Novel mini electric pipettor

Abstract

The utility model discloses a novel mini electric pipettor which comprises a shell, a lithium battery is arranged in the shell, and a pipetting assembly, a suction head withdrawing assembly and a main circuit board are arranged in the shell side by side in parallel. The pipetting assembly comprises a liquid sucking and discharging button, a liquid sucking and discharging circuit board, a driving motor, a motor guide sleeve, a motor screw rod, a piston rod, a piston cylinder and a piston cylinder fixing seat; the suction head withdrawing assembly comprises a suction head withdrawing button, a suction head withdrawing connecting rod and a suction head withdrawing outer cylinder. The internal structure of the pipettor is highly integrated, no redundant size exists except a core liquid suction and drainage structure, a gun withdrawing structure and a circuit structure, and the whole pipettor is small in size, light in weight and convenient to use by researchers; the pipettor is additionally provided with a suction head quitting judgment function, so that researchers can be reminded to quit the suction head after liquid suction and drainage, and cross contamination during pipetting is prevented; according to the pipettor, the sleeve spring, the piston barrel and the piston barrel fixing seat are matched, so that the uniform sealing force of the suction head of the pipettor every time is ensured, and the sealing stability is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of pipettes, in particular to a new type of mini electric pipette. Background Art

[0002] Pipettes are widely used in the field of life sciences, such as in industries like biology, pharmaceuticals, and diagnostics. In recent years, laboratory instruments and equipment have started to be digitally upgraded, and as the most commonly used instrument in biological experiments, intelligent pipettes have also entered the research and development and market launch stage.

[0003] Existing electric pipettes are large in volume and heavy in weight. After long-term use by researchers, it is easy to cause hand fatigue.

[0004] Moreover, during the pipetting process of hundreds or thousands of times by researchers, they often forget to remove the pipette tip, resulting in cross-contamination during pipetting.

[0005] In addition, due to different usage habits of researchers, the sealing force during the pressing of the pipette tip is not uniform, often causing the tip and the pipette to be unsealed, resulting in liquid leakage during the pipetting process and affecting the experimental accuracy. Content of the Utility Model

[0006] To solve the above technical problems, the utility model designs a new type of mini electric pipette.

[0007] The utility model adopts the following technical solutions:

[0008] A new type of mini electric pipette includes a housing. A lithium battery is arranged inside the housing. Inside the housing, a pipetting component, a tip ejection component, and a main circuit board are arranged in parallel and side by side. The pipetting component includes a suction and discharge button, a suction and discharge circuit board, a drive motor, a motor guide sleeve, a motor lead screw, a piston rod, a piston cylinder, and a piston cylinder fixing seat. The drive motor is driven by the lithium battery. The suction and discharge button, the suction and discharge circuit board, the drive motor, and the motor guide sleeve are installed on the housing. The suction and discharge circuit board is connected to the main circuit board. The suction and discharge button controls the forward and reverse rotation of the drive motor through the suction and discharge circuit board. The motor lead screw is threadedly connected to the piston rod. The drive motor drives the motor lead screw to rotate to drive the piston rod to move up and down inside the motor guide sleeve. The bottom of the piston rod is sleeved with a piston cylinder. A sealing ring is installed on the bottom of the piston rod. The piston cylinder is sleeved with a piston cylinder fixing seat. The piston cylinder fixing seat is installed on the housing. The piston cylinder moves up and down along the piston cylinder fixing seat. A sleeve retaining piece is arranged on the piston cylinder. A sleeve spring is installed between the sleeve retaining piece and the piston cylinder fixing seat. The bottom of the piston cylinder is used for installing the pipette tip.

[0009] The tip ejection component includes a tip ejection button, a tip ejection connecting rod, and a tip ejection outer cylinder that are fixedly connected in sequence. The tip ejection outer cylinder is sleeved outside the piston cylinder. The tip ejection button and the tip ejection outer cylinder are installed on the housing and realize partial lifting movement along the housing.

[0010] Preferably, a reset spring base is installed on the aspirator head connecting rod, and a gun withdrawal button return spring is sleeved outside the aspirator head connecting rod between the reset spring base and the housing.

[0011] Preferably, a magnet is fixedly installed on the aspirator head connecting rod, and a Hall sensor is installed on the main circuit board. The main circuit board judges whether the aspirator head has been withdrawn by sensing the change in magnetic flux through the Hall sensor.

[0012] Preferably, a photoelectric baffle is installed on the piston rod, and a photoelectric sensor is correspondingly installed on the main circuit board. The photoelectric baffle on the piston rod is located at the center of the photoelectric sensor, which is recorded as the pipetting zero position.

[0013] Preferably, a slider piece is installed on the piston rod, an internal chute of the guide sleeve is installed inside the motor guide sleeve, and the slider piece moves up and down along the internal chute of the guide sleeve.

[0014] Preferably, a sealing ring groove is provided on the piston rod, and the sealing ring groove is used for clamping the sealing ring.

[0015] Preferably, a screen and a circuit board on the back of the screen are installed on the housing. The circuit board on the back of the screen is connected to the main circuit board. Two range adjustment buttons are installed on the housing, and two range micro-touch switches are welded on the circuit board on the back of the screen. The range micro-touch switches are in contact with the corresponding range adjustment buttons.

[0016] Preferably, a motor shock pad is fixed on the upper part of the drive motor. The motor shock pad and the drive motor are fixedly installed on the housing together to provide a shock absorption function for the drive motor.

[0017] Preferably, a socket-type charging port is welded on the liquid suction and discharge circuit board, and a charging contact is welded on the main circuit board.

[0018] Preferably, the housing includes an upper shell and a lower shell, and the upper shell and the lower shell are connected by snap fit.

[0019] The beneficial effects of the present utility model are as follows: (1) The internal structure of this pipette is highly integrated. Except for the core liquid suction and discharge structure, gun withdrawal structure and circuit structure, there are no redundant dimensions. The whole machine is small in size and light in weight, which is convenient for researchers to use; (2) This pipette adds a function of judging the withdrawal of the aspirator head. After liquid suction and discharge, it will remind the researcher to withdraw the aspirator head to prevent cross-contamination during pipetting; (3) Through the cooperation between the sleeve spring, the piston cylinder and the piston cylinder fixing seat, this pipette ensures that the sealing force of each pipette aspirator head is uniform, ensuring the stability of the seal. Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the overall structure of the pipette;

[0021] Figure 2 It is a schematic diagram of the internal structure of a pipette;

[0022] Figure 3 It is a schematic diagram of a partial cross-section of the inside of the pipette Figure 1 ;

[0023] Figure 4 It is a schematic diagram of a partial cross-section of the inside of the pipette Figure 2 ;

[0024] The main technical feature reference numerals in the figure are: 11, range adjustment button; 12, screen; 13, upper shell; 14, tip ejection outer cylinder; 15, tip; 16, lower shell; 17, aspiration and discharge button; 171, button buckle; 18, tip ejection button; 19, magnet; 20, lithium battery; 21, tip ejection connecting rod; 211, reset spring base; 22, main circuit board; 221, Hall sensor; 222, photoelectric sensor; 223, charging contact; 23, trigger button return spring; 24, piston barrel fixing seat; 241, guide groove; 242, fixing insert; 25, motor guide sleeve; 251, internal sliding groove of the guide sleeve; 252, fixing screw hole of the guide sleeve; 253, motor fixing groove of the guide sleeve; 26, drive motor; 261, motor lead screw; 27, motor shock pad; 28, aspiration and discharge circuit board; 281, socket-type charging port; 282, button slot; 283, aspiration and discharge micro switch; 29, piston rod; 291, photoelectric baffle; 292, slider piece; 293, sealing ring slot; 30, sealing ring; 31, piston barrel; 311, tip fixing seat; 312, sleeve baffle; 32, sleeve spring; 33, circuit board on the back of the screen; 331, range micro switch. Specific embodiments

[0025] The technical solutions of the present invention will be further specifically described below through specific embodiments and in conjunction with the drawings:

[0026] Embodiment: As Figures 1-4 shown, a new type of mini electric pipette includes a housing, the housing is divided into a lower shell 13 and an upper shell 16, and a pipetting assembly, a tip ejection assembly, a main circuit board 22 and a lithium battery 20 are sequentially arranged in parallel and side by side on the lower shell 16;

[0027] The pipetting assembly includes a liquid suction and discharge button 17, a liquid suction and discharge circuit board 28, a driving motor 26, a motor guide sleeve 25, a motor lead screw 261, a piston rod 29, a piston cylinder 31, and a piston cylinder fixing seat 24; the driving motor 26 is driven by a lithium battery 20. The liquid suction and discharge button 17 and the liquid suction and discharge circuit board 28 are installed on the lower housing 16. A button buckle 171 is installed on the liquid suction and discharge button 17, and a button slot 282 is correspondingly provided on the liquid suction and discharge circuit board 28. A liquid suction and discharge micro-touch switch 283 is installed between the liquid suction and discharge button 17 and the liquid suction and discharge circuit board 28. The liquid suction and discharge button 17 is fixedly connected to the liquid suction and discharge circuit board 28 through the button buckle 171. The driving motor 26 is fixed to the motor guide sleeve 25 through a motor shock pad 27 on the lower housing 16. The piston cylinder 31 is fixed to the lower housing through the piston cylinder fixing seat 24. The liquid suction and discharge circuit board 28 is connected to the main circuit board 22. The liquid suction and discharge button 17 controls the forward and reverse rotation of the driving motor 26 through the liquid suction and discharge circuit board 28. The motor lead screw 261 is threadedly connected to the piston rod 29. The driving motor 26 drives the motor lead screw 261 to rotate to drive the piston rod 29 to lift and lower along the motor guide sleeve 25. The bottom of the piston rod 29 is externally sleeved with a piston cylinder 31. A sealing ring 30 is installed on the bottom of the piston rod 29. The piston cylinder 31 is externally sleeved with a piston cylinder fixing seat 24. The piston cylinder 31 fixing seat is installed on the lower housing 16 through a fixing insert 242. The piston cylinder 31 moves up and down along the piston cylinder fixing seat. A sleeve stop piece 312 is provided on the piston cylinder 31. A sleeve spring 32 is installed between the sleeve stop piece 312 and the piston cylinder fixing seat 24. The bottom of the piston cylinder 31 is used to install a pipette tip 15. The sealing ring 30 on the piston rod 29 is sealed with the inner wall of the piston cylinder 31. The pipette tip 15 is sealed with the pipette tip fixing seat 311, and a sealed cavity is formed between the two;

[0028] The pipette tip withdrawing assembly includes a pipette tip withdrawing button 18, a pipette tip withdrawing connecting rod 21, and a pipette tip withdrawing outer cylinder 14 that are fixedly connected in sequence. The pipette tip withdrawing outer cylinder 14 is sleeved outside the piston cylinder 31. The pipette tip withdrawing button 18 and the pipette tip withdrawing outer cylinder 14 are installed on the lower housing 16 and perform partial lifting activities along the housing. A return spring base 211 is installed on the pipette tip withdrawing connecting rod 21. A pipette gun button return spring 23 is sleeved outside the pipette tip withdrawing connecting rod 21 between the return spring base 211 and the housing.

[0029] A magnet 19 is fixedly installed on the pipette tip withdrawing connecting rod 21. A Hall sensor 221 is installed on the main circuit board 22. The main circuit board 22 judges whether the pipette tip 15 has been withdrawn by sensing the change in magnetic flux through the Hall sensor 221.

[0030] A photoelectric blocking piece 291 is installed on the piston rod 29. A photoelectric sensor 222 is correspondingly installed on the main circuit board 22. The photoelectric blocking piece 291 on the piston rod 29 is located at the center of the photoelectric sensor 222, which is recorded as the pipetting zero position.

[0031] A slider piece 292 is installed on the piston rod 29, and an internal chute 251 of the guide sleeve is installed inside the motor guide sleeve 25. The slider piece 292 moves up and down along the internal chute 251 of the guide sleeve. The motor guide sleeve is provided with a guide sleeve fixing screw hole 252 and a guide sleeve motor fixing groove 253 for connecting the lower housing 16 and the drive motor 26.

[0032] A sealing ring clamping groove 293 is provided on the piston rod 29, and the sealing ring clamping groove 293 is used for clamping the sealing ring 30.

[0033] A screen 12 and a circuit board 33 on the back of the screen are installed on the upper housing 13. The circuit board 33 on the back of the screen is connected to the main circuit board 22. Two range adjustment buttons 11 are installed on the upper housing 13. Two range micro-touch switches 331 are soldered on the circuit board 33 on the back of the screen, and the range micro-touch switches 331 are in contact with the corresponding range adjustment buttons 11.

[0034] An upper part of the drive motor 28 is fixed with a motor shock pad 27. The motor shock pad 27 and the drive motor 26 are fixedly installed on the lower housing 16 together to provide a shock absorption function for the drive motor.

[0035] A socket-type charging port 281 is soldered on the liquid suction and discharge circuit board 28, and a charging contact 223 is soldered on the main circuit board 22.

[0036] The working principle of the present utility model is as follows:

[0037] I. Realize the function of liquid suction and discharge of the pipette: When sucking liquid, the finger presses the liquid suction and discharge button 17, and the motor lead screw 261 starts to rotate forward. The slider piece 292 cooperates with the internal chute 251 of the guide sleeve to realize the linear motion of the piston rod. The sealing ring 30 moves upward to realize the liquid suction function. Similarly, when the liquid suction and discharge button 17 is pressed again, the motor lead screw 261 rotates reversely to realize the liquid discharge function.

[0038] II. Realize the function of pipette tip ejection: When ejecting the tip, the finger presses the tip ejection button 18, driving the outer barrel 14 of the tip ejection downward. The bottom of the outer barrel 14 of the tip ejection pushes out the tip 15.

[0039] III. Realize the function of resetting the tip ejection button: When ejecting the tip, the reset spring 23 of the gun ejection button is in a compressed state. After releasing the hand, the reset spring 23 of the gun ejection button abuts against the reset spring base 211, driving the tip ejection button 18 to move upward to the starting position to complete the reset of the tip button 18.

[0040] IV. Realize the function of pipette range adjustment: When adjusting the range, the finger presses the range adjustment button 11, and the range micro-touch switch 331 transmits a signal to the main board program to control the number of rotation turns of the motor lead screw 261 during liquid suction and discharge, so as to realize the liquid suction and discharge functions of different ranges.

[0041] V. Implement the function of judging the withdrawal of the pipette tip: When the pipette tip is withdrawn, the tip withdrawal connecting rod 22 drives the magnet 19 to move downward, and the magnetic flux sensed by the Hall sensor 221 changes, determining that the pipette tip 15 has been withdrawn.

[0042] VI. Implement the function of ensuring uniform and stable sealing force of the pipette tip: When inserting the pipette tip, the tip fixing seat 311 presses the pipette tip 15, the piston barrel 31 moves upward, the sleeve retaining piece 312 presses the sleeve spring 32, and moves upward a fixed distance along the guide groove 241. The compression amount of the sleeve spring 32 is consistent with the fixed moving distance of the guide groove 241, ensuring uniform and stable sealing force of the pipette tip each time and preventing liquid leakage of the pipette.

[0043] VII. Implement the function of multiple charging methods for the pipette: A socket-type charging port 281 is welded on the liquid suction and discharge circuit board 28 to provide wired charging function. Charging contacts 223 are welded on the main circuit board 22 to provide magnetic charging function.

[0044] VIII. Implement the function of damping the pipette motor: The upper part of the drive motor 26 is fixed with a motor damping pad 27, made of rubber, and is fixed on the lower shell 16 together with the drive motor 26, providing damping function for the drive motor 27 and improving the pipetting accuracy of the pipette.

[0045] IX. Implement the function of making the whole machine mini and portable: The internal space layout of the pipette is compact, and the internal structure is highly integrated. Except for the core liquid suction and discharge structure, gun withdrawal structure and circuit structure, there are no redundant dimensions. The whole machine is small in size and light in weight. Its thickness is only the diameter of the drive motor 26, plus the thickness of the upper shell 13 and the lower shell 16, without redundant gaps; its height is less than the height of the palm and can be easily placed in the palm.

[0046] The embodiments described above are only a preferred solution of the present utility model, and do not impose any form of limitation on the present utility model. There are other variations and modifications without exceeding the technical solutions recorded in the claims.

Claims

1. A novel mini electric pipette, comprising a housing, and a lithium battery is arranged inside the housing. It is characterized in that, Inside the housing, a pipetting assembly, a tip retraction assembly, and a main circuit board are arranged in parallel and side by side. The pipetting assembly includes a suction / discharge button, a suction / discharge circuit board, a drive motor, a motor guide sleeve, a motor lead screw, a piston rod, a piston cylinder, and a piston cylinder fixing seat; The drive motor is driven by a lithium battery. The suction / discharge button, the suction / discharge circuit board, the drive motor, and the motor guide sleeve are installed on the housing. The suction / discharge circuit board is connected to the main circuit board. The suction / discharge button controls the forward and reverse rotation of the drive motor through the suction / discharge circuit board. The motor lead screw is threadedly connected to the piston rod. The drive motor drives the motor lead screw to rotate to drive the piston rod to move up and down inside the motor guide sleeve. The bottom of the piston rod is sleeved with a piston cylinder. A sealing ring is installed on the bottom of the piston rod. The piston cylinder is sleeved with a piston cylinder fixing seat. The piston cylinder fixing seat is installed on the housing. The piston cylinder moves up and down along the piston cylinder fixing seat. A sleeve stop piece is arranged on the piston cylinder. A sleeve spring is installed between the sleeve stop piece and the piston cylinder fixing seat. The bottom of the piston cylinder is a tip fixing seat for installing a tip; The tip retraction assembly includes a tip retraction button, a tip retraction link, and a tip retraction outer cylinder that are fixedly connected in sequence. The tip retraction outer cylinder is sleeved outside the piston cylinder. The tip retraction button and the tip retraction outer cylinder are installed on the housing and realize partial lifting movement along the housing.

2. The novel mini electric pipette according to claim 1, characterized in that, A reset spring base is installed on the tip retraction link. A gun retraction button reset spring is sleeved between the tip retraction link and the housing outside the reset spring base.

3. A novel mini electric pipette according to claim 1, characterized in that, A magnet is fixedly installed on the tip retraction link. A Hall sensor is installed on the main circuit board. The main circuit board judges whether the tip has been retracted by sensing the change in magnetic flux through the Hall sensor.

4. A novel mini electric pipette according to claim 1, characterized in that, A photoelectric stop piece is installed on the piston rod. A photoelectric sensor is correspondingly installed on the main circuit board. The photoelectric stop piece on the piston rod is located at the center of the photoelectric sensor, which is recorded as the pipetting zero position.

5. A novel mini electric pipette according to claim 1, characterized in that, A slider piece is installed on the piston rod. An inner guide sleeve chute is installed inside the motor guide sleeve. The slider piece moves up and down along the inner guide sleeve chute.

6. A novel mini electric pipette according to claim 1, characterized in that, A sealing ring groove is arranged on the piston rod. The sealing ring groove is used for clamping a sealing ring.

7. A novel mini electric pipette according to claim 1, characterized in that, A screen and a screen back circuit board are installed on the housing. The screen back circuit board is connected to the main circuit board. A range adjustment button is installed on the housing. Two range micro-touch switches are welded on the screen back circuit board. The range micro-touch switches are in contact with the corresponding range adjustment buttons.

8. A novel mini electric pipette according to claim 1, characterized in that, An electric motor shock pad is fixed on the upper part of the drive motor. The electric motor shock pad and the drive motor are fixed and installed on the housing together to provide a shock-absorbing function for the drive motor.

9. A novel mini electric pipette according to claim 1, characterized in that, A socket-type charging port is welded on the suction / discharge circuit board. Charging contacts are welded on the main circuit board.

10. A novel mini electric pipette according to claim 1, characterized in that, The housing includes an upper shell and a lower shell. The upper shell and the lower shell are connected by snap fit.

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