Pipettor

Abstract

The utility model belongs to the technical field of medical detection, and relates to a pipettor which comprises a shell, an end cover, a pipetting assembly, a driving mechanism and a control assembly, the end cover is arranged on the side, close to the pipetting end, of the shell, the end cover comprises at least one sealing component, a circular through hole is formed in the end cover, the sealing component is arranged in the circular through hole, a guide hole is formed in the sealing component, and the circular through hole and the guide hole are coaxially arranged; the pipetting assembly is arranged on the side, close to the pipetting section, of the shell, at least part of the pipetting assembly penetrates through the guide hole and extends out of the other side of the end cover, and the guide hole and the pipetting assembly are coaxially arranged; the control assembly is electrically connected with the driving mechanism. According to the technical scheme provided by the invention, the assembly precision of the pipettor can be improved, so that the liquid adding precision of the pipettor is improved.

Description

Technical Field

[0001] The present application relates to the field of medical detection technology, and more specifically, to a pipette. Background Art

[0002] Micro-pipetting is often required in application fields such as biology, chemistry, environment, pharmaceutical research and development, and food. A pipette is an instrument used to quantify professional liquids, usually in conjunction with a three-dimensional moving mechanism to achieve quantitative absorption and transfer of liquids.

[0003] The driving components of the commonly used pipettes are all exposed to the outside (such as patent CN213222237U). The external environment will affect them during use, resulting in poor discharge accuracy of the pipette. In addition, the internal components of the existing pipettes are unconstrained, and errors are easily generated during use, which affects the discharge accuracy. Utility Model Content

[0004] The technical problem to be solved by the embodiments of the present application is that the existing pipette has poor liquid adding accuracy.

[0005] In order to solve the above technical problems, the present application provides a pipette, which adopts the following technical solution:

[0006] A pipette comprises a housing, an end cover, a pipetting assembly, and a driving mechanism and a control assembly installed in the housing;

[0007] The end cover is installed on the side of the housing close to the pipetting end, the end cover includes at least one sealing member, the end cover is provided with a circular through hole, the sealing member is installed in the circular through hole, the sealing member is provided with a guide hole, and the circular through hole is coaxially arranged with the guide hole;

[0008] The pipetting assembly is installed on one side of the housing close to the pipetting section, and at least part of the pipetting assembly extends through the guide hole to the other side of the end cover, and the guide hole is coaxially arranged with the pipetting assembly;

[0009] The control assembly is electrically connected to the drive mechanism. Further, the end cover comprises at least two sealing components, a plurality of the sealing components are arranged in parallel in the circular through hole, and the guide holes of the plurality of the sealing components are coaxially arranged.

[0010] Furthermore, the sealing component is a pan-plug seal.

[0011] Furthermore, the liquid transfer assembly includes a piston cylinder and a liquid collecting head, one end of the piston cylinder is connected to the circular through hole, and the other end is connected to the liquid collecting head;

[0012] The driving mechanism comprises a driving assembly and a piston rod, one end of the piston rod is connected to the output end of the driving assembly, and the other end of the piston rod passes through the guide hole and is placed into the inner cavity of the piston cylinder.

[0013] Furthermore, the end cover and the piston rod are made of insulating material;

[0014] The pipetting assembly further comprises an electrical connector, and the piston cylinder is electrically connected to the control assembly via the electrical connector.

[0015] Furthermore, the driving assembly includes a driving member, a fixing member and a coupling. The driving member is fixedly mounted in the housing through the fixing member, and the coupling is connected between an output end of the driving member and an input end of the transmission assembly.

[0016] Furthermore, the driving mechanism further comprises a transmission assembly, which is transmission-connected between the driving assembly and the piston rod;

[0017] The driving assembly drives the transmission assembly to move, and drives the piston rod to move in the piston cylinder, so that the liquid collection head can absorb or discharge liquid.

[0018] Furthermore, the driving assembly includes a driving member, a fixing member and a coupling. The driving member is fixedly mounted in the housing through the fixing member, and the coupling is connected between an output end of the driving member and an input end of the transmission assembly.

[0019] Furthermore, the transmission assembly includes a screw, a screw nut, a slider and at least two screw fixing brackets;

[0020] The plurality of screw rod fixing frames are fixedly installed in the housing; the screw rod passes through the plurality of screw rod fixing frames and is installed in the housing; the screw rod nut is sleeved on the screw rod, one end of the slider is connected to the nut, and the other end is connected to the pipetting component.

[0021] Furthermore, the control component includes a main control circuit board, and the main control circuit board is electrically connected to the driving mechanism.

[0022] Furthermore, the control component further comprises a temperature sensor, and the temperature sensor is electrically connected to the main control circuit board; and / or

[0023] The control component further comprises a humidity sensor, and the humidity sensor is electrically connected to the main control circuit board; and / or

[0024] The control component also includes an air pressure detection circuit board. The end cover is provided with a connecting air channel, which is connected between the circular through hole and the detection end of the air pressure detection circuit board. The air pressure detection circuit board is electrically connected to the main control circuit board.

[0025] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0026] The pipette provided in the present application installs the driving mechanism and the control component in the shell to prevent the pipette from being disturbed by the outside world during use, thereby improving the discharge accuracy of the pipette; at the same time, a sealing component with a guide hole is installed in the circular through hole of the end cover, and at least part of the pipette component extends through the guide hole to the other side of the end cover, thereby improving the sealing degree in the shell and reducing the influence of temperature and humidity on the discharge accuracy; in addition, the pipette component in the pipette is guided by the guide hole on the sealing component, thereby improving the movement accuracy of the pipette component when in use, reducing wear, and improving the service life of the pipette and the liquid addition accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the scheme of the present application, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 is a schematic structural diagram of a pipette according to an embodiment of the present application;

[0029] Figure 2 is a cross-sectional schematic diagram of a pipette according to an embodiment of the present application;

[0030] Figure 3 About Figure 2 A schematic diagram of the structure enlargement at A;

[0031] Figure 4 It is a cross-sectional schematic diagram of the pipetting mechanism of an embodiment of the present application (without the piston rod).

[0032] Reference numerals:

[0033] 1. Shell; 2. End cover; 21. Sealing member; 22. Circular through hole; 23. Airway connection; 3. Liquid transfer assembly; 31. Piston cylinder; 32. Liquid collection head; 33. Electrical connector; 4. Driving mechanism; 41. Driving assembly; 411. Driving member; 412. Fixing member; 413. Coupling; 42. Transmission assembly; 421. Screw fixing bracket; 422. Screw; 423. Screw nut; 424. Slider; 43. Piston rod; 5. Control assembly; 51. Main control circuit board; 52. Air pressure detection circuit board. DETAILED DESCRIPTION

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0035] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0036] See also Figure 1 to Figure 4 As shown, an embodiment of the present application provides a pipette, comprising: a housing 1, an end cover 2, a pipetting assembly 3, and a driving mechanism 4 and a control assembly 5 installed in the housing 1.

[0037] In some embodiments, the end cap 2 is installed on the side of the shell 1 close to the pipetting end, and the end cap 2 includes at least one sealing component 21. A circular through hole 22 is provided on the end cap 2. The sealing component 21 is installed in the circular through hole 22. A guide hole (not shown in the figure) is provided on the sealing component 21. In the present embodiment, the circular through hole 22 is coaxially arranged with the guide hole.

[0038] In some embodiments, the pipetting component 3 is installed on the side of the shell 1 close to the pipetting section, and at least part of the pipetting component 3 extends through the guide hole to the other side of the end cover, and the guide hole is coaxially arranged with the pipetting component 3. In this embodiment, the pipetting component 3 includes a piston cylinder 31 and a liquid collection head 32, one end of the piston cylinder 31 is connected to the circular through hole 22, and the other end is connected to the liquid collection head 32, and the piston cylinder 31 is coaxially arranged with the guide hole.

[0039] The pipette provided in the present application installs the driving mechanism 4 and the control component 5 in the shell 1 to prevent the pipette from being disturbed by the outside world during use, thereby improving the liquid adding accuracy of the pipette; at the same time, a sealing component 21 with a guide hole is installed in the circular through hole 22 of the end cover 2, and at least part of the pipette component 3 extends through the guide hole to the other side of the end cover 2, thereby improving the sealing degree in the shell 1 and reducing the influence of temperature and humidity on the liquid adding accuracy; in addition, the pipette component 3 in the pipette is guided by the guide hole on the sealing component 21, thereby improving the movement accuracy of the pipette component 3 when in use, reducing wear, and improving the service life and liquid adding accuracy of the pipette.

[0040] See also Figure 3 As shown, in some embodiments, the end cover 2 includes at least two sealing components 21, a plurality of the sealing components 21 are arranged in parallel in the circular through hole 22, and the guide holes of the plurality of the sealing components 21 are coaxially arranged.

[0041] In this embodiment, the sealing member 21 is a flood seal.

[0042] The embodiment of the present application achieves the effect of further improving the liquid filling accuracy of the pipette by sequentially stacking a plurality of pan-plug seals in the circular through hole 22 and guiding the moving trajectory of the pipette component 3 through the guide holes of the plurality of pan-plug seals; in addition, the provision of the plurality of pan-plug seals can further improve the sealing performance in the shell 1, prevent the influence of temperature and humidity on the driving mechanism 4 inside the shell 1, and improve the use stability, service life and liquid filling stability of the pipette.

[0043] See also Figure 2 , Figure 3 As shown, in the present embodiment, a thread groove is formed at one end of the circular through hole 22 connected to the piston cylinder 31, and an external thread matching the thread groove is provided at the end of the piston cylinder 31, and the piston cylinder 31 is fixedly mounted on the circular through hole 22 by the cooperation of the external thread and the thread groove, and the end of the piston cylinder 31 away from the circular through hole 22 is connected to the liquid collecting head 32, and the liquid collecting head 32 is mounted on the piston cylinder 31, and a liquid collecting pipeline is provided in the liquid collecting head 32, and the liquid collecting pipeline is connected to the inner cavity of the piston cylinder 31.

[0044] In some embodiments, the driving mechanism 4 includes a driving component 41 and a piston rod 43 , one end of the piston rod 43 is connected to the output end of the driving component 41 , and the other end passes through the guide hole and is inserted into the inner cavity of the piston cylinder 31 .

[0045] In this embodiment, the driving assembly 41 drives the piston rod 43 along the guide hole to approach the piston cylinder 31 or move away from the piston cylinder 31, so that the liquid enters the inner cavity of the piston cylinder 31 through the liquid collection pipeline of the liquid collection head 32 or is discharged from the inner cavity of the piston cylinder 31 through the liquid collection pipeline of the liquid collection head 32, thereby realizing liquid collection and liquid addition of the pipette.

[0046] See also Figure 1 , Figure 2 As shown, in some embodiments, the pipetting component 3 also includes an electrical connector 33, and the piston cylinder 31 is electrically connected to the control component 5 through the electrical connector 33; when the liquid collecting head 32 contacts the liquid surface, a loop is formed through the liquid collecting head 32, the piston cylinder 31, the electrical connector 33 and the control component 5, so that the pipette has the function of capacitive liquid level detection.

[0047] In this embodiment, the end cover 2 and the piston rod 43 are made of insulating material.

[0048] The end cap 2 and the piston rod 43 of the embodiment of the present application are made of insulating material, which reduces the interference degree of the capacitive detection of the liquid level of the pipette.

[0049] See also Figure 4 As shown, in some embodiments, a connecting air channel 23 is further provided on the end cover 2, and the connecting air channel 23 is connected between the circular through hole 22 and the control component 5. When the driving component 41 drives the piston rod 43 to move along the guide hole in the inner cavity of the piston cylinder 31, the control component 5 detects the air pressure change in the piston cylinder 31 through the connecting air channel 23, thereby determining whether the pipette is taking liquid, so that the pipette has the function of detecting the liquid level with air pressure.

[0050] The pipette provided in the embodiment of the present application can have the liquid level detection functions of capacitance detection of liquid level and air pressure detection of liquid level, thereby improving the adaptability of the pipette to different usage scenarios and improving the adaptability of the pipette to different liquids.

[0051] Please continue reading Figure 2 As shown, in some embodiments, the driving component 41 includes a driving member 411, a fixing member 412 and a coupling 413. The driving member 411 is fixedly mounted in the housing 1 through the fixing member 412. The coupling 413 is connected between the output end of the driving member 411 and the input end of the piston rod 43. In this embodiment, the driving member 411 is a servo motor.

[0052] In the embodiment of the present application, the fixing member 412 is provided to fix the driving member 411 to improve the assembly accuracy of the driving member 411. At the same time, the fixing member 412 can reduce the vibration generated when the driving member 411 is started, thereby avoiding affecting the liquid adding accuracy of the pipette during use.

[0053] See also Figure 2 As shown, in some embodiments, the driving mechanism 2 further includes a transmission assembly 42, and the transmission assembly 42 is transmission-connected between the driving assembly 41 and the piston rod 43;

[0054] The driving assembly 41 drives the transmission assembly 42 to move, and drives the piston rod 43 to move, so that the liquid taking head 32 takes liquid or adds liquid.

[0055] In this embodiment, the driving component 41 drives the piston rod 43 along the guide hole to approach the piston cylinder 31 or move away from the piston cylinder 31 through the transmission component 42, so that the liquid enters the inner cavity of the piston cylinder 31 through the liquid collection pipeline of the liquid collection head 32 or is discharged from the inner cavity of the piston cylinder 31 through the liquid collection pipeline of the liquid collection head 32, thereby realizing liquid collection and liquid addition of the pipette.

[0056] Please continue reading Figure 2 As shown, in some embodiments, the transmission assembly 42 includes a screw 422, a screw nut 423, a slider 424 and at least two screw fixing brackets 421;

[0057] The plurality of screw rod fixing frames 421 are fixedly installed in the housing 1; the screw rod 422 passes through the plurality of screw rod fixing frames 421 and is installed in the housing 1; the screw rod nut 423 is sleeved on the screw rod 422, one end of the slider 424 is connected to the screw rod nut 423, and the other end is connected to the piston rod 43.

[0058] In this embodiment, there are two screw fixing frames 421, which are symmetrically arranged at both ends of the housing 1. A bearing (not shown in the figure) is provided on the screw fixing frames 421, one end of the screw 422 is connected to the bearing, and the other end passes through the bearing and is connected to the output end of the driving member 411; the screw nut 423 is sleeved on the screw 222, one end of the slider 424 is connected to the screw nut 423, and the other end is connected to the end of the piston rod 43.

[0059] In the embodiment of the present application, the screw rod 422 is fixed by the screw rod fixing frames 421 arranged at both ends of the housing 1 and the screw rod 422 is restricted from shaking during the rotation process, thereby avoiding affecting the liquid adding accuracy of the pipette during use.

[0060] In some embodiments, the control component 5 includes a main control circuit board 51 , and the main control circuit board 51 is electrically connected to the driving mechanism 4 . In this embodiment, the main control circuit board is electrically connected to the driving member 411 .

[0061] In this embodiment, the control component 5 also includes a temperature sensor (not shown in the figure), which is electrically connected to the main control circuit board 51. The control component 5 controls the output power of the driving member 411 according to the temperature change in the shell 1 detected by the temperature sensor to maintain the liquid collection stability of the pipette.

[0062] In this embodiment, the control component 5 also includes a humidity sensor (not shown in the figure), which is electrically connected to the main control circuit board 51. The control component 5 controls the output power of the driving member 411 according to the humidity change in the shell 1 detected by the humidity sensor to maintain the liquid collection stability of the pipette.

[0063] In this embodiment, the control component 5 also includes an air pressure detection circuit board 52, the connecting air channel 23 is connected between the circular through hole 22 and the detection end of the air pressure detection circuit board 52, and the air pressure detection circuit board 52 is electrically connected to the main control circuit board 51.

[0064] Obviously, the embodiments described above are only some embodiments of the present application, rather than all embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to perform equivalent replacement of some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of this application, directly or indirectly used in other related technical fields, is similarly within the scope of patent protection of this application.

Claims

1. A pipette, characterized in that: It includes a housing, an end cover, a liquid transfer assembly, and a driving mechanism and a control assembly installed in the housing; The end cover is installed on the side of the housing close to the pipetting end, the end cover includes at least one sealing member, the end cover is provided with a circular through hole, the sealing member is installed in the circular through hole, the sealing member is provided with a guide hole, and the circular through hole is coaxially arranged with the guide hole; The pipetting assembly is installed on one side of the housing close to the pipetting section, and at least part of the pipetting assembly extends through the guide hole to the other side of the end cover, and the guide hole is coaxially arranged with the pipetting assembly; The control component is electrically connected to the driving mechanism.

2. The pipette according to claim 1, characterized in that The end cover comprises at least two sealing components, a plurality of the sealing components are arranged in parallel in the circular through hole, and the guide holes of the plurality of the sealing components are coaxially arranged.

3. The pipette according to claim 2, characterized in that The sealing member is a flood seal.

4. The pipette according to claim 1, characterized in that The liquid transfer assembly comprises a piston cylinder and a liquid collecting head, one end of the piston cylinder is connected to the circular through hole, and the other end is connected to the liquid collecting head; The driving mechanism comprises a driving assembly and a piston rod, one end of the piston rod is connected to the output end of the driving assembly, and the other end of the piston rod passes through the guide hole and is placed into the inner cavity of the piston cylinder.

5. The pipette according to claim 4, characterized in that The end cover and the piston rod are made of insulating material; The pipetting assembly further comprises an electrical connector, and the piston cylinder is electrically connected to the control assembly via the electrical connector.

6. The pipette according to claim 4, characterized in that The driving mechanism further comprises a transmission assembly, which is transmission-connected between the driving assembly and the piston rod; The driving assembly drives the transmission assembly to move, and drives the piston rod to move in the piston cylinder, so that the liquid collection head can absorb or discharge liquid.

7. The pipette according to claim 6, characterized in that The transmission assembly includes a screw, a screw nut, a slider and at least two screw fixing brackets; The plurality of screw rod fixing frames are fixedly installed in the housing; the screw rod passes through the plurality of screw rod fixing frames and is installed in the housing; the screw rod nut is sleeved on the screw rod, one end of the slider is connected to the screw rod nut, and the other end is connected to the pipetting component.

8. The pipette according to claim 6, characterized in that The driving assembly comprises a driving member, a fixing member and a coupling. The driving member is fixedly mounted in the housing through the fixing member, and the coupling is connected between the output end of the driving member and the input end of the transmission assembly.

9. The pipette according to claim 1, characterized in that The control component includes a main control circuit board, and the main control circuit board is electrically connected to the driving mechanism.

10. The pipette according to claim 9, characterized in that The control assembly further comprises a temperature sensor, wherein the temperature sensor is electrically connected to the main control circuit board; and / or The control assembly further comprises a humidity sensor, wherein the humidity sensor is electrically connected to the main control circuit board; and / or The control component also includes an air pressure detection circuit board. The end cover is provided with a connecting air channel, which is connected between the circular through hole and the detection end of the air pressure detection circuit board. The air pressure detection circuit board is electrically connected to the main control circuit board.

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