Handheld multichannel pipettor

Abstract

The utility model relates to a handheld multichannel pipettor which comprises a handle and a lower shell assembly, a pressing piece is arranged on the handle, a pipetting mechanism is arranged in the lower shell assembly, the lower shell assembly comprises a front shell and a rear shell, a connecting mechanism is arranged on the rear shell, the connecting mechanism comprises a connecting pipe and a sleeve, the sleeve is in threaded connection with the handle, and the connecting pipe is in threaded connection with the handle. The connecting pipe is installed in the sleeve in a sliding mode and connected with the sleeve in a clamped mode. A pressing block is arranged on the handle. During installation, the pressing block slides to be staggered from the position of the sleeve, the connecting pipe slides to the inner side of the sleeve to be clamped, the pressing block is loosened to slide to the outer side of the sleeve, the position between the connecting pipe and the sleeve is fixed, and the lower shell assembly and the handle are well installed. And at the moment, the connecting pipe and the sleeve are detached and then pulled out, the lower shell assembly and the handle are separated, and the effect that the lower shell part is convenient to install and detach is achieved.

Description

Technical Field

[0001] The present application relates to the field of pipettes, and in particular to a handheld multi-channel pipette. Background Art

[0002] A multichannel pipette is a measuring tool that transfers liquid from one container to another, allowing the user to operate multiple samples at one time, thus greatly improving experimental efficiency.

[0003] A multichannel pipette usually includes a handle and a lower shell part. The lower shell part is provided with a piston and a sleeve. The pipetting volume is set using an adjustment knob during operation. After assembling the tip, the handle is pressed to expel some air through the piston, the liquid is sucked in using atmospheric pressure, and the piston then pushes the air to expel the liquid.

[0004] Usually, in order to ensure the normal use of the multi-channel pipette, the pipette needs to be maintained and repaired. However, the connection structure between the lower shell and the handle of the multi-channel pipette is complicated, which makes the disassembly and assembly process cumbersome, and the parts of the pipette are easily damaged during manual disassembly and assembly. Utility Model Content

[0005] In order to solve the problem that the connection structure between the lower shell and the handle of the multi-channel pipette is complicated, and the parts of the pipette are easily damaged during manual disassembly and assembly, the present application provides a handheld multi-channel pipette.

[0006] The present application provides a handheld multi-channel pipette adopts the following technical solution:

[0007] A handheld multi-channel pipette comprises a handle and a lower shell assembly, the handle is provided with a pressing piece, a pipetting mechanism is provided in the lower shell assembly, the lower shell assembly comprises a front shell and a rear shell, the front shell and the rear shell are detachably connected, a connecting mechanism is provided on the rear shell, the connecting mechanism comprises a connecting tube and a sleeve, the sleeve is threadedly connected to the handle, the connecting tube is slidably installed in the sleeve and the connecting tube and the sleeve are clamped, the handle is located on one side of the pressing piece and a pressing block is slidably installed, and the pressing block is located outside the sleeve.

[0008] By adopting the above technical scheme, the sleeve and the handle are threadedly connected. During installation, the pressing piece is pressed to slide the pressing block to a position offset from the sleeve. At this time, the connecting tube is pushed to the inner side of the sleeve to engage, and then the pressing block is released. At this time, the pressing block slides to the outside of the sleeve, and the position between the connecting tube and the sleeve is fixed. Then, the lower shell assembly and the handle are installed. When disassembly is required, the pressing block is pushed to a position offset from the sleeve. At this time, the connecting tube and the sleeve are disassembled and pulled out, the lower shell assembly is separated from the handle, and the front shell and the rear shell are opened. The installation and disassembly operations of the lower shell part are relatively convenient.

[0009] Optionally, a plurality of clamping blocks are provided on the sleeve, the clamping blocks are arranged in an arc shape, and the plurality of clamping blocks form a ring shape. A clamping strip is provided at the clamping block, and a limiting circular groove for clamping the clamping strip is provided on the connecting pipe.

[0010] By adopting the above technical solution, when the connecting tube is inserted into the sleeve, the connecting tube is located on the inner side of the clamping block. When the connecting tube moves to the position where the limiting circular groove is located at the clamping strip, the clamping strip clamps the limiting circular groove to fix the connecting tube and the sleeve, and the clamping operation is more convenient.

[0011] Optionally, an elastic ring is sleeved on the outer side of the clamping block.

[0012] By adopting the above technical solution, the elastic ring presses the clamping block against the connecting pipe, the abutting effect is better, and the connecting pipe and the sleeve are not easy to slip and dislocate.

[0013] Optionally, a limiting ring is sleeved on the outer side of the connecting tube, one end of the limiting ring abuts against one end of the sleeve, and the end of the limiting ring facing away from the sleeve abuts against one side of the rear shell.

[0014] By adopting the above technical solution, when the connecting tube and the sleeve are clamped together, the limiting ring is located between the connecting tube and the rear shell, which reduces the shaking of the connecting tube and limits the contact between the sleeve and the rear shell on the upper and lower sides.

[0015] Optionally, the front shell is slidably connected to the rear shell, a first buckle is provided on the front shell, a second buckle for the first buckle to be clamped is provided on the rear shell, and the front shell and the rear shell are fastened and fixed by screws.

[0016] By adopting the above technical solution, when installing, the front shell is slid along the rear shell until the first buckle is locked at the second buckle, and then it is locked and fixed by screws, so the installation and disassembly operations are more convenient.

[0017] Optionally, the pipetting mechanism includes a piston rod and a nozzle, the handle is provided with an ejection piece, the piston rod is connected to the ejection piece, the nozzle is arranged at the rear shell, the piston rod is slidingly connected to the nozzle, and the rear shell is located on the outside of the nozzle and is provided with a spring.

[0018] By adopting the above technical solution, the ejector pushes the piston rod to slide at the nozzle to suck and discharge liquid. When the suction head is pressed onto the nozzle, the nozzle is pushed to move. At this time, the spring elastically adjusts the nozzle to reduce the probability of damage between the nozzle and the piston rod after the nozzle is subjected to pressure.

[0019] Optionally, an ejector is slidably mounted at the front shell, the downward side of the ejector is located at the nozzle, a top block is provided on the ejector, and one side of the top block abuts against the pressing block.

[0020] By adopting the above technical solution, when the suction head on the nozzle needs to be pushed out, the pressing piece pushes the pressing block, and the pressing block pushes the ejector through the top block to push the suction head on the lower side of the nozzle out, making the operation of removing the suction head more convenient.

[0021] Optionally, a tension spring is provided at the rear shell, and one end of the tension spring is connected to the ejector.

[0022] By adopting the above technical solution, when the ejector is pushed, the tension spring is stretched, and when released, the tension spring pulls the ejector to reset, which is not easy to affect the suction and discharge operations.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. During installation, the pressing piece presses the pressing block to slide to a position offset from the sleeve, slides the connecting tube to the inner side of the sleeve for clamping, and then releases the pressing block. At this time, the pressing block slides to the outer side of the sleeve, and the position between the connecting tube and the sleeve is fixed, and then the lower shell assembly and the handle are installed. When disassembly is required, the pressing block is pushed to a position offset from the sleeve, and then the connecting tube and the sleeve are disassembled and pulled out, the lower shell assembly is separated from the handle, and the front shell and the rear shell are opened. The installation and disassembly of the lower shell part are relatively convenient;

[0025] 2. The elastic ring presses the clamping block against the connecting pipe, which has a good contact effect and prevents the connecting pipe and the sleeve from slipping or misaligning.

[0026] 3. The spring adjusts the elasticity of the nozzle to reduce the probability of damage between the nozzle and the piston rod after the nozzle is under pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional structural schematic diagram of this application.

[0028] Figure 2 It is a cross-sectional view of the side position of the lower shell component of the present application along the vertical direction.

[0029] Figure 3 It is a schematic diagram of the three-dimensional structure of the liquid transfer mechanism inside the rear shell of the present application.

[0030] Figure 4 It is a cross-sectional view of the connection mechanism of the present application along the vertical direction.

[0031] Figure 5 It is an enlarged cross-sectional view of part A of the present application.

[0032] Those skilled in the art will appreciate that the elements in the drawings are shown for simplicity and clarity and are not necessarily drawn to scale. For example, the size and position of some elements in the drawings may be magnified relative to other elements to help improve understanding of the embodiments of the present invention.

[0033] Figure numerals: 1. handle; 11. pressing piece; 12. ejector; 13. pressing block; 2. lower shell assembly; 21. front shell; 211. first buckle; 22. rear shell; 221. second buckle; 222. spring; 223. support plate; 224. tension spring; 3. connecting mechanism; 31. connecting tube; 311. limiting circular groove; 312. elastic ring; 32. sleeve; 321. clamping block; 322. clamping strip; 323. arc-shaped embedded groove; 33. limiting ring; 4. pipetting mechanism; 41. piston rod; 42. nozzle; 5. ejector; 51. top block. DETAILED DESCRIPTION

[0034] The present application is further described in detail below in conjunction with the accompanying drawings.

[0035] The present application embodiment discloses a handheld multi-channel pipette, referring to Figure 1 and Figure 2 , including a handle 1 and a lower shell assembly 2, the handle 1 is provided with a pressing member 11 and an ejecting member 12, the lower shell assembly 2 includes a front shell 21 and a rear shell 22, the front shell 21 and the rear shell 22 are detachably connected, the rear shell 22 is provided with a connecting mechanism 3, and the rear shell 22 is connected to the handle 1 through the connecting mechanism 3.

[0036] Reference Figure 1 and Figure 3 A pipetting mechanism 4 is provided at the rear shell 22, and the pipetting mechanism 4 includes a piston rod 41 and a nozzle 42. The piston rod 41 is connected to the ejection member 12, and the nozzle 42 is provided at the rear shell 22 and one end of the nozzle 42 is located outside the rear shell 22. The piston rod 41 is slidably connected to the nozzle 42. When working, the suction head is pressed against the nozzle 42, and the piston rod 41 is driven by the ejection member 12 to move to suck and discharge liquid.

[0037] Reference Figure 1 and Figure 3 A pressing block 13 is provided on the handle 1 at the lower side of the pressing member 11, and the pressing block 13 is slidably connected to the handle 1. An ejector 5 is slidably installed at the front shell 21, and the downward side of the ejector 5 is located at the nozzle 42. A top block 51 is provided on the upward side of the ejector 5, and the upward side of the top block 51 abuts against the downward side of the pressing block 13. When the suction head needs to be removed from the nozzle 42, the pressing member 11 is pushed to drive the pressing block 13 to slide, and the pressing block 13 pushes the ejector 5 through the top block 51 to remove the suction head on the lower side of the nozzle 42 from the nozzle 42.

[0038] Reference Figure 4 and Figure 5 The connecting mechanism 3 includes a connecting tube 31 and a sleeve 32. The sleeve 32 is threadedly connected to the handle 1 at an upper portion. The connecting tube 31 is slidably installed in the sleeve 32. The pressing block 13 is located outside the sleeve 32 and is slidably connected to the sleeve 32. The sleeve 32 is provided with four clamping blocks 321 at a downward section, and the clamping blocks 321 are arranged in an arc shape. The four clamping blocks 321 are surrounded by a ring. The clamping block 321 is provided with a clamping strip 322 on one side facing the connecting tube 31. The clamping strip 322 is arranged in an arc shape and horizontally. A limited circular groove 311 is provided on the connecting tube 31. When installing, the pressing piece 11 is pressed to slide the pressing block 13 to be offset from the position of the sleeve 32, and the connecting tube 31 is inserted into the sleeve 32. The connecting tube 31 is located on the inner side of the clamping block 321. When the connecting tube 31 moves to the limiting circular groove 311 at the clamping strip 322, the clamping strip 322 clamps the limiting circular groove 311 to fix the connecting tube 31 and the sleeve 32, and the pressing block 13 is released. At this time, the pressing block 13 slides to the outside of the sleeve 32.

[0039] Reference Figure 5 The clamping block 321 is located at a side wall away from the connecting tube 31 and is provided with an arc-shaped embedding groove 323 at a position opposite to the clamping strip 322. The clamping block 321 is provided with an elastic ring 312 at the arc-shaped embedding groove 323, and the elastic ring 312 presses the clamping block 321 against the connecting tube 31.

[0040] Reference Figure 4 A limiting ring 33 is sleeved on the outer side of the connecting tube 31, and the limiting ring 33 is abutted and clamped with the front shell 21 and the rear shell 22 on the downward side, and the limiting ring 33 is abutted and clamped with the clamping block 321 of the sleeve 32 on the upward side. When the connecting tube 31 and the sleeve 32 are clamped, the limiting ring 33 is located between the connecting tube 31 and the rear shell 22, reducing the shaking of the connecting tube 31 and abutting and limiting the sleeve 32 and the rear shell 22 on the upper and lower sides.

[0041] Reference Figure 2 The front shell 21 and the rear shell 22 are slidingly connected, a first buckle 211 is provided on the front shell 21, and a second buckle 221 is provided at the rear shell 22. The front shell 21 and the rear shell 22 are fastened and fixed by screws. When installing, the front shell 21 is slid along the rear shell 22 until the first buckle 211 is fastened at the second buckle 221, and then fastened and fixed by screws.

[0042] Reference Figure 3A spring 222 is provided on the outside of the nozzle 42 of the rear shell 22, and a support plate 223 is provided on the nozzle 42 of the rear shell 22. The spring 222 is connected to the support plate 223, and one end of the spring 222 away from the support plate 223 is connected to the nozzle 42. When the suction head is pressed onto the nozzle 42, the nozzle 42 is pushed to move. At this time, the spring 222 elastically adjusts the position of the nozzle 42 to reduce the probability of damage between the nozzle 42 and the piston rod 41 after the nozzle 42 is subjected to pressure.

[0043] Reference Figure 1 A tension spring 224 is provided at the rear shell 22, and one end of the tension spring 224 is connected to the ejector 5. When the ejector 5 is pushed, the tension spring 224 is stretched. When released, the tension spring 224 pulls the ejector 5 to reset, which is not easy to affect the suction and discharge operations.

[0044] The implementation principle of a handheld multi-channel pipette in the embodiment of the present application is as follows: one end of the sleeve 32 is threadedly connected to the handle 1. During installation, the pressing piece 11 is pressed to slide the pressing block 13 to a position offset from the sleeve 32. At this time, the connecting tube 31 is pushed to the inner side of the sleeve 32 to engage, and then the pressing block 13 is released. At this time, the pressing block 13 slides to the outside of the sleeve 32, and the position between the connecting tube 31 and the sleeve 32 is fixed, and then the lower shell assembly 2 and the handle 1 are installed. When disassembly is required, the pressing block 13 is pushed to a position offset from the sleeve 32. At this time, the connecting tube 31 and the sleeve 32 are disassembled and pulled out, the lower shell assembly 2 is separated from the handle 1, and the front shell 21 and the rear shell 22 are opened for inspection and maintenance.

[0045] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A handheld multichannel pipette, comprising a handle (1) and a lower shell component (2), wherein the handle (1) is provided with a pressing member (11), and the lower shell component (2) is provided with a pipetting mechanism (4), characterized in that: The lower shell assembly (2) comprises a front shell (21) and a rear shell (22), the front shell (21) and the rear shell (22) being detachably connected, the rear shell (22) being provided with a connecting mechanism (3), the connecting mechanism (3) comprising a connecting tube (31) and a sleeve (32), the sleeve (32) being threadedly connected to the handle (1), the connecting tube (31) being slidably mounted in the sleeve (32) and the connecting tube (31) and the sleeve (32) being clamped together, the handle (1) being slidably mounted with a pressing block (13) on one side of the pressing member (11), the pressing block (13) being located outside the sleeve (32).

2. A handheld multichannel pipette according to claim 1, characterized in that: The sleeve (32) is provided with a plurality of clamping blocks (321), the clamping blocks (321) are arranged in an arc shape, and the plurality of clamping blocks (321) form a ring shape. The clamping blocks (321) are provided with clamping strips (322), and the connecting tube (31) is provided with a limiting circular groove (311) for clamping the clamping strips (322).

3. A handheld multichannel pipette according to claim 2, characterized in that: An elastic ring (312) is sleeved on the outer side of the clamping block (321).

4. A handheld multichannel pipette according to claim 1, characterized in that: A limiting ring (33) is sleeved on the outside of the connecting tube (31), one end of the limiting ring (33) abuts against one end of the sleeve (32), and the end of the limiting ring (33) facing away from the sleeve (32) abuts against one side of the rear shell (22).

5. A handheld multichannel pipette according to claim 1, characterized in that: The front shell (21) is slidably connected to the rear shell (22); a first buckle (211) is provided on the front shell (21); a second buckle (221) for the first buckle (211) to be buckled is provided on the rear shell (22); and the front shell (21) and the rear shell (22) are fixed by screws.

6. A handheld multichannel pipette according to claim 1, characterized in that: The pipetting mechanism (4) comprises a piston rod (41) and a nozzle (42); the handle (1) is provided with a push-out member (12); the piston rod (41) is connected to the push-out member (12); the nozzle (42) is arranged at the rear shell (22); the piston rod (41) and the nozzle (42) are slidably connected; the rear shell (22) is provided with a spring (222) on the outside of the nozzle (42).

7. A handheld multichannel pipette according to claim 6, characterized in that: An ejector (5) is slidably mounted on the front shell (21), the downward side of the ejector (5) being located at the nozzle (42), and a top block (51) is provided on the ejector (5), one side of the top block (51) being in contact with the pressing block (13).

8. A handheld multi-channel pipette according to claim 7, characterized in that: The rear shell (22) is provided with a tension spring (224), and one end of the tension spring (224) is connected to the ejector (5).

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