Constant-current dust sampler

Abstract

The utility model discloses a constant current dust sampler, relates to dust sampler technical field, including the mounting bracket, circuit board and second frame body that sets up in the left and right, vacuum pump body surface is equipped with sampling hose, flow sampling pipe and air outlet pipe in proper order, circuit board back is fixedly equipped with pressure sensor, the second frame body is equipped with pressure sensor. The switch button is turned on to electrify the touch screen, the brushless motor is controlled to rotate through the touch screen, air is sucked out of the vacuum pump body and discharged through the air outlet pipe, negative pressure is formed in the vacuum pump body, and the air and dust are sucked into the sampler from the sampling hose under the action of the negative pressure. When the brushless motor works, air is discharged from the flow sampling pipe, the pressure sensor is used for detecting the pressure discharged from the flow sampling pipe, the pressure is larger than a set value, the rotating speed of the brushless motor is reduced, the pressure is smaller than the set value, the rotating speed of the brushless motor is increased, and therefore the flow speed is kept stable during sampling, and errors are reduced.

Description

Technical Field

[0001] This utility model relates to the field of dust sampler technology, specifically a constant current dust sampler. Background Technology

[0002] A dust sampler is a portable device used to collect dust samples from dusty air. Measuring the concentration of dust in the air is necessary not only for safety management but also to provide a scientific basis for researching dust prevention, reduction, and removal measures. Using a sampler to measure dust is a widely recognized method with high accuracy. It is widely used in disease prevention, environmental monitoring, occupational safety, work safety supervision, military, scientific research and teaching, metallurgy, petrochemicals, railways, building materials, and other sectors for hygiene monitoring and evaluation, and is specifically used to determine the average dust concentration in the air within production work areas.

[0003] A search of existing published patents revealed that, according to patent number CN202420301900.9, entitled "A Portable Dust Sampler," the dust sampler includes a main unit and a sampling component mounted on it. Two connecting frames are symmetrically mounted on the left end of the main unit. Each connecting frame consists of a mounting base and a connecting plate, with the connecting plate mounted on the outer end of the mounting base. A fixing component is mounted on each of the two connecting frames. This fixing component consists of an arc-shaped fixing plate, mounting rods, springs, and baffles. Four mounting rods are symmetrically mounted on the inner end of the arc-shaped fixing plate, and four springs are respectively fitted onto the four mounting rods. By providing connecting frames, fixing components, and insert brackets on the dust sampler main unit, the sampling component can be fixed to these components after use, thus integrating the main unit and the sampling component into one unit. This makes the dust sampler more portable and ultimately improves its portability.

[0004] However, when the above sampler is used, the sampling range is fixed and small, and the flow rate is not constant during sampling. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this invention provides a constant flow dust sampler that solves the problems of fixed sampling range, small sampling range, and insufficiently constant flow rate during sampling.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: a constant current dust sampler, comprising: a mounting bracket arranged on the left, right, and center; a circuit board; and a second frame. A vacuum pump body is fixedly mounted on the mounting bracket. A brushless motor is fixedly mounted at the center of the surface of the vacuum pump body. A sampling hose, a flow sampling tube, and an outlet tube are sequentially arranged on the surface of the vacuum pump body. A pressure sensor is fixedly mounted on the back of the circuit board. One end of the flow sampling tube is inserted into the surface of the pressure sensor. The circuit board is electrically connected to the brushless motor. A charging port electrically connected to the circuit board is provided on the second frame. A touch screen is fixedly connected at the center of the side of the circuit board away from the pressure sensor. A switch button electrically connected to the circuit board is fixedly connected to the surface of the mounting bracket.

[0009] Preferably, a breathing indicator light is fixedly connected to the side of the circuit board near the touch screen above the touch screen, and a buzzer is fixedly connected to the side of the circuit board near the touch screen below the touch screen.

[0010] Preferably, the circuit board is electrically connected to a USB interface, and a pressure sensor is fixedly connected to the side of the circuit board near the pressure sensor.

[0011] Preferably, a 4G module, a temperature detection probe, and a load pressure sensor are fixedly connected to the side of the circuit board near the pressure sensor, and the 4G module, the temperature detection probe, and the load pressure sensor are all electrically connected to the circuit board.

[0012] Preferably, a battery electrically connected to a circuit board is fixedly connected to the second frame.

[0013] Preferably, the circuit board is electrically connected to the breathing indicator light and the buzzer, respectively.

[0014] Beneficial effects

[0015] This invention provides a constant current dust sampler, which has at least the following advantages compared with the prior art:

[0016] Turning on the power button supplies power to the touchscreen, which controls the brushless motor's rotation. This draws air from the vacuum pump body and discharges it through the outlet pipe, creating negative pressure within the pump. This negative pressure forces air and dust into the sampler through the sampling hose. While the brushless motor is operating, air is discharged from the flow sampling tube. A pressure sensor monitors the pressure discharged from the flow sampling tube. If the pressure is higher than the set value, the brushless motor speed is reduced; if the pressure is lower, the speed is increased, thus maintaining a stable flow rate during sampling and reducing errors. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model from below;

[0018] Figure 2 This is a schematic diagram of the structure of this utility model;

[0019] Figure 3 This is a top view of the structure of this utility model.

[0020] In the diagram: 1. Mounting bracket; 2. Vacuum pump body; 3. Brushless motor; 4. Sampling hose; 5. Outlet pipe; 6. Flow sampling pipe; 7. Charging port; 8. Circuit board; 9. Pressure sensor; 10. Touch screen; 11. USB interface; 12. Second frame; 14. 4G module; 15. Temperature detection probe; 16. Load pressure sensor; 17. Air pressure sensor; 18. Battery; 19. Switch button. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Example 1:

[0023] Please see Figure 1-3 This utility model provides a technical solution: a mounting bracket 1, a circuit board 8, and a second frame 12 are arranged in the left and right sides. A vacuum pump body 2 is fixedly mounted on the mounting bracket 1. A brushless motor 3 is fixedly mounted at the center of the surface of the vacuum pump body 2. A sampling hose 4, a flow sampling tube 6, and an exhaust tube 5 are arranged sequentially on the surface of the vacuum pump body 2. A pressure sensor 9 is fixedly mounted on the back of the circuit board 8. One end of the flow sampling tube 6 is inserted into the surface of the pressure sensor 9. The circuit board 8 is electrically connected to the brushless motor 3. A charging port 7 electrically connected to the circuit board 8 is provided on the second frame 12. A touch screen 10 is fixedly connected at the center of the side of the circuit board 8 away from the pressure sensor 9. A switch button 19 electrically connected to the circuit board 8 is fixedly connected to the surface of the mounting bracket 1. A USB interface 11 is electrically connected to the circuit board 8. A pressure sensor 17 is fixedly connected to the side of the circuit board 8 closer to the pressure sensor 9.

[0024] Analysis of the above: Turning on switch button 19 powers on touchscreen 10, which in turn controls the rotation of brushless motor 3. This draws air from vacuum pump body 2 and discharges it through outlet pipe 5, creating negative pressure in vacuum pump body 2. Under this negative pressure, air and dust are drawn into the sampler from sampling hose 4. While brushless motor 3 is operating, air is discharged from flow sampling tube 6. Pressure sensor 9 detects the pressure discharged from flow sampling tube 6. If the pressure is higher than the set value, the speed of brushless motor 3 is reduced; if the pressure is lower than the set value, the speed of brushless motor 3 is increased, thus maintaining a stable flow rate during sampling and reducing errors. Sampling data is exported via USB interface 11.

[0025] Example 2:

[0026] Please see Figure 1-3 This utility model provides a technical solution based on Embodiment 1: A breathing indicator light is fixedly connected to the side of the circuit board 8 near the touch screen 10, above the touch screen 10. A buzzer (not shown in the figure) is fixedly connected to the lower part of the side of the circuit board 8 near the touch screen 10. A 4G module 14, a temperature detection probe 15, and a load pressure sensor 16 are fixedly connected to the side of the circuit board 8 near the pressure sensor 9, and all three are electrically connected to the circuit board 8. A battery 18, electrically connected to the circuit board 8, is fixedly connected to the second frame 12. The circuit board 8 is electrically connected to the breathing indicator light and the buzzer.

[0027] Analysis of the above: A breathing indicator light is used to indicate the current status. During sampling, the breathing indicator light illuminates; after sampling is complete, the green light illuminates; if an error occurs, the red light illuminates; and a buzzer sounds after sampling is complete. Ambient temperature is collected via temperature probe 15, and current air pressure data is collected via air pressure sensor 17. A battery 18 is provided to power the device, which can be powered by a wired connection or wirelessly, making it convenient to carry and use.

[0028] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0029] Although embodiments of the present invention 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 to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A constant current dust sampler, characterized in that, include: The mounting bracket (1), circuit board (8), and second frame (12) are arranged on the left and right sides. A vacuum pump body (2) is fixedly mounted on the mounting bracket (1). A brushless motor (3) is fixedly mounted on the center of the surface of the vacuum pump body (2). A sampling hose (4), a flow sampling tube (6), and an exhaust pipe (5) are arranged sequentially on the surface of the vacuum pump body (2). A pressure sensor (9) is fixedly mounted on the back of the circuit board (8). One end of the flow sampling tube (6) is inserted into the surface of the pressure sensor (9). The circuit board (8) is electrically connected to the brushless motor (3). A charging port (7) electrically connected to the circuit board (8) is provided on the second frame (12). A touch screen (10) is fixedly connected in the center of the side of the circuit board (8) away from the pressure sensor (9). A switch button (19) electrically connected to the circuit board (8) is fixedly connected to the surface of the mounting bracket (1).

2. The constant current dust sampler according to claim 1, characterized in that: A breathing indicator light is fixedly connected to the side of the circuit board (8) near the touch screen (10) above the touch screen (10), and a buzzer is fixedly connected to the side of the circuit board (8) near the touch screen (10) at a lower position.

3. The constant current dust sampler according to claim 1, characterized in that: The circuit board (8) is electrically connected to a USB interface (11), and a pressure sensor (17) is fixedly connected to the side of the circuit board (8) near the pressure sensor (9).

4. A constant current dust sampler according to claim 3, characterized in that: The circuit board (8) is fixedly connected to the side of the pressure sensor (9) with a 4G module (14), a temperature detection probe (15) and a load pressure sensor (16), and the 4G module (14), the temperature detection probe (15) and the load pressure sensor (16) are all electrically connected to the circuit board (8).

5. A constant current dust sampler according to claim 1, characterized in that: A battery (18) that is electrically connected to a circuit board (8) is fixedly connected to the second frame (12).

6. A constant current dust sampler according to claim 2, characterized in that: The circuit board (8) is electrically connected to the breathing indicator and the buzzer, respectively.

Images