Rotary disc diluter

Abstract

The invention discloses a rotary disc diluter, and relates to the technical field of gas dilution, the rotary disc diluter comprises a glass box, one end of the glass box is provided with a sample gas pipe and a dilution gas pipe, the other end of the glass box is provided with a gas outlet pipe, and the glass box is internally provided with a gas distribution member and a mixing member; the gas distributing piece comprises a gas collecting cylinder and a gas distributing pipe arranged at one end of the gas collecting cylinder; the gas collecting cylinder is communicated with the sample gas pipe and the dilution gas pipe; the mixing piece comprises a disc rotationally arranged in the glass box, and a nanoscale through hole is annularly formed in the disc and located at the outlet end of the gas distributing pipe. By means of the nanoscale through holes annularly formed in the disc, sample gas and diluent gas make full contact when passing through the disc and are matched with the rotating disc, the shear mixing effect is further enhanced, the precision error caused by uneven mixing is reduced, then the dilution precision is improved, and through combination of PID constant-temperature control and a pressure compensator in a control system, the dilution precision is improved. The problem of single application scene is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas dilution, in particular to a rotating disc diluter. Background Art

[0002] In the fields of analytical chemistry, environmental monitoring, industrial gas detection, etc., the application of "sample gas" and "dilution gas" is very common. The mixed dilution of the two is mainly used to meet the accuracy, instrument compatibility and safety requirements of gas sample analysis;

[0003] The existing method mainly uses a jet diluter to mix and dilute the "sample gas" and "dilution gas". It is a device that uses the principle of high-speed jet to achieve gas dilution. Its core working mechanism is to use the jet beam formed by high-pressure gas to generate a negative pressure effect in a specific flow channel, entraining the surrounding gas to be diluted and the sample gas and mixing them, thereby achieving the purpose of dilution;

[0004] However, existing technologies, such as jet diluters, utilize a fixed jet orifice structure, which presents the following issues. First, low precision: gas mixing relies on the jet effect generated by negative pressure within the orifice, which is susceptible to flow rate and pressure fluctuations. Poor mixing uniformity results in low mixing and dilution accuracy. Second, limited application scenarios: The fixed orifice diameter and mixing method cannot be adjusted based on sample gas concentration, composition, and other characteristics. This results in poor adaptability to different gases, leading to a single compatible gas. To address this issue, we have improved the aforementioned existing technology based on actual usage. Summary of the Invention

[0005] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the title of the invention of this application to avoid blurring the purpose of this section, the abstract of the specification and the title of the invention, and such simplifications or omissions cannot be used to limit the scope of the invention.

[0006] In view of the above problems and / or the problems existing in the prior art, the present invention is proposed.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A rotating disc diluter comprises a glass box, one end of which is provided with a sample gas tube and a dilution gas tube, the other end of which is provided with an air outlet tube, and a gas distributor and a mixing element are provided inside the glass box; the gas distributor comprises a gas collecting cylinder and a gas distributor tube provided at one end of the gas collecting cylinder, and the gas collecting cylinder is connected to the sample gas tube and the dilution gas tube; the mixing element comprises a disc rotatably arranged in the glass box, and the disc is provided with a nanoscale through hole in an annular shape, and the nanoscale through hole is located at the outlet end of the gas distributor tube.

[0009] Furthermore, a base is fixed to the bottom of the glass box, and a control system is provided at one end of the glass box. The control system is a PID constant temperature control and a pressure compensator.

[0010] Furthermore, a mixing chamber and an air separation chamber are provided in the glass box, an electric heating wire is fixed to the inner wall of the mixing chamber, and a temperature sensor and a pressure sensor are also fixed to the inner wall of the mixing chamber.

[0011] Furthermore, a sealed bearing is fixed to the inner wall of the glass box, a gear ring is welded to the inner ring of the sealed bearing, and one side of the gear ring is fixed to the disc for driving the disc to rotate.

[0012] Furthermore, a servo motor is fixed to the bottom wall of the glass box via a mounting frame, a gear is fixed to the output end of the servo motor via a coupling, and the gear is engaged with the gear ring to drive the gear ring to rotate the disc.

[0013] Furthermore, the outer surface of the disc is integrally provided with an ear block, and the ear block is fixed to the gear ring by bolts.

[0014] Furthermore, flow valves are provided in both the sample gas pipe and the dilution gas pipe.

[0015] Furthermore, a one-way valve is provided in the air outlet pipe.

[0016] Furthermore, one end of the gas collecting cylinder is welded with the sample gas pipe and the dilution gas pipe and is connected to each other, and the other end of the gas collecting cylinder is annularly fixed and connected to the nano-scale through hole.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. Precision: The nanometer-scale through-holes arranged in an annular pattern inside the disc allow the sample gas and the dilution gas to fully contact each other when passing through. Combined with the rotating disc, this further enhances the shear mixing effect, reduces the precision error caused by uneven mixing, and thus improves the dilution accuracy.

[0019] 2. Application scenarios: The temperature sensor and pressure sensor in the mixing chamber of the glass box monitor data in real time. Combined with the PID constant temperature control and pressure compensator in the control system, the temperature and pressure are precisely regulated to meet the dilution requirements of sample gases with different concentrations and components. It can meet the requirements of multiple gas outputs, broaden the scope of use of the equipment, and effectively solve the problem of the single application scenario of the jet diluter.

[0020] 3. The discs can be removed and replaced with nano-scale through-holes of varying pore sizes, allowing the diluter to flexibly adapt to sample gases of varying viscosities and molecular weights, as well as to dilution ratio requirements. Furthermore, by replacing the discs with different pore sizes, a smaller pore size can be used to enhance shear dispersion for high-concentration samples, while also improving the flexibility of the device.

[0021] Other features and advantages of the present application will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings.

[0022] The technical solution of the present application is further described in detail below through the accompanying drawings and examples. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is another perspective schematic diagram of the present invention;

[0026] Figure 3 It is a front view schematic diagram of the present invention;

[0027] Figure 4 A schematic diagram of a mixing element of the present invention;

[0028] Figure 5 It is a schematic diagram of the gas distribution component of the present invention;

[0029] Figure 6 For the present invention Figure 2 The enlarged schematic diagram at a in the middle;

[0030] Figure: 1. Glass box; 2. Mixing chamber; 3. Control system; 4. Sample gas pipe; 5. Dilution gas pipe; 6. Gas distributor; 61. Gas collecting cylinder; 62. Gas distributor; 7. Mixing element; 71. Disc; 72. Nano-scale through-hole; 73. Ear block; 8. Gas outlet pipe; 9. Gas distributor chamber; 10. Sealed bearing; 11. Gear ring; 12. Servo motor; 13. Gear; 14. Flow valve; 15. One-way valve; 16. Electric heating wire; 17. Temperature sensor; 18. Pressure sensor; 19. Base. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] Next, the present invention is described in detail with reference to schematic diagrams. For ease of illustration, when describing embodiments of the present invention, cross-sectional views illustrating device structures may be partially enlarged and not to scale. Furthermore, these schematic diagrams are merely illustrative and should not limit the scope of protection of the present invention. Furthermore, in actual production, three-dimensional dimensions, including length, width, and depth, should be included.

[0034] Furthermore, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0035] See also Figures 1 to 6 The present invention provides a technical solution: a rotating disc diluter, comprising a glass box 1, a sample gas pipe 4 and a dilution gas pipe 5 are provided at one end of the glass box 1, an outlet pipe 8 is provided at the other end of the glass box 1, and a gas separator 6 and a mixing element 7 are provided inside the glass box 1; the gas separator 6 comprises a gas collecting cylinder 61 and a gas separator 62 provided at one end of the gas collecting cylinder 61, and the gas collecting cylinder 61 is connected to the sample gas pipe 4 and the dilution gas pipe 5; the mixing element 7 comprises a disc 71 rotatably arranged in the glass box 1, and a nanoscale through hole 72 is annularly provided in the disc 71, and the nanoscale through hole 72 is located at the outlet end of the gas separator 62.

[0036] refer to Figure 1 A base 19 is fixed to the bottom of the glass box 1, and a control system 3 is installed at one end of the glass box 1. The control system 3 includes a PID constant temperature control, a pressure compensator, an IC chip, and a display. It should be noted that the PID constant temperature controller is an Omron E5CC series (supports self-tuning function, temperature control accuracy of ±0.5°C, has an RS485 communication interface, and can communicate with the S7-1200 PLC to achieve temperature closed-loop control). The pressure compensator is a Rosemount 3051S series pressure transmitter (range 0-100kPa, accuracy of ±0.04%, with HART communication protocol, and can be used with the Siemens S7-1200 to implement pressure compensation algorithms).

[0037] refer to Figure 1The glass box 1 is provided with a mixing chamber 2 and a gas distribution chamber 9. An electric heating wire 16 is fixed to the inner wall of the mixing chamber 2. A temperature sensor 17 and a pressure sensor 18 are also fixed to the inner wall of the mixing chamber 2. The temperature sensor 17 is a Pt100 platinum resistance temperature sensor (Class A accuracy, measuring range -50 to 200°C). The pressure sensor 18 is a Druck PTX1400 series (range 0-1 MPa, accuracy ±0.065% FS). The electric heating wire 16 is a Cr20Ni80 nickel-chromium alloy heating wire (power 1000W, temperature resistance 1100°C).

[0038] refer to Figure 3 A sealed bearing 10 is fixed to the inner wall of the glass box 1. A gear ring 11 is welded to the inner ring of the sealed bearing 10. One side of the gear ring 11 is fixed to the disc 71 to drive the disc 71 to rotate. The sealed bearing 10 model is: SKF6206-2RS1 deep groove ball bearing (inner diameter 30mm, outer diameter 62mm, double-sided seal).

[0039] refer to Figure 3 A servo motor 12 is fixed to the bottom wall of the glass box 1 via a mounting bracket. A gear 13 is fixed to the output end of the servo motor 12 via a coupling. The gear 13 engages with the gear ring 11 to drive the gear ring 11 to rotate the disc 71. Servo motor 12 model: Panasonic MINASA6 series MSMD042G1U (rated power 400W, rated speed 3000r / min).

[0040] refer to Figure 4 and Figure 6 The outer surface of the disk 71 is integrally provided with an ear block 73 and the ear block 73 is fixed to the gear ring 11 by bolts to facilitate replacement of the disk 71 with nano-scale through holes 72 of different apertures.

[0041] refer to Figure 1 Flow valves 14 are provided in both the sample gas pipe 4 and the dilution gas pipe 5. Flow valve 14: Bronkhorst EL-FLOW series M151C (range 0-10 L / min, accuracy ±0.5% FS).

[0042] refer to Figure 1 A one-way valve 15 is provided in the air outlet pipe 8. One-way valve 15: Parker series HFT08-1 (stainless steel material, applicable pressure 0-10 bar).

[0043] refer to Figure 1 One end of the gas collecting cylinder 61 is welded with the sample gas pipe 4 and the dilution gas pipe 5 and is connected to each other, and the other end of the gas collecting cylinder 61 is annularly fixed and connected to the nano-scale through hole 72.

[0044] It should be noted that the system operating pressure of the device is 0.1-0.3 MPa. This range ensures that the gas forms a stable jet when passing through the nano-scale through-hole 72 and the flow valve 14 meets the accuracy standard. When the system pressure is lower than 0.08 MPa, the pressure compensator needs to be activated to replenish air to avoid weakening the mixing effect. The recommended PID constant temperature control range is 20-60°C, and the adaptation temperature of different gases is as follows: dry and clean gas (such as air, nitrogen) is 25-30°C, wet gas needs to be heated to 10-20°C above the dew point (40-60°C) to prevent condensation, high viscosity gas (such as SF6) is 35-50°C to reduce viscosity, flammable and explosive gas is ≤40°C to ensure safety, and corrosive gas is 30-45°C to take into account material tolerance. When the working pressure exceeds 0.25 MPa, the PID controller automatically increases the temperature by 5-10°C to compensate for the change in gas density. The temperature and pressure sensor monitors the data in real time and corrects the flow valve 14 opening according to the ideal gas state equation through the IC chip to ensure the dilution ratio accuracy within ±1%;

[0045] The aperture adaptation strategy of the nano-scale through-hole 72 is as follows: for low-viscosity gases (such as air and nitrogen), a 50-100nm aperture is selected to enhance the shear dispersion effect; for medium-viscosity gases (such as CO2 and methane), a 100-200nm aperture is used to balance resistance and mixing efficiency; for high-viscosity or particulate-containing sample gases (such as industrial waste gas), a 200-500nm aperture is used to prevent clogging; for high-precision dilution requirements (such as ppm-level standard gas preparation), a small aperture of 50-80nm is preferred to enhance molecular diffusion, while a disc speed of ≤300r / min is used; when the sample gas concentration fluctuates greatly, the dilution ratio is dynamically adjusted by replacing discs with different apertures (such as a combination of 100nm and 200nm) in combination with the flow valve 14 to ensure that the dilution accuracy error is ≤±1%;

[0046] The rotation speed of the disc 71 needs to be adjusted in coordination with the viscosity, concentration, composition characteristics of the sample gas and the aperture of the nano-scale through-hole 72 to achieve the best dilution accuracy: for dry, clean, low-viscosity gases (such as air and nitrogen), a rotation speed of 50-100 r / min is recommended. At this time, the gas forms a laminar flow state when passing through the 50-100 nm aperture. The shear force generated by the rotation of the disc 71 can make the gas molecules diffuse evenly, avoiding the turbulent energy loss caused by high rotation speed. In conjunction with the flow valve 14 to control the pressure of 0.1-0.2 MPa, the dilution ratio error is ≤±0.5%;

[0047] When processing medium-viscosity gases (such as CO2 and methane), the speed is increased to 100-200 r / min, and the pore size is 100-200 nm. The internal friction between molecules is overcome by increasing the fluid disturbance intensity. For example, the viscosity of methane at 20°C is 11.6 μPa·s. At a speed of 150 r / min, the Reynolds number Re at the outlet of the nano-scale through-hole 72 can be maintained at 200-500, ensuring the stability of the mixed laminar flow boundary and the dilution accuracy within ±1%. For high-viscosity gases (such as SF6 and waste gas containing heavy hydrocarbons), a speed of 200-300 r / min is required. The rotation speed is controlled at 150-250 r / min and the pore size is 200-500 nm. By strengthening the centrifugal force effect of the rotating disk, the gas generates secondary flow mixing within the nano-scale through-holes 72. For example, SF6 has a viscosity of 12.8 μPa·s at 50°C. At 250 r / min, the mixing time can be shortened to within 1.5 seconds, avoiding concentration stratification caused by too slow a flow rate. For humid gases (10°C above the dew point), the rotation speed is controlled at 150-250 r / min. The centrifugal force generated by the rotation assists in the dispersion of water vapor and prevents condensation droplets from clogging the nano-scale through-holes 72.

[0048] At the same time, heating at 40 to 60°C is used to maintain gas fluidity; when handling flammable and explosive gases (such as hydrogen and acetylene), the speed is limited to ≤150r / min. The low speed reduces heat generated by gas friction, and the inner wall of the anti-static glass box 1 is used to ensure safe mixing; when the sample gas contains particulate matter (such as industrial waste gas), a speed of 180 to 220r / min is selected, and the inertial force generated by the rotation is used to make the particulate matter pass through the aperture with the air flow, avoiding particle deposition caused by high speed. In addition, the speed needs to be linked with pressure compensation: when the system pressure exceeds 0.25MPa, the PID controller automatically reduces the speed by 10% to 15% to compensate for the flow rate fluctuation caused by the increase in gas density under high pressure. Through the precise speed regulation of the servo motor 12 (Panasonic MINASA6), the speed error under different working conditions is ≤±5r / min, ensuring the dynamic stability of the dilution ratio.

[0049] Working principle: When the rotating disc diluter is working, the sample gas and the dilution gas enter the gas collecting cylinder 61 through the sample gas pipe 4 and the dilution gas pipe 5 respectively. The flow valves 14 in the sample gas pipe 4 and the dilution gas pipe 5 can accurately control the flow of the two gases to achieve the preset dilution ratio;

[0050] The mixed gas reaches the nano-scale through-hole 72 of the disk 71 through the gas distribution pipe 62. At the same time, the control system 3 (including PID constant temperature control, pressure compensator, IC chip, and display) starts the servo motor 12. The gear 13 at its output end meshes with the gear ring 11, driving the gear ring 11 on the inner ring of the sealed bearing 10 to rotate. This in turn rotates the disk 71 fixed to the gear ring 11 by the lug 73, and the nano-scale through-hole 72 rotates accordingly, promoting the thorough mixing of the sample gas and the dilution gas as they pass through the nano-scale through-hole 72.

[0051] The mixed gas enters the mixing chamber 2. The control system 3 maintains a constant temperature in the mixing chamber 2 through the electric heating wire 16. The temperature sensor 17 and pressure sensor 18 monitor the temperature and pressure data in the chamber in real time and feed it back to the control system 3. After analysis and processing, the control system 3 adjusts the pressure through the pressure compensator to ensure a stable mixing process. Finally, the mixed gas is discharged through the one-way valve 15 in the outlet pipe 8. The one-way valve 15 prevents gas backflow and ensures stable flow. Throughout the process, the display of the control system 3 can display operating parameters such as temperature and pressure in real time, making it easy for operators to monitor.

[0052] It will be appreciated that in the development of any actual embodiment, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will, for those of ordinary skill having the benefit of this disclosure, be a routine undertaking of design, fabrication, and production without undue experimentation.

[0053] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A rotating disc diluter, comprising a glass box (1), wherein one end of the glass box (1) is provided with a sample gas pipe (4) and a dilution gas pipe (5), and the other end of the glass box (1) is provided with an outlet pipe (8), characterized in that: The glass box (1) is provided with a gas separation element (6) and a mixing element (7); The gas distribution member (6) comprises a gas collecting cylinder (61) and a gas distribution pipe (62) arranged at one end of the gas collecting cylinder (61), and the gas collecting cylinder (61) is in communication with the sample gas pipe (4) and the dilution gas pipe (5); The mixing element (7) comprises a disc (71) rotatably arranged in the glass box (1), and a nano-scale through hole (72) is annularly arranged in the disc (71), and the nano-scale through hole (72) is located at the outlet end of the gas distribution pipe (62).

2. A rotating disc diluter according to claim 1, characterized in that: A base (19) is fixed to the bottom of the glass box (1), and a control system (3) is provided at one end of the glass box (1). The control system (3) is a PID constant temperature control and pressure compensator.

3. The rotating disc diluter according to claim 2, characterized in that: A mixing chamber (2) and an air separation chamber (9) are provided in the glass box (1); an electric heating wire (16) is fixed to the inner wall of the mixing chamber (2); and a temperature sensor (17) and a pressure sensor (18) are also fixed to the inner wall of the mixing chamber (2).

4. The rotating disc diluter according to claim 1, characterized in that: A sealed bearing (10) is fixed to the inner wall of the glass box (1), a gear ring (11) is welded to the inner ring of the sealed bearing (10), and one side of the gear ring (11) is fixed to the disc (71) for driving the disc (71) to rotate.

5. The rotating disc diluter according to claim 4, characterized in that: A servo motor (12) is fixed to the bottom wall of the glass box (1) via a mounting frame, a gear (13) is fixed to the output end of the servo motor (12) via a coupling, and the gear (13) is engaged with the gear ring (11) to drive the gear ring (11) to drive the disc (71) to rotate.

6. The rotating disc diluter according to claim 5, characterized in that: An ear block (73) is integrally provided on the outer surface of the disc (71), and the ear block (73) is fixed to the gear ring (11) via bolts.

7. The rotating disc diluter according to claim 1, characterized in that: Flow valves (14) are provided in both the sample gas pipe (4) and the dilution gas pipe (5).

8. The rotating disc diluter according to claim 1, characterized in that: A one-way valve (15) is provided in the air outlet pipe (8).

9. The rotating disc diluter according to claim 1, characterized in that: One end of the gas collecting cylinder (61) is welded to the sample gas pipe (4) and the dilution gas pipe (5) and is in communication with each other. The other end of the gas collecting cylinder (61) is annularly fixed and in communication with a nanometer-scale through hole (72).

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