Dust particle counter with large measuring radius

Abstract

An embodiment of the utility model discloses a dust particle counter with a large measuring radius, which comprises a body, a microcontroller, a dust particle sensor, an airflow velocity sensor, an air pump and a large-air-volume turbine, an air inlet duct and an air outlet duct which are communicated with the outside of the body are arranged in the body, and the large-air-volume turbine is arranged between the air inlet duct and the air outlet duct. The large-air-volume turbine is used for discharging air in the air inlet duct into the air outlet duct, a detection air duct is arranged in the body, and an air suction opening of the detection air duct is formed in the side wall of the air inlet duct; an air outlet of the detection air passage is arranged on the body and is communicated with the outside of the body; the dust particle sensor, the airflow velocity sensor and the air pump are correspondingly arranged in the detection air passage; and the microcontroller is electrically connected with the large-air-volume turbine, the dust particle sensor, the airflow velocity sensor and the air pump. According to the utility model, the effective measurement radius of the small-flow dust particle sensor is increased, and even if the small-flow dust particle sensor is 28.3 L / min, the small-flow dust particle sensor can measure air in a large space range.

Description

Technical Field

[0001] The utility model relates to the technical field of dust particle detection, in particular to a dust particle counter with a large measurement radius. Background Art

[0002] A laser dust particle counter is an instrument used to measure the number of dust particles per unit volume and the particle size distribution in a clean environment. The common sampling flow rates of this instrument on the market are 2.83L / min, 28.3L / min, 50L / min, and 100L / min. Usually, this device is used in clean production workshops or scientific research departments, and its application range is very wide.

[0003] Under normal circumstances, the laser dust particle counter works intermittently and samples the air regularly. The device inhales a specified volume of air at a time and detects the values of dust particles such as 0.1um, 0.3um, 0.5um, 2.5um, 5.0um, and 10um, and classifies the purification workshop according to the values. There are currently 6 standard grades for purification workshops widely adopted in China, from high to low, namely grade 1, grade 10, grade 100, grade 1000, grade 10000, and grade 100000. The international standard ISO14644 divides the grades into a total of nine grades from class 1 to class 9. Whether it is the national standard or the international standard, the concentration of dust particles is one of the most important criteria for classifying workshop grades. The higher the grade standard, the more precise devices can be produced, etc. Therefore, the dust particle counter is an important monitoring product in a clean production workshop.

[0004] Existing dust particle counters have two air flow interfaces, one is the air suction port and the other is the air flow discharge port. The air flow rate of the dust particle counter is fixed. Currently, the common air flow rates on the market are two specifications: 2.83L / min and 28.3L / min. No matter which one, its air flow rate is not fast. Because its flow rate specification is fixed, dust particles can only inhale the air around the device, and the effective measurement radius range is relatively small. If the dust particle concentrations at different positions in the space are different, the measurement results cannot reflect the overall situation of the space. Summary of the Utility Model

[0005] The technical problem to be solved by the embodiments of the utility model is to provide a dust particle counter with a large measurement radius, so as to increase the effective measurement radius of the dust particle counter and improve the measurement effect of the product.

[0006] To solve the above technical problems, an embodiment of the present utility model provides a dust particle counter with a large measurement radius, which includes a main body, a microcontroller, and a dust particle sensor. It further includes an air flow velocity sensor, an air pump, and a large air volume turbine. An air inlet duct and an air outlet duct that communicate with the outside of the main body are provided inside the main body. The large air volume turbine is arranged between the air inlet duct and the air outlet duct and is used to discharge the gas in the air inlet duct into the air outlet duct. A detection air duct is provided inside the main body. The suction port of the detection air duct is arranged on the side wall of the air inlet duct; the air outlet of the detection air duct is arranged on the main body and communicates with the outside of the main body; the dust particle sensor, the air flow velocity sensor, and the air pump are correspondingly arranged in the detection air duct, and the microcontroller is electrically connected to the large air volume turbine, the dust particle sensor, the air flow velocity sensor, and the air pump.

[0007] Further, the diameters of the air inlet duct and the air outlet duct are larger than the diameter of the detection air duct.

[0008] Further, the microcontroller adopts an STM32F407 chip.

[0009] Further, the air flow velocity sensor adopts an air flow velocity sensor with the model number AFM3000.

[0010] Further, the dust particle sensor adopts a dust particle sensor with the model number PM5100.

[0011] The beneficial effects of the present utility model are as follows: The present utility model uses a large air volume turbine with a large suction force to suck air, and large-diameter air inlet and outlet ducts, which can suck the surrounding air into the middle of the device. Then, a small part of the air is diverted through the detection air duct in the large-diameter air inlet duct sucked by the large air volume turbine and is sucked by the air pump for sampling measurement. The present utility model increases the effective measurement radius of the small-flow dust particle sensor, and even a small-flow dust particle counter with a flow rate of 28.3 L / min can measure the air in a large space range. Description of the Drawings

[0012] Figure 1 is a structural schematic diagram of the dust particle counter with a large measurement radius according to an embodiment of the present utility model.

[0013] Figure 2 is a working flow chart of the dust particle counter with a large measurement radius according to an embodiment of the present utility model.

[0014] Description of the Reference Numerals in the Drawings

[0015] Main body 1, detection air duct 2, large air volume turbine 3. Detailed Embodiment

[0016] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The following further describes the present utility model in detail with reference to the drawings and specific embodiments.

[0017] In the embodiments of the present utility model, if there are directional indications (such as up, down, left, right, front, back...), they are only used to explain the relative position relationship and movement conditions between components in a certain specific posture (as shown in the drawings). If this specific posture changes, the directional indications will also change accordingly.

[0018] In addition, in the present utility model, the descriptions such as "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature.

[0019] Please refer to Figure 1 , the dust particle counter with a large measurement radius in the embodiments of the present utility model includes a body, a microcontroller, a dust particle sensor, an air flow velocity sensor, an air pump, and a large air volume turbine.

[0020] An air inlet duct and an air outlet duct that communicate with the outside of the body are provided inside the body. The large air volume turbine is arranged between the air inlet duct and the air outlet duct, and the large air volume turbine communicates with the air inlet duct and the air outlet duct. The large air volume turbine is used to discharge the gas in the air inlet duct into the air outlet duct.

[0021] A detection air duct is provided inside the body. The front end of the detection air duct is an air suction port, and the rear end is an air outlet. The air suction port of the detection air duct is arranged on the side wall of the air inlet duct. The air outlet of the detection air duct is arranged on the body and communicates with the outside of the body. The air inlet duct and the air outlet duct of the present utility model are relatively wide air ducts that can allow a large air volume to flow in. The air suction port of the detection air duct is connected to the air inlet duct, and a small part of the air flow is diverted from the air inlet duct for detection.

[0022] The dust particle sensor, the air flow velocity sensor, and the air pump are correspondingly arranged in the detection air duct, and the microcontroller is electrically connected to the large air volume turbine, the dust particle sensor, the air flow velocity sensor, and the air pump.

[0023] As an implementation manner, the diameters of the air inlet duct and the air outlet duct are larger than the diameter of the detection air duct.

[0024] The working process of the present utility model is as follows:

[0025] S1. The microcontroller drives the large air volume turbine, and the air flows into the air inlet duct and out of the air outlet duct;

[0026] S2. The microcontroller drives the air pump, and the air flows from the air inlet duct into the air suction port and enters the detection air duct.

[0027] S3. The microcontroller reads the value of the air flow velocity sensor;

[0028] S4. The microcontroller adjusts the speed of the air pump to stabilize the air flow velocity at a preset value;

[0029] S5. The microcontroller reads the value of the dust particle sensor;

[0030] S6. Keep working until the dust particle counter with a large measurement radius in the embodiment of the present utility model stops working after inhaling a specified capacity value.

[0031] Embodiment. The following case is a specific implementation scheme of a 28.3L / min capacity dust particle counter. The microcontroller uses an STM32F407 chip. The air flow velocity sensor uses an air flow velocity sensor with the model AFM3000. The dust particle sensor uses a dust particle sensor with the model PM5100. Please refer to Figure 2 , and the specific working process is as follows:

[0032] S1. The STM32F407 microcontroller drives a high-volume turbine, and a high volume of air flows into the air duct, and the surrounding air is sucked into the air duct;

[0033] S2. The STM32F407 microcontroller drives the air pump, and the air flows from the air inlet duct into the air suction port.

[0034] S3. The STM32F407 microcontroller reads the value of the air flow velocity sensor;

[0035] S4. The STM32F407 microcontroller adjusts the speed of the air pump to stabilize the air flow velocity at a specific value;

[0036] S5. The STM32F407 microcontroller reads the value of the dust particle sensor;

[0037] S6. Keep working until the device stops after inhaling 100L of capacity.

[0038] The present utility model can be widely applied to production enterprises and scientific research departments such as conventional clean production workshops, the electronics industry, pharmaceutical workshops, semiconductors, optical or precision machining, plastics, painting, hospitals, environmental protection, inspection institutes, blood centers, epidemic prevention stations, disease control centers, quality supervision institutes and other authoritative institutions.

[0039] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalent scope.

Claims

1. A dust particle counter with a large measurement radius, comprising a main body, a microcontroller, and a dust particle sensor, characterized in that, It also includes an air flow velocity sensor, an air pump and a large-volume turbine. An air inlet duct and an air outlet duct that communicate with the outside of the body are provided inside the body. The large-volume turbine is arranged between the air inlet duct and the air outlet duct. The large-volume turbine is used to discharge the gas in the air inlet duct into the air outlet duct. A detection air duct is provided inside the body. The suction port of the detection air duct is arranged on the side wall of the air inlet duct; the air outlet of the detection air duct is arranged on the body and communicates with the outside of the body; the dust particle sensor, the air flow velocity sensor and the air pump are correspondingly arranged in the detection air duct. The microcontroller is electrically connected to the large-volume turbine, the dust particle sensor, the air flow velocity sensor and the air pump.

2. The dust particle counter with a large measurement radius according to claim 1, wherein, The diameters of the air inlet duct and the air outlet duct are larger than the diameter of the detection air duct.

3. The dust particle counter with a large measurement radius according to claim 1, characterized in that, The microcontroller uses an STM32F407 chip.

4. The dust particle counter with a large measurement radius as described in claim 1, characterized in that, The air flow velocity sensor uses an air flow velocity sensor with the model number AFM3000.

5. The dust particle counter with a large measurement radius according to claim 1, wherein, The dust particle sensor uses a dust particle sensor with the model number PM5100.

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