CN114308169A - Liquid transfer device - Google Patents

Abstract

A liquid transfer device includes a pressing mechanism and a liquid taking assembly, the pressing mechanism includes an upper casing and a lower casing, the upper casing includes a first top wall and a pressing portion, and the first top wall and the lower casing are enclosed to form an accommodation The upper casing is accommodated in the accommodating cavity; the liquid-taking assembly includes a liquid-taking tube, a liquid-taking head and a first connecting part, the liquid-taking assembly extends into the accommodating cavity from the second top wall, and the liquid-taking tube is arranged corresponding to the extrusion part, The first connecting part is detachably arranged on the second top wall, and the liquid taking head is located outside the accommodating cavity. The upper casing moves along the central axis of the accommodating cavity, thereby driving the pressing part to move relative to the liquid taking tube, so that the pressing part abuts or releases the liquid taking tube to realize the liquid transfer. The liquid transfer device of the present invention can absorb the liquid quantitatively; the liquid-taking component can be replaced, the pressing mechanism can be reused, and the cost is saved.

Description

Liquid transfer device

technical field

The present invention relates to the technical field of liquid transfer, in particular to a liquid transfer device.

Background technique

Many existing diagnostic tests involving biological reactions need to be completed in professional laboratories, and the equipment is complex, bulky, costly, and complicated to operate. Operated by skilled technicians, home portable testing cannot be achieved.

SUMMARY OF THE INVENTION

In view of this, in order to solve at least one of the above drawbacks, it is necessary to provide a liquid transfer device.

The invention provides a liquid transfer device, which includes a pressing mechanism and a liquid taking assembly. The pressing mechanism includes an upper casing and a lower casing, the upper casing includes a first side wall and a first top wall connected with the first side wall, and a pressing part is arranged on the first top wall , the lower shell includes a second side wall and a second top wall, the second side wall is connected to the second top wall and surrounds a accommodating cavity, and the upper shell is accommodated in the accommodating cavity . The liquid-taking assembly includes a liquid-taking tube, a liquid-taking head, and a first connecting portion that communicates the liquid-taking tube and the liquid-taking head, and the liquid-taking assembly is used to extend into the accommodating cavity from the second top wall , so that the liquid taking tube is disposed corresponding to the pressing portion, the first connecting portion is detachably disposed on the second top wall, and the liquid taking head is located outside the accommodating cavity. Wherein, the upper casing is used for reciprocating movement along the central axis of the accommodating cavity, thereby driving the pressing portion to move back and forth relative to the liquid taking tube, so that the pressing portion abuts or releases the taking-out tube. The liquid pipe is deformed, so that the liquid pipe can release or absorb the liquid.

In the embodiment of the present application, the lower casing further includes a first liquid-taking through hole and a second connecting portion disposed on the second top wall, and the second connecting portion is disposed on the second top wall and is located around the first liquid taking through hole, when the liquid taking tube extends into the accommodating cavity through the first liquid taking through hole, the first connecting part and the second connecting part can be connected. Remove the connection.

In the embodiment of the present application, the first connection portion and the second connection portion are connected in a snap connection or screw connection.

In an embodiment of the present application, the first connecting portion includes a connecting portion body, a first latching position disposed on the connecting portion body, a guide rod disposed on the connecting portion body, and a clip disposed on the guide rod hook. The second connecting portion includes a first bayonet penetrating the second top wall, a second bayonet penetrating the second top wall and communicating with the first bayonet, and a second bayonet. Wherein, the guide rod extends into the first bayonet from the second top wall and is clamped into the second bayonet, and the latching hook is clamped at a position of the second bayonet close to the accommodating cavity. The first card position is clamped on the side of the second card position away from the accommodating cavity, so that the first connecting portion and the second connecting portion are detachably connected.

In the embodiment of the present application, the pressing portion includes a third side wall, one end of the third side wall is connected to the first top wall, and the third side wall surrounds a second liquid taking through hole, so The second liquid taking through hole is communicated with the first liquid taking through hole and both are coaxial with the accommodating cavity; the aperture of the second liquid taking through hole decreases along the direction away from the second liquid taking through hole , the liquid taking tube is used to extend into or out of the second liquid taking through hole, and the third side wall is used to abut or loosen the liquid taking tube.

In the embodiment of the present application, the inner diameter of the liquid taking tube along the direction perpendicular to the central axis of the accommodating cavity decreases from the end close to the liquid taking head to the end far from the liquid taking head.

In the embodiment of the present application, an inner surface of the third side wall is provided with a pressing block, and the pressing block is used to abut or loosen the liquid taking tube.

In the embodiment of the present application, the pressing mechanism further includes an elastic member that is accommodated in the accommodating cavity, one end of the elastic member is pressed against the first top wall, and the other end of the elastic member is pressed against the second top wall, The elastic restoring force of the elastic member is used to move the upper casing away from the lower casing.

In the embodiment of the present application, there are a plurality of the elastic members, and the plurality of the elastic members are arranged around the liquid taking tube, or the elastic members are sleeved on the outer side of the pressing portion.

In an embodiment of the present application, the liquid transfer device further includes a pressing key, and the pressing key is disposed at an end of the upper casing away from the lower casing.

Compared with the prior art, the liquid transfer device provided by the present invention has a simple structure and simple operation, can achieve quantitative liquid absorption, and can realize the transfer of a small amount of liquid; and the liquid sampling assembly and the pressing mechanism can be detachably arranged, and the pressing mechanism can be used multiple times. , The liquid collection component is a one-time consumable, which can be replaced at any time, saving costs.

Description of drawings

FIG. 1 is a schematic structural diagram of an unpressed liquid transfer device provided by an embodiment of the present invention.

2 is a schematic structural diagram of a liquid transfer device provided by an embodiment of the present invention after being pressed.

3 is an exploded view of a liquid transfer device provided by an embodiment of the present invention.

FIG. 4 is a cross-sectional view along IV-IV of the liquid transfer device provided in FIG. 1 .

FIG. 5 is a cross-sectional view along V-V of the liquid transfer device provided in FIG. 2 .

FIG. 6 is a cross-sectional view along VI-VI of the liquid transfer device provided in FIG. 1 .

7 is a cross-sectional view of a liquid transfer device provided by another embodiment of the present invention.

FIG. 8 is a schematic structural diagram of an upper casing provided by an embodiment of the present invention.

FIG. 9 is a schematic structural diagram of another angle of the upper casing provided by an embodiment of the present invention.

FIG. 10 is a schematic structural diagram of a lower casing provided by an embodiment of the present invention.

FIG. 11 is a schematic structural diagram of another angle of the lower casing provided by an embodiment of the present invention.

FIG. 12 is a schematic structural diagram of a liquid transfer device provided by another embodiment of the present invention.

13 is a cross-sectional view of a liquid transfer device provided by another embodiment of the present invention.

Description of main component symbols

The following specific embodiments will further illustrate the present invention in conjunction with the above drawings.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

It should be noted that when a component is referred to as being "fixed to" another component, it can be directly on the other component or there may also be a centered component. When a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a co-existence of an intervening component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a co-existing centered component. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for illustrative purposes only.

The system implementation described below is only illustrative, and the division of the modules or circuits is only a logical function division, and other division methods may be used in actual implementation. Furthermore, it is clear that the word "comprising" does not exclude other units or steps and the singular does not exclude the plural. Multiple units or means recited in the system claims can also be implemented by one and the same unit or means by means of software or hardware. The terms first, second, etc. are used to denote names and do not denote any particular order.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Please refer to FIG. 1 to FIG. 6 , which are a liquid transfer device 100 provided in an embodiment of the present invention. The liquid transfer device 100 includes a pressing mechanism 10 and a liquid taking assembly 3 . The pressing mechanism 10 includes an upper casing 1 and a lower casing 2. The upper casing 1 includes a first side wall 11 and a first top wall 13 connected to the first side wall 11. The first top wall 13 is provided with a The extrusion part 12, the lower shell 2 includes a second side wall 21 and a second top wall 22, the second side wall 21 is connected to the second top wall 22 and surrounds a receiving cavity 4, the upper shell 1 accommodated in the accommodating cavity 4 . The liquid taking assembly 3 includes a liquid taking pipe 31 , a liquid taking head 32 and a first connection part 33 connecting the liquid taking pipe 31 and the liquid taking head 32 , and the liquid taking assembly 3 is used to be stored away from the second top wall 22 One side of the cavity 4 extends into the accommodating cavity 4, so that the liquid taking tube 31 is disposed corresponding to the pressing portion 12, the first connecting portion 33 is detachably disposed on the second top wall 22, and the liquid taking head 32 is located in the The second top wall 22 is away from the side of the accommodating cavity 4 . The upper casing 1 is used to move back and forth along the central axis a of the accommodating cavity 4, thereby driving the extruding portion 12 to move back and forth relative to the liquid taking pipe 31, so that the extruding portion 12 abuts or releases the liquid taking pipe 31, so that the The liquid taking tube 31 is deformed, so that the liquid taking tube 31 releases or absorbs the liquid. The pressing mechanism 10 of the present invention is pre-assembled, and the liquid-taking assembly 3 extends from the outside of the pressing mechanism 10 through the first liquid-taking through hole 23 into the accommodating cavity 4, so as to be detachably installed on the pressing mechanism 10, and it is convenient to replace the liquid-taking assembly at any time. 3. Specifically, the liquid taking assembly 3 can be a disposable consumable, and the liquid taking assembly 3 can be replaced at any time according to actual needs, and the pressing mechanism 10 can be reused, which can reduce the cost.

Please refer to FIG. 10 and FIG. 11 , the lower casing 2 further includes a first liquid-taking through hole 23 and a second connecting portion 24 disposed on the second top wall 22 , and the second connecting portion 24 is disposed on the second top wall 22 . The top wall 22 is located around the first liquid taking through hole 23 . When the liquid taking tube 31 extends into the accommodating cavity 4 through the first liquid taking through hole 23 , the first connecting portion 33 and the second connecting portion 24 are detachably connected.

In this embodiment, the first connecting portion 33 includes a connecting portion body 331 , a first latching position 332 disposed on the connecting portion body 331 , a guide rod 333 disposed on the connecting portion body 331 , and a guide rod 333 disposed on the connecting portion body 331 . The card hook 334. The second connecting portion 24 includes a first bayonet 241 penetrating the second top wall 22 , a second bayonet 242 penetrating the second top wall 22 and communicating with the first bayonet 241 , and a second bayonet 243 . The guide rod 333 extends from the side of the second top wall 22 away from the accommodating cavity 4 into the first bayonet 241 and is clamped into the second bayonet 242 , and the latching hook 334 is stuck in the second bayonet 243 close to the accommodating cavity 4 side, the first card position 332 is locked on the side of the second card position 243 away from the accommodating cavity 4, at this time, the first card position 332 and the hook 334 from the opposite sides of the second card position 243 to the second card position 243. The clamping position 243 is stuck, so that the first connecting portion 33 and the second connecting portion 24 are detachably connected.

In another embodiment, the outer side wall of the first connection part 33 is provided with an external thread, and the side wall of the second connection part 24 close to the first liquid taking through hole 23 is provided with an inner thread, so that the first connection part 33 and the second connection part 33 are provided with an inner thread. The connecting portion 24 is screwed.

Please refer to FIG. 8 and FIG. 9 , and in conjunction with FIG. 4 and FIG. 5 , the pressing portion 12 includes a third side wall 121 . One end of the third side wall 121 is connected to the first top wall 13 . The third side wall 121 surrounds and forms a second liquid taking through hole 122 , and the second liquid taking through hole 122 is coaxial with the first liquid taking through hole 23 . The diameter of the second liquid taking through hole 122 decreases in the direction away from the first liquid taking through hole 23 . The liquid taking tube 31 is used for extending into or out of the second liquid taking through hole 122 through the first liquid taking through hole 23 , and the third side wall 121 is used for abutting or loosening the side wall of the liquid taking tube 31 , so as to deform or restore the deformation of the liquid taking tube 31 to release the liquid or absorb the liquid.

In this embodiment, a pressing block 123 is provided on the surface of the third side wall 121 close to the second liquid-taking through hole 122 . The liquid taking tube 31 passes through the first liquid taking through hole 23 and the accommodating cavity 4 in sequence, and finally extends into the second liquid taking through hole 122 . The pressing block 123 abuts the side wall of the liquid taking tube 31 to The liquid taking tube 31 is deformed, and the air or liquid inside the liquid taking tube 31 is discharged. After the liquid taking tube 31 exits the second liquid taking through hole 122 in reverse, the liquid taking tube 31 restores its deformation to absorb the liquid.

In this embodiment, the number of the pressing blocks 123 is two, and the two pressing blocks 123 are respectively disposed on the opposite inner surfaces of the third side wall 121 . Squeeze the liquid taking tube 31 on both sides of the liquid taking tube 31, so that the liquid taking tube 31 can be deformed uniformly, and quantitative liquid taking can be realized by the deformation amount of the liquid taking tube 31, and the deformation amount of the liquid taking tube 31 can be obtained by two extrusion blocks 123. set the distance between them. It can be understood that the pressing block 123 can also be provided as an integral pressing block 123 , that is, a ring of pressing blocks 123 is provided on the third side wall 121 .

Please refer to FIG. 8 and FIG. 9 , the upper casing 1 further includes a fourth side wall 14 disposed at one end of the first side wall 11 away from the first top wall 13 and connecting the fourth side wall 14 and the first side wall 11 The platform part 15. The second side wall 21 of the lower case 2 is sleeved on the outer side of the first side wall 11 of the upper case 1 , and the end face of the second side wall 21 abuts the platform portion 15 . The shaft a acts as a limiter when reciprocating relative to the lower casing 2 .

Please refer to FIGS. 8 and 9 , the upper casing 1 further includes a positioning through hole 16 disposed on the first top wall 13 and a sliding groove 17 disposed on the outer surface of the first side wall 11 . The second side wall 21 of the lower housing 2 is provided with a guide bar 25 corresponding to the chute 17 , and the guide bar 25 can be snapped into the chute 17 . The second top wall 22 of the lower casing 2 is provided with a positioning rod 26 corresponding to the positioning through hole 16 . The positioning rod 26 can extend into the positioning through hole 16 and be clamped on the surface of the second top wall 22 . When the upper casing 1 reciprocates relative to the lower casing 2 , the guide bar 25 can move along the chute 17 , and the positioning rod 26 can move along the positioning through hole 16 , so that the upper casing 1 and the lower casing 2 will not be separated.

Please refer to FIG. 3 , FIG. 6 and FIG. 7 , the pressing mechanism 10 further includes an elastic member 5 . One end of the elastic member 5 abuts against the first top wall 13 , and the other end against the second top wall 22 . During the downward movement of the upper casing 1 relative to the lower casing 2, the elastic member 5 is compressed. When the upper casing 1 is released, the elastic member 5 recovers its deformation, and the deformation restoring force of the elastic member 5 drives the upper casing. Body 1 automatically returns. The elastic member 5 can be installed in the accommodating cavity 4 when the pressing mechanism 10 is assembled, and will not affect the later replacement of the liquid taking assembly 3 .

In this embodiment, the elastic member 5 may be a spring. In order to fix the elastic member 5 , the first top wall 13 is provided with a first positioning groove 18 , and the second top wall 22 is provided with a spring guide rod 27 . The spring guide rod 27 can extend into the first positioning groove 18 . One end of the elastic member 5 is sleeved on the spring guide rod 27 , and the other end extends into the first positioning groove 18 . The sum of the depth of the first positioning groove 18 and the height of the spring guide rod 27 is equal to the length of the elastic member 5 in its natural state. When the upper casing 1 drives the first positioning groove 18 to move toward the spring guide rod 27, the spring guide rod 27 extends into the first positioning groove 18, and the elastic member 5 is compressed, so that the first positioning groove 18 can limit the position of the part of the elastic member 5 that is not sleeved on the spring guide rod 27, so as to avoid compression of the elastic member 5. Offset occurs in the process.

In this embodiment, the number of elastic members 5 can be multiple, and the multiple elastic members 5 are arranged around the liquid sampling tube 31, which can balance the pressing force, so that the squeezing force received by the liquid sampling tube 31 is uniform, which is helpful for quantitative extraction. liquid.

In another embodiment, the first top wall 13 protrudes toward the side away from the accommodating cavity 4 to form a second positioning groove 19 , the pressing portion 12 penetrates the bottom of the second positioning groove 19 , and the elastic member 5 is sleeved It is located outside the pressing portion 12 and is embedded in the second positioning groove 19 , one end of which is pressed against the bottom surface of the second positioning groove 19 , and the other end is pressed against the second top wall 22 . When installing the liquid taking assembly 3 , the liquid taking tube 31 extends through the elastic member 5 through the first liquid taking through hole 23 and extends into the second liquid taking through hole 123 of the pressing part 12 . With this design, when the liquid taking assembly 3 is replaced, the elastic member 5 is not affected. It can be understood that, as shown in FIG. 7 , the elastic member 5 can also be arranged in the first positioning groove 18 and the second positioning groove 19 at the same time, so that when the upper casing 1 moves downward, the pressing part 12 is opposite to each other. The squeezing force of the liquid pipe 31 is more balanced, and the precision of liquid taking is improved.

Please refer to FIG. 12 , in conjunction with FIG. 4 and FIG. 5 , the liquid taking tube 31 is a hollow tubular structure with one end open and the cross-section is approximately a circle, the first connecting portion 33 is approximately a ring, the liquid taking head 32 is a hollow tubular structure with openings at both ends, one end of the first connecting portion 33 is connected with one end of this liquid taking head 32, and the other end is connected with the open end of this liquid taking pipe 31, so that this liquid taking pipe 31 is connected by the first connection The portion 33 communicates with the liquid sampling head 32 .

In this embodiment, the first connecting portion 33 and the liquid taking head 32 are integrally constructed, and the liquid taking pipe 31 is detachably mounted on the first connecting portion 33 , so that the liquid taking head 32 and the liquid taking pipe 31 are communicated. Specifically, the liquid taking assembly 3 can be molded together by an injection molding process. During the injection molding process, the cavity for forming the first connecting portion 33 and the liquid taking head 32 is communicated with the cavity for forming the liquid taking pipe 31, and injection molding can be performed at the same time. , shorten the molding cycle, improve the efficiency, and reduce the manufacturing cost of the liquid sampling assembly 3 at the same time. After molding, the open end of the liquid taking tube 31 is connected with the connecting part body 331 of the first connecting part 33 by a plastic strip, the plastic strip can be broken during use, and the liquid taking tube 31 is covered at the first connecting part 33. , and assembled to obtain the liquid taking assembly 3, which is ready for use.

In this embodiment, the liquid sampling tube 31 is made of rubber, and the outer diameter of the open end of the liquid sampling tube 31 can be designed to be slightly larger than the inner diameter of the first connecting portion 33, so that the two can be sealed through interference fit.

In this embodiment, the cross section of the liquid taking tube 31 along the center axis a perpendicular to the receiving cavity 4 gradually decreases from the end close to the liquid taking head 32 to the end far from the liquid taking head 32 , that is, the liquid taking tube 31 Roughly in the shape of an inverted cone.

Referring to FIGS. 1 to 3 , the liquid taking assembly 3 further includes a liquid taking head cover 34 , which is used to cover the end of the liquid taking head 32 away from the liquid taking pipe 31 to prevent the liquid taking head 32 from being polluted.

It can be understood that, in another embodiment, the liquid taking head (not shown) of the liquid taking assembly 3 can also be a tubular structure with one end open and the other end closed, and the open end of the liquid taking head and the first connecting part 33 is connected, and then communicated with the liquid taking pipe 31, when in use, the closed end of the liquid taking head is broken and inserted into the liquid to carry out liquid taking. Yes, to reduce costs.

Please refer to FIG. 4 , the liquid transfer device 100 further includes a pressing key 6 , the pressing key 6 is covered on the end of the fourth side wall 14 of the upper casing 1 away from the first side wall 11 , and is used for engaging with the upper casing 1 . , the purpose of moving the upper casing 1 relative to the lower casing 2 is achieved by pressing the pressing key 6 .

Please refer to FIG. 13 , in conjunction with FIG. 3 to FIG. 5 , the specific assembly process of the liquid transfer device 100 is as follows:

The first step is to assemble the pressing mechanism 10, first put the elastic member 5 into the lower casing 2, then snap the upper casing 1 and the lower casing 2 together to fix the elastic member 5, and then install the pressing key 6 on the upper casing 1.

The second step is to assemble the liquid taking assembly 3 , break the plastic strip between the liquid taking tube 31 and the first connecting portion 33 , and cover the liquid taking tube 31 at the first connecting portion 33 .

In the third step, the liquid taking assembly 3 is inserted into the accommodating cavity 4 of the pressing mechanism 10 through the first liquid taking through hole 23, and the first connecting portion 33 is engaged with the second connecting portion 24 of the lower casing 2, and the taking The liquid assembly 3 is fixed on the pressing mechanism 10 to complete the assembly.

In addition, when one liquid collection is completed, the liquid collection assembly 3 needs to be replaced. The liquid collection assembly 3 can be removed from the pressing mechanism 10 and replaced with a new liquid collection assembly 3. The installation method is the same as above.

Please refer to FIG. 4 and FIG. 5 again. When in use, press the push button 6 to push down the upper casing 1, so that the first side wall 11 moves down along the second side wall 21, and the pressing part 12 takes the liquid relatively The tube 31 moves downward, at this time, the elastic member 5 is compressed, the pressing block 123 presses the liquid taking tube 31, and the air inside the liquid taking tube 31 is discharged; insert one end of the liquid taking head 32 into the liquid, release the pressing button 6. The upper casing 1 is restored to its original position by the resilience of the elastic member 5, and the pressing block 123 moves upward relative to the liquid taking pipe 31 to loosen the liquid taking pipe 31, and the detection liquid will be sucked into the liquid taking pipe 31 to realize The purpose of quantitative extraction. Pressing the button 6 again can release the liquid in the liquid taking tube 31 .

Please refer to FIG. 4 and FIG. 5 . Specifically, the principle of the liquid transfer device 100 for quantitatively taking liquid is: the inner diameter d1 of the end of the tapered part of the liquid taking pipe 31 away from the liquid taking head 32 is small, which is called the small inner diameter end b. One end of the liquid head 32 has a larger inner diameter d2 and is referred to as a large inner diameter end c. As shown in FIG. 4 , when the liquid taking tube 31 is not compressed, its small inner diameter end b is located at the bottom of the two pressing blocks 123 , and the surfaces of the two pressing blocks 123 contact the top of the liquid taking tube 31 . As shown in FIG. 5 , when the upper casing 1 moves downward, the small inner diameter end b of the liquid taking tube 31 extends into the second liquid taking through hole 122 , and the liquid taking tube 31 extends between the two extrusion blocks 123 . The two squeezers 123 squeeze the side wall of the liquid taking tube 31, so that the liquid taking tube 31 is compressed, and the liquid taking tube 31 further extends into the second liquid taking through hole 122, until the two squeezing fasts 123 squeeze until the liquid taking tube 31 is squeezed. The large inner diameter end c of the liquid pipe 31 further discharges the fixed amount of air inside the liquid pipe 31 . After inserting the liquid-taking head 32 into the liquid, loosen the upper casing 1, the upper casing 1 is bounced back to its original position by the resilience of the elastic member 5, so that the liquid-taking tube 31 is withdrawn from between the two extrusion blocks 123, and the liquid is taken out. The deformation of the tube 31 is recovered to achieve the purpose of sucking liquid. By designing the values of d1 and d2 of the tapered structure of the liquid pipe 31, the distance between the two extrusion blocks 123, the contact area between the two extrusion blocks 123 and the liquid pipe 31, and the movement of the upper casing 1 relative to the lower casing 2 Stroke and other parameters, so as to achieve the purpose of quantitative liquid extraction.

The liquid transfer device 100 provided by the present invention can be used to transfer various liquid samples. For example, the liquid samples can include biological samples, patient samples, veterinary samples, or environmental samples.

In some embodiments, the liquid transfer device 100 provided by the present invention can be used to collect and dispense volumes between 1 μl and 5 ml (eg, 1 μl, 2 μl, 4 μl, 5 μl, 10 μl, 20 μl, 50 μl, 100 μl liters, 200 μl, 500 μl, 1 ml, 2 ml and 5 ml of any two numbers between the numbers).

Compared with the prior art, the liquid transfer device provided by the present invention has a simple structure and simple operation, can achieve quantitative liquid absorption, and can realize the transfer of a small amount of liquid; and the liquid sampling assembly and the pressing mechanism can be detachably arranged, and the pressing mechanism can be used multiple times. , The liquid collection component is a one-time consumable, which can be replaced at any time, saving costs.

Claims (10)

1. A liquid transfer device, comprising:

the pressing mechanism comprises an upper shell and a lower shell, the upper shell comprises a first side wall and a first top wall connected with the first side wall, an extrusion part is arranged on the first top wall, the lower shell comprises a second side wall and a second top wall, the second side wall is connected with the second top wall and is surrounded to form a containing cavity, and the upper shell is contained in the containing cavity; and

the liquid taking assembly comprises a liquid taking pipe, a liquid taking head and a first connecting part for communicating the liquid taking pipe with the liquid taking head, the liquid taking assembly is used for extending into the accommodating cavity from the second top wall so that the liquid taking pipe is arranged corresponding to the extruding part, the first connecting part is detachably arranged on the second top wall, and the liquid taking head is positioned outside the accommodating cavity,

the upper shell is used for reciprocating along a central shaft of the containing cavity, so that the extrusion part is driven to reciprocate relative to the liquid taking pipe, the extrusion part is made to abut against or release the liquid taking pipe, the liquid taking pipe is made to deform, and the liquid taking pipe releases or absorbs liquid.

2. The liquid transfer device of claim 1, wherein the lower housing further comprises a first liquid-taking through hole disposed on the second top wall, and a second connecting portion disposed on the second top wall and located around the first liquid-taking through hole, wherein the first connecting portion is detachably connected to the second connecting portion when the liquid-taking tube extends into the accommodating cavity through the first liquid-taking through hole.

3. The liquid transfer device of claim 2, wherein the first connection portion is a snap-fit connection or a threaded connection with the second connection portion.

4. The liquid transfer device of claim 3, wherein the first connection portion comprises a connection portion body, a first detent disposed on the connection portion body, a guide rod disposed on the connection portion body, and a detent disposed on the guide rod;

the second connecting part comprises a first bayonet penetrating through the second top wall, a second bayonet penetrating through the second top wall and communicated with the first bayonet and a second clamping position,

the guide rod is inserted into the first bayonet and clamped into the second bayonet through the second top wall, the hook is clamped at one side of the accommodating cavity, the second clamping position is close to one side of the accommodating cavity, the first clamping position is clamped at one side of the accommodating cavity, and the first connecting portion and the second connecting portion are detachably connected.

5. The liquid transfer device according to claim 2, wherein the pressing portion comprises a third side wall, one end of the third side wall is connected with the first top wall, a second liquid taking through hole is formed by the third side wall in a surrounding manner, and the second liquid taking through hole is communicated with the first liquid taking through hole and is coaxial with the accommodating cavity;

the aperture of the second liquid taking through hole decreases progressively along the direction far away from the second liquid taking through hole, the liquid taking pipe is used for extending into or withdrawing from the second liquid taking through hole, and the third side wall is used for abutting against or loosening the liquid taking pipe.

6. The liquid transfer device of claim 5, wherein an inner diameter of the liquid taking tube in a direction perpendicular to the central axis of the accommodating chamber decreases from an end close to the liquid taking head to an end far from the liquid taking head.

7. The liquid transfer device of claim 5, wherein the inner surface of the third sidewall is provided with a squeezing block for abutting against or releasing the liquid take-off tube.

8. The liquid transfer device of claim 2, wherein the pressing mechanism further comprises an elastic member received in the receiving cavity, one end of the elastic member abuts against the first top wall, the other end abuts against the second top wall, and an elastic restoring force of the elastic member is used for moving the upper housing away from the lower housing.

9. The liquid transfer device of claim 8, wherein the resilient member is a plurality of resilient members disposed about the liquid take-off tube; or

The elastic piece is sleeved on the outer side of the extrusion part.

10. The liquid transfer device of claim 1, further comprising a push key disposed at an end of the upper housing distal from the lower housing.

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