A pipetting section for a multichannel pipettor

Abstract

The utility model relates to pipette technical field relates to a pipette part for multichannel pipette, including casing, push rod module and suction head module, the casing is hollow structure, and the lower meshing tooth is equipped with in the upper end outside wall, the push rod shell of push rod module contains the coaxial link of upper mounting section and lower mounting section, is equipped with the inner thread connection part in the upper mounting section, and the outside is equipped with the upper meshing tooth, the lower mounting section is passed and is equipped with spring no.

Description

Technical Field

[0001] This utility model relates to the field of pipette technology, and specifically to a pipetting section for a multichannel pipette. Background Technology

[0002] In scientific research and medical testing scenarios such as biological experiments and chemical analysis, multichannel pipettes have become commonly used laboratory equipment due to their ability to achieve simultaneous multichannel pipetting, significantly improving pipetting efficiency. The lower part (pipette section) of the multichannel pipette, as the core component that directly supports the pipette tip and performs aspiration and dispensing actions, has a structural design that directly affects the ease of use, maintenance efficiency, and applicability of the equipment.

[0003] The lower half of existing multichannel pipettes suffers from the following significant drawbacks: Traditional multichannel pipettes often have a fixed connection between the lower and upper halves, or only allow for small-angle rotation, failing to provide 360° omnidirectional rotation to suit experimental needs. When faced with reagent containers in different orientations, multi-station experimental platforms, or complex layouts, operators must frequently adjust hand positions or move reagent containers, increasing operational difficulty and increasing the risk of spillage due to improper handling, thus affecting experimental safety and accuracy. This makes them unsuitable for diverse pipetting requirements. Utility Model Content

[0004] This invention addresses the problems of the prior art by providing a pipetting section for a multichannel pipette.

[0005] The objective of this utility model can be achieved through the following technical solution: A pipetting part for a multi-channel pipette includes a housing, a push rod module, and a pipette tip module. The housing has a hollow structure, with a lower meshing tooth integrally formed on the upper outer wall. The push rod module includes a push rod housing and a push rod assembly slidably assembled within the push rod housing. The push rod housing includes an upper mounting section and a lower mounting section coaxially connected. The upper mounting section has an internally threaded connection at its upper end and an upper meshing tooth integrally formed on its lower outer wall. The upper meshing tooth can mesh with the lower meshing tooth. The lower mounting section slides through the housing and has an annular positioning ring fixed at its end. A spring is sleeved on the outer side of the lower mounting section, and the two ends of the spring elastically abut against the lower end face of the upper mounting section and the upper end face of the housing, respectively. The pipette tip module is assembled inside the housing, with its upper end fixed to the lower end of the push rod assembly, for the purpose of liquid aspiration and dispensing.

[0006] In a further improvement, a positioning mechanism is fixed inside the housing. The positioning mechanism includes multiple sets of horizontally arranged partition plates and a top cover plate. The partition plates are spaced apart along the width of the housing to separate multiple suction head modules. The top cover plate has an L-shaped cross-section, with its horizontal section abutting the top of the partition plate and its vertical section having multiple sets of positioning holes for guiding and positioning the suction head modules.

[0007] Further improvements include an ejection module, which includes a pusher ring and a T-shaped pusher rod. The pusher ring is slidably sleeved on the outside of the upper mounting section, and a connecting plate is integrally formed on its side end. The end of the T-shaped pusher rod near the pusher ring is connected to the connecting plate by a buckle, and an ejection plate is fixed on the end away from the pusher ring. Multiple sets of arc-shaped ejection grooves are formed through the lower end of the ejection plate. The arc-shaped ejection grooves correspond one-to-one with the suction head module and are sleeved on the outside of the suction head module.

[0008] In a further improvement, the horizontal section of the T-shaped push rod has an oblong hole, a guide rod is fixed inside the housing and a second spring is assembled on its side. The guide rod slides through the oblong hole to guide and limit the T-shaped push rod. The second spring is horizontally arranged, with one end elastically abutting against the side end of the guide rod and the other end elastically abutting against the inner wall of the T-shaped push rod, for resetting the ejection module.

[0009] In a further improvement, the push rod assembly includes a connecting cavity, a push rod, and a spring. The side end of the connecting cavity is threadedly engaged with the internal threaded connection part of the upper mounting section. The push rod includes an upper push rod and a lower push rod. The upper push rod is slidably assembled in the connecting cavity, and the lower push rod is correspondingly disposed inside the housing and coaxially connected with the upper push rod. The spring is sleeved on the outside of the upper push rod. A limiting seat is fixedly provided at the end of the upper push rod away from the lower push rod. The two ends of the spring are elastically abutted against the side end of the limiting seat and the inner wall of the upper mounting section, respectively. Multiple sets of mounting grooves are opened at the end of the lower push rod away from the upper push rod. The upper end of the suction head module is embedded in the mounting groove and fixed.

[0010] In a further improvement, the suction head module includes a piston rod and a capacity rod. One end of the piston rod is fixedly connected to the lower push rod of the push rod module, and the other end slides through the inside of the capacity rod. A piston ring is fixedly provided at the end of the piston rod located inside the capacity rod. The piston ring is sealed and fitted to the inner wall of the capacity rod. The lower end of the capacity rod is inserted into the positioning hole and slides in fit. A spring four is sleeved on the outer side. An annular protrusion is integrally formed on the outer side of the capacity rod. One end of the spring four abuts against the annular protrusion, and the other end elastically abuts against the inner wall of the upper cover plate.

[0011] In a further improvement, the end of the volume rod away from the piston rod is provided with a pipette tip connection end, and a sealing ring is embedded in the outer wall of the pipette tip connection end to improve the sealing performance with the pipette tip.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. During the use of this utility model, because the upper and lower meshing teeth are in a separated state, the housing can drive the pipette tip module to rotate 360° relative to the push rod module, which can flexibly adapt to the needs of pipetting operations at different angles and directions, making the operation more flexible; when disassembling and maintaining, simply press the upper mounting section of the push rod housing to compress the spring, so that the upper meshing teeth move down with the upper mounting section and mesh with the lower meshing teeth. At this time, the housing and the push rod housing are relatively fixed, and the whole can be disassembled from the upper half of the pipette, which is convenient for subsequent replacement, maintenance and disinfection operations. The structure is simple and the operation is convenient. 2. This utility model uses partition plates spaced along the width of the shell to form independent partition spaces for multiple pipette tip modules, avoiding mutual interference between modules during the pipetting process and ensuring the synchronization and stability of multi-channel pipetting; the positioning holes of the L-shaped top cover plate provide guidance and positioning for the pipette tip modules, ensuring the coaxiality of the piston rod and the volume rod, reducing sealing fit deviation, reducing the risk of leakage, and the structure is simple and easy to disassemble and assemble. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a partial structural diagram of the push rod module of this utility model; Figure 4 This is a partial structural schematic diagram of the present invention; Figure 5 This is a schematic diagram of the structure of the housing and the ejection module of this utility model; Figure 6 This is a schematic diagram of the internal structure of the shell of this utility model.

[0014] In the diagram, 1. Housing; 11. Lower meshing tooth; 12. Positioning mechanism; 121. Partition plate; 122. Upper cover plate; 1221. Positioning hole; 13. Guide rod; 14. Spring II; 2. Push rod module; 21. Push rod housing; 211. Upper mounting section; 2111. Internal threaded connection; 2112. Upper meshing tooth; 212. Lower mounting section; 2121. Annular positioning ring; 213. Spring I; 22. Push rod assembly; 221. Connecting cavity; 222, Push rod; 2221, Upper push rod; 22211, Limit seat; 2222, Lower push rod; 22221, Mounting groove; 223, Spring three; 3, Suction head module; 31, Piston rod; 311, Piston ring; 32, Capacity rod; 321, Sealing ring; 33, Spring four; 4, Unloading module; 41, Push ring; 411, Connecting plate; 42, T-shaped push rod; 421, Unloading plate; 422, Arc-shaped unloading groove; 423, Waist-shaped hole. Detailed Implementation

[0015] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0016] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0017] The following is a description of the embodiments and appendices. Figures 1-6 The technical solution of this utility model will be further described below. Example 1

[0018] A pipetting section for a multichannel pipette includes a housing 1, a push rod module 2, and a pipette tip module 3. The housing 1 has a hollow structure, with a lower meshing tooth 11 integrally formed on the upper outer side wall. The push rod module 2 includes a push rod housing 21 and a push rod assembly 22 slidably assembled within the push rod housing 21. The push rod housing 21 includes an upper mounting section 211 and a lower mounting section 212 coaxially connected. The upper mounting section 211 has an internally threaded connection 2111 inside its upper end and a lower outer side wall integrally formed with a lower meshing tooth 11. The upper meshing tooth 2112 can mesh with the lower meshing tooth 11. The lower mounting section 212 slides through the inside of the housing 1 and has an annular positioning ring 2121 fixed at its end. A spring 213 is sleeved on the outside of the lower mounting section 212. The two ends of the spring 213 elastically abut against the lower end face of the upper mounting section 211 and the upper end face of the housing 1, respectively. The suction head module 3 is assembled inside the housing 1 and its upper end is fixed to the lower end of the push rod assembly 22 for the purpose of liquid suction and discharge.

[0019] like Figures 1-6 As shown, the specific structure of this utility model is as follows: The interior of the housing 1 forms an installation cavity to accommodate the lower part of the push rod module 2 and the suction head module 3. The upper outer wall of the housing 1 is integrally formed with a lower meshing tooth 11 along the circumferential direction. The lower meshing tooth 11 is a ring-shaped serrated structure used to achieve detachable meshing and positioning with the push rod module 2. The push rod module 2 includes a push rod housing 21 and a push rod assembly 22 slidably fitted within the push rod housing 21, wherein: The push rod housing 21 is generally stepped shaft-shaped, including an upper mounting section 211 and a lower mounting section 212 that are coaxially connected. The outer diameter of the upper mounting section 211 is larger than the outer diameter of the lower mounting section 212, thereby forming an annular stepped surface at the connection. The upper mounting section 211 has an internal threaded connection part 2111 inside, which is used to fix the output end of the upper half of the multi-channel pipette with threads. The lower outer wall of the upper mounting section 211 has an upper meshing tooth 2112 integrally formed along the circumference. The tooth shape and number of teeth of the upper meshing tooth 2112 are adapted to the lower meshing tooth 11, and can selectively mesh or separate from the lower meshing tooth 11. The lower mounting section 212 slides through the hollow interior of the housing 1 along the axial direction, and an annular positioning ring 2121 is coaxially fixed at its end. The outer diameter of the annular positioning ring 2121 is larger than the inner diameter of the housing 1, which plays an axial limiting role. A spring 213 is sleeved on the outer side of the lower mounting section 212. The upper end of the spring 213 elastically abuts against the annular step surface at the lower end of the upper mounting section 211, and the lower end elastically abuts against the upper end surface of the housing 1. Under normal conditions, the spring 213 is in a naturally extended state, pushing the upper meshing tooth 2112 to separate from the lower meshing tooth 11.

[0020] The working principle of this utility model is as follows: First, insert the suction tip module 3 into the mounting cavity of the housing 1 and fix it in place. Then, insert the lower mounting section 212 of the push rod module 2 into the housing 1. At this time, the spring 213 is in a naturally extended state, which drives the upper meshing tooth 2112 to completely separate from the lower meshing tooth 11 of the housing 1. Through the internal thread connection part 2111 of the upper mounting section 211, the push rod housing 21 can be quickly fixed to the upper half of the pipette. No complicated tools are required throughout the process, and the assembly steps are simple and efficient. During use, because the upper and lower meshing teeth are in a separated state, the housing 1 can drive the pipette tip module 3 to rotate 360° relative to the push rod module 2, which can flexibly adapt to the needs of pipetting operations at different angles and positions, making the operation more flexible. When disassembling and maintaining, simply press the upper mounting section 211 of the push rod housing 21 to compress the spring 213, so that the upper meshing tooth 2112 moves down with the upper mounting section 211 and meshes with the lower meshing tooth 11. At this time, the housing 1 and the push rod housing 21 are relatively fixed, and the whole can be disassembled from the upper half of the pipette, which is convenient for subsequent replacement, maintenance and disinfection operations. The structure is simple and the operation is convenient.

[0021] As a further preferred embodiment, a positioning mechanism 12 is fixedly provided inside the housing 1. The positioning mechanism 12 includes multiple sets of horizontally arranged partition plates 121 and an upper cover plate 122. The partition plates 121 are spaced apart along the width direction of the housing 1 to separate multiple sets of suction head modules 3. The upper cover plate 122 has an L-shaped cross section, with its horizontal section abutting against the top of the partition plate 121 and its vertical section having multiple sets of positioning holes 1221 for guiding and positioning the suction head modules 3.

[0022] Specifically, multiple sets of partition plates 121 divide the mounting cavity inside the housing into independent module mounting cavities. The two ends of the L-shaped upper cover plate 122 are fixed inside the housing 1 with bolts, so that its horizontal section is tightly abutted against the top of the partition plate 121 and its vertical section is fixed against the inner side wall of the housing 1, ensuring that the positioning holes 1221 of the upper cover plate 122 are neatly arranged along the length of the housing 1. During the installation process, each set of suction head modules 3 is placed into the independent cavity formed by the partition plate 121, so that the lower end of the capacity rod 32 of the suction head module 3 is aligned with the positioning hole 1221 of the upper cover plate 122 and inserted. The positioning hole 1221 forms a guide limit for the capacity rod 32, ensuring that the suction head module 3 maintains coaxiality after installation and avoids displacement. Next, the lower mounting section 212 of the push rod module 2 is inserted into the housing 1, so that the lower push rod 2222 of the push rod assembly 22 is connected and fixed with the piston rod 31 of the suction head module 3.

[0023] The partition plates 121 are spaced apart along the width of the housing 1, which can form independent partition spaces for multiple pipette tip modules 3, avoiding mutual interference between modules during the liquid transfer process and ensuring the synchronization and stability of multi-channel liquid transfer; the positioning holes 1221 of the L-shaped upper cover plate 122 provide guidance and positioning for the pipette tip module 3, ensuring the coaxiality of the piston rod 31 and the capacity rod 32, reducing sealing fit deviation, reducing the risk of leakage, and the structure is simple and easy to disassemble and assemble.

[0024] As a further preferred embodiment, it also includes a material ejection module 4, which includes a pusher ring 41 and a T-shaped pusher rod 42. The pusher ring 41 is slidably sleeved on the outside of the upper mounting section 211, and a connecting plate 411 is integrally formed on its side end. The end of the T-shaped pusher rod 42 near the pusher ring 41 is connected to the connecting plate 411 by a buckle, and the end away from the pusher ring 41 is fixed with an ejection plate 421. The lower end of the ejection plate 421 is provided with multiple sets of arc-shaped ejection grooves 422, which correspond one-to-one with the suction head module 3 and are sleeved on the outside of the suction head module 3.

[0025] Specifically, the pusher ring 41 cooperates with the T-shaped pusher rod 42, and the arc-shaped ejection groove 422 corresponds to and fits one-to-one with the suction head module 3. Pushing the ejection plate 421 can realize the synchronous disassembly of multiple suction heads without the need for manual removal one by one, which greatly improves the ejection efficiency. The snap-on connection design facilitates the disassembly and maintenance of the ejection module. The arc-shaped ejection groove 422 fits the contour of the suction head to avoid damage to the suction head or module interface during ejection, thus ensuring the service life of the components.

[0026] As a further preferred embodiment, the horizontal section of the T-shaped push rod 42 has an oblong hole 423. The housing 1 has a guide rod 13 fixed inside and a spring 14 mounted on its side. The guide rod 13 slides through the oblong hole 423 to guide and limit the T-shaped push rod 42. The spring 14 is horizontally arranged, with one end elastically abutting against the side end of the guide rod 13 and the other end elastically abutting against the inner wall of the T-shaped push rod 42, for resetting the ejection module 4.

[0027] Specifically, the guide rod 13 slides through the waist-shaped hole 423 to provide stable guidance and limit for the T-shaped push rod 42, avoiding deviation and jamming during the material ejection process, and ensuring that the multiple suction heads are evenly stressed and detach synchronously; the spring 14 can realize the automatic reset of the material ejection module without manual return, simplifying the operation steps, improving the continuity of liquid handling operations, and adapting to the needs of high-frequency liquid handling scenarios.

[0028] In a further preferred embodiment, the push rod assembly 22 includes a connecting cavity 221, a push rod 222, and a spring 223. The side end of the connecting cavity 221 is threadedly engaged with the internal threaded connection portion 2111 of the upper mounting section 211. The push rod 222 includes an upper push rod 2221 and a lower push rod 2222. The upper push rod 2221 is slidably assembled in the connecting cavity 221, and the lower push rod 2222 is correspondingly disposed inside the housing 1 and coaxial with the upper push rod 2221. The spring 223 is sleeved on the outside of the upper push rod 2221. The end of the upper push rod 2221 away from the lower push rod 2222 is fixed with a limiting seat 22211. The two ends of the spring 223 are elastically pressed against the side end of the limiting seat 22211 and the inner wall of the upper mounting section 211, respectively. The end of the lower push rod 2222 away from the upper push rod 2221 has multiple sets of mounting grooves 22221. The upper end of the suction head module 3 is embedded in the mounting grooves 22221 and fixed.

[0029] Specifically, the connecting cavity 221 is threadedly engaged with the internal threaded connecting part 2111, facilitating the disassembly and replacement of the push rod assembly; the upper push rod 2221 and the lower push rod 2222 are coaxially connected, and with the elastic buffer of the spring 223, the rigid impact during pipetting can be offset, reducing push rod movement error and improving pipetting accuracy; the limiting seat 22211 effectively limits the spring 223, preventing spring displacement and ensuring the stability and reliability of the push rod assembly operation.

[0030] As a further preferred embodiment, the pipette tip module 3 includes a piston rod 31 and a volume rod 32. One end of the piston rod 31 is fixedly connected to the lower push rod 2222 of the push rod module 2, and the other end slides through the volume rod 32. A piston ring 311 is fixedly provided at the end of the piston rod 31 located inside the volume rod 32. The piston ring 311 is sealed and fitted to the inner wall of the volume rod 32. The lower end of the volume rod 32 is inserted into the positioning hole 1221 and slides in fit. A spring 33 is sleeved on the outer side. An annular protrusion is integrally formed on the outer side of the volume rod 32. One end of the spring 33 abuts against the annular protrusion, and the other end elastically abuts against the inner wall of the upper cover plate 122. A pipette tip connection end is provided at the end of the volume rod 32 away from the piston rod 31. A sealing ring 321 is embedded in the outer wall of the pipette tip connection end to improve the sealing performance with the pipette tip.

[0031] Specifically, the sliding fit between the piston rod 31 and the volume rod 32, combined with the sealing design of the piston ring 311, ensures airtightness during pipetting, prevents liquid leakage, and improves pipetting accuracy. The spring 33 provides elastic support through the annular protrusion, allowing the volume rod 32 to have buffer adjustment space when the pipette tip is inserted, ensuring that multiple pipette tips fit together synchronously. The sealing ring 321 at the pipette tip connection end further enhances the sealing performance, adapts to different specifications of pipette tips, and broadens the applicability of the device.

[0032] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A pipetting section for a multichannel pipette, characterized in that, The device includes a housing, a push rod module, and a suction head module. The housing has a hollow structure with a lower meshing tooth integrally formed on the upper outer wall. The push rod module includes a push rod housing and a push rod assembly slidably assembled within the push rod housing. The push rod housing includes an upper mounting section and a lower mounting section coaxially connected. The upper mounting section has an internally threaded connection at its upper end and an upper meshing tooth integrally formed on its lower outer wall. The upper meshing tooth can mesh with the lower meshing tooth. The lower mounting section slides through the housing and has an annular positioning ring fixed at its end. A spring is sleeved on the outer side of the lower mounting section, and the two ends of the spring elastically abut against the lower end face of the upper mounting section and the upper end face of the housing, respectively. The suction head module is assembled inside the housing, with its upper end fixed to the lower end of the push rod assembly, for the purpose of liquid suction and discharge.

2. The pipetting section for a multichannel pipette according to claim 1, characterized in that, The housing is equipped with a positioning mechanism, which includes multiple sets of horizontally arranged partition plates and a top cover plate. The partition plates are spaced apart along the width of the housing to separate multiple suction head modules. The top cover plate has an L-shaped cross-section, with its horizontal section abutting the top of the partition plate and its vertical section having multiple sets of positioning holes for guiding and positioning the suction head modules.

3. The pipetting section for a multichannel pipette according to claim 1, characterized in that, It also includes a material ejection module, which includes a pusher ring and a T-shaped pusher rod. The pusher ring is slidably sleeved on the outside of the upper mounting section, and a connecting plate is integrally formed on its side end. The end of the T-shaped pusher rod near the pusher ring is connected to the connecting plate by a buckle, and the end away from the pusher ring is fixed with an ejection plate. The lower end of the ejection plate has multiple sets of arc-shaped ejection grooves, which correspond one-to-one with the suction head module and are sleeved on the outside of the suction head module.

4. The pipetting section for a multichannel pipette according to claim 3, characterized in that, The horizontal section of the T-shaped push rod has an oblong hole. A guide rod is fixed inside the housing and a second spring is assembled on its side. The guide rod slides through the oblong hole to guide and limit the T-shaped push rod. The second spring is horizontally arranged, with one end elastically abutting against the side end of the guide rod and the other end elastically abutting against the inner wall of the T-shaped push rod, for resetting the ejection module.

5. The pipetting section for a multichannel pipette according to claim 1, characterized in that, The push rod assembly includes a connecting cavity, a push rod, and a spring. The side end of the connecting cavity is threadedly engaged with the internal threaded connection part of the upper mounting section. The push rod includes an upper push rod and a lower push rod. The upper push rod is slidably assembled in the connecting cavity, and the lower push rod is correspondingly disposed inside the housing and coaxially connected with the upper push rod. The spring is sleeved on the outside of the upper push rod. A limiting seat is fixedly provided at the end of the upper push rod away from the lower push rod. The two ends of the spring are elastically abutted against the side end of the limiting seat and the inner wall of the upper mounting section, respectively. Multiple sets of mounting grooves are opened at the end of the lower push rod away from the upper push rod. The upper end of the suction head module is embedded in the mounting groove and fixed.

6. The pipetting section for a multichannel pipette according to claim 2, characterized in that, The suction head module includes a piston rod and a capacity rod. One end of the piston rod is fixedly connected to the lower push rod of the push rod module, and the other end slides through the inside of the capacity rod. A piston ring is fixedly provided at the end of the piston rod inside the capacity rod. The piston ring is sealed and fitted to the inner wall of the capacity rod. The lower end of the capacity rod is inserted into the positioning hole of the upper cover plate and slides in fit. A spring four is sleeved on the outer side. An annular protrusion is integrally formed on the outer side of the capacity rod. One end of the spring four abuts against the annular protrusion, and the other end elastically abuts against the inner wall of the upper cover plate.

7. A pipetting section for a multichannel pipette according to claim 6, characterized in that, The end of the volume rod away from the piston rod is provided with a pipette tip connection end, and a sealing ring is embedded in the outer wall of the pipette tip connection end to improve the sealing performance with the pipette tip.

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