A uniform sampling device and a method for calibrating the same

Abstract

The application discloses a uniform sampling device and a calibration method thereof. The sampling device comprises an outer shell body provided with a shielding cover at the top, a collecting piece arranged in the outer shell body, a sample inlet assembly comprising a sample inlet tube and a sample collection sealing piece, a drainage assembly comprising a drainage tube, a flow limiting assembly comprising a flow limiting tube, and an opening arranged on the collecting piece and connected with the sample collection sealing piece. The sample inlet tube comprises a sample inlet end located outside the outer shell body and a sample outlet end located inside the collecting piece and penetrating through the sample collection sealing piece. The drainage tube comprises an inlet end arranged in the collecting piece and a drainage end. The flow limiting tube comprises a fixed end connected with the drainage end and a free end in communication with the atmosphere. The application sets the inverted collecting piece in the outer shell body, collects the sample fluid by using the hydraulic pressure difference, does not need to be connected with an external pump, and can replace the collecting bottle for use, so that the sampling cost is low, the manual intervention is less, the flow limiting assembly is arranged and calibrated, the precise control of the discharged fluid is realized, the sampling time is accurately controlled, and the sampling device can uniformly sample.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fluid sampling, and particularly relates to a uniform sampling device and a calibration method thereof. BACKGROUND

[0002] Sampling refers to the process of taking individuals or samples from a population, and in scientific experiments, the analysis of part of the sample can obtain relevant data of the population. Different sampling methods are used according to different needs. In fluid sampling, disposable sampling and external pump sampling are commonly used. Disposable sampling directly collects fluid through a container, and although it is time-saving, it cannot reflect the relationship between the sample and time. For example, if the content of a certain component in flowing water needs to be measured, disposable sampling can only measure the content of water at a certain time, and even if multiple repeated sampling is performed, there will still be errors. Although external pump sampling can reduce the error, the external pump needs to consume additional energy, and is inconvenient to operate, especially for long-time fluid sampling. The sampling cost is high, and manual intervention is required. SUMMARY

[0003] Other features and advantages of the present application will be set forth in the following specification, and in part will become apparent to those skilled in the art upon exercise of the disclosure herein, or by practice of the application. The objectives and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims hereof.

[0004] The present application aims to overcome the above-mentioned deficiencies, and provides a uniform sampling device and a calibration method thereof, which has the advantages of uniform sampling, reusability, less manual intervention, and low sampling cost. The sampling time can be accurately controlled, the sample has a high correlation with time, and is closer to the population.

[0005] In a first aspect, the present application provides a uniform sampling device, which comprises an outer shell body provided with a shielding cover, a collection member arranged in the outer shell body, a sampling assembly comprising a sampling sealing member and a sampling pipe, a drainage assembly comprising a drainage pipe, and a flow blocking assembly comprising a flow limiting pipe. The collection member is provided with an opening connected with the sampling sealing member. The sampling pipe comprises a sampling end located outside the outer shell body and a sampling outlet end located inside the collection member and passing through the sampling sealing member. The drainage pipe comprises a flow inlet end arranged in the collection member and a drainage end. The flow limiting pipe comprises a fixed end connected with the drainage end and a free end. The flow limiting pipe is in communication with the atmosphere through the free end.

[0006] The collecting device is used for collecting fluid sample, and can be separated from the collecting seal vertically when the collecting device is full, so as to replace the collecting device and reduce the use cost. When the fluid sample is taken, the whole outer shell is placed in the fluid, and since the sample inlet pipe and the discharge pipe are extended from the collecting bottle and connected with the fluid to be sampled and the atmosphere respectively, when the outer shell sinks into the fluid, the collecting bottle and the fluid outside the outer shell form a pressure difference, so that the fluid is actively taken into the collecting device from the sample inlet assembly, and at this time, the flow control assembly controls the discharge speed of the original fluid in the collecting device, so as to indirectly control the sampling speed of the collecting device, so that the sampling device can sample in the target time, realizes uniform sampling, and can realize automatic sampling without external pressure pump, reduces manual intervention, increases the correlation between the sample and the time, and reduces the sample data error interference.

[0007] In some embodiments, the flow control assembly further comprises a main core pipe, and the flow limiting pipe is spirally wound on the outer wall of the main core pipe. The flow control assembly winds the flow limiting pipe on the main core pipe, constantly changes the movement direction of the discharged fluid, prolongs the movement path, and further changes the speed of the discharged fluid, so as to control the sampling speed.

[0008] In some embodiments, the cross-sectional area of the free end is smaller than the cross-sectional area of the fixed end. The flow control assembly can also control the speed of the discharged fluid by reducing the cross-sectional area of the free end which communicates with the atmosphere.

[0009] In some embodiments, the discharge assembly further comprises a liquid storage cavity which is arranged below the discharge pipe and communicates with the discharge pipe, and a valve is arranged on the liquid storage cavity. The liquid storage cavity is used for collecting the sample fluid which enters the discharge pipe by mistake, and is arranged below the discharge pipe. Since the density of the sample fluid is greater than the density of the discharged fluid, the sample fluid which enters the discharge pipe will be retained in the liquid storage cavity, so as to avoid blocking the flow path of the discharged fluid, and the valve is arranged to discharge the sample fluid in the liquid storage cavity.

[0010] In some embodiments, the height of the sample inlet end from the opening is greater than the height of the sample outlet end from the opening. By using the characteristics that two fluids are not mutually soluble or slightly soluble, when the density of the discharged fluid is less than the density of the sample fluid, the sample inlet end is higher than the sample outlet end, so as to prevent the collected sample from flowing out of the sample inlet end.

[0011] In some embodiments, the sample inlet assembly comprises a filter which is connected with the sample inlet end. The filter is arranged at the inlet of the sample inlet end, so as to preliminarily screen the fluid sample and prevent large-volume blocks from entering the pipeline.

[0012] In some embodiments, at least one counterweight is symmetrically arranged in the outer shell. When the buoyancy of the fluid to be measured is too large, the counterweight can be selected to increase the gravity of the sampling device, so that the sampling device can float on the fluid at a target water level.

[0013] In some embodiments, the outer shell surface is provided with a buoyancy member. When the buoyancy of the fluid to be measured is too small, the buoyancy member can be selected to increase the buoyancy of the sampling device to maintain the liquid level stable.

[0014] In some embodiments, the bottom of the outer shell is provided with at least two flow blocking members arranged around the sampling end. The flow blocking members are arranged around the sampling end to avoid the direct impact of water flow on the filter, thereby affecting the full liquid level of the collection member and the stability of the sampling.

[0015] In some embodiments, the top side of the outer shell is provided with a handle, and the handle is provided with two fixing rings. The handle facilitates the carrying and use of the sampling device, and the fixing rings are used for marking or fixing the sampling device.

[0016] In a second aspect, the present application provides a calibration method for calibrating any one of the uniform sampling devices described above, comprising the steps of:

[0017] Gas tank constant pressure: filling gas in the gas tank and maintaining a fixed gas pressure;

[0018] Device connection: connecting the fixed end of the flow limiting pipe in the flow blocking assembly to the gas tank, and connecting the free end into the graduated cylinder inverted in water;

[0019] Drainage timing: opening the gas tank, observing the change of the liquid level in the graduated cylinder, starting timing when the liquid level reaches the target initial water level, stopping timing when the water level drops to the target end water level, finally closing the gas tank, recording the water level drop time and water level change, and obtaining the exhaust speed;

[0020] Adjustment and calibration: comparing the exhaust speed with the target exhaust speed, selecting any one of the diameter, material, number of rotation winding, rotation track diameter and free end area of the flow limiting pipe to adjust, and repeating the drainage timing to obtain the target exhaust speed.

[0021] By calibrating the flow limiting pipe in the flow blocking assembly, the exhaust speed of the exhaust fluid can be tested, different flow limiting pipes can be selected according to different sampling requirements, the flow of the exhaust fluid can be adjusted to a trace amount, the precise control of the sampling time can be realized, and the manual intervention can be reduced.

[0022] By adopting the technical solutions described above, the present application has the following beneficial effects:

[0023] 1. By arranging the inverted collection bottle in the outer shell, the sample fluid is collected by using the hydraulic difference, without the need for external pump, and the collection bottle can be replaced for use, so that the sampling cost is low and the manual intervention is less.

[0024] 2. By setting the flow limiting component and calibrating the flow limiting component, precise control of the exhaust fluid is achieved, thereby precisely controlling the sampling time, enabling the sampling device to sample uniformly and obtain a more representative sample.

[0025] It should be understood that the general description above and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure.

[0026] It is obvious that such purposes of the present application and other purposes will become more apparent after the following description of the preferred embodiments with various drawings and drawings.

[0027] In order to make the above and other purposes, features and advantages of the present application more apparent, one or more preferred embodiments are described in detail below, and the drawings are shown, and are described in detail as follows. BRIEF DESCRIPTION OF DRAWINGS

[0028] The drawings are used to provide a further understanding of the present application, and constitute a part of the specification, which is used together with the embodiments of the present application to explain the present application, and does not constitute a limitation on the present application.

[0029] In the drawings, the same parts are marked with the same reference numerals, and the drawings are schematic and not necessarily drawn according to the actual proportions.

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description can only be one or more embodiments of the present application, and those skilled in the art can obtain other drawings according to such drawings without creative labor.

[0031] Figure 1 The overall structure of the uniform sampling device of the present application is shown in the drawing;

[0032] Figure 2 The internal structure of the flow blocking component of the overall structure of the uniform sampling device of the present application is shown in the drawing Figure 1 ;

[0033] Figure 3 The internal structure of the flow blocking component of the overall structure of the uniform sampling device of the present application is shown in the drawing Figure 2 ;

[0034] Figure 4 The internal structure of the flow blocking component of the overall structure of the uniform sampling device of the present application is shown in the drawing Figure 3 ;

[0035] Figure 5 The bottom view of the uniform sampling device of the present application is shown in the drawing;

[0036] Figure 6 This is a diagram showing the instrument connection for a calibration method of a uniform sampling device according to this application.

[0037] Explanation of key figure labels:

[0038] 1. Outer shell;

[0039] 11. Cover;

[0040] 2. Collection items;

[0041] 3. Sample introduction assembly;

[0042] 31. Collect the seals;

[0043] 32. Sample inlet tube;

[0044] 321. Inlet end; 322. Outlet end;

[0045] 33. Filter element;

[0046] 4. Drainage components;

[0047] 41. Drain pipe;

[0048] 411. Inlet end; 412. Outlet end;

[0049] 42. Liquid storage chamber;

[0050] 43. Valves;

[0051] 5. Flow choke components;

[0052] 51. Flow restrictor;

[0053] 511. Fixed end; 512. Free end;

[0054] 52. Main core tube;

[0055] 6. Counterweights;

[0056] 7. Buoyancy components;

[0057] 8. Flow deflector;

[0058] 9. Gas storage tank;

[0059] 10. Graduated cylinder;

[0060] 11. Exhaust valve

[0061] 12. Handle

[0062] 121. Fixing ring. Detailed Implementation

[0063] In order to make the purposes, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the specific embodiments. It should be understood that the specific embodiments described herein are merely intended to explain the present application, but not to limit the present application.

[0064] In addition, in the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are merely for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0065] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or can be integrated; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. However, it is noted that direct connection means that the connection between the two main bodies does not form a connection relationship through a transition structure, but is connected only through a connection structure to form a whole. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0066] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0067] Reference Figure 1 , Figure 1 The present application is a schematic diagram of the overall structure of a uniform sampling device.

[0068] The present application provides a uniform sampling device, which comprises an outer shell 1, a collection member 2, a sample inlet assembly 3, a flow discharge assembly 4 and a flow blocking assembly 5.

[0069] The top of the outer shell 1 is provided with a cover 11, and the connection mode of the cover 11 and the outer shell 1 includes but is not limited to any one of threaded connection, clamping, hinge connection and the like. The cover 11 is used for rain and dust prevention. The top side of the outer shell 1 is provided with a handle 12, and the handle 12 is provided with two fixing rings 121. The collecting piece 2 arranged in the outer shell 1 is provided with an opening. The collecting piece 2 is a columnar body with a certain hardness, and the material thereof includes but is not limited to any one of plastic, glass, stainless steel and the like. The sample inlet assembly 3 includes a collecting sealing piece 31 connected with the opening and a sample inlet pipe 32. The connection mode between the opening and the collecting sealing piece 31 includes but is not limited to any one of threaded connection and nested connection. The sample inlet pipe 32 includes a sample inlet end 321 located outside the outer shell 1 and a sample outlet end 322 located inside the collecting piece 2. The sample outlet end 322 is fixedly connected with the collecting sealing piece 31. The sample inlet pipe 32 is used for the circulation of the sample fluid. The fluid discharge assembly 4 includes a fluid discharge pipe 41. The fluid discharge pipe 41 includes a fluid inlet end 411 arranged in the collecting piece 2 and a fluid discharge end 412. The fluid discharge pipe 41 serves as a channel for the original fluid in the collecting piece 2 to flow under the extrusion of the sample fluid. The flow resistance assembly 5 includes a flow resistance pipe 51. The flow resistance pipe 51 includes a fixed end 511 connected with the fluid discharge end and a free end 512 communicated with the atmosphere.

[0070] Referring to Figure 2 , Figure 2 The flow resistance assembly 5 of the overall structure of the uniform sampling device Figure 1 .

[0071] According to some embodiments of the present application, the flow resistance assembly 5 further includes a main core pipe 52. The main core pipe 52 is a pipe with a diameter of 3-5 mm. The flow resistance pipe 51 is spirally wound on the outer wall of the main core pipe 52. At this time, the flow resistance pipe 51 is preferably a Teflon pipe with a diameter of 0.1 mm. The inner wall of the pipe has a certain roughness.

[0072] Referring to Figures 3-4 , Figure 3 The flow resistance assembly 5 of the overall structure of the uniform sampling device Figure 2 ; Figure 4 The flow resistance assembly 5 of the overall structure of the uniform sampling device Figure 3 .

[0073] According to some embodiments of the present application, optionally, the cross-sectional area of the free end 512 is smaller than that of the fixed end 511, so that the flow-restricting tube 51 has a continuous or discontinuous decrease in diameter from the fixed end 511 to the free end 512. The diameter of the flow-restricting tube 51 is 1 mm. The material of the flow-restricting tube 51 includes, but is not limited to, one or a combination of stainless steel tube and synthetic ruby. The manner of decreasing the diameter includes, but is not limited to, flattening the tube near the free end 512, or narrowing the free end 512 in a V shape.

[0074] According to some embodiments of the present application, optionally, the drainage assembly 4 further comprises a liquid storage cavity 42 provided with a valve 43 and arranged below and in communication with the drainage tube 41. The liquid storage cavity 42 can be integrally formed with the drainage tube 41 or connected by a pipe. The valve 43 can be connected to the side wall of the outer housing 1 to drain water.

[0075] According to some embodiments of the present application, optionally, the height of the inflow end 411 from the opening is greater than that of the sample outlet end 322 from the opening. Since the sample fluid and the drainage fluid are complementary or slightly soluble, and the density of the drainage fluid is less than that of the sample fluid, when the sample fluid enters the collection bottle through the pressure difference, the drainage fluid is extruded from the inflow end 411. Therefore, the height of the inflow end 411 is higher than that of the sample outlet end 322, which facilitates the drainage of the original fluid in the collection assembly 2. The target sampling water level should be slightly lower than the height of the inflow end 411.

[0076] According to some embodiments of the present application, optionally, the sample inlet assembly 3 comprises a filter 33 which can be installed on the sample inlet tube 32 according to the type, and is preferably connected to the sample inlet end 321 of the sample inlet tube 32. The filter 33 can be a filter box composed of a filter screen with small mesh, or a transition device containing chemicals capable of filtering non-target samples.

[0077] According to some embodiments of the present application, optionally, at least one counterweight 6 is arranged in the outer housing 1. The counterweight 6 has a certain weight. Since there is enough space in the outer housing 1, the number of counterweights can be adjusted according to the requirements. The counterweights are symmetrically placed to keep the sampling device in a horizontal state. The liquid level height of the sampling device in the fluid to be sampled is adjusted by adjusting the counterweight 6. The liquid level height is lower than the position of the drainage end 412. As the volume of the collection assembly 2 increases, the vertical distance between the liquid level height and the drainage end 412 increases.

[0078] According to some embodiments of the present application, optionally, the outer housing 1 is provided with a buoyancy member 7 around the surface. The buoyancy member 7 is made of a material with large buoyancy and is arranged at the target initial water level. The buoyancy member 7 cooperates with the counterweight 6 to determine the water level of the sampling device in the fluid to be measured.

[0079] Referring to Figure 5 , Figure 5 is a bottom view of a uniform sampling device of the present application.

[0080] According to some embodiments of the present application, the bottom of the outer shell 1 is provided with at least one flow blocking piece 8, which is arranged around the sampling end 321. The flow blocking piece 8 is preferably a rectangular plate with a curvature.

[0081] Referring to Figure 6 , Figure 6 is a connection diagram of a calibration method instrument of a uniform sampling device of the present application.

[0082] The present application provides a calibration method for calibrating the uniform sampling device described above, which comprises the following steps:

[0083] The gas tank 9 is set to a constant pressure: a gas is filled in the gas tank 9 and a fixed gas pressure is maintained. The gas is preferably nitrogen;

[0084] Device connection: the fixed end 511 of the flow limiting pipe 51 in the flow blocking assembly 5 is connected with the constant pressure gas tank 9, and the gas is preferably nitrogen. The free end 512 is connected into the graduated cylinder 10 inverted in water. The end of the graduated cylinder 10 away from the free end 512 is provided with an exhaust valve 11;

[0085] Drainage timing: the gas tank 9 is opened, the change of the liquid level in the graduated cylinder 10 is observed, the timing is started when the liquid level reaches the target initial water level, the timing is stopped when the water level drops to the target end water level, and finally the gas tank 9 is closed. The water level drop time and the water level change are recorded, the exhaust speed is obtained, and the experiment is completed by emptying the gas in the graduated cylinder 10 through the exhaust valve 11;

[0086] Adjustment and calibration: the exhaust speed is compared with the target exhaust speed, and any one of the diameter, material, number of rotation winding turns, rotation track diameter and free end area of the flow limiting pipe 51 is selected for adjustment. The target exhaust speed is obtained by repeating the drainage timing.

[0087] Example 1

[0088] Referring to Figure 1 , Figure 1 is a schematic diagram of the overall structure of a uniform sampling device of the present application.

[0089] The present embodiment 1 provides a uniform sampling device, which comprises an outer shell 1, a collection piece 2, a sampling assembly 3, a flow discharge assembly 4, a flow blocking assembly 5, a counterweight 6, a buoyancy piece 7 and a flow blocking piece 8.

[0090] The top of the outer shell 1 is provided with a shielding cover 11, which is connected with the outer shell 1 through threads. The top side of the outer shell 1 is provided with a handle 12, and two fixing rings 121 are arranged in the handle 12.

[0091] The collecting piece 2 provided in the outer shell 1 is provided with an opening, and the collecting piece 2 is a columnar body made of plastic material with certain hardness.

[0092] The sampling assembly 3 includes a collecting sealing piece 31 connected with the opening, a sampling pipe 32, and a filtering piece 33. The opening is threadedly and sealingly connected with the collecting sealing piece 31, and a gasket is arranged between the opening and the collecting sealing piece 31. The sampling pipe 32 includes a sampling end 321 located outside the outer shell 1 and a sampling-out end 322 located inside the collecting piece 2, and the sampling-out end 322 is fixedly connected with the collecting sealing piece 31. The filtering piece 33 is a filtering box composed of a filtering mesh with relatively small mesh size.

[0093] The flow discharging assembly 4 includes a flow discharging pipe 41 and a liquid storage cavity 42. The flow discharging pipe 41 includes an inflow end 411 provided in the collecting piece 2 and a flow discharging end 412, and the height of the inflow end 411 from the opening is greater than the height of the sampling-out end 322 from the opening. The liquid storage cavity 42 is provided with a valve 43 and is arranged below the flow discharging pipe 41 and communicates with the flow discharging pipe 41.

[0094] Referring to Figure 2 , Figure 2 Fig. 5 is a schematic structural view of the flow resistance assembly of the overall structure of the uniform sampling device of the present application Figure 1 .

[0095] The flow resistance assembly 5 includes a flow limiting pipe 51 and a main core pipe 52. The flow limiting pipe 51 includes a fixed end 511 connected with the flow discharging end and a free end 512 communicating with the atmosphere. The main core pipe 52 is a pipe with a diameter of 4 mm. The flow limiting pipe 51 is spirally wound on the outer wall of the main core pipe 52. At this time, the flow limiting pipe 51 is preferably a Teflon pipe with a diameter of 0.1 mm, and the inner wall of the pipe has certain roughness.

[0096] Referring to Figure 5 , Figure 5 Fig. 6 is a bottom view of the uniform sampling device of the present application.

[0097] The counterweight 6 is two and is symmetrically arranged in the outer shell 1. The buoyancy piece 7 is annularly arranged on the surface of the outer shell 1. The flow blocking piece 8 is an arcuate rectangular plate arranged around the sampling end 321 and the filtering piece 33.

[0098] Referring to Figure 6 , Figure 6 Fig. 7 is a connection diagram of the calibration method and the instrument of the uniform sampling device of the present application.

[0099] The embodiment 1 provides a calibration method for calibrating the uniform sampling device described above, and the steps include:

[0100] The gas tank 9 is provided with a fixed pressure. Nitrogen is filled in the gas tank 9 to maintain a fixed gas pressure.

[0101] Device connection: connect the fixed end 511 of the flow restriction tube 51 in the flow blocking assembly 5 with the constant pressure gas tank 9, and the free end 512 is connected into the graduated cylinder 10 which is inverted in water, and the end of the graduated cylinder 10 away from the free end 512 is provided with an exhaust valve 11;

[0102] Drainage timing: open the gas tank 9, and observe the change of the liquid level in the graduated cylinder 10, when the liquid level reaches the target initial water level, start timing, when the water level drops to the target end water level, stop timing, finally close the gas tank 9, record the water level drop time and the water level change, and obtain the exhaust speed, and the gas in the graduated cylinder 10 is emptied through the exhaust valve 11 after the experiment is completed;

[0103] Adjustment and calibration: compare the exhaust speed with the target exhaust speed, and select the number of rotation winding turns of the flow restriction tube 51 or the diameter of the rotation track, i.e. the diameter of the main core, to adjust, and repeat the drainage timing to obtain the target exhaust speed.

[0104] Example 2

[0105] The difference between this example 2 and example 1 is that this example does not have the buoyant member 7, and the flow blocking assembly 5 is different.

[0106] This example 2 provides a uniform sampling device, which includes an outer shell 1, a collection member 2, a sample inlet assembly 3, a flow discharge assembly 4, a flow blocking assembly 5, a counterweight member 6 and a flow blocking member 8.

[0107] The top of the outer shell 1 is provided with a shielding cover 11, and the shielding cover 11 is connected with the outer shell 1 through threads. The top side of the outer shell 1 is provided with a handle 12, and the handle 12 is provided with two fixing rings 121.

[0108] The collection member 2 provided in the outer shell 1 is provided with an opening, and the collection member 2 is a columnar body made of plastic material with certain hardness.

[0109] The sample inlet assembly 3 includes a collection sealing member 31 connected with the opening, a sample inlet tube 32 and a filter member 33. The opening and the collection sealing member 31 are connected through thread sealing, and a gasket is arranged between the opening and the collection sealing member 31. The sample inlet tube 32 includes a sample inlet end 321 located outside the outer shell 1 and a sample outlet end 322 located inside the collection member 2, and the sample outlet end 322 is fixedly connected with the collection sealing member 31. The filter member 33 is a filter box composed of filter screens with relatively small mesh.

[0110] The flow discharge assembly 4 includes a flow discharge tube 41 and a liquid storage cavity 42. The flow discharge tube 41 includes a flow inlet end 411 and a flow discharge end 412 arranged in the collection member 2, and the height of the flow inlet end 411 from the opening is greater than the height of the sample outlet end 322 from the opening. The liquid storage cavity 42 is provided with a valve 43 and arranged below the flow discharge tube 41 and communicated with the flow discharge tube 41.

[0111] ReferenceFigure 3 , Figure 3 The internal structure of the flow resistance component 5 of the overall structure of the uniform sampling device of the present application is shown in the figure Figure 2 ;

[0112] The flow resistance component 5 includes a flow limiting pipe 51, which includes a fixed end 511 connected to the drainage end and a free end 512 in communication with the atmosphere. The flow limiting pipe 51 is a stainless steel pipe with a diameter of 1 mm. The pipe near the free end 512 is flattened, so that the cross-sectional area of the free end 512 is smaller than that of the fixed end 511.

[0113] Referring to Figure 5 , Figure 5 The bottom view of the uniform sampling device of the present application is shown in the figure.

[0114] The counterweight 6 is symmetrical and arranged in the outer shell 1. The flow blocking member 8 is an arc-shaped rectangular plate arranged around the sampling end 321.

[0115] Referring to Figure 6 , Figure 6 The instrument connection diagram of the calibration method of the uniform sampling device of the present application is shown in the figure.

[0116] The embodiment 2 provides a calibration method for calibrating the uniform sampling device described above, and the steps include:

[0117] The gas tank 9 is set to a fixed pressure: nitrogen gas is filled into the gas tank 9 and a fixed gas pressure is maintained;

[0118] Device connection: the fixed end 511 of the flow limiting pipe 51 in the flow resistance component 5 is connected to the constant pressure gas tank 9, and the gas is preferably nitrogen. The free end 512 is connected to the graduated cylinder 10 inverted in water. The end of the graduated cylinder 10 away from the free end 512 is provided with an exhaust valve 11;

[0119] Drainage timing: open the gas tank 9 and observe the change of the liquid level in the graduated cylinder 10. When the liquid level reaches the target initial water level, start timing. When the water level drops to the target end water level, stop timing. Finally, close the gas tank 9, record the water level drop time and water level change, and obtain the exhaust speed. After the experiment, the gas in the graduated cylinder 10 is emptied through the exhaust valve 11;

[0120] Adjustment and calibration: compare the exhaust speed with the target exhaust speed, select the free end area of the flow limiting pipe 51 for adjustment, and repeat the drainage timing to obtain the target exhaust speed.

[0121] Embodiment 3

[0122] The difference between the embodiment 3 and the embodiment 1 is that the embodiment 3 does not have the counterweight 6 and the flow resistance component 5.

[0123] The embodiment 3 provides a uniform sampling device, which comprises an outer shell 1, a collecting part 2, a sample inlet assembly 3, a flow discharge assembly 4, a flow resistance assembly 5, a buoyant part 7 and a flow blocking part 8.

[0124] The top of the outer shell 1 is provided with a shielding cover 11 which is threadedly connected with the outer shell 1. The top side of the outer shell 1 is provided with a handle 12 which is internally provided with two fixing rings 121.

[0125] The collecting part 2 arranged in the outer shell 1 is provided with an opening, and the collecting part 2 is a columnar body made of plastic material with certain hardness.

[0126] The sample inlet assembly 3 comprises a collecting sealing part 31 connected with the opening, a sample inlet pipe 32 and a filter part 33. The opening and the collecting sealing part 31 are threadedly and sealingly connected, and a gasket is arranged between the opening and the collecting sealing part 31. The sample inlet pipe 32 comprises a sample inlet end 321 located outside the outer shell 1 and a sample outlet end 322 located inside the collecting part 2, and the sample outlet end 322 is fixedly connected with the collecting sealing part 31. The filter part 33 is a filter box composed of a filter screen with small mesh.

[0127] The flow discharge assembly 4 comprises a flow discharge pipe 41 and a liquid storage cavity 42. The flow discharge pipe 41 comprises a flow inlet end 411 arranged in the collecting part 2 and a flow discharge end 412, and the height of the flow inlet end 411 from the opening is greater than the height of the sample outlet end 322 from the opening. The liquid storage cavity 42 is provided with a valve 43 and is arranged below the flow discharge pipe 41 and communicates with the flow discharge pipe 41.

[0128] Referring to Figure 4 , Figure 4 The internal structure of the flow resistance assembly 5 of the overall structure of the uniform sampling device Figure 3 .

[0129] The flow resistance assembly 5 comprises a flow limiting pipe 51 which comprises a fixed end 511 connected with the flow discharge end and a free end 512 communicating with the atmosphere. The flow limiting pipe 51 continuously decreases in diameter area from the fixed end 511 to the free end 512 in the form of a "V" shape, so that the cross-sectional area of the free end 512 is smaller than that of the fixed end 511. At this time, the "V" shaped end of the flow limiting pipe 51 is made of artificial synthetic ruby, the cross-sectional area of the free end 512 is 0.025 mm, and the cross-sectional area of the fixed end 511 is 1 mm.

[0130] Referring to Figure 5 , Figure 5 The bottom view of the uniform sampling device

[0131] The buoyant part 7 is annularly arranged on the surface of the outer shell 1, and the flow blocking part 8 is an arc-shaped rectangular plate arranged around the sample inlet end 321.

[0132] Referring to Figure 6 ,Figure 6 Figure 1 is a schematic diagram of an apparatus for calibrating a uniform sampling device according to an embodiment of the present application.

[0133] Embodiment 3 provides a calibration method for calibrating the uniform sampling device described above, the steps of which include:

[0134] Gas tank 9 pressure setting: fill nitrogen gas into the gas tank 9 and maintain a fixed gas pressure;

[0135] Apparatus connection: connect the fixed end 511 of the flow restriction tube 51 in the flow restriction assembly 5 with the constant pressure gas tank 9, the gas is preferably nitrogen, and connect the free end 512 into the graduated cylinder 10 inverted in water, the end of the graduated cylinder 10 away from the free end 512 is provided with an exhaust valve 11;

[0136] Drainage timing: open the gas tank 9, observe the change of the liquid level in the graduated cylinder 10, start timing when the liquid level reaches the target initial water level, stop timing when the water level drops to the target end water level, finally close the gas tank 9, record the water level drop time and water level change, obtain the exhaust speed, and empty the gas in the graduated cylinder 10 through the exhaust valve 11 after the experiment is completed;

[0137] Adjustment and calibration: compare the exhaust speed with the target exhaust speed, select the free end area of the flow restriction tube for adjustment, and repeat the drainage timing to obtain the target exhaust speed.

[0138] It should be understood that the embodiments disclosed herein are not limited to the specific processing steps or materials disclosed herein, but extend to equivalent alternatives of such features as understood by those skilled in the relevant art. It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.

[0139] Reference in the specification to "an embodiment" or "the embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase "in one embodiment" or "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment.

[0140] Furthermore, the described features or characteristics can be combined in any other suitable manner in one or more embodiments. In the above description, specific details of particular embodiments are provided for the purpose of providing a thorough understanding of the embodiments of the application. However, it will be apparent to one skilled in the relevant art that the application can be practiced without one or more of the specific details, or with other methods, components, materials, etc.

Claims

1. An apparatus for uniform sampling, comprising: The utility model relates to a uniform sampling device, comprising: an outer shell with a cover on the top; a collection piece invertedly arranged in the outer shell, the collection piece being provided with an opening; a sample inlet assembly including a collection sealing piece connected with the opening and a sample inlet tube including a sample inlet end outside the outer shell and a sample outlet end inside the collection piece through the collection sealing piece; a drainage assembly including a drainage tube including an inlet end in the collection piece and a drainage end, and a flow resistance assembly including a flow resistance tube including a fixed end connected with the drainage end and a free end in communication with the atmosphere, the flow resistance tube being spirally wound on the outer wall of a main core tube, the flow resistance assembly controlling the drainage speed of the original fluid in the collection piece and indirectly controlling the sample inlet speed of the collection piece, so that the sampling device can sample at a target time and realize uniform sampling without an external pressure pump.

2. The uniform sampling device of claim 1, wherein, The cross-sectional area of the free end is smaller than that of the fixed end.

3. The uniform sampling device of claim 1, wherein, The drainage assembly further includes a liquid storage cavity below the drainage tube and in communication with the drainage tube, the liquid storage cavity being provided with a valve.

4. The uniform sampling device of claim 1, wherein, The height of the inlet end from the opening is greater than that of the sample outlet end from the opening.

5. The uniform sampling device of claim 1, wherein, The sample inlet assembly includes a filter connected with the sample inlet end.

6. The uniform sampling device of claim 1, wherein, The outer shell is further provided with at least two counterweights symmetrically arranged in the outer shell.

7. The uniform sampling device of claim 1, wherein, The outer shell is further provided with a buoyant member around the surface.

8. The uniform sampling device of claim 1, wherein, The bottom of the outer shell is provided with at least two flow barriers around the sample inlet end.

9. The uniform sampling device of claim 1, wherein, The top side of the outer shell is provided with a handle, and the handle is provided with two fixing rings.

10. A calibration method characterized by, The uniform sampling device according to any one of claims 1-9 is calibrated, and the calibration steps include: gas tank pressure setting: filling gas into the gas tank and maintaining a fixed gas pressure; device connection: connecting the fixed end of the flow resistance tube in the flow resistance assembly with the gas tank and connecting the free end with a graduated cylinder inverted in water; drainage timing: opening the gas tank, observing the change of the liquid level in the graduated cylinder, starting timing when the liquid level reaches the target initial water level, stopping timing when the water level drops to the target end water level, finally closing the gas tank, recording the water level drop time and water level change, and obtaining the drainage speed; adjustment and calibration: comparing the drainage speed with the target drainage speed, adjusting any one of the diameter, material, number of spiral winding turns, diameter of spiral track, and area of the free end of the flow resistance tube, and repeating the drainage timing to obtain the target drainage speed.

Images