CN217404077U

CN217404077U - Particulate matter sensor

Info

Publication number: CN217404077U
Application number: CN202122972327.3U
Authority: CN
Inventors: 武斌; 申涛
Original assignee: Shenzhen Meisi Xianrui Electronic Co ltd
Current assignee: Shenzhen Meisi Xianrui Electronic Co ltd
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2022-09-09
Anticipated expiration: 2031-11-30

Abstract

The utility model discloses a particulate matter sensor, place box body, particulate matter concentration detection module and the control module who sets up the air inlet in including. The utility model adopts the laser scattering principle and utilizes the algorithm based on the Mie's theory to obtain the equivalent particle size of the particles and the number of the particles with different particle sizes in unit volume; displaying the currently measured concentration of the particulate matters on a built-in screen of the device; in addition, the user can select to start the sound-light alarm function, and when the concentration of the particulate matters reaches a set threshold value, the alarm function is triggered; the device is internally integrated with wireless and wired communication modes to communicate with external equipment.

Description

Particulate matter sensor

Technical Field

The utility model belongs to the technical field of particulate matter concentration detection, concretely relates to particulate matter sensor.

Background

With the continuous improvement of the living standard of people, people pay more and more attention to physical and psychological health; dust particles in the air can affect the health of people and easily cause various respiratory diseases, so that the air quality condition needs to be known in real time to help people to take preventive measures in time. Most of prior art encapsulates into the module form with dust detection, can not directly show particulate matter concentration under the current environment, and the user uses more difficultly, and the module size differs, does not have the standard.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model discloses a main aim at provides a particulate matter sensor has solved prior art and has packaged into the module form with dust detection, can not the direct display particulate matter concentration under the current environment, and the user uses more difficulty, and the problem that the module size differs.

In order to achieve the above purpose, the technical scheme of the utility model is realized as follows: a particle sensor comprises a box body, a particle concentration detection module and a control module, wherein the box body is internally provided with an air inlet; after gas containing particles enters the box body through the gas inlet and contacts the particle concentration detection module, when the particle concentration detection module detects that the concentration content of the current gas particles exceeds an alarm value, the alarm module integrated in the control module is triggered to alarm, and the gas containing the particles is linked with external equipment through a wireless communication protocol and/or a wired communication interface built in the control module to ventilate.

Preferably, the box body is further provided with a display module, and the display module is connected with the control module and used for displaying the current particulate matter concentration content value detected by the particulate matter concentration detection module.

Preferably, particulate matter concentration detection module includes lid, air flue subassembly, signal processing circuit board, photodiode, laser module, miniature fan and lower lid, go up the lid and be connected with lid down, from last air flue subassembly and the signal processing circuit board of connecting gradually extremely down in it, a terminal surface of signal processing circuit board is provided with photodiode, another terminal surface of signal processing circuit board is provided with laser module, miniature fan.

Preferably, the air flue component comprises an air flue inlet, a laser module shell, an optical trap, an air flue outlet and an air flue shell, wherein the air flue inlet is formed in one side of the air flue shell, the laser module shell is arranged on one side of the air flue inlet, the optical trap is arranged at the light outlet end of the laser module shell, the air flue outlet is formed in the lower portion of the laser module shell, and the upper portion of the air flue outlet corresponds to the position of the micro fan.

Preferably, the light-emitting end of laser module casing is provided with side hole and below hole, the side hole is used for the laser module to shine the air that awaits measuring, produces the scattered light when meetting the particulate matter in the air that awaits measuring, the below hole is located photodiode's top for the scattered light that sends when the particulate matter in the air is shone to laser module transmission laser reachs photodiode through the below hole.

Preferably, the laser module is a red laser module with a wavelength of 650nm, a green laser module with a wavelength of 520nm or a blue laser module with a wavelength of 450nm, and comprises a metal shell and a built-in laser collimating lens.

Preferably, the signal processing circuit board is integrated with a driving circuit for driving the micro fan and a signal filtering and amplifying circuit, the micro fan driving circuit provides a stable voltage for the micro fan through a voltage stabilizing chip, and the signal filtering and amplifying circuit comprises an operational amplifier which performs two-stage amplification on a weak electrical signal output by the photodiode, so as to facilitate subsequent signal processing.

Preferably, the box body is further provided with a touch key connected with the control module and used for setting a particulate matter concentration alarm value.

Compared with the prior art, the utility model adopts the laser scattering principle, and utilizes the algorithm based on the Mie's theory to obtain the equivalent particle size of the particles and the number of the particles with different particle sizes in unit volume; displaying the currently measured concentration of the particulate matters on a built-in screen of the device; in addition, the user can select to start the sound and light alarm function, and when the concentration of the particulate matters reaches a set threshold value, the alarm function is triggered; the device is internally integrated with wireless and wired communication modes to communicate with external equipment.

Drawings

Fig. 1 is a schematic perspective view of a particle sensor provided in embodiment 1 of the present invention;

fig. 2 is an exploded schematic view of a particle sensor provided in embodiment 1 of the present invention;

fig. 3 is a schematic structural diagram of a particulate matter concentration detection module in a particulate matter sensor provided in embodiment 1 of the present invention;

fig. 4 is a schematic structural diagram of an air duct assembly in a particle sensor provided in embodiment 1 of the present invention;

fig. 5 is a schematic structural diagram of a laser module in a particle sensor provided in embodiment 1 of the present invention;

fig. 6 is a schematic structural diagram of a signal filtering and amplifying circuit in a particle sensor provided in embodiment 1 of the present invention;

fig. 7 is a schematic structural diagram of a micro fan driving circuit in a particle sensor provided in embodiment 1 of the present invention;

fig. 8 is a flow chart of measuring the concentration of particulate matter in a particulate matter sensor provided in embodiment 1 of the present invention;

fig. 9 is a flowchart of the operation of the particulate matter concentration detection module provided in embodiment 1 of the present invention;

fig. 10 is a block flow diagram of a control method of a particulate matter sensor provided in embodiment 2 of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

In the description of the present invention, it should be clear that the terms "vertical", "horizontal", "longitudinal", "front", "rear", "left", "right", "up", "down", "horizontal", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description of the present invention, and do not mean that the device or element referred to must have a specific orientation or position, and thus, cannot be construed as limiting the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The embodiment of the utility model provides a particulate matter sensor, as shown in fig. 1-9, include the box body 1, the particulate matter concentration detection module 2 and the control module 3 which are provided with the air inlet 11 and are arranged in the interior, the particulate matter concentration detection module 2 is connected with the control module 3; when gas containing particulate matters enters the box body 1 through the gas inlet 11 and contacts the particulate matter concentration detection module 2, when the particulate matter concentration detection module 2 detects that the concentration content of the current gas particulate matters exceeds an alarm value, the alarm module integrated in the control module 3 is triggered to alarm, and the gas containing the particulate matters is linked with external equipment through a wireless communication protocol and/or a wired communication interface built in the control module 3 to ventilate.

After adopting above-mentioned scheme, through set up particulate matter concentration detection module 2, control module 3 in box body 1, realized measuring indoor particulate matter concentration.

As shown in fig. 1 and 2, the box body 1 is further provided with a display module 5, and the display module 5 is connected with the control module 3 and is used for displaying the current particulate matter concentration content value detected by the particulate matter concentration detection module 2.

Like this, through integrateing alarm module in control module 3 to couple together display module 5 and control module 3, effectual realized reminding whether normal and the purpose of real-time demonstration indoor particulate matter concentration of indoor particulate matter concentration, and then promoted whole device's market competitiveness and quality.

As shown in fig. 3, the particulate matter concentration detection module 2 includes an upper cover body 21, an air channel assembly 22, a signal processing circuit board 23, a photodiode 24, a laser module 25, a micro fan 26 and a lower cover body 27, the upper cover body 21 is connected with the lower cover body 27, the air channel assembly 22 and the signal processing circuit board 23 are sequentially connected in the upper cover body 21 from top to bottom, one end face of the signal processing circuit board 23 is provided with the photodiode 24, and the other end face of the signal processing circuit board 23 is provided with the laser module 25 and the micro fan 26.

As shown in fig. 4, the air duct assembly 22 includes an air duct inlet 221, a laser module housing 222, a light trap 225, an air duct outlet 227 and an air duct housing 228, the air duct inlet 221 is disposed on one side of the air duct housing 228, the laser module housing 222 is disposed on one side of the air duct inlet 221, the light outlet end of the laser module housing 222 is disposed with the light trap 225, the air duct outlet 227 is disposed below the laser module housing 222, and the position above the air duct outlet 227 corresponds to the position of the micro fan 26.

As shown in fig. 4, the light-emitting end of the laser module housing 222 is provided with a lateral hole 223 and a lower hole 224, the lateral hole 223 is used for the laser module 25 to irradiate the air to be measured and generate scattered light when encountering particles in the air to be measured, the lower hole 224 is located above the photodiode 24, and the scattered light emitted when the laser module 25 emits laser light to irradiate the particles in the air reaches the photodiode 24 through the lower hole 224;

as shown in fig. 5, the laser module 25 is a red laser module with a wavelength of 650nm, a green laser module with a wavelength of 520nm, or a blue laser module with a wavelength of 450nm, and includes a metal housing 2221 and a built-in laser collimating lens 2222.

As shown in fig. 6 and 7, a driving circuit for driving the micro fan and a signal filtering and amplifying circuit are integrated on the signal processing circuit board 23, the micro fan driving circuit provides a stable voltage for the micro fan through a voltage stabilizing chip U5, and the signal filtering and amplifying circuit includes an operational amplifier U2, which performs two-stage amplification on a weak electrical signal output by the photodiode 24, so as to facilitate subsequent signal processing.

The measurement flow on the signal processing circuit board is as shown in fig. 8 and fig. 9, after the module is initialized, the laser module 25 enters a modulation state, namely, on for 0.5s and off for 0.5 s; within 0.5s of laser lighting, the photodiode 24 continuously receives scattered light generated by laser irradiation on the particulate matters and generates electric signals, and after 0.5s of time is finished, the microprocessor reads a pulse count value and sends out a calculated particulate matter concentration value; and when the 1s period is timed out, the module repeats the measurement operation. It should be noted that the settling time of the micro fan 26 should not be less than 30s, so as to avoid the inaccuracy of the measurement result due to the difference of the wind speeds of the micro fans.

Further, the box body 1 is also provided with a touch key 6 connected with the control module 3 for setting a particulate matter concentration alarm value.

The embodiment of the utility model provides a particulate matter sensor's theory of use who provides does:

the utility model discloses the device is mainly installed on the indoor wall, through built-in miniature fan 26 with the air extraction and send into the air flue subassembly 2 that has designed, the light that laser module 25 sent shines the air that awaits measuring through side square hole 223, when there is the particulate matter in the air, laser module 25 shines and produces the scattering on the particulate matter, use photodiode 223 to receive the scattered light, photodiode 223's output signal is directly proportional with the scattered light intensity, utilize and be based on mie's theoretical algorithm, obtain the equivalent particle diameter of particulate matter and the particulate matter quantity of different particle diameters in the unit volume; the measured data is sent to an embedded display module 5 of the device for real-time display, and a wireless communication protocol and a wired communication interface are integrated in the device and can be linked with external equipment to perform ventilation and other operations.

Example 2

The embodiment 2 of the utility model provides a particulate matter sensor's control method, as shown in fig. 10, this control method includes following step:

s1, starting the particulate matter sensor, and detecting the content of the current particulate matter concentration in real time by the particulate matter concentration detection module 2;

s2, judging whether the content of the current particulate matter concentration is within a particulate matter concentration threshold value of a preset value, if not, executing S3, and if so, continuing to execute the current process;

and S3, when the preset value is exceeded, the control module 3 triggers an alarm module integrated in the control module (3) to alarm, and links an alarm signal with external equipment through a wireless communication protocol and/or a wired communication interface built in the control module 3 to ventilate, and transmits a gas concentration signal to the display module 5 to display.

The laser scattering principle of the utility model utilizes an algorithm based on the Mie theory to obtain the equivalent particle size of the particles and the number of the particles with different particle sizes in unit volume; displaying the currently measured concentration of the particulate matters on a built-in screen of the device; in addition, the user can select to start the sound-light alarm function, and when the concentration of the particulate matters reaches a set threshold value, the alarm function is triggered; the device is internally integrated with wireless and wired communication modes to communicate with external equipment.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a particulate matter sensor, its characterized in that places box body (1), particulate matter concentration detection module (2) and the control module (3) of seting up air inlet (11) in including, particulate matter concentration detection module (2) are connected with control module (3), still be provided with display module (5) on box body (1), display module (5) are connected with control module (3) for show the current particulate matter concentration content value that particulate matter concentration detection module (2) detected out.

2. The particle sensor according to claim 1, wherein the particle concentration detection module (2) comprises an upper cover body (21), an air passage component (22), a signal processing circuit board (23), a photodiode (24), a laser module (25), a micro fan (26) and a lower cover body (27), the upper cover body (21) is connected with the lower cover body (27), the air passage component (22) and the signal processing circuit board (23) are sequentially connected with each other from top to bottom, the photodiode (24) is arranged on one end face of the signal processing circuit board (23), and the laser module (25) and the micro fan (26) are arranged on the other end face of the signal processing circuit board (23).

3. The particulate matter sensor of claim 2, wherein the air channel assembly (22) comprises an air channel inlet (221), a laser module housing (222), a light trap (225), an air channel outlet (227) and an air channel housing (228), the air channel inlet (221) is arranged on one side of the air channel housing (228), the laser module housing (222) is arranged on one side of the air channel inlet (221), the light outlet end of the laser module housing (222) is provided with the light trap (225), the air channel outlet (227) is arranged below the laser module housing (222), and the position of the air channel outlet (227) corresponds to that of the micro fan (26).

4. The particle sensor according to claim 3, wherein the light-emitting end of the laser module housing (222) is provided with a lateral hole (223) and a lower hole (224), the lateral hole (223) is used for the laser module (25) to irradiate the air to be measured and generate scattered light when encountering the particles in the air to be measured, and the lower hole (224) is located above the photodiode (24) and is used for the scattered light emitted when the laser module housing (222) emits laser light to irradiate the particles in the air to reach the photodiode (24) through the lower hole (224).

5. A particle sensor according to claim 4, characterized in that the laser module (25) is a 650nm wavelength red laser module, a 520nm wavelength green laser module or a 450nm wavelength blue laser module, which comprises a metal housing (2221) and a built-in laser collimating lens (2222).

6. The particle sensor according to claim 5, wherein the signal processing circuit board (23) integrates a driving circuit for driving the micro fan and a signal filtering and amplifying circuit, the micro fan driving circuit provides a stable voltage for the micro fan through a voltage stabilizing chip, and the signal filtering and amplifying circuit comprises an operational amplifier which performs two-stage amplification on the weak electrical signal output by the photodiode (24) for facilitating subsequent signal processing.

7. A particle sensor as claimed in claim 6, characterised in that the cartridge (1) is further provided with a touch button (6) connected to the control module (3) for setting a particle concentration alarm value.