CN219736892U

CN219736892U - Uniform sampling device

Info

Publication number: CN219736892U
Application number: CN202320241147.4U
Authority: CN
Inventors: 林哲凯; 池瑞桢; 吴晓烽; 苏财源; 朱孔涛; 曾志胤; 曾建晟; 卢建斌; 宋禹廷
Original assignee: Xiamen Kunming Biotechnology Co ltd
Current assignee: Xiamen Kunming Biotechnology Co ltd
Priority date: 2023-02-16
Filing date: 2023-02-16
Publication date: 2023-09-22
Anticipated expiration: 2033-02-16

Abstract

The utility model discloses a uniform sampling device. The sampling device comprises an outer shell, a collecting piece, a flow-limiting assembly and a flow-limiting pipe, wherein the top of the outer shell is provided with a shielding cover, the collecting piece is arranged in the outer shell, the flow-limiting assembly comprises a collecting sealing piece and a sample-feeding assembly, the sample-feeding assembly comprises a flow-limiting pipe and a flow-blocking assembly, the collecting piece is provided with an opening connected with the collecting sealing piece, the sample-feeding pipe comprises a sample-feeding end positioned outside the outer shell and a sample-discharging end positioned inside the collecting piece and penetrating through the sealing piece, the flow-feeding end and the flow-discharging end are arranged in the collecting piece, the flow-limiting pipe comprises a fixed end and a free end, the fixed end and the free end are connected with the flow-limiting pipe, and the flow-limiting pipe is communicated with the atmosphere through the free end. According to the utility model, the inverted collecting piece is arranged in the outer shell, the collection of the sample fluid is realized by utilizing the hydraulic pressure difference, an external pump is not needed, the collecting bottle can be replaced, the sampling cost is low, the manual intervention is less, the flow limiting assembly is arranged for calibration, the accurate control of the discharged fluid is realized, the sampling time is further accurately controlled, and the sampling device can uniformly sample.

Description

Uniform sampling device

Technical Field

The utility model relates to the technical field of fluid sampling, in particular to a uniform sampling device.

Background

Sampling refers to the process of taking an individual or sample from a population, and analysis of a portion of the sample is common in scientific experiments to obtain overall correlation data. According to different requirements, there are different sampling methods, in fluid sampling, disposable sampling and external pump sampling are often adopted, the disposable sampling directly collects fluid through a container, although the time consumption is short, the sample cannot reflect the relation between the whole body and the time, for example, the content of a certain component in flowing water flow needs to be measured, the disposable sampling can only aim at the water flow content at a certain moment, even if repeated sampling is carried out for a plurality of times, errors still exist, but the external pump sampling can reduce the errors, but the external pump needs extra energy consumption, the operation is inconvenient, and especially, the sampling cost is high and the manual intervention is more aiming at the fluid sampling with long time span.

Disclosure of Invention

Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model may be realized and attained by the structure particularly pointed out in the written description and drawings hereof.

The utility model aims to overcome the defects, and provides a uniform sampling device and a calibration method thereof, which have the advantages of uniform sample injection, repeated utilization, less manual intervention and low sampling cost, and can accurately control the sampling time, so that the correlation degree between a sample and time is high and the sample is more approximate to the whole.

In a first aspect, the utility model provides a uniform sampling device, comprising an outer shell with a shielding cover at the top, a collecting element arranged in the outer shell, a sampling assembly comprising a collecting sealing element and a sampling tube, a drainage assembly comprising a drainage tube, a flow blocking assembly comprising a flow limiting tube, an opening connected with the collecting sealing element arranged on the collecting element, the sampling tube comprising a sampling end arranged outside the outer shell and a sampling end arranged inside the collecting element and penetrating through the collecting sealing element, the drainage tube comprising a flow inlet end and a flow outlet end arranged in the collecting element, the flow limiting tube comprising a fixed end and a free end connected with the flow outlet end, and the flow limiting tube being communicated with the atmosphere through the free end.

The collecting piece is used for collecting the fluid sample, and can be vertically separated from the collecting sealing piece after the collecting piece is full, so that the replacement of the collecting piece is realized, and the use cost is reduced. When fluid sampling is carried out, the whole outer shell is put in the fluid, and as the sampling pipe and the drainage pipe extend from the inside of the collecting bottle to be 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 pressure difference, so that the fluid actively enters the collecting piece from the sampling assembly, at the moment, the original fluid discharge speed in the collecting piece is controlled through the flow blocking assembly, the sampling speed of the collecting piece is indirectly controlled, the sampling device can sample in target time, uniform sampling is realized, automatic sampling can be realized without an external pressure pump, manual intervention is reduced, the correlation between the sample and time is increased, and the error interference of sample data is reduced.

In some embodiments, the choke assembly further comprises a main core tube, the choke tube being helically wound around an outer wall of the main core tube. The choke component is wound on the main core pipe through the choke pipe, so that the movement direction of the discharged fluid is continuously changed, the movement path is prolonged, the speed of the discharged fluid is further changed, and the purpose of controlling the sample injection speed is achieved.

In some embodiments, the free end cross-sectional area is smaller than the fixed end cross-sectional area. The flow blocking assembly may also be configured to control the rate of fluid exiting by reducing the size of the cross-sectional area of the free end that is open to the atmosphere.

In some embodiments, the drainage assembly further comprises a liquid storage cavity, wherein the liquid storage cavity is arranged below the drainage pipe and communicated with the drainage pipe, and a valve is arranged on the liquid storage cavity. The liquid storage cavity is used for collecting sample fluid which inadvertently enters the drainage pipe, is arranged below the drainage pipe, and is more dense than the drainage pipe, so that the sample fluid entering the drainage pipe can stay in the liquid storage cavity to avoid blocking a flow path of the drainage pipe, and meanwhile, a valve is arranged for discharging the sample fluid in the liquid storage cavity.

In some embodiments, the inlet end has a height from the opening that is greater than the height of the sample outlet end from the opening. By utilizing the characteristic that two fluids are mutually insoluble or slightly soluble, when the density of the discharged fluid is smaller than that of the sample fluid, the inflow end is higher than the sample outlet end, so that the collected sample is prevented from flowing out from the inflow end.

In some embodiments, the sample introduction assembly includes a filter coupled to the sample introduction end. The filter element is arranged at the inlet of sample introduction, and is used for primary screening of fluid samples, so that large-volume objects are prevented from entering the blocking pipeline.

In some embodiments, the device further comprises at least one weight symmetrically arranged in the outer shell. When the buoyancy of the fluid to be measured is overlarge, the weight piece can be optionally added, and the gravity of the sampling device is increased, so that the sampling device can float on the fluid at the target water level.

In some embodiments, the outer housing surface is surrounded by buoyancy members. When the buoyancy of the fluid to be measured is too small, the buoyancy piece can be optionally added to increase the buoyancy of the sampling device, so that the liquid level is kept stable.

In some embodiments, at least two flow baffles are disposed at the bottom of the outer housing, and the flow baffles are disposed around the sample inlet end. The baffle piece is arranged around the sample injection end, so that the phenomenon that the water flow directly impacts the filter to influence the bottle filling height and the sample injection stability of the collecting piece is avoided.

In some embodiments, the top side of the outer housing is provided with a handle having two securing loops disposed therein. The handle is convenient for carry and take the sampling device, and the fixed ring is used for marking or fixing the sampling device.

In a second aspect, the present utility model provides a calibration method for calibrating any one of the above uniform sampling devices, including the steps of:

constant pressure of the air storage tank: filling gas into the gas storage tank and keeping the fixed gas pressure;

and (3) equipment connection: connecting the fixed end of the flow limiting pipe in the flow blocking assembly with a gas storage tank, and connecting the free end into a measuring cylinder reversely buckled in water;

timing of drainage: opening the air storage tank, observing the change of the liquid level in the measuring cylinder, starting timing when the liquid level reaches a target initial water level, stopping timing when the water level drops to a target end water level, and finally closing the air storage tank, recording the water level drop time and the water level change quantity, and obtaining the exhaust speed;

and (3) adjusting and calibrating: comparing the exhaust speed with the target exhaust speed, selecting any one of the diameter, the material, the number of rotation winding turns, the diameter of the rotation track and the free end area of the current limiting pipeline for adjustment, and repeating the water discharge timing to obtain the target exhaust speed.

Through calibrating the flow limiting pipe in the choke component, the discharge speed of the discharged fluid can be tested, different flow limiting pipes can be selected according to different sampling requirements, the flow of the discharged fluid can be regulated to be micro, the accurate control of the sampling time is realized, and the manual intervention is reduced.

By adopting the technical scheme, the utility model has the beneficial effects that:

1. through setting up the collecting bottle of inversion in the shell body, utilize the hydraulic pressure difference to realize the collection of sample fluid, need not external pump and the collecting bottle can replace and use moreover, and the sampling cost is low, manual intervention is few.

2. Through setting up the current limiting component and calibrating the current limiting component, realize discharging the accurate control of fluid, and then accurate control sampling time makes sampling device can evenly advance the sample, obtains the sample and more represents.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

It is apparent that these and other objects of the present utility model will become more apparent from the following detailed description of the preferred embodiments, which is to be read in connection with the accompanying drawings and figures.

The foregoing and other objects, features and advantages of the utility model will be apparent from the following more particular description of the preferred embodiments, as illustrated in the accompanying drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the utility model, and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the embodiments of the utility model, serve to explain the utility model, without limitation to the utility model.

In the drawings, like parts are designated with like reference numerals and are illustrated schematically and are not necessarily drawn to scale.

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only one or several embodiments of the utility model, and that other drawings can be obtained according to such drawings without inventive effort to a person skilled in the art.

FIG. 1 is a schematic diagram of the overall structure of a uniform sampling device according to the present utility model;

FIG. 2 is a schematic view of the internal structure of a choke assembly of the overall structure of a uniform sampling device according to the present utility model 1;

FIG. 3 is a schematic view of the internal structure of a choke assembly of the uniform sampling device according to the present utility model;

FIG. 4 is a schematic view of the internal structure of a choke assembly of the uniform sampling device according to the present utility model;

FIG. 5 is a bottom view of a uniform sampling device according to the present utility model;

FIG. 6 is a diagram showing the instrument connection of a calibration method for a uniform sampling device according to the present utility model.

The main reference numerals illustrate:

1. an outer housing;

11. a shielding cover;

2. a collection member;

3. a sample injection assembly;

31. collecting the seal;

32. a sample inlet tube;

321. sample introduction end, 322. Sample discharge end;

33. a filter;

4. a drainage assembly;

41. a drainage tube;

411. a flow inlet end, 412 a flow outlet end;

42. a liquid storage cavity;

43. a valve;

5. a choke assembly;

51. a flow limiting pipe;

511. fixed end 512 free end;

52. a main core pipe;

6. a weight member;

7. a buoyancy member;

8. a flow baffle;

9. a gas storage tank;

10. a measuring cylinder;

11. exhaust valve

12. Handle

121. And a fixing ring.

Detailed Description

In order to make the objects, technical solutions and advantages of the present utility model more apparent, the present utility model will be further described in detail with reference to the following detailed description. It should be understood that the detailed description is presented merely to illustrate the utility model, and is not intended to limit the utility model.

In addition, in the description of the present utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. However, it is noted that direct connection indicates that the two bodies connected together do not form a connection relationship through a transition structure, but are connected together to form a whole through a connection structure. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Referring to fig. 1, fig. 1 is a schematic diagram of an overall structure of a uniform sampling device according to the present utility model.

The utility model provides a uniform sampling device which comprises an outer shell 1, a collecting piece 2, a sample injection assembly 3, a drainage assembly 4 and a flow blocking assembly 5.

The top of shell body 1 is equipped with and shelters from lid 11, and shelter from lid 11 and shell body 1's connected mode includes arbitrary one such as but not limited to threaded connection, joint, hinge connection, should shelter from lid 11 and be used for rain-proof dustproof, and the top side of this shell body 1 is equipped with handle 12, is equipped with two solid fixed rings 121 in this handle 12. The collecting member 2 provided in the outer casing 1 is provided with an opening, and the collecting member 2 is a column-shaped body with a certain hardness, and the material of the collecting member includes, but is not limited to, any one of plastic, glass, stainless steel, and the like. The sample feeding assembly 3 comprises a collecting sealing member 31 and a sample feeding tube 32 which are connected with an opening, wherein the connection mode between the opening and the collecting sealing member 31 comprises any one of threaded connection, nested connection and the like. The sampling tube 32 includes a sampling end 321 located outside the casing 1 and a sampling end 322 located inside the collecting member 2, where the sampling end 322 is fixedly connected with the collecting sealing member 31, and the sampling tube 32 is used for sampling fluid circulation. The drainage assembly 4 comprises a drainage tube 41, wherein the drainage tube 41 comprises a flow inlet end 411 and a drainage end 412 which are arranged in the collecting piece 2, and the drainage tube 41 is used as a channel for the original fluid in the collecting piece 2 to flow by being extruded by the sample fluid. The choke assembly 5 comprises a choke tube 51, the choke tube 51 comprising a fixed end 511 connected to the discharge end 412 and a free end 512 in communication with the atmosphere.

Referring to fig. 2, fig. 2 is a schematic view 1 illustrating an internal structure of a choke assembly 5 of an overall structure of a uniform sampling device according to the present utility model.

According to some embodiments of the present utility model, the choke assembly 5 further comprises a main core tube 52, the main core tube 52 is a tube with a diameter of 3-5mm, the flow limiting tube 51 is spirally wound on the outer wall of the main core tube 52, the flow limiting tube 51 is preferably a teflon tube with a diameter of 0.1mm, and the inner wall of the tube has a certain roughness.

Referring to fig. 3-4, fig. 3 is a schematic view showing an internal structure of a choke assembly 5 of an overall structure of a uniform sampling device according to the present utility model; FIG. 4 is a schematic view of the internal structure of the choke assembly 5 of the uniform sampling device according to the present utility model.

According to some embodiments of the present utility model, the cross-sectional area of the free end 512 is optionally smaller than that of the fixed end 511, so that the diameter area of the tube is continuously or discontinuously reduced from the fixed end 511 to the free end 512, and the diameter of the tube 51 is 1mm, and the material of the tube is one or two combinations of stainless steel tube, synthetic ruby, and the like, and the reducing manner includes any one of flattening a tube near one side of the free end 512, shrinking the cross-sectional area of the free end 512 in a V shape, and the like.

According to some embodiments of the present utility model, the drain assembly 4 optionally further includes a liquid storage chamber 42, where the liquid storage chamber 42 is provided with a valve 43 and is disposed below the drain pipe 41 and is in communication with the drain pipe 41, and the liquid storage chamber 42 may be integrally formed with the drain pipe 41 or may be connected through a pipe, and the valve 43 may be communicated to drain water from the side wall of the outer housing 1.

According to some embodiments of the present utility model, optionally, the height of the inlet end 411 from the opening is greater than the height of the outlet end 322 from the opening, and since the sampling fluid and the discharging fluid are complementary and compatible or slightly soluble, and the density of the discharging fluid is smaller than that of the sampling fluid, when the sampling fluid enters the collection bottle through the pressure difference, the discharging fluid is expelled from the inlet end 411 by being expelled, so that the height of the inlet end 411 is higher than the height of the outlet end 322, the original fluid in the collection member 2 is conveniently discharged, and the target sampling water level is slightly lower than the inlet end 411.

According to some embodiments of the present utility model, optionally, the sample feeding assembly 3 includes a filter member 33, where the filter member 33 may be selectively installed on the sample feeding tube 32 according to kinds, and preferably connected to the sample feeding end 321 on the sample feeding tube 32, and the filter member 33 may be a filter box formed by a filter screen with relatively small mesh, or may be a transition device containing chemicals capable of filtering non-target samples.

According to some embodiments of the utility model, optionally, at least one weight 6 is further included, the weight 6 being provided within the outer housing 1. The weight member 6 has a certain weight, and since there is enough accommodation space in the outer casing 1, the number of accessories can be adjusted according to the requirement, the weight is symmetrically placed when being balanced, so that the sampling device is kept in a horizontal state, the liquid level height of the sampling device in the fluid to be sampled is adjusted by adjusting the weight member 6, the liquid level height is lower than the position of the drainage end 412, and the vertical distance between the liquid level height and the beating end is larger along with the increase of the volume of the collecting member 2.

According to some embodiments of the utility model, the outer housing 1 is optionally provided with buoyancy elements 7 on its surface. The buoyancy member 7 is made of a material having a large buoyancy and is disposed at a target initial water level position. The buoyancy member 7 is matched with the weight member 6, and the condition sampling device is arranged on the water level line of the fluid to be tested.

Referring to fig. 5, fig. 5 is a bottom view of a uniform sampling device according to the present utility model.

According to some embodiments of the present utility model, optionally, at least one baffle 8 is disposed at the bottom of the outer housing 1, and the baffle 8 is disposed around the sample introduction end 321, where the baffle 8 is preferably a rectangular plate with an arc.

Referring to fig. 6, fig. 6 is an instrument connection diagram of a calibration method of the uniform sampling device according to the present utility model.

The utility model provides a calibration method for calibrating the uniform sampling device, which comprises the following steps:

the constant pressure of the air storage tank 9: filling the gas reservoir 9 with a gas, preferably nitrogen, and maintaining a fixed gas pressure;

and (3) equipment connection: the fixed end 511 of the flow limiting pipe 51 in the flow blocking assembly 5 is connected with a constant pressure air storage tank 9, the air is preferably nitrogen, the free end 512 is connected into a measuring cylinder 10 which is reversely buckled in water, and one end, far away from the free end 512, of the measuring cylinder 10 is provided with an exhaust valve 11;

timing of drainage: opening the air storage tank 9, observing the change of the liquid level in the measuring cylinder 10, starting timing when the liquid level reaches a target initial water level, stopping timing when the water level drops to a target end water level, finally closing the air storage tank 9, recording the water level drop time and the water level change quantity, obtaining the exhaust speed, and emptying the air in the measuring cylinder 10 through the exhaust valve 11 after the experiment is finished;

and (3) adjusting and calibrating: comparing the exhaust speed with the target exhaust speed, selecting any one of the diameter, material, number of windings, diameter of the rotating track and free end area of the flow-limiting pipe 51 for adjustment, and repeating the water discharge timing to obtain the target exhaust speed.

Example 1

The embodiment 1 provides a uniform sampling device, which comprises an outer shell 1, a collecting piece 2, a sample injection assembly 3, a drainage assembly 4, a flow blocking assembly 5, a weight piece 6, a buoyancy piece 7 and a flow blocking piece 8.

The top of shell body 1 is equipped with shelters from lid 11, shelters from lid 11 and shell body 1 through threaded connection. The top side of the outer housing 1 is provided with a handle 12, and two fixing rings 121 are provided in the handle 12.

The collecting piece 2 arranged in the outer shell 1 is provided with an opening, and the collecting piece 2 is a plastic columnar body with certain hardness.

The sample feeding assembly 3 comprises a collection seal 31, a sample feeding tube 32 and a filter 33 connected to the opening. The opening is in threaded sealing connection with the collecting sealing piece 31, and a gasket is arranged between the opening and the collecting sealing piece 31. The sampling tube 32 comprises a sampling end 321 positioned outside the outer shell 1 and a sampling end 322 positioned inside the collecting piece 2, the sampling end 322 is fixedly connected with the collecting sealing piece 31, and the filtering piece 33 is a filtering box formed by a filtering net with smaller meshes.

The drainage assembly 4 comprises a drainage pipe 41 and a liquid storage cavity 42, the drainage pipe 41 comprises a flow inlet end 411 and a flow outlet end 412 which are arranged in the collecting piece 2, the height from the flow inlet end 411 to the opening is larger than the height from the sample outlet end 322 to the opening, and the liquid storage cavity 42 is provided with a valve 43 and is arranged below the drainage pipe 41 and communicated with the drainage pipe 41.

The choke assembly 5 comprises a choke tube 51 and a main core tube 52, wherein the choke tube 51 comprises a fixed end 511 connected with a drainage end 412 and a free end 512 communicated with the atmosphere, the main core tube 52 is a pipeline with the diameter of 4mm, the choke tube 51 is spirally wound on the outer wall of the main core tube 52, the choke tube 51 is preferably a teflon tube with the diameter of 0.1mm, and the inner wall of the tube has certain roughness.

The two weight pieces 6 are symmetrically arranged in the outer shell 1, the buoyancy piece 7 is annularly arranged on the surface of the outer shell 1, and the baffle piece 8 is a rectangular plate with radian and is arranged around the sample inlet 321 and the filter piece 33.

The embodiment 1 provides a calibration method for calibrating the uniform sampling device, which comprises the following steps:

the constant pressure of the air storage tank 9: filling nitrogen into the gas storage tank 9 and maintaining a fixed gas pressure;

and (3) adjusting and calibrating: comparing the exhaust speed with the target exhaust speed, selecting the number of rotation windings or the diameter of the rotation track of the flow-limiting pipe 51, that is, the diameter of the main core, and adjusting, and repeating the water discharge timing to obtain the target exhaust speed.

Example 2

The difference between this embodiment 2 and embodiment 1 is that this embodiment has no buoyancy member 7, unlike the choke assembly 5.

Embodiment 2 provides a uniform sampling device, which comprises an outer shell 1, a collecting piece 2, a sample injection assembly 3, a drainage assembly 4, a flow blocking assembly 5, a weight piece 6 and a flow blocking piece 8.

Referring to fig. 3, fig. 3 is a schematic view 2 of the internal structure of a choke assembly 5 of the overall structure of a uniform sampling device according to the present utility model;

the choke assembly 5 comprises a choke tube 51, the choke tube 51 comprises a fixed end 511 connected with a drain end 412 and a free end 512 communicated with the atmosphere, the choke tube 51 is a stainless steel tube with the diameter of 1mm, and a pipeline near one side of 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.

The two weight pieces 6 are symmetrically arranged in the outer shell 1, and the baffle piece 8 is a rectangular plate with radian and is arranged around the sample inlet 321.

The embodiment 2 provides a calibration method for calibrating the uniform sampling device, which comprises the following steps:

and (3) adjusting and calibrating: comparing the exhaust speed with the target exhaust speed, selecting the free end area of the flow-limiting pipe 51 for adjustment, and repeating the water discharge timing to obtain the target exhaust speed.

Example 3

The difference between this embodiment 3 and embodiment 1 is that: the present embodiment differs from the no weight 6 and the choke assembly 5.

Embodiment 3 provides a uniform sampling device, which comprises an outer shell 1, a collecting piece 2, a sample injection assembly 3, a drainage assembly 4, a flow blocking assembly 5, a buoyancy piece 7 and a flow blocking piece 8.

Referring to fig. 4, fig. 4 is a schematic view of the internal structure of a choke assembly 5 of the overall structure of a uniform sampling device according to the present utility model.

The choke assembly 5 comprises a choke tube 51, the choke tube 51 comprises a fixed end 511 connected with a drainage end 412 and a free end 512 communicated with the atmosphere, the diameter area of the choke tube 51 is continuously reduced in a V shape in the process from the fixed end 511 to the free end 512, so that the cross section area of the free end 512 is smaller than that of the fixed end 511, and at the moment, the V-shaped end of the choke tube 51 is made of artificially synthesized ruby, so that the cross section area of the free end 512 is 0.025mm, and the cross section area of the fixed end 511 is 1mm.

The buoyancy member 7 is annularly arranged on the surface of the outer shell 1, and the baffle member 8 is a rectangular plate with radian and is arranged around the sample introduction end 321.

The embodiment 3 provides a calibration method for calibrating the uniform sampling device, which comprises the following steps:

the constant pressure of the air storage tank 9: filling nitrogen gas into the gas storage tank 9 and keeping a fixed gas pressure;

and (3) adjusting and calibrating: comparing the exhaust speed with the target exhaust speed, selecting the free end area of the flow limiting pipeline for adjustment, and repeating the water discharge timing to obtain the target exhaust speed.

It is to be understood that the disclosed embodiments are not limited to the specific process steps or materials disclosed herein, but are intended to extend to equivalents of such features as would be understood by one of ordinary skill in the relevant arts. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.

Reference in the specification to "an embodiment" means that a particular feature, or characteristic, described in connection with the embodiment is included in at least one embodiment of the utility model. Thus, appearances of the phrase or "an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment.

Furthermore, the described features or characteristics may be combined in any other suitable manner in one or more embodiments. In the above description, certain specific details are provided, such as thicknesses, numbers, etc., to provide a thorough understanding of embodiments of the utility model. One skilled in the relevant art will recognize, however, that the utility model can be practiced without one or more of the specific details, or with other methods, components, materials, etc.

Claims

1. A uniform sampling device, comprising:

the top of the outer shell is provided with a shielding cover;

the collecting piece is arranged in the outer shell and is provided with an opening;

the sample injection assembly comprises a collecting sealing piece and a sample injection tube, the collecting sealing piece is connected with the opening, the sample injection tube comprises a sample injection end and a sample outlet end, the sample injection end is positioned outside the outer shell, and the sample outlet end passes through the collecting sealing piece and is positioned inside the collecting piece;

the drainage assembly comprises a drainage pipe, the drainage pipe comprises a flow inlet end and a drainage end, and the flow inlet end is arranged in the collecting piece;

the choke assembly comprises a choke tube, wherein the choke tube comprises a fixed end and a free end, the fixed end is connected with the drainage end, and the choke tube is communicated with the atmosphere through the free end.

2. The uniform sampling device of claim 1, wherein the choke assembly further comprises a main core tube, the choke tube being helically wound around an outer wall of the main core tube.

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

4. The uniform sampling device of claim 1, wherein the drainage assembly further comprises a reservoir chamber disposed below and in communication with the drainage tube, the reservoir chamber having a valve disposed thereon.

5. The uniform sampling device of claim 1, wherein the inlet end has a greater height from the opening than the outlet end.

6. The uniform sampling device of claim 1, wherein the sample introduction assembly comprises a filter member coupled to the sample introduction end.

7. The uniform sampling device of claim 1, further comprising at least two weight members symmetrically disposed within the outer housing.

8. The uniform sampling device according to claim 1, wherein the outer housing surface is surrounded by buoyancy elements.

9. The uniform sampling device according to claim 1, wherein the bottom of the outer housing is provided with at least two flow baffles disposed around the sample introduction end.

10. The uniform sampling device according to claim 1, wherein a handle is provided on the top side of the outer housing, and two securing rings are provided in the handle.