Dry dispersion device of laser particle analyzer
By designing a combined structure of the mixing chamber, feed chamber, intake chamber and Venturi chamber in a dry laser particle size meter, the particle dispersion is achieved by using high-speed airflow and cavity wall collision, the measurement of small particle deviations and the traditional dry dispersion device is solved. The problem of large particles blockage improves measurement accuracy and efficiency.
Patent Information
- Application Number
- CN202420077654.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-11
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-01-11
AI Technical Summary
Traditional dry laser particle size meter dispersion devices are prone to deviations when measuring small particles, and large particles may block the measurement window, resulting in interruption in measurement and inaccurate data.
A dry dispersion device including a mixing chamber, a feed chamber, an intake chamber and a Venturi chamber was designed to oscillate the sample particles back and forth in the Venturi chamber through a high-speed airflow, ensuring that the particles and the cavity wall fully collide, thereby achieving dispersion. , and prevent clogging and bonding by design of guide cavity and air nozzle.
It effectively prevents sample particles from clogging and bonding, improves testing efficiency and data accuracy, and ensures that all particles can enter the measurement window for accurate measurement.
Smart Images
Figure CN222131535U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of laser particle size analyzers, in particular to a dry dispersion device of a laser particle size analyzer. Background Art
[0002] Laser particle size analyzer is an instrument that tests particle size distribution based on the physical phenomenon that particles can cause laser scattering. It is divided into wet measurement system and dry measurement system according to the dispersion system. The wet measurement system usually uses water as the medium to disperse by ultrasonic wave. The sample particles and water are mixed evenly through the wet sampler and then sent into the measurement window of the particle size analyzer for measurement. The dry measurement system uses compressed air as the dispersion medium. The dispersion effect is related to the pressure setting. The particles are completely dispersed through the collision between particles and the collision between particles and the tube wall. Since the dry measurement system uses dry sample particles for sampling and measurement, it is simple to operate, does not need to add liquid, and is not easy to be contaminated. It has unique advantages in the field of water-soluble sample particle measurement.
[0003] The dry method measurement system of the laser particle size analyzer is generally composed of a vibration feeding device, a control device and a dispersion device. The control device controls the amount of sample particles by controlling the vibration intensity of the vibration feeding device. After the sample particles enter the dispersion device, they collide with the tube wall to achieve dispersion, thereby measuring accurate results.
[0004] The traditional dry dispersion device uses the vibrating feeding device in the dry sampling system to transport the sample particles to the free fall area of the sample particles. The sample particles fall into the conical hopper. At this time, compressed air enters from the inlet, and after a 90-degree turn, it sprays downward from the air intake nozzle. The compressed air carries the sample particles to disperse in the collision dispersion area. After dispersion, it is sent to the laser particle size analyzer dry measurement window for measurement through the transmission pipe. However, small particles will float around when falling in the free fall area, and the fine particles will not enter the measurement window, resulting in a large deviation in the measurement results. In addition, the air intake nozzle is set in the center of the conical hopper. When falling, large particles will block the discharge hole of the conical hopper, affecting the smooth measurement. Utility Model Content
[0005] The purpose of the utility model is to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a laser particle size analyzer dry dispersion device, which can prevent sample particles from sticking together, improve test efficiency, and thus ensure data accuracy.
[0006] The laser particle size analyzer dry dispersion device according to the embodiment of the utility model comprises a mixing chamber; a feed chamber, the feed chamber is located directly above the mixing chamber, the output end of the feed chamber is connected to the mixing chamber, and the sample particles enter the mixing chamber through the feed chamber; an air inlet chamber, the air inlet chamber is horizontally arranged, the output end of the air inlet chamber is connected to the mixing chamber, and the high-speed airflow enters the mixing chamber through the air inlet chamber; a Venturi chamber, the Venturi chamber and the air inlet chamber are coaxially arranged in the horizontal direction, the Venturi chamber comprises a throat chamber, the input end of the throat chamber is connected to the output end of the mixing chamber, and the throat chamber is used to disperse the sample particles entering from the mixing chamber.
[0007] The laser particle size analyzer dry dispersion device according to the embodiment of the utility model has at least the following beneficial effects: sample particles enter the mixing chamber through the feed chamber, and compressed air enters the mixing chamber through the air intake chamber. Under the action of the air intake chamber, the flow rate of the compressed air gradually increases, and the high-speed airflow enters the mixing chamber, and blows the free-falling sample particles into the Venturi chamber to oscillate back and forth. After the sample particles fully collide and rub with the cavity wall of the Venturi chamber, the dispersion effect is achieved, and finally they are blown out of the Venturi chamber to the measurement window of the laser particle size analyzer for measurement. As a result, the entire traversal process of the sample particles is not blocked by any structure, which effectively prevents the interruption of measurement due to blockage of sample particles, avoids the adhesion of sample particles, thereby improving the test efficiency and ensuring the accuracy of the measurement data.
[0008] According to some embodiments of the utility model, the Venturi chamber includes a diffusion chamber, the input end of the diffusion chamber is connected to the output end of the throat chamber, the diffusion chamber and the throat chamber are coaxially arranged, the diffusion chamber is located on the opposite side of the throat chamber and the mixing chamber, the axial cross-sectional area of the diffusion chamber gradually increases in the direction away from the throat chamber, and the diffusion chamber can prevent sample particles from sticking together.
[0009] According to some embodiments of the utility model, the throat cavity is in the shape of a horizontally arranged long circular tube, and the high-speed airflow oscillates back and forth in the narrow throat cavity, so that the sample particles fully collide with the cavity wall of the throat cavity to achieve a dispersion effect.
[0010] According to some embodiments of the present invention, a guide chamber is further included, which is coaxially arranged with the feed chamber, the guide chamber is located between the feed chamber and the mixing chamber, the feed chamber is connected with the mixing chamber through the guide chamber, and the guide chamber is used to guide sample particles into the mixing chamber.
[0011] According to some embodiments of the utility model, the air inlet chamber includes: an air channel, which is horizontally arranged; an air nozzle, the output end of the air nozzle is connected to the mixing chamber, the air nozzle and the air channel are coaxially arranged, the input end of the air nozzle is connected to the output end of the air channel, the air channel is located on the opposite side of the air nozzle and the mixing chamber, and the axial cross-sectional area of the air nozzle gradually decreases in the direction approaching the mixing chamber.
[0012] According to some embodiments of the utility model, the mixing chamber includes: an expansion chamber, which is connected to the output end of the gas nozzle, and the axial cross-sectional area of the expansion chamber gradually increases in the direction away from the gas nozzle; and a contraction chamber, which is coaxially arranged with the expansion chamber, the input end of the contraction chamber is connected to the output end of the expansion chamber, the contraction chamber is located on the opposite side of the expansion chamber and the gas nozzle, and the axial cross-sectional area of the contraction chamber gradually decreases in the direction away from the expansion chamber.
[0013] According to some embodiments of the present invention, the guide cavity is communicated with the expansion cavity.
[0014] According to some embodiments of the present invention, the cross-sectional area of the output end of the gas nozzle is smaller than the axial cross-sectional area of the throat cavity.
[0015] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The utility model is further described below in conjunction with the accompanying drawings and embodiments;
[0017] Figure 1 This is a schematic structural diagram of a laser particle size analyzer dry dispersion device according to an embodiment of the utility model;
[0018] Figure 2 for Figure 1 Cross-sectional view in .
[0019] Reference numerals:
[0020] Mixing chamber 100, expansion chamber 110, contraction chamber 120;
[0021] Feed chamber 200;
[0022] Air inlet cavity 300, air channel 310, air nozzle 320;
[0023] Venturi chamber 400, throat chamber 410, diffusion chamber 420;
[0024] Guide cavity 500. DETAILED DESCRIPTION
[0025] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.
[0026] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0027] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a first or second description, it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.
[0028] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.
[0029] refer to Figures 1 to 2 The laser particle size analyzer dry dispersion device according to the embodiment of the utility model is described.
[0030] like Figure 1 to Figure 2 As shown, the laser particle size analyzer dry dispersion device includes a mixing chamber 100; a feed chamber 200, which is located directly above the mixing chamber 100, and the output end of the feed chamber 200 is connected to the mixing chamber 100, and the sample particles enter the mixing chamber 100 through the feed chamber 200; an air inlet chamber 300, which is horizontally arranged, and the output end of the air inlet chamber 300 is connected to the mixing chamber 100, and the high-speed airflow enters the mixing chamber 100 through the air inlet chamber 300; a venturi chamber 400, which is coaxially arranged with the air inlet chamber 300 in the horizontal direction, and the venturi chamber 400 includes a throat chamber 410, and the input end of the throat chamber 410 is connected to the output end of the mixing chamber 100, and the throat chamber 410 is used to disperse the sample particles entering from the mixing chamber 100.
[0031] like Figure 1 and Figure 2As shown, the feed chamber 200 is arranged in a funnel shape above the mixing chamber 100, and its output end is arranged downward and communicated with the mixing chamber 100; the air intake chamber 300 is arranged on the right side of the mixing chamber 100, and its output end is arranged to the left and communicated with the mixing chamber 100; the venturi chamber 400 is arranged on the left side of the mixing chamber 100, and communicated with the mixing chamber 100 through the input end arranged to the right. Specifically, the air intake chamber 300, the mixing chamber 100 and the venturi chamber 400 are coaxially arranged in sequence from right to left, and their axes are perpendicular to the axis of the feed chamber 200. The sample particles enter the mixing chamber 100 through the feed chamber 200, and the compressed air enters the mixing chamber 100 through the air inlet chamber 300. Under the action of the air inlet chamber 300, the flow rate of the compressed air gradually increases, and the high-speed airflow enters the mixing chamber 100, and blows the free-falling sample particles into the Venturi chamber 400 to oscillate back and forth. After the sample particles fully collide and rub with the cavity wall of the Venturi chamber 400, they achieve a dispersion effect, and finally blow out of the Venturi chamber 400 to the measurement window of the laser particle size analyzer for measurement. As a result, the entire traversal process of the sample particles is not blocked by any structure, which effectively prevents the interruption of measurement due to blockage of sample particles, avoids the adhesion of sample particles, thereby improving the test efficiency and ensuring the accuracy of the measurement data.
[0032] In some specific embodiments of the present invention, the Venturi chamber 400 includes a diffusion chamber 420, the input end of the diffusion chamber 420 is connected to the output end of the throat chamber 410, the diffusion chamber 420 is coaxially arranged with the throat chamber 410, the diffusion chamber 420 is located on the opposite side of the throat chamber 410 and the mixing chamber 100, the axial cross-sectional area of the diffusion chamber 420 gradually increases in the direction away from the throat chamber 410, and the diffusion chamber 420 can prevent sample particles from sticking together.
[0033] like Figure 2 As shown, the Venturi chamber 400 includes a throat chamber 410 and a diffusion chamber 420, wherein the diffusion chamber 420 is located on the left side of the throat chamber 410, and the mixing chamber 100 is located on the right side of the throat chamber 410. The air inlet chamber 300, the mixing chamber 100, the throat chamber 410 and the diffusion chamber 420 are coaxially arranged from right to left, thereby, the high-speed airflow in the air inlet chamber 300 blows the free-falling sample particles into the throat chamber 410. After the sample particles in the throat chamber 410 achieve a dispersion effect, they pass through the diffusion chamber 420 and diffuse along the inner wall of the diffusion chamber 420 according to the wall attachment principle, thereby achieving the purpose of preventing the sample particles from sticking again.
[0034] In some specific embodiments of the present invention, the throat cavity 410 is in the shape of a horizontally arranged long circular tube, and the high-speed airflow causes the sample particles to oscillate back and forth in the narrow throat cavity 410. After the sample particles fully collide with the cavity wall of the throat cavity 410, a better dispersion effect can be achieved.
[0035] In some specific embodiments of the present invention, a guiding chamber 500 is further included. The guiding chamber 500 is coaxially arranged with the feeding chamber 200. The guiding chamber 500 is located between the feeding chamber 200 and the mixing chamber 100. The feeding chamber 200 is connected with the mixing chamber 100 through the guiding chamber 500. The guiding chamber 500 is used to guide sample particles into the mixing chamber 100. Figure 2 As shown, the feed chamber 200 is in the shape of a vertically arranged circular tube, the output end of the feed chamber 200 is connected to the input end of the guide chamber 500 , and the output end of the guide chamber 500 is connected to the mixing chamber 100 to guide the sample particles falling into the feed chamber 200 into the mixing chamber 100 .
[0036] In some specific embodiments of the present invention, the air inlet chamber 300 includes: an air channel 310, which is horizontally arranged; an air nozzle 320, which is connected to the mixing chamber 100, and the air nozzle 320 and the air channel 310 are coaxially arranged and connected to each other, and the air channel 310 is located on the opposite side of the air nozzle 320 and the mixing chamber 100, and the axial cross-sectional area of the air nozzle 320 gradually decreases in the direction approaching the mixing chamber 100.
[0037] In some specific embodiments of the present invention, the mixing chamber 100 includes: an expansion chamber 110, the expansion chamber 110 is connected to the gas nozzle 320, and the axial cross-sectional area of the expansion chamber 110 gradually increases in the direction away from the gas nozzle 320; a contraction chamber 120, the contraction chamber 120 is coaxially arranged with the expansion chamber 110 and connected to each other, the contraction chamber 120 is located on the opposite side of the expansion chamber 110 and the gas nozzle 320, and the axial cross-sectional area of the contraction chamber 120 gradually decreases in the direction away from the expansion chamber 110.
[0038] like Figure 2As shown, the air inlet chamber 300 includes an air channel 310 and an air nozzle 320, and the mixing chamber 100 includes an expansion chamber 110 and a contraction chamber 120. The air channel 310, the air nozzle 320, the expansion chamber 110 and the contraction chamber 120 are coaxially arranged from right to left. It should be noted that the Venturi effect is manifested in that when the restricted flow passes through a reduced flow cross section, the flow velocity of the fluid increases, and the flow velocity is inversely proportional to the flow cross section. In layman's terms, this effect refers to the low pressure generated near the high-speed flowing fluid, thereby generating an adsorption effect. This effect can be used to make a Venturi tube. Therefore, the compressed air enters the air nozzle 320 from the air channel 310, and the cross-section of the air nozzle 320 gradually decreases, so that the flow rate of the compressed air gradually increases, and the high-speed airflow enters the contraction chamber 120 from the expansion chamber 110, and is discharged through the throat cavity 410 with a smaller cross-section. Since the cross-section of the contraction chamber 120 gradually decreases to the left, the pressure of the compressed air decreases, and the flow rate of the compressed air increases, a vacuum is generated at the input end of the expansion chamber 110, and a negative pressure area is formed above the feed chamber 200. When the freely falling sample particles fall into the negative pressure area, they are sucked into the throat cavity 410 together with the compressed air, thereby ensuring that sample particles of all particle sizes can be sucked into the Venturi chamber 400, thereby further ensuring the accuracy of the data.
[0039] Specifically, a gas port is provided between the gas channel 310 and the gas nozzle 320 , and the inner diameter of the gas port is smaller than the inner diameters of the input ends of the gas channel 310 and the gas nozzle 320 .
[0040] Specifically, the output end of the guide cavity 500 is downwardly connected to the expansion cavity 110 .
[0041] Specifically, the cross-sectional area of the output end of the gas nozzle 320 is smaller than the axial cross-sectional area of the venturi chamber 400 , that is, the inner diameter of the output end of the gas nozzle 320 is smaller than the inner diameter of the venturi chamber 400 .
[0042] In some specific embodiments of the present invention, compressed air enters the air nozzle 320 from the air channel 310, and the cross-section of the air nozzle 320 gradually decreases to the left, so that the flow rate of the compressed air gradually increases, and a vacuum is generated at the input end of the guide chamber 500, causing the surrounding air to form a negative pressure area above the funnel-shaped feeding chamber 200. The sample particles fall freely from the negative pressure area above the feeding chamber 200, pass through the guide chamber 500 and enter the expansion chamber 110, and the high-speed airflow passes through the expansion chamber 110 and enters the contraction chamber 120, and flows into the contraction chamber 120 together with the high-speed airflow. After the high-speed airflow changes diameter and speeds up in the contraction chamber 120, it oscillates back and forth in the narrow throat chamber 410. The sample particles fully collide and rub against the chamber wall to achieve a dispersion effect. When the dispersed sample particles pass through the diffusion chamber 420, they will diffuse along the inner wall of the diffusion chamber 420 according to the wall attachment principle. Therefore, negative pressure can suck all samples of all particle sizes into the laryngeal cavity 410, and the entire passage process of the sample particles is free of any structural obstruction, fundamentally eliminating the measurement interruption caused by sample particle blockage, avoiding sample particle adhesion, and improving the accuracy of the test.
[0043] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.
Claims
1. A laser particle size analyzer dry dispersion device, characterized in that: include: A mixing chamber (100); A feeding chamber (200), the feeding chamber (200) being located directly above the mixing chamber (100), the output end of the feeding chamber (200) being in communication with the mixing chamber (100), and the sample entering the mixing chamber (100) through the feeding chamber (200); An air inlet cavity (300), wherein the air inlet cavity (300) is arranged horizontally, and an output end of the air inlet cavity (300) is connected to the mixing cavity (100), and a high-speed airflow enters the mixing cavity (100) through the air inlet cavity (300); A venturi chamber (400), wherein the venturi chamber (400) is coaxially arranged with the air inlet chamber (300) in the horizontal direction, and the venturi chamber (400) comprises a throat chamber (410), wherein the input end of the throat chamber (410) is connected to the output end of the mixing chamber (100), and the throat chamber (410) is used to disperse sample particles entering from the mixing chamber (100).
2. The laser particle size analyzer dry dispersion device according to claim 1, characterized in that: The Venturi chamber (400) further comprises a diffusion chamber (420), the input end of the diffusion chamber (420) being connected to the output end of the throat chamber (410), the diffusion chamber (420) being coaxially arranged with the throat chamber (410), the diffusion chamber (420) being located on a side opposite to the throat chamber (410) and the mixing chamber (100), the axial cross-sectional area of the diffusion chamber (420) gradually increasing in a direction away from the throat chamber (410), and the diffusion chamber (420) being capable of preventing sample adhesion.
3. The laser particle size analyzer dry dispersion device according to claim 1, characterized in that: The throat cavity (410) is in the shape of a horizontally arranged long circular tube, and the high-speed airflow oscillates back and forth in the narrow throat cavity (410) so that the sample fully collides with the cavity wall of the throat cavity (410) to achieve a dispersion effect.
4. The laser particle size analyzer dry dispersion device according to claim 1, characterized in that: The invention also comprises a guide chamber (500), wherein the guide chamber (500) is coaxially arranged with the feed chamber (200), the guide chamber (500) is located between the feed chamber (200) and the mixing chamber (100), the feed chamber (200) is connected with the mixing chamber (100) through the guide chamber (500), and the guide chamber (500) is used to guide the sample into the mixing chamber (100).
5. The laser particle size analyzer dry dispersion device according to claim 4, characterized in that: The air inlet cavity (300) comprises: An air channel (310), wherein the air channel (310) is arranged horizontally; An air nozzle (320), wherein the output end of the air nozzle (320) is connected to the mixing chamber (100), the air nozzle (320) and the air channel (310) are coaxially arranged, the input end of the air nozzle (320) is connected to the output end of the air channel (310), the air channel (310) is located on the opposite side of the air nozzle (320) and the mixing chamber (100), and the axial cross-sectional area of the air nozzle (320) gradually decreases in a direction approaching the mixing chamber (100).
6. The laser particle size analyzer dry dispersion device according to claim 5, characterized in that: The mixing chamber (100) comprises: an expansion chamber (110), the expansion chamber (110) being in communication with an output end of the gas nozzle (320), the axial cross-sectional area of the expansion chamber (110) gradually increasing in a direction away from the gas nozzle (320); A contraction chamber (120), wherein the contraction chamber (120) is coaxially arranged with the expansion chamber (110), the input end of the contraction chamber (120) is connected with the output end of the expansion chamber (110), the contraction chamber (120) is located on a side opposite to the expansion chamber (110) and the gas nozzle (320), and the axial cross-sectional area of the contraction chamber (120) gradually decreases in a direction away from the expansion chamber (110).
7. The laser particle size analyzer dry dispersion device according to claim 6, characterized in that: The guide cavity (500) is in communication with the expansion cavity (110).
8. The laser particle size analyzer dry dispersion device according to claim 5, characterized in that: The cross-sectional area of the output end of the gas nozzle (320) is smaller than the axial cross-sectional area of the throat cavity (410).