Sample introduction device and laser particle size analyzer

Abstract

The utility model discloses a sampling device and a laser particle size analyzer, and relates to the technical field of particle size analysis equipment. The sample injection device comprises a sample injector and a sample pool, a first valve is arranged at a water inlet of the sample pool, the sample injector is detachably connected with the first valve, and when the first valve is opened, the sample injector is communicated with the sample pool through the first valve, so that a sample solution in the sample injector is injected into the sample pool through the first valve. The sample introduction device and the laser particle size analyzer can solve the problem that the sample introduction amount of the laser particle size analyzer in the prior art cannot meet the measurement requirement of an instrument.

Description

Technical Field

[0001] The utility model relates to the technical field of particle size analysis equipment, in particular to a sample injection device and a laser particle size analyzer. Background Art

[0002] Laser particle size analyzers use Mie light scattering theory to measure the size of spherical particles. When particles are irradiated by a laser beam, the angular distribution of scattered light is inversely proportional to the diameter of the particles. When the laser beam passes through an inhomogeneous medium, the laser beam deviates due to absorption, reflection, refraction, transmission and diffraction. By obtaining the angle and intensity signal of the light deviation, combined with the known optical parameter information of the dispersion medium and the particles, the particle size distribution characteristics of the particles can be inverted using the light scattering model. Laser particle size analyzers are widely used in geography, environment, building materials, chemical industry, pharmaceuticals and other fields. In the field of geology, laser particle size analyzers are mainly used to characterize the particle size distribution characteristics of natural sediments, such as loess sediments, lake sediments, marine sediments, sandstorms, etc. By analyzing the composition characteristics of sediment particle size and establishing a rhythmic curve of sediment particle size change, the hydrodynamic or wind dynamic conditions in the historical period of sediment formation can be obtained, thereby inferring the characteristics of environmental changes at that time. The distribution characteristics of sediment particle size have become one of the most widely used basic indicators in geological research, and laser particle size analyzer has also become an indispensable analytical instrument in geological research.

[0003] When measuring particle size distribution, the laser particle size analyzer requires that the particles are completely dispersed in the dispersant medium system. At present, the most commonly used dispersing media are water and air, which correspond to the wet and dry injection of laser particle size measurement, respectively. Due to the limitations of their own properties, geoscience samples can only be dispersed in aqueous solutions, so only wet injection is applicable. Traditional laser particle size analyzers realize the injection of different types of samples by connecting different types of injectors to the sample pool measurement unit. The commonly used external wet injector uses liquid dispersant as a carrier to transport the sample particles to be measured to the instrument sample pool unit for measurement. Most external injectors not only have a large injection volume, require a large amount of sample, but are also relatively expensive. As a result, the measurement of some precious natural sediment samples (for example, ice cores, lake boreholes, ocean boreholes, etc.) is greatly restricted, and the amount of samples available for measurement cannot meet the instrument measurement shading requirements, which seriously hinders the smooth progress of scientific research. Utility Model Content

[0004] The utility model aims to provide a sample injection device and a laser particle size analyzer, which can solve the problem that the sample injection volume of the laser particle size analyzer in the prior art cannot meet the measurement requirements of the instrument.

[0005] The embodiment of the utility model is achieved as follows:

[0006] In a first aspect of the embodiment of the utility model, a sample injection device is provided, comprising a sample injector and a sample pool, wherein a first valve is provided at a water inlet of the sample pool, the sample injector is detachably connected to the first valve, and when the first valve is opened, the sample injector is connected to the sample pool through the first valve, so that the sample solution in the sample injector is injected into the sample pool through the first valve. The sample injection device can solve the problem that the sample injection amount of the laser particle size analyzer in the prior art cannot meet the measurement requirements of the instrument.

[0007] Optionally, the injector includes a tube body, a piston head disposed in the tube body, and a push rod fixedly connected to the piston head, and the push rod is driven to drive the piston head to move relative to the tube body to suck the sample solution into the tube body or inject the sample solution in the tube body into the sample pool.

[0008] Optionally, the outer diameter of the piston head is matched with the inner diameter of the tube body.

[0009] Optionally, the tube body is made of a transparent material, and a scale is provided on the outer surface of the tube body along the pushing direction of the push rod.

[0010] Optionally, the sampling device also includes a magnetic stirrer, which includes a motor and a stirring magnet. The motor is installed at the bottom of the sample pool, the stirring magnet is arranged in the sample pool, the motor is connected to the stirring magnet, and the motor is used to drive the stirring magnet to rotate relative to the sample pool.

[0011] Optionally, the sampling device also includes a water pump, the water inlet and the water outlet of the sample pool are connected by a pipeline, the sample pool and the pipeline together form a circulation system, the water pump is arranged on the pipeline, and the water pump is used to provide power for the sample solution in the sample pool so that it circulates in the circulation system.

[0012] Optionally, the sampling device also includes a collector, and the water outlet of the sample pool is provided with a second valve. The collector is detachably connected to the second valve. When the second valve is opened, the collector is connected to the sample pool through the second valve, so that the sample solution in the sample pool is discharged into the collector through the second valve.

[0013] Optionally, when the sampling device further includes a water pump and the collector, the first valve and the second valve are both three-way valves, and the water pump is a peristaltic pump.

[0014] Optionally, observation windows are provided on two opposite sides of the sample pool, and the material of the observation windows is a transparent material.

[0015] The second aspect of the embodiment of the utility model provides a laser particle size analyzer, comprising the above-mentioned sample injection device. The sample injection device can solve the problem that the sample injection volume of the laser particle size analyzer in the prior art cannot meet the instrument measurement requirements.

[0016] The beneficial effects of the embodiments of the utility model include:

[0017] The injection device includes an injector and a sample pool. The water inlet of the sample pool is provided with a first valve. The injector is detachably connected to the first valve. When the first valve is opened, the injector is connected to the sample pool through the first valve, so that the sample solution in the injector is injected into the sample pool through the first valve. When a certain dose of sample solution needs to be obtained through the injector, the first valve can be closed first, and then the injector and the first valve can be disconnected. Thus, it can be ensured that the sample pool will not be contaminated by the outside world due to the first valve being in an open state, and a certain dose of sample solution can be obtained from the sample solution dispenser through the injector; when the sample solution in the injector needs to be injected into the sample pool for testing, the injector can be connected to the first valve first, and then the first valve can be opened. Thus, the injector can be connected to the sample pool through the first valve, so that the sample solution in the injector can be injected into the sample pool through the first valve. The sample injection device provided in the embodiment of the present application is provided with a first valve through the water inlet of the sample pool, and the sample injector is detachably connected to the first valve to cleverly integrate the sample injector and the sample pool together, effectively reducing the loss of solid sample particles caused by the external sample injection device in the prior art, overcoming the requirements of the traditional laser particle size analyzer on the amount of sample to be measured, enabling the particle size characterization analysis of trace samples to be smoothly realized, and expanding the application field of the laser particle size analyzer. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of the structure of the sample injection device provided in an embodiment of the utility model;

[0020] Figure 2 This is a schematic structural diagram of a laser particle size analyzer provided in an embodiment of the utility model.

[0021] Icons: 21-laser; 22-Fourier lens; 24-injection device; 25-array detector; 26-focal plane detector; 27-backward detector; 1-observation window; 2-sample pool; 3-stirring magnet; 4-motor; 5-collector; 6-first valve; 7-water pump; 8-second valve; 9-injector. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0025] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does 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 utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0026] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0027] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Figure 2 This is a schematic diagram of the structure of the laser particle size analyzer provided in the embodiment of the utility model. Figure 2 An embodiment of the present application provides a laser particle size analyzer, including a laser 21, a Fourier lens 22, a sample introduction device 24 and a detector, wherein the laser 21 can be a He-Ne laser, the number of the Fourier lenses 22 can be two, the two Fourier lenses 22 are arranged in sequence along the optical path direction of the laser beam emitted by the laser 21, and the detector can include a series of array detectors 25.

[0029] The working principle of the laser particle size analyzer provided in the embodiment of the present application is that a He-Ne laser emits a laser beam of a certain wavelength, which is maintained as a single parallel light beam through a Fourier lens 22. When the parallel light beam is irradiated onto the sample particles, scattering will occur. The scattered light is received by a series of array detectors 25, and its energy distribution characteristics are measured. According to the inverse proportional relationship between the angular distribution of the scattered light and the particle size, the particle size distribution characteristics of the sample particles can be obtained.

[0030] Regarding the specific selection of the detector, in addition to the above-mentioned detector can include a series of array detectors 25, those skilled in the art should be able to make reasonable selections and designs according to actual conditions, and no specific restrictions are made here. For example, Figure 2 As shown, in this embodiment, the detector may further include a focal plane detector 26 and a back detector 27 to obtain corresponding test data during the test process, thereby performing multi-directional particle size characterization of the sample particles.

[0031] Figure 1 This is a schematic diagram of the structure of the sample injection device 24 provided in the embodiment of the utility model. Figure 1 and Figure 2 The injection device 24 provided in the embodiment of the present application includes an injector 9 and a sample pool 2. The water inlet of the sample pool 2 is provided with a first valve 6. The injector 9 is detachably connected to the first valve 6. When the first valve 6 is opened, the injector 9 is connected to the sample pool 2 through the first valve 6, so that the sample solution in the injector 9 is injected into the sample pool 2 through the first valve 6.

[0032] It should be noted that if Figure 1 As shown, the sample injection device 24 includes a sample injector 9 and a sample pool 2, so as to obtain a certain dose of sample solution through the sample injector 9, and inject the sample solution in the sample pool 2 into the sample pool 2 for testing through the sample injector 9. Specifically, the sample pool 2 has a water inlet and a water outlet, and a first valve 6 is provided on the water inlet of the sample pool 2, and the sample injector 9 is detachably connected to the first valve 6. Among them, the first valve 6 is provided on the water inlet of the sample pool 2, and the first valve 6 can be directly connected to the water inlet of the sample pool 2, or the first valve 6 can be connected to the water inlet pipe connected to the water inlet of the sample pool 2.

[0033] When it is necessary to obtain a certain dose of sample solution through the injector 9, the first valve 6 can be closed first, and then the injector 9 can be disconnected from the first valve 6. In this way, it can be ensured that the sample pool 2 will not be contaminated by the outside world due to the first valve 6 being in the open state, and a certain dose of sample solution can be obtained from the sample solution dispenser through the injector 9; when it is necessary to inject the sample solution in the sample pool 2 into the sample pool 2 for testing through the injector 9, the injector 9 can be connected to the first valve 6 first, and then the first valve 6 can be opened. In this way, the injector 9 can be connected to the sample pool 2 through the first valve 6, so that the sample solution in the injector 9 can be injected into the sample pool 2 through the first valve 6.

[0034] The sample solution dispenser can be any container that can accommodate sample particles and dispersant medium, such as a beaker, a culture dish, etc. Those skilled in the art should be able to make reasonable selections and designs according to actual conditions, and no specific restrictions are made here. For example, a certain amount of dispersant medium can be added to the sample solution dispenser first, and then a trace amount of solid sample particles can be dispersed into the dispersant medium, thereby obtaining a sample solution with a trace amount of solid sample particles, so as to reduce the amount of solid sample particles used, thereby saving test costs.

[0035] The sample injection device 24 provided in the embodiment of the present application is provided with a first valve 6 through the water inlet of the sample pool 2, and the sample injector 9 is detachably connected to the first valve 6 to cleverly integrate the sample injector 9 and the sample pool 2 together, thereby effectively reducing the loss of solid sample particles by the external sample injection device in the prior art, overcoming the requirements of the traditional laser particle size analyzer on the amount of sample to be measured, and enabling the particle size characterization analysis of trace samples to be smoothly realized, thereby expanding the application field of the laser particle size analyzer.

[0036] Specifically, Figure 1As shown, in this embodiment, the injector 9 includes a tube body, a piston head arranged in the tube body, and a push rod fixedly connected to the piston head. The push rod is driven to drive the piston head to move relative to the tube body to suck the sample solution into the tube body or inject the sample solution in the tube body into the sample pool 2.

[0037] It should be noted that the tube body is designed with a large opening at one end and a small opening at the other end, so that the push rod and the piston head can extend into the tube body through the large opening. When the sample solution in the sample solution dispenser needs to be sucked into the tube body, the push rod can be pulled outward so that the push rod drives the piston head to move relative to the tube body toward the side away from the small opening, thereby sucking the sample solution into the tube body through the small opening; when the sample solution in the tube body needs to be injected into the sample pool 2, the push rod can be pushed inward so that the push rod drives the piston head to move relative to the tube body toward the side close to the small opening, thereby injecting the sample solution into the sample pool 2 through the small opening. Therefore, the injection amount of the sample solution can be controlled by adjusting the advancement distance of the push rod (or the piston head).

[0038] The outer diameter of the piston head should be matched with the inner diameter of the tube body, so that when the piston head moves relative to the tube body, a certain amount of suction force can be provided, thereby being able to suck the sample solution in the sample solution dispenser into the tube body. In addition, the piston head can be made of silicone material. When the piston head moves relative to the tube body and contacts the inner surface of the tube body, on the one hand, wear between the piston head and the tube body can be avoided, and on the other hand, the sample solution in the tube body can be fully injected into the sample pool 2 to the greatest extent, without the phenomenon of residual sample solution in the tube body causing waste.

[0039] Optionally, the material of the tube body is a transparent material, such as plastic, glass, etc., so as to facilitate observation of the dosage of the sample solution in the tube body. On this basis, a scale can also be provided on the outer surface of the tube body along the pushing direction of the push rod, so as to facilitate clear quantification of the dosage of the sample solution in the tube body through the scale, thereby improving the accuracy of human eye observation. Among them, the specific division of the scale should be reasonably selected and designed by those skilled in the art according to actual conditions, and no specific limitation is made here.

[0040] Furthermore, if Figure 1As shown, in this embodiment, the sample injection device 24 also includes a magnetic stirrer, and the magnetic stirrer includes a motor 4 and a stirring magnet 3. The motor 4 is installed at the bottom of the sample pool 2, and the stirring magnet 3 is arranged in the sample pool 2. The motor 4 is connected to the stirring magnet 3, and the motor 4 is used to drive the stirring magnet 3 to rotate relative to the sample pool 2. Therefore, by controlling the operation and speed of the motor 4, the operation and speed of the stirring magnet 3 can be controlled in real time, so that the solid sample particles in the sample pool 2 can be evenly dispersed into the dispersant medium, and then the solid sample particles can be prevented from agglomerating and precipitating in the sample pool 2, thereby avoiding the influence of the aggregation of the solid sample particles on the accuracy of the analysis and characterization results.

[0041] Furthermore, if Figure 1 As shown, in this embodiment, the sample injection device 24 also includes a water pump 7, the water inlet and the water outlet of the sample pool 2 are connected through a pipeline, the sample pool 2 and the pipeline together form a circulation system, the water pump 7 is arranged on the pipeline, and the water pump 7 is used to provide power for the sample solution in the sample pool 2 so that it circulates in the circulation system. Thus, the sample solution in the sample pool 2 can be continuously circulated in the circulation system through the water pump 7, so as to realize the real-time dynamic detection of the particle size of the solid sample particles, thereby avoiding the agglomeration and precipitation of the solid sample particles in the sample pool 2, thereby avoiding the influence of the aggregation of the solid sample particles on the accuracy of the analysis and characterization results.

[0042] It should be noted that the water inlet and water outlet of the sample pool 2 are connected by a pipeline, and the pipeline may include two sub-pipelines, so that the water inlet of the sample pool 2 and one end of the water pump 7 are connected through one sub-pipeline, and the water outlet of the sample pool 2 and the other end of the water pump 7 are connected through the other sub-pipeline, so that the sample pool 2 and the pipeline together form a circulation system, and the water pump 7 is arranged on the pipeline.

[0043] At this time, the first valve 6 can be arranged on a sub-pipeline connecting the water inlet of the sample pool 2 and one end of the water pump 7, so as to be indirectly connected to the water inlet of the sample pool 2. Preferably, the first valve 6 can be located on one side of the sub-pipeline close to the water inlet of the sample pool 2. The water pump 7 can be a peristaltic pump to accurately control the delivery volume of the water pump 7.

[0044] Furthermore, if Figure 1 As shown, in this embodiment, the sample injection device 24 further includes a collector 5, and a second valve 8 is provided at the water outlet of the sample pool 2. The collector 5 is detachably connected to the second valve 8. When the second valve 8 is opened, the collector 5 is connected to the sample pool 2 through the second valve 8, so that the sample solution in the sample pool 2 is discharged into the collector 5 through the second valve 8. Optionally, the first valve 6 is a three-way valve, so as to be connected to the water inlet of the sample pool 2, the sample injector 9 and the water pump 7 respectively.

[0045] It should be noted that if Figure 1 As shown, when the sampling device 24 also includes a collector 5, the sample solution in the sample pool 2 can be collected by the collector 5, so as to realize the recycling and reuse of the sample solution, thereby reducing the test cost. During the test phase, the second valve 8 needs to be in a closed state. After the test is completed, the second valve 8 can be in an open state, so that the collector 5 can be connected with the sample pool 2 through the second valve 8, and the sample solution in the sample pool 2 can be discharged into the collector 5 through the second valve 8.

[0046] When the sample injection device 24 also includes a water pump 7 and a collector 5, not only can the sample solution in the sample pool 2 be collected by the collector 5, but also after the sample solution is recovered, a cleaning solution (such as clean water and / or a cleaning agent) can be injected into the collector 5, and the cleaning solution is continuously circulated in the circulation system by the water pump 7 to clean the residual solid sample particles attached to the sample pool 2 and the pipeline, so as to achieve the purpose of cleaning the circulation system. After the cleaning is completed, the waste liquid in the circulation system can also be collected by the collector 5 to ensure the accuracy of the particle size characterization analysis results. For the cleaning of the sample injector 9 and the collector 5, the first valve 6 and the second valve 8 can be closed first, and then the sample injector 9 and the collector 5 can be disassembled for separate flushing.

[0047] At this time, the second valve 8 can be arranged on the sub-pipeline connecting the water outlet of the sample pool 2 and the other end of the water pump 7, so as to be indirectly connected to the water outlet of the sample pool 2. Preferably, the second valve 8 can be located on one side of the sub-pipeline close to the water outlet of the sample pool 2. Optionally, the second valve 8 is a three-way valve, so as to be connected to the water outlet of the sample pool 2, the collector 5 and the water pump 7 respectively.

[0048] Optionally, observation windows 1 are provided on two opposite sides of the sample pool 2 , and the material of the observation windows 1 is a transparent material, such as glass with high light transmittance, so as to facilitate observation of the sample solution in the sample pool 2 .

[0049] In summary, the steps of using the above-mentioned sample injection device 24 for wet testing are as follows:

[0050] S1. Connect the sample injection device 24 to the laser particle size analyzer.

[0051] S2. Draw a certain dose of sample solution through the injector 9, connect the injector 9 to the first valve 6, open the first valve 6, and slowly push the piston head through the push rod to inject the sample solution into the sample pool 2. The injection amount of the sample solution can be controlled by adjusting the pushing distance of the push rod (or the piston head).

[0052] S3, start the motor 4 and the water pump 7, and drive the stirring magnet 3 to rotate through the motor 4 to evenly disperse the sample particles in the dispersant medium. Through the conveying action of the water pump 7, the sample solution circulates at a uniform speed through the observation window 1 in the circulation system, effectively avoiding the aggregation and precipitation of the solid sample particles.

[0053] S4. Start the laser particle size analyzer and start the particle size analysis and characterization of the solid sample particles after the instrument is stable.

[0054] S5. After the measurement is completed, the second valve 8 is opened, and the sample solution is recovered into the collector 5 under the action of the water pump 7. The first valve 6 is closed, and the sample injector 9 is disassembled for manual flushing.

[0055] S6. Inject a cleaning solution into the collector 5. The cleaning solution circulates in the circulation system through the conveying action of the water pump 7, thereby cleaning the sample pool 2 and the pipeline. After the cleaning is completed, the waste liquid is discharged into the collector 5.

[0056] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

[0057] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present utility model will not further describe various possible combinations.

Claims

1. A sample injection device, characterized in that: It includes an injector and a sample pool, wherein a first valve is provided at a water inlet of the sample pool, and the injector is detachably connected to the first valve. When the first valve is opened, the injector is connected to the sample pool through the first valve, so that the sample solution in the injector is injected into the sample pool via the first valve.

2. The sample injection device according to claim 1, characterized in that: The injector includes a tube body, a piston head arranged in the tube body, and a push rod fixedly connected to the piston head. The push rod is driven to drive the piston head to move relative to the tube body to suck the sample solution into the tube body or inject the sample solution in the tube body into the sample pool.

3. The sample injection device according to claim 2, characterized in that: The outer diameter of the piston head is matched with the inner diameter of the tube body.

4. The sample injection device according to claim 2, characterized in that: The tube body is made of transparent material, and a scale is arranged on the outer surface of the tube body along the pushing direction of the push rod.

5. The sample injection device according to claim 1, characterized in that: The sample injection device also includes a magnetic stirrer, which includes a motor and a stirring magnet. The motor is installed at the bottom of the sample pool, the stirring magnet is arranged in the sample pool, the motor is connected to the stirring magnet, and the motor is used to drive the stirring magnet to rotate relative to the sample pool.

6. The sample injection device according to claim 1, characterized in that: The sample injection device also includes a water pump. The water inlet and the water outlet of the sample pool are connected through a pipeline. The sample pool and the pipeline together form a circulation system. The water pump is arranged on the pipeline. The water pump is used to provide power for the sample solution in the sample pool so that it circulates in the circulation system.

7. The sample injection device according to claim 1 or 6, characterized in that: The sampling device also includes a collector, and a second valve is provided at the water outlet of the sample pool. The collector is detachably connected to the second valve. When the second valve is opened, the collector is connected to the sample pool through the second valve, so that the sample solution in the sample pool is discharged into the collector through the second valve.

8. The sample injection device according to claim 7, characterized in that: When the sampling device further includes a water pump and the collector, the first valve and the second valve are both three-way valves, and the water pump is a peristaltic pump.

9. The sample injection device according to claim 1, characterized in that: Observation windows are arranged on opposite sides of the sample pool, and the material of the observation windows is transparent material.

10. A laser particle size analyzer, characterized in that: The invention comprises the sampling device as described in any one of claims 1 to 9.

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