Venturi pumping type dust sensor

Abstract

The Venturi pumping type dust sensor comprises a lower cover, an upper cover, a pump cover, an air suction pipe, a dust suction pipe, an air pump, an air pump air outlet pipe, an air storage tank, a Venturi pipe, an air outlet pipe, a detection pipe, a laser head, a photoelectric tube, a circuit board, a connector and a pressure stabilizing valve. Air is filtered through the air suction pipe and then enters the air pump and the air pump air outlet pipe. And then voltage stabilization is carried out. And the gas enters the Venturi tube from the gas outlet tube after pressure stabilization. A dust suction pipe of the venturi pipe sucks environmental gas into the detection pipe. The laser head emits detection laser to irradiate environment gas in the detection tube, the environment gas reflects the laser to the photoelectric tube, and the photoelectric tube outputs a dust amount signal to the gas detector system for analysis and processing according to the intensity of the received laser. Air sucked by the air pump is filtered through the air suction pipe and then enters the air pump to be clean air, operation of the air pump is stabilized, and the service life of the sensor is prolonged. Air entering the detection pipe is detected after being subjected to pressure stabilization through the air storage tank and the pressure stabilizing valve, and the detection stability of the sensor is improved.

Description

(I) Technical field

[0001] The invention relates to the technical field of dust detection, and in particular to a Venturi pump suction type dust sensor. (II) Background technology

[0002] The existing dust sensor sampling gas flow control is determined by the fan wind speed. Since the fan wind speed has an error of 10% or 20%, and the long-term operation of the fan itself causes wear and aging, it will cause deviations in the flow value, thus affecting the accuracy of the final measurement value. This results in low detection accuracy of the dust sensor and inconsistent output results. This results in inaccurate detection results and a large deviation range of detection results.

[0003] In addition, both the air inlet and outlet form air flow channels through the gaps set on the metal shielding shell. The dust sensor must be placed inside the measured environment to monitor the dust concentration. When the measured environment is complex or a fully enclosed environment, the dust sensor cannot be placed therein and cannot be used normally.

[0004] Therefore, the prior art has the above defects. The patent application number is CN202122564404.1, entitled "A Dust Sensor", has made the following improvements:

[0005] This patent provides a dust sensor that can be used in conventional environments and complex and closed environments, making it widely applicable. The upper surface of the main frame is open, and a contoured concave-convex groove structure is formed in its inner cavity. Insertion channels are respectively provided on both sides of the main frame; a dust channel is provided in the laser probe bracket, and two laser probes are arranged and inserted on one side of the dust channel. The laser probes are arranged toward the dust channel, and the laser probe bracket is embedded in the concave-convex groove structure and arranged in the inner cavity of the main frame; the insertion channels on both sides are connected to the corresponding ends of the dust channel; two sections of pipe joints are respectively inserted in the corresponding insertion channels, and the outer ends of the pipe joints are respectively arranged with side convexities, and the inner ends of the two sections of pipe joints and the dust channel form a connecting channel; the PCB board cover is installed on the upper surface of the laser probe bracket and embedded in the inner cavity of the main frame, and the plug-in end of each laser probe is exposed and inserted into the corresponding slot of the PCB board. A pump is connected to the outer end of one of the pipe joints, and the other pipe joint is inserted into the environment to be detected. The pump is turned on to draw the dust into the dust channel, and the laser is emitted through the dual-path laser probe, and then detected and processed by the photosensitive chip.

[0006] This patent allows dust gas to directly enter the external pump, which can easily cause wear of the external pump, making it difficult for the sensor's fan speed to maintain consistency, and can also lead to inaccurate test results and a large deviation range in the test results.

[0007] The patent application number is CN202122564404.1, entitled "A Dust Sensor", which has made the following improvements:

[0008] This dust sensor includes a shell, which is formed by connecting an upper shell, a middle shell, and a lower shell in sequence, wherein the connection between the upper shell, the middle shell, and the lower shell is detachable, and the shell is provided with an air inlet and an air outlet; a laser emitter, which is installed in the shell and used to emit a laser to irradiate the airflow passing through the ventilation duct; a circuit board, which is arranged inside the shell, and a photoelectric detection sensor and an MCU are arranged on the circuit board, wherein the photoelectric detection sensor converts the light signal generated by the received laser irradiation on the particles in the airflow and scattering into an electrical signal and transmits it to the MCU, and the MCU processes the electrical signal to obtain the size, number, and concentration of the particles in the airflow. The sensor of the utility model has a simple and stable structure, high detection accuracy, and good consistency of detection results.

[0009] This patent keeps the fan speed consistent, so that the air flow speed in the dust detection chamber is constant, improving the detection accuracy and consistency of the detection results. However, when dust enters the air pump and causes wear, it is difficult to ensure the constant air flow speed.

[0010] Therefore, it is necessary to develop a Venturi pump suction dust sensor which can separate clean gas and dust gas, prevent dust from entering the air pump, and detect stable gas flow. (III) Summary of the invention

[0011] The purpose of the present invention is to provide a Venturi pump suction type dust sensor, which can separate clean gas and dust gas, prevent dust from entering the air pump, and ensure stable flow of detected gas.

[0012] To achieve the above-mentioned purpose, the Venturi pump suction dust sensor proposed in the present invention includes a lower cover, an upper cover, a pump cover, an air suction pipe, a dust suction pipe, an air pump, an air pump outlet pipe, an air storage tank, a Venturi tube, an outlet pipe, a detection tube, a laser head, a photoelectric tube, a circuit board, an interface, and a pressure regulating valve;

[0013] The other end of the diaphragm pump air inlet pipe is connected to the filter valve; the diaphragm pump air outlet pipe is connected to the gas storage tank; the other end of the gas storage tank is the gas tank outlet pipe, and the other end of the gas tank outlet pipe crosses the circuit board to connect to the air chamber; a gas sensor is installed on the circuit board and between the air chambers;

[0014] The lower cover and the upper cover are buckled together to form a sensor cavity, and the pump cover is fixed to the lower cover by screws; the pump cover is provided with holes for passing the air suction pipe and the dust suction pipe; under the pump cover are an air pump, an air pump outlet pipe, an air storage tank, a venturi tube, and an outlet pipe;

[0015] One end of the venturi tube is connected to the air outlet pipe, the other end is connected to the detection tube, and the middle is connected to the dust suction pipe; facing the detection tube are a laser head and a photoelectric tube, the laser head and the photoelectric tube are installed on a circuit board, and the external interface of the circuit board is an interface; the pressure regulating valve is installed at one end of the air outlet pipe of the gas tank; the external interface of the circuit board opens at the bottom of the lower cover.

[0016] Compared with the prior art, the invention has the following beneficial effects: clean gas and dusty gas are separated, and dust does not enter the air pump. The air sucked by the air pump enters through the air intake pipe after being filtered, which is clean air, and the service life of the air pump and the sensor is increased. The air entering the venturi tube and the detection tube is stabilized by the air storage tank and the pressure regulating valve, and the air pressure is stable, which can significantly improve the detection stability of the sensor. (IV) Description of the drawings

[0017] The specific structure of the present invention is given by the following embodiments and the accompanying drawings:

[0018] Attached Figure 1 It is an axonometric view of the Venturi pump suction type dust sensor of the present invention.

[0019] Attached Figure 2 It is an axial view of a hidden pump cover of a Venturi pump suction type dust sensor of the present invention.

[0020] Attached Figure 3 It is an axial view of a hidden pump plate and an upper cover of a venturi pump suction type dust sensor of the present invention.

[0021] Attached Figure 4 It is an axonometric cross-sectional view of the Venturi pump suction type dust sensor of the present invention.

[0022] Attached Figure 5 It is a bottom isometric view of the Venturi pump suction type dust sensor of the present invention.

[0023] The components include: (1) a lower cover, (2) an upper cover, (3) a pump cover, (4) an air suction pipe, (5) a dust suction pipe, (6) an air pump, (7) an air pump outlet pipe, (8) an air storage tank, (9) a venturi tube, (10) an outlet pipe, (11) a detection tube, (12) a laser head, (13) a photoelectric tube, (14) a circuit board, (15) an interface, and (16) a pressure regulating valve. (V) Specific implementation methods

[0024] See attached Figure 1 The lower cover (1) and the upper cover (2) are buckled together to form a sensor cavity, and the pump cover (3) is fixed to the lower cover (1) by screws; the pump cover (3) is provided with holes for passing the air suction pipe (4) and the dust suction pipe (5).

[0025] See attached Figure 2An air pump (6), an air pump air outlet pipe (7), an air storage tank (8), a venturi tube (9) and an air outlet pipe (10) are arranged below the pump cover (3).

[0026] See attached Figure 3 : One end of the venturi tube (9) is connected to the air outlet pipe (10), the other end is connected to the detection tube (11), and the middle is connected to the dust suction pipe (5); a laser head (12) and a photoelectric tube (13) are arranged opposite to the detection tube (11), and the laser head (12) and the photoelectric tube (13) are installed on a circuit board (14), and the external interface of the circuit board (14) is an interface (15).

[0027] See attached Figure 4 : The pressure stabilizing valve (16) is installed at one end of the gas outlet pipe (10) of the gas storage tank (8).

[0028] See attached Figure 5 : The external connection interface (15) of the circuit board (14) is opened below the lower cover (1).

[0029] According to the attached Figure 3 , Attachment Figure 4 As shown, and according to the principle diagram and circuit diagram of the dust sensor, mount the circuit board (14). Install each component and install it in the gas detector, and perform the following operations:

[0030] The interface (15) is connected to the power supply and control signal, the motor of the air pump (6) rotates, and the air enters the air pump (6) and the air pump outlet pipe (7) after being filtered through the air intake pipe (4). Then, the air enters the air storage tank (8) for pressure stabilization. After the gas is stabilized by the pressure regulating valve (16), it enters the venturi tube (9) through the outlet pipe (10). Due to the Venturi effect, the dust suction pipe (5) of the venturi tube (9) sucks the ambient gas into the detection tube (11). The laser head (12) emits a detection laser, which irradiates the dust gas in the detection tube (11). The dust gas reflects the laser to the photoelectric tube (13). The photoelectric tube (13) outputs a dust quantity signal according to the intensity of the received laser, and sends it to the gas detector system for analysis and processing through the interface (15).

[0031] The present invention has the following characteristics: the air sucked by the air pump (6) enters through the air intake pipe (4) after being filtered, and is clean air, thereby increasing the service life of the air pump (6) sensor. The air entering the venturi tube (9) and the detection tube (11) is detected after being stabilized by the air storage tank (8) and the pressure regulating valve (16), thereby improving the detection stability of the sensor.

Claims

1. A Venturi pump suction dust sensor, characterized in that Venturi pump suction dust sensors are: A lower cover (1), an upper cover (2), a pump cover (3), an air suction pipe (4), a dust suction pipe (5), an air pump (6), an air pump outlet pipe (7), an air storage tank (8), a venturi tube (9), an air outlet pipe (10), a detection tube (11), a laser head (12), a photoelectric tube (13), a circuit board (14), an interface (15), and a pressure regulating valve (16).

2. The Venturi pump suction dust sensor according to claim 1, characterized in that: The lower cover (1) and the upper cover (2) are buckled together to form a sensor cavity, and the pump cover (3) is fixed to the lower cover (1) by screws.

3. The Venturi pump suction dust sensor according to claim 1, characterized in that: The pump cover (3) is provided with holes through which the air suction pipe (4) and the dust suction pipe (5) pass.

4. The Venturi pump suction dust sensor according to claim 1, characterized in that: An air pump (6), an air pump air outlet pipe (7), an air storage tank (8), a venturi tube (9) and an air outlet pipe (10) are arranged below the pump cover (3).

5. The Venturi pump suction dust sensor according to claim 1, characterized in that: One end of the venturi tube (9) is connected to the air outlet pipe (10), the other end is connected to the detection pipe (11), and the middle is connected to the dust suction pipe (5).

6. The Venturi pump suction dust sensor according to claim 1, characterized in that: Opposite to the detection tube (11) are a laser head (12) and a photoelectric tube (13), which are mounted on a circuit board (14), and the external interface of the circuit board (14) is an interface (15).

7. The Venturi pump suction dust sensor according to claim 1, characterized in that: The pressure stabilizing valve (16) is installed at one end of the gas outlet pipe (10) of the gas storage tank (8).

8. The Venturi pump suction dust sensor according to claim 1, characterized in that: The external connection interface (15) of the circuit board (14) opens below the lower cover (1).

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