Particle detecting module

Patent metadata

Field	Value
Publication number	US-11585745-B2
Application number	US-202017015823-A
Country	US
Kind code	B2
Filing date	Sep 9, 2020
Priority date	Sep 27, 2019
Publication date	Feb 21, 2023
Grant date	Feb 21, 2023

Abstract

A particle detecting module is provided and includes a base, a piezoelectric actuator, a driving circuit board, a laser component, a particulate sensor and an outer cover. A gas-guiding-component loading region and a laser loading region are separated by the base. By the design of the gas flowing path, the driving circuit board covering the bottom surface of the base, and the outer cover covering the surfaces of the base, an inlet path is defined by the gas inlet groove of the base, and an outlet path is defined by a gas outlet groove of the base. Consequently, the thickness of the particle detecting module is drastically reduced.

First claim

What is claimed is:

1. A particle detecting module, comprising:
a base comprising:
a first surface;
a second surface opposite to the first surface;
a laser loading region hollowed out from the first surface to the second surface;
a gas-inlet groove concavely formed from the second surface, disposed adjacent to the laser loading region and comprising a gas-inlet and a transparent window, wherein the gas-inlet is in communication with an environment outside the base, and the transparent window is disposed at a junction between the gas-inlet groove and the laser loading region;
a gas-guiding-component loading region concavely formed from the second surface and in communication with the gas-inlet groove, wherein a ventilation hole penetrates a bottom surface of the gas-guiding-component loading region; and
a gas-outlet groove concavely formed from the first surface, spatially corresponding to the bottom surface of the gas-guiding-component loading region, and hollowed out from the first surface to the second surface in a region where the first surface is not aligned with the gas-guiding-component loading region, wherein the gas-outlet groove is in communication with the ventilation hole, and a gas-outlet is disposed in the gas-outlet groove and in communication with the environment outside the base;
a piezoelectric actuator accommodated in the gas-guiding-component loading region;
a driving circuit board covering and attached to the second surface of the base;
a laser component positioned and disposed on the driving circuit board, electrically connected to the driving circuit board, and accommodated in the laser loading region, wherein a light beam path emitted from the laser component passes through the transparent window and extends in a direction perpendicular to the gas-inlet groove, thereby forming an orthogonal direction with the gas-inlet groove;
a particulate sensor positioned and disposed on the driving circuit board, electrically connected to the driving circuit board, and disposed at an orthogonal position where the gas-inlet groove intersects the light beam path of the laser component in the orthogonal direction, so that suspended particles passing through the gas-inlet groove and irradiated by a projecting light beam emitted from the laser component are detected; and
an outer cover covering the first surface of the base and comprising a side plate, wherein the side plate has an inlet opening spatially corresponding to the gas-inlet and an outlet opening spatially corresponding to the gas-outlet, respectively,
wherein the first surface of the base is covered with the outer cover, and the second surface of the base is covered with the driving circuit board, so that an inlet path is defined by the gas-inlet groove and an outlet path is defined by the gas-outlet groove, wherein the particle detecting module has a length ranging from 2 mm to 35 mm, a width ranging from 2 mm to 35 mm, and a thickness ranging from 1 mm to 6.5 mm, so that the gas is inhaled from the environment outside base by the piezoelectric actuator, transported into the inlet path defined by the gas-inlet groove through the inlet opening, and passes through the particulate sensor to detect a concentration of the suspended particles contained in the gas, and the gas transported through the piezoelectric actuator is transported out of the outlet path defined by the gas-outlet groove through the ventilation hole and then discharged through the outlet opening,
wherein the base comprises a light trapping region hollowed out from the first surface to the second surface and spatially corresponding to the laser loading region, wherein the light trapping region comprises a light trapping structure having an oblique cone surface and spatially corresponding to the light beam path.

2. The particle detecting module according to claim 1 , wherein the gas-guiding-component loading region has four positioning notches disposed at four corners of the gas-guiding-component loading region for embedding and positioning the piezoelectric actuator.

3. The particle detecting module according to claim 1 , wherein a light trapping distance is maintained between the transparent window and a position where the light trapping structure receives the projecting light beam.

4. The particle detecting module according to claim 3 , wherein the light trapping distance is greater than 3 mm.

5. The particle detecting module according to claim 1 , wherein the particulate sensor is a PM2.5 sensor.

6. The particle detecting module according to claim 1 , wherein the piezoelectric actuator comprises:
a gas-injection plate comprising a plurality of connecting elements, a suspension plate and a hollow aperture, wherein the plurality of connecting elements are connected to and adjacent to the periphery of the suspension plate, the suspension plate is permitted to undergo a bending deformation, and the hollow aperture is formed at a center of the suspension plate, wherein the suspension plate is fastened through and elastically supported by the plurality of connecting elements, a flowing chamber is formed between the gas-injection plate and the bottom surface of the gas-guiding-component loading region, and at least one vacant is formed between the plurality of connecting elements and the suspension plate;
a chamber frame carried and stacked on the suspension plate;
an actuator element carried and stacked on the chamber frame for being driven in response to an applied voltage to undergo the bending deformation in a reciprocating manner;
an insulation frame carried and stacked on the actuator element; and
a conductive frame carried and stacked on the insulation frame,
wherein a resonance chamber is formed among the actuator element, the chamber frame and the suspension plate, wherein when the actuator element is enabled to drive the gas-injection plate to move in resonance, the suspension plate of the gas-injection plate is driven to generate the bending deformation in the reciprocating manner, the gas flows through the vacant space, enters the flowing chamber, and is discharged out, so as to achieve gas transportation.

7. The particle detecting module according to claim 6 , wherein the actuator element comprises:
a piezoelectric carrying plate carried and stacked on the chamber frame;
an adjusting resonance plate carried and stacked on the piezoelectric carrying plate; and
a piezoelectric plate carried and stacked on the adjusting resonance plate, wherein the piezoelectric plate is configured to drive the piezoelectric carrying plate and the adjusting resonance plate to generate the bending deformation in the reciprocating manner by the applied voltage.

8. The particle detecting module according to claim 1 , further comprising a first volatile-organic-compound sensor positioned and disposed on the driving circuit board, electrically connected to the driving circuit board, and accommodated in the gas-outlet groove, so as to detect the gas flowing through the outlet path of the gas-outlet groove.

9. The particle detecting module according to claim 1 , further comprising a second volatile-organic-compound sensor positioned and disposed on the driving circuit board, electrically connected to the driving circuit board, and accommodated in the light trapping region, so as to detect the gas flowing through the inlet path of the gas-inlet groove and transported into the light trapping region through the transparent window.

10. The particle detecting module according to claim 1 , wherein the particle detecting module has a length ranging from 10 mm to 20 mm, a width ranging from 10 mm to 20 mm, and a thickness ranging from 1 mm to 3.5 mm.

11. The particle detectin

Assignees

• Microjet Technology Co Ltd

Inventors

• Mou Hao-Jan
• Han Yung-Lung
• Huang Chi-Feng
• Lee Wei-Ming
• Kuo Chun-Yi
• Ku Yang
• Tsai Chang-Yen

Classifications

• G01N2015/0046

  in gas, e.g. smoke · CPC title

• G01N33/0047

  Organic compounds · CPC title

• G01N15/1484

  microstructural devices · CPC title

• G01N15/06

  Investigating concentration of particle suspensions (by weighing G01N5/00; investigating sedimentation of particle suspensions G01N15/04; investigating individual particles G01N15/10) · CPC title

• G01N1/24

  Suction devices {(G01N1/22 - G01N1/2294 take precedence)} · CPC title