Multi-particle-size-switchable on-line detector for atmospheric particulate matter

Abstract

The utility model provides the on -line detection appearance of atmospheric particulate matter of many particle sizes can switch, relates to particulate matter monitoring technical field, including detector body, sampling pipe, sampling head and rotating mechanism, sampling pipe rotatable fixed in the detector body, rotating mechanism can drive sampling pipe rotates in the sampling channel, sampling head includes first holder and second holder, second holder rotatable fixed in first holder downside, second holder upper end is provided with baffle, baffle includes a plurality of sectors, different sector is provided with the flow guide hole of different diameter on, second holder and sampling pipe upper end coaxial communication fixed, first holder and detector body fixed, the on -line detection appearance of atmospheric particulate matter of many particle sizes can switch provided by the utility model, solved the problem of long maintenance period of sampling head of switchable collection particle size in the prior art, can prolong the maintenance period of particulate matter on -line monitoring equipment, alleviate the work load of staff.

Description

Technical Field

[0001] This utility model relates to the field of particulate matter monitoring technology, and in particular to an online atmospheric particulate matter detector capable of switching between multiple particle sizes. Background Technology

[0002] An online atmospheric particulate matter detector is a device that can collect particulate matter of different sizes in the atmosphere and generate analysis data on the concentration of different particulate matter.

[0003] When collecting particulate matter from an online atmospheric particulate matter detector, different sampling heads are used. However, for some locations with low sampling frequencies, equipping an online atmospheric particulate matter detector with multiple sampling heads for different particle sizes is costly.

[0004] To enable a single sampling head to collect particles of different sizes, existing technologies include a sampling head for an online atmospheric particulate matter detector, as disclosed in Chinese Patent Application No. 202421223540.1. Essentially, this head works by rotating a baffle, aligning the fan-shaped ventilation holes on the baffle with sectors having different permeability, thus adapting to the collection of particles of different sizes. However, the mechanism driving the rotation is a motor located inside the sampling head, which is battery-powered. When the power is depleted, it needs to be manually replaced on-site, resulting in a large maintenance workload. Furthermore, due to the sealing requirements of the sampling head, the built-in motor cannot be directly connected to the control module of the detector's main unit via a control cable; it can only be driven by an independent battery-powered control unit. This leads to poor motor rotation control accuracy and a tendency for sampling to occur before the guide holes and airflow channels are aligned. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model provides an online atmospheric particulate matter detector with multi-size switching capability.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides an online atmospheric particulate matter detector with multi-size switching capability, comprising a detector body, a sampling tube, a sampling head, and a rotating mechanism. The detector body has a sampling channel. The sampling tube is coaxially and rotatably fixed within the sampling channel. The outer wall of the sampling tube is sealed to the sampling channel. The rotating mechanism is located within the detector body and can drive the sampling tube to rotate within the sampling channel. The sampling head includes a first clamp and a second clamp. The first clamp has an air inlet at its top and a cylindrical recess at its bottom. The first clamp is a cylindrical groove; the air inlet is connected to the cylindrical groove; the air inlet is fan-shaped; the second clamp is a cylindrical tube; the upper end of the second clamp is coaxially and rotatably fixed in the cylindrical groove; a baffle is provided at the upper end of the second clamp; the baffle includes multiple sectors; the shape of the sector is the same as the shape of the air inlet; different sectors are provided with guide holes of different diameters; the guide holes in the same sector have the same diameter; the lower end of the cylindrical tube of the second clamp is coaxially connected and fixed to the upper end of the sampling tube; the bottom of the first clamp is fixed to the detector body.

[0007] The online atmospheric particulate matter detector with multi-size switching capability provided by this utility model preferably further includes an identification sensor and a control device; a plurality of identification marks are provided on the side wall of the sampling tube; the identification marks are equidistantly distributed circumferentially on the side wall of the sampling tube; the identification marks correspond to each sector on the baffle; the identification sensor is disposed inside the detector body; the control device is electrically connected to the identification sensor; the rotating mechanism is electrically connected to the control device.

[0008] The present invention provides an online atmospheric particulate matter detector with multiple particle size switching capabilities. Preferably, the rotating mechanism includes a motor, a drive gear, and a driven gear; the driven gear is coaxially fixed to the outer wall of the sampling tube; the drive gear is coaxially fixed to the output shaft of the motor; and the driven gear meshes with the drive gear.

[0009] The online atmospheric particulate matter detector with multi-size switching capability provided by this utility model preferably uses a photoelectric sensor as the identification sensor and a reflective patch as the identification mark.

[0010] The above technical solution has the following advantages or beneficial effects: This utility model provides an online atmospheric particulate matter detector with multi-size switching capability, relating to the field of particulate matter monitoring technology. It includes a detector body, a sampling tube, a sampling head, and a rotating mechanism. The detector body has a sampling channel. The sampling tube is coaxially and rotatably fixed within the sampling channel. The outer wall of the sampling tube is sealed to the sampling channel. The rotating mechanism is located within the detector body and can drive the sampling tube to rotate within the sampling channel. The sampling head includes a first clamp and a second clamp. The first clamp has an air inlet at its top and a bottom portion... The device comprises a cylindrical groove; an air inlet connected to the cylindrical groove; the air inlet is fan-shaped; a second clamp is tubular; the upper end of the second clamp is coaxially and rotatably fixed within the cylindrical groove; a baffle is provided at the upper end of the second clamp; the baffle includes multiple sectors; the shape of each sector is the same as the shape of the air inlet; different sectors have guide holes of different diameters; the guide holes in the same sector have the same diameter; the lower end of the tubular particulate matter of the second clamp is coaxially connected and fixed to the upper end of the sampling tube; the bottom of the first clamp is fixed to the detector body. This utility model provides an online atmospheric particulate matter detector with multi-particle-size switching capability, solving the problem of long maintenance cycles for existing sampling heads with switchable particle sizes, extending the maintenance cycle of online particulate matter monitoring equipment, and reducing the workload of staff. Attached Figure Description

[0011] The present invention, its features, shape, and advantages will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Like reference numerals denote like parts throughout the drawings. The drawings are not intentionally drawn to scale; the focus is on illustrating the gist of the invention.

[0012] Figure 1 This is a cross-sectional structural schematic diagram of the online atmospheric particulate matter detector with multi-size switching capability provided in Embodiment 1 of this utility model.

[0013] Figure 2 This is a schematic diagram of the air inlet position of the online atmospheric particulate matter detector with multi-size switching capability provided in Embodiment 1 of this utility model.

[0014] Figure 3 This is a schematic diagram of the guide hole position of the online atmospheric particulate matter detector with multi-size switching capability provided in Embodiment 1 of this utility model.

[0015] Figure 4 This is a schematic diagram of the circuit connection frame of the online atmospheric particulate matter detector with multi-size switching provided in Embodiment 1 of this utility model. Detailed Implementation

[0016] Example 1: The online atmospheric particulate matter detector with multi-size switching capability provided in Embodiment 1 of this utility model, such as... Figures 1 to 4 As shown, the device includes a detector body 1, a sampling tube 2, and a sampling head 3; its key feature is that it also includes a rotating mechanism 4; the detector body 1 has a sampling channel 11; the sampling tube 2 is coaxially and rotatably fixed within the sampling channel 11; the outer wall of the sampling tube 2 is sealed to the inner wall of the sampling channel 11; the rotating mechanism 4 is disposed within the detector body 1; the rotating mechanism 4 can drive the sampling tube 2 to rotate within the sampling channel 11 (with the tube axis of the sampling tube 2 as the axis of rotation); the sampling head 3 includes a first clamp 31 and a second clamp 32; the first clamp 31 has an air inlet 311 at its top; the first clamp 31 has a cylindrical part at its bottom. The first clamp 31 has a cylindrical groove; the air inlet 311 is connected to the cylindrical groove; the air inlet 311 is fan-shaped; the second clamp 32 is a cylindrical tube; the upper end of the second clamp 32 is coaxially and rotatably fixed in the cylindrical groove; a baffle 321 is provided at the upper end of the second clamp 32; the baffle 321 includes multiple sectors; the shape of the sectors is the same as the shape of the air inlet 311; different sectors are provided with guide holes 3211 of different diameters; the guide holes 3211 on the same sector have the same diameter; the lower end of the cylindrical tube of the second clamp 32 is coaxially connected and fixed to the upper end of the sampling tube 2; the bottom of the first clamp 31 is sealed and fixed to the outer shell of the detector body 1.

[0017] In the use of the multi-size switching atmospheric particulate matter online detector provided in Embodiment 1 of this utility model, particulate matter in the atmosphere enters the fan-shaped air inlet 311 at the top of the first clamp 31 of the sampling head 3 with the airflow (specifically, a filter membrane clamp is set between the suction pump in the detector body 1 and the lower end of the sampling tube 2. When the suction pump draws air, the air enters from the sampling head 3 and passes through the filter membrane clamp, and the particulate matter falls on the filter membrane fixed by the filter membrane clamp to complete the collection). When it is necessary to collect particulate matter of different sizes, the rotation mechanism 4 set in the detector body 1 is activated. The rotation mechanism 4 outputs power to drive the sampling tube 2 to rotate around its own cylindrical tube axis in the sampling channel 11. Since the lower end of the cylindrical tube of the second clamp 32 is coaxially connected and fixed to the upper end of the sampling tube 2, and the upper end of the second clamp 32 is coaxially rotatably fixed in the cylindrical groove of the first clamp 31, the rotation of the sampling tube 2 will synchronously drive the second clamp 32 and the particulate matter set on it. The baffle 321 at the end rotates together, thereby changing the position of different sectors on the baffle 321. As the second clamp 32 rotates, the target sector on the baffle 321 gradually approaches and eventually aligns with the fan-shaped air inlet 311 of the first clamp 31. At this time, the rotating mechanism 4 stops working. After alignment, particles in the airflow that meet the target particle size requirements enter the round tube of the second clamp 32 through the guide hole 3211 on the corresponding sector of the baffle 321, and are then transported downward along the internal channel of the sampling tube 2. Finally, they enter the preset filter membrane clamp inside the detector body 1 and are intercepted, thus completing the collection of particles of that particle size. If it is necessary to collect particles of other particle sizes, no parts need to be disassembled. It is only necessary to restart the rotating mechanism 4 and repeat the above process to switch the position of the sector formed by the guide hole 3211 of different diameters and the air inlet 311. The new particle size can be screened and collected through the guide hole 3211 of different diameters. Compared to the existing technology where the sampling head has a built-in motor, which requires a motor-driven cutter inside the sampling head, resulting in a crowded sampling head and the motor relying on battery power, requiring manual on-site replacement after the power is depleted, causing cumbersome maintenance, the structure provided in this embodiment sets the rotating mechanism 4 inside the detector body 1, rather than inside the sampling head. This simplifies the sampling head structure, reduces the sealing difficulty, and avoids the maintenance cost of battery replacement.

[0018] The online atmospheric particulate matter detector with multiple particle size switching provided in Embodiment 1 of this utility model solves the problem of long maintenance cycle of sampling heads with switchable particle size in the prior art, which can extend the maintenance cycle of online particulate matter monitoring equipment and reduce the workload of staff.

[0019] As a preferred embodiment, this embodiment also includes an identification sensor 5 and a control device 6; a plurality of identification marks are provided on the outer side wall of the sampling tube 2; the identification marks are equidistantly distributed in a circle on the side wall of the sampling tube 2; the identification marks correspond to each sector on the baffle 321 respectively; the identification sensor 5 is disposed inside the detector body 1; the identification sensor 5 is a photoelectric sensor; the identification marks are reflective patches; the control device 6 is electrically connected to the identification sensor 5; the rotating mechanism 4 is electrically connected to the control device 6. Several reflective patches are equidistantly distributed circumferentially on the outer wall of the sampling tube 2. Each reflective patch corresponds to a sector on the baffle 321, and this correspondence is pre-stored in the control device 6. When it is necessary to switch the target particle size, the control device 6 receives a sampling command and sends a start signal to the rotation mechanism 4, driving the sampling tube 2 to rotate around its own tube axis within the sampling channel 11. When the sampling tube 2 rotates, the reflective patches on its side wall rotate synchronously. The identification sensor 5, located inside the detector body 1, continuously emits detection light towards the side wall of the sampling tube 2 and receives the reflected signal in real time. When the reflective patch rotates to the identification sensor... When the sensor detects the area of ​​the sampling tube 2, it receives a strong reflected signal and converts it into an electrical signal, which is then sent to the control device 6. Areas without reflective patches do not show a strong reflected signal. The control device 6 uses this information to determine the real-time position of the sampling tube 2 and compares the received reflected electrical signal with a preset correspondence. When a signal from the reflective patch corresponding to the target particle size is detected, it determines that the target sector on the baffle 321 is aligned with the fan-shaped air inlet 311 of the first clamp 31. A stop signal is then sent to the rotating mechanism 4, causing the rotating mechanism 4 to stop driving. The sampling tube 2 and the second clamp 32 then come to a stop, thus completing the particle size switching positioning. Compared to existing technologies that rely entirely on a preset number of rotations of the motor inside the sampling head, which may lead to particle size switching deviations, this embodiment directly monitors the rotation of the sampling tube 2 to achieve the rotation of the second clamp 32 fixed at the upper end of the sampling tube 2. Therefore, the rotation angle of the second clamp 32 can be controlled more precisely, thus avoiding particle size switching deviations.

[0020] In a preferred embodiment, the rotating mechanism 4 includes a motor 41, a drive gear 42, and a driven gear 43. The driven gear 43 is coaxially fixed to the outer wall of the sampling tube 2. The drive gear 42 is coaxially fixed to the output shaft of the motor 41. The driven gear 43 meshes with the drive gear 42. In this embodiment, the rotation of the output shaft of the motor 41 drives the drive gear 42 to rotate. Since the driven gear 43 meshes with the drive gear 42, it in turn drives the driven gear 43 and the sampling tube 2 to rotate.

[0021] In summary, this utility model provides an online atmospheric particulate matter detector with multi-size switching capability, relating to the field of particulate matter monitoring technology. It includes a detector body, a sampling tube, a sampling head, and a rotating mechanism. The detector body has a sampling channel. The sampling tube is coaxially and rotatably fixed within the sampling channel. The outer wall of the sampling tube is sealed to the sampling channel. The rotating mechanism is located within the detector body and can drive the sampling tube to rotate within the sampling channel. The sampling head includes a first clamp and a second clamp. The first clamp has an air inlet at its top. The bottom is provided with a cylindrical groove; the air inlet is connected to the cylindrical groove; the air inlet is fan-shaped; the second clamp is cylindrical; the upper end of the second clamp is coaxially and rotatably fixed in the cylindrical groove; the upper end of the second clamp is provided with a baffle; the baffle includes multiple sectors; the shape of the sectors is the same as the shape of the air inlet; different sectors are provided with guide holes of different diameters; the guide holes in the same sector have the same diameter; the lower end of the cylindrical tube of the second clamp is coaxially connected and fixed to the upper end of the sampling tube; the bottom of the first clamp is fixed to the detector body. The multi-particle-size switchable online atmospheric particulate matter detector provided by this utility model solves the problem of long maintenance cycles for existing sampling heads with switchable particle sizes, extending the maintenance cycle of online particulate matter monitoring equipment and reducing the workload of staff.

[0022] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the contents of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. An online atmospheric particulate matter detector capable of switching between multiple particle sizes, comprising a detector body, a sampling tube, and a sampling head; characterized in that, It also includes a rotating mechanism; The detector body is equipped with a sampling channel; The sampling tube is coaxially and rotatably fixed within the sampling channel; the outer wall of the sampling tube is sealed to the sampling channel; the rotation mechanism is disposed within the detector body; the rotation mechanism can drive the sampling tube to rotate within the sampling channel. The sampling head includes a first clamp and a second clamp; the first clamp has an air inlet at its top; the first clamp has a cylindrical groove at its bottom; the air inlet communicates with the cylindrical groove; the air inlet is fan-shaped; The second clamp is cylindrical; the upper end of the second clamp is coaxially and rotatably fixed in the cylindrical groove; a baffle is provided at the upper end of the second clamp; the baffle includes multiple sectors; the shape of the sector is the same as the shape of the air inlet; different sectors are provided with guide holes of different diameters; the guide holes on the same sector have the same diameter; The lower end of the circular tube of the second clamp is coaxially connected and fixed to the upper end of the sampling tube; the bottom of the first clamp is fixed to the body of the detector.

2. The online atmospheric particulate matter detector with multi-size switching capability as described in claim 1, characterized in that, It also includes identification sensors and control devices; The sampling tube has several identification marks on its sidewall; the identification marks are equidistantly distributed in a circle on the sidewall of the sampling tube; the identification marks correspond to each sector on the baffle. The identification sensor is installed inside the detector body; The control device is electrically connected to the identification sensor; The rotating mechanism is electrically connected to the control device.

3. The online atmospheric particulate matter detector with multi-size switching capability as described in claim 1, characterized in that, The rotating mechanism includes a motor, a drive gear, and a driven gear; The driven gear is coaxially fixed to the outer wall of the sampling tube; The drive gear is fixed coaxially with the output shaft of the motor; The driven gear meshes with the driving gear.

4. The online atmospheric particulate matter detector with multi-size switching capability as described in claim 2, characterized in that, The identification sensor is a photoelectric sensor; the identification mark is a reflective patch.

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