CN221674333U - Sampling device - Google Patents

Abstract

The utility model provides a sampler, which comprises a first liquid storage barrel with an inlet and an outlet, a second liquid storage barrel, a first piston, a second piston, a first piston rod and a second piston rod, wherein the second liquid storage barrel is connected with the upper end of the first liquid storage barrel and has a diameter larger than that of the first liquid storage barrel; the first piston and the second piston are detachably and hermetically connected, and the first piston can be separated from the second piston to slide in the first liquid storage cylinder, or the first piston and the second piston are connected into a whole and slide in the second liquid storage cylinder along with the second piston. According to the utility model, the inlet and outlet with larger diameters and the first liquid storage barrel are arranged, so that the caliber of the inlets of the first liquid storage barrel and the second liquid storage barrel is increased, liquid can not be extruded, bubbles are prevented from being generated when viscous liquid enters the first liquid storage barrel and the second liquid storage barrel, and the bubbles are prevented from being mixed in the viscous liquid.

Description

Sampling device

Technical Field

The utility model belongs to the technical field of liquid sample adding, and particularly relates to a sampler.

Background

In the fields of biology, medical science, basic research, or chemical industry, some solutions are prepared by adding a viscous liquid with a corresponding volume, and a pipette gun and a pipette tip are generally used for sampling the viscous liquid. Because the viscosity of the viscous liquid is large, and the opening of the tip of the pipette tip is small, a large amount of bubbles can be generated by squeezing the liquid during inhalation, so that the volume is inaccurate; if the gun head is cut off by scissors, the caliber of the tip is enlarged, the probability of generating bubbles can be reduced by careful slow suction, but the speed is greatly reduced. And when the viscous liquid is beaten out for sample application, a lot of viscous liquid can remain on the inner wall of the pipetting gun head, and the sample application is inaccurate. In an actual working scene, large-scale sample loading is often required, an operator cannot guarantee precision and speed at the same time, and accurate sample loading cannot be achieved, so that the problem needs to be solved.

For example, CN202220016581.8 discloses a liquid-transferring device for preparing biomedical electronic microscope, which comprises a liquid-transferring cylinder, the inner cavity of the liquid-transferring cylinder is slidably connected with a sliding rod, the bottom end of the sliding rod is fixedly connected with a sealing plug, the bottom of the liquid-transferring cylinder is communicated with a liquid-discharging connecting pipe, the periphery of the liquid-discharging connecting pipe is provided with an external thread, and the periphery of the liquid-discharging connecting pipe is connected with a gun head. The liquid pump is used for pumping or injecting liquid through the cooperation of the liquid transfer cylinder, the sliding rod and the sealing plug. However, in the above-mentioned patent publication, the liquid is directly sucked into the pipetting cylinder for storage through the gun head, and because the caliber of the gun head at the front end is smaller, bubbles are easily generated when the viscous liquid is sucked into the pipetting cylinder for storage, and the use of the viscous liquid is affected due to the fact that the bubbles are mixed in the viscous liquid; when the viscous liquid is pushed out, part of the viscous liquid remains on the inner wall of the pipetting cylinder, so that the actual sample addition is different from the read value, and the sample addition is inaccurate.

Disclosure of utility model

The utility model aims to solve the technical problems in the prior art, and aims to provide a sampler.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the sampler comprises a first liquid storage cylinder, a second liquid storage cylinder, a first piston, a second piston, a first piston rod and a second piston rod, wherein the lower end of the first liquid storage cylinder is provided with an inlet and an outlet, the second liquid storage cylinder is connected with the upper end of the first liquid storage cylinder and is communicated with the first liquid storage cylinder, the diameter of the second liquid storage cylinder is larger than that of the first liquid storage cylinder, the first piston is connected in the first liquid storage cylinder in a sliding manner and is connected with the first liquid storage cylinder in a sealing manner, the second piston is connected in the second liquid storage cylinder in a sliding manner and is connected with the second liquid storage cylinder in a sealing manner, the first piston rod is fixedly connected with the upper end of the first piston, the second piston rod is fixedly connected with the upper end of the first piston, and the second piston rod is fixedly connected with the upper end of the second piston, and the first liquid storage cylinder and the second liquid storage cylinder are made of transparent or semitransparent materials; the middle of the second piston is provided with a connecting hole matched with the appearance of the first piston, the first piston is detachably and hermetically connected with the connecting hole, the first piston rod passes through the connecting hole and extends upwards to the outside of the second liquid storage cylinder, the first piston can be separated from the second piston to slide in the first liquid storage cylinder, or the first piston and the second piston are connected into a whole and slide in the second liquid storage cylinder along with the second piston.

According to the technical scheme, the inlet and the outlet are formed in the lower end of the first liquid storage barrel, the caliber of the inlet and the outlet is larger than that of the gun head of the liquid transfer device, liquid cannot be extruded, so that viscous liquid entering the first liquid storage barrel cannot generate bubbles, the caliber of the inlet of the second liquid storage barrel is increased by arranging the first liquid storage barrel, liquid cannot be extruded, bubbles are prevented from being generated when the viscous liquid enters the second liquid storage barrel, and bubbles are prevented from being mixed in the viscous liquid. The first liquid storage cylinder is small in size and suitable for carrying out the sample adding of the viscous liquid with small size, the second liquid storage cylinder is large in size and capable of storing more viscous liquid, and the device is suitable for adding the viscous liquid with large size and can further realize continuous sample adding for many times.

In a preferred embodiment of the utility model, sealing rings are embedded on the outer walls of the first piston and the second piston.

According to the technical scheme, the sealing ring on the outer wall of the first piston is used for sealing the first piston with the inner wall of the first liquid storage barrel and the inner wall of the first piston and the connecting hole, and the sealing ring on the outer wall of the second piston is used for sealing the second piston with the inner wall of the second liquid storage barrel, so that the structure is simple.

In a preferred embodiment of the utility model, the second piston rod is a sleeve arranged in a hollow mode, and the lower end of the second piston rod is fixedly connected with the second piston and sleeved outside the first piston rod.

According to the technical scheme, the second piston rod adopts the sleeve structure, so that the stress is more uniform, and the second piston slides in the second liquid storage barrel more smoothly.

In a preferred embodiment of the present utility model, a first handle extending radially outward is fixedly connected to the upper end of the first piston rod, a second handle extending radially outward is fixedly connected to the upper end of the second piston rod, and a third handle extending radially outward is fixedly connected to the upper end of the second liquid storage barrel.

According to the technical scheme, the first handle, the second handle and the third handle are arranged, so that a user can apply force conveniently when using the sampler.

In a preferred embodiment of the present utility model, the first reservoir and the second reservoir are both cylindrical and are coaxially disposed.

In another preferred embodiment of the utility model, the inner wall of the top of the connecting hole is provided with a step which can limit the first piston.

According to the technical scheme, when the first piston is embedded into the connecting hole and connected with the second piston into a whole, the step is used for limiting the upper end of the first piston, so that the first piston is prevented from being separated from the second piston when moving upwards.

In another preferred embodiment of the utility model, the inner wall of the connecting bore has an internal thread and the outer wall of the first piston has an external thread which can engage with the internal thread.

According to the technical scheme, when the first piston is embedded into the connecting hole of the second piston, the first piston is rotated to enable the first piston and the second piston to be in threaded connection, so that the first piston and the second piston are prevented from being separated due to the fact that the piston rod is wrongly operated when liquid is sucked into the second liquid storage cylinder or pushed out of the second liquid storage cylinder.

In another preferred embodiment of the utility model, the outer wall of the first reservoir and/or the second reservoir is provided with a metering scale.

According to the technical scheme, the liquid quantity emitted from the sampler is conveniently measured through the measuring scale.

In another preferred embodiment of the utility model, a first annular scraping blade made of flexible material in interference fit with the inner wall of the first liquid storage barrel is fixedly connected to the edge of the lower end of the first piston, and a second annular scraping blade made of flexible material in interference fit with the inner wall of the second liquid storage barrel is fixedly connected to the edge of the lower end of the second piston.

According to the technical scheme, when the liquid in the second liquid storage barrel is pushed out, the second annular scraping blade scrapes the liquid on the inner wall of the second liquid storage barrel, and when the liquid in the first liquid storage barrel is pushed out, the first annular scraping blade scrapes the liquid on the inner wall of the first liquid storage barrel, so that sample adding is more accurate; the first annular scraping blade/the second annular scraping blade can be closely attached to the inner walls of the first liquid storage cylinder/the second liquid storage cylinder to scrape liquid, so that air between the viscous liquid and the first piston/the second piston during pushing is prevented from generating bubbles to the greatest extent.

In another preferred embodiment of the utility model, the lower end of the first piston has a first chamfer on which the first annular wiper is disposed, and the lower end of the second piston has a second chamfer on which the second annular wiper is disposed.

Above-mentioned technical scheme is through setting up first chamfer for the lower extreme of first piston can be with the bottom contact of first stock solution section of thick bamboo, through setting up the second chamfer, makes the lower extreme of second piston can be with the bottom contact of second stock solution section of thick bamboo, guarantees that the liquid in first stock solution section of thick bamboo and the second stock solution section of thick bamboo is whole to be released, does not remain.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

Fig. 1 is a schematic diagram of a sampler according to an embodiment, in which a first piston is separated from a second piston.

Fig. 2 is a schematic diagram of a second embodiment of the sampler, in which the first piston and the second piston are integrally connected.

Fig. 3 is a schematic diagram of the external structure of the sampler of the embodiment.

Reference numerals in the drawings of the specification include: the device comprises a first liquid storage barrel 1, an inlet and outlet 1a, a metering scale 1b, a second liquid storage barrel 2, a third handle 2a, a first piston 3, a second piston 4, a connecting hole 4a, a step 4b, a first piston rod 5, a first handle 5a, a second piston rod 6, a second handle 6a, a first annular scraping blade 7, a second annular scraping blade 8 and a sealing ring 9.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "longitudinal," "transverse," "vertical," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the utility model.

In the description of the present utility model, unless otherwise specified and defined, it should be noted that the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, mechanical or electrical, or may be in communication with each other between two elements, directly or indirectly through intermediaries, as would be understood by those skilled in the art, in view of the specific meaning of the terms described above.

The utility model provides a sampler, as shown in fig. 1 and 2, in a preferred embodiment, the sampler comprises a first liquid storage cylinder 1 with an inlet and an outlet 1a at the lower end, a second liquid storage cylinder 2 which is connected with the upper end of the first liquid storage cylinder 1 and communicated with the first liquid storage cylinder 1 and has a diameter larger than that of the first liquid storage cylinder 1, a first piston 3 which is connected in the first liquid storage cylinder 1 in a sliding way and is connected with the first liquid storage cylinder in a sealing way, a second piston 4 which is connected in the second liquid storage cylinder 2 in a sliding way and is connected with the second liquid storage cylinder in a sealing way, a first piston rod 5 fixedly connected with the upper end of the first piston 3, and a second piston rod 6 fixedly connected with the upper end of the second piston 4. The first liquid storage cylinder 1 and the second liquid storage cylinder 2 are cylindrical cylinders and are coaxially arranged, and the first liquid storage cylinder 1 and the second liquid storage cylinder 2 are made of transparent or semitransparent materials so as to observe the condition of liquid (the liquid refers to viscous liquid) in the liquid storage cylinders. As shown in fig. 3, preferably, the outer walls of the first liquid storage cylinder 1 and the second liquid storage cylinder 2 are provided with a metering scale 1b, so that the liquid quantity emitted from the sampler is conveniently metered.

The middle of the second piston 4 is provided with a connecting hole 4a matched with the appearance of the first piston 3, the first piston 3 can be embedded into the connecting hole 4a and is detachably and hermetically connected with the connecting hole 4a, the first piston rod 5 passes through the connecting hole 4a and extends upwards to the outside of the second liquid storage barrel 2, the first piston 3 can be separated from the second piston 4 to slide in the first liquid storage barrel 1, or the first piston 3 and the second piston 4 are connected into a whole and slide in the second liquid storage barrel 2 along with the second piston 4.

When the sampler is used for loading smaller volumes of liquid (such as viscous liquid), the first piston 3 is separated from the second piston 4, and the first piston 3 is positioned at the lowest end of the first liquid storage barrel 1. The user places the inlet and outlet 1a of first stock solution section of thick bamboo 1 lower extreme in the liquid that waits to absorb, then makes first piston 3 upwards move in first stock solution section of thick bamboo 1 through first piston rod 5, and under the effect of negative pressure, liquid is inhaled in first stock solution section of thick bamboo 1, because the bore of inlet and outlet 1a is bigger than the pipettor rifle head, can not extrude liquid, makes the viscous liquid that gets into first stock solution section of thick bamboo 1 can not produce the bubble. Then the first piston 3 is moved downwards through the first piston rod 5 so as to eject the liquid in the first liquid storage cylinder 1 from the inlet and outlet 1a, and sample loading reading is realized by observing the metering scale 1b of the first liquid storage cylinder 1.

When the sampler is used for sampling a large volume of viscous liquid, the second piston 4 is positioned at the lowest end of the second liquid storage barrel 2, when the first piston 3 moves upwards into the second liquid storage barrel 2 to enable the first liquid storage barrel 1 to be full of liquid, the second piston rod 6 is pressed down, the first piston 3 is embedded into the connecting hole 4a and connected with the second piston 4 into a whole, and then the second piston 4 moves upwards through the second piston rod 6 or the first piston rod 5 to suck the liquid into the second liquid storage barrel 2, so that the caliber of an inlet of the second liquid storage barrel 2 is increased by the first liquid storage barrel 1, the liquid is not extruded, and bubbles are prevented from being generated when the viscous liquid enters the second liquid storage barrel 2. Then the second piston 4 moves downwards through the second piston rod 6 or the first piston rod 5 so as to eject the liquid in the second liquid storage barrel 2 from the inlet and outlet 1a after passing through the first liquid storage barrel 1, and the sample loading reading is realized by observing the metering scale 1b of the second liquid storage barrel 2. When the viscous liquid in the first liquid storage cylinder 1 is needed to be pushed out continuously, when the first piston 3 moves downwards along with the second piston 4 to the bottom of the second liquid storage cylinder 2, the first piston 3 is separated from the connecting hole 4a of the second piston 4, and the first piston 3 moves downwards through the first piston rod 5 so as to eject the liquid in the first liquid storage cylinder 1 from the inlet and outlet 1 a.

The sampler of the utility model can realize the accurate sample adding and can also realize continuous sample adding. For example, the first liquid storage cylinder 1 and the second liquid storage cylinder 2 absorb more than 20mL of liquid together, if the liquid is required to be split into 200 parts of reaction systems, 100u l volumes of liquid are added into each part, and continuous and accurate sample adding can be realized by using the sampler without repeatedly absorbing and adding 200 times.

In the utility model, sealing rings 9 are embedded on the outer walls of the first piston 3 and the second piston 4, for example, annular grooves are formed on the outer walls of the first piston 3 and the second piston 4, the sealing rings 9 are clamped and fixed in the annular grooves, the sealing between the first piston 3 and the inner wall of the first liquid storage barrel 1 and the sealing between the first piston 3 and the inner wall of the connecting hole 4a are realized by the sealing rings 9 on the outer wall of the first piston 3, and the sealing between the second piston 4 and the inner wall of the second liquid storage barrel 2 is realized by the sealing rings 9 on the outer wall of the second piston 4.

In the utility model, the second piston rod 6 is a hollow sleeve, the lower end of the second piston rod 6 is fixedly connected with the second piston 4 and sleeved outside the first piston rod 5, and the upper end of the first piston rod 5 extends to the outside of the upper end of the second piston rod 6. Preferably, a first handle 5a extending radially outwardly is fixedly attached to the upper end of the first piston rod 5, thereby facilitating the up-and-down movement of the first piston rod 5 by the first handle 5 a; a second handle 6a extending radially outwardly is fixedly attached to the upper end of the second piston rod 6, thereby facilitating the up-and-down movement of the second piston rod 6 by the second handle 6 a; a third handle 2a extending radially outwards is fixedly connected to the upper end of the second liquid storage barrel 2, so that a user can apply force when using the sampler.

In the utility model, the inner wall of the top of the connecting hole 4a is provided with the step 4b capable of limiting the first piston 3, and when the first piston 3 is embedded into the connecting hole 4a and connected with the second piston 4 into a whole, the step 4b limits the upper end of the first piston 3. At this time, when the first piston 3 and the second piston 4 need to move upward, the first piston rod 5 is lifted up; when the first piston 3 and the second piston 4 need to be moved downward, the second piston rod 6 is pressed down.

Preferably, the inner wall of the connecting hole 4a is provided with an internal thread, the outer wall of the first piston 3 is provided with an external thread capable of being meshed with the internal thread, and when the first piston 3 is embedded in the connecting hole 4a of the second piston 4, the first piston 3 and the second piston 4 are in threaded connection into a whole by rotating the first piston 3, so that when the first piston 3 and the second piston 4 are moved upwards, the first piston rod 5 or the second piston rod 6 can be lifted; by depressing either the first piston rod 5 or the second piston rod 6 when the first piston 3 and the second piston 4 are moved downward.

It is further preferred that the internal thread is provided on the inner wall of the step 4b of the connecting hole 4a, and accordingly, the upper end of the first piston 3 has an extension inserted into the inner wall of the step 4b, thereby not affecting the installation of the sealing ring 9 on the outer wall of the first piston 3.

In another preferred embodiment of the utility model, the edge of the lower end of the first piston 3 is fixedly connected with a first annular scraping blade 7 made of flexible material in interference fit with the inner wall of the first liquid storage barrel 1, the edge of the lower end of the second piston 4 is fixedly connected with a second annular scraping blade 8 made of flexible material in interference fit with the inner wall of the second liquid storage barrel 2, and the first annular scraping blade 7 and the second annular scraping blade 8 are both made of medical silica gel. When the second piston 4 moves downwards to push out the liquid in the second liquid storage cylinder 2, the second annular scraping blade 8 scrapes the liquid on the inner wall of the second liquid storage cylinder 2, and when the first piston 3 moves downwards to push out the liquid in the first liquid storage cylinder 1, the first annular scraping blade 7 scrapes the liquid on the inner wall of the first liquid storage cylinder 1, so that the actual sample adding is the same as the reading value, and the sample adding is more accurate; the first annular scraping blade 7/the second annular scraping blade 8 can be closely attached to the inner walls of the first liquid storage cylinder 1/the second liquid storage cylinder 2 to scrape liquid, so that air between the viscous liquid and the first piston 3/the second piston 4 during pushing is prevented from generating bubbles to the greatest extent.

Preferably, the lower end of the first piston 3 is provided with a first chamfer, and the first annular scraping blade 7 is arranged on the first chamfer, so that the lower end of the first piston 3 can be in contact with the bottom of the first liquid storage barrel 1, and the liquid in the first liquid storage barrel 1 is completely pushed out without residue; the lower extreme of second piston 4 has the second chamfer, and second annular doctor-bar 8 is established on the second chamfer for the lower extreme of second piston 4 can be with the bottom contact of second reservoir 2, guarantees that the liquid in the second reservoir 2 is whole to be released, does not remain.

According to the utility model, through the complete set of matching design of the large-caliber inlet and outlet 1a, the first liquid storage cylinder 1, the second liquid storage cylinder 2, the metering scale 1b, the first annular scraping blade 7 and the second annular scraping blade 8, accurate, rapid and continuous sample adding of viscous liquid can be realized, and the technical gap is filled.

In the description of the present specification, reference to the terms "preferred implementation," "one embodiment," "some embodiments," "example," "a particular example" or "some examples" and the like 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 utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. The sampler is characterized by comprising a first liquid storage barrel, a second liquid storage barrel, a first piston, a second piston, a first piston rod and a second piston rod, wherein the lower end of the first liquid storage barrel is provided with an inlet and an outlet, the second liquid storage barrel is connected with the upper end of the first liquid storage barrel and is communicated with the first liquid storage barrel, the diameter of the second liquid storage barrel is larger than that of the first liquid storage barrel, the first piston is connected in the first liquid storage barrel in a sliding manner and is connected with the first liquid storage barrel in a sealing manner, the second piston is connected in the second liquid storage barrel in a sliding manner and is connected with the second liquid storage barrel in a sealing manner, the first piston rod is fixedly connected with the upper end of the first piston, the second piston rod is fixedly connected with the upper end of the second piston, and the first liquid storage barrel and the second liquid storage barrel are made of transparent or semitransparent materials;

The middle of the second piston is provided with a connecting hole matched with the appearance of the first piston, the first piston is detachably and hermetically connected with the connecting hole, the first piston rod passes through the connecting hole and extends upwards to the outside of the second liquid storage cylinder, and the first piston can be separated from the second piston to slide in the first liquid storage cylinder or be connected with the second piston into a whole to slide in the second liquid storage cylinder along with the second piston.

2. The sampler of claim 1, wherein sealing rings are embedded on the outer walls of the first piston and the second piston.

3. The sampler of claim 1, wherein the second piston rod is a hollow sleeve, and the lower end of the second piston rod is fixedly connected with the second piston and sleeved outside the first piston rod.

4. The sampler of claim 1, wherein a first handle extending radially outward is fixedly connected to the upper end of the first piston rod, a second handle extending radially outward is fixedly connected to the upper end of the second piston rod, and a third handle extending radially outward is fixedly connected to the upper end of the second reservoir.

5. The sampler of claim 1, wherein the first reservoir and the second reservoir are both cylindrical and are coaxially disposed.

6. The sampler of claim 1, wherein the inner wall of the top of the connecting hole is provided with a step capable of limiting the first piston.

7. The sampler of claim 1, wherein the inner wall of the connecting hole is provided with internal threads, and the outer wall of the first piston is provided with external threads capable of being meshed with the internal threads.

8. The sampler of any one of claims 1-7, wherein the outer wall of the first reservoir and/or the second reservoir is provided with a metering scale.

9. The sampler of any one of claims 1-7, wherein a first annular wiper blade made of a flexible material in interference fit with the inner wall of the first liquid storage barrel is fixedly connected to the edge of the lower end of the first piston, and a second annular wiper blade made of a flexible material in interference fit with the inner wall of the second liquid storage barrel is fixedly connected to the edge of the lower end of the second piston.

10. The sampler of claim 9, wherein the lower end of the first piston has a first chamfer, the first annular wiper is disposed on the first chamfer, the lower end of the second piston has a second chamfer, and the second annular wiper is disposed on the second chamfer.