Novel hydrofluoric acid-resistant mist chamber

Abstract

The invention discloses a novel hydrofluoric acid-resistant fog chamber, which comprises a fog chamber with an upper opening and a lower opening, the upper opening of the fog chamber is a sample outlet, and the sample outlet is provided with a sample outlet pipe; a lower cover is arranged at a lower opening of the fog chamber, and the lower cover is provided with a liquid discharge pipe communicated with the interior of the fog chamber; the sample outlet and the liquid discharge pipe are in the same axial direction, and a hollow pipe inner column detachably connected to the sample outlet is arranged in the same axial direction; the side wall of the mist chamber is provided with a guide pipe communicated with the inner wall of the mist chamber, the guide pipe is connected with an atomizer through an adapter, the mist chamber is designed to be of a top-shaped structure, after the inner wall of the mist chamber is subjected to sodium treatment, the hydrophilicity of the inner wall of the mist chamber is improved, and similarly, large water drops on the inner wall of the mist chamber can be effectively intercepted through the arrangement of an inner column and a flow guide groove; large water drops are prevented from entering the sample outlet.

Description

Technical Field

[0001] The invention relates to the application field of fog chamber technology, and in particular to a novel hydrofluoric acid-resistant fog chamber. Background Art

[0002] In the fields of chemical engineering, materials science and mechanical manufacturing, full-spectrum direct-reading ICP spectrometer is a commonly used analytical instrument. It uses plasma generated by inductively coupled plasma to convert elements in the sample into detectable light signals, and determines the content of each element in the sample by measuring the intensity of these light signals. With the development of science and technology, the sales volume of full-spectrum direct-reading ICP spectrometers is increasing, and its application range is becoming more and more extensive, and the demand for some special devices is also increasing.

[0003] Although the hydrofluoric acid-resistant fog chamber of the existing full-spectrum direct-reading ICP spectrometer can already meet general usage requirements, there are still some problems. First, although the existing fog chamber design can throw out large aerosol particles to ensure that the aerosol is in small particles, due to the uneven speed of the aerosol during rotation, some larger particles may not be completely thrown out, thus affecting the stability of the test results. Secondly, although the existing hydrophilicity-enhancing surface treatment can prevent large-particle aerosols from aggregating into large water droplets on the inner wall, due to the limited treatment effect, it may not be able to completely eliminate the aggregation phenomenon, thus affecting the stability of the fog chamber. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a new type of hydrofluoric acid resistant mist chamber, which is designed to be a gyro-shaped structure and the inner wall of the mist chamber is treated with sodium to improve the hydrophilicity of the inner wall of the mist chamber. Similarly, the setting of the inner column and the guide groove can effectively intercept large water droplets on the inner wall of the mist chamber to prevent large water droplets from entering the sample outlet.

[0005] The technical scheme of the present invention is: a novel hydrofluoric acid resistant mist chamber, comprising a mist chamber with upper and lower openings, the upper opening of the mist chamber being a sample outlet, and the sample outlet being provided with a sample outlet tube; the lower opening of the mist chamber being provided with a lower cover, and the lower cover being provided with a liquid discharge tube communicating with the mist chamber;

[0006] The sample outlet and the liquid discharge pipe are in the same axial direction, and a hollow tube inner column detachably connected to the sample outlet is provided in the same axial direction;

[0007] The side wall of the mist chamber is provided with a guide tube connected to the inner wall of the mist chamber, and the guide tube is connected to the atomizer through an adapter.

[0008] Furthermore, the inner diameter of the upper opening is smaller than the inner diameter of the lower opening.

[0009] Furthermore, the inner wall of the mist chamber is a gyro-shaped structure.

[0010] Furthermore, the mist chamber is provided with a guide groove, and the guide groove extends along the top of the mist chamber to the inner wall of the mist chamber.

[0011] Furthermore, the guide groove arranged on the inner wall of the mist chamber is located on one side of the guide pipe.

[0012] Furthermore, the inner diameter of the sample outlet is larger than the inner diameter of the liquid discharge pipe.

[0013] Furthermore, one end of the inner column is plugged into the sample outlet, the other end of the inner column is located directly above the liquid discharge pipe, and the other end of the inner column is provided with a plurality of notches.

[0014] Furthermore, the lower cover is located at one end of the mist chamber and has a cone-shaped structure.

[0015] A novel method for preparing a hydrofluoric acid-resistant mist chamber comprises the following steps:

[0016] Step 1, selecting polytetrafluoroethylene as the main material of the spray chamber;

[0017] Step 2, preparing the interior of the mist chamber into a gyro-shaped structure;

[0018] Step 3, use 40 mesh sand to sandblast the inner wall of the mist chamber, the inner wall of the lower cover, and the inner column of the hollow tube;

[0019] Step 4: perform sodium treatment on the inner wall of the mist chamber, the inner wall of the lower cover, and the inner column of the hollow tube.

[0020] In the step 4, the spray chamber made of polytetrafluoroethylene is immersed in the sodium solution for 1-10 minutes and then washed with warm water.

[0021] The beneficial technical effects of the present invention are:

[0022] 1. The interior of the fog chamber is gyro-shaped, so that the aerosol particles can be thrown out at a uniform speed during the rotation process, ensuring that the aerosol is in a uniform small particle shape, thereby improving the accuracy of the test results;

[0023] The length of the inner column is close to the liquid outlet, which enables the droplets to flow out of the sample outlet before accumulating into large droplets, thereby improving the stability of the spray chamber.

[0024] 2. Sealing rings are provided at the joints of each component of the spray chamber to ensure the sealing of the spray chamber, thereby ensuring the stability of the air flow and pressure inside the spray chamber.

[0025] 3. The inner wall of the spray chamber adopts a new hydrophilic surface treatment method. It is first sandblasted with 40 mesh sand, and then the inner wall of the spray chamber is treated with sodium. This can prevent large particle aerosols from gathering into large water droplets on the inner wall, thereby improving the stability of the spray chamber.

[0026] 4. The detachable inner column design makes the spray chamber easier to manufacture and maintain, greatly reducing the cost of using the full-spectrum direct-reading ICP spectrometer and improving its practicality;

[0027] The inner column is designed as a detachable module. When the inner column is not needed, the aerosol entering the sample outlet is larger, which can improve the sensitivity of the element, effectively increase the element excitation intensity, and allow more aerosol to enter the plasma. When the inner column is added, it prevents the aerosol from entering the sample inlet without swirl, better removes large water droplets, and improves the stability of detection.

[0028] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 It is a schematic diagram of the internal structure of the mist chamber of the present invention;

[0031] Figure 3 It is a structural schematic diagram of the lower cover of the present invention;

[0032] Figure 4 is a cross-sectional view of the present invention;

[0033] Figure 5 It is an experimental comparison diagram of the present invention.

[0034] The accompanying drawings are marked as follows:

[0035] 100, spray chamber; 110, sample outlet; 120, sample outlet tube; 130, guide tube; 140, guide groove; 200, lower cover; 210, drain tube; 300, adapter; 400, inner column. DETAILED DESCRIPTION

[0036] In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the specific implementation methods of the present invention are further described in detail below in conjunction with the drawings and examples. The following examples are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0037] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so as to describe the embodiments of the present application described herein.

[0038] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships described in the embodiments and shown in the accompanying drawings, or are directions or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0039] like Figure 1 As shown, the present invention specifically relates to a novel hydrofluoric acid resistant mist chamber 100, comprising a mist chamber 100 with upper and lower openings, the upper opening of the mist chamber 100 being a sample outlet 110, and the sample outlet 110 being provided with a sample outlet tube 120; the lower opening of the mist chamber 100 being provided with a lower cover 200, and the lower cover 200 being provided with a liquid discharge tube 210 communicating with the inside of the mist chamber 100;

[0040] The sample outlet 110 and the liquid discharge pipe 210 are in the same axial direction, and a hollow tube inner column 400 detachably connected to the sample outlet 110 is provided in the same axial direction;

[0041] The side wall of the mist chamber 100 is provided with a guide tube 130 communicating with the inner wall of the mist chamber 100 , and the guide tube 130 is connected to the atomizer via an adapter 300 .

[0042] It should be noted that, the upper end of the spray chamber 100 is connected to a sample outlet tube 120 through a sample outlet 110, and the aerosol enters the next device through the sample outlet 110 and the sample outlet tube 120. The lower end of the spray chamber 100 is provided with a lower cover 200, which can seal the spray chamber 100, and the lower cover 200 is provided with a drain pipe 210 to recover large water droplets formed during the atomization process through the drain pipe 210.

[0043] The atomizer (not shown) is connected to the spray chamber 100 via the adapter 300 and the guide tube 130. The atomizer is a relatively mature component in the prior art, and therefore, the principle of the atomizer is no longer described in detail. The aerosol generated by the atomizer rotates along the inner wall of the spray chamber 100, and the large droplets, relatively large droplets or not too large droplets in the aerosol are thrown out through the rotation, so that only uniform small droplets remain in the aerosol.

[0044] The aerosol enters the mist chamber 100 through the guide tube 130 and rotates along the inner wall of the mist chamber 100. During the rotation, large water droplets in the aerosol are thrown to the inner wall of the mist chamber 100. The aerosol containing uniform small water droplets has low mass and is more easily carried by the airflow to pass through the inner column 400, the sample outlet 110 and the sample outlet tube 120 in sequence to enter the next device.

[0045] The aerosol containing large water droplets is recovered through the discharge pipe 210. The discharge pipe 210 is connected to a peristaltic pump, which can only discharge a fixed volume of liquid per minute. The ejected liquid will form large droplets again in the external pipe connected to the discharge pipe 210.

[0046] In addition, the inner column 400 is detachably connected. When the inner column 400 is not needed, aerosol enters the sample outlet 110 to a greater extent, which can improve the sensitivity of the element, effectively improve the element excitation intensity, and more aerosol enters the plasma; when the inner column 400 is added, aerosol enters the sample outlet 110 to a lesser extent, and large water droplets are better removed, thereby improving the stability of detection.

[0047] The inner diameter of the upper opening is smaller than that of the lower opening. The upper opening is used for sample discharge, and the lower opening is used for sealing with the lower cover 200.

[0048] The inner wall of the mist chamber 100 is a gyro-shaped structure, which can effectively ensure that the speed of the aerosol is more uniform during the rotation process, so that the aerosol particles containing large water droplets can be better thrown out, ensuring that the aerosol still has uniform small particles, thereby improving the accuracy of the detection results.

[0049] The mist chamber 100 is provided with a guide groove 140 , and the guide groove 140 extends along the top of the mist chamber 100 to the inner wall of the mist chamber 100 . The guide groove 140 provided on the inner wall of the mist chamber 100 is located at one side of the guide tube 130 .

[0050] The aerosol enters the mist chamber 100 from the guide tube 130 , rotates along the inner wall of the mist chamber 100 , and finally gathers at the guide groove 140 , through which the aerosol with large droplets is intercepted and guided.

[0051] The inner diameter of the sample outlet 110 is larger than that of the liquid discharge tube 210 . The setting of the inner diameter of the sample outlet 110 can discharge small-particle aerosol uniformly. The liquid discharge tube 210 can only discharge a fixed amount of liquid each time due to the existence of an external peristaltic pump.

[0052] One end of the inner column 400 is plugged into the sample outlet 110 , and the other end of the inner column 400 is located directly above the liquid discharge tube 210 . The other end of the inner column 400 is provided with a plurality of notches, which can effectively remove large-particle aerosols.

[0053] The lower cover 200 is located at one end of the mist chamber 100 and has a conical structure so as to collect the large water droplets diverted and discharge a part of them through the drain pipe 210 .

[0054] A novel method for preparing a hydrofluoric acid resistant mist chamber 100 comprises the following steps:

[0055] Step 1, selecting polytetrafluoroethylene as the main material of the spray chamber 100;

[0056] Step 2, preparing the interior of the mist chamber 100 into a gyro-shaped structure;

[0057] Step 3, use 40 mesh sand to sandblast the inner wall of the mist chamber 100, the inner wall of the lower cover 200, and the inner column 400 of the hollow tube;

[0058] Step 4: perform sodium treatment on the inner wall of the mist chamber 100, the inner wall of the lower cover 200, and the inner column 400 of the hollow tube.

[0059] The spray chamber 100 made of polytetrafluoroethylene is immersed in sodium solution for 1-10 minutes and then washed with warm water to form a carbonized layer on the inner wall of the spray chamber 100, which effectively improves the hydrophilicity of the inner wall and can more thoroughly eliminate the problem of large particle aerosols gathering on the inner wall to form large water droplets, thereby improving the stability of the spray chamber 100 during ICP analysis.

[0060] like Figure 5 As shown, the content of the standard solution was tested on I CP-OES using a general sodium-treated hydrofluoric acid fog chamber, a new sodium-treated hydrofluoric acid fog chamber, and an imported hydrofluoric acid fog chamber under the same conditions. The test focus indicators are the value and fluctuation of the relative standard deviation. The lower the value and fluctuation, the better.

[0061] Experimental data proves that the fluctuation of hydrofluoric acid resistant spray chamber using sodium process is significantly improved compared with the existing spray chamber; compared with imported spray chambers, we can also reach the advanced level of foreign countries through structural and process improvements.

[0062] The above embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the aforementioned embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the protection scope of the present invention.

Claims

1. A new type of hydrofluoric acid resistant mist chamber, characterized in that: The invention comprises a mist chamber (100) with upper and lower openings, wherein the upper opening of the mist chamber (100) is a sample outlet (110), and the sample outlet (110) is provided with a sample outlet tube (120); the lower opening of the mist chamber (100) is provided with a lower cover (200), and the lower cover (200) is provided with a liquid discharge tube (210) communicating with the mist chamber (100); The sample outlet (110) and the liquid discharge pipe (210) are in the same axial direction, and a hollow tube inner column (400) detachably connected to the sample outlet (110) is provided in the same axial direction; The side wall of the mist chamber (100) is provided with a guide tube (130) communicating with the inner wall of the mist chamber (100), and the guide tube (130) is connected to the atomizer via an adapter (300).

2. A novel hydrofluoric acid resistant mist chamber according to claim 1, characterized in that: The inner diameter of the upper opening is smaller than the inner diameter of the lower opening.

3. A novel hydrofluoric acid resistant mist chamber according to claim 1, characterized in that: The inner wall of the mist chamber (100) is a gyro-shaped structure.

4. A novel hydrofluoric acid resistant mist chamber according to claim 3, characterized in that: The mist chamber (100) is provided with a guide groove (140), and the guide groove (140) extends along the top of the mist chamber (100) to the inner wall of the mist chamber (100).

5. A novel hydrofluoric acid resistant mist chamber according to claim 4, characterized in that: The guide groove (140) provided on the inner wall of the mist chamber (100) is located on one side of the guide tube (130).

6. A novel hydrofluoric acid resistant mist chamber according to claim 1, characterized in that: The inner diameter of the sample outlet (110) is greater than the inner diameter of the liquid discharge pipe (210).

7. A novel hydrofluoric acid resistant mist chamber according to claim 1, characterized in that: One end of the inner column (400) is plugged into the sample outlet (110), and the other end of the inner column (400) is located directly above the liquid discharge pipe (210), and a plurality of notches are provided at the other end of the inner column (400).

8. A novel hydrofluoric acid resistant mist chamber according to claim 1, characterized in that: The lower cover (200) is located at one end of the mist chamber (100) and has a conical structure.

9. A method for preparing a novel hydrofluoric acid mist resistant chamber according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1, selecting polytetrafluoroethylene as the main material of the mist chamber (100); Step 2, preparing the interior of the mist chamber (100) into a gyro-shaped structure; Step 3, using 40 mesh sand to perform sandblasting on the inner wall of the mist chamber (100), the inner wall of the lower cover (200), and the inner column of the hollow tube (400); Step 4: The inner wall of the mist chamber (100), the inner wall of the lower cover (200), and the inner column of the hollow tube (400) are subjected to sodium treatment.

10. The method for preparing a novel hydrofluoric acid resistant mist chamber according to claim 9, characterized in that: In step 4, the mist chamber (100) made of polytetrafluoroethylene is immersed in the sodium solution for 1-10 minutes and then washed with warm water.

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