CN219417377U - Portable formaldehyde, pm2.5 detector - Google Patents

Abstract

The utility model belongs to the technical field of air detection equipment, in particular to a portable formaldehyde and pm2.5 detector, which comprises a shell, wherein a circuit board is arranged in the shell, a main controller, a formaldehyde sensor, a pm2.5 sensor and a display are arranged on the circuit board, the formaldehyde sensor, the pm2.5 sensor and the display are electrically connected to the main controller, a formaldehyde sensor signal amplifying circuit is arranged on the circuit board, a DART formaldehyde sensor is electrically connected to the main controller on the circuit board through the formaldehyde sensor signal amplifying circuit, the detector is small and convenient to carry, the adopted DART formaldehyde sensor has higher resolution ratio to formaldehyde, is very sensitive, has no detection blind area in the concentration range of 0-1 ppm, can be used in occasions needing formaldehyde detection such as new formaldehyde detection and furniture formaldehyde detection, has higher detection precision and lower power consumption; the main controller adopts an arduino board card, so that the detector circuit is simple in design, high in stability and reliability and capable of meeting higher measurement requirements.

Description

Portable formaldehyde, pm2.5 detector

Technical Field

The utility model belongs to the technical field of air detection equipment, and particularly relates to a portable formaldehyde and pm2.5 detector.

Background

With the increasing demands of people on the quality of life, people are also more and more concerned about the air, water, food and living environment of the living places of people, for example, when people live in new houses just decorated, people often worry about whether the air quality of the new houses, such as formaldehyde, exceeds the standard, dust will not be much, and the like.

The main detection indexes of the indoor air are formaldehyde content and pm2.5 particle content, a household formaldehyde detector is adopted, a user can detect the indoor air at home, and the indoor air quality can be judged through air detection equipment. To achieve formaldehyde content of the air and air pm2.5 detection, an associated detection module must be included.

The existing household air detector has the problems of poor stability, limited measurement range and insufficient measurement precision, for example, the existing household formaldehyde detector adopts an MQ138 sensor to realize formaldehyde measurement, but the measurement range of the MQ138 sensor is 1 ppm-10 ppm, the lowest measurement value exceeds the minimum value of the national standard of 0.8ppm, and the MQ138 sensor has extremely non-ideal linearity, poor stability and low precision.

In the prior art, chinese patent document with publication number of CN217211734U describes an indoor environment formaldehyde detection device for constructional engineering, which comprises a device base, a shell, a detection box, a purification box, an exhaust fan, a liquid storage cylinder and an atomizing pump, wherein the detection box is arranged in the shell, and the purification box is arranged at the top of the detection box; the air outlet end of the exhaust fan is connected with the bottom of the detection box through a pipeline, and the top of the detection box is connected with the bottom of the purification box through a pipeline; the utility model discloses an exhaust fan, which is characterized in that a dust detector, a temperature and humidity detector and a formaldehyde detector are arranged in a detection box, air is pumped into the detection box by the exhaust fan, and is detected by the dust detector, the temperature and humidity detector and the formaldehyde detector respectively, measurement values are displayed by an intelligent display control panel, and functions of the formaldehyde detector and a purifier are combined together in practice, so that the detection precision is not improved.

Disclosure of Invention

The utility model aims to provide a portable formaldehyde and pm2.5 detector, which solves the technical problems that the minimum detection range of the instrument for detecting formaldehyde and pm2.5 air indexes in the prior art does not meet the national standard, the detection stability is poor and the precision is low.

In order to solve the technical problems, the utility model adopts the following technical scheme:

the utility model provides a portable formaldehyde, pm2.5 detector, including the casing be equipped with the circuit board in the casing, be equipped with main control unit, formaldehyde sensor, pm2.5 sensor and display on the circuit board, formaldehyde sensor, pm2.5 sensor and display electricity are connected to main control unit, be equipped with power module in the casing, formaldehyde sensor adopts DART formaldehyde sensor be equipped with formaldehyde sensor signal amplification circuit on the circuit board, DART formaldehyde sensor passes through formaldehyde sensor signal amplification circuit electricity is connected to main control unit.

Preferably, the pm2.5 sensor is a DSM501 sensor.

Preferably, the formaldehyde sensor signal amplifying circuit comprises an LTC1049 operational amplifier.

Preferably, the power module comprises a chargeable battery and a voltage conversion circuit, and a charging interface electrically connected to the chargeable battery is arranged on the shell.

Preferably, a main control switch is arranged on the shell, and the rechargeable battery is electrically connected to the voltage conversion circuit through the main control switch.

Preferably, the casing is provided with an air vent, the casing is internally provided with a ventilation fan, the casing is provided with a ventilation switch, and the ventilation fan is electrically connected to the power module through the ventilation switch.

Preferably, a debug interface electrically connected to the main controller is provided on the housing.

Preferably, the DART formaldehyde sensor is specifically a DART WZ-S-K formaldehyde sensor.

Preferably, the main controller is an arduino board card.

Compared with the prior art, the utility model has the beneficial effects that: the formaldehyde sensor in the portable formaldehyde/pm 2.5 detector adopts a DART formaldehyde sensor, a formaldehyde sensor signal amplifying circuit is arranged on a circuit board, the DART formaldehyde sensor is electrically connected to a main controller on the circuit board through the formaldehyde sensor signal amplifying circuit, and the detector is small and convenient to carry; the adopted DART formaldehyde sensor has higher resolution ratio to formaldehyde, is very sensitive, has no detection blind area when formaldehyde is in the concentration range of 0-1 ppm, can be used for detecting formaldehyde in new formaldehyde detection, furniture formaldehyde detection and other occasions needing formaldehyde detection, has higher detection precision and lower power consumption; the main controller adopts an arduino board card, so that the detector circuit is simple in design, high in stability and reliability and capable of meeting higher measurement requirements.

Drawings

The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the embodiments of the utility model, serve to explain the utility model. In the drawings:

FIG. 1 is a schematic perspective view of an embodiment of a portable formaldehyde, pm2.5 detector according to the present utility model.

FIG. 2 is a schematic diagram of a circuit board of an embodiment of the portable formaldehyde/pm 2.5 detector of the present utility model.

FIG. 3 is a block circuit diagram of one embodiment of the portable formaldehyde, pm2.5 detector of the present utility model.

In the drawings, each reference numeral is intended to: the device comprises a shell 1, a charging interface 11, a main control switch 12, an air vent 13, a debugging interface 14, a circuit board 2, a main controller 21, a formaldehyde sensor 22, a pm2.5 sensor 23, a display 24, a ventilator 25, a voltage conversion circuit 26, a formaldehyde sensor signal amplifying circuit 27 and a clock module 28.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In one embodiment, a portable formaldehyde, pm2.5 detector is provided, see fig. 1-3.

As shown in fig. 1 and 2, the portable formaldehyde, pm2.5 detector comprises a housing 1, a circuit board 2 is provided in the housing 1, a main controller 21, a formaldehyde sensor 22, a pm2.5 sensor 23 and a display 24 are provided on the circuit board 2, the formaldehyde sensor 22, the pm2.5 sensor 23 and the display 24 are all electrically connected to the main controller, wherein the formaldehyde sensor 22 is used for measuring formaldehyde concentration, the pm2.5 sensor 23 is used for measuring pm2.5 particle concentration, and the display 24 is used for displaying measured formaldehyde concentration value and pm2.5 particle concentration value.

As shown in fig. 3, a power module is provided in the casing 1, the power module includes a rechargeable battery and a voltage conversion circuit 26, wherein, a charging interface 11 electrically connected to the rechargeable battery is provided on the casing 1, the rechargeable battery is charged by adopting a charger to connect with the charging interface 11, the voltage conversion circuit 26 is used for converting the voltage output by the rechargeable battery into dc3.3v, DC5V and DC12V, dc3.3v and DC5V are used for supplying power to the main controller 21, the formaldehyde sensor 22, pm2.5 sensor 23 and the display 24, a ventilator 25 is provided in the casing 1, and dc12V is used for supplying power to the ventilator 25.

The two sides of the shell 1 are provided with ventilation holes 13, after the ventilation fan 25 in the shell 1 is started, the inside air convection is performed, the shell 1 is provided with a ventilation switch 13, the ventilation fan 25 is electrically connected to the DC12V output end of the voltage conversion circuit 26 of the power supply module through the ventilation switch 13, and the ventilation fan 25 can be started only when the ventilation switch 13 is closed.

In addition, as shown in fig. 1 and 2, a main control switch 12 is provided on the housing 1, and the rechargeable battery is electrically connected to a voltage conversion circuit 26 through the main control switch 12, and the detector is started when the main control switch 12 is turned on.

The formaldehyde sensor 22 is a DART formaldehyde sensor, in this embodiment, the DART formaldehyde sensor is specifically a DART WZ-S-K formaldehyde sensor, and the DART formaldehyde sensor is a DART formaldehyde sensor of the company Dart (DART) in British, and has stable linearity and sensitivity up to 0.01ppm although the price is twice that of the MQ138, and can meet the measurement national standard. The pm2.5 sensor is specifically a DSM501 sensor.

The main controller 21 adopted in the embodiment is an arduino board card, which not only has an ultra-high execution speed, but also is internally provided with 10-bit AD conversion, and can collect signals of two sensors, so that a circuit can be simplified, a certain cost can be saved, and the stability of the whole circuit is ensured; a debug interface 14 electrically connected to the main controller 21 is provided on the housing 1 for debugging the detector. As shown in fig. 2, a clock module 28, which is a DS1302 module, is provided on the circuit board 2 for providing a clock signal to the main controller 21.

As shown in fig. 2, a formaldehyde sensor signal amplifying circuit 27 is arranged on the circuit board 2, the DART formaldehyde sensor is electrically connected to the main controller 21 through the formaldehyde sensor signal amplifying circuit 27, the formaldehyde sensor signal amplifying circuit 27 amplifies the signal collected by the DART formaldehyde sensor and then transmits the amplified signal to the main controller 21, the formaldehyde sensor signal amplifying circuit 27 comprises an LTC1049 operational amplifier and a peripheral circuit thereof, the LTC1049 is a high-performance and low-power zero-shift operational amplifier, and the voltage shift of the LTC1049 amplifier is 0.02 [ mu ] V/° C, and the voltage shift is small due to the interference of external temperature; the input noise voltage variation from 0.1Hz to 10Hz is within 3 mu V, so that noise interference can be effectively restrained.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (9)

1. The utility model provides a portable formaldehyde, pm2.5 detector, includes the casing be equipped with the circuit board in the casing, be equipped with main control unit, formaldehyde sensor, pm2.5 sensor and display on the circuit board, formaldehyde sensor, pm2.5 sensor and display electricity are connected to main control unit, be equipped with power module in the casing, its characterized in that: the formaldehyde sensor adopts a DART formaldehyde sensor, a formaldehyde sensor signal amplifying circuit is arranged on the circuit board, and the DART formaldehyde sensor is electrically connected to the main controller through the formaldehyde sensor signal amplifying circuit.

2. The portable formaldehyde, pm2.5 detector according to claim 1, characterized in that: the pm2.5 sensor is a DSM501 sensor.

3. The portable formaldehyde, pm2.5 detector according to claim 1, characterized in that: the formaldehyde sensor signal amplifying circuit comprises an LTC1049 operational amplifier.

4. The portable formaldehyde, pm2.5 detector according to claim 1, characterized in that: the power module comprises a chargeable battery and a voltage conversion circuit, and a charging interface electrically connected to the chargeable battery is arranged on the shell.

5. The portable formaldehyde, pm2.5 detector according to claim 4, wherein: the shell is provided with a main control switch, and the rechargeable battery is electrically connected to the voltage conversion circuit through the main control switch.

6. The portable formaldehyde, pm2.5 detector according to claim 1, characterized in that: the shell is provided with an air vent, the shell is internally provided with a ventilation fan, the shell is provided with a ventilation switch, and the ventilation fan is electrically connected to the power module through the ventilation switch.

7. The portable formaldehyde, pm2.5 detector according to claim 1, characterized in that: a debug interface is provided on the housing and electrically connected to the main controller.

8. The portable formaldehyde, pm2.5 detector according to claim 1, characterized in that: the DART formaldehyde sensor is specifically a DART WZ-S-K formaldehyde sensor.

9. The portable formaldehyde, pm2.5 detector according to claim 1, characterized in that: the main controller is an arduino board card.