, so that the pressure in the direction from the outside space to the third fan 340 It is enough to seal only the air so that the air in the other space does not enter.

- Example 2-3 -

One of the dust measuring devices for measuring the air condition of the two spaces may include a dust measuring device 400 having two sensors and one fan.

5 is a conceptual diagram of the air flow of the dust measurement device 200 of the present invention related to the embodiment 2-3.

The first dust sensor 410a measures the air condition of the external first space and the second dust sensor 410b measures the air condition of the external second space.

The outlet of the first dust sensor 410a and the outlet of the second dust sensor 410b both form a flow rate by the fourth fan 440.

The fourth fan mounting portion 430 mounts a fourth fan 440 forming a flow rate and has a first inlet 431a through which air having a flow rate formed by the fourth fan 440 flows, 431b. The outlet of the first dust sensor 410a is connected to the first inlet 431a and the outlet of the second dust sensor 410b is connected to the second inlet 431b.

In this embodiment, since the two sensors 410a and 410b are used, the first dust sensor 410a and the second dust sensor 410b can be used at the same time, thereby minimizing the measurement time.

In addition, since the air in the external first space and the air in the external second space are not mixed in the path of the air to the dust sensors 410a and 410b, the space for noise generation can be minimized.

The first dust sensor 410a and the second dust sensor 410b may be provided on a single substrate 420. The first dust sensor 410a and the second dust sensor 410b mounted on the substrate 420 can be controlled by one control unit and can receive power from one power supply unit.

- Example 2-4 -

Embodiment 2-4 has the form of a dust measuring apparatus 500 having a bidirectional fan capable of selectively forming a flow rate in both directions.

6 is a conceptual diagram of the air flow of the dust measurement apparatus 200 according to the embodiment 2-4 of the present invention.

The dust sensor 510 may be provided at one point in the entire air flow path.

At this time, the dust sensor 510 can be measured in both directions. A first hole 512a and a second hole 512b are provided on both sides of the sensing path 511 of the dust sensor 510. The first hole 512a on one side of the sensing path 511 of the dust sensor 510 is provided on the outer first space side with respect to the sensing portion and the second hole 512b on the other side of the sensing path 511 is provided on the outer side with respect to the sensing portion, 2 is located on the space side.

The bi-directional fan 540 is provided at either one of the first hole 512a or the second hole 512b.

Direction fan 540 is provided in the fan mounting unit 530 and one side 531a of the fan mounting unit 530 is connected to the first external space and the fan mounting unit 530 And the other side 531b may be connected to the external second space.

One side of the flow amount formed by the bidirectional fan 540 is conceptually connected to the external first space and the other side is connected to the external second space.

6 shows a flow path of the air in the order of the external first space, the dust sensor 510, the two-way fan 540 and the external second space. However, the external second space, the dust sensor 510, The first space 540 and the first external space.

When the air condition of the external first space is measured, the control unit drives the both-way fan 540 to form a flow rate from the external first space toward the external second space. On the other hand, when the air condition of the external second space is measured, Directional fan 549 so that a flow rate is formed from the second space toward the external first space.

In this embodiment, since the air condition of the two spaces can be measured by one dust sensor and one fan, there is an advantage that the structure is relatively simple.

However, when the dust sensor 510 is used as a reference, the two-way fan performs both of sucking and blowing air. Therefore, it is necessary to complete the sealing of each point based on the above-mentioned reason.

Figs. 7 and 8 show a specific embodiment of the dust measurement device 200 of the first embodiment.

FIG. 7 is an assembled perspective view of a dust measurement apparatus 200 related to the present invention, and FIG. 8 is an exploded perspective view of a dust measurement apparatus 200 related to the present invention.

The main body housing 220 may have a polyhedral shape such as a rectangular parallelepiped.

The main body housing 220 may include two surfaces facing each other, and the first outer hole 221a and the second outer hole 221b may be formed on two facing surfaces. The first outer hole 221a and the second outer hole 221b may be provided in parallel in particular.

That is, the best mode is that the first outer hole 221a and the second outer hole 221b are provided on the same line.

When the first outer hole 221a and the second outer hole 221b are provided on the same line, fluid such as air flows from the first outer hole 221a to the second outer hole 221b and the second outer hole 221b It is possible to minimize the occurrence of unintended turbulence when flowing from the first outer hole 221a to the first outer hole 221a, which means that the above-described responsiveness is improved.

The main body housing 220 may be provided in the form of a seating part 2201 forming a mounting part in a recessed area and a cap 2202 covering a seating part 2201. [ When the cap 2202 covers the seating part 2201, the area excluding the first outer hole 221a and the second outer hole 221b is sealed. Closed means that it is completely sealed and does not mean that air can not escape or enter, meaning that it is blocked from the outside without significantly interfering with the flow in other areas of intended use.

In the present invention, both the sealing and the sealing are closed to such an extent that an object such as an object can not pass through. However, the sealing is a state in which small particles such as air or dust can enter and out, Can not be accessed. That is, sealing can be a more limited concept of sealing.

The dust sensor 210 may be mounted on the body housing 220 in a form mounted on the mounting board 251. The mounting board 251 may be directly or indirectly connected to the main board 252. A controller for controlling the dust sensor 210 or the fan may also be provided on the main board 252. The control unit may be provided as a chip in the form of an application processor (AP). The main body housing 220 may also include a battery serving as a power supply unit.

The mounting board 251 and the main board 252 may be fixed to the seating guide unit 253 formed in the main housing 220. The seating guide part 253 may have a shape corresponding to the boundary area of the mounting board 251 or the main board 252.

Figure 9 illustrates one embodiment of a dust sensor 210 in accordance with the present invention.

The dust sensor 210 may be optically provided as described above. That is, the amount of relative dust in the incoming air can be optically sensed.

The dust sensor 210 may include a sensing path 214 through which air and dust pass. Both holes serving as an inlet or an outlet of the sensing path 214 may be the first inner hole 211a and the second inner hole 211b.

The sensing unit 213 for measuring the amount of dust by irradiating light is provided at one point on the sensing path 214 formed by the first inner hole 211a and the second inner hole 211b.

When air flows in both directions with respect to the sensing path of the dust sensor 210, each of the first inner hole 211a and the second inner hole 211b functions as an inlet and an outlet.

The air including the dust flows in the order of the first inner hole 211a, the sensing portion and the second inner hole 211b, and can measure the dust state of the air introduced from the first inner hole 211a, The sensing part 213 and the first inner hole 211a in this order and measure the dust state of the air introduced from the second inner hole 211b.

An inlet hole and an outlet hole are defined as the outlets of the first inner hole 211a and the second inner hole 211b.

The dust sensor may have an additional hole, such as a third inner hole 217. The third inner hole 217 may have a wider opening than the first inner hole 211a and the second inner hole 211b to facilitate access to the sensing unit 213. [

The sensing unit 213 can be cleaned through the third inner hole 217 to improve the recognition accuracy.

The third inner hole 217 may be mounted in the main body housing 220 in an open state, but may be closed to minimize the noise generation if necessary. The blocking may be implemented by tape or the like.

The dust concentration measurement accuracy of the dust sensor 210 may vary depending on the flow rate and flow rate of the introduced air, and the stability of the elements. Therefore, in order to increase the accuracy of the dust concentration measurement, a proper flow rate and flow rate of the inflow air are required, and this proper condition needs to be maintained continuously.

10 is a cross-sectional view taken along the line A-A 'in FIG.

7 and 8 together for convenience of explanation.

The vent bracket 270 connects the inner hole 211 provided in the dust sensor 210 and the outer hole 221 provided in the main body housing 220 to form an air flow path.

The vent bracket 270 may include a first vent bracket 270a and a second vent bracket 270b. The first vent bracket 270a forms a path between the first inner hole 211a and the first outer hole 221a and the second vent bracket 270b forms a path between the second inner hole 211b and the second outer hole 221a. (221b).

The vent bracket 270 may affect the flow rate and the flow rate of air flowing from the outer hole 221 to the inner hole 211 or from the inner hole 211 to the outer hole 221.

Specifically, the vent bracket 270 forms a path of fluid between the outer hole 221 and the inner hole 211 to prevent air from flowing unnecessarily to another area of the inner space of the main housing 220.

The vent bracket 270 has a vent hole 271 which is a flow path from the outer hole 221 to the inner hole 211. The vent hole 271 may have a specific cross-sectional shape to affect flow rate and flow rate.

The vent hole 271 of the vent bracket 270 serves as a nozzle when the sectional area decreases from the outer hole 221 to the inner hole 211 and the inner hole 211 ), It is possible to perform a role of a diffuser when the cross-sectional area increases.

The shape and additional function of the vent bracket 270 will be described later.

The shape of the vent hole 271 of the vent bracket 270 is not limited to the shape and size of the flow passage between the outer hole 221 and the inner hole 211 and consequently the shape and size of the outer hole 221 and the inner hole 211 .

The vent bracket 270 may be provided in a replaceable form that can be applied differently if desired.

The vent bracket 270 may include a mesh filter to perform a filtering function. The mesh filter serves to prevent the introduction of substances other than the object to be measured and to damage the apparatus or to generate noise in the measurement result.

Mesh filters can also affect flow rates and flow rates by influencing the cross-sectional area at which air and dust enter or exit at the same time.

The vent bracket 270 may be coupled to the inner hole 211 from the outside of the main body housing 220 to be fixed to the inner hole 211.

The vent bracket 270 may be fixed to the outer surface of the body housing 220, in particular, to the fan seat 290 in a fit manner.

The fan 240 may be provided outside the outer hole 221. The fan 240 serves to introduce the air in the external space into the internal space of the body housing 220, in particular, the sensing path 214 to the vent bracket 270 and the dust sensor 210.

The first fan 240a is provided at a position corresponding to the first outer hole 221a and the second fan 240b is provided at a position corresponding to the second outer hole 221b. The first fan 240a may be provided outside the first outer hole 221a and the second fan 240b may be provided outside the second outer hole 221b.

The fan 240 may be secured to the body housing 220 via the support bracket 280. The support bracket 280 may provide the rotational axis of each of the first fan 240a and the second fan 240b.

The fan mounting portion 290 fixes the support bracket 280. The fan mounting portion 290 forms an inner space by forming an outer wall protruding from the outer surface of the main body housing 220, and the supporting bracket 280 can be fixedly inserted into the inner space.

The sealing bracket 260 protects the fan 240 and the support bracket 280 from being directly exposed to the outside. The ceiling bracket 260 has a shape corresponding to the outer wall one end outer surface 292 of the fan seating portion 290 of the main body housing 220 and is coupled to the main housing 220 including the fan seating portion 290 .

The sealing bracket 260 forms a flow path from the external space to the fan 240. The shape and size of the sealing bracket 260 affect the flow rate and flow rate of the air flowing into the dust sensor 210.

The air in the internal space 262 of the ceiling bracket 260 flows into the fan 240. The internal space must inevitably have an area covering the outside of the fan 240 or the support bracket 280, The flow rate and the flow rate of the air may be restricted. The inflow hole 261 overcomes the structural constraints of this sealing bracket 260.

The inlet hole 261 forms a hole protruded outward from the sealing bracket 260 to connect the external space to the internal space 262 of the sealing bracket 260.

The inlet hole 261 may have a smaller width than the internal space 262 of the sealing bracket 260. That is, the shape leading from the small-width inlet hole 261 to the large-width sealing bracket 260 internal space 262 serves as a diffuser for the incoming air. The shape of the diffuser can slow the flow rate of air reaching the fan 240. The pressure or flow rate of the external space is not an element that can be controlled by the dust measuring apparatus 100 and therefore the flow rate or the flow rate into the dust sensor 210 may be unintentionally changed due to the pressure or flow rate of the external space. The shape of the diffuser minimizes the effect of these variables.

Particularly, the shape having a width that rapidly increases from the inflow hole 261 to the inner space 262 of the sealing bracket 260 generates turbulence, thereby allowing a high flow rate and a flow rate from the external space to be appropriately adjusted.

The width of the inflow hole 261 and the internal space 262 of the sealing bracket 260 is based on one direction perpendicular to the direction of the flow path. The concept of the width described above may be replaced with the concept of the cross sectional area. That is, the characteristic of the relationship between the widths of the inflow hole 261 and the internal space 262 of the sealing bracket 260 can be equally applied to the cross-sectional area of the flow path.

By this feature, the influence of the state of the external space can be minimized, and the size and shape of the vent hole 261 and the vent bracket 270, as well as the rotation speed of the fan 240, The accuracy of the dust concentration measurement of the dust sensor 210 can be improved.

The inlet hole 261 may have a protruded columnar outer surface, so that the structure of the connection tube or the like may be further combined to extend the flow path.

As described above, in the case of Embodiment 2-1, since the fan 240 pushes the air in the external space to the dust sensor 210, only the sealing of the flow passage area reaching the fan 240 from the external space is considered It suffices.

In this respect, sealing is required for the gap between the inlet hole 261 and the sealing bracket 260. [

Particularly, when the inflow hole 261 and the sealing bracket 260 are integrally injected, the sealing operation for the gap between the inflow hole 261 and the sealing bracket 260 can be omitted. However, when the inlet hole 261 of the sealing bracket 260 is directly exposed to the external space having the air to be measured, separate sealing is not required. However, Sealing is additionally required in the gap between the connection tube and the sealing bracket 260 when exposed to the space.

If the negative pressure generated in the fan 240 affects the gap between the ceiling bracket 260 and the fan seat 290, the air in the other area may flow into the gap, Do.

As described above, the flow rate of the air flowing from the measurement target space to the dust sensor 210 is an important factor for increasing the sensing accuracy. The configuration for determining the flow rate of the air includes the vent bracket 270, the fan seat 290, And a ceiling bracket 260, and a fan 240 for adjusting the pressure.

FIG. 11 is a perspective view showing a state in which the venting bracket 270 and the dust sensor 210 of the dust measuring apparatus 200 according to the present invention are engaged with each other. FIG. 12 is a perspective view of the venting bracket 270 and the dust sensor 210, and FIG. 13 is a schematic cross-sectional view in the direction BB 'of FIG.

11 to 13 are referred to for convenience of explanation.

The vent bracket 270 is provided in an area corresponding to the inlet hole 211c of the dust sensor 210 to control the flow rate of the air flowing into the inlet hole 211c of the dust sensor 210. [ The inlet hole 211c may be either the first inner hole 211a or the second inner hole 211b as described above.

The impact plate 273a is provided at one point inside the vent bracket 270. The impingement plate 273a functions to cover the vent hole 271 formed by the vent bracket 270, that is, the central area of the inner flow path.

The collision plate 273a largely serves two functions.

First, when particles larger than the target particles are introduced together by the impingement plate 273a, large particles are collided to minimize entry into the inlet hole 211c of the dust sensor 210. The collision phenomenon is more likely to occur when the particle size is larger. Therefore, only the particles to be sensed flow into the dust sensor 210, thereby enabling accurate measurement.

Second, it acts to block the light coming from the outside. When the dust sensor 210 is optically provided, it is sensed by the light of the dust sensor 210 itself, and the light incident from the outside causes deterioration in sensing accuracy. The impingement plate 273a minimizes the possibility of such external light input, which can assist in accurate measurement.

When the collision plate 273a is not taken into account, the entire flow path inside the vent bracket 270 may have a shape in which the cross-sectional area decreases and then decreases. A region having a smaller cross sectional area than the vent hole 271 is defined as the diffuser portion 275 and the nozzle portion 274 and the configuration of the air inlet side with respect to the vent bracket 270 is defined as the diffuser portion 275, And the configuration of the outflow side is defined as the nozzle portion 274.

The diffuser portion 275 may be formed at the entrance of the vent bracket 275 to form a narrower cross-sectional area than the vent hole 271, which is an internal flow passage of the vent bracket 275. The nozzle portion 274 may be formed at the outlet of the vent bracket 270 to form a narrower cross-sectional area than the vent hole 271, which is an internal flow passage of the vent bracket 270. An inner surface of the nozzle portion 274 is formed with an inclined surface 274a whose sectional area gradually decreases toward the direction of the dust sensor 210 in order to minimize the occurrence of turbulence when air flows into the dust sensor 210 through the nozzle portion 274. [ ).

The air in the space to be measured flows into the inlet hole 211c of the dust sensor 210 through the diffuser portion 275, the vent hole 271 and the nozzle portion 274. Therefore, the air passes through the narrow cross-sectional area along the flow, passing over the wide cross-sectional area again, and then the narrow cross-sectional area. By this flow, the flow rate reaching the dust sensor can be adjusted appropriately, and at the same time, the probability of occurrence of noise by other particles can be minimized.

The flow path through the vent bracket 270 is preferably circular. The circular flow path minimizes the possibility of noise due to unintended turbulence during the movement of the air. Therefore, the cross section of the vent hole 271, the inner peripheral surface of the diffuser portion 275, and the inner peripheral surface of the nozzle portion 274 may all be circular. For the same reason, it is preferable that the impingement plate 273a is also provided in a circular shape.

Particularly, in order to smooth the flow rate of air and minimize the occurrence of unintended turbulence and the like, the cross section of the vent hole 271, the inner peripheral surface of the diffuser portion 275, the inner peripheral surface of the nozzle portion 274, Each of the centrifugal chambers 273a can form the same axis.

According to the experimental results, it is preferable that the diameter A in the cross section of the diffuser portion 275 is about 4 mm and the diameter B of the impingement plate 273a is about 6 mm. Sectional diameter C of the nozzle portion 274 is excellent as it is smaller, but may be about 1.5 mm for reasons such as machining.

The impact plate 273a needs to be configured to fix the impact plate 273a in order to position the impact plate 273a at the center with respect to the width direction of the vent hole 271. [

The support frame 273b is supported and fixed by the vent bracket 270 and the connection bridge 273c can serve to connect the support frame 273b and the collision plate 273a. The connection bridge 273c can hold the impingement plate 273a in a minimized form so as not to disturb the flow of the air passing through the vent hole 271 as much as possible. For example, two connection bridges 273c may be provided on both sides of the impingement plate 273a in a linear form and connected to the support frame 273b. Or three or more connection bridges 273c may be provided to secure sufficient rigidity to connect the support frame 273b and the collision plate 273a.

The support frame 273b, the connection bridge 273c, and the impingement plate 273a may be made of members of the same layer. In this case, it is advantageous that the support frame 273b, the connection bridge 273b and the collision plate 273a are integrally provided. In a typical form, it can be formed integrally through an injection process. When the support frame 273b, the connection bridge 273c and the collision plate 273a are integrally formed, it is referred to as an integrated collision plate 273 for convenience of explanation.

In the case of the integral impact plate 273, it can be assembled and fixed to the vent bracket 270.

However, when the vent bracket 270 has the diffuser portion 275 and the nozzle portion 274, the integral impact plate 273 can not simply fit into the vent bracket 270 due to the size limitation of the inlet. The vent bracket 270 may be provided in a separate coupling form of the inner member 2701 and the outer member 2702 in order to engage the integral impact plate 273. [

The inner member 2701 may include a nozzle portion 274 and may be engaged with the inlet hole 211c of the dust sensor 210. [ Particularly, the nozzle portion 274 of the inner member 2701 can be fitted and fixed to the inlet hole 211c of the dust sensor 210.

The outer member 2702 includes a diffuser portion 275 and can be coupled to the outside of the inner member 2701.

The integral impingement plate 273 can be fixedly inserted between the inner member 2701 and the outer member 2702. The inner member 2701 has a stepped portion 2703 having an inner peripheral surface larger in diameter than the diameter of the vent hole 271 in order to maintain the inner peripheral surface of the vent bracket 270, that is, the diameter of the vent hole 271, . The outer member 2702 and the integral impingement plate 273 are engaged with the stepped portion 2703 so that the concave and convex region due to the support frame 273b or the outer member 2702 is not generated and the diameter of the vent hole 271 is reduced, As shown in FIG.

This makes it possible to form a continuous surface with a constant diameter of the vent hole 271, thereby minimizing disturbance of air flow.

FIG. 14 is a graph showing measured values of the dust collection efficiency according to the particle size of the dust sensor according to the present invention. FIG.

Here, the dust collection efficiency means a ratio of the number of particles collected to the dust sensor to the number of collected particles. Therefore, the higher the dust collection efficiency, the more the dust is filtered before reaching the sensor. Referring to the results of one embodiment of the dust sensor and the vent bracket having the above characteristics, it can be seen that the particles having a diameter of 7 μm or more have a dust collecting efficiency close to 100%. That is, it is shown that it can be measured by reaching the dust sensor mainly for the micro-tenant. Here, the ultra-fine particle refers to a particle size of 2.5 μm or less.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

The foregoing detailed description should not be construed in all aspects as limiting and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

100: dust measuring device 200: first embodiment dust measuring device
210: Dust sensor 211: Inner hole
211a: first inner hole 211b: second inner hole
213: sensing unit 214: sensing path
215: mounting board 216: power supply terminal
217: third inner hole 220: main housing
2201: seat part 2202: cap
221: outer hole 221a: first outer hole
221b: second outer hole 211c: entrance hole
223: extension part 240: fan
240a: first fan 240b: second fan
252: main board 253: seat guide part
260: sealing bracket 260a: first sealing bracket
260b: second sealing bracket 261: inlet hole
262: Sealing bracket internal space 270: Vent bracket
270a: first vent bracket 270b: second vent bracket
2701: inner member 2702: outer member
2703: stepped portion 271: vent hole
273: Integrated impact plate 273a: Collision plate
273b: Support frame 273c: Connection bridge
274: nozzle portion 274a: inclined surface
275: diffuser part 280: support bracket
280a: first support bracket 280b: second support bracket
281: Coupling hole 290: Fan seat part
291: protrusion fixing portion 292: fan mounting portion outer wall one end outer surface
300: Second Embodiment Dust measuring device 310: Dust sensor
311: Dust sensor inlet 330: Venturi tube
331: first tube hole 332: second tube hole
333: Venturi tube outlet 340: Third fan
400: Third Embodiment Dust measuring device 410a: First dust sensor
410b: second dust sensor 420: substrate
430: fourth fan mounting portion 431a: first inlet
431b: second inlet 440: fourth fan
500: Fourth Embodiment Dust measuring device 510:
511: sensing path 512a: sensing path first hole
512b: sensing path second hole 530: bi-directional fan mounting part
531a: Both-way fan mounting part one side 531b: Two-way fan mounting part other side
540: Bi-directional fan 610: Conventional dust sensor
611: Conventional dust sensor inlet 612: Conventional dust sensor outlet
620: Conventional dust sensor mounting part 621: Mounting part entrance
622: mounting part outlet 630: solenoid valve
631a: first space inlet 631b: second space inlet
640: Fan

Claims (9)

Dust sensor;
A fan which forms a flow rate at which air in the measurement target space flows from the inlet hole to the outlet hole of the dust sensor;
A vent bracket provided in an area corresponding to the inlet hole of the dust sensor to form a vent hole for regulating a flow rate of air flowing into the inlet hole of the dust sensor; And
And an impingement plate provided at a position inside the vent hole to cover a central area of the vent hole. The method according to claim 1,
The vent bracket
A diffuser portion formed at the inlet to form a cross sectional area narrower than the vent hole; And
And a nozzle portion formed at the outlet to form a cross sectional area narrower than the vent hole. 3. The method of claim 2,
Wherein an end face of the vent hole, an inner peripheral face section of the diffuser section, an inner peripheral face section of the nozzle section, and the impingement plate are circular. The method of claim 3,
Wherein an end surface of the vent hole, an end surface of the inner circumferential surface of the diffuser portion, an end surface of the inner circumferential surface of the nozzle portion, and respective centrifuges of the impingement plate form the same axis. The method of claim 3,
Sectional diameter of the diffuser portion is 4 mm,
Sectional diameter of the nozzle portion is 1.0 mm or more and 1.5 mm or less,
Wherein the diameter of the impingement plate is 6 mm. 3. The method of claim 2,
The vent bracket
An inner member including the nozzle portion and engaged with an inlet hole of the dust sensor; And
And an outer member including the diffuser portion and coupled to an outer side of the inner member. The method according to claim 6,
A support frame supported and fixed to the vent bracket; And
And a connection bridge connecting the support frame and the impact plate. 8. The method of claim 7,
Wherein the inner member includes a stepped portion having an inner peripheral surface larger than the diameter of the vent hole,
Wherein the outer member and the support frame are seated and fixed to the step portion, and the diameter of the vent hole is kept constant. 3. The method of claim 2,
Wherein the inner surface of the nozzle portion includes an inclined surface whose sectional area is gradually narrowed toward the direction of the dust sensor.

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