Sampling head for atmospheric particulate online detector

Abstract

The utility model provides a sampling head for an atmospheric particulate online detector, which relates to the field of atmospheric environment detection and comprises a first clamp holder and a second clamp holder. A circular groove is formed in the bottom of the first clamp holder; the second clamp holder is cylindrical and is hollow inside and open at the top; an annular limiting piece is arranged in the second clamp holder; the top end of the second clamp holder is arranged in the circular groove in a sleeved mode. A baffle is arranged in the circular groove; a fan-shaped ventilation hole is formed in the baffle plate; a cutter is rotatably arranged above the annular limiting piece; the cutter is divided into a plurality of sectors by taking the circle center as the center; a plurality of flow guide holes with diameters from small to large are sequentially formed in the sector along a clockwise distribution sequence; the baffle can block the flow guide holes except the ventilation hole area. According to the utility model, the problems that the cutter and the impact plate need to be frequently replaced and the use operation is tedious when the atmospheric particulates with various particle sizes are collected in the prior art can be solved, and the atmospheric particulates with various particle sizes can be collected without replacing the cutter.

Description

Technical Field

[0001] The utility model relates to the technical field of atmospheric environment detection, in particular to a sampling head for an online atmospheric particle detector. Background Art

[0002] Atmospheric particulate matter is a general term for various solid and liquid particulate matter in the atmosphere. In order to monitor air quality, atmospheric particulate matter needs to be collected and tested;

[0003] However, since the particle size distribution range of particulate matter in the air is wide, ranging from a few nanometers to tens of microns, and sampling has certain requirements on the particle size of particulate matter; in this regard, the Chinese patent application number 202121448674.X discloses a sampling head for an online atmospheric particulate matter monitor, including a cutter clamp, an impact plate clamp, a cutter and an impact plate; the cutter clamp and the impact plate clamp are respectively provided with a first groove and a second groove, and one end of the impact plate clamp provided with the second groove is sleeved in the first groove; the cutter and the impact plate are arranged in the second groove, the cutter and the cutter clamp are in contact with each other, and the impact plate and the impact plate clamp are in contact with each other; an air inlet channel is provided between the first groove and the external environment; an air outlet channel is provided between the second groove and the external environment; a sampling tube is installed in the air outlet channel. The sampling head provided by the patent can allow air to enter the cutter, and the first guide hole on the cutter will initially screen and block the particles, and the second guide hole and arc-shaped guide hole on the impact plate will secondarily screen and block the particles, and finally the air will enter the sampling tube through the outlet pipe to complete the sampling of air particles of the required particle size.

[0004] However, when using the sampling head provided by the above patent, when it is necessary to collect atmospheric particulate matter of various particle sizes, it is necessary to frequently twist the impact plate clamp and the second groove to replace the appropriate cutter and impact plate, and the operation of using the sampling head is cumbersome. Utility Model Content

[0005] In response to the above-mentioned problems, the utility model provides a sampling head for an online atmospheric particulate matter detector, which can solve the problem that when the prior art needs to collect atmospheric particulate matter of various particle sizes, it is necessary to frequently replace suitable cutters and impact plates, and the operation is cumbersome, and it can collect atmospheric particulate matter of various particle sizes without replacing the cutter.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] The utility model provides a sampling head for an online atmospheric particle detector, comprising a first clamp and a second clamp; a circular groove is arranged at the bottom of the first clamp; the second clamp is cylindrical; the interior of the second clamp is hollow; the top of the second clamp is open; an annular stopper is arranged inside the second clamp; the outer wall of the annular stopper is fixed to the inner wall of the second clamper; the annular stopper is close to the top of the second clamper; the top end of the second clamper is sleeved in the circular groove;

[0008] A baffle is arranged in the circular groove; the baffle is arranged horizontally; the edge of the baffle is fixed to the side wall of the circular groove; and a fan-shaped ventilation hole is opened on the baffle;

[0009] A cutter is rotatably arranged above the annular stopper; the baffle is located above the cutter; the cross section of the cutter is circular; the diameter of the cutter is larger than the inner diameter of the annular stopper and smaller than the outer diameter of the annular stopper; the cutter is concentric with the annular stopper; the cutter is divided into a plurality of sectors with its circle center as the center; the sectors are sequentially provided with a plurality of guide holes with diameters from small to large in a clockwise distribution order; there is only one diameter of the guide holes on the sector; the baffle is concentric with the cutter; the baffle can block the guide holes except those in the ventilation hole;

[0010] An air inlet communicating with the circular groove is provided at the top of the first clamp; an air outlet is provided at the bottom of the second clamp; a sampling tube is arranged below the second clamp; and the air outlet is communicated with the sampling tube.

[0011] The sampling head for the online detector of atmospheric particulate matter provided by the utility model is preferably provided with an air outlet pipe vertically below the cutter; the air outlet pipe is fixed to the bottom of the cutter; the guide hole is connected to the air outlet pipe; the diameter of the air outlet pipe is smaller than the inner diameter of the annular limiter; the air outlet pipe is concentric with the cutter; the air outlet pipe is connected to the air outlet; a bearing is provided outside the air outlet pipe; the outer side wall of the air outlet pipe is fixed to the inner ring of the bearing; the inner side wall of the second clamp is fixed to the outer ring of the bearing; the bottom of the bearing is in contact with the upper bottom surface of the second clamp;

[0012] A driven gear is fixed horizontally on the outer wall of the air outlet pipe; a motor is fixed on the inner wall of the second clamper; the output shaft of the motor is vertically downward; a driving gear is fixed horizontally on the output shaft of the motor; the driving gear and the driven gear are meshed for transmission.

[0013] The sampling head for the online detector of atmospheric particulate matter provided by the utility model is preferably provided with an annular groove on the upper surface of the cutter; the annular groove is adjacent to the edge of the cutter; a cleaning groove is provided between two adjacent sectors; the farther from the center of the cutter, the deeper the depth of the cleaning groove; the cleaning groove is connected with the annular groove;

[0014] A plurality of brushes for cleaning particles are arranged on the lower surface of the baffle.

[0015] The utility model provides a sampling head for an online atmospheric particulate matter detector, preferably, the side wall of the circular groove is provided with an internal thread line; the internal thread line is located below the baffle; the outer wall of the second clamp is provided with an external thread line; the circular groove and the second clamp are tightly connected by threads.

[0016] The above technical solution has the following advantages or beneficial effects:

[0017] The sampling head for the online atmospheric particle detector provided by the utility model solves the problem that when collecting atmospheric particles of various particle sizes, it is necessary to frequently replace suitable cutters and impact plates, which is cumbersome to use and operate. A baffle is arranged in the circular groove, and fan-shaped ventilation holes are opened on the baffle to limit the air flow direction; a cutter is rotatably arranged above the annular limiter, the diameter of the cutter is larger than the inner circle diameter of the annular limiter and smaller than the outer circle diameter of the annular limiter, the cutter is concentric with the annular limiter, the annular limiter can hold up the cutter and limit the position of the cutter to prevent the cutter from shaking in the second clamping member, and avoid the cutter cutting Particles are affected; in order to cooperate with the fan-shaped ventilation holes opened on the baffle, the cutter is divided into several sectors with its center as the center. The sectors are distributed in a clockwise order, and a number of guide holes with diameters from small to large are opened in sequence. There is only one guide hole of the diameter size on the sector. The baffle is located above the cutter. By rotating the cutter, the ventilation holes on the baffle select the guide holes of the required diameter size to screen the particles to be detected. The baffle can block the guide holes except the ventilation hole area to prevent particles in the air that do not meet the diameter size requirements from entering the sampling tube from other guide holes, so as to collect atmospheric particles of various particle sizes without changing the cutter. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention and its features, appearance and advantages will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings. The same reference numerals indicate the same parts in all the drawings. The drawings are not drawn to scale, but the emphasis is on illustrating the subject matter of the present invention.

[0019] Figure 1It is a three-dimensional structural schematic diagram of a sampling head for an online atmospheric particulate matter detector provided in Example 1 of the utility model.

[0020] Figure 2 It is a schematic diagram of the vertical cross-sectional structure of a sampling head for an online atmospheric particulate matter detector provided in Example 1 of the utility model.

[0021] Figure 3 It is a schematic diagram of the upward structure of a first clamp in a sampling head for an online atmospheric particulate matter detector provided in Example 1 of the utility model.

[0022] Figure 4 It is a schematic diagram of the top view of the structure of the second clamp in a sampling head for an online atmospheric particulate matter detector provided in Example 1 of the utility model.

[0023] Figure 5 It is a schematic diagram of the horizontal cross-sectional structure of a sampling head for an online atmospheric particulate matter detector provided in Example 1 of the utility model.

[0024] Figure 6 This is another horizontal cross-sectional structural schematic diagram of a sampling head for an online atmospheric particulate matter detector provided in Example 1 of the utility model. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0026] Embodiment 1:

[0027] like Figures 1 to 4 As shown, a sampling head for an online atmospheric particulate matter detector provided by Example 1 of the utility model comprises a first clamp 1 and a second clamp 2; a circular groove 11 is provided at the bottom of the first clamp 1; the second clamp 2 is cylindrical; the second clamp 2 is hollow inside; the top of the second clamp 2 is open; an annular stopper 21 is provided inside the second clamp 2; the outer wall of the annular stopper 21 is fixed to the inner wall of the second clamp 2; the annular stopper 21 is close to the top of the second clamp 2; the top of the second clamp 2 is sleeved in the circular groove 11;

[0028] A baffle 111 is disposed in the circular groove 11; the baffle 111 is disposed horizontally; the edge of the baffle 111 is fixed to the side wall of the circular groove 11; a fan-shaped ventilation hole 1111 is opened on the baffle 111;

[0029] A cutter 22 is rotatably provided above the annular stopper 21; the baffle 111 is located above the cutter 22; the cross section of the cutter 22 is circular; the diameter of the cutter 22 is larger than the inner diameter of the annular stopper 21 and smaller than the outer diameter of the annular stopper 21; the cutter 22 is concentric with the annular stopper 21; the cutter 22 is divided into a plurality of sectors 221 with its circle center as the center; the sectors 221 are arranged in a clockwise order, and a plurality of guide holes 2211 with diameters from small to large are sequentially provided; there is only one guide hole 2211 of one diameter on the sector 221; the baffle 111 is concentric with the cutter 22; the baffle 111 can block the guide holes 2211 except for the ventilation hole 1111 area;

[0030] An air inlet 12 communicating with the circular groove 11 is formed at the top of the first holder 1 ; an air outlet 23 is formed at the bottom of the second holder 2 ; a sampling tube 3 is arranged below the second holder 2 ; and the air outlet 23 communicates with the sampling tube 3 .

[0031] When using the sampling head for the online atmospheric particulate matter detector provided in Example 1 of the utility model, the sampling head is installed on the online detector. For example, the Chinese patent No. 201620152116.1 discloses an atmospheric particulate matter calibration detector, in which the sampling head is arranged at the top of the outer surface of the main body, and the sampling tube is connected to the filter; air enters the first holder 1 from the air inlet 12 of the sampling head, passes through the baffle 111 arranged in the circular groove 11, and reaches the cutter from the ventilation hole 1111 opened on the baffle 111. 22, particle cutting is performed; by rotating the cutter 22, the fan-shaped ventilation holes 1111 select the sector 221 of the guide hole 2211 of the required diameter size on the cutter 22, and the particles in the air collide with the cutter 22, and the particles smaller than the set diameter size of the guide hole 2211 pass through the guide hole 2211 through the cutter 22, and enter the sampling tube 3 from the air outlet 23 on the second clamp 2; after the particles are collected, they enter the filter through the sampling tube 3 and can be further detected by the online detector in the above-mentioned prior art.

[0032] The sampling head for the online atmospheric particle detector provided by the utility model embodiment 1 is provided with a baffle 111 in the circular groove 11 to solve the problem of frequent replacement of suitable cutters and impact plates when collecting atmospheric particles of various particle sizes, which is cumbersome to use and operate. The baffle 111 is provided with fan-shaped ventilation holes 1111 on the baffle 111 to limit the air flow direction; a cutter 22 is rotatably provided above the annular limiter 21, and the diameter of the cutter 22 is larger than the inner circle diameter of the annular limiter 21 and smaller than the outer circle diameter of the annular limiter 21. The cutter 22 is concentric with the annular limiter 21, and the annular limiter 21 can hold up the cutter 22 and limit the position of the cutter 22 to prevent the cutter 22 from shaking in the second clamping member 2, so as to avoid the cutter 22 being affected when cutting particles; In order to cooperate with the fan-shaped ventilation holes 1111 opened on the baffle 111, the cutter 22 is divided into a number of sectors 221 with its center as the center. The sectors 221 are arranged in a clockwise order, and a number of guide holes 2211 with diameters from small to large are opened in sequence. There is only one guide hole 2211 with a diameter size on the sector 221. The baffle 111 is located above the cutter 22. The ventilation holes 1111 on the baffle 111 can select the guide holes 2211 with the required diameter size by rotating the cutter 22 to screen the particles to be detected. The baffle 111 can block the guide holes 2211 except the ventilation holes 1111 area to prevent particles in the air that do not meet the diameter size requirements from entering the sampling tube 3 from other guide holes 2211, so as to collect atmospheric particles of various particle sizes without changing the cutter.

[0033] like Figure 2 , Figure 5 and Figure 6As shown, the sampling head for the online atmospheric particle detector provided in Example 1 of the utility model is preferably provided with an air outlet pipe 24 vertically arranged below the cutter 22 in order to guide the particles in the air into the sampling tube 3 from the guide hole 2211, the air outlet pipe 24 is fixed to the bottom of the cutter 22, the guide hole 2211 is connected with the air outlet pipe 24, the air outlet pipe 24 is connected with the air outlet port 23, the particles in the air enter the air outlet pipe 24 after passing through the guide hole 2211, and then enter the air outlet port 23 from the air outlet pipe 24, the air outlet port 23 is connected with the sampling tube 3, and the sampling tube 3 collects the particles discharged from the air outlet port 23; in order to allow the air outlet pipe 24 to pass through the annular stopper 21, the diameter of the air outlet pipe 24 is made smaller than the inner circle diameter of the annular stopper 21, and the air outlet pipe 24 is concentric with the cutter 22; a bearing 25 is provided outside the air outlet pipe 24, and the outer wall of the air outlet pipe 24 is aligned with the inner ring of the bearing 25 The inner wall of the second holder 2 is fixed to the outer ring of the bearing 25, and the bottom of the bearing 25 is in contact with the upper bottom surface of the second holder 2, so that the air outlet pipe 24 has the ability to rotate relative to the second holder 2, preventing the contact surface of the air outlet pipe 24 and the second holder 2 from generating friction, reducing the wear between the air outlet pipe 24 and the second holder 2, and improving the service life of the sampling head. In addition, reducing friction can reduce the power required to be output by the motor 26, improve the smoothness of switching the sectors 221, and thus improve the user experience of the sampling head; the air outlet pipe 24 is connected to the bottom of the cutter 22, and the air outlet pipe 24 is concentric with the cutter 22. When the air outlet pipe 24 rotates, the cutter 22 fixedly connected to the air outlet pipe 24 also rotates, thereby adjusting the corresponding relationship between the sectors 221 on the cutter 22 and the ventilation holes 1111 on the baffle 111, so as to collect atmospheric particulate matter of various particle sizes without replacing the cutter;

[0034] Furthermore, in order to control the switching of the sectors 221 used on the cutter 22, a driven gear 241 is horizontally fixed on the outer wall of the air outlet pipe 24, and a motor 26 is fixed on the inner wall of the second clamper 2. The output shaft of the motor 26 is vertically downward, and a driving gear 261 is horizontally fixed on the output shaft of the motor 26. The driving gear 261 and the driven gear 241 are meshed for transmission. By controlling the rotation of the motor 26, the driving gear 261 on the motor 26 is controlled to rotate, and the driving gear 261 is meshed with the driven gear 241 for transmission, so that the air outlet pipe 24 fixed to the driven gear 241 rotates, and the cutter 22 fixed to the air outlet pipe 24 can rotate relative to the baffle 111, thereby realizing the replacement of the sectors 221 used on the cutter 22.

[0035] like Figure 2 to Figure 4As shown, the sampling head for the online detector of atmospheric particulate matter provided in Example 1 of the utility model is preferably provided with a plurality of bristles 1112 for cleaning particulate matter on the lower surface of the baffle 111 in order to prevent the particulate matter remaining on the upper surface of the cutter 22 from clogging the guide hole 2211, so as to sweep away the particulate matter that cannot enter the guide hole 2211, and an annular groove 222 is provided on the upper surface of the cutter 22, and the annular groove 222 is used to store the residual particulate matter, and the annular groove 222 is adjacent to the edge of the cutter 22; after using a certain sector 221 on the cutter 22, here it means that a certain sector 221 on the cutter 22 corresponds to the ventilation hole 1111 on the baffle 111, and particulate matter that cannot pass through the guide hole 2211 on the sector 221 will remain on the sector 221, and between two adjacent A cleaning groove 223 is provided between the sectors 221. When the sectors 221 are switched, the brush provided on the lower surface of the baffle 111 will sweep over the sectors 221 where particulate matter remains, to prevent the remaining particulate matter from clogging the guide holes 2211 provided on other sectors 221, or entering the guide holes 2211 provided on other sectors 221, thereby reducing the interference of the remaining particulate matter on the next atmospheric particulate matter sampling. When the remaining particulate matter enters the cleaning groove 223 from the upper surface of the cutter 22, the farther from the center of the cutter 22, the deeper the depth of the cleaning groove 223, and the particulate matter in the cleaning groove 223 gradually moves toward the outside of the cutter 22 under inclination, so that the cleaning groove 223 is connected with the annular groove 222, and the particulate matter in the cleaning groove 223 can enter the annular groove 222 to prevent the cleaning groove 223 from being blocked.

[0036] like Figure 2 As shown, the sampling head for the online atmospheric particulate matter detector provided in Example 1 of the utility model is preferably provided with an internal thread line 112 on the side wall of the circular groove 11, and an external thread line 27 on the outer wall of the second clamp 2, in order to facilitate the disassembly and assembly of the sampling head and the removal of particulate matter accumulated in the annular groove 222 on the internal cutter 22, and the circular groove 11 is tightly connected to the second clamp 2 by threads, and the cutter 22 is clamped between the first clamp 1 and the second clamp 2; further, the internal thread line 112 is located below the baffle 111, so that the baffle 111 can be close to the upper surface of the cutter 22, preventing particulate matter in the air entering from the ventilation hole 1111 on the baffle 111 from entering the sampling tube 3 from other sectors 221 on the cutter 22, thereby reducing the error of atmospheric particulate matter sampling.

[0037] In summary, the sampling head for the online atmospheric particulate matter detector provided by the utility model can solve the problem that when the existing technology needs to collect atmospheric particulate matter of various particle sizes, it is necessary to frequently replace suitable cutters and impact plates, and the operation is cumbersome, and it can collect atmospheric particulate matter of various particle sizes without replacing the cutter.

[0038] Those skilled in the art should understand that those skilled in the art can implement the above-mentioned variations by combining the prior art and the above-mentioned embodiments, which will not be described in detail here. Such variations do not affect the essential content of the present utility model, and will not be described in detail here.

[0039] The above describes the preferred embodiments of the utility model. It should be understood that the utility model is not limited to the above-mentioned specific embodiments, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can make many possible changes and modifications without departing from the technical solution of the utility model, or modify them into equivalent embodiments with equivalent changes, which does not affect the essential content of the utility model. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the utility model without departing from the content of the technical solution of the utility model still falls within the scope of protection of the technical solution of the utility model.

Claims

1. A sampling head for an online atmospheric particulate matter detector, characterized in that: The invention comprises a first clamp and a second clamp; a circular groove is arranged at the bottom of the first clamp; the second clamp is cylindrical; the interior of the second clamp is hollow; the top of the second clamp is open; an annular stopper is arranged inside the second clamp; the outer wall of the annular stopper is fixed to the inner wall of the second clamper; the annular stopper is close to the top of the second clamper; the top end of the second clamper is sleeved in the circular groove; A baffle is arranged in the circular groove; the baffle is arranged horizontally; the edge of the baffle is fixed to the side wall of the circular groove; and a fan-shaped ventilation hole is opened on the baffle; A cutter is rotatably arranged above the annular stopper; the baffle is located above the cutter; the cross section of the cutter is circular; the diameter of the cutter is larger than the inner diameter of the annular stopper and smaller than the outer diameter of the annular stopper; the cutter is concentric with the annular stopper; the cutter is divided into a plurality of sectors with its circle center as the center; the sectors are sequentially provided with a plurality of guide holes with diameters from small to large in a clockwise distribution order; there is only one diameter of the guide holes on the sector; the baffle is concentric with the cutter; the baffle can block the guide holes except the ventilation hole area; An air inlet communicating with the circular groove is provided at the top of the first clamp; an air outlet is provided at the bottom of the second clamp; a sampling tube is arranged below the second clamp; and the air outlet is communicated with the sampling tube.

2. The sampling head for the online atmospheric particulate matter detector according to claim 1, characterized in that: An air outlet pipe is vertically arranged below the cutter; the air outlet pipe is fixed to the bottom of the cutter; the guide hole is connected to the air outlet pipe; the diameter of the air outlet pipe is smaller than the inner diameter of the annular limiter; the air outlet pipe is concentric with the cutter; the air outlet pipe is connected to the air outlet; a bearing is arranged outside the air outlet pipe; the outer wall of the air outlet pipe is fixed to the inner ring of the bearing; the inner wall of the second clamp is fixed to the outer ring of the bearing; the bottom of the bearing is in contact with the upper bottom surface of the second clamp; A driven gear is fixed horizontally on the outer wall of the air outlet pipe; a motor is fixed on the inner wall of the second clamper; the output shaft of the motor is vertically downward; a driving gear is fixed horizontally on the output shaft of the motor; the driving gear and the driven gear are meshed for transmission.

3. The sampling head for the online atmospheric particulate matter detector according to claim 1, characterized in that: An annular groove is provided on the upper surface of the cutter; the annular groove is adjacent to the edge of the cutter; a cleaning groove is provided between two adjacent sectors; the farther from the center of the cutter, the deeper the cleaning groove; the cleaning groove is connected to the annular groove; A plurality of brushes for cleaning particles are arranged on the lower surface of the baffle.

4. The sampling head for the online atmospheric particulate matter detector according to claim 1, characterized in that: The side wall of the circular groove is provided with an internal thread line; the internal thread line is located below the baffle; the outer wall of the second clamp is provided with an external thread line; the circular groove and the second clamp are tightly connected through threads.

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