TWM636107U - Adjustable aerosol concentration calibration device and outlet structure thereof - Google Patents

Abstract

An adjustable aerosol concentration calibration device, including a mixing chamber, an atomizer and an outlet structure, a chamber is formed inside the mixing chamber, and a gas inlet is provided at one end of the mixing chamber, which can be used to input dry gas , the outlet structure is arranged at the other end of the mixing chamber, the outlet structure has a reducer, the inner diameter of the reducer is tapered toward the direction away from the mixing chamber, and its taper is 20 degrees to 40 degrees. The atomizer is arranged at one end of the mixing chamber, and the solution delivery device can deliver the solution to the atomizer, so that the solution is atomized through the atomizer and sprayed into the chamber of the mixing chamber, and the atomized droplets and the dry The gas is transported forward, and the atomized liquid droplets are contacted with the dry gas to form an aerosol with stable mass concentration and particle size distribution. In this way, it can be used to improve the problem of aerosol loss, make the air flow more smooth, and achieve the effect that the aerosol will not remain in the cavity and greatly improve the accuracy of the calibration system.

Description

Adjustable aerosol concentration calibration device and its outlet structure

The invention relates to an outlet structure, especially an adjustable aerosol concentration calibration device and its outlet structure for conveniently verifying the mass concentration measurement of aerosol components.

For the study of aerosols (also known as aerosols), many literatures have deep theoretical foundations and models. The study of its properties is nothing more than actual sampling and telemetry, but limited by atmospheric aerosols that change with time and space, Therefore, there are still many uncertain factors that cannot be known immediately, such as the particle size distribution, composition and mass concentration of the aerosol. At present, there is no so-called primary standard for the mass concentration of aerosols, so the calibration of related instruments and equipment mostly uses filter paper sampling for parallel comparison. However, the method of sampling with filter paper requires pre-treatment of the filter paper and transportation of the filter paper, which is prone to human error.

Taiwan patent certificate number: I644091 discloses a "particle generating device for particle component concentration calibration", including a mixing chamber and an atomizer, a chamber is formed inside the mixing chamber, and a gas inlet is provided at the upper end of the mixing chamber , can be used to input dry gas, the lower end of the mixing chamber is provided with an outlet. The atomizer is arranged at the upper end of the mixing chamber, and the solution delivery device can deliver the solution to the atomizer, so that the solution is atomized by the atomizer, and sprayed into the chamber near the upper end of the mixing chamber, and the atomized droplets When falling down, it can contact with dry gas to form an aerosol with stable concentration and particle size distribution. Thereby, the subsequent comparison and calibration of the continuous aerosol mass concentration monitor, on-line aerosol composition monitor or FRM sampler can be facilitated. The above-mentioned particle generating device can effectively reduce human errors.

However, in the existing particle generation device (aerosol concentration calibration device), the taper of the outlet structure of the reducer is 45°. With the assistance of CFD software, it is simulated that the flow rate of the positive pressure is 25L/min. The taper of the tube is too large, so the aerosol cannot be completely carried out by the airflow, and part of the aerosol will remain in the cavity and cause loss, which will affect the accuracy of the calibration system. Specifically, the first-level standard aerosol concentration calibration system can quantitatively transport a solution of known composition and concentration to the nozzle of an ultrasonic nebulizer through a syringe pump, and break the solution into tiny droplets by vibration A constant flow of clean and dry dilute gas is introduced and mixed with tiny droplets to form an aerosol with a stable particle size distribution and known components and quality concentrations. Therefore, after the solution is broken into tiny droplets by an ultrasonic nebulizer, once If there is a loss in the process of entering the instrument under test, it will not be able to provide a stable concentration of aerosol, which will affect the accuracy of the calibration system.

The technical problem to be solved in this creation is to provide an adjustable aerosol concentration calibration device and its outlet structure for the deficiencies of the existing technology, which can be used to improve the problem of aerosol loss. After reducing the taper to 20 degrees to 40 degrees, It can make the airflow more smooth, and can achieve the effect that the aerosol will not remain in the cavity and greatly improve the accuracy of the calibration system.

In order to solve the above-mentioned technical problems, this creation provides an adjustable aerosol concentration verification device, including: a mixing chamber, a chamber is formed inside the mixing chamber, a gas inlet is provided at one end of the mixing chamber, and the gas inlet communicated with the chamber, the gas inlet can deliver dry gas into the chamber; an atomizer, the atomizer is arranged at one end of the mixing chamber, the solution can be delivered to the atomizer, through the mist The atomizer atomizes the solution into liquid droplets, and sprays it into the chamber near one end of the mixing chamber; and an outlet structure, which is arranged at the other end of the mixing chamber, and the atomized liquid droplets and the dry gas can mixed with each other and conveyed towards the outlet structure, the outlet structure has a converging tube, the converging tube is tapered towards the direction away from the mixing chamber, the inside of the constricting tube communicates with the chamber, and the converging tube The taper of the tube is 20 degrees to 40 degrees.

Preferably, the length of the reducer is greater than the maximum inner diameter of the reducer.

Preferably, the taper of the reducer is 30 degrees.

Preferably, the inner diameter of the mixing chamber is 110mm, the maximum inner diameter of the reducer is 110mm, the minimum inner diameter of the reducer is 29mm, and the length of the reducer is 142mm.

In order to solve the above-mentioned technical problems, this creation also provides an outlet structure of an adjustable aerosol concentration verification device, the outlet structure is arranged at one end of the mixing chamber of the adjustable aerosol concentration verification device, and the outlet structure has a tapered The constriction pipe is tapered towards the direction away from the mixing chamber, the inside of the constriction pipe is connected with the chamber, and the taper of the constriction pipe is 20° to 40°.

The beneficial effect of this creation is that the adjustable aerosol concentration calibration device and its outlet structure provided by this creation have a converging pipe, and the constricting pipe is tapered toward the direction away from the mixing chamber, and the tapered The inside of the tube communicates with the chamber of the mixing chamber, and the taper of the reducer is 20° to 40°. The outlet structure of this creation can be used to improve the problem of aerosol loss. After reducing the taper to 20 degrees to 40 degrees, the airflow can be made smoother, so that the aerosol will not remain in the cavity and greatly improve the accuracy of the calibration system. sexual effect.

In order to further understand the characteristics and technical content of this creation, please refer to the following detailed description and drawings about this creation. However, the provided drawings are only for reference and explanation, and are not used to limit this creation.

The implementation manners disclosed in this creation are described below through specific specific examples, and those skilled in the art can understand the advantages and effects of this creation from the content disclosed in this specification. This creation can be implemented or applied through other different specific embodiments, and the details in this specification can also be modified and changed based on different viewpoints and applications without departing from the idea of this creation. In addition, the drawings of this creation are only for simple illustration, not according to the actual size of the depiction, prior statement. The following embodiments will further describe the relevant technical content of this creation in detail, but the disclosed content is not intended to limit the protection scope of this creation. In addition, the term "or" used herein may include any one or a combination of more of the associated listed items depending on the actual situation.

[Example]

Please refer to FIG. 1 and FIG. 2 , the invention provides an adjustable aerosol concentration verification device, which includes a mixing chamber 1 , an atomizer 3 and an outlet structure 5 .

The mixing chamber 1 is preferably a multi-piece structure, that is, the mixing chamber 1 can be formed by combining a plurality of cylinders 11 and 12 for easy assembly and disassembly, and thus is convenient for portability. The mixing chamber 1 can be set upright, that is, the axis A of the mixing chamber 1 can be perpendicular to the horizontal plane, but it is not limited. For example, the mixing chamber 1 can also be set at other angles, such as horizontal, inclined or inverted and so on. A chamber 13 is formed inside the mixing chamber 1 , a gas inlet 14 is provided at one end of the mixing chamber 1 , and the gas inlet 14 communicates with the chamber 13 . In this embodiment, the gas inlet 14 is located at the lower end of the mixing chamber 1. In another embodiment, the gas inlet 14 can also be located at the upper end of the mixing chamber 1. The gas inlet 14 can transport dry gas into chamber 13.

In this embodiment, a partition 15 is further arranged around one end (lower end) of the chamber 13 of the mixing chamber 1. The partition 15 can be in the shape of a hollow cylinder, and the partition 15 is arranged concentrically with the chamber 13. , the dividing plate 15 can divide the near lower end of the chamber 13 into an inner ring inlet chamber 16 and an outer ring inlet chamber 17, and the inner ring inlet chamber 16 is located at the center of the chamber 13 of the mixing chamber 1 , the outer ring air intake chamber 17 is located outside the inner ring air intake chamber 16 . The inner ring air intake chamber 16 and the outer ring air intake chamber 17 communicate with the gas inlet 14 respectively, so that the dry gas can be transported to the inner ring air inlet chamber 16 and the outer ring air inlet chamber 17 respectively through the gas inlet 14 . One end (such as the upper end) of the inner ring inlet chamber 16 and the outer ring inlet chamber 17 is open, so that the gas delivered to the inner ring inlet chamber 16 and the outer ring inlet chamber 17 can be sent toward the direction of the outlet structure 5 . Preferably, a tapered surface 151 is formed on the inner side of the partition 15, one end of the tapered surface 151 is close to the atomizer 3, and the tapered surface 151 extends to the other end of the partition 15, so that the inside of the partition 15 Forming an expanding shape toward the chamber 13 , the tapered surface 151 can guide the atomized liquid droplets and dry gas to be evenly delivered into the chamber 13 .

The atomizer 3 is a device that can atomize the solution (solution with known composition and concentration). In this embodiment, the atomizer 3 can be an ultrasonic atomizer, and the atomizer 3 is arranged in the At one end (lower end) of the cavity 1, the atomizer 3 is connected to an existing solution delivery device, which can deliver the solution to the atomizer 3, and the atomizer 3 has a nozzle 31, which is located in the mixing chamber In the chamber 13 of 1, in this embodiment, the nozzle 31 is located in the inner ring inlet chamber 16 of the mixing chamber 1, and the nozzle 31 may be located at the center of the inner ring inlet chamber 16 of the mixing chamber 1.

The type of the solution of the present invention is not limited, for example, it may be a solution such as salt. When the solution is delivered to the atomizer 3 , the solution can be atomized into droplets by the atomizer 3 and sprayed out from the nozzle 31 to the near end (the lower end) of the chamber 13 of the mixing chamber 1 . After filtering, the cleaned dry gas can be transported to the near end of the chamber 13 of the mixing chamber 1, and the atomized liquid droplets and the dry gas can be mixed with each other and transported towards the outlet structure 5, which is upward in this embodiment. When the atomized liquid droplets are in contact with dry gas, aerosols with stable mass concentration and particle size distribution can be produced, for example, particles with a particle size distribution below 2.5 μm can be produced, so that the particle size can be controlled within a fixed range , in order to carry out the subsequent comparison and calibration of the continuous aerosol mass concentration monitor, online aerosol composition monitor or FRM sampler, and reduce the errors caused by humans. The concentration of the solution components, the flow rate and the gas flow rate can all be adjusted and changed according to the need for calibration.

The outlet structure 5 is arranged at the other end (such as the upper end) of the mixing chamber 1. The outlet structure 5 has a reducer 51. Preferably, the reducer 51 is a stainless steel reducer. The reducer 51 It is tapered toward the direction away from the mixing chamber 1 , and the inside of the tapered pipe 51 communicates with the chamber 13 . The taper θ of the reducer 51 is 20 degrees to 40 degrees, the taper θ of the reducer 51 can be 20 degrees, 25 degrees, 30 degrees, 35 degrees or 40 degrees, etc., the taper θ of the reducer 51 is the most The best temperature is 30 degrees, which can make the airflow more smooth, so that the air gel will not remain in the cavity. The taper θ of the reducer 51 refers to the taper inside the reducer 51 , and can also be regarded as an included angle inside the reducer 51 . Preferably, the reducer 51 corresponds to the center of the chamber 13 of the mixing chamber 1 , that is, the reducer 51 and the mixing chamber 1 may have the same axis A. The inner diameter of the reducer 51 is tapered toward the direction away from the mixing chamber 1, the reducer 51 can be connected to an appropriate device to be tested, and the outlet structure 5 can be used to connect to an online aerosol composition monitor or FRM sampling for instrument calibration.

One end of the reducer 51 close to the mixing chamber 1 can be provided with a first flange 52, and the other end of the mixing chamber 1 is provided with a second flange 18, the first flange 52 and the second flange 18 can be used The outlet structure 5 is assembled and connected to the other end of the mixing chamber 1 by means of screw locking or the like. The end of the reducer 51 far away from the mixing chamber 1 can be provided with a connecting tube installation seat 53, which can be used for installing a connecting tube so as to be connected with the instrument under test at the rear end.

Preferably, the length L of the reducer 51 is greater than the maximum inner diameter Φ1 of the reducer 51 . In this embodiment, the inner diameter of the mixing chamber 1 is 110 mm. Since the inner diameter needs to be reduced to 29 mm in order to connect with the instrument under test at the rear end, it is necessary to design a reducer 51 to reduce the diameter. The maximum inner diameter Φ1 of the reducer 51 in this embodiment is 110mm, the smallest inner diameter Φ2 is 29mm, the length L of the reducer 51 is 142mm, and the taper θ of the reducer 51 is 30°.

As shown in Figure 3, the CFD software is used for this creation to simulate the aerosol trajectory at a flow rate of 25L/min under positive pressure. As shown in Figure 4, CFD software was used for this creation to obtain a simulation map of the aerosol trajectory with a negative pressure of 16.67L/min. As shown in the simulation diagram of the aerosol trajectory above, after the solution is broken into tiny droplets by the ultrasonic nebulizer 3, no matter under the flow rate of positive pressure 25L/min or negative pressure 16.67L/min, the aerosol in the tube inner diameter In the process of shrinking from Φ110mm to Φ29mm, there is no residue in the cavity, which greatly improves the accuracy of the calibration system, and in subsequent experimental tests, the result of aerosol loss of less than 3% is achieved.

[Advantageous Effects of Embodiment]

The beneficial effect of this creation is that the adjustable aerosol concentration calibration device and its outlet structure provided by this creation have a converging pipe, and the constricting pipe is tapered toward the direction away from the mixing chamber, and the tapered The inside of the tube communicates with the chamber of the mixing chamber, and the taper of the reducer is 20° to 40°. The outlet structure of this creation can be used to improve the problem of aerosol loss. After reducing the taper to 20 degrees to 40 degrees, the airflow can be made smoother, so that the aerosol will not remain in the cavity and greatly improve the accuracy of the calibration system. sexual effect.

The content disclosed above is only the preferred feasible embodiment of this creation, and does not limit the scope of patent application for this creation. Therefore, all equivalent technical changes made by using the instructions and drawings of this creation are included in the application of this creation. within the scope of the patent.

1: Mixing chamber 11: barrel 12: barrel 13: chamber 14: Gas inlet 15: Partition 151: Tapered surface 16: Inner ring air intake chamber 17: Outer ring air intake chamber 18:Second flange 3: Atomizer 31: Nozzle 5: Export structure 51: reducer 52: First flange 53: Mounting seat A: axis line Φ1: the maximum inner diameter of the reducer Φ2: The minimum inner diameter of the reducer L: the length of the reducer θ: taper of reducer

Fig. 1 is a cross-sectional view of the controllable aerosol concentration verification device of the present invention.

Fig. 2 is a cross-sectional view of the outlet structure of the controllable aerosol concentration verification device of the present invention.

Fig. 3 is the simulated diagram (1) of the aerosol trajectory of this creation.

Fig. 4 is the simulation diagram (2) of the aerosol trajectory of this creation.

5: Export structure

51: reducer

52: First flange

53: Mounting seat

Φ 1: the maximum inner diameter of the reducer

Φ 2: The minimum inner diameter of the reducer

L: the length of the reducer

θ: taper of reducer

Claims (10)

An adjustable aerosol concentration calibration device, comprising: A mixing chamber, a chamber is formed inside the mixing chamber, a gas inlet is provided at one end of the mixing chamber, the gas inlet communicates with the chamber, and the gas inlet can transport dry gas into the chamber; An atomizer, the atomizer is arranged at one end of the mixing chamber, the solution can be delivered to the atomizer, the solution is atomized into droplets by the atomizer, and sprayed into the chamber of the mixing chamber near one end place; and An outlet structure, the outlet structure is arranged at the other end of the mixing chamber, the atomized liquid droplets and the dry gas can be mixed with each other and transported towards the outlet structure, the outlet structure has a reducer, the reducer is directed towards The direction away from the mixing chamber is tapered, the inside of the reducer is connected with the chamber, and the taper of the reducer is 20° to 40°. The adjustable aerosol concentration verification device as described in Claim 1, wherein the mixing chamber is set upright, the gas inlet is set at the lower end of the mixing chamber, the atomizer is set at the lower end of the mixing chamber, the An outlet structure is provided at the upper end of the mixing chamber. The controllable aerosol concentration verification device as described in claim 1, wherein a partition is arranged around the near end of the mixing chamber, and the partition partitions the near end of the chamber into an inner ring air inlet chamber and an outer ring inlet chamber, the inner ring inlet chamber is located at the center of the mixing chamber, the outer ring inlet chamber is located outside the inner ring inlet chamber, the inner ring inlet chamber and the outer The ring inlet chambers are respectively connected with the gas inlets, and the dry gas can be transported to the inner ring inlet chambers and the outer ring inlet chambers respectively through the gas inlets. The inner side of the partition forms a conical surface, and the conical surface One end of the cone is close to the atomizer, and the tapered surface extends to the other end of the partition, so that the inner side of the partition expands toward the chamber. The adjustable aerosol concentration verification device as described in Claim 1, wherein the length of the reducer is greater than the maximum inner diameter of the reducer. The adjustable aerosol concentration verification device as described in Claim 1, wherein the taper of the reducer is 30 degrees. The adjustable aerosol concentration verification device as described in claim item 5, wherein the inner diameter of the mixing chamber is 110mm, the maximum inner diameter of the reducer is 110mm, the minimum inner diameter of the reducer is 29mm, the reducer The length of the shrink tube is 142mm. An outlet structure of an adjustable aerosol concentration verification device, the outlet structure is arranged at one end of a mixing chamber of the adjustable aerosol concentration verification device, a chamber is formed inside the mixing chamber, and the outlet structure has a reducer , the reducer is tapered toward the direction away from the mixing chamber, the inside of the reducer communicates with the chamber, and the taper of the reducer is 20° to 40°. The outlet structure of the controllable aerosol concentration verification device as claimed in item 7, wherein the length of the reducer is greater than the maximum inner diameter of the reducer. The outlet structure of the controllable aerosol concentration verification device as described in Claim 7, wherein the taper of the reducer is 30 degrees. The outlet structure of the adjustable aerosol concentration verification device as described in claim item 9, wherein the inner diameter of the mixing chamber is 110mm, the maximum inner diameter of the reducer is 110mm, and the minimum inner diameter of the reducer is 29mm , the length of the reducer is 142mm.

Images